CN106915809B - Formula, preparation method and use method of heavy medium powder for water treatment - Google Patents
Formula, preparation method and use method of heavy medium powder for water treatment Download PDFInfo
- Publication number
- CN106915809B CN106915809B CN201710223746.2A CN201710223746A CN106915809B CN 106915809 B CN106915809 B CN 106915809B CN 201710223746 A CN201710223746 A CN 201710223746A CN 106915809 B CN106915809 B CN 106915809B
- Authority
- CN
- China
- Prior art keywords
- medium powder
- tank
- powder
- water
- dense medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000843 powder Substances 0.000 title claims abstract description 133
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 238000005189 flocculation Methods 0.000 claims abstract description 69
- 230000016615 flocculation Effects 0.000 claims abstract description 69
- 238000004062 sedimentation Methods 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 26
- 238000000227 grinding Methods 0.000 claims abstract description 22
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 16
- 239000004615 ingredient Substances 0.000 claims abstract description 15
- 239000012528 membrane Substances 0.000 claims abstract description 14
- 238000012216 screening Methods 0.000 claims abstract description 13
- 238000007885 magnetic separation Methods 0.000 claims abstract description 12
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims abstract description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 9
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 235000020188 drinking water Nutrition 0.000 claims abstract description 6
- 239000003651 drinking water Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 37
- 239000000701 coagulant Substances 0.000 claims description 36
- 238000003756 stirring Methods 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 28
- 239000010802 sludge Substances 0.000 claims description 18
- 239000012535 impurity Substances 0.000 claims description 15
- 239000011265 semifinished product Substances 0.000 claims description 15
- 238000004064 recycling Methods 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 10
- 230000003179 granulation Effects 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000009837 dry grinding Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 239000012153 distilled water Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 239000006148 magnetic separator Substances 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000011164 primary particle Substances 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 20
- 239000008399 tap water Substances 0.000 abstract description 11
- 235000020679 tap water Nutrition 0.000 abstract description 11
- 239000010865 sewage Substances 0.000 abstract description 8
- 238000001556 precipitation Methods 0.000 description 9
- 230000001112 coagulating effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000011084 recovery Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 230000035622 drinking Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a formula of dense medium powder for water treatment, which comprises the following main substances and ingredients:the main substance being Fe 3 O 4 Accounting for 85-99.5 percent of the total mass; the ingredients comprise MnO and SiO 2 、ZnO、TiO 2 、CuO、Al 2 O 3 、CaO、MgO、Bi 2 O 3 One or more of; also discloses a preparation method of the dense medium powder for water treatment, which comprises the following steps: weighing raw materials, grinding, primary magnetic separation, drying, roasting, screening and secondary magnetic separation to produce a finished product of heavy medium powder; the raw water to be treated flows through a mixing tank, a primary flocculation tank, a flocculation reaction tank, a sedimentation tank and an ultrafiltration membrane tank in sequence and then is discharged; the produced dense medium powder is suitable for treatment of tap water and sewage, has higher density than micro-sand, is easier to recycle, has less influence on subsequent procedures, and can reduce investment cost and improve the treatment efficiency of the drinking water.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to the field of physical and chemical treatment of sewage treatment and tap water treatment, and specifically relates to a formula, a preparation method and a use method of dense medium powder for water treatment.
Background
In recent years, as the water environment pollution situation in various regions becomes more and more serious, the requirements of the public on the water treatment technology and the effect thereof are increasingly improved. Whether a newly built sewage treatment plant or a tap water plant or whether the existing sewage treatment plant or tap water plant is subjected to upgrading and reconstruction, efficient and compact new technology and new process are needed.
Coagulating sedimentation is a widely applied process method in the field of water treatment. The process adopts a method of adding a medicament (coagulant/coagulant aid) with coagulation capacity into raw water to be treated, and impurities or pollutants such as fine suspended particles, colloid particles and the like in the water form floccules and precipitate through the mechanism action such as adsorption and bridging, so that the water purification effect is achieved.
Patent No. 201180030555.5 proposes a method for treating water by performing ballasted flocculation of a natural flocculant, and micro sand with the particle size of 60-300 microns is selected to participate in ballasted flocculation so as to improve flocculation efficiency. The density of the micro sand is about 2.5g/cm 3 Although the density of the sand-containing floc is higher than that of water, the density of the sand-containing floc is not enough, and the fine sand-containing floc can not be completely precipitated in the actual production process, namely, the fine sand-containing floc floats to the next procedure along with water flow, which is commonly called as 'sand running', so that the pipeline blockage, the damage of a water pump impeller, the damage of an ultrafiltration membrane wire and the like in the next procedure are not influenced.
The heavy medium coagulating sedimentation process is a very fast coagulating sedimentation technology (patent numbers: 201620549866.2, 201520658253.8 and the like) which is developed recently and developed on the basis of the traditional water treatment process, wherein while a conventional coagulant and/or a flocculant is added into water, micron-sized inert high-density soft magnetic heavy medium particles are added as flocculating nuclei to quickly form high-concentration and high-density composite flocs under the condition of better hydraulic power, and the composite flocs can finish the sedimentation process in a very short time and quickly purify a water body. In order to reduce the operation cost of a water treatment system and reduce the influence of heavy medium powder on the subsequent water treatment process, the heavy medium coagulating sedimentation process comprises the steps of carrying out flocculation decomposition on flocs through a heavy medium powder floc decomposing machine (patent numbers 201520658318.9 and 201520561702.7), and then recycling the heavy medium powder by utilizing the soft magnetism of the heavy medium powder through a heavy medium powder separator (patent number 201520059633. X) so as to realize the recycling of the heavy medium powder.
The micron-sized inert high-density soft magnetic heavy medium particles are called heavy medium or heavy medium powder for short. Compared with the traditional water treatment coagulating sedimentation process and the micro-sand coagulating sedimentation process, the heavy medium coagulating sedimentation process can reduce the sedimentation time and the land occupation area of the sedimentation tank by 20 to 50 percent, further greatly reduce the construction cost under the same water treatment scale, or greatly improve the treatment capacity of a water treatment plant under the same land occupation area.
Therefore, a new heavy medium powder product which is suitable for tap water and sewage treatment, has higher density than micro-sand, is easier to recycle and has less influence on subsequent processes is urgently needed in the market; meanwhile, the product can reduce investment and operation cost and improve water treatment efficiency.
Disclosure of Invention
The invention aims to provide a formula, a preparation method and a using method of heavy medium powder for water treatment, which are suitable for tap water and sewage treatment, have higher density and are easier to recycle than micro-sand and have less influence on subsequent processes.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the formula of the heavy medium powder for water treatment is characterized in that the particle size of the heavy medium powder is 200-300 meshes, and accounts for more than 75% of the total volume of the heavy medium powder, and the innovation points are as follows: comprises the following main materials and ingredients: the main substance is Fe 3 O 4 Said Fe 3 O 4 Accounting for 85 to 99.5 percent of the total mass; the ingredients comprise MnO and SiO 2 、ZnO、TiO 2 、CuO、Al 2 O 3 、CaO、MgO、Bi 2 O 3 Each component in the ingredients accounts for 0.01-8% of the total mass.
Still another object of the present invention is to provide a method for preparing heavy medium powder for water treatment, which is characterized in that: the method specifically comprises the following steps:
(1) Weighing the following raw materials: weighing main substance Fe according to formula proportion 3 O 4 ；
(2) Grinding: putting the weighed main raw materials into grinding equipment, and mixing and grinding; obtaining primary powder with the grain size less than 200 meshes;
(3) Primary magnetic separation: sending the powder which meets the requirement of the primary particle size after grinding into a magnetic separator for primary magnetic separation to remove nonmagnetic substances in the powder;
(4) And (3) drying: dehydrating and drying the powder from which the nonmagnetic substances are removed to remove moisture in the powder; (5) roasting: mixing the dried powder with MnO, znO and Al 2 O 3 、CaO、MgO、Bi 2 O 3 、SiO 2 、TiO 2 One or more of CuO and CuO are fed into a rotary roasting furnace together according to the proportion in the formula, and roasting is carried out while mixing;
(6) Screening: gradually cooling the semi-finished product after roasting to normal temperature, screening to obtain a semi-finished product with the particle size of 300-200 meshes, and grinding the semi-finished product with the particle size of more than 200 meshes in the step (2); granulating the semi-finished product with the mesh size less than 300, and then grinding in the step (2); (7) secondary magnetic separation: magnetically separating the screened semi-finished product meeting the particle size requirement for the second time, and removing non-magnetic substances again to produce a finished product of dense medium powder; the content of magnetic substances in the heavy medium powder is more than 90 percent, the particle size range of 200 meshes to 300 meshes accounts for more than 75 percent of the total volume of the heavy medium powder, and the true density is 3.5 to 5.5g/cm 3 。
Further, the grinding process in the step (2) adopts a ball mill or an air flow mill; when the ball mill is selected, one of steel ball dry milling, ceramic ball dry milling or wet milling by using distilled water or deionized water as a dispersant is selected.
Further, in the drying procedure in the step (4), the drying temperature is 90-100 ℃, and the drying time is 1-3h.
Further, in the roasting step in the step (5), the oxygen concentration is set to be 0.0-4.5% during roasting, the temperature rise time is 1-3h, the roasting temperature is 600-850 ℃, and the roasting time is 3-4h.
Further, the time for cooling to the normal temperature in the step (6) is 1-3h, the oxygen concentration during cooling is set as the oxygen concentration during roasting, and atmosphere protection is carried out; and (4) in the screening process in the step (6), a double-layer screening machine is selected, and particles exceeding the range of 300-200 meshes in particle size requirement are separated.
Further, the granulation process in the step (6) adopts spray granulation, and during granulation, the temperature of the slurry is set to be 40-50 ℃, and polyvinyl alcohol or methyl cellulose is added as a binder to form particles with the diameter of 50-200 meshes.
The invention also aims to provide a using method of the heavy medium powder for water treatment, which is characterized by comprising the following steps: the method comprises the following steps: the raw water to be treated flows through a mixing tank, a primary flocculation tank, a flocculation reaction tank, a sedimentation tank and an ultrafiltration membrane tank in sequence and then is discharged;
a. pumping raw water to be treated into a mixing pool by pumping or gravity flow, and adding a coagulant into the mixing pool; starting the stirrer to stir at a stirring speed of 200-350s -1 Stirring for 2-5min; fully mixing the coagulant with raw water to be treated;
b. the raw water added with the coagulant enters a primary flocculation tank, and dense medium powder is added into the primary flocculation tank; starting the stirrer to stir at a stirring speed of 150-300s -1 Stirring for 2-6min;
c. adding coagulant and heavy medium powder into water, adding coagulant aid into the flocculation reaction tank, starting a stirrer to stir at the stirring speed of 40-150s -1 Stirring for 2-6min; so that sludge impurities in the raw water are gradually condensed into flocs;
d. water containing floc in the flocculation reaction tank enters a sedimentation tank for sedimentation;
e. clear water on the upper layer of the sedimentation tank enters an ultrafiltration membrane tank, ultrafiltration membrane filtration treatment is carried out, and then disinfection treatment is further carried out to form drinking tap water for delivery;
f. and pumping the floc sediment at the bottom of the sedimentation tank into a floc removing machine, smashing sludge flocs by using the floc removing machine to separate sludge impurities from heavy medium powder flocs, then sending substances such as the sludge after floc removal, the heavy medium powder, water and the like into a heavy medium recycling machine to recycle the heavy medium powder, and putting the recycled heavy medium powder into the primary flocculation tank again to continuously participate in flocculation reaction, thereby realizing the recycling of the heavy medium powder.
Further, the rotating speed of a motor of the floc removing machine in the step f is 900-3000r/min; the magnetic induction intensity, namely the magnetic flux, on the surface of the roller of the dense medium recycling machine is more than 150mT.
Further, the addition amount of the coagulant in the step a is 10-20mg/L; the addition amount of the dense medium powder in the step b is 8-12mg/L; the addition amount of the coagulant aid in the step c is 0.1-0.2mg/L.
The invention has the following beneficial effects:
1. the dense medium powder produced by the preparation method of the dense medium powder for water treatment is suitable for tap water and sewage treatment, has higher density than micro-sand, is easier to recycle, has less influence on subsequent processes, and can reduce the investment cost and improve the drinking water treatment efficiency.
2. The heavy medium powder produced by the preparation method of the heavy medium powder for water treatment has the advantages of magnetic content of more than 90 percent, high finished product density, easier precipitation of flocs formed by flocs as floc cores than that formed by micro-sand, higher magnetic content, and easier recovery and recycling than micro-sand.
3. In the preparation method of the heavy medium powder for water treatment, mnO, znO and Al are added in the roasting stage 2 O 3 、CaO、MgO、Bi 2 O 3 、SiO 2 、TiO 2 One or more of CuO and the heavy medium powder can effectively ensure the temperature performance characteristic of the heavy medium powder, so that the heavy medium powder has high recovery efficiency through the heavy medium recovery machine in different environments all the year round; meanwhile, the surfaces of the dense medium powder particles are fully passivated, the phenomenon that a very small amount of suspended dense medium powder flocs enter a subsequent ultrafiltration process stage along with water flow loss to damage the surfaces of the ultrafiltration membranes is avoided, and the service life of the ultrafiltration membranes is effectively prolonged.
4. In the using method of the heavy medium powder for water treatment, a proper amount of heavy medium powder is added into the primary flocculation tank, after the heavy medium powder is uniformly stirred, the heavy medium powder flows into the flocculation reaction tank along with water flow, and in the primary flocculation tank and the flocculation reaction tank, the heavy medium powder is gradually used as a flocculation core to participate in flocculation reaction, so that the flocculation reaction speed is accelerated, the floc forming time is shortened, the mass density of the floc is improved, the sedimentation speed of the floc is accelerated after the floc enters the sedimentation tank, and the treatment effect is improved.
5. In the using method of the heavy medium powder for water treatment, the sludge floc groups from the sedimentation tank are smashed by using the floc breaker, so that sludge impurities are separated from the heavy medium floc cores, then the sludge impurities immediately enter the heavy medium powder reclaimer to reclaim the heavy medium powder, the recovery rate reaches more than 98 percent, and the reclaimed heavy medium powder is added into the primary flocculation tank again to realize the recycling of the heavy medium powder.
Drawings
FIG. 1 is a process flow diagram of a method for preparing dense medium powder for water treatment according to the present invention.
FIG. 2 is a process flow diagram of a method of using the dense medium powder for water treatment according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The formula of the dense medium powder for water treatment comprises the following main substances and ingredients: the main substance is Fe 3 O 4 ，Fe 3 O 4 Accounting for 85 to 99.5 percent of the total mass; the ingredients comprise MnO and SiO 2 、ZnO、TiO 2 、CuO、Al 2 O 3 、CaO、MgO、Bi 2 O 3 One or more of the above ingredients, wherein each ingredient in the ingredients accounts for 0.01-8% of the total mass.
As shown in fig. 1, a preparation method of dense medium powder for water treatment specifically comprises the following steps:
(1) Weighing the following raw materials: weighing main substance Fe with soft magnetism according to formula proportion 3 O 4 ；
(2) Grinding: putting the weighed main substances into grinding equipment, and mixing and grinding; obtaining primary powder with the grain size less than 200 meshes; the grinding process adopts a roller ball mill or an airflow mill; when the roller ball mill is selected, one of steel ball dry milling, ceramic ball dry milling or wet milling by using distilled water or deionized water as a dispersant can be used. When the steel ball is wet-milled, the grading proportion of the powder material to the steel ball and water is m (material): m (steel ball): m (water) =1: (2-3.2): (0.7-0.9).
(3) Primary magnetic separation: sending the powder which meets the requirement of the primary particle size after grinding into a magnetic separator for primary magnetic separation to remove nonmagnetic substances in the powder;
(4) Drying: dehydrating and drying the powder from which the nonmagnetic substances are removed to remove moisture in the powder; and (3) a drying procedure, wherein the drying temperature is 90-100 ℃, and the drying time is 1-3h.
(5) Roasting: mixing the dried powder with MnO, znO and Al 2 O 3 、CaO、MgO、Bi 2 O 3 、SiO 2 、TiO 2 One or more of CuO and CuO are fed into a rotary roasting furnace together according to the proportion in the formula, and roasting is carried out while mixing; and (3) a roasting process, wherein the oxygen concentration is set to be 0.0-4.5% during roasting, the temperature rise time is 1-3h, the roasting temperature is 600-850 ℃, and the roasting time is 3-4h. In the preparation method of the dense medium powder for water treatment, a small amount of volatile impurities which can cause secondary pollution to water quality in the raw materials are removed in the roasting stage, and MnO, znO and Al are added in the roasting stage 2 O 3 、CaO、MgO、Bi 2 O 3 、SiO 2 、TiO 2 One or more ingredients in CuO have fluxing action, or the raw materials and the ingredients have solid-phase reaction between different metal oxides, so that the temperature performance characteristic of the dense medium powder can be effectively ensured, and the recovery efficiency of the dense medium powder through the dense medium recovery machine is high in the environment of different temperatures all the year round; meanwhile, the surfaces of the dense medium powder particles are fully passivated, the phenomenon that a very small amount of suspended dense medium powder flocs enter a subsequent ultrafiltration process stage along with water flow loss to damage the surfaces of the ultrafiltration membranes is avoided, and the service life of the ultrafiltration membranes is effectively prolonged.
(6) Screening: and gradually cooling the roasted semi-finished product to normal temperature, screening to obtain a semi-finished product with the particle size range of 300-200 meshes. Meanwhile, grinding the semi-finished product with the particle size larger than 200 meshes in the step (2) again; granulating the semi-finished product with the size less than 300 meshes, and then grinding in the step (2); wherein the time for cooling to normal temperature is 1-3h, the oxygen concentration during cooling is set as the oxygen concentration during roasting, and atmosphere protection is carried out; wherein, the screening process adopts a double-layer screening machine to separate particles which exceed the particle size requirement of 200 meshes to 300 meshes and ensure that the particle size distribution is 200 meshes to 300 meshes and is more than 75 percent. The granulation treatment adopts a spray granulation process, and during granulation, the temperature of the slurry is set to be 40-50 ℃, and a binding agent such as polyvinyl alcohol or methylcellulose is added to form particles with the diameter of 50-200 meshes.
(7) Secondary magnetic separation: magnetically separating the screened semi-finished product meeting the particle size requirement for the second time, and removing non-magnetic substances again to produce a finished product of dense medium powder; the content of magnetic substances in the finished product of the heavy medium powder is more than 90 percent, the particle size of 200-300 meshes accounts for more than 75 percent of the total volume of the heavy medium powder, and the true density is 3.5-5.5g/cm 3 . The heavy medium powder produced by the preparation method of the heavy medium powder for water treatment has the magnetic substance content of more than 90 percent and the finished product density is high, and the floc formed by the floc core is easier to precipitate than sand, has higher magnetic content and is easier to recover and recycle than sand.
As shown in FIG. 2, a method for using dense medium powder for water treatment comprises the following steps: raw water to be treated flows through a mixing tank, a primary flocculation tank, a flocculation reaction tank, a sedimentation tank and an ultrafiltration membrane tank in sequence and then is discharged;
a. pumping raw water to be treated into a mixing pool or making the raw water flow into the mixing pool through gravity flow, and adding a coagulant into the mixing pool; the addition amount of the coagulant is 10-20mg/L; starting the stirrer to stir at a stirring speed of 200-350s -1 Stirring for 2-5min; fully mixing the coagulant with raw water to be treated;
b. the raw water added with the coagulant automatically flows into a primary flocculation tank, and dense medium powder is added into the primary flocculation tank; the addition amount of the dense medium powder is 50-200mg/L; starting the stirrer to stir at a stirring speed of 150-300s -1 Stirring for 2-6min;
c. the water added with coagulant and dense medium powder automatically flows into a flocculation reaction tank, coagulant aid is added into the flocculation reaction tank, and the addition amount of the coagulant aid is 0.1-0.2mg/L; starting the stirrer to stir at a stirring speed of 40-150s -1 Stirring for 2-6min;so that sludge impurities such as fine suspended particles, colloidal particles and the like in the raw water are gradually condensed into flocs;
d. the water containing flocs in the flocculation reaction tank automatically flows into a sedimentation tank for sedimentation;
e. clear water on the upper layer of the sedimentation tank automatically flows into an ultrafiltration membrane tank, ultrafiltration membrane filtration treatment is carried out, and then disinfection treatment is further carried out to form drinking tap water which leaves a factory;
f. and pumping the floc sediment at the bottom of the sedimentation tank into a floc removing machine, smashing the floc by using the floc removing machine to separate sludge impurities from heavy medium floc nuclei, then, recovering the heavy medium powder by using a heavy medium recovering machine after the floc removing, and putting the recovered heavy medium powder into a primary flocculation tank to continuously participate in flocculation reaction so as to realize the recycling of the heavy medium powder. Wherein the rotating speed of a motor of the deflocculating machine is 900-3000r/min; the magnetic induction intensity (magnetic flux) of the roller surface of the heavy medium recycling machine is more than 150mT. In the using method of the heavy medium powder for water treatment, a proper amount of heavy medium powder is added into the primary flocculation tank, after the heavy medium powder is uniformly stirred, the heavy medium powder flows into the flocculation reaction tank along with water flow, and in the primary flocculation tank and the flocculation reaction tank, the heavy medium powder is gradually used as a flocculation core to participate in flocculation reaction, so that the flocculation reaction speed is accelerated, the floc forming time is shortened, the mass density of the floc is improved, the sedimentation speed of the floc is accelerated after the floc enters the sedimentation tank, and the treatment effect is improved.
In the using method of the heavy medium powder for water treatment, the sludge floc groups from the sedimentation tank are smashed by using the floc breaker, so that sludge impurities are separated from the heavy medium floc cores, then the sludge impurities immediately enter the heavy medium powder reclaimer to reclaim the heavy medium powder, the reclamation rate of the heavy medium powder is realized, the reclamation rate reaches more than 98 percent, and the heavy medium powder is added into the primary flocculation tank to realize the repeated recycling of the heavy medium powder.
The dense medium powder produced by the preparation method of the dense medium powder for water treatment is suitable for tap water and sewage treatment, has higher density than micro-sand, is easier to recycle, has less influence on subsequent processes, and can reduce the investment cost and improve the drinking water treatment efficiency.
Selecting three equal parts of river water of a certain section of the downstream of the Yangtze river as raw water to be treated, wherein the turbidity is 55-60 NTU, and the COD is 3-5 mg/L, sequentially flowing through a mixing tank, a primary flocculation tank, a flocculation reaction tank and a sedimentation tank, and then filtering by an ultrafiltration membrane to obtain water;
example 1
Adding 10mg/L coagulant into a mixing tank, adding 100mg/L heavy medium powder into a primary flocculation tank, adding 0.1mg/L coagulant aid into a flocculation reaction tank, and stirring at certain speed by using stirrers in the mixing tank, the primary flocculation tank and the flocculation reaction tank respectively, wherein the G values are designed to be 350s -1 、300s -1 、150s -1 The design stirring time is 2min, 2min and 2min respectively, so that the coagulant and coagulant aid added into the water to be treated are fully stirred and mixed with the water, in this way, in the reaction tank, pollutants such as sludge, colloid impurities and the like in the raw water are gradually condensed in the primary flocculation tank and the flocculation reaction tank to form flocs, the floc precipitation is realized in the precipitation tank, the retention time of the precipitation tank is 10min, the design upward flow velocity is 20m/h, and the effluent of the precipitation tank and the effluent of ultrafiltration are taken for analysis. The experiments were performed in parallel 3 times.
Example 2
Adding coagulant 10mg/L, adding sand 100mg/L and 200-300 mesh (over 75%) in the primary flocculation tank, adding coagulant aid 0.1mg/L in the flocculation reaction tank, stirring in the mixing tank, the primary flocculation tank and the flocculation reaction tank at certain speed, and setting G values to 350s -1 、300s -1 、150s -1 The design stirring time is 2min, 2min and 2min respectively, so that the coagulant and coagulant aid added into the water to be treated are fully stirred and mixed with the water, in this way, in the reaction tank, after pollutants such as sludge, impurities and the like in the raw water are gradually condensed in the primary flocculation tank and the flocculation reaction tank to form flocs, the floc precipitation is realized in the precipitation tank, the retention time of the precipitation tank is 15min, the upward flow velocity is designed to be 20m/h, and the effluent of the precipitation tank and the ultrafiltration effluent are taken for analysis. The parallel tests were performed 3 times.
Example 3
Adding 10mg/L coagulant into a mixing tankAdding no heavy medium particles or micro sand into the primary flocculation tank, adding 0.1mg/L coagulant aid into the flocculation reaction tank, stirring at certain speed by a stirrer in the mixing tank, the primary flocculation tank and the flocculation reaction tank respectively, and designing G values to be 350s respectively -1 、300s -1 、150s -1 The stirring time is designed to be 2min, 2min and 2min respectively, so that the coagulant and coagulant aid added into the water to be treated are fully stirred and mixed with the water, in this way, in the reaction tank, pollutants such as sludge and impurities in the raw water are gradually coagulated in the primary flocculation tank and the flocculation reaction tank to form flocs, the flocs are precipitated in the sedimentation tank, the retention time of the sedimentation tank is 90min, the upward flow velocity is designed to be 20m/h, and the effluent of the sedimentation tank and the effluent of ultrafiltration are taken for analysis. The experiments were performed in parallel 3 times.
Comparing example 1, example 2 and example 3, the method of using the heavy medium powder for water treatment according to the present invention in the water treatment process has the following effects on turbidity and COD in the water body as shown in the following table:
comparing the above table, it can be seen that, compared with the micro-sand flocculation and the conventional coagulation sedimentation, the heavy medium coagulation sedimentation performed by the heavy medium particles provided by the present invention for water treatment has faster and better water treatment effect, has less influence on the subsequent processes, and can effectively improve the drinking water treatment efficiency.
When the dense medium powder for water treatment is applied to tap water treatment, dialysis of heavy metal ions harmful to human bodies in water does not exist in the dense medium powder in practical application through proper control of the formula, or the dialysis degree of the heavy metal ions in the water of the dense medium powder meets the requirements of sanitary Standard for Drinking Water GB 5749-2006.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be implemented on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the present invention.
Claims (10)
1. The formula of the dense medium powder for water treatment is characterized in that the particle size of the dense medium powder is 200-300 meshes, and accounts for more than 75% of the total volume of the dense medium powder, and the formula is as follows: comprises the following main materials and ingredients: the main substance is Fe 3 O 4 Said Fe 3 O 4 Accounting for 85 to 99.5 percent of the total mass; the ingredients comprise MnO and SiO 2 、ZnO、TiO 2 、CuO、Al 2 O 3 、CaO、MgO、Bi 2 O 3 Each component in the ingredients accounts for 0.01-8% of the total mass.
2. A method for preparing dense medium powder for water treatment as claimed in claim 1, characterized in that: the method specifically comprises the following steps:
(1) Weighing the following raw materials: weighing main substance Fe according to the proportion of the formula 3 O 4 ；
(2) Grinding: putting the weighed main raw materials into grinding equipment, and mixing and grinding; obtaining a primary powder with a particle size of less than 200 mesh;
(3) Primary magnetic separation: sending the powder which meets the requirement of the primary particle size after grinding into a magnetic separator for primary magnetic separation to remove nonmagnetic substances in the powder;
(4) And (3) drying: dehydrating and drying the powder from which the nonmagnetic substances are removed to remove moisture in the powder;
(5) Roasting: mixing the dried powder with MnO, znO and Al 2 O 3 、CaO、MgO、Bi 2 O 3 、SiO 2 、TiO 2 One or more of CuO and CuO are fed into a rotary roasting furnace together according to the proportion in the formula, and the mixture is mixed and roasted at the same time;
(6) Screening: gradually cooling the roasted semi-finished product to normal temperature, screening to obtain a semi-finished product with the particle size of 200-300 meshes according with the requirement of the particle size, and grinding the semi-finished product with the particle size of more than 200 meshes in the step (2); the semi-finished product with the mesh less than 300 is processedAfter granulation treatment, grinding in the step (2) is carried out again; (7) secondary magnetic separation: carrying out secondary magnetic separation on the semi-finished product which is screened and meets the requirement of the particle size, removing non-magnetic substances again, and producing a finished product of dense medium powder; the content of magnetic substances in the heavy medium powder is more than 90 percent, the particle size range of 200 meshes to 300 meshes accounts for more than 75 percent of the total volume of the heavy medium powder, and the true density is 3.5 to 5.5g/cm 3 。
3. The method for preparing dense medium powder for water treatment as claimed in claim 2, wherein: the grinding procedure in the step (2) adopts a ball mill or an airflow mill; when the ball mill is selected, one of dry milling of steel balls, dry milling of ceramic balls or wet milling by using distilled water or deionized water as a dispersing agent is selected.
4. The method for preparing dense medium powder for water treatment as claimed in claim 2, wherein: in the drying procedure in the step (4), the drying temperature is 90-100 ℃, and the drying time is 1-3h.
5. The method for preparing dense medium powder for water treatment as claimed in claim 2, wherein: in the roasting procedure in the step (5), the oxygen concentration is set to be 0.0-4.5% during roasting, the temperature rise time is 1-3h, the roasting temperature is 600-850 ℃, and the roasting time is 3-4h.
6. The method for preparing dense medium powder for water treatment as claimed in claim 2, wherein: the time for cooling to the normal temperature in the step (6) is 1-3h, the oxygen concentration during cooling is set as the oxygen concentration during roasting, and atmosphere protection is carried out; and (4) in the screening process in the step (6), a double-layer screening machine is selected, and particles which exceed the particle size requirement of 300-200 meshes are separated.
7. The method for preparing dense medium powder for water treatment as claimed in claim 2, wherein: the granulation process in the step (6) adopts spray granulation, and during granulation, the temperature of the slurry is set to be 40-50 ℃, and polyvinyl alcohol or methyl cellulose is added as an adhesive to form particles with the diameter of 50-200 meshes.
8. The use method of the dense medium powder for water treatment according to claim 1, characterized by comprising the following steps: the method comprises the following steps: raw water to be treated flows through a mixing tank, a primary flocculation tank, a flocculation reaction tank, a sedimentation tank and an ultrafiltration membrane tank in sequence and then is discharged;
a. pumping raw water to be treated into a mixing tank, and adding a coagulant into the mixing tank; starting the stirrer to stir at a stirring speed of 200-350s -1 Stirring for 2-5min; fully mixing the coagulant with raw water to be treated;
b. fully mixing a coagulant with raw water, then automatically flowing into a primary flocculation tank, and adding dense medium powder into the primary flocculation tank; starting the stirrer to stir at a stirring speed of 150-300s -1 Stirring for 2-6min;
c. the water containing coagulant and dense medium powder automatically flows into a flocculation reaction tank, coagulant aid is added into the flocculation reaction tank, a stirrer is started to stir at the stirring speed of 40-150s -1 Stirring for 2-6min; so that sludge impurities in water are gradually condensed into flocs;
d. the water containing the floc in the flocculation reaction tank automatically flows into a sedimentation tank for sedimentation;
e. clear water on the upper layer of the sedimentation tank automatically flows into an ultrafiltration membrane tank, is filtered by an ultrafiltration membrane, and is further disinfected to form tap drinking water for delivery;
f. pumping the floc sediment containing the heavy medium powder at the bottom of the sedimentation tank into a floc removing machine, smashing sludge flocs by using the floc removing machine to separate sludge impurities from heavy medium flocs, then, allowing the substances after floc removal to enter a heavy medium recycling machine, recycling the heavy medium powder by using a heavy medium powder separator, and putting the recycled heavy medium powder into a primary flocculation tank to continuously participate in flocculation reaction, thereby realizing recycling of the heavy medium powder.
9. The use method of the dense medium powder for water treatment as claimed in claim 8, wherein: the rotating speed of a motor of the floc remover in the step f is 900-3000r/min; the magnetic induction intensity, namely the magnetic flux, on the surface of the roller of the dense medium recycling machine is more than 150mT.
10. The use method of the dense medium powder for water treatment as claimed in claim 8, wherein: the addition amount of the coagulant in the step a is 10-20mg/L; the addition amount of the dense medium powder in the step b is 8-12mg/L; the addition amount of the coagulant aid in the step c is 0.1-0.2mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710223746.2A CN106915809B (en) | 2017-04-07 | 2017-04-07 | Formula, preparation method and use method of heavy medium powder for water treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710223746.2A CN106915809B (en) | 2017-04-07 | 2017-04-07 | Formula, preparation method and use method of heavy medium powder for water treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106915809A CN106915809A (en) | 2017-07-04 |
| CN106915809B true CN106915809B (en) | 2023-04-07 |
Family
ID=59568286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710223746.2A Active CN106915809B (en) | 2017-04-07 | 2017-04-07 | Formula, preparation method and use method of heavy medium powder for water treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106915809B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108889440B (en) * | 2018-05-07 | 2020-03-31 | 李清湘 | Gravity separation medium material for separating metal ore and associated gangue and use method thereof |
| CN109292921A (en) * | 2018-10-15 | 2019-02-01 | 太平洋水处理工程有限公司 | A kind of formula and application method of the dense media powder for water treatment |
| CN109317289A (en) * | 2018-11-14 | 2019-02-12 | 王光领 | Dry sand medium preparation process is used on air dry sand Recognition Applied in Coal Preparation System |
| CN113828392A (en) * | 2021-09-22 | 2021-12-24 | 江苏京源环保股份有限公司 | Integrated production device of composite magnetic medium for water treatment and use method thereof |
| CN115057509B (en) * | 2022-06-08 | 2024-01-19 | 华能陇东能源有限责任公司 | Seed crystal pretreatment method suitable for heavy medium reinforced coagulation process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101206941A (en) * | 2006-12-21 | 2008-06-25 | 横店集团东磁股份有限公司 | Preparation method of high-permeability low-temperature co-fired NiCuZn ferrite |
| CN101859622B (en) * | 2009-04-08 | 2012-02-15 | 广东江粉磁材股份有限公司 | Method for manufacturing intermediate-frequency low-loss MnZn ferrite magnetic core |
| CN101948211B (en) * | 2010-09-20 | 2012-04-04 | 攀钢集团钢铁钒钛股份有限公司 | Method for treating vanadium oxide production wastewater |
| CN103739124B (en) * | 2014-01-24 | 2015-12-09 | 太平洋水处理工程有限公司 | A kind of efficient water treatment device and water treatment method |
-
2017
- 2017-04-07 CN CN201710223746.2A patent/CN106915809B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106915809A (en) | 2017-07-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106915809B (en) | Formula, preparation method and use method of heavy medium powder for water treatment | |
| JP4297615B2 (en) | High-speed coagulating sedimentation wastewater treatment method | |
| CN100513334C (en) | Deep treatment process of metallurgical sewage | |
| JP2012206106A (en) | Resin composite, filter aid for water treatment, precoat material for water treatment, and water treatment method | |
| CN106430833A (en) | Treatment method of oil-containing waste water | |
| CN105906133B (en) | A method and device for water purification by strong magnetic separation-magnetic biomass carbon adsorption | |
| JP2001508697A (en) | Physicochemical treatment of runoff for consumption, especially surface water | |
| JP4707752B2 (en) | Water treatment method and water treatment system | |
| CN108640131A (en) | Lithium ore prepares the method and system of lithium carbonate | |
| CN101580318B (en) | Beneficiation wastewater treatment method circularly used for ceramic filter | |
| CN106865708A (en) | A kind of magnetic-coagulation accelerates defecation method | |
| US20210379605A1 (en) | Method and arrangement for process water treatment | |
| CN101665293B (en) | Method for treating non-ferrous metal wastewater containing nickel, lead and cadmium by fractional precipitation | |
| CN101781031B (en) | Purification treatment method of reclaimed papermaking water | |
| JP2002502435A (en) | Method for producing inorganic pigment, inorganic pigment obtained thereby, and apparatus for performing the method | |
| CN102229450A (en) | Integrated membrane purification technology for treating hematite dressing wastewater | |
| CN113683167B (en) | Magnetic coagulation sedimentation sewage treatment system and method based on low-density magnetic particles | |
| CN213623631U (en) | Treatment device for emulsified oil sludge-containing wastewater in gem processing | |
| KR101523281B1 (en) | Integrated processing system for precipitation, absorption and filtration | |
| CN111233487A (en) | Lead filtering method for ceramic material preparation equipment | |
| CN100393420C (en) | Method for separating iron and charcoal from dedusting dust | |
| CN110963630A (en) | Molybdenum-containing wastewater treatment process | |
| CN201711209U (en) | Shell clearing device in sea sand | |
| JP3050817U (en) | Water treatment equipment | |
| CN112811538A (en) | Method for adding and recovering magnetic powder in sewage treatment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |