CN113582407B - Step-by-step treatment method for high-sulfur wastewater in metallurgical industry - Google Patents
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- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 48
- 239000011593 sulfur Substances 0.000 claims abstract description 48
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 44
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 40
- 239000002351 wastewater Substances 0.000 claims abstract description 40
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 31
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000011780 sodium chloride Substances 0.000 claims abstract description 22
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 22
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000001590 oxidative effect Effects 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 15
- 230000002829 reductive effect Effects 0.000 claims abstract description 9
- 239000000706 filtrate Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 8
- HYHCSLBZRBJJCH-UHFFFAOYSA-N sodium polysulfide Chemical compound [Na+].S HYHCSLBZRBJJCH-UHFFFAOYSA-N 0.000 claims description 7
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 7
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 7
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 6
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 6
- 229920002873 Polyethylenimine Polymers 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 229920002717 polyvinylpyridine Polymers 0.000 claims description 4
- 235000010265 sodium sulphite Nutrition 0.000 claims description 3
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 15
- 230000003647 oxidation Effects 0.000 abstract description 14
- 239000007800 oxidant agent Substances 0.000 abstract description 11
- 239000008394 flocculating agent Substances 0.000 abstract description 8
- 150000003568 thioethers Chemical class 0.000 abstract 1
- 239000003513 alkali Substances 0.000 description 5
- 238000006386 neutralization reaction Methods 0.000 description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/0253—Preparation of sulfur; Purification from non-gaseous sulfur compounds other than sulfides or materials containing such sulfides
- C01B17/0259—Preparation of sulfur; Purification from non-gaseous sulfur compounds other than sulfides or materials containing such sulfides by reduction of sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/02—Preparation of sulfur; Purification
- C01B17/06—Preparation of sulfur; Purification from non-gaseous sulfides or materials containing such sulfides, e.g. ores
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a step-by-step treatment method of high-sulfur wastewater in metallurgical industry, which comprises the following steps: step one, adding high-sulfur wastewater into a reaction kettle, dropwise adding a sodium hypochlorite solution while stirring, and controlling the oxidation-reduction potential to be 160 mv to 180mv; step two, when the oxidation-reduction potential of the system exceeds 180mv, stopping dropwise adding the sodium hypochlorite solution, adding a flocculating agent, stirring, and filtering out sulfur; step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution, controlling the oxidation-reduction potential to be 500 mv to 550mv, and completely oxidizing all the reductive sulfides in the solution; step four, when the oxidation-reduction potential of the system exceeds 550mv, stopping the reaction, and directly performing quality-divided concentration on the solution to respectively obtain sodium chloride and sodium sulfate concentrated solutions; and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate. The advantages are that: short process flow, simple operation, thorough oxidation and less oxidant consumption.
Description
Technical Field
The invention relates to the technical field of wastewater treatment in the metallurgical industry, in particular to a step-by-step treatment method of high-sulfur wastewater in the metallurgical industry.
Background
In the metallurgical industry, the sodium-alkali method is usually adopted to treat elemental sulfur in anode mud or sulfide ore so as to realize the enrichment of valuable metals. Alkali liquor can react with elemental sulfur to generate sodium sulfide and sodium polysulfide which are easily dissolved in water, so that the aim of improving metal enrichment is fulfilled, but a large amount of high-sulfur wastewater (the sulfur content in the wastewater is more than 0.2 g/L) which is seriously polluted and extremely difficult to treat is generated, the main components of the high-sulfur wastewater are sodium sulfide, sodium polysulfide and sodium thiosulfate, and the high-sulfur wastewater is one of industrial wastewater which is extremely difficult to treat, and if the wastewater is directly discharged without being treated, the environment can be seriously polluted.
At present, the industrial treatment method of the high-sulfur wastewater mainly comprises a neutralization method, an air oxidation method, a chemical precipitation method and the like. The neutralization method is that the pH value of the waste alkali liquor is adjusted to be neutral by using an acid substance, so that hydrogen sulfide and sulfur are released from sodium polysulfide, sodium sulfide and sodium thiosulfate; the neutralization method has simple process, but the generated hydrogen sulfide can corrode equipment, and the hydrogen sulfide generates sulfur dioxide after combustion, which also pollutes the atmosphere. The air oxidation method mainly makes use of the oxidizing power of oxygen in the air to oxidize the desulfurization waste alkali liquor into salt; the method has the defects of low oxidation efficiency, incomplete oxidation, long oxidation time and the like. The chemical oxidation method is a method for oxidizing sulfides in wastewater to sulfur oxides with higher valence state by utilizing the oxidability of oxidants, the oxidants mainly adopted in the prior art are sodium chlorate, potassium permanganate, hydrogen peroxide and the like, and because the desulfurization waste alkali liquor usually has strong alkalinity, the oxidability of the oxidants can be weakened, the oxidation efficiency is reduced, the usage amount of the oxidants is increased, and the production cost is increased; chemical precipitation processes for treating high sulfur wastewater produce large amounts of sludge. Therefore, further improvements are needed in the existing treatment methods.
Disclosure of Invention
The invention aims to make up the defects and discloses a method for treating high-sulfur wastewater in the metallurgical industry step by step to the society, which has the advantages of short process flow, simple operation, thorough oxidation and less oxidant consumption.
The technical scheme of the invention is realized as follows:
a step-by-step treatment method of high-sulfur wastewater in metallurgical industry comprises the following steps:
step one, adding high-sulfur wastewater into a reaction kettle, dropwise adding a sodium hypochlorite solution while stirring, and controlling the oxidation-reduction potential to be 160 mv to 180mv;
step two, when the oxidation-reduction potential of the system exceeds 180mv, stopping dropwise adding the sodium hypochlorite solution, adding a flocculating agent, stirring, and filtering out sulfur;
step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution, controlling the oxidation-reduction potential to be 500 mv-550 mv, and completely oxidizing the reductive sulfide in the solution;
step four, when the oxidation-reduction potential of the system exceeds 550mv, the reaction is stopped, and the solution is directly concentrated according to the quality to respectively obtain sodium chloride and sodium sulfate concentrated solution;
and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate.
The measures for further optimizing the technical scheme are as follows:
as an improvement, in the first step, the initial oxidation-reduction potential is between-650 mv and-550 mv.
In the first step, the concentration of the sodium hypochlorite solution is 8-13%.
In the second step, a non-ionic flocculant is used as the flocculant.
As an improvement, the flocculant adopts polyacrylamide, polyethyleneimine or polyvinyl pyridine.
In the second step, the mixture is stirred for 3min to 5min.
As an improvement, in the fourth step, the mass concentration is carried out in an electrodialyzer.
As an improvement, the high-sulfur wastewater contains one or more of sodium sulfide, sodium polysulfide, hydrogen sulfide and sodium sulfite.
Compared with the prior art, the invention has the advantages that:
oxidizing the high-sulfur wastewater by using a sodium hypochlorite solution, controlling the oxidation reaction process by controlling the oxidation-reduction potential, controlling the sulfur in the high-sulfur wastewater to be oxidized into elemental sulfur, filtering out sulfur, and avoiding further oxidation of the elemental sulfur; and continuously dropwise adding a sodium hypochlorite solution into the filtrate, similarly controlling the oxidation-reduction potential, and after the reaction is completed, performing mass concentration on the solution to obtain sodium chloride and sodium sulfate. The method controls the reaction process by controlling the oxidation-reduction potential, utilizes the characteristics of alkalinity and lower oxidation-reduction potential of the sodium hypochlorite solution, has short process flow, simple operation and low energy consumption, reduces the using amount of the oxidant sodium hypochlorite, and has thorough oxidation, environmental protection and simple equipment.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in figure 1, the step-by-step treatment method of the high-sulfur wastewater in the metallurgical industry comprises the following steps:
step one, adding high-sulfur wastewater into a reaction kettle, wherein the initial oxidation-reduction potential is between-650 mv and-550 mv, dropwise adding a sodium hypochlorite solution while stirring, and controlling the oxidation-reduction potential to be between 160 mv and 180mv;
step two, when the oxidation-reduction potential of the system exceeds 180mv, stopping dropwise adding the sodium hypochlorite solution, adding a flocculating agent, stirring for 3min to 5min, and filtering out sulfur; the flocculating agent is a nonionic flocculating agent, and is preferably Polyacrylamide (PAM), polyethyleneimine (PEI) or polyvinyl pyridine;
step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution, controlling the oxidation-reduction potential to be 500 mv-550 mv, and completely oxidizing the reductive sulfide in the solution;
step four, when the oxidation-reduction potential of the system exceeds 550mv, the reaction is stopped, and the solution is directly introduced into an electrodialyzer for quality separation and concentration to respectively obtain sodium chloride and sodium sulfate concentrated solution;
and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate.
The high-sulfur wastewater contains one or more of sodium sulfide, sodium polysulfide, hydrogen sulfide and sodium sulfite, the high-sulfur wastewater is alkaline, and a sodium hypochlorite solution is used as an oxidant, the concentration of the oxidant sodium hypochlorite solution is 8-13%, and the sodium hypochlorite solution is alkaline, so that the high-sulfur wastewater can better adapt to the oxidation environment of the high-sulfur wastewater; the lower the oxidation-reduction potential, the stronger the reducibility of the substances, and the lower the oxidation-reduction potential of the sodium hypochlorite solution, the initial oxidation-reduction potential is between-650 mv and-550 mv in the high-sulfur wastewater, and after the oxidant sodium hypochlorite solution is dripped, the oxidation-reduction potential is controlled to be between 160 mv and 180mv, so that the reaction time can be effectively shortened.
The following is further illustrated by specific examples:
example 1
A step-by-step treatment method of high-sulfur wastewater in metallurgical industry comprises the following steps:
step one, adding 50 liters of sulfur-containing wastewater into a reaction kettle, stirring while dropwise adding a sodium hypochlorite solution with the concentration of 10% and controlling the oxidation-reduction potential to be 160 mv to 180mv, wherein the initial oxidation-reduction potential is between-650 mv and-550 mv;
step two, when the oxidation-reduction potential of the system exceeds 180mv, stopping dropwise adding the sodium hypochlorite solution, adding a flocculating agent (PAM), stirring for 3min, and filtering out sulfur;
step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution with the concentration of 10%, controlling the oxidation-reduction potential to be 500 mv to 550mv, and completely oxidizing the reductive sulfide in the solution;
step four, when the oxidation-reduction potential of the system exceeds 550mv, the reaction is stopped, and the solution is directly introduced into an electrodialyzer for quality separation and concentration to respectively obtain sodium chloride and sodium sulfate concentrated solution;
and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate.
Example 2
A step-by-step treatment method of high-sulfur wastewater in metallurgical industry comprises the following steps:
step one, adding 80 liters of sulfur-containing wastewater into a reaction kettle, wherein the initial oxidation-reduction potential is between-650 mv and-550 mv, dropwise adding a sodium hypochlorite solution with the concentration of 13% while stirring, and controlling the oxidation-reduction potential to be between 160 mv and 170mv;
step two, stopping dripping the sodium hypochlorite solution when the oxidation-reduction potential of the system exceeds 170mv, adding a flocculating agent (PEI), stirring for 5min, and filtering out sulfur;
step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution with the concentration of 13%, controlling the oxidation-reduction potential to be 500 mv-530 mv, and completely oxidizing the reductive sulfides in the solution;
step four, when the oxidation-reduction potential of the system exceeds 530mv, the reaction is stopped, and the solution is directly introduced into an electrodialyzer for quality separation and concentration to respectively obtain sodium chloride and sodium sulfate concentrated solution;
and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate.
Example 3
A step-by-step treatment method of high-sulfur wastewater in metallurgical industry comprises the following steps:
step one, adding 60 liters of sulfur-containing wastewater into a reaction kettle, stirring while dropwise adding a sodium hypochlorite solution with the concentration of 8% and controlling the oxidation-reduction potential to be 170mv to 180mv, wherein the initial oxidation-reduction potential is between-650 mv and-550 mv;
step two, when the oxidation-reduction potential of the system exceeds 180mv, stopping dropwise adding the sodium hypochlorite solution, adding a flocculating agent (polyvinyl pyridine), stirring for 4min, and filtering out sulfur;
step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution with the concentration of 8%, controlling the oxidation-reduction potential to be between 530mv and 550mv, and completely oxidizing the reductive sulfide in the solution;
step four, when the oxidation-reduction potential of the system exceeds 550mv, the reaction is stopped, and the solution is directly introduced into an electrodialyzer for quality separation concentration to respectively obtain sodium chloride concentrated solution and sodium sulfate concentrated solution;
and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate.
According to the step-by-step treatment method of the high-sulfur wastewater in the metallurgical industry, the good oxidation capacity of the sodium hypochlorite solution under the alkaline condition is utilized, the reaction process is controlled by controlling the oxidation-reduction potential of the high-sulfur wastewater, sodium polysulfide, sodium sulfide and sodium thiosulfate are converted into elemental sulfur and are separated from the reaction solution, further oxidation of the elemental sulfur is avoided as far as possible, and the using amount of an oxidant can be greatly reduced.
While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the present invention.
Claims (5)
1. A step-by-step treatment method of high-sulfur wastewater in metallurgical industry is characterized in that: the method comprises the following steps:
step one, adding high-sulfur wastewater into a reaction kettle, wherein the initial oxidation-reduction potential is-650 mv to-550 mv, dropwise adding a sodium chlorate solution with the secondary concentration of 8% to 13% while stirring, and controlling the oxidation-reduction potential to be 160 mv to 180mv;
step two, stopping dripping the sodium hypochlorite solution when the oxidation-reduction potential of the system exceeds 180mv, adding a nonionic flocculant, stirring, and filtering out sulfur;
step three, adding the filtrate into the reaction kettle again, continuously dropwise adding a sodium hypochlorite solution, controlling the oxidation-reduction potential to be 500 mv-550 mv, and completely oxidizing the reductive sulfide in the solution;
step four, when the oxidation-reduction potential of the system exceeds 550mv, the reaction is stopped, and the solution is directly concentrated according to the quality to respectively obtain sodium chloride and sodium sulfate concentrated solution;
and step five, concentrating and crystallizing the concentrated solution of sodium chloride and sodium sulfate to obtain sodium chloride and sodium sulfate.
2. The method for treating high-sulfur wastewater in metallurgical industry in steps as claimed in claim 1, wherein the method comprises the following steps: the flocculant is polyacrylamide, polyethyleneimine or polyvinyl pyridine.
3. The method for treating high-sulfur wastewater in metallurgical industry in steps as claimed in claim 1, wherein the method comprises the following steps: and in the second step, stirring for 3min to 5min.
4. The method for treating high-sulfur wastewater in metallurgical industry in steps as claimed in claim 1, wherein the method comprises the following steps: in the fourth step, the separation and concentration are carried out in an electrodialyzer.
5. The method for treating high-sulfur wastewater in metallurgical industry in steps as claimed in claim 1, wherein the method comprises the following steps: the high-sulfur wastewater contains one or more of sodium sulfide, sodium polysulfide, hydrogen sulfide and sodium sulfite.
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