CN101386424B - Method for preparing modification forming magnalium hydrotalcite and application - Google Patents
Method for preparing modification forming magnalium hydrotalcite and application Download PDFInfo
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- CN101386424B CN101386424B CN2008101577612A CN200810157761A CN101386424B CN 101386424 B CN101386424 B CN 101386424B CN 2008101577612 A CN2008101577612 A CN 2008101577612A CN 200810157761 A CN200810157761 A CN 200810157761A CN 101386424 B CN101386424 B CN 101386424B
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- hydrotalcite
- magnesium aluminum
- magnesium
- modification forming
- aqueous solution
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- 229960001545 hydrotalcite Drugs 0.000 title claims abstract description 52
- 229910001701 hydrotalcite Inorganic materials 0.000 title claims abstract description 52
- 230000004048 modification Effects 0.000 title claims description 34
- 238000012986 modification Methods 0.000 title claims description 34
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 title abstract description 5
- 238000000034 method Methods 0.000 title description 2
- 229910001051 Magnalium Inorganic materials 0.000 title 1
- 239000011777 magnesium Substances 0.000 claims abstract description 59
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 49
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000007864 aqueous solution Substances 0.000 claims abstract description 23
- 239000002351 wastewater Substances 0.000 claims abstract description 14
- 239000010865 sewage Substances 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000009395 breeding Methods 0.000 claims abstract description 9
- 230000001488 breeding effect Effects 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000002425 crystallisation Methods 0.000 claims abstract description 5
- 230000008025 crystallization Effects 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 4
- 238000001125 extrusion Methods 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims abstract description 3
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 claims description 8
- 159000000003 magnesium salts Chemical class 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 150000002500 ions Chemical class 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 4
- 235000014347 soups Nutrition 0.000 claims description 4
- 238000005119 centrifugation Methods 0.000 claims description 3
- 150000002680 magnesium Chemical class 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 17
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 14
- 239000011574 phosphorus Substances 0.000 abstract description 14
- 239000013535 sea water Substances 0.000 abstract description 11
- 230000008929 regeneration Effects 0.000 abstract description 10
- 238000011069 regeneration method Methods 0.000 abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 8
- 238000003795 desorption Methods 0.000 abstract description 5
- 238000005342 ion exchange Methods 0.000 abstract description 4
- 230000032683 aging Effects 0.000 abstract description 2
- 229910003023 Mg-Al Inorganic materials 0.000 abstract 3
- 238000000926 separation method Methods 0.000 abstract 2
- 239000003513 alkali Substances 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 239000007767 bonding agent Substances 0.000 abstract 1
- -1 nitrogen anions Chemical class 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 230000000274 adsorptive effect Effects 0.000 description 9
- 238000000465 moulding Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 3
- 241000209140 Triticum Species 0.000 description 2
- 235000021307 Triticum Nutrition 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000012851 eutrophication Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000002594 sorbent Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- 241000237502 Ostreidae Species 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 235000020636 oyster Nutrition 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- OGWLTJRQYVEDMR-UHFFFAOYSA-F tetramagnesium;tetracarbonate Chemical compound [Mg+2].[Mg+2].[Mg+2].[Mg+2].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O OGWLTJRQYVEDMR-UHFFFAOYSA-F 0.000 description 1
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- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a preparation method of a modified and molded Mg-Al hydrotalcite and the application thereof. When in preparation, a mixed saline solution and a mixed aqueous alkali, containing Mg<2+> and Al<3+>, are respectively prepared and then mixed. Aging and crystallization are carried out after complete reaction, and the Mg-Al hydrotalcite is obtained after filtration, washing and drying; the Mg-Al hydrotalcite and a bonding agent are added into a magnesium saline solution and the pH value of the obtained paste is adjusted. After reaction, centrifugal separation, drying and extrusion molding are carried out, and then the paste is dried, roasted and cooled to the room temperature. When in adsorption and ion exchange, the product of the invention does not block a bed body andis easy for separation after reaction, suitable for the treatment of phosphorus and nitrogen anions in aqueous solution, water of a sewage disposal plant, seawater and breeding wastewater. A good treatment effect is available and an effluent standard can be met. Furthermore, after use, the product has better absorption effects after desorption and regeneration, thereby being beneficial to the realization of industrialized application.
Description
Technical field
The present invention relates to a kind of preparation method and application of magnesium aluminum-hydrotalcite of modification forming.
Background technology
The hydrotalcite that nature exists is the hydroxyl carbonated of magnesium, aluminium, is called magnesium aluminum-hydrotalcite again, and its theoretical molecular formula is Mg
6Al
2(OH)
16(CO
3) 4H
2O.Magnesium aluminum-hydrotalcite is a kind of anion type laminated compound, has unique negatively charged ion interchangeability, positively charged ion collocation property and bigger specific surface area, is occupying crucial status aspect absorption, ion-exchange and the catalysis.But at present to the research of magnesium aluminum-hydrotalcite with use and mainly be confined to powder morphology, exist suspended solid easily to stop up to be difficult to separate after a body, the reaction and can't realize deficiency such as regeneration, so magnesium aluminum-hydrotalcite is subjected to bigger restriction in actual applications.Therefore, realize the practical application of magnesium aluminum-hydrotalcite aspect absorption and ion-exchange, magnesium aluminum-hydrotalcite must be carried out effective modification forming, make it have certain mechanical strength.
Along with prominent the flying of industrial and agricultural production developed, a large amount of sanitary sewages, trade effluent and agrochemical flow into river, lake, and the phosphorus nitrogen content in the corresponding water body is increased, and excessive phosphorus nitrogen not only can cause body eutrophication, and meeting polluted underground water source, thereby HUMAN HEALTH is caused serious harm.But according to the latest report of Britain publication Freshwater Biology and U.S. publication PNAS, phosphorus is the deciding factor that causes eutrophication, and what play a role mainly is active phosphorus.At present, China municipal sewage plant more than 80% based on flocculation sediment and biological process, not good to the treatment effect of inorganic pollutants such as phosphorus nitrogen, want to reach the water quality emission standard, must pass through tertiary treatment.Therefore, effectively control and the advanced treatment that reduces the concentration of phosphorus nitrogen in the waste water and micropollutant water has become new problem in the modern sewage disposal, develop and develop efficient sewage water treatment method and have important practical significance.
Summary of the invention
The purpose of this invention is to provide a kind of preparation method and application of magnesium aluminum-hydrotalcite of modification forming, it can remedy the above-mentioned deficiency of prior art.
A kind of preparation method of magnesium aluminum-hydrotalcite of modification forming is characterized in that step is as follows: preparation contains Mg respectively
2+, Al
3+The mixed-salt aqueous solution and the mixed base aqueous solution, with the two mixing, question response wears out and crystallization after fully, after filtration, washing, drying obtain magnesium aluminum-hydrotalcite; This magnesium aluminum-hydrotalcite and binding agent are joined in the magnesium salt solution, the gram number that makes three kinds of solid quality sums is 1:5～15 with the ratio of the volume milliliter number of liquid, the pH value of regulating the gained soup compound is 9～12, reaction 15～180min, centrifugation, oven dry, extrusion moulding, 100～110 ℃ of oven dry down,, be cooled to room temperature then 350～700 ℃ of following roastings 1～4 hour.
The magnesium aluminum-hydrotalcite of above-mentioned modification forming is the application in the phosphorus nitrogen negatively charged ion in removing the aqueous solution, sewage work's water, seawater or breeding wastewater.
The magnesium aluminum-hydrotalcite of modification forming of the present invention is a kind of efficient sorbent material, is not easy to separate after a body, reaction are not stopped up in absorption during with ion-exchange and can realizes regenerating; Can solve the not good problem of phosphorus nitrogen treatment effect in the present water body, be applicable to the phosphorus nitrogen negatively charged ion in treating water solution, sewage work's water, seawater, the breeding wastewater, make it to reach emission standard, and stronger through adsorption effect behind the desorption and regeneration, lay a good foundation for realizing industrial applications.
Embodiment
Embodiment 1
The preparation method of the magnesium aluminum-hydrotalcite of modification forming
MgSO with 3000mol
4Al with 500mol
2(SO
4)
3(total amount is 4.0m to be mixed with mixed-salt aqueous solution
3), with the NaOH of 5000mol and the Na of 10000mol
2CO
3(total amount is 4.0m to be made into the mixed base aqueous solution
3), two kinds of aqueous solution are added complete mixing in the injection reactor by pipeline, control pH value is reacted under 8～9 condition, obtain oyster white pulpous state thing, directly add in the digestion tank and ceaselessly stirring this soup compound, after question response was complete, the seal aging jar was heated to 130 ℃, and to keep temperature be (130 ± 5) ℃, crystallization 24 hours adds plate-and-frame filter press with the material after the crystallization then, washs to filtrate with tap water and can not detect sulfate radical, this moment, pH value of filtrate was 7, material after will washing at last carries out spraying drying, and makes the import of spray-drying tower and temperature out remain on 300 ℃ and 120 ℃ respectively, obtains the magnesium aluminum-hydrotalcite of unmodified moulding; This magnesium aluminum-hydrotalcite and binding agent water glass are joined Mg (Ac)
2In the aqueous solution, making three kinds of solid mass ratioes is 47.5:2.5:50, and the gram number of three kinds of solid masses sums is 1:10 with the ratio of the milliliter number of liquid volume, uses NH
3H
2The pH value that O regulates above-mentioned soup compound is 10, react centrifugation after 1 hour, dry that pinch to hand can be agglomerating, make the cylindrical sorbent material that diameter is 2mm with the shaping of catalyst machine, 110 ℃ of oven dry down, then 350 ℃ of following roastings 3 hours, be cooled to the magnesium aluminum-hydrotalcite that obtains modification forming after the room temperature, preserve stand-by.
Above-mentioned MgSO
4And Al
2(SO
4)
3In the Mg/Al mol ratio be 2～3:1; Magnesium salts in the described magnesium salt solution can be MgCl
2, Mg (NO
3)
2, MgSO
4, Mg (Ac)
2, MgC
2O
4, MgCO
3, in the magnesium basic carbonate one or more; Described binding agent is silicon sol and/or water glass; Described magnesium aluminum-hydrotalcite, binding agent and three kinds of solid quality of magnesium salts are 5～99:0～10:1～95 than scope.
Embodiment 2
Unmodified moulding and magnesium aluminum-hydrotalcite modification forming remove the PO in the aqueous solution respectively
4 3-, P
3O
10 5-, NO
3 -, NO
2 -
With unmodified moulding with embodiment 1 in the magnesium aluminum-hydrotalcite of the modification forming that makes be that 1.1:10 is respectively charged in the adsorption column by blade diameter length ratio, adsorb respectively and remove PO in the aqueous solution
4 3-, P
3O
10 5-, NO
3 -, NO
2 -, their starting point concentrations separately are 50mg/L respectively in phosphorus or nitrogen, control the flow of this aqueous solution by adsorption column and are 5mL/min.Respectively according to national sewage comprehensive emission standard primary standard, national Drinking Water source quality primary standard and groundwater quality standard, with the concentration of phosphorus in the absorption rear solution is that the concentration of 0.5mg/L, nitre nitrogen is that the concentration of 10mg/L, nitrite nitrogen is the permission emission concentration of 1.0mg/L as phosphorus or nitrogen, be breakthrough point concentration, it is as shown in table 1 to obtain penetrating adsorptive capacity.Control is 5mL/min by the flow of adsorption column, removes PO
4 3-, P
3O
10 5-And NO
2 -After the magnesium aluminum-hydrotalcite of modification forming (remove NO with the NaOH of 0.1mol/L and the NaCl mixing solutions desorb of 3mol/L
3 -The back is with the NaOH desorb of 0.2mol/L) phosphorus or nitrogen concentration are constant substantially to the effluent liquid, contain 75g MgCl with 300mL then
2Aqueous solution regeneration after, reusable, it is as shown in table 1 to penetrate adsorptive capacity.
The magnesium aluminum-hydrotalcite of unmodified moulding of table 1 and modification forming is to PO in the aqueous solution
4 3-, P
3O
10 5-, NO
3 -, NO
2 -Penetrate adsorptive capacity (mg/g)
With PO
4 3-Be example, the magnesium aluminum-hydrotalcite of modification forming is to PO
4 3-To penetrate adsorptive capacity be 13.49mg/g the first time, the magnesium aluminum-hydrotalcite that is unmodified moulding is to PO
4 3-Penetrate more than 6 times of adsorptive capacity, and through behind twice of the desorption and regeneration, to PO
4 3-The adsorptive capacity that penetrates be 17.03 and 13.23mg/g.But find out the PO in the magnesium aluminum-hydrotalcite effective elimination aqueous solution of modification forming thus
4 3-, reusable behind desorption and regeneration, removal effect is strengthened to some extent.
Embodiment 3
The magnesium aluminum-hydrotalcite of modification forming removes the PO in the aqueous solution simultaneously
4 3-, P
3O
10 5-, NO
3 -, NO
2 -
Is that 1.1:15 packs in the adsorption column with the magnesium aluminum-hydrotalcite of the modification forming that makes among the embodiment 1 by blade diameter length ratio, removes the PO in the aqueous solution simultaneously
4 3-, P
3O
10 5-, NO
3 -, NO
2 -, their starting point concentrations separately are 25mg/L respectively in phosphorus or nitrogen, and the control aqueous solution is 5mL/min by the flow of adsorption column.Each ionic breakthrough concentration obtains PO as described in example 2 above
4 3-, P
3O
10 5-, NO
2 -Time of break-through be 95,75,75min, and NO
3 -In 300min, do not penetrate always.Find out that thus the magnesium aluminum-hydrotalcite behind the modification forming can remove the PO in the aqueous solution simultaneously
4 3-, P
3O
10 5-, NO
3 -, NO
2 -Owing to have the effect of intensive competitive adsorption between the various ions, make P
3O
10 5-And NO
2 -When 75min, at first penetrate adsorption column, but to PO
4 3-And NO
3 -Still have stronger adsorptive power,, several adsorption column series connection can be used, improve the service efficiency of adsorption column in order to make full use of adsorption column.
Embodiment 4
The magnesium aluminum-hydrotalcite of modification forming removes the PO in the waste water after sewage work's secondary treatment simultaneously
4 3-, NO
3 -
Is that 1.1:10 packs in the adsorption column with the magnesium aluminum-hydrotalcite of the modification forming that makes among the embodiment 1 by blade diameter length ratio, removes the PO in the waste water after sewage work's secondary treatment simultaneously
4 3-And NO
3 -, their starting point concentration is respectively in phosphorus or nitrogen, is respectively 4.61,2.97mg/L, and waste water is 5mL/min by the flow of adsorption column after the secondary treatment of control sewage work.Each ionic breakthrough point concentration obtains PO as described in example 2 above
4 3-, NO
3 -In 540min, do not penetrate always; Control is 5mL/min by the flow of adsorption column, the magnesium aluminum-hydrotalcite of the modification forming after the absorption with the NaCl mixing solutions of the NaOH of 0.1mol/L and 3mol/L separate be drawn in the effluent liquid phosphorus or nitrogen concentration constant substantially, contain 75g MgCl with 300mL then
2Aqueous solution regeneration after, to PO
4 3-Time of break-through be 450min, and NO
3 -In 540min, do not penetrate always.The magnesium aluminum-hydrotalcite that modification forming is described to sewage work's secondary treatment after PO in the waste water
4 3-And NO
3 -Have the ability that removes more by force, and reusable behind desorption and regeneration.
Embodiment 5
The magnesium aluminum-hydrotalcite of modification forming removes the PO in the seawater of different locations, Qingdao
4 3-
With the magnesium aluminum-hydrotalcite of the modification forming that makes among the embodiment 1 is that 1.1:10 packs in the adsorption column by blade diameter length ratio all, removes the PO in wheat island, good day of sunlight and the Olympic Sailing competition shoreline seawater respectively
4 3-, the starting point concentration in these three location seawater is respectively 1.818,1.10,0.526 μ mol/L in phosphorus, and the control seawater is 5mL/min by the flow of adsorption column.According to the seawater quality primary standard, be that 0.48 μ mol/L is as PO in the seawater with the concentration of adsorbing back phosphorus
4 3-Breakthrough point concentration, the PO of wheat island place wherein
4 3-The adsorptive capacity that penetrates be PO in good day and the Olympic Sailing competition shoreline seawater of 0.29 μ g/g, sunlight
4 3-In 5h, do not penetrate always.The PO of the magnesium aluminum-hydrotalcite of modification forming to lower concentration in the seawater in different locations, Qingdao is described
4 3-Has the ability that removes more by force.
Embodiment 6
The magnesium aluminum-hydrotalcite of modification forming removes the PO in the breeding wastewater
4 3-
With the magnesium aluminum-hydrotalcite behind the modification forming that makes among the embodiment 1 is that 1.1:10 packs in the adsorption column by blade diameter length ratio all, removes the PO in the breeding wastewater
4 3-, starting point concentration is 25mg/L, the flow of control breeding wastewater by adsorption column is 5mL/min, with the concentration of phosphorus in the breeding wastewater of absorption back be 0.5mg/L as breakthrough point concentration, obtaining penetrating adsorptive capacity is 17.35mg/g.The magnesium aluminum-hydrotalcite that modification forming is described is to the PO in the breeding wastewater
4 3-Has the ability that removes more by force.
Liquid is 3～7mL/min by the flow range of adsorption column in the foregoing description 2～6, and blade diameter length ratio is 1.1:5～15.Control is 5mL/min by the flow of adsorption column, the magnesium aluminum-hydrotalcite of the modification forming after the absorption with the NaCl mixing solutions of the NaOH of 0～0.5mol/L and 0～5mol/L separate be drawn in the effluent liquid phosphorus or nitrogen concentration constant substantially, contain 50～150g MgCl with 300mL then
2Aqueous solution regeneration back reusable, and regeneration back effect is strengthened.
Claims (4)
1. the preparation method of the magnesium aluminum-hydrotalcite of a modification forming is characterized in that step is as follows: prepare respectively and contain Mg
2+, Al
3+The mixed-salt aqueous solution and the mixed base aqueous solution, with the two mixing, question response wears out and crystallization after fully, after filtration, washing, drying obtain magnesium aluminum-hydrotalcite; This magnesium aluminum-hydrotalcite and binding agent are joined in the magnesium salt solution, the gram number that makes three kinds of solid quality sums is 1: 5～15 with the ratio of the volume milliliter number of liquid, the pH value of regulating the gained soup compound is 9～12, reaction 15～180min, centrifugation, oven dry, extrusion moulding, 100～110 ℃ of oven dry down,, be cooled to room temperature then 350～700 ℃ of following roastings 1～4 hour; Described binding agent is silicon sol and/or water glass.
2. the preparation method of the magnesium aluminum-hydrotalcite of modification forming as claimed in claim 1 is characterized in that the magnesium salts in the described magnesium salt solution is MgCl
2, Mg (Ac)
2, Mg (NO
3)
2, MgSO
4In one or more.
3. the preparation method of the magnesium aluminum-hydrotalcite of modification forming as claimed in claim 1 is characterized in that described magnesium aluminum-hydrotalcite, binding agent and three kinds of solid quality of magnesium salts are 5～99: 2.5～10 than scope: 1～95.
4. the magnesium aluminum-hydrotalcite of the described modification forming of claim 1 application in the phosphorus nitrogen negatively charged ion in removing the aqueous solution, sewage work's water, breeding wastewater.
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|---|---|---|---|
| CN2008101577612A CN101386424B (en) | 2008-10-14 | 2008-10-14 | Method for preparing modification forming magnalium hydrotalcite and application |
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| CN114259989A (en) * | 2022-01-07 | 2022-04-01 | 云南中烟工业有限责任公司 | Biological carbon aerogel loaded hydrotalcite material, and synthesis method and application thereof |
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| US20070208121A1 (en) * | 2003-12-22 | 2007-09-06 | Michel Foulon | Silica-Intercalated Hydrotalcite, And Use Thereof As Filler In Polymer Compositions |
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| CN108408852A (en) * | 2018-03-05 | 2018-08-17 | 南昌大学 | A kind of preparation method of richness magnesium tricalcium aluminate and its in biogas slurry of raising pigs nitrogen phosphorus ligands application |
| CN108408852B (en) * | 2018-03-05 | 2021-03-26 | 南昌大学 | A kind of preparation method of magnesium-rich tricalcium aluminate and its application in removing nitrogen and phosphorus in pig-raising biogas slurry |
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| CN101386424A (en) | 2009-03-18 |
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