CN116355615A - Heavy metal passivator of muscovite-based supported magnesium and preparation method and application thereof - Google Patents
Heavy metal passivator of muscovite-based supported magnesium and preparation method and application thereof Download PDFInfo
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- CN116355615A CN116355615A CN202310358774.0A CN202310358774A CN116355615A CN 116355615 A CN116355615 A CN 116355615A CN 202310358774 A CN202310358774 A CN 202310358774A CN 116355615 A CN116355615 A CN 116355615A
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- muscovite
- heavy metal
- magnesium
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- 229910052627 muscovite Inorganic materials 0.000 title claims abstract description 153
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 title claims abstract description 149
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 76
- 239000011777 magnesium Substances 0.000 title claims abstract description 57
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 69
- 238000001354 calcination Methods 0.000 claims abstract description 66
- 239000002689 soil Substances 0.000 claims abstract description 65
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 58
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000011591 potassium Substances 0.000 claims abstract description 32
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 32
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims description 39
- 229910052793 cadmium Inorganic materials 0.000 claims description 23
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical group [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 21
- 238000000227 grinding Methods 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 238000005067 remediation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- ZIXVIWRPMFITIT-UHFFFAOYSA-N cadmium lead Chemical compound [Cd].[Pb] ZIXVIWRPMFITIT-UHFFFAOYSA-N 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 239000006078 metal deactivator Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 21
- 238000002161 passivation Methods 0.000 abstract description 21
- 239000003337 fertilizer Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000013589 supplement Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 11
- 239000006228 supernatant Substances 0.000 description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 238000007873 sieving Methods 0.000 description 9
- 238000011282 treatment Methods 0.000 description 9
- 229910052618 mica group Inorganic materials 0.000 description 8
- 239000010445 mica Substances 0.000 description 7
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 5
- 239000001110 calcium chloride Substances 0.000 description 5
- 229910001628 calcium chloride Inorganic materials 0.000 description 5
- 238000009616 inductively coupled plasma Methods 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 229910052604 silicate mineral Inorganic materials 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 125000002091 cationic group Chemical group 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- 235000019341 magnesium sulphate Nutrition 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 229910001414 potassium ion Inorganic materials 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910021642 ultra pure water Inorganic materials 0.000 description 3
- 239000012498 ultrapure water Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 2
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- -1 and simultaneously Substances 0.000 description 2
- YKYOUMDCQGMQQO-UHFFFAOYSA-L cadmium dichloride Chemical compound Cl[Cd]Cl YKYOUMDCQGMQQO-UHFFFAOYSA-L 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 229940072033 potash Drugs 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 235000015320 potassium carbonate Nutrition 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910017121 AlSiO Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000007922 dissolution test Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005527 soil sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/08—Aluminium compounds, e.g. aluminium hydroxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
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- 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
- C02F2101/20—Heavy metals or heavy metal compounds
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- C09K2101/00—Agricultural use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pest Control & Pesticides (AREA)
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Abstract
The invention belongs to the field of restoration of heavy metal polluted water or heavy metal polluted soil, and particularly relates to a magnesium-loaded muscovite-based magnesium-loaded heavy metal passivating agent with a heavy metal passivation effect. The heavy metal passivating agent is characterized in that a muscovite matrix is loaded with magnesium element. The heavy metal passivating agent is obtained by uniformly mixing muscovite and magnesium chloride with water, drying, and calcining at 500-600 ℃. The heavy metal passivating agent with the potassium-rich mineral-muscovite as the matrix and loaded with the magnesium element can be used for passivating heavy metal elements in heavy metal soil or water, has a fertilizer function, and can supplement a proper amount of potassium fertilizer for soil. The heavy metal passivation material provided by the invention has the advantages of simple manufacturing method, low production cost, basically no pollution and good industrial applicability to acid soil.
Description
Technical Field
The invention belongs to the field of restoration of heavy metal polluted water or heavy metal polluted soil, and particularly relates to a magnesium-loaded muscovite-based magnesium-loaded heavy metal passivating agent with a heavy metal passivation effect.
Background
The prevention and treatment of heavy metal pollution of agricultural land soil and improvement of soil barren are important environmental problems which need to be solved at present. Heavy metal pollution in agricultural land is mainly caused by mining, sewage irrigation, atmospheric sedimentation, irregular application of pesticides and fertilizers, and the like. Compared with the heavy metal pollution type in the field, the cadmium and lead pollution type in the agricultural field has the characteristics of wide area, low degree and the like. The clay minerals are widely distributed and low in cost due to large specific surface area, and are widely applied to pollution control of soil heavy metals, such as kaolin, montmorillonite, attapulgite and the like. However, these clay minerals mainly rely on surface adsorption to fix heavy metals, and have the defects of poor passivation stability, large dosage, need of special silicate minerals, high raw material cost and the like.
The existing technology for repairing heavy metals is mainly aimed at soil in southern areas of China, one of the chemical principles of the technology is to increase the pH of the soil, and the aim of reducing the cadmium activity of the soil is fulfilled by increasing alkaline substances in the soil, because alkaline substances can generate alkaline precipitation with active cadmium ions after being hydrolyzed. This is a very suitable repair route for the pH of the southern soil, which is itself pH-biased. Furthermore, the increasing impoverishment of agricultural soils is a more interesting problem than the problem of lighter levels of heavy metal pollution in agricultural soils. The soil in China is generally lack of potassium, a large amount of potash fertilizer is imported in China every year to ensure normal agricultural production, and the existing silicate heavy metal polluted soil restoration agent has single function and basically has no function of supplementing potassium for the soil. Therefore, for the acid soil in the south, it is necessary to find a novel environment functional material which can improve soil acidification and fix cation heavy metals efficiently and has water and fertilizer retention performance.
Disclosure of Invention
In order to overcome the defect of single function of silicate mineral passivating materials in the prior art, the invention provides the heavy metal passivating agent which takes potassium-rich mineral-muscovite as a matrix and loads magnesium elements, which not only can be used for passivating heavy metal elements in heavy metal soil or water, but also has the fertilizer function, and can supplement a proper amount of potassium fertilizer for the soil. The heavy metal passivation material provided by the invention has the advantages of simple manufacturing method, low production cost, basically no pollution and good industrial applicability to acid soil.
The invention provides a heavy metal passivator of muscovite-based supported magnesium, which is characterized in that a muscovite matrix is supported with magnesium element. The heavy metal passivating agent is obtained by uniformly mixing muscovite and magnesium chloride with water, drying, and calcining at 500-600 ℃.
The invention provides a preparation method of a muscovite-based magnesium-loaded heavy metal passivating agent, which comprises the following steps:
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium chloride of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 160 ℃ for 2 hours;
4) And 3) calcining the dried muscovite and magnesium chloride mixed sample obtained in the step 3) at a low temperature, wherein the calcining temperature is 500-600 ℃, the calcining time is 3h, and the sample is taken out and ground to 200 meshes after the calcining is completed and cooled, so that the muscovite-based magnesium-loaded heavy metal passivating agent is obtained.
Preferably, the low temperature calcination temperature in step 4) is 550 ℃.
Further, the muscovite-based magnesium-loaded heavy metal passivating agent can be used for preparing heavy metal-containing sewage or heavy metal contaminated soil remediation agents; wherein the heavy metal species include, but are not limited to, cd, pb, cu, mn, ni and other cationic heavy metal pollution elements and the complex between the cationic heavy metal pollution elements.
Further, the muscovite-based magnesium-loaded heavy metal passivating agent can be used for preparing cadmium-containing sewage repairing medicaments, and the muscovite-based magnesium-loaded heavy metal passivating agent can be used for preparing lead-containing sewage repairing medicaments; the muscovite-based magnesium-loaded heavy metal passivating agent can be used for preparing a soil remediation agent containing cadmium or lead or cadmium-lead composite pollution.
Compared with the prior art, the invention has the beneficial effects that:
1) The white mica is used as a potassium-rich mineral, is widely distributed in nature, has high reserves, easily available raw materials and low cost, and has lower manufacturing cost compared with other silicate-based materials.
2) According to the invention, magnesium chloride is added into muscovite for low-temperature calcination, and the calcination temperature is obviously reduced compared with that of the traditional potash fertilizer industry, but the release of potassium element in muscovite can be improved, a small amount of potassium nutrient can be supplemented for soil, and simultaneously, magnesium element can be supplemented for soil.
3) The muscovite-based magnesium-loaded heavy metal passivating agent provided by the invention has mild alkalinity, has a pH value (placed in water) of about 9.5, is very suitable for acidic soil, can realize good fixation of Cd and Pb, can improve the environment of the acidic soil, can improve soil acidification and efficiently fix heavy metal cadmium and lead in water, and has the functions of water retention and fertilizer retention, thereby solving the problem that the traditional heavy metal repairing material has single functionality.
4) The muscovite-based magnesium-loaded heavy metal passivating agent provided by the invention can be used for soil and sewage polluted by cationic heavy metal, and can also be used for passivating heavy metal in other environmental media, including but not limited to slag, wetland, fly ash and the like.
Drawings
FIG. 1 is a flow chart of the preparation of a magnesium loaded heavy metal deactivator based on muscovite in example 1.
FIG. 2 shows example 1 and comparative example 1 (calcined only muscovite), and comparative example 2 (muscovite+CaCl) 2 ) Comparative example 3 (muscovite+MgSO) 4 ) And (3) a graph showing the change of the removal rate of Cd (II), namely the passivation rate, in the water body along with the dosage of the passivating agent.
FIG. 3 muscovite+MgCl 2 Removal efficiency of Cd (II) under different addition amounts after treatment at different calcination temperaturesGraph and change in corresponding pH.
FIG. 4 muscovite+MgCl 2 XRD crystal modifications after treatment at different calcination temperatures.
FIG. 5 muscovite+MgCl 2 The pH value of the sample after being treated by different calcining temperatures.
FIG. 6 shows the effect of the passivating agent prepared in example 1 on fixing Pb in a water body and the test result of dissolving out K ions.
FIG. 7 shows the results of the test for elution of potassium ions in pure water and citric acid, respectively, of the passivating agent prepared in example 1.
FIG. 8 test for evaluating passivation effect of the passivating agent prepared in example 1 on active Cd (II) in cadmium contaminated soil.
FIG. 9 is a sample plot of Henan Jiyuan cadmium-lead composite contaminated soil on site.
FIG. 10 is a photograph of cadmium-lead contaminated soil when air-dried in a laboratory.
Detailed Description
The invention is further described below in connection with specific examples, which are not intended to limit the scope of the invention.
Muscovite is a typical layered silicate mineral material belonging to the mica group and the muscovite subfamily, and has a crystal chemical formula of KAl [ AlSiO ] 3 O 10 ](OH) 2 . XRF (Axios advanced, henan) component analysis was performed on the muscovite component as follows.
TABLE 1 muscovite XRF component analysis Table
As is clear from Table 1, the muscovite minerals used in the present invention have a higher potassium element content. The muscovite ore used in each of the following examples was the muscovite ore having the above-mentioned composition.
Example 1 (para-muscovite+MgCl) 2 Calcining the mixture
A heavy metal passivator of muscovite-based load magnesium is characterized in that a muscovite matrix is loaded with magnesium element.
The preparation method of the muscovite-based magnesium-loaded heavy metal passivating agent comprises the following steps:
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium chloride of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 160 ℃ for 2 hours;
4) And 3) placing the dried muscovite and magnesium chloride mixed sample obtained in the step 3) into a tube furnace, performing low-temperature calcination, wherein the calcination temperature is 550 ℃, the calcination time is 3 hours, and taking out the sample and grinding the sample to 200 meshes after the calcination is completed and cooling to obtain the muscovite-based magnesium-loaded heavy metal passivator.
The preparation flow is shown in figure 1.
Comparative example 1 (Low temperature calcination of only raw white mica ore)
A muscovite-based soil passivating agent comprises only a muscovite matrix.
The preparation method of the muscovite-based soil passivating agent comprises the following steps:
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Drying the muscovite powder obtained in the step 1) for 2 hours at 160 ℃;
3) And 2) calcining the dried muscovite powder in the step 2) at a low temperature, wherein the calcining temperature is 550 ℃, the calcining time is 3 hours, and after the calcining is completed and cooling is finished, taking out a sample and grinding the sample to 200 meshes to obtain the muscovite powder which is subjected to the low-temperature calcining operation only, namely the muscovite-based soil passivating agent.
Comparative example 2 (para-muscovite + CaCl) 2 Calcining the mixture
A muscovite-based calcium-loaded heavy metal passivating agent is characterized in that a muscovite matrix is loaded with calcium element.
The preparation method of the muscovite-based calcium-loaded heavy metal passivating agent comprises the following steps:
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the calcium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to calcium element Ca in the calcium chloride of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 160 ℃ for 2 hours;
4) And 3) calcining the dried muscovite and calcium chloride mixed sample obtained in the step 3) at a low temperature, wherein the calcining temperature is 550 ℃, the calcining time is 3 hours, and the sample is taken out and ground to 200 meshes after the calcining is completed and cooled to obtain the muscovite-based heavy metal passivator loaded with calcium.
Comparative example 3 (para-muscovite + MgSO) 4 Is calcined from the mixture of (a) and (b)
A muscovite-based soil passivating agent is characterized in that a muscovite matrix is loaded with magnesium element.
The preparation method of the muscovite-based soil passivating agent comprises the following steps:
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium sulfate according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium sulfate of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 150 ℃ for 2 hours;
4) And 3) calcining the dried muscovite and magnesium sulfate mixed sample obtained in the step 3) at a low temperature, wherein the calcining temperature is 550 ℃, the calcining time is 3 hours, and the sample is taken out and ground to 200 meshes after the calcining is completed and cooled to obtain the muscovite-based soil passivating agent. Evaluation test of adsorption Performance of different passivating Agents on Cd (II) in Water (FIG. 2)
The test method comprises the following steps: the samples 0.2, 0.3, 0.4, 0.5, 0.7, 1.0g of the samples prepared in comparative example 1, comparative example 2, comparative example 3 were precisely weighed, respectively, and the samples were dosed with the sample containing the sample prepared from Cd (NO 3 ) 2 In the beaker of the prepared cadmium solution to be treated, the volume of the solution to be treated is 100ml, and Cd (NO 3 ) 2 Sealing the beaker with a concentration of 50ppm, placing on a magnetic stirrer, continuously stirring at room temperature and 250rpm for 120min, standing for 30min after the reaction is completed, taking out supernatant, passing through a 0.45 μm filter membrane, diluting the supernatant by a certain multiple, and performing concentration test on an inductively coupled plasma mass spectrometer (ICPMS, siemens X2) to obtain Cd remained in the solution after the passivating agent is added 2+ And subtracting the concentration from the concentration to be treated by the background to obtain the content of Cd passivated by the passivating agent, wherein the passivation efficiency of the passivating agent can be obtained by dividing the content of Cd passivated by the passivating agent by the concentration to be treated by the background. The test results are shown in FIG. 2.
As can be seen from the test results in FIG. 2, example 1 (muscovite+MgCl) 2 ) The passivation effect of the prepared passivating agent is obviously better than that of other treatments, and when the solid-to-liquid ratio is 0.5 g/100 ml, the passivation rate of cadmium reaches over 90 percent, which is far higher than that of comparative example 2 (muscovite+CaCl) 2 ) Treatment, comparative example 1 (calcined only muscovite raw ore), comparative example 3 (muscovite+mgso 4 ) The treatment shows that the improvement of the passivation rate of the white mica on the cadmium can be realized without randomly adding the magnesium salt into the white mica, the improvement of the passivation rate of the white mica on the cadmium is large as a whole, and the passivation effect of the sulfate is not realized, but the modification of the magnesium chloride and the calcium chloride which are the same elements also has great difference, and the passivation rate of the magnesium chloride modified white mica is higher than that of the calcium chloride along with the increase of the addition amount. The white mica-based magnesium-loaded heavy metal passivator prepared at different calcining temperatures has the removal rate of Cd in water and the change of pH value under different adding amounts (figure 3)
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium chloride of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 160 ℃ for 2 hours;
4) Placing the dried muscovite and magnesium chloride mixed sample obtained in the step 3) into a tube furnace, calcining at low temperature for 3h, selecting the calcining temperature of 300 ℃, 400 ℃, 500 ℃,550 ℃, 600 ℃, 700 ℃ and 800 ℃, taking out the sample after cooling the calcining, and grinding the sample to 200 meshes to obtain the finished product.
The prepared samples 0.2, 0.3, 0.5, 0.7, 0.9g were added with Cd (NO 3 ) 2 In the beaker of the prepared cadmium solution to be treated, the volume of the solution to be treated is 100ml, and Cd (NO 3 ) 2 Sealing the beaker with a concentration of 50ppm, placing on a magnetic stirrer, continuously stirring at room temperature and 250rpm for 120min, standing for 30min after the reaction is completed, taking out supernatant, passing through a 0.45 μm filter membrane, diluting the supernatant by a certain multiple, and performing concentration test on an inductively coupled plasma mass spectrometer (ICPMS, siemens X2) to obtain Cd remained in the solution after the passivating agent is added 2+ And subtracting the concentration from the concentration to be treated by the background to obtain the content of Cd passivated by the passivating agent, wherein the passivation efficiency of the passivating agent can be obtained by dividing the content of Cd passivated by the passivating agent by the concentration to be treated by the background. In addition, after the completion of the reaction and standing for 30 minutes, the pH value of the supernatant was measured by a pH meter. The test results are shown in FIG. 3.
The results show that the passivating agent prepared at 550 ℃ of calcination temperature has a removal effect on Cd of 80% or more when the addition amount is not less than 0.3g and the heavy metal passivating agent has a pH value of 8.5 or less, which indicates that the passivating agent has a removal effect on Cd of 80% or less when the pH value is about 8.5, because the components of the heavy metal passivating agent have a removal effect on Cd due to the fact that Cd (OH) is completely precipitated by hydroxide when Cd is completely removed by pH value 2 Ksp=7.20×10 -15 The optimum pH for precipitation is greater than 10.5. Further, the passivation effect of the passivation reagent sample prepared at the calcination temperature of 550 ℃ on heavy metals is better.
Calcining temperature vs. muscovite+MgCl 2 Impact analysis test of XRD of calcined product (FIG. 4)
The test method comprises the following steps: A. calcining muscovite at 300 ℃):
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Drying the muscovite powder obtained in the step 1) for 2 hours at 160 ℃;
3) And 2) calcining the dried muscovite powder in the step 2) at a low temperature, wherein the calcining temperature is 300 ℃, the calcining time is 3 hours, and taking out and grinding the sample to 200 meshes after the calcining is completed and cooling is carried out.
B. Calcining muscovite and MgCl at 300-550 DEG C 2 ：
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium chloride of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 160 ℃ for 2 hours;
4) And 3) placing the dried muscovite and magnesium chloride mixed sample obtained in the step 3) into a tube furnace, calcining at low temperature for 3h, selecting the calcining temperature at 300 ℃, 400 ℃, 500 ℃ and 550 ℃, taking out the sample after the calcining is completed and cooling, and grinding the sample to 200 meshes to obtain the finished product.
Calcining muscovite at 300deg.C, 300 deg.C, 400 deg.C, 500 deg.C and 550 deg.C, respectively 2 The sample prepared later is put into an X-ray diffractometer (Japanese No. Rigaku Ultimate IV type), the voltage is 40KV, the current is 40mA, the scanning range is 5-70 DEG for minerals, and the scanning speed is 5 DEG/min.
Muscovite+mgcl 2 XRD crystal modification after treatment at different calcination temperatures is shown in FIG. 4: at 300 ℃ under the reaction condition, mgCl 2 The crystal forms of the sample minerals before and after the reaction of the muscovite are compared, and MgCl is added 2 The reacted sample has obvious MgCl 2 ·6H 2 Characteristic peaks of O, which prove MgCl in the sample 2 ·6H 2 O (PDF # 25-0515) phase was present and Mg was evident 2 (OH) 3 Cl·4H 2 O (PDF#07-0412) phase,Mg 2 (OH) 3 Cl·4H 2 the presence of O in the sample demonstrated that the reaction did not reach equilibrium. As the temperature increases to 400℃Mg 2 (OH) 3 Cl·4H 2 The characteristic peak of O is weakened, and further Mg is added when the temperature is raised to 500 DEG C 2 (OH) 3 Cl·4H 2 The O characteristic peak disappeared but the possible MgCl remained 2 ·6H 2 Characteristic peaks of O. When the temperature is increased to 550 ℃, the characteristic peak of the muscovite still exists, the peak intensity ratio is higher than 500 ℃, and the 550 ℃ sample is proved to have the original silicate structure of the muscovite, and the reaction is more generated on the mineral surface. From XRD it can be essentially derived that: during the whole reaction process, muscovite and MgCl 2 ·6H 2 During the O reaction, mg is accompanied by 2 (OH) 3 Cl·4H 2 Participation of O-type phase, mg 2 (OH) 3 Cl·4H 2 The O-type phase provides a stronger alkaline environment for the activation of the muscovite in the low-temperature calcination process, improves the probability of breaking the muscovite interface structure and participating in the reaction, and provides a precondition for the dissolution of K element in the muscovite. Mg of 2 (OH) 3 Cl·4H 2 The O-type substance is decomposed with the rise of temperature, and the muscovite silicate basic structure is still remained at 550 ℃, and the silicate basic characteristics are still provided.
Calcination temperature effect test on passivating agent pH (FIG. 5)
Calcining muscovite and MgCl at 300-800 deg.C 2 ：
1) Crushing and grinding muscovite ore, and sieving with 200 mesh sieve to obtain muscovite powder for use;
2) Measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium chloride of K=2:1, adding water, stirring, and uniformly mixing;
3) Drying the mixture obtained in the step 2) at 160 ℃ for 2 hours;
4) Placing the dried muscovite and magnesium chloride mixed sample obtained in the step 3) into a tube furnace, calcining at low temperature for 3h, selecting the calcining temperature at 300 ℃, 400 ℃, 500 ℃, 600 ℃, 700 ℃ and 800 ℃, taking out the sample after cooling the calcining, and grinding the sample to 200 meshes to obtain the finished product.
0.1g of a sample at 300 ℃, 400 ℃, 500 ℃,550 ℃, 600 ℃, 700 ℃ and 800 ℃ calcined temperature was weighed accurately, placed in a beaker containing 100ml of ultrapure water, stirred on a magnetic stirrer (HJ-6A digital display magnetic heating stirrer, changzhou) for 30 minutes, and after stabilization, the pH value of the supernatant was measured by a pH meter (PHSJ-3F laboratory pH Ji Leici).
The test results show that the selection of the calcination temperature has a great influence on the pH of the passivating agent, as shown in figure 5, when the calcination temperature is lower, the pH of the product is higher, but the calcination may be insufficient, the magnesium loading is insufficient, and when the calcination temperature is higher, the pH is close to neutral, and the pH regulation effect on the acid soil is lost. In general, the calcination temperature is suitably selected from 500 to 600 ℃.
The effect of the passivating agent prepared in example 1 on Pb in water and the corresponding K ion dissolution test result (FIG. 6)
The test method comprises the following steps: example 1 (muscovite+MgCl) was weighed out in this order 2 ) The prepared samples 0.1g, 0.2g, 0.3g, 0.4g and 0.5g were respectively charged with Pb (NO 3 ) 2 In a beaker of the prepared lead solution to be treated, the volume of the lead solution to be treated was 100ml and the concentration was 50ppm. Sealing the beaker, placing on a magnetic stirrer, continuously stirring at room temperature and 250rpm for 120min, standing for 30min after the reaction is completed, taking out supernatant, passing through 0.45um filter membrane, diluting the supernatant by a certain multiple, and respectively performing Pb on inductively coupled plasma mass spectrometer (ICPMS, siemens X2) 2+ And corresponding K + Concentration test to obtain Pb remaining in solution after addition of passivating agent 2+ And subtracting the concentration from the concentration to be treated by the background to obtain the Pb content passivated by the passivating agent, wherein the passivation efficiency of the passivating agent can be obtained by dividing the Pb content passivated by the passivating agent by the concentration to be treated by the background. Measured K + The concentration is multiplied by the dilution multiple to calculate K + Actual dissolution concentration. As shown in particular in fig. 6.
The test result shows that the sample amount added is about 90 percent of the fixing effect on Pb when 0.5g is added, and the fixing effect is accompanied by K + Is demonstrated in example 1 (muscovite+MgCl) 2 ) For Pb in solution 2+ The fixing effect is high.
Evaluation test of K ion elution after modification (see FIG. 7)
The test method comprises the following steps: the prepared example 1 (muscovite+MgCl) was weighed in order 2 ) Each of the samples of comparative example 1 (calcined muscovite alone) was charged with 0.5g, and each of the samples was placed in a beaker containing 100ml of ultrapure water and 2% citric acid (for determination of the content of citrate-soluble potassium), and the beaker was sealed and then placed on a magnetic stirrer and stirred at 250rpm for 120 minutes to dissolve K in the sample as much as possible. And standing the reacted solution for 30min, and sequentially carrying out centrifugation, filtration and dilution steps, wherein the diluted solution is tested on an inductively coupled plasma mass spectrometer. The test results are shown in FIG. 7.
FIG. 7 shows that example 1 (muscovite+MgCl) 2 ) The dissolution of potassium in the solution is significantly higher than that of comparative example 1 (calcined muscovite alone) and the dissolution concentration in citric acid is as high as 48.27ppm, example 1 (muscovite+MgCl) provided by the present invention 2 ) The method can replace potassium in the muscovite and has the capability of providing a small amount of potassium fertilizer nutrient for soil, so that the defect that common silicate minerals only play a role in passivating heavy metals and have single functions is overcome, and convenience is provided for other restoration means such as phytoremediation after in-situ passivation restoration.
Passivation effect evaluation test of effective state Cd (II) in cadmium contaminated soil (see FIG. 8)
The test method comprises the following steps: the contaminated soil is collected from the agricultural land of cadmium contaminated soil area in Jiyuan, henan province, the pH of the soil is about 7.8, the soil sampling site is shown in figure 9, and after sampling, drying treatment is carried out at a cool and ventilated place selected in a laboratory, as shown in figure 10. The cadmium pollution concentrations were 27.22. Mu.g/kg, respectively. Example 1 (muscovite+MgCl) to be prepared 2 ) The materials are respectively added into cadmium polluted soil according to the addition amount of 1 percent and 3 percent, and blank soil without the passivating agent is used as a control experiment, namely the soil background concentration. Mixing, adding ultrapure water to control soil humidity to 5% (wt%), standing at room temperature for 10 days, air drying, and adding 0.01mol/L CaCl 2 And 0.5mol/LNaHCO 3 Extracting the soil effective state Cd. Sequentially extracting, centrifuging and filtering to obtain a supernatant, and testing the diluted supernatant on an inductively coupled plasma mass spectrometer. The test results are shown in FIG. 8.
As can be seen from the test results of FIG. 8, the cadmium contaminated soil with 1% of the passivating agent of example 1 has an effective state Cd (II) reduced from 27.22 μg/kg to 20.83 μg/kg, an effective state cadmium reduced by 23.48%, and a soil pH of 7.78; 3% of the soil polluted by cadmium after the passivating agent of the example 1 is added, the effective state Cd (II) contained in the soil is reduced from 27.22 mug/kg to 12.11 mug/kg, the effective state cadmium is reduced by 55.51%, and the pH value of the soil is 7.80; the addition of the heavy metal passivating agent prepared in the embodiment 1 has a good effect on the soil polluted by the weak alkaline heavy metal Cd (II). Therefore, mgCl provided by the invention 2 The modified muscovite-based cadmium-polluted soil passivating agent can play a good role in passivating the cadmium-polluted soil, and can be used for repairing the cadmium-polluted soil.
Explanation of the mechanism:
MgCl 2 ·6H 2 o reacts with water at different temperatures as shown in formula (1):
MgCl 2 ·6H 2 O＝Mg(OH)Cl+HCl+5H 2 o ≡ (temperature)>135 ℃ C. (1)
In muscovite and MgCl 2 ·6H 2 O is reacted for 2 hours at 150 ℃ or 160 ℃ to form MgCl 2 ·6H 2 O can generate MgOHCl phase, and is shown in figure 4, XRD phase analysis Mg 2 (OH) 3 Cl·4H 2 O and MgCl 2 ·6H 2 The characteristic peak of O exists, and as the temperature increases, mg 2 (OH) 3 Cl·4H 2 The characteristic peak of O disappears, and the overall alkalinity of the prepared sample is reduced (shown in figure 5), which proves that the muscovite and Mg 2 (OH) 3 Cl·4H 2 O is not simply mixed, but reacts with each other, and the alkalinity of a sample prepared at 550 ℃ is about 9.5. Under the combined action of basic magnesium chloride and magnesium chloride, K ions in the muscovite are dissolved out (shown in figures 6 and 7), and the concentration of citrate-soluble K ions can reach 48.27ppm (shown in figure 7); comprehensive XRD and potassium ion digestion data show that in low temperature stageWhen magnesium chloride or basic magnesium chloride and muscovite coexist, HCl released along with the temperature rise can undergo interfacial reaction with muscovite to generate substances such as KCl and the like, so that the alkalinity caused by potassium ion dissolution is gradually reduced to be neutral. After the treatment, the muscovite can obviously increase the capability of adsorbing and fixing heavy metals and can also provide the effect of potassium nutrients. The fixing effect of the product at 550 ℃ on the effective state Cd (II) in the soil (see figure 8), and the maximum fixing effect of the effective state Cd (II) in the soil can reach 55.51% at the adding amount of 3% (heavy metal passivating agent: soil (mass ratio)). The passivation mechanism of the experimental site is mainly influenced by the pH value at present, and the muscovite is exchanged with Cd through K dissolution and is more likely to precipitate in the form of alkali cadmium chloride.
The above description is only of the preferred embodiments of the present application, and is not intended to limit the present application in any way, and any person skilled in the art may make various changes or modifications equivalent to the equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solutions of the present application, which falls within the scope of the present application.
Claims (7)
1. The heavy metal passivating agent is characterized in that a magnesium element is loaded on a muscovite matrix, and the heavy metal passivating agent is obtained by uniformly mixing muscovite and magnesium chloride with water, drying and then calcining at 500-600 ℃.
2. The magnesium-loaded heavy metal passivator according to claim 1, wherein the ratio of potassium element in the muscovite to magnesium element Mg in the magnesium chloride is stoichiometric when mixed uniformly is k=2:1.
3. The preparation method of the muscovite-based magnesium-loaded heavy metal passivating agent is characterized by comprising the following steps of:
step 1: crushing and grinding muscovite ore to obtain muscovite powder for later use;
step 2: measuring the content of potassium element in the muscovite powder, respectively weighing the muscovite powder and the magnesium chloride according to the stoichiometric ratio of potassium element in the muscovite powder to magnesium element Mg in the magnesium chloride of K=2:1, adding water, stirring, and uniformly mixing;
step 3: drying the mixture obtained in the step 2 for 2 hours at 150-160 ℃;
step 4: and (3) calcining the muscovite and magnesium chloride mixed sample dried in the step (3) for 3 hours at a low temperature, wherein the calcining temperature is 500-600 ℃, taking out the sample after the calcining is completed and cooling, and grinding to obtain the muscovite-based magnesium-loaded heavy metal passivator.
4. A method for preparing a magnesium loaded heavy metal deactivator based on muscovite according to claim 3, wherein the grinding in step 1 and in step 4 is aimed at grinding to 200 mesh.
5. The method for preparing a magnesium loaded heavy metal passivating agent based on muscovite according to claim 3, wherein the low-temperature calcination temperature in the step 4 is 550 ℃.
6. The application of the muscovite-based magnesium-loaded heavy metal passivating agent as defined in claim 1 or 2 or the heavy metal passivating agent prepared by the method as defined in any one of claims 3 to 5 in the preparation of heavy metal-containing sewage or heavy metal contaminated soil remediation agents, wherein the heavy metal comprises Cd, pb, cu, mn and/or Ni.
7. The use according to claim 6, wherein the agent is a cadmium-containing sewage remediation agent, a lead-containing sewage remediation agent, or a cadmium-containing or lead-containing or cadmium-lead composite contaminated soil remediation agent.
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