92results about How to "Reduce the effective content" patented technology

The invention discloses a restoration agent for lowering cadmium / lead effective state content in soil, which is composed of quicklime, calcium sulfate, wood charcoal, iron chloride and water, wherein the weight ratio of the quicklime, calcium sulfate, wood charcoal and iron chloride is (1-2):(1-2):(1-2):(0.5-1), and the water accounts for 30-45 wt% of the soil. The restoration agent can be used for treating heavily polluted soil; and common chemical passivators can only restore lightly polluted soil, and do not have obvious effect on heavy pollution. The restoration agent can be used for treating both acidic soil and neutral soil. The restoration agent has high remediation efficiency for cadmium polluted soil; the reaction mechanisms relate to chemical precipitation and physical adsorption; and when one action fails due to change of the outside conditions, the other action can perform the guarantee function. The restoration agent has certain control actions on the lead effective state content in the polluted soil.

The invention discloses a resource utilization method of plant bamboo reed after restoring heavy metal contaminated soil. The method comprises the following steps: air-drying and crushing the harvested plant bamboo reed used for restoring heavy metal contaminated soil, adding a catalytic modifier under a condition of controlling oxygen atmosphere, calcining the plant bamboo reed at 200-800 DEG C for 0.5-4 h, and cooling the plant bamboo reed to obtain charcoal, wherein the yield of the bamboo reed charcoal is 25-75%. When the bamboo reed charcoal is used for adsorbing heavy metals and compounds thereof in contaminated soil, wastewater or waste gases, the adsorption capacity reaches 0.4-6.0 mg / g; meanwhile, the bamboo reed charcoal can be used as an energy source raw material or a reducing agent to be comprehensively utilized by metallurgy enterprises. The invention provides an engineering approach for biomass resource utilization of contaminated soil restoring plants and solving the problem of potential secondary pollution.

The invention discloses a microorganism passivator for repairing heavy metal pollution of soil and preparation and application thereof. A preparing method comprises the steps of fermentation and adsorption of strains. Specifically, bacteria solutions obtained after fermentation of bacillus megateriumvar.phosphaticum and bacillus subtilis LVLE-14 are mixed in proportion, then adsorption is conducted by means of a special adsorption carrier, and then mixing and smashing are conducted to obtain the microorganism passivator. The adsorption carrier comprises hydrolysis residues and biochar which are mixed and smashed according to a certain mass ratio. By the adoption of the microorganism passivator for repairing heavy metal pollution of soil, the content of available heavy metals in soil can be effectively reduced, and the number of microbial populations and plant yield are increased greatly. The method for repairing heavy metal pollution of soil by means of the microorganism passivator is in-situ repair, operation is easy, the cost is low, and industrialized implementation can be easily achieved; furthermore, the repairing effect is good, soil fertility can not be damaged, and the utilization rate of resources can be increased.

The invention discloses a fixed enrichment method for city life compost heavy metals through modified nanocarbon. The fixed enrichment method comprises the following steps: modifying the modified nanocarbon with the grain diameter of 20-70nm before being applied so as to obtain various types of modified nanocarbon; then sealing a layer of cotton cloth and a nylon net at the lower end of a PVC (polyvinyl chloride) tube, uniformly and proportionally mixing garbage compost with the modified nanocarbon, wherein each tube is filled with150g of a mixed material; setting the temperature during experiments to be 19-27 DEG C and the relative humidity to be 60% to 72%, and supplementing water for the compost every day, so that the content of water of the compost reaches about 70% of field moisture capacity; sampling 45d for cultivation later, and carrying out morphological analysis on the heavy metals, wherein the addition of the modified nanocarbon is 1-5%(w / w) of the weight of the garbage compost. Experimental results show that the modified nanocarbon is added so that the contents of the heavy metals in a residual form are increased, the conversion of the compost heavy metals from a plant easily-absorbed state to a difficultly-absorbed state is promoted, and the method provides a basis for the application of the modified nanocarbon on passivation and plant enrichment of the heavy metals in garbage compost.

The invention provides a compound conditioner suitable for heavy metal pollution of northern alkaline soil. The compound conditioner comprises biochar, organic fertilizers, microbial agents and phosphate rock powder, wherein a mass ratio of the biochar to the organic fertilizers to the microbial agents and the phosphate rock powder is (40-65): (30-50): (3-5):(10-25). On account of physical and chemical properties of the northern alkaline soil and characteristics of heavy metal elements, the invention provides the compound conditioner having functions of improving the physical and chemical properties of soil, preventing and treating soil-borne diseases and passivating heavy metals cadmium and lead, as well as a preparation method and a use method of the compound conditioner on the basis ofa current passivation technology by utilizing adsorptive precipitation performance of the biochar, the organic fertilizers and the phosphate rock powder and bacteria inhibiting, phosphorus decomposingand heavy metal passivating capacities of bacilli.

The invention discloses a cross-linked polymer system heat stabilizer for water shutoff and profile control, and a preparation method and application thereof, wherein the heat stabilizer is composed of the following components in parts by weight: 2-8 parts of sodium thiosulfate, 30-50 parts of polyethylene glycol, 10-30 parts of urea, 1-5 parts of formaldehyde and 800-1200 parts of de-ionized water. All of the components are evenly mixed to obtain the heat stabilizer which is used as a cross-linked polymer system common in water shutoff and profile control or profile control and displacement of the oil field; and the cross-linked polymer system is composed of polyacrylamide aqueous solution and a phenolic resin cross-linking agent or organic chromium cross-linking agent. The thiourea or sodium thiosulfate of the heat stabilizer provided by the invention serves as the deoxidant, the polyethylene glycol or the urea serves as the complexing stabilizer, and the formaldehyde serves as the complexing stabilizer and the bactericide; the method for preparing the cross-linked polymer system heat stabilizer is simple and the use cost is also low; therefore, the strength and the stability of the cross-linked system both can be well improved.

The invention relates to a preparation method of more stable vitamin A microcapsules, comprising the following steps of: firstly, preparing a vitamin A oil solution containing an antioxidant from vitamin A and the antioxidant in the absence of oxygen, adding chitosan and stirring evenly, after stirring fully, filtering and removing the chitosan to obtain the vitamin A oil solution; adding octenyl succinic acid modified starch to purified water deaerated by a thermal spray deaerator, heating for dissolution; mixing the prepared octenyl succinic acid modified starch solution and the vitamin A oil solution in a certain proportion, emulsifying quickly by an on-line emulsifying machine, and instantly cooling by a cooler; and performing hot air spray drying on the emulsion to obtain stable vitamin A microcapsules. The storage life of the product prepared in the invention reaches two years.

The invention discloses a polypeptide for inhibiting aggregation and toxicity of beta amyloid protein (A beta) or a variant of the polypeptide with polypeptide functions. The polypeptide has a strong binding force with the A beta protein, so that the effective content of a beta structure can be greatly reduced when A beta achieves an aggregation balanced state, the secondary structure of A beta in a solution environment can be changed, the content of the beta structure can be greatly reduced, even the beta structure disappears, the toxicity of A beta to SH-SY5Y cells can be remarkably reduced when the concentration of the polypeptide is extremely low, and generation of A beta-induced active oxygen can be greatly inhibited. Therefore, a feasible method is provided to treatment of Alzheimer disease caused by beta amyloid protein, and thought and reference standard can be provided to discovery of polypeptide pilot compounds for treatment of amyloid protein related diseases.

The invention discloses a method for hindering the absorption of heavy metal by a plant. Modifying agent is applied to soil; the modifying agent is the combination of red mud, apatite and selenium; and the dosage of the red mud, the apatite and the selenium is as follows: 5-100g of red mud, 5-100g of apatite and 0.5-1mg of selenium are applied to 1kg of soil. According to the application of the combined modifying agent, the effective state of heavy metals in the soil can be lowered to achieve a purpose of fixedly precipitating the heavy metals so as to greatly lower the content of the heavy metals, such as cadmium, copper, lead, zinc and arsenic in plants, the plant biomass can be increased, and a technical guarantee is provided for the grain production safety of a heavy metal contaminated region.

The invention discloses a heavy metal passivator for reducing the bio-availability of cadmium in soil. The heavy metal passivator is prepared by mixing the following components in percentage by weight: 70 to 90 percent of biochar and 10 to 30 percent of modified sodium alginate. The heavy metal passivator disclosed by the invention not only has a function of passivating the heavy metal in the soil in situ, but also is capable of improving the soil structure and increasing the soil porosity, the pH (Potential of Hydrogen) of the soil is increased to a larger extent, and the function of repairing acidified soil is also obtained.

The invention discloses a sludge treatment method and an agricultural sludge biochar acquired by adopting the method. The agricultural sludge biochar is mainly prepared through low-temperature oxygen-limited decomposition of organic and inorganic antidotes and citizen sludge which are uniformly mixed, and the antidotes accounts for 3%-20% of the amount of dry matter of the citizen sludge. With the adoption of the sludge treatment method, activity and total amount of heavy metal in a carbonized product can be effectively reduced, pathogenic bacteria are killed, organic pollutants such as polycyclic aromatic hydrocarbon and the like are eliminated, and nutrients can be maintained to the greatest extent, so that the product is applicable to the plantation fields such as agriculture, forestry and the like.

The invention relates to the technical field of repair of heavy metal contaminated soil, in particular to a passivating agent used for treating lead-cadmium compound contaminated soil as well as a preparation method thereof and a using method thereof. The passivating agent is prepared by compounding sepiolite and phosphor-containing substances. The preparation method for the passivating agent comprises the following steps: mixing acidic modified sepiolite, calcium dihydrogen phosphate and phosphorite powder, and uniformly mixing to obtain the passivating agent. The using method for the passivating agent comprises the following steps: pre-treating the lead-cadmium compound contaminated soil, performing air-drying on the contaminated soil, grinding the contaminated soil, enabling the grinded contaminated soil to pass through a 20-mesh sieve, adding the passivating agent into the pre-treated contaminated soil, adding water to uniformly mix, maintaining the uniformly mixed soil in situ, and enabling the passivating agent to sufficiently react with heavy metals in the soil. The passivating agent provided by the invention is low in raw material cost, is high in passivating efficiency, is stable in effect, and is suitable for farmland treatment with great Pb and Cd contaminated area and light contamination degree.

Belonging to the technical field of contaminated soil remediation, the invention particularly relates to an improvement method of extremely acidified mine soil. The method utilizes an improving agentand a microbial agent to change the microbial community structure of soil, especially reduce the relative abundance of iron-sulfur oxidation acid production microorganisms and inhibit metal sulfide from oxidizing and producing acid. The improving agent can be utilized for adsorption, chelation, complexing and immobilization of heavy metal ions and reduction of the biological toxicity, thus reducing the diffusion and leakage of heavy metal ions to surrounding soil or water. The improvement method provided by the invention has the advantages of low investment cost, good acidification control andheavy metal stabilization effect, substantial increase of nutrient content, no destruction of the soil structure, and easy implementation.

The invention discloses a composting method capable of efficiently degrading antibiotics in livestock excrements. Degradation of a plurality of antibiotics, such as sulfonamides, tetracyclines, macrolides and fluoroquinolones, in a compost can be obviously promoted by adding an antibiotic degradation promoter with a specific using amount into a composting raw material and using specific composting steps, and meanwhile, available heavy metal content in the compost is reduced. The antibiotic degradation promoter consists of an activated carbon and an attapulgite, and can also be used with a biological activated carbon comprising the activated carbon and phanerochaete chrysosporium.

The invention discloses a method for reducing the bioavailability of soil with combined heavy metal pollution. The method comprises the following steps: subjecting the soil with combined heavy metal pollution to air drying, sieving and preservation; with agricultural and forestry residues as raw materials, preparing biochar particles, and carrying out crushing, screening, air drying or stoving, and preservation; mixing the screened dried biochar particles and the soil with combined heavy metal pollution in a weight ratio of 1: 20 to 1: 100 under stirring, adding distilled water to allow the water content of the obtained mixture to reach 50 to 70% of field moisture capacity, and subjecting the mixture to standing for 5 to 7 days to allow the mixture to be fully decomposed so as to prepare achar-soil mixture with combined heavy metal pollution; and transplanting tobacco seedlings into the char-soil mixture by using a well cellar seedling transplanting method, uniformly filling the wellcellar with the mixture and allowing the growing points of the tobacco seedlings to main exposed. The method provided by the invention substantially reduces the available contents of Cd and Pb in thesoil with combined heavy metal pollution and lower absorption and enrichment of the heavy metals Cd and Pb by the roots, stems and leaves of crops; and the method has the advantages of low cost, highefficiency, simple operation and easy promotion and application.

The invention discloses micro-nano structure hydroxyapatite and a preparing method and application thereof. The hydroxyapatite is of a microsphere structure, and the surfaces of the hydroxyapatite microspheres are provided with nanorods. The specific surface area of the hydroxyapatite microspheres with the surfaces provided with the nanorods is larger than or equal to 192 m<2> / g, the spherical diameter of the microspheres ranges from 3 microns to 5 microns, the diameter of the nanorods ranges from 5 nm to 15 nm, and the length of the nanorods ranges from10 nm to 100 nm. The preparing method includes the steps that after a calcium solution and a phosphorus solution are stirred and mixed according to the molar ratio (please see the specification) of 1:(1.4-1.8), adjustment is carried out through hydrochloric acid or nitric acid to obtain clear liquid; after a chelating agent and urea are added into the clear liquid, a surface active agent is added into the obtained mixed liquid to obtain precursor liquid; the precursor liquid is reacted at the temperature of 80-95 DEG C and subjected to standing and aging, and reaction liquid with sediments is obtained; the reaction liquid with the sediments is subjected to solid-liquid separation and washing treatment, and a target product is obtained. The micro-nano structure hydroxyapatite can be widely used for governing and repairing soil polluted by heavy metal.

The invention discloses a soil conditioner and a preparation method thereof. The soil conditioner comprises 40%-80% of charcoal powder, 0-30% of zeolite powder, 0-30% of lime powder and 10%-20% of montmorillonite powder.

The invention relates to aluminum alloy and provides high-strength aluminum alloy with the tensile strength of more than 700MPa and a preparation method thereof. The high-strength aluminum alloy comprises the following raw materials in percentage by weight: 0.10%-0.14% of Fe, 0.03%-0.04% of Mn, 0.02%-0.04% of Si, 0.01%-0.06% of Ti, 0.03%-0.09% of B, 2.2%-2.9% of Zn, 0.9%-1.0% of Mg, 1.1%-1.3% of Cu, 0.5%-1.0% of Ce, 0.1%-0.4% of Sc and the balance of Al.

The invention discloses a method for repairing soil contaminated by uranium tailings uranium and associated heavy metal by passivation of phosphorous-containing compounds. The method for repairing thesoil contaminated by uranium tailings uranium and associated heavy metal by passivation of the phosphorous-containing compounds comprises the steps that step one, phosphorous-containing compounds screening is carried out; step two, uranium tailings contaminated soil uranium and associated heavy metal passivation treatment is carried out; and step three, plants with uranium and associated heavy metal tolerance, small amount of enrichment and mainly enrichment in roots are screened and utilized, the plants are cultivated according to various varieties planting requirements, contents of a uranium and associated heavy metal effective state in uranium and associated heavy metal low concentration contaminated areas can be reduced, and agricultural products with edible safety are harvested and better earnings are obtained.

The invention discloses an ammonium oxalate modified phosphate tailing adsorbing material for repairing heavy metal polluted water and soil and a preparation method and application thereof. The preparation method of the material comprises the following steps: mixing pretreated phosphate tailings with an ammonium oxalate solution, reacting the mixture at 25-35 DEG C for 4-8 days, drying the mixtureat 90-100 DEG C for 6-48 hours until the mixture is completely dried, cooling the dried mixture to room temperature, and grinding the cooled mixture to obtain the material. The preparation method ofthe material is simple in process, simple in required equipment and low in preparation cost. The ammonium oxalate modified phosphate tailings not only can adsorb heavy metal ions such as lead, copper,cadmium, zinc and nickel in a solution and treat water pollution, but also can passivate heavy metals such as lead and cadmium in heavy metal contaminated soil, reduce the effectiveness of the heavymetals and improve the physicochemical properties of the soil, and have a wide application prospect.

The invention discloses a biochar-based bacterial composite soil conditioner as well as preparation and application thereof. A preparation method comprises the following steps: (1) domestication of bacteria: sequentially inoculating bacillus cereus, ochrobactrum sp. and arthrobacter sp. into a Cd-containing inorganic salt culture solution with a gradient concentration respectively for domestication and cultivation; and mixing the domesticated and cultured bacterial solutions to prepare a bacterial suspension for later use; and (2) preparation of the biochar-based bacterial composite soil conditioner: taking biochar to be mixed with the bacterial suspension, adding antagonistic elements of heavy metals in soil, then performing shaking cultivation, filtering and washing. The biochar-based bacterial composite soil conditioner provided by the invention is simple in preparation method and low in cost; microorganisms in the preparation have high tolerance to the heavy metal Cd, so that the preparation has good remediation effect on the heavy metals in the soil, and is stable, long-acting, and less affected by the environment; the invention is an in-situ chemistry-combined microbial passivation remediation technology effectively applied to heavy metal-contaminated soil in farmlands.

The invention discloses a method for improving hard water resistance of magnesium aluminum silicate inorganic gel. The method comprises steps as follows: (1) adding a modifier to a powdered magnesium aluminum silicate inorganic gel, wherein the modifier is selected from one or more of sodium carbonate, sodium fluoride, sodium phosphate, sodium oxalate, sodium citrate and sodium ethylene diaminetetraacetic acid; (2) after full stirring, heating the gel to the temperature of 30-80 DEG C for 5-20 min while stirring; (3) cooling the gel to the room temperature to obtain the modified magnesium aluminum silicate product. A 1% standard hard water dispersion system is prepared fromthe modified inorganic gel product prepared with the method, and the precipitation quantity of clear water is obviously reduced or even no clear water is precipitatedafter the system is left to stand for 24 h, so that the gel has excellent suspension property in the hard water system, and the problem that existing magnesium aluminum silicate inorganic gel cannot be applied to hard water is solved.

The invention relates to a cadmium-lead contaminated farmland passivation and low-accumulation plant repairing method. The repairing method comprises the following steps: (1) sieving and roasting a passivating agent LDHs, and then uniformly spreading the passivating agent LDHs onto plowed cadmium and / or lead contaminated soil by using a manure spreader in batches, wherein 200-600kg of passivatingagent LDHs is applied to per mu of cadmium and / or lead contaminated soil; and step (2) sowing low accumulation corn varieties to the soil treated in the step (1), germinating, surviving, growing, absorbing the metal cadmium and / or lead in the contaminated soil by the passivating agent and corn root systems, and transferring the metal cadmium and / or lead to the overground part. The repairing methodhas the advantage that the safe production of agricultural products is realized by utilizing a heavy metal contaminated farmland passivation and low accumulation corn crop combined repairing technology.

The invention provides a hydroxyapatite / activated carbon efficient soil conditioner and application thereof, and relates to the technical field of soil conditioners. The efficient soil conditioner isprepared from the following raw materials in parts by weight: 20-28 parts of hydroxyapatite powder, 10-15 parts of rice hull activated carbon, 7-12 parts of coconut shell activated carbon, 7-13 partsof plant ash, 6-11 parts of straw, 10-15 parts of tomato pomace, 6-10 parts of animal waste, 0.2-0.3 part of compound microbial agent and 5-11 parts of dolomite. The soil conditioner is green and environment-friendly and low in cost and can effectively reduce the effective state content of each heavy metal in soil and improves the pH value of acidic soil and is good in fertilizer retention and moisture retention effects and high in organic matter content and greatly improves the soil structure and ecological environment of the acidic soil and has a good effect on improving the acidic soil andrepairing the acidic heavy metal contaminated soil.

The invention belongs to the technical field of soil protection, and particularly relates to a cadmium-arsenic compound contaminated soil restoration amendment agent and a preparation method and application thereof. The provided amendment agent comprises modified vermiculite, modified bio-char and modified sepiolite, has simple composition and good adsorption effect, can maintain the pH of the soil in a relatively stable range, and can effectively reduce the variation amplitude of the soil pH, the comprehensive restoration of the cadmium-arsenic compound pollution can be achieved through the compounding of the three materials, and the soil fertility is not affected. The modified vermiculite has relatively high pH buffering ability, so that the problem that sepiolite tends to increase the pH value of the soil and the iron-modified bio-char tends to lower the pH value of the soil can be slowed down. The bio-char is rich in functional groups, and the iron-modified bio-char has relativelygood curing and stabilizing effects on arsenic. The sepiolite is a chain-like transition structure composed of parallel crystal layers, the adjacent crystal layers are arranged alternately to form micro-porous channels, so that the sepiolite has strong adsorption, decolorization, dispersion and other properties.

The invention discloses a method using catalytic oxidation of sulfur dioxide tail gas for a PH adjustment agent of phosphate rock ore dressing. According to the method, soluble iron (III), germanium (IV) and other metal ions in raw phosphate rock pulp are used as catalysts, copper (II) ions play a synergistic effect, a trace buffer is added; countercurrent contact, in a dynamic wave desulphurization tower, with the sulfur dioxide tail gas out from an absorption tower is realized, and after sulfur dioxide is absorbed, a sulfuric acid solution is formed for decomposition of the phosphate rock pulp; phosphoric acid formed by the decomposition of the phosphate rock pulp can be used as the PH adjustment agent in phosphate rock ore flotation selection, and a mineralization coupling technology of phosphorus chemical industry and phosphate rock ore dressing can be achieved. The tail gas processed by desulphurization can reach an emission standard of less than or equal to 400mg / m<3> of tail gas of the new national standard. The purification method of the sulfur dioxide tail gas in sulfuric acid production has the advantages of simple process and strong applicability, can achieve the mineralization coupling technology of phosphorus chemical industry and phosphate rock ore dressing, and has great significance in the points of view of both resources and environmental protection.

The invention discloses a polycrystalline silicon reduction furnace raw material gas feeding amount controller. A polycrystalline silicon reduction furnace comprises an air inlet and a gas outlet. The fed raw material gas comprises tail gas discharged by the polycrystalline silicon reduction furnace, newly fed trichlorosilane and newly fed hydrogen. The tail gas comprises tail gas trichlorosilane, tail gas hydrogen chloride and tail gas hydrogen. The controller comprises a detection mechanism for detecting mole content of hydrogen chloride in tail gas, a raw material gas feeding mechanism and a master controller. The detection mechanism for detecting mole content of hydrogen chloride in tail gas is electrically connected to the master controller. The raw material gas feeding mechanism is electrically connected to the master controller. The controller realizes on-line automatic control of a mole amount of tail gas fed into the reduction furnace, is free of personnel monitoring, keeps a ratio of trichlorosilane to hydrogen chloride in the reduction furnace in a normal high efficiency production reasonable scope by timely change of a used tail gas amount in polycrystalline silicon reduction furnace production so that the tail gas is reasonably used to a highest degree.

The invention belongs to the technical field of soil remediation agents, and discloses a heavy metal contaminated soil remediation agent. The heavy metal contaminated soil remediation agent comprises,by weight, 30-50 parts of modified fly ash, 20-30 parts of modified kaolinite, 10-20 parts of oxidized nanometer carbon black, 10-15 parts of biochemical fulvic acid, 3-8 parts of sodium thiosulfateand 5-10 parts of a microbial agent. The invention also discloses a preparation method of the heavy metal contaminated soil remediation agent. The preparation method comprises the following steps: (1)uniformly mixing weighed modified fly ash, modified kaolinite, oxidized nanometer carbon black, biochemical fulvic acid and sodium thiosulfate, feeding the obtained mixture into a granulator, addinga proper amount of water vapor, granulating, and drying for later use; and (2) adding the microbial agent into obtained particles, uniformly mixing, feeding the obtained mixture into a granulator, adding a proper amount of water vapor, granulating, and drying to obtain the soil remediation agent. An inorganic passivator and microorganisms are combined for use, and heavy metal ions are rapidly andefficiently fixed through the inorganic passivator; and the microbial agent is added, so that the leaching concentration of heavy metals is reduced, and the heavy metal contaminated soil is improved.

The invention discloses a soil remediation method based on modified attapulgite clay. The method comprises the following steps of S1, sampling attapulgite clay raw materials, smashing the attapulgiteclay through a smashing device, and then, adding diluted ammonium hydroxide, a dioctyl sebacate solution, a carbon base material and a remediation solution, wherein the addition mass percentage of diluted ammonium hydroxide is 0.8-1.0%, the addition mass percentage of the dioctyl sebacate solution is 1.0-1.2%, the addition mass percentage of the carbon base material is 0.8-1.5%, and the addition mass percentage of the remediation solution is 0.2-0.3%. The invention relates to the technical field of soil remediation. According to the soil remediation method based on modified attapulgite clay, the modified attapulgite clay is adopted as a soil remediation agent, a layer which is high in adsorption capability, high in adoration rate and capable of effectively adsorbing heavy metal ions in soil can be formed below a contaminated soil layer, the soil remediation solution is sprayed, plants grow to have deep roots and luxuriant leaves, chlorophyll is enhanced, nutrients are abundant, and normal juice and normal taste are recovered; soil contaminations are reduced, and the method is low in carbon and environmentally friendly and no water or fertilizer soil is lost.

The invention provides a soil passivator, a preparation method thereof and application of the soil passivator in farmland heavy metal pollution remediation, and relates to farmland heavy metal pollution soil remediation. The passivator is prepared from the following raw materials: natural zeolite, ferrous sulfate and brucite, the use amount of the ferrous sulfate is 10%-50% of the mass of the natural zeolite, the use amount of the brucite is 10%-40% of the mass of the natural zeolite, and the passivator can be obtained by uniformly mixing all the components. The passivator nt is simple in preparation method, natural in raw material source, free of secondary pollution to soil and convenient to construct, farmland fallow is not needed during application, the passivator is applied in leisureseasons, and normal agricultural planting is not affected; the passivator provided by the invention is low in price and obvious in remediation effect, can effectively reduce the content of heavy metals in crops and the content of available heavy metals in soil, and has a good application prospect in the aspect of remediation of large-scale heavy metal contaminated farmlands.