42 results about "Bentonite powder" patented technology

This invention discloses a high-density composite for long-lasting water bottom improvement and disinfection, and its preparation method, relating to the field of aquaculture technology. The high-density composite is prepared from the following raw materials: a premixed additive, potassium persulfate, sodium chloride, gelatinized starch, bentonite powder, attapulgite, cement, calcium carbonate, titanate coupling agent, purified water, and molasses. This invention also discloses a method for preparing the high-density composite. The high-density composite for long-lasting water bottom improvement and disinfection of this invention has advantages such as long duration of slow-release bottom improvement, good stability, simple preparation method, low production cost, and ease of large-scale production. It fills the gap in slow-release bottom improvement products and solves the problems of current slow-release bottom improvement technologies, such as difficulty in controlling the slow-release rate, complex preparation methods, high production costs, and difficulty in large-scale production.

The invention relates to the field of biodegradable high polymer materials, and discloses a bio-based packaging material with an anti-oxidation effect and a preparation method of the bio-based packaging material. 40 to 60 parts of polyhydroxyalkanoate; 10-20 parts of a composite antioxidant filler; the composite antioxidant filler is prepared by the following steps: (a) crushing sodium bentonite until the specific surface area is 45-55 m < 2 > / g and the particle size distribution D90 is less than or equal to 10 microns; (b) mixing bentonite powder and water according to the ratio of 1kg: 5L to form dispersion liquid with the solid content of 18%, and adding 0.3% sodium hexametaphosphate dispersing agent; (c) adding cerium nitrate; and (d) heating the product to 1050 DEG C at a speed of 8 DEG C / min, and calcining for 2 hours. Through the intercalation structure of the bentonite-based composite filler, an inorganic antioxidant component is organically combined with a bio-based polymer matrix, so that a breakthrough in long-acting oxidation resistance is realized in a completely biodegradable polylactic acid / polyhydroxyalkanoate system, and the technical bottleneck that traditional bioplastics are easy to oxidize and degrade is solved; and a sustainable solution is provided for green packaging materials.

The utility model relates to bentonite impurity removing equipment, which is used for solving the technical problems that most of filter screens are horizontally arranged, materials or impurities are easily accumulated above the filter screens to cause blockage, and during screening, most of the filter screens can be used for picking and taking out large-particle impurities in bentonite powder by workers, so that manpower and material resources are extremely easily wasted. A feeding port is formed in the top end of the first-stage screening box, a discharging port is formed in the side wall, close to the bottom, of the first-stage screening box, two L-shaped and opposite sliding rails are arranged in the wall of the first-stage screening box, a large-diameter screen is arranged on the two sliding rails in a sliding mode, notches are formed in the two ends of the large-diameter screen, and a pull ring is arranged on the top face of the large-diameter screen. A small-caliber screen is fixedly installed on the side wall of the first-stage screening box, a first motor is arranged at the bottom of the first-stage screening box, a first rotating shaft is installed on the first motor, a first shifting rod is installed on the first rotating shaft, a second shifting rod is installed on the first rotating shaft, and a second-stage screening box is connected to the side, close to the discharging port, of the second-stage screening box in a communicating mode.

The method of producing high-density bentonite pellets or bricks involves preparing an activated bentonite suspension in a dedicated tank by mixing dry bentonite powder with activated bentonite milk in the form of a 12% suspension in a continuous mixer and then pressing the resulting mixture under high pressure into the shape of pellets or bricks.

The invention discloses a preparation method of a negative carbon modified clay-based salt-tolerant anti-seepage material, which comprises the following steps: grinding natural bentonite, washing with water to remove coarse particles, adding into a NaCl solution for sodium treatment, washing, and drying to obtain sodium bentonite powder; dispersing the obtained sodium bentonite powder in deionized water, carrying out shearing dispersion to realize lamella stripping, and carrying out centrifugal treatment to remove undispersed large particles so as to obtain highly dispersed nanosheet liquid; dissolving organic amine in the nanosheet liquid, adjusting the pH value to 8.5-9.0, heating to 60-80 DEG C, carrying out intercalation reaction for 4-24 hours, washing, and drying to obtain organic amine modified bentonite; the organic amine modified bentonite is mixed with water to obtain wet soil, the wet soil is placed in a fixed bed adsorber, CO2 gas is introduced, and the organic amine modified bentonite fully adsorbs CO2; and carrying out compression molding on the modified bentonite after adsorbing CO2 according to a set compaction degree to obtain the negative carbon modified clay-based salt-tolerant anti-seepage material.

The invention relates to the field of organic soil, and particularly discloses drilling fluid organic soil and a preparation method thereof. The preparation method of the drilling fluid organic soil comprises the following steps: crushing calcium bentonite to prepare slurry, adjusting the pH value to 5-6, and acidizing to obtain activated bentonite slurry; adding urea accounting for 10-30% of the mass of the calcium bentonite into the activated bentonite slurry, and carrying out primary intercalation reaction to obtain primary intercalated bentonite slurry; and adding a secondary intercalator accounting for 5-20% of the mass of the calcium bentonite into the primary intercalation bentonite slurry, carrying out a secondary intercalation reaction, and carrying out filter pressing and drying to obtain the organic soil for the drilling fluid. The drilling fluid organic soil has the advantages of being wide in raw material source, low in cost and easy to produce and operate.

This invention relates to the field of bentonite adsorbent material preparation technology, and discloses a composite modified bentonite adsorbent material and its preparation process, including the following steps: S1: Coarsely crush the raw bentonite ore into granules, then finely grind it and pass it through a 200-mesh sieve, collecting the bentonite powder that passes through the sieve; S2: Add the bentonite powder and hydrochloric acid to a reaction vessel and stir to react; S3: After the acidified bentonite slurry is filtered by pressure, it is washed with deionized water until the pH of the filtrate is 6.5-7.0, and then the filter cake is dried to obtain a pre-dried acidified bentonite filter cake; S4: The pre-dried filter cake is passed through a rotary kiln, and microwave heating is set in the rotary kiln to finally obtain thermally activated bentonite; S5: The thermally activated bentonite is mixed with CTAB at 70°C. The preparation process of this composite modified bentonite adsorbent material significantly improves the comprehensive adsorption performance of bentonite through the synergistic effect of acidification, microwave activation and organic intercalation. Microwave activation quickly removes interlayer water and stabilizes the framework structure, avoiding the risk of thermal collapse.

This invention discloses a method for preparing a carbon-modified clay-based salt-resistant and seepage-proof material. Natural bentonite is ground, washed with water to remove coarse particles, and then subjected to sodium treatment in NaCl solution. After washing and drying, sodium-based bentonite powder is obtained. The obtained sodium-based bentonite powder is dispersed in deionized water, sheared to achieve layer exfoliation, and centrifuged to remove undispersed large particles, resulting in a highly dispersed nanosheet liquid. An organic amine is dissolved in the nanosheet liquid, the pH is adjusted to 8.5-9.0, and the mixture is heated to 60-80℃ for intercalation reaction for 4-24 hours. After washing and drying, organic amine-modified bentonite is obtained. The organic amine-modified bentonite is mixed with water to obtain wet soil, which is placed in a fixed-bed adsorber and CO2 gas is introduced to allow the organic amine-modified bentonite to fully adsorb CO2. The modified bentonite after CO2 adsorption is pressed into shape according to a set compaction degree to obtain the carbon-modified clay-based salt-resistant and seepage-proof material.

The application relates to the technical field of materials, and discloses a carbon-based adsorption material for treating heavy metal contaminated soil, which is prepared by using surface functionalized activated carbon as a base material, using bentonite and fly ash as auxiliary materials, bonding through biomass guar gum, and then mixing and sintering. The carbon-based adsorption material is prepared by using surface functionalized activated carbon as the main substance of the adsorption material, using bentonite and fly ash as auxiliary materials, realizing adsorption enrichment of heavy metal ions in the soil through the ultrahigh specific surface area of the activated carbon and the bentonite, then performing chemical solidification of the heavy metal ions by using active groups in the structure of the surface functionalized macromolecular reagent, and forming an adsorption mode of adsorption first and then solidification, so that the prepared adsorption material has extremely strong adsorption capacity and does not cause secondary pollution.

The invention relates to the technical field of bentonite adsorption material preparation, and discloses a composite modified bentonite adsorption material and a preparation process thereof, the preparation process comprises the following steps: S1, coarsely crushing bentonite raw ore into particles, then finely grinding, sieving with a 200-mesh sieve, and collecting undersize bentonite powder; s2, adding bentonite powder and hydrochloric acid into a reaction kettle, and carrying out a stirring reaction; s3, carrying out filter pressing on the acidified bentonite slurry, washing the acidified bentonite slurry with deionized water until the pH value of filtrate is 6.5-7.0, and then drying a filter cake to obtain a pre-dried acidified bentonite filter cake; s4, the pre-dried filter cake passes through a rotary kiln, microwave heating is arranged in the rotary kiln, and finally heat activated bentonite is obtained; and S5, mixing the thermally activated bentonite with CTAB at 70 DEG C. According to the preparation process of the composite modified bentonite adsorption material, through the synergistic effect of acidification, microwave activation and organic intercalation, the comprehensive adsorption performance of bentonite is remarkably improved, interlayer water is rapidly removed through microwave activation, a skeleton structure is stabilized, and the risk of thermal collapse is avoided.

The invention discloses a novel plaster and a preparation method thereof.The plaster is prepared from honey as a main raw material through the steps of fermentation, heating, esterification, acetylation and the like, the honey, diammonium phosphate, vitamin B and yeast are mixed and fermented, and alcohol, carbon dioxide and acetic acid are generated; heating to volatilize alcohol and carbon dioxide, and then adding ethylene glycol, glycerol and carboxymethyl cellulose for esterification and acetylation reaction; then adding anhydrous magnesium sulfate powder and bentonite powder, and uniformly stirring; heating, adding acetic acid, a triblock thermoplastic elastomer and beewax, and stirring to form a viscous solution; and finally, adding the herbaceous plant micro powder and borneol, mixing, and coating and forming. In the application process of the plaster, the bentonite absorbs water and expands, the anhydrous magnesium sulfate reacts with water to form a crystalline hydrate, the surface of the plaster is of a honeycomb loose porous structure, the contact area with the skin is increased, the transdermal absorption efficiency is improved, the comfort is improved, swelling is relieved, the manufacturing method is simple, and the cost is low.

The invention relates to the technical field of smashing and dust removing devices, and provides an organobentonite smashing and dust removing device which comprises a material collecting box, a dust blocking half cover, a movable positioning assembly, a dust blocking circular plate and a bag fixing ring, the material collecting box is located below a smashing machine, a circular feeding opening is formed in the top end of the material collecting box, and universal wheels are installed at the bottom end of the material collecting box; the two dust blocking half covers are slidably installed at the top end of the material collecting box through the synchronous moving assemblies, the moving positioning assemblies are arranged on the side faces of the material collecting box and the crusher, the dust blocking circular plate is arranged at the top end of the material collecting box through the rotating assembly, and the bag fixing ring is arranged on the rotating assembly. According to the organic bentonite smashing and dust removing device, by means of the material collecting box, the dust blocking half cover, the movable positioning assembly, a dust blocking circular plate and a bag fixing ring, the problem that in the prior art, when smashed organic bentonite fine powder is collected, some dust is generated when the fine powder falls down, and the dust is prone to falling off is solved. And therefore, the device is easily adsorbed into the body by a worker.

The invention discloses a reverse osmosis concentrated water treatment agent and a preparation method thereof, and belongs to the technical field of sewage treatment.The reverse osmosis concentrated water treatment agent is characterized in that bentonite powder is subjected to alkali washing and acid washing, carboxyl on the surface, boric acid groups of phenylboronic acid and hydroxyl of 2, 5-hydroxyterephthalic acid are subjected to an esterification reaction, then the reaction product and titanium tetrachloride are subjected to a hydrothermal reaction, and titanium-based MOF is generated in situ; after being treated by gamma-methacryloxypropyltrimethoxysilane, the activated bentonite is copolymerized with zinc acrylate and N-isopropylacrylamide to form a hydrogel membrane, boron and zinc are introduced, and the adsorption and ion exchange capacity of the treatment agent can be remarkably improved through the high specific surface area of the hydrogel membrane and activated bentonite and the porosity of a titanium base; the adsorption effect on manganese ions and calcium ions is improved; in the self-synthesis process of the titanium-based MOF, part of boron of phenylboronic acid enters crystal lattices of the titanium-based MOF to replace titanium ions, so that a band gap is narrowed, the visible light absorption range is widened, and the photocatalytic activity is improved.

This invention discloses a method for treating bisphenol A type epoxy resin wastewater using calcium-based bentonite. The method includes the following steps: centrifuging bentonite powder N times (N=2~3) according to a centrifugation treatment method, collecting the calcium-based bentonite suspension and calcium-based bentonite; mixing the calcium-based bentonite suspension with the bisphenol A type epoxy resin wastewater, adding calcium-based bentonite to obtain a mixed solution; stirring the mixed solution at 50~90 °C, allowing it to stand, and centrifuging to obtain organically modified sodium bentonite with industrial application value and purified wastewater with COD emission levels meeting standards. This method significantly reduces the COD content of bisphenol A type epoxy resin wastewater, meeting the direct COD emission standard in the Chinese national standard GB 31572-2015 "Emission Standard of Pollutants for Synthetic Resin Industry". It requires no chemical modification agents, causes no secondary pollution, has mild reaction conditions, a simple process flow, and low production costs.

This invention discloses a production process and system for preparing high-performance lightweight aggregate using fallen oil sludge and pyrolysis slag. The steps are as follows: Fallen oil sludge and / or pyrolysis slag, fly ash, and bentonite powders are metered according to a specified ratio and then sequentially fed into two twin-shaft mixers connected in series for mixing and staged water addition. The raw ceramsite exiting the twin-shaft mixers is extruded and granulated, then shaped to obtain ceramsite pellets. The ceramsite pellets are first indirectly dried in a rotary indirect dryer to a moisture content of 12-17%, then dried in a belt dryer to a moisture content ≤4%, and finally calcined at high temperature in a rotary kiln. After cooling in a grate cooler, they are screened and stored, yielding the oil sludge ceramsite product. This invention utilizes a combined process technology of a kiln tail heat recovery system, a kiln head heat recovery system, a calcination system, and a flue gas treatment system to solve the drying safety issues, flue gas treatment, and emission problems caused by volatile petroleum hydrocarbon components in the ceramsite pellets, thereby improving system thermal efficiency and reducing system energy consumption.

The invention relates to the technical field of adsorption materials, in particular to a method for preparing a high-water-absorption adsorption material and mineral composite modified sludge gasification slag. The method comprises the following steps: S1, crushing and grinding the sludge gasification slag to obtain gasification slag powder; the preparation method comprises the following steps: crushing and grinding bentonite raw ore to obtain bentonite powder; s2, physically mixing the bentonite powder obtained in the step S1 with gasified slag powder, and uniformly stirring in mixing equipment to obtain a mixed dry material; s3, sodium carbonate serving as a sodium modifying agent is added into the mixed dry material obtained in the step S2, a kneading reaction is performed through a kneading machine, and a proper amount of water is sprayed in the kneading process to promote the sodium modifying reaction; and S4, gradually heating and drying the sodium modified product obtained in the step S3 to constant weight, and crushing, grinding and sieving the obtained dried material to obtain the high-water-absorption composite adsorption material. The mineral composite modified sludge gasification slag adsorbing material prepared by the invention shows extremely high water absorption rate.

The invention relates to the field of non-metallic mineral materials, in particular to a purification method for improving the purity of bentonite. Raw ore is subjected to crushing pretreatment, so that the particle size of the raw ore can pass through a 200-mesh screen, and sufficient subsequent reaction is ensured. Then, the crushed bentonite powder and deionized water are fully mixed according to the solid-to-liquid ratio of 1: 8, and uniform and stable initial slurry is formed; and on the basis of the slurry, sequentially executing a core purification step, ultrasonic and chemical impurity removal, stepped sedimentation, low-temperature gradient centrifugation, targeted iron removal and dehydration drying to obtain a high-purity and high-whiteness bentonite concentrate product. Compared with a traditional process, the method designed by the invention has the advantages that the purification period is greatly shortened, the total amount of the required dispersing agent is remarkably reduced, nanoscale impurities are efficiently removed, particularly, iron impurities which are difficult to treat also have an excellent removal effect, equipment required by the whole process flow is high in universality, a special device is not needed, and the method is suitable for industrial production. And the comprehensive production cost is effectively reduced.

This application provides a composite bentonite and its preparation method. The preparation method includes: providing a mixed solution comprising bentonite powder, an organic cationic modifier, and water; reacting the mixed solution at a temperature of 60-80°C to obtain a suspension containing modified bentonite; drying the suspension containing modified bentonite to obtain modified bentonite, wherein the water content of the modified bentonite is less than 1.5%; pulverizing the modified bentonite to obtain organic cationic modified bentonite powder; mixing the organic cationic modified bentonite powder with an amino acid salt modifier and performing dry modification to obtain composite modified bentonite. The preparation method of this application produces a composite modified bentonite with good moisturizing properties and the ability to absorb oil, giving the composite modified bentonite the characteristics of oil control without drying.

The invention discloses a high-water-retention slow-release microalgae biological fertilizer and a preparation method thereof, and belongs to the technical field of compound microbial fertilizers. The problems that in the prior art, high polymer materials such as acrylic polymers are adopted as coating raw materials, the waterproof and water-retaining performance is poor, loss of water-soluble fertilizer cores can be accelerated, and then the slow-release effect of the coated fertilizer is damaged are solved; the invention relates to a high-water-retention slow-release microalgae biological fertilizer which comprises a film layer formed by alternately spraying and curing core compound fertilizer particles doped with microalgae powder, a high-molecular polymer emulsion and a water-retention emulsion from inside to outside. The high-molecular polymer emulsion is obtained by reacting siloxane-containing propylene ester and allyl alcohol; the water retention emulsion is obtained by uniformly mixing acidified bentonite powder and polymethylene polyphenylene isocyanate; the prepared fertilizer has the advantages that the fertilizer core is green and environment-friendly, the coating layer is good in waterproof and water-absorbing performance, and the slow-release effect is good.

The application discloses a kind of bentonite-based control materials of rapid prototyping and preparation method, including the following raw materials are made: bentonite, fly ash, blast furnace slag and excitation agent, wherein, the mass ratio of bentonite and fly ash is 1:0.2-0.4, based on the total mass of bentonite and fly ash, the addition amount of blast furnace slag is 10-20%, and the addition amount of excitation agent is 13.33-16.69%.After water glass and sodium hydroxide are dissolved in water, the excitation agent is prepared by adding modifier, the excitation agent is added to the dry powder sample mixed with fly ash and blast furnace slag, stirring, stuffing, adding bentonite and stirring into shape.The application uses water glass, phosphate and the like as excitation agent, uses industrial solid waste as supplementary admixture for required calcium, silicon, aluminum and other elements, the obtained control material has good compressive strength, good chemical compatibility, can realize rapid control function, and the penetration performance is two orders of magnitude lower than the national standard requirement after maintenance for 7d.

The utility model discloses double-helix activated clay mixing equipment which comprises a machine body, a feeding cavity and a mixing cavity are formed in the machine body, the feeding cavity is located right above one end of the mixing cavity and communicated with the mixing cavity, a powder inlet and a water inlet are formed in the feeding cavity, and a slurry outlet is formed in the other end of the mixing cavity; the stirring assembly is used for pushing the bentonite powder, and the stirring assembly is located in the feeding cavity; the material mixing assembly is used for mixing water and bentonite powder, and the material mixing assembly is located in the material mixing cavity; wherein the mixing assembly comprises two screw rod units used for conveying and stirring a mixture of water and bentonite powder, and a driving mechanism used for driving the two screw rod units to synchronously and reversely rotate relative to the machine body is arranged on the machine body. According to the utility model, the mixing uniformity between water and bentonite powder can be improved, the quality of slurry formed by mixing is guaranteed, and the subsequent production of activated clay is facilitated.

The invention discloses application of plastic resin polymer particles containing bentonite powder in preparation of light molded products, and belongs to the technical field of plastic products. The plastic resin polymer particles are prepared by mixing bentonite-containing powder and plastic resin, can be used for manufacturing light molded products and various environment-friendly molded products, and also have the antibacterial characteristic; the raw material has a specific gravity difference and is suitable for various products.

The application discloses a preparation method of modified dolomite powder and belongs to the technical field of dolomite modification treatment. The modified dolomite powder is prepared from the following raw materials in weight: 70-90 parts of dolomite powder, 1-5 parts of white hydrogen bentonite powder, 10-30 parts of nano-carbonate and a dispersing agent, wherein the weight of the dispersing agent is 0.1-0.3 percent of the weight of the nano-carbonate. The preparation method of the modified dolomite powder provided by the application can make the weak-acid dolomite powder dispersion liquid and the weak-alkali nano-carbonate dispersion liquid mix, and then make the dolomite powder particles and the nano-carbonate particles assemble and agglomerate through electrostatic mutual attraction, thereby improving the loading capacity and loading area of the nano-carbonate particles on the surface of the dolomite powder particles, and making the nano-carbonate particles uniformly and stably coated on the surface of the dolomite powder particles to form composite particles.

The antibacterial far infrared negative ion non-woven fabric is obtained by padding a primary non-woven fabric with a porous structure in modified slurry, spraying an antibacterial solution and drying, during padding treatment, the primary non-woven fabric is introduced into a dipping tank, is fully dipped in the modified slurry in the dipping tank and then is rolled to be dry, the liquid carrying rate of the primary non-woven fabric is controlled to be 12-18%, and then an antibacterial solution is sprayed; wherein the modified slurry is prepared from the following raw materials: a water-soluble polyurethane solution, modified bamboo charcoal powder, medical stone powder, illite powder, chitosan, organic bentonite powder, polyamide wax, polyethylene glycol ether and a penetrating agent. And an excellent antibacterial effect can be achieved.

The invention belongs to the field of fertilizers, and particularly relates to a humic acid activated synergistic fertilizer as well as a preparation method and application thereof. Urea is used as a core fertilizer, sodium carboxymethyl cellulose-bentonite micro powder is used as a coating carrier, activated humic acid, potassium humate and polyaspartic acid are combined to form a microporous coating layer, and the humic acid activated synergistic fertilizer is obtained. Humic acid is activated through xylanase and laccase, so that carboxyl and phenolic hydroxyl are exposed, the film-forming property is enhanced, and the humic acid is complexed with urea to reduce nutrient loss; sodium carboxymethyl cellulose and bentonite construct a cross-linked network through hydrogen bonds and Van der Waals force, the coating layer is endowed with good mechanical properties and environmental compatibility, and the coating layer realizes nutrient controlled release through micropore diffusion and a humidity response swelling mechanism. Potassium humate stabilizes rhizosphere pH through functional group proton buffering, polyaspartic acid regulates and controls soil water-retaining property and swelling behavior through carboxyl hydration, dynamic matching of moisture and nutrient release is achieved, and utilization of fertilizer nutrients is improved.

The application discloses a kind of automatic grinding device for bentonite crushing processing, it is related to bentonite processing technical field.The present application includes bottom plate, the top of the bottom plate is fixed with machine shell by support, the top of the bottom plate is fixed with grinding tank, the inner wall top of the grinding tank is rotatably installed with driving shaft, the inside of the machine shell is provided with crushing roller group, the bottom of the machine shell is provided with spiral feeding assembly, the discharge end of the spiral feeding assembly is fixed at the outer wall of grinding tank, the driving shaft is driven by motor, the lower outer wall of the driving shaft is fixed with grinding roller, the machine shell and grinding tank are provided with screening device.The setting of the screening device makes several cylinders and several J-shaped plates screen bentonite raw materials, through screening, it ensures that the bentonite entering the grinding tank is relatively uniform in size, and avoids large-particle bentonite raw materials from entering the grinding link, which can improve the efficiency of grinding operation.

The invention discloses chitosan / activated carbon / bentonite composite aerogel as well as a preparation method and application thereof, and belongs to the technical field of oil absorption materials. The chitosan / activated carbon / bentonite composite aerogel is prepared by taking chitosan, activated carbon and bentonite as raw materials and adopting a sol-gel method and a freeze-drying method. The preparation method of the aerogel comprises the following steps: adding bentonite powder into a chitosan solution, continuously stirring, adding activated carbon powder, and continuously stirring to obtain a mixed solution; adding an epichlorohydrin solution into the mixed solution, continuously stirring again to fully mix the epichlorohydrin solution and the mixed solution, freezing, and finally freeze-drying to obtain the aerogel. The aerogel disclosed by the invention has high specific surface area, high porosity and excellent hydrophobic and oleophylic characteristics, shows good adsorption performance on various oil products and organic solvents, has the highest adsorption capacity of 42.5 g / g, and also has relatively high stability and good cyclic utilization performance.

The invention relates to the technical field of heavy metal contaminated soil remediation, in particular to a method for remedying livestock and poultry manure heavy metal contaminated soil, according to the method, soil to be remediated is deeply ploughed before a composite passivator is applied, the depth is set, the composite passivator is applied, watering is performed after uniform mixing, and soybeans are sown after standing; the sowing depth of the soybeans is 1.5 cm, and the soil humidity is kept to be 60% of the field moisture capacity in the cultivation period. The composite passivator is composed of calcium magnesium phosphate fertilizer, biochar and bentonite, the preferable ratio is 1: 1: 1.2, and the bentonite is crushed and sieved by a 100-mesh sieve. Heavy metals such as copper and zinc in soil can be effectively passivated, the soil fertility is improved, soybean growth is promoted, secondary pollution is avoided, operation is easy and convenient, cost is low, and the method is suitable for large-area farmland remediation.

A soil amendment for regulating salinity and solidifying heavy metals includes 50-70 parts by weight of natural calcium-based bentonite, 20-25 parts by weight of fly ash, 10-20 parts by weight of water, 20-25 parts by weight of weathered coal, and 2-6 parts by weight of composite microbial agent. The soil amendment not only efficiently removes pollutants from poor-quality soil, but also increases the yield and quality of plants. It can also provide a new idea for expanding the application research of the natural calcium-based bentonite, the fly ash, the weathered coal, and salt and drought-resistant plants to more fields. This degradation of the soil amendment has high efficiency, low cost, easy operation, and does not cause secondary pollution, and has broad application prospects.