34 results about "Aluminium silicate" patented technology

The utility model discloses a heat preservation layer assembly structure of a high-temperature heater. The heat preservation layer assembly structure comprises an inner-layer amorphous aluminum silicate needled carpet and an outer-layer amorphous aluminum silicate needled carpet. According to the utility model, the periphery of each heating wire unit is coated with a plurality of layers of complete aluminum silicate needled blankets, the inner-layer amorphous aluminum silicate needled blankets and the outer-layer amorphous aluminum silicate needled blankets are respectively arranged from inside to outside, meanwhile, the annular abutted seam A and the annular abutted seam B between two adjacent layers are in a staggered position state, and the annular abutted seams are few; the structural integrity of an aluminum silicate needled carpet air hole bin and ceramic fibers is reserved, so that it is guaranteed that the heat preservation and heat insulation performance of the aluminum silicate needled carpet is fully exerted, the heaters are spliced through the flexible aluminum silicate needled carpet step concave-convex structures, heat convection dissipation of the heaters is reduced, and heating electric energy is saved.

The utility model discloses equipment for continuously heating and evaporating silicon slurry. The equipment comprises a shell, a cone, an end socket and a slurry stirrer, the whole material is Q345 and Q235; the shell is fixedly connected with the cone, the coil is wound on the outer sides of the shell and the cone, current passing through the coil is adjusted through the control cabinet, electric energy is converted into heat energy according to the electromagnetic induction principle, and materials in the equipment are evenly heated. A heat preservation layer is arranged on the outer side of the coil and is made of aluminum silicate, aerogel, ceramic fibers and the like. The equipment system is high in heating efficiency, traditional heat conduction oil jackets or half-pipe heating is replaced by electromagnetic heating, and the heating speed and the energy utilization rate are increased.

The utility model discloses a steam trap heat preservation device, including connecting block, the connecting block inside rotation is connected with the pivot, the pivot end fixed mounting has the side plate, and set up the processing subassembly at the connecting block outside, the processing subassembly includes setting up the clamping component at the connecting block outside, when to steam trap heat preservation processing, will the outer shell cover set in its outer wall, because the high temperature resistance polyurethane foam caulk agent has certain viscosity, can make the outer shell and aluminium silicate needle -punched blanket firmly stick together, under the cooperation of outer shell, high temperature resistance polyurethane and aluminium silicate needle -punched blanket, steam trap cover heat preservation, through the outer shell steam trap heat preservation, and it will two outer shell connection, makes two clamping plate end inclined plane contact extrusion, and clamping plate takes with the support rod rotation connection place as the rotation center rotation, when two clamping plate mutual clamping, at this moment, under the repulsion of second magnetic sheet and first magnetic sheet magnetism, push clamping plate, make two clamping plate firm clamping.

The invention discloses a method for repairing a leakage point pipeline of a positive-pressure concentrated-phase conveying system, and relates to the technical field of pipeline repairing, and the method comprises the following steps: step 1, providing aluminum silicate thermal insulation cotton and sodium silicate water glass for later use; 2, according to the size of a leakage point of the pipeline and the diameter of the pipeline, tearing the aluminum silicate heat preservation cotton into a plurality of parts, and soaking the parts in sodium silicate water glass; 3, the soaked aluminum silicate heat preservation cotton is pasted to the leakage point of the outer wall of the pipeline and the periphery of the leakage point, and plugging of the leakage point is formed; the leakage point pipeline can be rapidly repaired, and meanwhile the copper concentrate ignition can be avoided.

The present application relates to the field of environmental management technology, and more particularly to a composite coagulant for landfill leachate treatment and a preparation method thereof.The composite coagulant comprises inorganic coagulant, organic flocculant and nano coagulant aid; the inorganic coagulant is a mixture of polymeric aluminum ferric silicate and basic aluminum chloride; the organic flocculant is polydimethyl diallyl ammonium chloride; and the nano coagulant aid is a mixture of nano calcium oxide, nano ferric oxide and activated carbon.The composite coagulant has the characteristics of high efficiency in removing solid suspended matter and soluble organic matter in water, fast precipitation speed, one-step flocculation and sedimentation, formation of stable flocculation large particles in sewage, and effective reduction of the load of subsequent leachate treatment equipment.

The application relates to the technical field of papermaking, and particularly provides high-pressure-resistance low-explosion-rate electrolytic capacitor paper and a production process thereof; the electrolytic capacitor paper comprises the following components: polyethylene terephthalate microfiber 30-50%, modified cellulose short fiber 20-40%, aluminum silicate nanoparticles 5-15%, silane coupling agent 0.5-1.5%, and wet-strength resin 10-25%. The polyethylene terephthalate microfiber is used to construct a high-strength skeleton, the modified cellulose short fiber is used to strengthen the fiber-inorganic interface, the aluminum silicate nanoparticles are used to precisely fill pores, the silane coupling agent is used to enhance the multiphase combination, the wet-strength resin is used to maintain fiber adhesion in a wet state, and the layered gradient pore design is used, so that excellent compression strength and uniform electrolyte immersion are realized, local over-immersion and bubble aggregation are effectively inhibited, the risk of breakdown and explosion is significantly reduced, and the safety and reliability of the capacitor paper under high-pressure long-life working conditions are improved.

The utility model relates to the technical field of SCR catalyst production equipment discloses a net belt kiln cooling structure for SCR catalyst, including the conveyer belt, the conveyer belt side fixedly connected with the net belt kiln, the inner wall of net belt kiln is provided with cooling assembly, the cooling assembly includes a plurality of cooling pipes, a plurality of cooling pipes are located in the inner wall of net belt kiln, the inner wall top of net belt kiln is provided with hard aluminium silicate fibre board, a plurality of cooling pipes both ends are through hard aluminium silicate fibre board and extend to the top of net belt kiln, the top of net belt kiln is provided with connecting pipe no. One, air inlet pipe and air outlet pipe, the both sides of connecting pipe no. One top are fixedly connected with the communication piece no. One and the communication piece no. Two respectively. In the utility model, through setting cooling assembly in the top of net belt kiln, and installing hard aluminium silicate fibre board in the top of kiln inner wall, the effect that the catalyst is indirectly cooled steadily and uniformly is reached, and the reliability and stability of kiln cooling process are enhanced.

This invention discloses a biomass nanocomposite for relieving rhinitis and its preparation method, belonging to the field of new materials. It includes a dressing containing a biomass nanomedicine layer. The dressing comprises a fixed adhesive layer and a movable adhesive layer bonded together, with the biomass nanomedicine layer adsorbed on the movable adhesive layer. The fixed adhesive layer includes a flexible substrate, with a base adhesive layer bonded to one side and a top adhesive layer bonded to the other side. The base adhesive layer comprises methyl methacrylate-grafted modified SIS hot-melt pressure-sensitive adhesive, hyaluronic acid silicone gel, and nano-aluminum magnesium silicate. The top adhesive layer comprises benzophenone photoinitiator, acrylic acid-grafted modified SIS hot-melt pressure-sensitive adhesive, nano-titanium dioxide, quaternary ammonium salt-modified chitosan, and N,N'-methylenebisacrylamide. The movable adhesive layer comprises a hydrogel drug carrier, with the biomass nanomedicine layer adsorbed on the hydrogel drug carrier. This invention effectively avoids skin damage caused by repeated pulling of the adhesive layer.

This invention belongs to the field of ceramic refractory materials technology, specifically relating to a method for preparing an aluminosilicate fiber crucible with an anti-erosion coating, the crucible itself, and its applications. The method involves using aluminosilicate ceramic fibers, a solvent, organic monomers, and a crosslinking agent, followed by gel casting in a mold to form a three-dimensional skeleton structure of the aluminosilicate ceramic fibers. After drying and sintering, an aluminosilicate ceramic fiber crucible matrix is ​​obtained. A coating slurry is prepared using multi-stage Y₂O₃ powder and two grinding balls of different diameters. This slurry is then coated onto the inside of the aluminosilicate ceramic fiber crucible matrix. Finally, a multi-stage heating process is used for sintering to obtain an aluminosilicate fiber crucible with an anti-erosion coating. This invention improves the crucible's strength through gel casting and enhances its resistance to melt erosion by coating the inner wall of the crucible with a yttrium oxide coating, thus preventing interfacial reactions between the crucible and the melt.

The invention discloses a Si / SiOx / C composite material and a preparation method and application thereof, and relates to the technical field of battery materials. The Si / SiOx / C composite material comprises an inner core and a coating layer located on at least part of the surface of the inner core, the inner core comprises a carbon matrix and silicon particles, SiOx and metal silicate loaded in the carbon matrix, and the coating layer comprises a carbon material; the metal silicate comprises at least one of alkali metal silicate, alkaline earth metal silicate, aluminum silicate, titanium silicate and zinc silicate. When the Si / SiOx / C composite material is applied to a negative electrode material, a secondary battery prepared from the negative electrode material has good cycling stability and first coulombic efficiency.

The utility model discloses a launder system for molten aluminum conveying, and relates to the technical field of molten aluminum conveying, a plurality of launder prefabricated parts are installed along the conveying direction, and each launder prefabricated part is provided with a boss and a groove, so that the launder prefabricated parts can be quickly installed and positioned in sections, when a single section is damaged, a concave-convex structure is conveniently and quickly replaced, and the working efficiency is improved. Meanwhile, the splicing seam can be pressed through the self weight, the problem that molten aluminum is prone to permeating when flowing through the splicing seam is solved, and therefore a complete conveying line is formed, and the situation that the launder prefabricated part shifts due to the acting force of molten aluminum flowing in the running process is prevented through impermeable layers installed on the two sides of the launder prefabricated part; heat loss of molten aluminum in the long-distance conveying process is reduced, meanwhile, thermal deformation of a shell of a steel structure is avoided, impurities in the molten aluminum are filtered through the installed filter plate, the inner wall of a flowing groove of the flowing groove prefabricated part is automatically cleaned through the cleaning mechanism, and therefore the quality of the subsequently conveyed molten aluminum is guaranteed.

The utility model discloses a double-faced oval steel fire-resistant air pipe with aluminum silicate clamped in the middle. The double-faced oval steel fire-resistant air pipe comprises a main body, a plurality of screw holes are formed in the main body, a groove is connected to the inner side of the main body, a steel shell is connected to the left side of the main body, a U-shaped pipe body bracket is installed below the steel shell, and a fixing plate is connected to the upper side of the U-shaped pipe body bracket. Fixing screw holes are formed in the fixing plates, aluminum silicate is clamped on the inner side of the steel outer shell, a steel inner shell is clamped on the inner side of the aluminum silicate, and a connecting flange is installed on the left side of the steel inner shell. According to the double-faced oval steel fire-resistant air pipe, high-quality steel is used as a main body structure, and the innovative design of the double-faced oval steel fire-resistant air pipe is that a high-performance aluminum silicate heat insulation material is embedded between the inner shell and the outer shell, so that the fire-resistant characteristic of the air pipe is remarkably enhanced through the optimization. The non-traditional oval section design is adopted, the adaptability and flexibility of the structure are improved, efficient space utilization can be better achieved in diversified application scenes, and the advantages are particularly remarkable in the space-limited environment.

The utility model provides a kind of support device for cooling gate, including chassis, flexible connecting piece, two first ends are connected by the flexible connecting piece and second end can mutually converge heat preservation swing arm, first telescopic component for pulling one heat preservation swing arm is rotatably installed on the chassis, second telescopic component for pulling another heat preservation swing arm is rotatably installed on the chassis, with the support seat of the limiting card slot for accommodating the flexible connecting piece and part heat preservation swing arm with opening upwards, wherein the heat preservation swing arm, the first telescopic component and the second telescopic component are located above the limiting seat, and the flexible connecting piece is located directly above the limiting card slot. The utility model can improve the efficiency of covering aluminium silicate fiber blanket.

This invention belongs to the field of wall material technology, specifically, it relates to a high-strength flame-retardant wall material and its preparation process. The raw materials of the high-strength flame-retardant wall material, by weight, include the following components: 60-70 parts fly ash, 16-20 parts cement, 20-25 parts carbide slag, 9-12 parts modified bentonite, 5-7 parts lime, 4-6 parts calcium phosphate, 4-6 parts aluminum silicate, 2-3 parts aluminum sulfate, and 35-40 parts water. This invention modifies bentonite to form an N-vinylpyrrolidone / vinyl acetate crosslinked copolymer with a network structure on the surface of the bentonite. This not only improves the dispersibility of the bentonite, but the network structure also effectively inhibits the volume expansion of the bentonite after water absorption, reducing the risk of cracking caused by stress concentration. Subsequently, the pyrrolidone structure on the surface of the modified bentonite complexes with aluminum ions, making the internal structure of the resulting wall material more stable and further improving its compressive strength.

The invention discloses an aluminum profile calendering post-treatment process with a dynamic cooling rate regulation and control function. The aluminum profile calendering post-treatment process is suitable for 6005A-T6 double-cavity rectangular aluminum profiles. In order to solve the problems of large water cooling strength fluctuation, high warping and high online / liquid nitrogen scheme cost in the prior art, an L-shaped clamp with an aluminum silicate heat insulation layer is mounted offline at 510-520 DEG C after extrusion, so that the single face of a panel is in contact with a cooling medium, and then fixed-beat pulse quenching is performed through 2-s water soaking rapid cooling, 5-s lifting-off temperature returning and 3-s water soaking slow cooling. The process is small in yield strength fluctuation, small in warping, high in first-pass yield, low in transformation cost, fast in model changing, free of off-line straightening, adaptive to an existing cooling bed and excellent in economical efficiency and stability.

The invention discloses a self-buffering type composite defluorination preparation prepared by resource utilization of chemical sludge, and belongs to the field of sewage treatment preparations. The novel self-buffering type composite defluorination preparation provided by the invention has the capabilities of deeply removing fluorine ions and adjusting pH by utilizing the adsorption, net capturing and other effects of Si-Al-OH colloid generated after phosphorus polysilicate aluminum iron is hydrolyzed, phosphate radical vacancy and Ca < 2 + > and buffering property of calcium carbonate in chalk; the self-buffering type composite defluorination preparation is put into photovoltaic wastewater with the inlet water fluorine concentration of 14.2 mg / L and the pH value of 7.8, and after static settlement is conducted for 30 min, the outlet water fluorine concentration is lower than 1.5 mg / L, and the pH value is still kept to be 6.5 or above.

This invention belongs to the field of welding auxiliary materials technology, specifically relating to a ring-shaped gasket material for pipe welding. From the radial inner side to the radial outer side, it comprises a fusible support layer, a high-temperature resistant skeleton layer, a flexible bonding layer, and an active metallurgical layer. The fusible support layer is composed of a eutectic salt of sodium chloride, potassium chloride, and sodium silicate, which softens or partially melts at 650℃-750℃; the high-temperature resistant skeleton layer is a continuous alumina fiber woven and sintered mesh structure; the flexible bonding layer is a composite pressed layer of graphite worms and aluminosilicate fiber felt; and the active metallurgical layer is a coating layer containing titanium dioxide, cryolite, ferrosilicon powder, ferromanganese powder, and aluminum powder. This gasket addresses three practical engineering problems in pipe circumferential welding: assembly rigidity, high-temperature load-bearing capacity, and curved surface fit. Through the progressive and overlapping effect of the four-layer structure, it allows for a certain degree of asynchronous response among the layers, accommodating a certain range of assembly tolerances and welding parameter fluctuations. After welding, there are virtually no obstructions remaining inside the pipe, and the weld root is well-formed.

The utility model relates to the technical field of boilers, in particular to an efficient water pipe waste heat boiler which comprises a boiler body, an upper boiler barrel is installed on the top of the boiler body, a smoke inlet is formed in one end of the boiler body, a smoke exhaust pipe is connected to the other end of the boiler body, an energy saver is connected to the outer end of the smoke exhaust pipe, and a plurality of headers are installed on the upper side and the lower side in the boiler body. According to the efficient water pipe waste heat boiler, the multiple sets of collecting boxes and convection pipes are arranged in the boiler body and matched with the ascending pipes and the descending pipes, an efficient water circulation loop is formed, and the heat exchange efficiency is effectively improved. And meanwhile, the energy saver connected with the outer end of the smoke exhaust pipe further recovers waste heat in the exhausted smoke, the temperature of the exhausted smoke is reduced, and the overall energy efficiency of the boiler is remarkably improved. The refractory bricks, the aluminum silicate heat preservation layer and the refractory concrete layer are arranged on the inner wall of the boiler body, so that the high-temperature resistance and the heat preservation effect of the boiler are improved, and the service life of the boiler is prolonged. The arrangement of the ash removal door facilitates the cleaning and maintenance of the boiler, and ensures the long-term stable operation of the boiler.

This application relates to the field of flame-retardant cable technology, and discloses a B1-grade halogen-free, low-smoke flame-retardant special cable and its preparation method. The cable includes a cable core consisting of at least one insulated conductor. The cable core is covered from the inside out with a wrapping filling layer, a heat insulation layer, an oxygen barrier layer, a flame-retardant layer, and an outer sheath layer. The wrapping filling layer is made of aluminum silicate fiber rope, the heat insulation layer is made of ceramicized silicone composite tape, the oxygen barrier layer is made of halogen-free, low-smoke, flame-retardant polyolefin material, the flame-retardant layer is made of fire-resistant mica tape, and the outer sheath layer is made of an irradiated cross-linked halogen-free, low-smoke, flame-retardant polyolefin material containing ethylene vinyl acetate copolymer, metallocene-catalyzed linear low-density polyethylene, aluminum diethylphosphinate, melamine cyanurate, and an irradiation cross-linking agent. During preparation, the insulated conductor, wrapping filling layer, heat insulation layer, oxygen barrier layer, flame-retardant layer, and outer sheath layer are formed sequentially, and the outer sheath layer is irradiated and cross-linked. This technical solution combines flame retardancy, low smoke, low corrosion, and structural stability.

The invention belongs to the technical field of sludge dewatering, and particularly relates to a sludge dewatering method. According to the invention, cationic polyacrylamide and polyaluminum chloride or polyaluminum ferric silicate are taken as conditioners, so that charges carried by sludge particles can be neutralized, repulsive force among the sludge particles can be reduced, adsorption among the sludge particles can be increased, and the dehydration performance of the sludge can be improved; meanwhile, the conditioner plays a bridging role among sludge particles to form a net-shaped structure, so that the coagulation process is promoted, and the dehydration performance of the sludge is further improved. By reducing the sludge yield, sludge reduction and sludge treatment cost reduction are realized.

The utility model relates to the field of heat preservation cotton stamping processing, in particular to a stamping device for aluminum silicate heat preservation cotton processing, which comprises a stamping table, mounting side plates are bolted to the front and the back of the top of the stamping table, a conveying belt is arranged on the inner sides of the mounting side plates, and first mounting seats are bolted to the two sides of the top of each mounting side plate. And a driving shaft is rotationally connected to the inner side of the first mounting seat through a bearing, a pressing roller is bolted to the surface of the driving shaft, supporting frames are bolted to the periphery of the top of the punching table, and driving motors are bolted to the two sides of the top of each supporting frame. The stamping table, the mounting side plates, the driving shaft, the pressing rollers, the supporting frame and other assemblies are matched with the pressing plate to stamp the heat preservation cotton, stamping operation on the heat preservation cotton is completed, the stamping effect of the heat preservation cotton in the device is improved in a multi-time flat pressing mode, and the practicability of the device is improved.

A self-reinforced environmental barrier coating (EBC), methods of manufacturing the EBC, and articles comprising the EBC, are provided. The EBC is prepared from a composition of a rare earth silicate and an aluminum silicate at or near the eutectic point of the combination. The EBC forms a self-reinforcing fibrous phase that reduces or eliminates microcracks.

The invention relates to a method for synthesizing jadeite under normal pressure, which comprises the following steps: respectively weighing aluminum silicate, sodium carbonate and silicic acid in proportion, mixing to obtain a primary mixture, briquetting, sintering for five times under normal pressure, cooling to room temperature after the first four times of sintering, crushing, grinding, briquetting, and sintering for the next time to obtain the jadeite. Bismuth oxide is added during the third sintering, a coloring agent is added during the fourth sintering, jadeite is prepared during the fifth sintering, and a clarifying agent is added during the fifth sintering. The preparation is carried out under the normal pressure condition, the preparation condition requirement and the preparation cost are reduced, and batch production, popularization and application of the synthetic jadeite are facilitated.

The application discloses a kind of refractory materials for producing lithium battery negative electrode material ring calcination furnace, refractory material includes 90~150 parts by weight aluminium oxide, 30~50 parts by weight calcium oxide, 25~35 parts by weight silicon dioxide, 20~30 parts by weight electric melting white corundum powder, 5~10 parts by weight calcium hexaluminate, 4~6 parts by weight iron oxide, 3~6 parts by weight titanium oxide, 2~5 parts by weight aluminium silicate, 10~15 parts by weight binder;Aluminium oxide is powdered raw material, which contains 30%~50% of 20μm~40μm particle size aluminium oxide powder, 40%~60% of 40μm~60μm particle size aluminium oxide powder, and the rest is 60μm~100μm particle size aluminium oxide powder;The refractory material has better high-temperature resistance, can withstand high-temperature environment while ensuring its performance does not change;Refractory material has better corrosion resistance, can withstand erosion of materials in the furnace, while resisting chemical reactions, oxidation and reduction, etc.

The invention belongs to the technical field of refractory castable, and particularly relates to a high-strength refractory material as well as a preparation method and a local rapid maintenance and use method thereof. The high-strength refractory material is prepared from hydrated alumina, nanometer silica sol dry powder and potassium aluminum fluosilicate, the potassium aluminum fluosilicate is hydrolyzed after water is added to generate HF and active SiO2, the HF catalyzes dehydration of the hydrated alumina, the active SiO2 initiates polycondensation of nanometer silicon and the dehydrated hydrated alumina, an Al-O-Si three-dimensional gel network is formed, meanwhile, an AlF3 curing phase is generated in situ, and the high-strength refractory material is prepared. Wherein within 2 h after water adding construction, a gel shell composed of the Al-O-Si three-dimensional gel network is formed on the surface of the refractory material maintenance area, the water locking and anti-cracking functions are achieved, and the AlF3 curing phase is a high-melting-point, non-volatile and chemically inert solid phase formed after HF is safely captured by hydrated alumina.

This invention discloses a heated cigarette device component with a heat-insulating coating, its preparation method, and a cigarette device containing the component. The component includes a metal substrate and a silicate heat-insulating coating coated thereon. This coating is formed by coating, curing, and sintering a heat-insulating slurry containing water glass, specific fillers, and additives. The filler is composed of aluminosilicate fibers, mica powder, hollow glass microspheres, rutile titanium dioxide, low-melting-point glass powder, talc powder, and zirconium dioxide in a specific mass percentage. The final coating prepared by this specific formulation system, with an ultra-thin thickness of 50-100 μm, simultaneously possesses high heat insulation efficiency, excellent adhesion strength, and thermal shock resistance durability. Therefore, without encroaching on the internal space of the cigarette device, it effectively blocks heat transfer, significantly reduces the surface temperature of the outer shell and the internal environment, and improves the product's safety, reliability, and user experience.

The invention relates to a pesticidal composition comprising: a) as vegetable oil active ingredient at least three compounds selected from the group consisting of soybean oil, eugenol, cinnamaldehyde, tea tree oil, rapeseed oil, clove oil, spearmint oil; b) optionally, as inorganic active ingredient, Cu(I) oxide; c) as excipient, a compound selected from the group consisting of xanthan gum, polyvinyl alcohol, magnesium aluminium silicate, ethoxylated vegetable oil, preferably ethoxylated castor oil; benzenesulphonic acid C10-13 alkyl derivative, ethoxylated sorbitan ester, C12-14 ethoxylated alcohol, potassium polyarylphenyl ether phosphate, the sodium salt of methylene polynaphthyl sulphonate; (d) optionally glycerol as antifreeze; (e) optionally an antioxidant, preferably ascorbic acid; and (f) optionally water as a carrier, as required. The invention also relates to a process for the preparation of the composition according to the invention and its use as a pesticide.

The invention discloses a landfill tanning sludge in-situ reduction and stabilization reagent and application, the reagent comprises a composite ferric salt and carbide slag, the composite ferric salt comprises ferrous sulfate, polyferric sulfate and polysilicate aluminum ferric according to a mass ratio of (2-4): (6-8): (3-5), and the application amounts of the composite ferric salt and the carbide slag are 10%-20% and 2%-10% of the dry basis mass of sludge respectively. When in use, the composite iron salt is uniformly mixed into the sludge and is stirred in situ for 10-20 minutes, and the stirring depth is not less than the designed depth; spreading carbide slag, uniformly stirring for the second time, and curing in situ for 18-24 hours; constructing a drainage network; performing vacuum preloading on the covering film to realize solid-liquid separation; the system is dismantled after settlement is monitored to be stable. The water content of the treated sludge can be reduced to 56.2%, and the landfill requirement is met; the volume reduction rate reaches 48.7%, the unconfined compressive strength far exceeds a standard value, the chromium leaching concentration reduction amplitude reaches 97.5%, the chromium and zinc leaching concentrations both meet the repair requirements, and the in-situ deep dehydration of the landfill tannery sludge and the efficient stabilization of heavy metals are synchronously realized.

The invention discloses an application of polyaluminum ferric silicate for reducing the content of exchangeable sodium in soda saline-alkali soil, relates to the technical field of soil improvement, and particularly relates to an application of treating soda saline-alkali soil by using polyaluminum ferric silicate. The invention aims to solve the problems of poor stability and poor environmental protection of the traditional soil modifier. The polysilicate aluminum ferric is applied to the soda saline-alkali soil through turning and stirring, and the application amount is 0.3%-5% of the total amount of soil with the depth of 20 cm. The method is low in cost and convenient to treat, can be applied to large-area saline-alkali soil, effectively reduces the exchangeable sodium content of the soda saline-alkali soil, and eliminates alkaline obstacles of the soda saline-alkali soil.