140results about How to "Reduce alkalinity" patented technology

The invention discloses a sulfur-manganese composite autotrophic denitrification filler as well as a preparation method and application thereof, and belongs to the technical field of environmental functional materials and polluted water treatment. The sulfur-manganese composite autotrophic denitrification filler contains manganese salt, a sulfur-based component and a cement-based component, the manganese salt comprises one or more of manganese carbonate, calcium manganese ore and rhodochrosite; the sulfur-based component comprises sulfur and sulfur manganese ore; the cement-based component comprises cement, fly ash pottery sand, silica fume, blast furnace slag and metakaolin; the cement comprises one or more of Portland cement, iron aluminate cement and sulphoaluminate cement. The nitrogen removal efficiency of the sulfur-manganese composite autotrophic denitrification filler is superior to that of a sulfur autotrophic denitrification system, the sulfate concentration and nitrite nitrogen accumulation in effluent are remarkably reduced, the service life of the filler is prolonged, and the efficient utilization rate of the material is improved.

The invention discloses a method for activating and precipitating MHP through magnesium, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: S1, mixing a magnesium-containing solution with a sodium hydroxide solution, and carrying out precipitation reaction for 3-5 minutes to obtain a precipitator; s2, immediately mixing a precipitator with the laterite-nickel ore iron and aluminum removed liquid, and then carrying out first-stage nickel and cobalt precipitation reaction to obtain first-stage nickel and cobalt precipitation slurry; s3, performing first thickening treatment on the first-section nickel and cobalt deposited slurry to obtain first dense underflow and first dense overflow; and S4, filtering the first dense underflow to obtain an MHP product. According to the method, after the magnesium-containing solution and the sodium hydroxide solution are mixed, the magnesium solution and the sodium hydroxide solution are controlled to be mixed and react for 3-5 min, then the nickel and cobalt precipitation reaction is immediately carried out, the MHP product with high purity and quality can be obtained, and the whole method is simple and convenient for large-scale industrial application.

The invention discloses low-alkali solid waste cementing material-based plant-growing concrete and a preparation method thereof. The vegetation concrete comprises a base layer framework and a surface layer material laid on the framework. Wherein the base layer framework is prepared from the following raw material components in parts by weight: 160 to 200 parts of low-alkali solid waste cement, 15 to 25 parts of phosphogypsum, 1380 to 2100 parts of mineralized concrete recycled aggregate, 62 to 102 parts of mineral admixture and 60 to 90 parts of mixing water. The surface layer material comprises the following raw material components: 1-5% of sodium alginate, 1-10% of calcium superphosphate, 1-10% of urea and the balance of soil. The mineralized concrete recycled aggregate is prepared by the following steps: soaking the concrete recycled aggregate in a diammonium hydrogen phosphate solution, and separating out the aggregate after soaking is completed, thereby obtaining the mineralized concrete recycled aggregate. According to the plant-growing concrete, alkalinity in concrete pores can be remarkably reduced, and the plant-growing concrete has stable later strength and good plant germination rate.

The invention relates to the technical field of saline-alkali soil improvement, and discloses a composite improved saline-alkali soil composition based on biomass charcoal and a preparation method thereof.Biomass charcoal, glucose, lactic acid bacteria, saccharomycetes, aluminum sulfate and a quaternary ammonium salt modifier are added into a stirrer to be stirred and mixed, stirring is conducted, and a mixture is obtained; and obtaining the composite improved saline-alkali soil composition based on the biomass charcoal. A quaternary ammonium salt group in the quaternary ammonium salt modifier can reduce the pH value of the soil and reduce the alkalinity of the soil, so that the salinization condition of the soil is improved, and quaternary ammonium salt can promote the activity of soil microorganisms and improve the fertility of the soil and the growth environment of crops; the siloxane is converted to be neutral by adjusting the pH value of the soil, the siloxane is beneficial to reducing the alkalinity of the soil, and a more suitable growth environment is provided for plants; wherein the contained boric acid group reduces the pH value of the soil by neutralizing alkaline substances in the soil, and has a relatively good improvement effect on the saline-alkali soil.

The invention relates to the technical field of saline-alkali soil improvement, and particularly discloses a preparation process and application of a multifunctional slow-release saline-alkali soil conditioner. The preparation process comprises the following steps: (1) uniformly mixing alginic acid powder, ardealite powder, carbon powder and water to form a wet material, then putting the wet material into a closed container, and carrying out heating and heat preservation treatment to obtain a precursor; and (2) standing the precursor at normal temperature, and then crushing the precursor to obtain the soil conditioner. The soil conditioner prepared by the process disclosed by the invention not only can more efficiently and quickly fix sodium, potassium, calcium and magnesium ions in soil, but also can reduce the content of carbonate ions, so that the salt content of the soil is reduced, and the alkalinity of the soil is reduced. In addition, the soil conditioner disclosed by the invention is also beneficial to relieving the alkali and salt returning phenomenon of the soil, and the use amount of the conditioner in the subsequent continuous soil improvement process is reduced.

The invention discloses a silicon wafer polishing composition and application thereof. The silicon wafer polishing composition comprises silicon dioxide hydrosol subjected to special treatment, organic alkali, a pH regulator, an anionic water-soluble polymer and water. According to the silicon wafer polishing composition, the conventional alkaline silica sol is subjected to special treatment, particle residues on the surface of the polished silicon wafer can be greatly reduced, and compared with the prior art, the silicon wafer polishing composition has remarkable advantages.

The invention relates to the technical field of agricultural fertilizers, in particular to a functional sustained and controlled release fertilizer for regulating and controlling productivity of salinized soil and a preparation method thereof. The slow / controlled-release fertilizer is prepared by compounding a fertilizer matrix, a soil conditioner, a water-retaining agent and humic acid, wherein the fertilizer base body comprises a core material, and the surface of the core material is sequentially coated with a chelating layer and a wall material layer from inside to outside; the core material comprises the following components in parts by weight: ammonium sulfate, monoammonium phosphate, potassium sulfate and trace elements; the chelating layer is sodium ethylene diamine tetracetate; and the wall material layer is sodium alginate. The sodium alginate coating material adopted by the fertilizer can control the fertilizer to be slowly released in soil, and after the fertilizer is completely released in the soil, the adopted coated fertilizer is non-toxic and harmless in the soil and is easy to degrade. The chelating layer is arranged between the core material and the wall material and can be chelated to form a connecting structure of the inner layer and the outer layer, so that the strength of the fertilizer matrix particles is improved, the particles have stability, and the slow release effect is favorably exerted.

The invention discloses a saline alkali soil conditioner and a preparation method thereof, and belongs to the technical field of soil improvement. The soil conditioner is prepared from the following raw materials in parts by weight: 100-200 parts of modified phosphogypsum, 5-10 parts of a microbial agent and 10-20 parts of an activating agent, the modified ardealite is prepared by compounding ardealite and modified coal gangue and then modifying with rare earth; the microbial agent is prepared by mixing bacillus subtilis, streptomyces cellulosae and bacillus mucilaginosus. Chemical-physical-biological improvement technologies are combined, so that the physical and chemical properties of the saline-alkali soil are effectively improved, the biological activity of the soil is improved, the growth of crops is promoted, the yield and disease resistance of the crops are improved, and the resource utilization rate of the ardealite is increased.

The invention belongs to the technical field of ferrous metallurgy steelmaking, and particularly relates to a system and method for preventing surface recarburization of a continuous casting high-pulling-speed casting blank and a steel plate. Comprising an amplitude difference control module, a liquid slag layer adjusting module and a casting powder adding module. The amplitude difference control module is used for controlling the liquid level fluctuation amplitude difference of the crystallizer to be within a preset value; the liquid slag layer adjusting module is used for adjusting the thickness of a liquid slag layer in the casting powder to reach a set value; the covering slag adding module is used for adding covering slag to the edge of the crystallizer. According to the method, the liquid level fluctuation amplitude difference of the crystallizer and the thickness of the liquid slag layer are controlled within a certain range, meanwhile, the slag adding mode of the casting powder in the production process is reasonably adjusted, and therefore the problem that molten steel makes contact with a carbon-rich layer on the top of the liquid slag layer is effectively solved, and the production cost is reduced on the premise that continuous casting high-pulling-speed production is not affected. And recarburization on the surface layer of the casting blank can be prevented.

The invention discloses a preparation method of a self-repairing negative carbon cement-based grouting material based on a gradient structure, which comprises the following steps: (1) adding carbide slag into water for fully soaking, then separating out a soaking solution, then introducing excessive carbon dioxide into the soaking solution to convert calcium hydroxide into calcium bicarbonate, and obtaining a mixing solution after completion; and (2) uniformly mixing the mixing liquid, a Portland cement-based grouting material and a microorganism-sodium alginate repair material to obtain the composite grouting material. (3) degassing the composite grouting material, and then carrying out ultrasonic treatment, so that one part of the microorganism-sodium alginate repairing material is diffused to the outer layer of the cement-based grouting material, and the other part of the microorganism-sodium alginate repairing material is embedded into the cement-based grouting material; thus, the characteristic that the concentration of the microorganism-sodium alginate repairing material in the cement-based grouting material is gradually increased from inside to outside and is in gradient distribution is formed, and the self-repairing negative carbon cement-based grouting material is obtained. The grouting material not only can repair shrinkage cracks, but also can fully fill a grouting material void area.

The invention relates to a low-carbon ecological oyster breeding cement substratum and a preparation method thereof, and belongs to the technical field of crossing of aquatic product culture and cement-based materials. The invention aims to solve the problems of high cement consumption, severely poor concrete durability, low efficiency of inducing attachment of oyster larvae, high carbon emission and the like of the oyster attachment base, and the problem that the oyster attachment base for breeding is difficult to prepare due to the existence of coarse aggregate. The invention provides a low-carbon ecological oyster breeding cement substratum, which is prepared from the following components in percentage by weight: 15.0 to 58.8 percent of carbonate gelling material, 29.0 to 71.0 percent of sand and 3.8 to 28.6 percent of water. The carbonate cementing material is adopted, and the dark pigment and the calcium carbonate material are doped, so that the prepared cement-based material is high in capability of inducing attachment of oysters.

The invention relates to the technical field of soil improvement, and discloses a soil improvement fertilizer and application thereof in saline-alkali soil improvement, a preparation method of the soil improvement fertilizer comprises the following steps: mixing cow dung, chicken manure and straw, and carrying out anaerobic fermentation to obtain an organic fertilizer; mixing soybean, corn and seaweed, performing enzyme catalysis treatment, and extracting to obtain an amino acid liquid fertilizer; soaking brown algae in hot water, filtering and concentrating to obtain a seaweed extract; uniformly mixing silicate minerals, natural gypsum powder, the organic fertilizer, the amino acid liquid fertilizer and the seaweed extract, and sequentially drying and crushing to obtain the soil improvement fertilizer. According to the soil improvement fertilizer disclosed by the invention, various components such as the organic fertilizer, the amino acid liquid fertilizer, the seaweed extract, the silicate minerals and the gypsum powder are meticulously proportioned, so that the soil fertility can be remarkably improved, the soil structure is optimized, the growth of plant root systems is promoted, the stress resistance of plants is enhanced, and the sustainable utilization of soil is improved for a long time.

The invention relates to the field of soil improvement, and particularly discloses a soil improvement method for coastal saline-alkali soil. According to the method, a physical method and a biological method are comprehensively utilized for comprehensive treatment of the saline-alkali soil, the large drainage ditch communicated with the surrounding river channel is dug for discharging salt into the river channel, the soil tank and the salt drainage ditch are dug, the plastic permeable blind pipe wrapped with the non-woven fabric is placed in the salt drainage ditch, the salt drainage ditch is backfilled with gravel, and the soil tank is backfilled with planting soil; organic compound fertilizer is evenly sown on the surface of the improved area, after long-time natural rainfall and manual watering, flowing water dissolves salt and alkaline substances in planting soil to form saline-alkaline water, and the saline-alkaline water flows into the plastic permeable blind pipe through the gravel layer and is finally discharged into the large drainage ditch to flow into the river channel. Salt and alkaline substances in the soil above the salt elimination ditch are effectively reduced, the wet soil promotes rapid decomposition of organic fertilizer and effective removal of salt, the improvement time of the saline-alkali soil is effectively shortened, and a good improvement effect can be maintained for a long time.

The utility model discloses a boiler flue gas dry desulfurization device which comprises a desulfurization tank, a flue gas inlet pipe and a flue gas exhaust pipe are respectively arranged on two sides of the desulfurization tank, a manhole is arranged at the front end of the desulfurization tank, a material collecting box is arranged at the bottom end of the desulfurization tank, a medicament box is arranged on one side of the material collecting box, a discharge port is arranged at the bottom end of the medicament box, and a gas outlet is arranged at the bottom end of the medicament box. And a feeding pipe is mounted at the top end of the medicament box. By arranging the material collecting box, the medicament box, the feeding pipe, the feeding motor, the conveying pipe and the spiral packing auger, alkali powder is recycled, the spiral packing auger is driven to rotate by the operation of the feeding motor, the alkali powder in the medicament box is conveyed into the conveying pipe and is fed into the desulfurization tank from the top end, and under the action of gravity, the alkali powder in the medicament box is conveyed into the desulfurization tank. The alkali powder can fall into the material collecting box, and the alkali powder is guided into the chemical agent box by matching with the appearance of the material collecting box, so that the alkali powder is repeatedly used, and the loss and the use cost of the alkali powder are reduced.

The invention discloses a super-sulfate-activated low-carbon cementing material based on alkali-containing solid waste as a raw material and a preparation method thereof. The cementing material comprises the following raw material components in percentage by mass: 30-50% of a red mud precursor cementing material, 34-54% of a solid waste material, 0.5-2% of an alkali activator and 10-20% of a sulfate activator. The application range of a sulfate excited low-carbon cementing material system is expanded, efficient utilization of the red mud can be achieved, alkaline solid waste such as the red mud becomes necessary components, and the problem of shortage of high-quality auxiliary cementing materials and the environmental problem caused by stacking of the red mud can be solved at the same time; the thermally activated red mud in the formula not only provides high-activity aluminum-silicon potential for performance development of the cementing material, but also provides proper alkalinity to make up for strength reduction caused by insufficient alkali in the later stage of the system, and promotes improvement of mechanical strength of the cementing material and densification of a matrix.

The invention belongs to the technical field of high polymer materials, and relates to a mineral reinforced PC / ABS resin composition with thermal stability and a preparation method thereof, the resin composition comprises the following components by weight: 50-70 parts of PC resin, 10-20 parts of ABS resin, 10-20 parts of talcum powder, 2-5 parts of a flexibilizer, and 1-3 parts of an acidic regulator. 0.3-1.0 part by weight of a metal ion complexing agent and 0.5-1.5 parts by weight of an auxiliary agent. The preparation method comprises the following steps: stirring and fully mixing the raw materials in a high-speed mixer, melting and compounding the materials under the conveying, shearing and mixing of screws by a twin-screw extruder, and then extruding, drawing, cooling and pelletizing to obtain the mineral reinforced PC / ABS resin composition with thermal stability. Compared with the prior art, the resin composition disclosed by the invention has excellent mechanical properties and dimensional stability, also has good thermal stability, and is very suitable for being applied to large-size parts, such as the fields of automobile spoilers, laser radomes, OA equipment, household appliances and the like.

The invention discloses a device and a method for producing refined tellurium. The device comprises an electrodeposition tank, a low-position circulating liquid tank, a circulating liquid pump, a precision filter, a high-position circulating liquid tank and a rectifier which are communicated according to a connection relation. The method comprises the following steps: carrying out wet ball milling on tellurium slag and water, pumping obtained slurry into a leaching kettle, adding water for dilution, then adding industrial-grade sodium sulfide for reaction, and filtering to obtain a purified solution; raising the temperature of the purified liquid, adding dilute sulphuric acid for neutralization reaction, and filtering to obtain wet tellurium dioxide; returning the wet tellurium dioxide into the neutralization kettle, adding hot water for repeated washing, and calcining the washed wet tellurium dioxide into dry tellurium dioxide; taking analytically pure sodium sulfide, caustic soda flakes, dry tellurium dioxide and water to react, standing and precipitating after the reaction, and extracting supernatant to obtain electrodeposition liquid; filling the electrodeposition liquid into an electrodeposition cell, starting a rectifier, a liquid circulating pump and a precision filter, setting current and voltage, and starting electrodeposition; tellurium powder, waste electrodeposition liquid and bottom impurities are produced. The problems of low tellurium electrodeposition efficiency, poor tellurium powder quality, low electrodeposition direct recovery rate and the like can be effectively solved.

The invention provides an improvement method of soda saline-alkali soil, and belongs to the technical field of soil improvement. The method comprises the following steps: crushing corn straws, spreading the crushed corn straws on the surface of soda saline-alkali soil according to the addition amount of 15-20 tons / hectare, ploughing, harrowing, ridging, sowing jute seeds, fertilizing, and burying a drip irrigation belt in the middle of a ridge at a position 3-5 cm away from the earth surface. According to the method, the straw returning technology is matched with jute planting, the soil salinity and alkalinity of the soda saline-alkali soil are remarkably reduced, the soil fertility is improved, the soil environment is improved, and the yield and quality of jute are remarkably improved.

This invention relates to the field of heavy metal contaminated water or soil remediation technology, and discloses the application of magnesium-based cementitious materials in heavy metal ion remediation in ultra-stable mineralized environments. This invention can achieve good heavy metal adsorption effects in a short time, without the release of toxic substances or secondary pollution, and is suitable for the remediation of heavy metal contaminated water or soil.

The utility model discloses a harmless treatment system for electrolytic manganese residues, and relates to the technical field of application of solid waste treatment and environmental protection. The innocent treatment system for the electrolytic manganese residues comprises a manganese residue pretreatment system, an activating agent pretreatment system, a pH back-adjusting agent pretreatment system, a treating agent pretreatment system, a reaction system and a recovery system, the manganese slag pretreatment system, the activating agent pretreatment system, the pH back-adjusting agent pretreatment system and the treating agent pretreatment system are respectively connected with the reaction system, and the reaction system is connected with the recovery system. According to the utility model, links of backwashing, crushing, mixing and ammonia absorption are linked, innocent treatment of electrolytic manganese residues is realized, the design is reasonable, the structure is simple, automatic operation can be realized, and the treatment cost is low.

The application discloses a preparation method of a silicate cement porous vegetation concrete material, and comprises the following steps: calcining coal-based kaolin to obtain activated coal-based kaolin; adding the activated coal-based kaolin and a water reducing agent into mixing water, and performing ultrasonic dispersion to form an activated coal-based kaolin suspension; weighing silicate cement, concrete recycled aggregates and fertilizer, and uniformly mixing to form dry materials; uniformly mixing the activated coal-based kaolin suspension and the dry materials, and loading into a mold for forming; and performing film covering and curing. The application is free from the low-alkalinity porous vegetation concrete system of a sulphoaluminate cement used in the preparation of a porous vegetation concrete in the prior art, and utilizes the activated coal-based kaolin after calcination and ultrasonic treatment as a main alkali-reducing agent to reduce the alkalinity of the silicate cement according to the condition that coal-based kaolin resources are rich, and the activated coal-based kaolin is matched with the fertilizer and the concrete recycled aggregates to provide a new material with rich raw material sources and low cost for ecological protection of a slope and a bank.

The invention discloses an ion exchange washing alkaline water recycling system, and relates to the field of water treatment. The system comprises an anion exchanger, a washing alkaline water collection pipeline, an online monitoring unit, a shunting switching unit, a weak acid cation exchange treatment unit, an acid liquid regeneration unit, a pipeline conveying pump, a decarburization unit, an intermediate water tank, a recycling unit and a control unit. The online monitoring unit is arranged at the washing drainage end of the anion exchanger, the water quality of the washing alkaline water is detected in real time, and graded recovery of the washing alkaline water is achieved in combination with the shunt switching unit; the recycled washing alkaline water enters a weak acid cation exchange treatment unit to be subjected to ion exchange treatment so as to reduce the alkalinity of the water body; meanwhile, the weak-acid cation exchange resin is regenerated by utilizing acidic waste liquid generated by regeneration of the cation exchange bed, so that synergistic utilization of acid and alkali resources is realized; the treated water body sequentially passes through the decarburization unit and the middle water tank and then is reused for the pure water preparation system.

The present invention provides a positive electrode mixture layer and a lithium-ion secondary battery that can improve the charge / discharge cycle life. The positive electrode mixture layer contains an active material, a solid electrolyte, and a binder. The active material contains a compound that contains Li, Ni, Mn, Co, and O, and the solid electrolyte contains an oxide that has a garnet-type structure and contains Li, La, and Zr. The positive electrode mixture layer contains an ionic liquid that contains an imidazolium cation and a sulfonyl imide anion. The proportion of the number of Ni atoms with respect to the total number of Li, Ni, Mn, Co, and O atoms that exist in one molecule of the compound is 12.5% or less. The amount of oxide with respect to the positive electrode mixture layer is 1-25 vol%.

The invention discloses a method for spray coating a lithium cobalt oxide positive electrode material and its application, comprising preparing an ether solution of organosilicon, adding a surfactant and a combustion aid to obtain a mixed solution, adding lithium cobalt oxide to the mixed solution to obtain a mixed material, adding the mixed material to a spray combustion device, the mixed material enters a combustion chamber through a carrier gas flow for combustion, and after the reaction is completed, solid materials are collected to obtain lithium cobalt oxide coated with silicon dioxide. The invention uses combustible organosilicon as a coating source, after evenly mixing ether with a lithium cobalt oxide positive electrode material, igniting in a spray combustion device, generating a silicon dioxide coating layer, coating the surface of the lithium cobalt oxide positive electrode material, further generating lithium silicate at high temperature, and reducing the alkalinity of the material surface.

The application discloses a preparation method of aluminum dialkyl hypophosphite with different alkyl groups, and comprises the following steps: (1) dispersing aluminum hypophosphite solid in a low concentration in a solvent system containing alkali metal hydroxide and water, the mass ratio of the aluminum hypophosphite solid to water being 1:20-1000; under the initiation of a free radical initiator, making olefin 1 and the aluminum hypophosphite solid to have an addition reaction at 100-150 DEG C and 0.1-0.3 MPa, and controlling the consumption of the olefin 1 to be sufficient for the reaction of the aluminum hypophosphite solid, so as to prepare an aluminum monoalkyl hypophosphite solution, filtering the precipitate, and collecting the filtrate; (2) continuously feeding olefin 2 different from the olefin 1 into the filtrate, and making the aluminum monoalkyl hypophosphite and the olefin 2 to have an addition reaction under the initiation of the free radical initiator at 100-150 DEG C and 0.1-0.3 MPa, so as to obtain aluminum dialkyl hypophosphite with different alkyl groups. The purity of the aluminum dialkyl hypophosphite with different alkyl groups prepared by the application is above 99.5%.

The invention provides an autotrophic denitrification filter material and a preparation method and application thereof, and belongs to the technical field of water treatment.The autotrophic denitrification filter material comprises the following raw materials: a main body material, an adhesive, a foaming agent and a slow-release agent, and the main body material is sulfur powder, thiosulfate and pyrite powder; the preparation method comprises the following steps: mixing the main materials to obtain a component A, mixing the slow-release agent to obtain a component B, mixing the component A and the component B, adding water, uniformly stirring, adding the adhesive and the foaming agent, heating, uniformly stirring, and granulating to obtain the filter material. The invention provides an autotrophic denitrification filter material as well as a preparation method and application thereof, and aims of obtaining a light filter material and quickly starting biofilm formation are fulfilled.

The invention relates to the technical field of drinking water treatment, and discloses a multifunctional and integrated composite micro-polluted underground water treatment device and method.The device is mainly composed of three main devices including an aeration column, a chemical crystallization circulating granulation fluidized bed and a catalytic oxidation filter column and a matched system; the aeration column aerates the raw water subjected to acid adding treatment to reduce the alkalinity of the raw water, the chemical crystallization circulating granulation fluidized bed can remove hardness, iron and manganese in incoming water, effluent of the crystallization fluidized bed enters the catalytic oxidation filter column to be filtered, and manganese, ammonia nitrogen, bacteria and microorganisms in the water are further removed through an internal catalytic oxidation active filter material; the whole set of system combination of the multifunctional and integrated composite micro-polluted underground water treatment device can achieve the functions of softening, iron removal, manganese removal, turbidity removal, ammonia nitrogen removal, bacteria removal and microorganism removal on micro-polluted underground water, and effluent can directly reach the drinking water standard.

The present disclosure provides a composite lithium extraction adsorbent and a preparation method and application thereof, wherein the composite lithium extraction adsorbent comprises a lithium extraction adsorbent and a modified oxygen evolution catalyst disposed on the surface of the lithium extraction adsorbent, wherein the modified oxygen evolution catalyst comprises a sulfur-containing NiFe-LDH oxygen evolution catalyst. The present disclosure prepares the composite lithium extraction adsorbent by combining the lithium extraction adsorbent and the modified oxygen evolution catalyst, and energizes the composite lithium extraction adsorbent during the lithium extraction adsorption process, so as to ensure that the OH on the surface of the adsorbent is consumed. ‑ Eliminate ClO ‑ It can reduce the adverse effects of adsorbents, reduce the alkalinity of the adsorbent surface, reduce the corrosion of the adsorbent, and increase the service life of the adsorbent.

The invention relates to the technical field of building materials, in particular to solid waste wave-absorbing concrete aggregate, a preparation method and concrete.The solid waste wave-absorbing concrete aggregate is prepared from, by weight, 18%-22% of coal gangue, 4%-6% of lithium slag, 8%-12% of steel slag with the particle size ranging from 0 mm to 5 mm, 17%-23% of steel slag which is subjected to hydrophobic treatment and has the particle size ranging from 5 mm to 10 mm and 40%-50% of steel slag which is subjected to carbonization treatment and has the particle size ranging from 10 mm to 20 mm. According to the aggregate, the preparation method and the concrete, the problem of poor stability can be effectively solved, and the concrete is higher in strength and better in wave absorbing performance.

The present invention provides a polyimide varnish suitable for forming a liquid crystal alignment film, etc., the polyimide varnish can suppress the phenomenon of whitening due to moisture absorption, has little viscosity change, and has excellent storage stability. In addition, it is not easy to produce foreign matter, clogging, etc. when obtaining the film, and the surface roughness of the obtained film is less. In addition, even if it is dried and heated, the original characteristics of the polyimide material can be obtained. A polyimide varnish is characterized in that it contains the following (A) components and (B) components. (A) component: polyimide (A) as an imide product of a polyimide precursor. (B) component: an amine compound (B) having any one of a secondary amino group or a tertiary amino group and any one of a nitrogen-containing aromatic heterocycle or an aromatic hydrocarbon group in the molecule, wherein the amino group is bonded to a non-cyclic aliphatic hydrocarbon group or a non-aromatic cyclic hydrocarbon group.