35 results about "Sodium stannate" patented technology

The invention relates to the field of material technology and discloses a method for preparing a flame-retardant and high-temperature resistant PVC material. The flame-retardant and high-temperature resistant PVC material comprises the following raw materials in parts by weight: a polyvinyl chloride resin, a stabilizer, a plasticizer, a carbonizing agent, a flame retardant and smoke suppressant, a lubricant, and an antioxidant. The carbonizing agent is prepared by amination-modifying cellulose and then compounding it with sodium stannate. The flame retardant and smoke suppressant is diatomaceous earth surface-modified with a phosphorus-containing flame retardant. The hydrogen bond effect between the carbonizing agent and the polyvinyl chloride molecular chain is utilized to form a hydrogen bond cross-linking network, thereby improving the high-temperature resistance and flame retardancy of the polyvinyl chloride, reducing the emission of toxic gases during combustion, reducing air pollution and harm to the human body, and contributing to promoting environmentally friendly and sustainable product design, and expanding the applicable fields of the polyvinyl chloride.

The invention discloses a mesoporous Sn-beta molecular sieve as well as a synthesis method and application thereof. The method comprises the following steps: (1) uniformly mixing an H-beta molecular sieve, alkali, quaternary ammonium salt and anhydrous sodium stannate, and then carrying out hydrothermal treatment; (2) roasting the material subjected to hydrothermal treatment in the step (1); and (3) washing, filtering and drying the roasted material to obtain the final mesoporous Sn-beta molecular sieve product. In the Sn-beta molecular sieve, the content of Sn in a framework is relatively high, the content of lewis acid is relatively high, and a large number of mesopores are contained in a molecular sieve crystal, so that the molecular diffusion performance of reactants is relatively good.

The present invention discloses a method for the simultaneous detoxification of organotin waste and the preparation of sodium stannate. The method comprises mixing the organotin waste with a composite additive comprising sodium oxalate and hydrogen peroxide as active ingredients, followed by spray combustion. The combustion exhaust is subjected to dust removal to recover a tin-rich material, which is then water-leached to obtain a sodium stannate solution. By adding sodium oxalate and hydrogen peroxide during the combustion and decomposition of the organotin waste, the method not only enhances the thermal conversion process of the organotin compound, converting its toxic organic functional groups into harmless CO2 and H2O emissions, but also promotes dioxin decomposition, sulfur fixation, and suppresses NOx generation. Furthermore, the method efficiently converts tin into sodium stannate, which is easily recovered by water leaching. The method is simple to operate, highly efficient, and environmentally friendly.

The present application relates to a kind of ultrasonic reinforced sodium stannate preparation method of tin oxide sheet low temperature, belong to sodium stannate preparation technical field.The present application will high-purity tin sheet be added to sodium hydroxide solution, under the condition of ultrasonic wave, control sodium hydroxide solution temperature is 20~30 ℃, slowly add hydrogen peroxide to 20~30% of preset total addition amount after continuing ultrasonic reinforced oxidation reaction 7~10min;Again, slowly add hydrogen peroxide after multiple times, continue ultrasonic reinforced oxidation reaction, the addition amount of hydrogen peroxide is 10~15% of preset total addition amount each time, ultrasonic reinforced oxidation reaction 4~8min after each hydrogen peroxide is added;Hydrogen peroxide is completely added according to preset total addition amount, continue ultrasonic reinforced oxidation reaction until tin sheet completely dissolves and obtains sodium stannate solution;Sodium stannate solution is filtered, concentrated, separated, washed, dried in turn and obtains sodium stannate product.The present application strictly controls oxidation reaction temperature to 20~30 ℃, reduces hydrogen peroxide volatilization, uses ultrasonic to reinforce hydrogen peroxide oxidation effect, improves tin dissolution effect.

The application relates to the field of coating materials, and discloses a pure titanium material coating sensor for detecting low-concentration ammonia gas as well as a preparation method and application of the sensor. The sensor comprises a pure titanium material, a micro-arc oxidation coating and an electrode; the micro-arc oxidation coating is arranged on the surface of the pure titanium material through micro-arc oxidation of a sodium silicate, sodium stannate trihydrate and zinc acetate electrolyte; and the electrode is arranged on the micro-arc oxidation coating. The SnO2 / TiO2 coating capable of being applied to the detection of low-concentration ammonia gas under a high-humidity environment is formed on the surface of the pure titanium material through micro-arc oxidation of the composite electrolyte of sodium silicate, zinc acetate and sodium stannate trihydrate; the electrode is arranged, and the oxygen adsorption-desorption principle is utilized for detection; compared with conventional gases, the sensor exhibits excellent sensitivity and selectivity to ammonia gas, and therefore can effectively, timely and simply detect ammonia gas.

The invention provides a soldering-aid formula for coating lead on a copper terminal of a lead-acid storage battery, which is characterized by comprising the following components in parts by mass: 40-50 parts of pure water, 10-15 parts of phosphoric acid, 9-11 parts of sodium stannate, 4-6 parts of ammonium nitrate, 1-3 parts of potassium permanganate, 4-6 parts of ethylenediamine tetraacetic acid and 15-20 parts of glycerol, and the mass fraction of sodium stannate in a soldering-aid tinning aqueous solution prepared by the formula is 6-12%. According to the invention, the surface tension of lead liquid can be effectively destroyed, the surface activity of a copper piece is improved, and meanwhile, the formula has a tin plating function, so that a tin-containing compound is formed on the surface of the copper piece at high temperature, and the strength between a copper terminal and lead is enhanced.

The invention provides a process for preparing butanedioic anhydride through maleic anhydride hydrogenation, and belongs to the technical field of catalysts, a maleic anhydride solution and hydrogen are introduced into a trickle bed reactor with a catalyst for a reaction, and a preparation method of the catalyst comprises the steps that hexadecyl trimethyl ammonium bromide, sodium silicate and sodium stannate tetrahydrate are dissolved in water and stirred, and a first solution is obtained; dissolving zinc sulfate heptahydrate in water, and dropwise adding stronger ammonia water until white precipitate disappears to obtain a second solution; adding the second solution into the first solution, then adding ethylenediamine tetraacetic acid, adjusting the pH value to 9.0-9.5, stirring for 3-5 hours, and carrying out hydrothermal aging at 120 DEG C for 70 hours to obtain a product; centrifugally separating the product to obtain a solid, roasting at 500 DEG C for 6 hours, and cooling to obtain a zinc-tin co-doped mesoporous carrier; nickel chloride hexahydrate is dissolved in water, the zinc-tin co-doped mesoporous carrier is added, stirring, ultrasonic treatment, filtering, drying and firing are performed, and the catalyst is obtained. The activity, selectivity and stability of the catalyst are improved, and it is ensured that high maleic anhydride conversion rate and succinic anhydride selectivity are kept for a long time.

This invention discloses a full-ocean-depth metal-seawater fuel cell. The metal anode material mainly comprises one or more of the following components: Mg, Sn, B, La, Ce, Pr, Nd, Dy, Sm, Ti, and Ca, with the balance being Al. The electrolyte of this invention is a mixed aqueous solution of natural seawater, sodium stannate, zinc oxide, zinc sulfate, sodium carbonate, and cerium chloride, with the pH adjusted to between 12 and 14. The metal anode of this invention, in the above electrolyte, not only significantly reduces the hydrogen evolution corrosion rate but also directionally induces product formation, thereby improving electrochemical performance. The preparation method of this metal anode and electrolyte is simple, applicable to different temperature and pressure variations and operating current densities, and can be applied to metal-seawater fuel cells under various operating conditions at full ocean depth.

The invention belongs to the technical field of surface treatment, and particularly relates to a cyanide-free lead-free cupronickel tin electroplating process which comprises the following steps: adding methionine copper, sodium stannate, potassium hydroxide, zinc oxide, potassium carbonate, conducting salt, a brightener, sodium phosphite, 3-aminobenzoic acid ethyl ester methyl sulfonate and a wetting agent to form a plating solution; starting mechanical stirring, heating to a required temperature, putting the workpiece into the plating solution, electroplating, and controlling the current density, the metal ion concentration of the plating solution and the temperature to be within a preset range. According to the copper methionine serving as a copper source, copper is coordinated and combined with amino and carboxyl of methionine to form stable inner complex salt, and the advantage of remarkable hydrolysis resistance is achieved. And multiple coordination groups of methionine anions are chelated with Cu < 2 + >, so that free Cu < 2 + > is stabilized, and refining of coating crystallization is assisted. Sodium phosphite focuses on binding with stannate ions to reduce the reduction potential of tin, and ethyl 3-aminobenzoate methyl sulfonate is preferentially chelated with Cu < 2 + > to improve the reduction potential of copper, so that the problem of large potential difference between copper and tin is solved.

The invention provides a method for recovering copper, lead and tin from a waste photovoltaic welding strip, and belongs to the technical field of resource regeneration and nonferrous metallurgy. According to the method, the waste photovoltaic welding strip serves as a cathode, an inert material serves as an anode, direct-current voltage of 2.5 V or above is applied to molten sodium hydroxide for an electrolytic reaction, lead-tin alloy on the surface of the photovoltaic welding strip is selectively stripped and deposited at the bottom of molten salt in the electrolytic process, and a copper matrix is kept complete. After electrolysis is finished, elemental lead powder and filtrate containing sodium stannate can be obtained through water dissolution treatment. The method has the advantages of being efficient, green, easy and convenient to operate, remarkable in separation effect and the like, the adaptability to the form and loading mode of the photovoltaic welding strip is high, the morphology difference of copper, lead and tin products is obvious, and follow-up extraction and resource utilization are facilitated.

The invention discloses a tin disulfide negative electrode material for a lithium ion battery and a preparation method of the tin disulfide negative electrode material, and belongs to the technical field of lithium battery negative electrode materials. The preparation method comprises the following steps: dissolving sodium stannate (chlorine-free tin source) and thiourea (chlorine-free sulfur source) in deionized water, adjusting the pH value to 1-3 by dilute sulphuric acid, adding melamine (20% by mass of sodium stannate), and stirring to obtain a precursor solution; and transferring into a magnetic stirring autoclave, reacting at 180-220 DEG C for 6-10 hours, and carrying out centrifugal washing (alternating deionized water and absolute ethyl alcohol) and vacuum drying (at 50-70 DEG C, 7-12 hours) on the product to obtain the nitrogen-doped flower-like tin disulfide powder. The method puts an end to chloride ions, solves the problem of equipment corrosion, does not need complex post-treatment, and is short in process and low in cost; due to the nitrogen doping and layered structure, the product is excellent in cycling stability (the capacity retention rate of 300 circles is 97.6%) and rate performance, and an industrialization scheme is provided for a high-performance lithium battery negative electrode material.

The application relates to the field of coating materials, and discloses a pure titanium material and a preparation method and application thereof. The surface of the pure titanium material is provided with a coating formed through micro-arc oxidation of an electrolyte of sodium silicate and zinc acetate, and an electrode with a connecting wire is arranged on the coating. The application carries out micro-arc oxidation through a composite electrolyte of sodium silicate and zinc acetate or sodium stannate, forms a ZnO / TiO2 coating capable of being applied to ammonia detection on the surface of the pure titanium material, detects through setting of the electrode and utilization of an oxygen adsorption-desorption principle, and the coating exhibits excellent sensitivity and selectivity to ammonia compared with conventional gases, so that the ammonia can be effectively, timely and simply detected.

This invention belongs to the field of electrochemical energy storage, and discloses a molybdenum / tin selenide / sulfur-nitrogen co-doped graphene composite material, its preparation method, and a lithium-ion energy storage device. The invention uses graphene oxide, sodium molybdate tetrahydrate, sodium stannate trihydrate, thiourea, and dicyandiamine as raw materials, and prepares the composite material using a simple hydrothermal method and heat treatment in an argon / hydrogen mixed atmosphere. The method is simple and low-cost. The prepared molybdenum / tin selenide (MoSe2-SnSe) nanoparticles loaded on sulfur-nitrogen co-doped graphene form a three-dimensional hierarchical composite structure, which can effectively improve the conductivity of the electrode material and alleviate the volume expansion effect of the electrode material during charge and discharge, thereby achieving the goal of improving the electrochemical performance of lithium-ion batteries and lithium-ion hybrid capacitors.

The method comprises the following steps: treating tin-containing wastewater generated in a process for producing beta-thymidine through condensation reaction of thymine and tetraacetyl ribose by using a mixed alkali aqueous solution consisting of ammonia water and tetramethylammonium hydroxide, and then settling and separating to obtain colloidal water-containing tin hydroxide; the preparation method comprises the following steps: mixing colloidal water-containing tin hydroxide and solid sodium hydroxide, heating and co-melting to convert the colloidal water-containing tin hydroxide and the solid sodium hydroxide into a sodium stannate-containing mixed material, and sequentially extracting with deionized water and filtering or centrifugally separating to obtain a sodium stannate-containing aqueous solution; the aqueous solution containing sodium stannate is subjected to concentration, cooling crystallization and filtration or centrifugal separation to obtain a sodium stannate wet solid material and an aqueous solution containing sodium stannate, and the sodium stannate wet solid material is subjected to vacuum drying to obtain a finished product sodium stannate meeting quality requirements. And sequentially adding barium chloride into the aqueous solution containing sodium stannate for precipitation, filtering or centrifugal separation, deionized water washing and vacuum drying to obtain a barium stannate product meeting the quality requirement.

The application belongs to the technical field of gas sensors, and particularly relates to a n-butanol gas sensor composite material and a preparation and use method thereof. The response effect of single In2O3 and CoSnO3 on n-butanol is not ideal in the prior art. A precursor CoSn(OH)6 is prepared by using a cobalt sulfate and sodium stannate aqueous solution, an In(OH)3 precursor is prepared by hydrothermal reaction of an indium nitrate aqueous solution, CoSn(OH)6 is mixed with In(OH)3 and then ground and calcined to obtain a CoSnO3-In2O3 composite material. The sensor prepared from the composite material has high sensitivity, good selectivity and repeatability to n-butanol at 250 DEG C, and the detection limit is as low as 20 ppb, and has good practical application value.

The invention relates to a method for directly preparing sodium stannate from a tin stripping liquid, which comprises the following steps: (1) carrying out first alkali treatment on the tin stripping liquid, and carrying out solid-liquid separation to obtain copper oxide mud and an alkali treatment liquid; (2) sequentially carrying out neutralization treatment, solid-liquid separation and water washing treatment on the alkali treatment liquid to obtain tin sludge; and (3) carrying out second alkali treatment and evaporative crystallization treatment on the tin sludge to obtain sodium stannate. According to the method disclosed by the invention, soluble impurities are removed by adopting neutralization treatment and water washing treatment methods, so that recycling of copper and direct preparation of sodium stannate can be realized at the same time, and the method has relatively great advancement and economical efficiency.

This invention discloses a vermiculite-based flame-retardant and smoke-suppressing filler, its preparation method, and its application in silicone foam, belonging to the technical field of flame retardant and flame-retardant material preparation. This invention utilizes expanded vermiculite, sodium stannate, zinc sulfate, etc., as raw materials, and synthesizes zinc hydroxystannate nanoparticles on the surface of expanded vermiculite via an in-situ precipitation method, obtaining a flame-retardant and smoke-suppressing functional filler composed of zinc hydroxystannate encapsulating expanded vermiculite. The synthesis of this filler is completed in an aqueous phase, the preparation process is simple and environmentally friendly, and it exhibits good compatibility with silicone foam, effectively improving its flame-retardant and smoke-suppressing properties, showing broad application prospects in flame-retardant and smoke-suppressing silicone foam.

The invention provides a method for preparing sodium stannate from a waste tungsten (tungsten carbide) tin alloy, which comprises the following steps: (1) uniformly mixing a waste tungsten (tungsten carbide) tin alloy raw material and a carbonaceous reducing agent, putting into a crucible of a vacuum furnace, covering with a furnace cover, and opening an exhaust port; (2) heating to burn the reducing agent; (3) after the reducing agent is completely combusted, closing an exhaust port, opening a direct exhaust pipeline, and vacuumizing; (4) the pressure in the furnace is reduced to lt; when the pressure is 5 Pa, a direct exhaust pipeline is switched into a tin powder preparation pipeline, the temperature is increased to 1550-1700 DEG C, a heat preservation reaction is conducted, and the reaction time is longer than or equal to 20 min; and (5) after the reaction is finished, taking out the product, the tungsten or tungsten carbide skeleton and the sheet for other purposes, dissolving tin powder with a sodium hydroxide solution, and preparing sodium stannate according to a traditional process. The method has the advantages of being short in process, low in energy consumption, high in recovery rate, low in cost and good in benefit, and the problems of efficient recovery and utilization of the waste tungsten (tungsten carbide) tin alloy and low-cost preparation of sodium stannate can be solved.

The invention relates to a cyanide-free brass tin electroplating process which comprises the following steps: adding basic cupric carbonate, zinc oxide, sodium stannate, conducting salt, potassium hydroxide and potassium carbonate into a plating tank, and dissolving in deionized water; then adding a brightening agent, a complexing agent and a wetting agent, and adding deionized water to a set liquid level of the plating solution; the workpiece is put into the plating solution for electroplating, and the metal ion concentration, the current density and the temperature of the plating solution are controlled to be within the preset range; the brightener comprises the following components in percentage by mass: 0.5% of nicotinic acid, 1% of polyethyleneimine and 98.5% of deionized water; the wetting agent is an alkyl polyglucoside solution with the mass concentration of 0.5%. The active groups of nicotinic acid can slow down the reduction rate of metal ions, refine plating grains, improve the bright effect of the plating and reduce the porosity. The polyethyleneimine can optimize the crystal structure of the coating, disperse impurities to avoid the formation of rigid defect points, and improve the flexibility of the coating. The alkyl polyglucoside can reduce the surface tension of the plating solution, so that the workpiece is uniformly soaked by the plating solution, bubble retention is avoided, and the flatness of a plating layer is improved.

The invention provides a preparation method of a zinc hydroxystannate coated red phosphorus flame retardant, which comprises the following steps: (1) dissolving zinc salt in water to prepare a solution A, dissolving sodium stannate in water to prepare a solution B, and dispersing red phosphorus and triethanolamine in water to prepare a suspension C; (2) under the condition of continuous stirring, dropwise adding the solution A and the solution B into the suspension C at the same time, and reacting for 1-6 hours; and (3) dehydrating and drying the precipitate to obtain the zinc hydroxystannate coated red phosphorus flame retardant. The zinc hydroxystannate coated red phosphorus flame retardant provided by the invention has the characteristics of high whiteness and excellent flame retardance, and can be applied to processing of light-color high polymer material products.

The utility model discloses a device for filtering sodium stannate impurities, which comprises a filter cartridge and a filter element, four groups of liquid outlet grooves are arranged at the bottom of the filter cartridge, threaded plugs are in threaded connection with the inner walls of the four groups of liquid outlet grooves, the threaded plugs are fixedly mounted at the bottom of a core seat, and the filter element is sleeved on the outer side of the core seat. And a guide hole for communicating the liquid outlet groove with the filter element is formed in the center of the element seat. According to the sodium stannate impurity filtering device disclosed by the utility model, the core seat is convenient to disassemble due to the threaded plug in threaded connection, so that the core seat and the filter core can be conveniently assembled and disassembled as a module, and the filter core can be locked on the outer side of the core seat through the connection of the second bolt; the arrangement of bolt connection facilitates the disassembly, replacement and cleaning of the filter element, and the clamping connection between the positioning seat and the positioning groove can play a role in positioning in advance so as to facilitate point finding and positioning.

The invention relates to an aluminum alloy surface environment-friendly chemical passivator and a preparation method and application thereof, and belongs to the technical field of metal surface treatment. The passivating agent is in a liquid state and is prepared from the following raw materials: 60 g / L-80 g / L of potassium permanganate, 36 g / L-54 g / L of aluminum sulfate, 0.9 g / L-1. 2 g / L of a stabilizer, 100 ml / L-200 ml / L of concentrated sulfuric acid and the balance of water in each liter of solution; the stabilizer is prepared from sodium stannate, sodium pyrosulfate and 8-hydroxyquinoline; the passivator is prepared by fully mixing the raw materials. According to the application method, the aluminum alloy with the clean and dry surface is soaked in the passivating agent, and a passivation layer can be formed on the surface of the aluminum alloy; the treatment time of the application is shortened to 0.5 min-2 min, meanwhile, the applicable temperature range is expanded to 35 DEG C-50 DEG C, and the feasibility of industrial production is greatly improved.

The invention discloses a preparation method of a gold-loaded perovskite-like material. The preparation method comprises the following steps: adding zinc acetate into water; then adding sodium stannate, and stirring for half an hour; heating the mixed solution in an air dry oven; after the reaction is completed, cleaning the sample; then drying to obtain a precursor zinc hydroxystannate; placing the sample in a muffle furnace, heating, and annealing to obtain a zinc stannate catalyst; the method comprises the following steps: adding a zinc stannate catalyst into a methanol-containing aqueous solution, stirring, then adding a chloroauric acid aqueous solution, illuminating by a xenon lamp, and stirring; and after the reaction is finished, filtering and collecting a sample, and drying to form Au-ZnSnO3. According to the invention, gold is loaded on the surface of the ZnSnO3 catalyst, so that the problems of insufficient charge migration rate and active sites of a piezoelectric catalytic material are solved, and the efficient performance of producing hydrogen by piezoelectric catalytic decomposition of water is realized. And gold is loaded on the surface of the ZnSnO3 catalyst, so that free charge migration is improved, active sites of the reaction are also provided, and the piezoelectric catalytic hydrogen production rate is further improved.

The invention discloses a metal lead-zinc-tin recovery system and a recovery method thereof, and relates to the technical field of metal recovery. The system comprises a feed pretreatment unit, a chemical stripping reactor connected with the feed pretreatment unit, a solid-liquid separation device connected with the chemical stripping reactor, an impurity purification reduction tank connected with a filtrate outlet of the solid-liquid separation device, and an electrolytic recovery tank connected with the impurity purification reduction tank, the residue treatment unit is connected with a solid outlet of the solid-liquid separation device, and the solution circulation pipeline is connected with an electrolyte outlet of the electrolytic recovery tank and an alkali liquor supply port of the chemical stripping reactor. According to the method, the graded recovery process of alkaline leaching, purification, electrolysis and smelting is adopted, tin is selectively dissolved out in a sodium stannate form preferentially, lead and zinc are reserved in a solid phase, primary efficient separation of tin and lead and zinc is achieved, then impurity purification and reduction treatment is conducted on a tin-containing liquid phase, and the purity of the electrolyte is remarkably improved.

The invention relates to the technical field of valuable metal recovery, in particular to a method for extracting tin from tin slag. The method comprises the following steps: firstly, dry-mixing the tin slag with NaOH and KOH, then carrying out ball milling, then adding sodium nitrate into the mixture in a mass ratio of the tin slag to the sodium nitrate of 1: (0.02-0.03) for multiple times, mixing, reacting at 400-600 DEG C for 1-4 hours, and cooling to room temperature after the reaction is completed, so as to obtain molten slag; the molten slag is crushed into powder, the powder and water are mixed and leached, the mixture reacts for 1-3 h at the temperature of 40-60 DEG C, tin-containing leachate is obtained after solid-liquid separation, and the leaching rate of tin in the tin slag is larger than or equal to 90%. According to the method, sodium hydroxide and sodium nitrate are adopted as a mixed solvent, tin is preferentially converted into soluble sodium stannate, compared with a traditional acid leaching method, the corrosivity is lower, compared with a traditional alkali melting method, the reaction is more sufficient, compared with a pyrogenic smelting method, the energy consumption is reduced by adopting a medium-temperature reaction, the technological process is short, and the efficiency is high.

The utility model discloses a protective device for preparing sodium stannate, which comprises a protective device main body, the lower end of the protective device main body is fixedly connected with a blanking bin, the lower end of the blanking bin is connected with a material taking mechanism in a penetrating manner, and the material taking mechanism is fixedly connected with the protective device main body. The upper end of the protection device body is slidably connected with an upper sealing door. According to the protective device for sodium stannate preparation, through cooperation of a rotary knob, a connecting shaft and a gear, it can be guaranteed that one set of the upper sealing door and the lower sealing door is closed all the time, and therefore air is prevented from entering the protective device body to oxidize tin powder, and through cooperation of a handle and a pull rod, the protective device is convenient to use. And a push block can conveniently extrude a spring to move, tin powder can fall into the sealing box body under the influence of gravity, and when the tin powder is pushed out of the sealing box body, the push block can block the discharging bin, so that air is prevented from entering the protection device main body through the discharging bin.

The application relates to the technical field of lithium ion batteries, and particularly discloses a zinc metatitanate negative electrode material and a preparation method and application thereof, which comprises the following steps: S1, sodium stannate and zinc acetate and urea are dissolved in a mixed solution of ethanol and deionized water, and after uniform mixing, zinc metatitanate powder is obtained through hydrothermal treatment, centrifugal drying and calcination; S2, a lithiation reagent and metal lithium are dissolved in a tetrahydrofuran solvent to obtain a chemical prelithiation reagent solution, and the prelithiation reagent solution at least comprises diphenyl, lithium and tetrahydrofuran; S3, the prepared zinc metatitanate powder is reacted in the chemical prelithiation reagent solution or in the chemical prelithiation reagent vapor, and after vacuum drying, zinc metatitanate negative electrode material is collected. Through a prelithiation method, a uniform SEI film is generated on the surface of the zinc metatitanate material, the material surface can be effectively protected, and the occurrence of irreversible reactions can be reduced, so that the first-cycle coulombic efficiency and the cycle stability of the negative electrode material are improved, and the cycle performance can be improved.

The invention discloses a method for recovering copper and tin from tin stripping waste liquid step by step, which comprises the following steps: firstly, adding an alkaline regulator into the tin stripping waste liquid to control the pH value, then adding a precipitator to enable copper ions to form precipitates, and carrying out plate-frame pressure filtration after flocculation of PAC and PAM to obtain copper sludge and copper-removed liquid; adding excessive iron powder into the copper-removed liquid to reduce tin ions into sponge tin, and filtering to obtain a tin-iron mixture filter cake; and finally, mixing the tin-iron mixture with sodium hydroxide and sodium nitrate in proportion, carrying out a melting reaction, leaching with hot water, filtering and separating to obtain a sodium stannate solution and reduced iron powder, and respectively crystallizing and drying to obtain industrial-grade sodium stannate and reduced iron powder products.

The present invention discloses a method for preparing antimony oxide / tin oxide composite nanowires, belonging to the field of nanomaterial technology. The preparation method comprises heating sodium stannate, antimony acetate, citric acid, and deionized water in a water bath to obtain a uniform sol; then reacting the sol in a sealed reaction vessel to obtain a precursor for the antimony oxide / tin oxide composite nanowires; and finally reacting the precursor and nano-indium in the high-temperature and low-temperature zones of a two-stage tubular furnace to obtain the antimony oxide / tin oxide composite nanowires. The composite nanowires are composed of tetragonal SnO2 and orthorhombic Sb2O3 crystal phases, with a diameter of 50 to 150 nm and a length greater than 5 μm. The present invention utilizes a multi-step preparation process that is easy to control. The resulting composite nanowires have broad application prospects in semiconductor devices, electrochemical sensors, catalysts, supercapacitors, batteries, and other fields.

The application discloses a method for preparing crystals in a sodium stannate production process, which comprises the following steps: adding a sodium stannate solution into a sodium stannate crystallization device, heating and concentrating to reach a saturation concentration, and then adding an alkaline substance to make sodium stannate crystallize and precipitate. The sodium stannate crystallization device comprises a reaction bin, a discharging mechanism and a stirring mechanism. In the application, the alkaline substance is placed on a discharging table, and then is sent to the outside of a screw post through a screw. A transmission belt drives a worm to rotate under the rotation of a motor. The teeth of the side wall of the worm drive a worm wheel to rotate. The screw post starts to rotate under the drive of the worm wheel. The threads on the outer wall of the screw post can transport the objects on the object table to a feeding pipe. The objects enter the reaction bin through the feeding pipe. The work of the staff is simple, and the work efficiency is improved. The transportation of the reaction substances by the screw post can be controlled through the motor. The amount of the reaction substances can be controlled by rotating the motor output end by a specific number of times, and the work efficiency is further improved.