918 results about "Sodium oxide" patented technology

A fireproof magnesium oxide board is prepared by mixing the following raw materials, the raw material names and weight parts are as follows: 80-100 parts of magnesium oxide; 20-30 parts of anhydrous magnesium chloride; 10-20 parts of modified expanded vermiculite foaming agent; 20-30 parts of aluminum silicate fiber; 5-10 parts of sawdust; 10-15 parts of fly ash; 8-12 parts of glass magnesium board crushed powder; 1.5-5 parts of non-woven fabric; 10-20 parts of water; wherein the modified expanded vermiculite is prepared by the following steps: (1) Vermiculite is incompletely expanded and calcined; (2) acrylic acid monomer, sodium hydroxide, acrylamide monomer, initiator potassium persulfate, crosslinking aid pentaerythritol polyglycidyl ether, incompletely expanded vermiculite, and water are taken, stirred evenly and ultrasonically dispersed to obtain a first reaction solution, which is placed in a reactor for reaction to obtain a gel material; (3) the gel material is preliminarily crushed and dried, and then further crushed in a ball mill to obtain a fire-resistant expanded vermiculite with water absorption performance.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for preparing fiber-reinforced coal gangue-based composite functional aerogel. After being activated, the coal gangue is put into an acid leaching solution to be leached, and an aluminum-rich solution is obtained; adding ammonia water into the aluminum-rich solution to adjust the pH to obtain hydroxide precipitate; adding a sodium hydroxide solution into the precipitate to react to obtain a sodium aluminate solution; neutralizing the sodium aluminate solution with hydrochloric acid to obtain an aluminum chloride solution, stirring to obtain aluminum sol, and adding ceramic fibers into the aluminum sol; violently stirring the sol, and adding epoxypropane to obtain wet gel; after aging the wet gel, carrying out surface modification to obtain hydrophobic coal gangue-based aluminum oxide and composite wet gel of the hydrophobic coal gangue-based aluminum oxide; and drying the modified wet gel at normal pressure to obtain the hydrophobic coal gangue-based aluminum oxide and the composite aerogel thereof. Ceramic fibers are introduced as a reinforcing phase, so that the compressive strength and toughness of the material are improved; the composite aerogel is subjected to surface modification, uniform modification is ensured, the contact angle is remarkably increased, the hygroscopicity is reduced, and the stability of the material is enhanced.

The invention discloses high-toughness ultrathin flexible glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The ultrathin flexible glass is prepared from the following raw materials: silicon dioxide, aluminum oxide, lithium oxide, sodium oxide, magnesium oxide, a modified nano reinforced phase, a high-temperature melting regulator and cerium dioxide. The modified nano reinforced phase is prepared by the following steps: pre-treating silicon carbide and silicon nitride with hydrochloric acid, and mixing with nano zirconium oxide to obtain a mixture; and modifying the mixture with a silane coupling agent to obtain the modified nano reinforced phase. The high-temperature melting regulator is a mixture of lithium borate, sodium sulfate and lithium fluoride. The preparation method of the ultra-thin flexible glass comprises the following steps: preparing the modified nano reinforced phase, melting and homogenizing the glass, forming the glass substrate, and preparing the ultra-thin flexible glass. The ultra-thin flexible glass prepared by the invention has relatively high fracture toughness and structural rigidity, excellent flexibility and bending fatigue durability, and excellent thermal shock resistance.

The invention belongs to the technical field of glass materials, and discloses thermal shock resistant transparent high borosilicate glass which comprises the following components in percentage by weight: 60-70% of silicon dioxide, 18-22% of diboron trioxide, 4-7% of aluminum oxide, 3-5% of magnesium oxide, 2-4% of alkali metal oxide, 0.5-1.5% of nano silicon nitride and 0.5-1% of nano aluminum titanate. The thermal shock temperature difference of the glass within the temperature change range of 20-200 DEG C is larger than or equal to 180 DEG C, the light transmittance within the visible light range of 400-760 nm is larger than or equal to 85%, the alkali metal oxide is composed of sodium oxide and potassium oxide, the weight ratio of the sodium oxide to the potassium oxide is 1: 1-3: 1, the average particle size of the nanometer silicon nitride is smaller than or equal to 100 nm, and the nanometer silicon nitride is evenly dispersed in the glass matrix; according to the thermal-shock-resistant transparent high borosilicate glass and the preparation method thereof, the thermal shock resistance and light transmittance of the glass are improved by optimizing the chemical components of the glass and adding the special nanoparticles in cooperation with a specific preparation process, and the thermal shock resistance of the glass is improved. The problems that existing high borosilicate glass is insufficient in thermal shock resistance and low in light transmittance in a high-temperature environment are solved.

The invention discloses a method for synthesizing a Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst by adopting a solvothermal method, and belongs to the technical field of catalysts. The preparation method comprises the following steps: preparing copper molybdenum sulfide by using cuprous oxide as a template, synthesizing copper molybdenum sulfide with high purity and good crystallinity by combining a solvothermal method, preparing manganese cadmium sulfide by using manganese acetate, cadmium acetate, sodium hydroxide and thioacetamide as raw materials, adding copper molybdenum sulfide before a hydrothermal reaction, successfully modifying the manganese cadmium sulfide by constructing a heterojunction, and preparing the copper molybdenum sulfide modified manganese cadmium sulfide. The Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst is synthesized, and the photocatalytic hydrogen production rate of the cadmium manganese sulfide is improved. Moreover, the hydrogen production rate of the Mn0. 43Cd0. 57S / Cu2MoS4 photocatalyst prepared by the invention can reach 8233 mu mol / (g.h), which is 2.08 times of the hydrogen production rate of pure cadmium manganese sulfide, and 1.24 times of the hydrogen production rate of cadmium manganese sulfide loaded with 1% platinum.

The invention discloses high-strength high-temperature-resistant fireproof industrial glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The industrial glass is prepared from the following raw materials: silicon dioxide, boric oxide, aluminum oxide, sodium oxide, potassium oxide, niobium phosphate, a composite reinforcing component and a clarifying agent, the composite reinforcing component is prepared from hafnium oxide, gadolinium oxide and zinc oxide; the clarifying agent is obtained by mixing cerium dioxide and tin oxide. The preparation method of the industrial glass comprises the following steps: preparing functional components, melting glass, forming a glass substrate, and preparing the industrial glass. The prepared industrial glass is high in strength, good in high-temperature stability and excellent in fireproof performance.

The invention discloses low-carbon red-mud-based alkali-activated foam concrete and a preparation method thereof, and belongs to the field of low-carbon foam concrete. Specifically, the mix proportion and the preparation method of the low-carbon red-mud-based alkali-activated foam concrete are as follows: P.O42.5 ordinary Portland cement provided by building materials in Qingdao Weidong macro, the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd., and Jinshu New Material Co., Ltd., the I-grade fly ash is S95-grade granulated blast-furnace slag produced by Henan Province Platinon Casting Material Co., Ltd. The Bayer process red mud powder is produced by Hebei Province Shihozhuangfei Mine Product Co., Ltd. The exciting agent is selected from an industrial liquid sodium silicate solution produced by Henan Jinmoistening New Material Co., Ltd. And solid sodium hydroxide particles with AR analytical purity of 96%; the admixture is selected from a TR-26C type polycarboxylate superplasticizer produced by Henan Fuhua Information Science and Technology Co., Ltd. And the foaming agent is a TR-E type animal protein foaming agent produced by Henan Zhuichun Information Science and Technology Co., Ltd. Compared with existing foam concrete, the low-carbon alkali-activated foam concrete provided by the invention uses a large amount of industrial solid waste, reduces the use cost, reduces the use amount of cement under the condition of ensuring the compressive strength, and is simple and convenient to operate, reasonable in process, low-carbon, environment-friendly, rapid in cement setting and hardening, and suitable for large-scale use.

The invention relates to the technical field of electronic glass fiber materials, and particularly discloses a corrosion-resistant low-dielectric glass fiber and a preparation process thereof. A preparation process of corrosion-resistant low-dielectric glass fibers comprises the following steps: S1, uniformly mixing glass fiber raw materials, melting, clarifying, homogenizing, cooling, and carrying out wiredrawing treatment to obtain glass fiber precursors; and S2, sequentially carrying out plasma treatment and impregnating compound treatment on the glass fiber precursor, drying and curing to obtain the corrosion-resistant low-dielectric glass fiber, silicon dioxide, aluminum oxide, magnesium oxide, boric oxide, calcium fluoride, tin oxide, sodium oxide, potassium oxide and rare earth oxide are used as glass fiber raw materials, and the rare earth oxide is a mixture of gadolinium oxide, cerium oxide and samarium oxide. The obtained glass fiber has excellent low dielectric property and corrosion resistance, and has a wide market prospect.

The invention discloses high-performance asphalt-based porous carbon and a preparation method and application thereof.The preparation method comprises the following steps that refined asphalt is heated and stirred, then oxygen-containing gas is introduced, and oxygen-containing modified pre-oxidized refined asphalt is obtained through segmented heating oxidation treatment; heating the pre-oxidized asphalt to different temperatures in different stages in an inert atmosphere for pre-carbonization; placing the pre-carbonized product in a hydrogen-containing mixed atmosphere, and dynamically regulating and controlling the carbonization process according to asphalt components; and mixing the carbonized product with potassium hydroxide and sodium hydroxide mixed alkali, carrying out multi-temperature-zone stepped activation, washing, and drying to obtain the asphalt-based porous carbon. According to the invention, refined pitch is directly used as a carbon source raw material, pre-oxidation is carried out to obtain a partial oxygen-containing hard carbon structure, low-temperature pre-carbonization is carried out to obtain a carbonized precursor with very few volatile components, porous carbon is subjected to moderate graphitization through carbonization, the conductivity of a skeleton is improved, the skeleton is further subjected to pore forming through activation, and the high-performance porous carbon material is obtained.

The invention discloses a high-aluminum wear-resistant ceramic grinding ball and a preparation method thereof. The grinding ball comprises the following raw materials in percentage by weight: 85%-95% of aluminum oxide, 2%-10% of silicon dioxide, 1%-3% of calcium carbonate, 0.2%-0.5% of magnesium carbonate, 0.03%-0.05% of titanium dioxide, 0.01%-0.03% of sodium oxide and 1%-5% of modified zirconium dioxide. The preparation method of the modified zirconium dioxide comprises the following steps: adding hydrogen peroxide into a mixed solution of soluble cerium salt and soluble zirconium salt to obtain a reaction system; adding the reaction system into an alkaline solution for reaction, and collecting an insoluble substance after the reaction is finished; and calcining the insoluble substance to obtain the modified zirconium dioxide. The ceramic ball is simple in formula, rich in raw materials, low in price and low in production cost, the operation stability of the ceramic ball is improved, and the service life is prolonged.

This application relates to the field of metal surface treatment materials, specifically disclosing a silicon-integrated inorganic supercrystalline thermal energy powder and its preparation and application methods. The silicon-integrated inorganic supercrystalline thermal energy powder comprises raw material A and raw material B. Raw material A includes the following: magnesium oxide, sodium fluoroaluminate, sodium polyphosphate, zinc oxide, crystalline tin tetrachloride, silicon dioxide, and boric acid. Raw material B includes the following raw materials in parts by weight: spodumene, lithium carbonate, titanium dioxide, zinc silicate, sodium carbonate, antimony trioxide, albite, fluorite, boric acid, sodium hydroxide, and yttrium oxide. The inorganic supercrystalline thermal energy powder of this application has advantages such as corrosion resistance and oxidation resistance, good thermal stability, no damage from thermal cycling, high hardness, wear resistance and high temperature resistance, energy saving, water scale reduction, and the ability to replace organosilicon high-temperature resistant special coatings, baking paints, enamel paints, and ceramic floor glazes.

The invention provides a water-resistant building gypsum-based material and a preparation method thereof. The material comprises a building gypsum base body, a hydrophobic film is cured on the surface of the building gypsum base body, and the hydrophobic film is formed by curing waterproof liquid; the building gypsum base body is prepared from four components including desulfurized building gypsum, blast furnace slag, calcium oxide and water, the water-binder ratio is 0.5-0.6, the mass ratio of the blast furnace slag to the desulfurized building gypsum is (1-5): (5-9), and the mass of the calcium oxide is 2%-10% of that of the blast furnace slag; the waterproof liquid comprises water, sodium methyl silicate, tetraethoxysilane, dimethyl silicone oil, sodium hydroxide and sodium silicate. According to the preparation method, a proper waterproof treatment mode is selected according to the size of a workpiece. The blast furnace slag and the calcium oxide are introduced into the desulfurized building gypsum formula, the calcium oxide can effectively excite the activity of the blast furnace slag in a building gypsum matrix, so that the water resistance of a building gypsum-based material is improved, the water resistance of the material is further improved by the waterproof liquid, and meanwhile, the material is endowed with hydrophobicity.

The invention provides a synthesis method and application of a sulfuration modified palladium-iron bimetallic material. The method comprises the steps that potassium borohydride and sodium sulfide nonahydrate are dissolved in a solvent, sodium hydroxide is added into a sulfuration solution, the pH of the sulfuration solution is adjusted to be alkaline, and an alkaline solution is obtained. The method comprises the following steps: dropwise adding an alkaline solution into a mixed aqueous solution of FeSO4. 7H2O and sodium tetrachloropalladate at a speed of 10mL / min in a nitrogen atmosphere; and separating the precipitate from the mixed aqueous solution in a magnetic separation manner, and washing the precipitate for three times by using oxygen-free water and absolute ethyl alcohol to obtain the palladium iron sulfide bimetallic particles. Through a one-step reduction method of vulcanization and palladium doping, vulcanization modification and bimetal modification are combined to act on zero-valent iron, the stability of the zero-valent iron is enhanced through vulcanization, meanwhile, the reactivity of the zero-valent iron is improved through addition of bimetal, especially the selectivity to pollutants such as chlorinated paraffin and the reactivity after surface passivation are improved, and the stability of the zero-valent iron is improved. And the reliability and efficiency of the zero-valent iron in organic pollution remediation are greatly improved.

The preparation method of the low-sodium-oxide Bayer-process micro-powder aluminum hydroxide comprises the following steps: adding a seed crystal into a Bayer-process sodium aluminate solution to carry out a first-stage decomposition reaction so as to induce the generation and growth of an aluminum hydroxide crystal nucleus in the Bayer-process sodium aluminate solution; adding a sodium aluminate fine solution into the material subjected to the first-stage decomposition reaction for multiple times to perform a second-stage decomposition reaction so as to promote lattice reconstruction of the aluminum hydroxide crystal nucleus and removal of sodium ions in the sodium aluminate solution; carrying out solid-liquid separation on the material after the second-stage decomposition reaction to obtain a solid material; and washing and drying the solid material to obtain the micro-powder aluminum hydroxide. Through the synergistic effect of seed crystal induced crystallization, segmented decomposition reaction, temperature control, solid-liquid separation, washing and the like, the residual amount of sodium oxide is reduced from multiple links, and efficient preparation of the low-sodium-oxide micro-powder aluminum hydroxide is achieved.

The invention belongs to the technical field of glass materials, and particularly relates to black high-hardness heat-resistant microcrystalline glass ware and a preparation method thereof. Silicon dioxide, sodium oxide, aluminum oxide, potassium oxide, boric oxide, magnesium oxide, calcium oxide, zinc oxide, sodium fluosilicate, iron oxide, manganese oxide, fluorite, lithium oxide, metal manganese coated with silicon dioxide and schorlite are used as raw materials, and the black high-hardness heat-resistant microcrystalline glass ware is prepared through the processes of high-temperature melting and mixing, compression molding, annealing and tempering. The black high-hardness heat-resistant microcrystalline glass ware is excellent in performance, high in hardness and good in heat resistance, and has potential market value.

The invention provides a method for determining boron element in iron ore, which comprises the following steps: weighing 0.2 g of sample, uniformly mixing with a flux, heating to red at 700-800 DEG C, cooling, adding sodium peroxide for secondary melting, dissolving in water, and transferring to a beaker; adding ethanol to boil, fixing the volume to 500mL, filtering and taking 100mL, adjusting the pH value, adding hydrogen peroxide to slightly boil, cooling, adding barium carbonate to boil, diluting and filtering, and taking 25mL for color development determination. According to the method, sodium carbonate and / or potassium carbonate and sodium peroxide are adopted to form a composite flux, an iron ore sample is completely decomposed through secondary melting and step-by-step dissolution, and the sample decomposition efficiency is improved; the method is stable in recovery rate, is superior to a conventional method in precision, can accurately measure the boron content in the iron ore, meets the technical requirements on boron element detection in the fields of ferrous metallurgy, geological exploration and the like, provides an efficient and reliable detection means for boron content analysis, and ensures the accuracy and reproducibility of a detection result.

The invention provides a biomass hard carbon negative electrode material and a preparation method thereof, and relates to the technical field of negative electrode materials. The preparation method of the biomass hard carbon negative electrode material comprises the following steps: S1, pretreating a biomass raw material, and performing carbonization treatment to obtain a carbonized material; s2, crushing the carbonized material to obtain a precursor; s3, mixing the precursor with a carbon nanotube, and calcining to obtain a doped carbon material; and S4, adding sorbitan, polyoxyethylene ether, diisopropyl methyl phosphate and diisooctyl phosphate into the doped carbon material, uniformly mixing to obtain a mixture, adding sodium hydroxide into the mixture, and heating to obtain the composite material. The biomass hard carbon negative electrode material provided by the invention has high capacity and first effect when being applied to the sodium ion battery.

The invention relates to the technical field of wastewater treatment agents, and discloses a photovoltaic wastewater treatment agent and a preparation method thereof.The preparation method of the treatment agent comprises the following steps that aluminum salt and cerium salt are dispersed in deionized water, then a surfactant is added, and a precursor is obtained after even mixing; adding sodium hydroxide into the precursor to adjust the pH value to 7.5-8.5, aging, centrifuging, washing, drying and calcining to obtain modified aluminum oxide; ultrasonically dispersing the modified aluminum oxide in deionized water, sequentially adding ferric salt, zircon salt and lanthanum salt, uniformly mixing, performing hydrothermal reaction, and cooling, centrifuging, washing and drying a product to obtain the photovoltaic wastewater treatment agent. The wastewater treatment agent disclosed by the invention has excellent fluorine removal performance and can be used for purifying photovoltaic wastewater.

The invention relates to a temperature-sensitive plugging type water-based drilling fluid for oil and gas drilling as well as a preparation method and application thereof, and belongs to the technical field of deepwater shallow oil and gas reservoir drilling and production. The water-based drilling fluid comprises the following components: natural seawater, a filtrate reducer, polyamine, ethylene glycol, sodium hydroxide, potassium chloride, xanthan gum, an anti-balling lubricant, a hydrate double-effect inhibitor, a temperature-sensitive blocking agent and glass beads. The water-based drilling fluid provided by the invention is used for deep water shallow oil and gas reservoir drilling, and can maintain good rheological property and reduce filtration loss and plugging performance under seabed low-temperature and high-pressure conditions. And the temperature-sensitive plugging agent can effectively enhance the plugging capability of the drilling fluid, especially in a low-temperature deepwater environment, a stable plugging layer can be rapidly formed, and the phenomena of collapse and hole shrinkage of a well wall are remarkably reduced.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an intelligent dosing system and method for hardness and alkali removal wastewater. The monitoring unit is used for monitoring calcium hardness, magnesium hardness and alkalinity of inlet water and outlet water and monitoring the pH value in a reaction tank 1; the control system is in communication connection with the monitoring unit, receives the monitoring data, and is used for selecting a dosing mode according to the calcium hardness, magnesium hardness and alkalinity data of the inlet water, calculating the dosing amount and feeding back and adjusting the dosing and pH value according to the monitoring data of the outlet water; the chemical adding unit comprises a lime chemical adding device, a sodium hydroxide chemical adding device and a sodium carbonate chemical adding device which are respectively connected with the control system, and corresponding chemicals are added according to instructions of the control system; the treatment unit sequentially comprises a coagulation tank, a reaction tank 1, a reaction tank 2, a flocculation tank and a sedimentation tank. According to the invention, through automatic intelligent dosing, the purpose of removing alkalinity and hardness in water at the lowest cost is achieved.

The invention discloses a method for modifying a nano-cluster Y molecular sieve, which comprises the following steps of: (a) controlling the sodium oxide content of the nano-cluster Y molecular sieve to be 2.0-4.5% through ion exchange treatment; (b) adopting an ammonium fluosilicate solution to carry out shallow dealumination and silicon supplementation on the nano-cluster Y molecular sieve obtained in the step (a), wherein the shallow dealumination and silicon supplementation means that the silica-alumina ratio of the nano-cluster Y molecular sieve after dealumination and silicon supplementation is controlled to be increased by 50-200% compared with that of the nano-cluster Y molecular sieve before treatment, and preferably, the silica-alumina ratio of the nano-cluster Y molecular sieve after dealumination and silicon supplementation is increased by 80-150%; (c) carrying out hydrothermal dealumination treatment on the material obtained in the step (b); and (d) carrying out acid treatment on the material subjected to hydro-thermal treatment to obtain the modified nano-cluster Y molecular sieve. Compared with a nano-cluster Y molecular sieve before treatment, the modified Y molecular sieve prepared by adopting the modification method not only keeps the nano-cluster shape, but also greatly improves the mesoporous content and the hydrothermal stability.

The invention relates to the technical field of heat-conducting interface materials, in particular to a heat-conducting pad material, a heat-conducting pad and a preparation method and application thereof. The heat conduction pad material is prepared from the following raw materials in parts by weight: 2400 to 2880 parts of heat conduction powder, 100 to 600 parts of liquid silica gel, 5 to 30 parts of hydrogen-containing silicone oil, 1 to 3 parts of platinum catalyst, 0.01 to 1.00 parts of alkynol compound and 10 to 60 parts of composite coupling agent, the heat-conducting powder is provided with heat-conducting materials with at least two particle sizes; the sodium oxide impurity content of the heat-conducting powder is less than or equal to 200ppm, and the chloride ion content is less than or equal to 5ppm; the small molecule volatile matter content of the liquid silica gel is less than or equal to 50ppm; and the ratio of the amount of substance of the liquid silica gel to the hydrogen-containing silicone oil is less than or equal to 1: 1.5. The heat conduction pad material is based on a strategy of raw material selection, reaction control and curing optimization (assisted by a catalyst, an inhibitor and a coupling agent), and volatilization and diffusion of siloxane small molecules are effectively inhibited or reduced.

The invention provides nanoscale superfine copper powder and a preparation method thereof, and belongs to the technical field of metal powder, the preparation method comprises the following steps: dispersing copper salt and a complexing agent in deionized water to obtain a copper salt solution; dispersing a reducing agent and a dispersing agent in deionized water to obtain a reducing solution; dispersing sodium hydroxide in deionized water to obtain a sodium hydroxide solution; the method comprises the following steps: heating a copper salt solution, a reduction solution and a sodium hydroxide solution to 45-80 DEG C, adding the reduction solution into the copper salt solution under a stirring condition, then adding the sodium hydroxide solution to obtain a mixed solution, and reacting for 2-3 hours; and after the reaction is finished, a suspension containing copper powder is obtained, and after solid-liquid separation, washing and drying are conducted, the nanoscale superfine copper powder is obtained. The method is simple in technological process, does not need special equipment and is suitable for industrial production. And the prepared nano copper powder is good in dispersing performance, uniform in particle size distribution, high in purity and suitable for being applied to the field of microelectronic components.

The invention discloses a recovery process of waste PET (polyethylene glycol terephthalate), which comprises the following steps: dissolving waste PET by using a good solvent, dropwise adding into cold methanol, precipitating, filtering, separating, drying, and hydrolyzing the waste PET by using a low-concentration sodium hydroxide aqueous solution, so that the PET can be effectively hydrolyzed at a relatively low temperature (25-40 DEG C), the reaction conditions are mild, the reaction time is short, the yield is high, and the recovery process is suitable for industrial production. The yield of the product TPA is up to 99%, the product TPA is easy to separate, and the solvent can be recycled.

The invention belongs to the technical field of metal material plating, and particularly relates to a connector surface composite coating and a preparation process thereof, and the preparation process comprises the following steps: adding modified carbon black and sodium molybdate into deionized water, stirring to obtain a corrosion inhibition material, and mixing with modified zinc oxide to obtain a mixed filler; the preparation method comprises the following steps: adding dibutyltin dilaurate and toluene diisocynate into polypropylene glycol to obtain a core material; adding hexadecyl trimethyl ammonium bromide and the mixed filler into a 93-96 wt% ethanol solution, adding the core material for emulsification, adding an isophorone diisocyanate solution, and stirring to obtain a microcapsule; nickel sulfate hexahydrate, nickel chloride hexahydrate, sodium citrate, boric acid, a surface dispersant, a sodium hydroxide solution and microcapsules are added into deionized water to be mixed, and an electroplating solution is obtained; and putting the connector into the electroplating solution for electroplating to obtain the composite coating. The expansion of pitting corrosion can be inhibited, and the long-term use reliability and stability of the connector in a marine environment are improved.

The invention relates to a method for extracting an aluminum-gallium-lithium system from coal gangue. The method comprises the following steps: subjecting the coal gangue to a leaching reaction with an inorganic acid to obtain an acid leaching solution; passing the acid leaching solution through an ion exchange resin to obtain a refined solution, eluting the ion exchange resin with dilute hydrochloric acid to obtain an eluate; concentrating and crystallizing the refined solution to obtain inorganic acid aluminum salt crystals and a separation filtrate, and calcining the crystals; passing the eluate through a gallium extraction resin column, eluting the gallium extraction resin with dilute hydrochloric acid to obtain a second eluate; adding sodium hydroxide, then filtering, adding hydrochloric acid to the filtrate, then filtering to obtain gallium mud, adding sodium hydroxide solution to form a gallium solution, and electrolyzing the gallium solution; and spray-roasting the separation filtrate to obtain a lithium-containing precipitate, reacting water with the lithium-containing precipitate to obtain a lithium-enriched solution, adding phosphate to obtain a second lithium-enriched solution, and adding carbonate to react.

The invention discloses a preparation method of a polyaluminum chloride water purifying agent. Comprising the following steps: step 1, dissolving aluminum trichloride hexahydrate in deionized water, raising the temperature to 70-80 DEG C, slowly dropwise adding a sodium hydroxide solution, reacting for 1-2 hours, and then curing for 24 hours to obtain a polyaluminum chloride solution; and 2, adding the modified chitosan into glacial acetic acid, carrying out ultrasonic stirring for 30-40 min, raising the temperature to 70-80 DEG C, slowly adding a polyaluminum chloride solution, dropwise adding a sodium hydroxide solution, carrying out a reaction for 1-2 h, and after the reaction is completed, carrying out static curing for 24 h to obtain the polyaluminum chloride water purifying agent. The water purifying agent has the beneficial effects that the chitosan is modified and compounded with the polyaluminum chloride, so that the water purifying capability is effectively improved.

The invention relates to an MHP precipitation method based on a compound alkali precipitator, which comprises the following steps: adding a compound alkali solution into a laterite-nickel ore liquid after iron and aluminum are removed, and carrying out precipitation reaction to obtain cobalt nickel hydroxide slurry; the compound alkali in the compound alkali solution comprises a mixture of sodium carbonate and sodium hydroxide; and carrying out post-treatment separation on the cobalt nickel hydroxide slurry to obtain the MHP. According to the method, a sodium hydroxide and sodium carbonate compounded system is used as a precipitator, and the MHP is prepared under the cooperation of sodium carbonate and sodium hydroxide, so that the problem of local over-alkalinity caused by direct use of strong-alkalinity sodium hydroxide is solved, the content of manganese in the obtained MHP is reduced, the content of nickel and cobalt in the MHP is increased, and the cost of subsequent MHP refining for preparing crystals is conveniently reduced; meanwhile, the reaction rate is more controllable, and the obtained MHP is better in filterability and lower in water content.

The invention discloses a magnesium alloy micro-arc oxidation electrolyte which comprises sodium metaaluminate, sodium hydroxide, sodium fluoroaluminate, aluminum fluoride and glycerol. The content of sodium metaaluminate is 5-25 g / L, the content of sodium hydroxide is 1-3 g / L, the content of sodium fluoroaluminate is 0.3-0.7 g / L, the content of aluminum fluoride is 0.2-0.3 g / L, and the content of glycerol is 1 g / L. The magnesium alloy micro-arc oxidation electrolyte comprises potassium metaaluminate, potassium hydroxide, potassium fluoroaluminate, aluminum fluoride and glycerol, the content of potassium metaaluminate is 10-20 g / L, the content of potassium hydroxide is 3-5 g / L, the content of potassium fluoroaluminate is 0.5-0.7 g / L, the content of aluminum fluoride is 0.3-0.5 g / L, and the content of glycerol is 1 g / L. The invention further discloses the magnesium alloy hard ceramic membrane and a preparation method thereof. According to the preparation method of the magnesium alloy hard ceramic film, the components and the microstructure of the magnesium alloy micro-arc oxidation film layer are changed, and meanwhile the hardness and the corrosion resistance of the magnesium alloy micro-arc oxidation film layer are improved.

The invention provides a preparation method of a tin-doped iridium dioxide anode catalyst, and belongs to the field of hydrogen production through water electrolysis. The preparation method comprises the following steps: dissolving an iridium trichloride raw material and a tin source in water, adding sodium hydroxide to adjust the pH value of the solution, fully stirring, transferring the stirred solution to a reaction kettle, heating to 120-160 DEG C, introducing oxygen to carry out pressurized oxidation, carrying out centrifugal filtration and washing on an oxidation product obtained after the reaction by using a sulfuric acid solution, deionized water and ethanol in sequence, and drying to obtain the iridium trichloride tin oxide. And obtaining an anode catalyst product. The tin-doped iridium dioxide catalyst is prepared in an aqueous solution system, the process is simple, the product performance is stable, the process is clean and free of pollution, and compared with a commercial catalyst, the overpotential of the obtained doped catalyst is reduced by 30 mV or above under the current density of 10 mA / cm < 2 >.