572results about "Alkali metal silicates" patented technology

The invention relates to a comprehensive utilization method of fluosilicic acid containing hydrogen fluoride, which comprises the following steps: 1) reacting a stock solution containing fluosilicic acid with a potassium fluoride raw material, and carrying out solid-liquid separation to obtain potassium fluosilicate and a hydrofluoric acid solution; 2) reacting potassium fluosilicate with a sodium hydroxide raw material, and carrying out solid-liquid separation to obtain a mixture of a potassium fluoride solution, sodium fluoride and silicon dioxide; and returning the potassium fluoride solution to the step 1) to be recycled as a potassium fluoride raw material. According to the scheme, hydrofluoric acid is prepared from fluosilicic acid containing hydrogen fluoride, sodium fluoride and water glass products are produced at the same time, no other byproduct waste is produced, and the raw material utilization rate is high. And meanwhile, the method has the advantages of low raw material cost, low equipment cost and low energy consumption cost, can generate remarkable economic benefits, and is suitable for popularization and application.

Described is a method for extracting alkali from silicates under carbon neutral conditions. The method involves providing a reaction mixture containing an alkali-bearing aluminosilicate composition and an alkali base composition. The reaction mixture is treated with a combined activation and leaching process to form a concentrated alkali-silicate solution and an alkali aluminosilicate solid residue, where carbon dioxide is produced as a carbon dioxide reusable co-product from the activation. The alkali aluminosilicate solid residue is reacted with a first portion of the carbon dioxide reusable co-product to form an alkali leached aluminosilicate composition, thereby extracting alkali from the alkali-bearing aluminosilicate composition. Also described are methods of making inorganic polymer cement and concrete from the products and / or co-products produced by the method of extracting.

The invention relates to the field of negative electrode materials, and provides a negative electrode material and a preparation method thereof, and a battery, the negative electrode material comprises silicon-based active particles and lithium silicate; the negative electrode material further comprises doping elements, the doping elements comprise Mg, Al and P, the mass content of the Mg element in the negative electrode material is a%, the mass content of the Al element in the negative electrode material is b%, the mass content of the P element in the negative electrode material is c%, and in the negative electrode material, a, b and c meet the following relational expressions that (a + b) / c is larger than or equal to 0.3 and smaller than or equal to 1.5, and a + b + c is larger than or equal to 0.5 and smaller than or equal to 10. The elements Mg, Al and P are introduced into the negative electrode material provided by the invention, so that formation of a lithium ion transmission channel can be facilitated, and the rate capability of the negative electrode material is improved.

A method of producing an alkaline mixture comprising sodium silicate may comprise, comminuting an ore of iron or manganese into, the ore comprising siliceous mineral. The ore may be dehydrated followe

The invention belongs to the technical field of industrial solid waste resource utilization and high-temperature CO2 adsorption materials, and provides a lithium orthosilicate-based CO2 high-temperature adsorbent prepared on the basis of synergistic treatment and synergism of various industrial wastes, and a method and application of the lithium orthosilicate-based CO2 high-temperature adsorbent. The preparation method comprises the following steps: separating, washing and drying to obtain a SiO2-containing hybrid solid product, mixing the SiO2-containing hybrid solid product with lithium battery derived lithium hydroxide, anhydrous citric acid and deionized water, drying to obtain a lithium silicate precursor, and finally roasting to obtain the lithium orthosilicate-based CO2 high-temperature adsorbent. Under the condition that the temperature window is 650-720 DEG C, the adsorption capacity of the adsorbent for high-concentration carbon dioxide can reach 18% or above, and part of the temperature can reach 30% or above. Most of the raw materials are selected from industrial wastes, and the preparation method has the characteristics of low cost and suitability for continuous production of process steps, and has industrial production prospects.

The invention provides a method for recovering silicon and metals from a waste catalytic cracking / catalytic cracking catalyst. The method comprises the following steps: carrying out hydrochloric acid acid leaching treatment on the waste catalytic cracking / catalytic cracking catalyst by using hydrochloric acid with the HCl concentration of 1-3 mol / L at 60-120 DEG C, and carrying out solid-liquid separation to obtain a leaching solution and loose microspheres; the leaching liquid is used for metal recovery; and reacting the loose microspheres with a hydrofluoric acid solution with the mass concentration of HF being 5-47%, introducing the generated gas into a sodium hydroxide solution with the mass concentration of sodium hydroxide being 5-40%, and removing a solid phase from the obtained product to obtain liquid sodium silicate. According to the method provided by the invention, high-efficiency and high-purity silicon recovery is realized through the cooperation of specific hydrochloric acid, hydrofluoric acid and sodium hydroxide treatment; and meanwhile, Ni, V, rare earth and Al components can be completely or almost completely leached into a leaching solution through specific hydrochloric acid treatment, and a foundation is laid for efficient recovery of the Ni, V, rare earth and Al components.

The present application provides a silicon-based negative electrode active material, the silicon-based negative electrode active material comprising a silicate phase containing an alkaline earth metal element, and the silicon-based negative electrode active material simultaneously containing the K element and the Fe element.

A curable composition includes at least one polyamine; an epoxy resin; and a silane-modified biosilica material. The silane-modified biosilica material is derived from rice husk and is present in the curable composition at a concentration of 0.01 to 10 wt. %, based on the total weight of the curable composition. The silane-modified biosilica material has an average particle size of 1 to 10 micrometers (μm). A method of making a cured composite material from the curable composition.

A method of producing a mesoporous chitosan / sodium iron silicate (NaFeSi2O6) nanocomposite includes hydrothermally treating a mixture of sodium metasilicate pentahydrate (Na2SiO3·5H2O) with iron(III) chloride hexahydrate (FeCl3·6H2O) to obtain NaFeSi2O6 nanoparticles. The method further includes combining the NaFeSi2O6 nanoparticles with a solution of chitosan to generate a precursor mixture; treating the precursor mixture with sodium hydroxide (NaOH), resulting in a nanocomposite where chitosan coats and aggregates the NaFeSi2O6 nanoparticles into rod-like structures. The resulting nanocomposite exhibits unique textural properties with mesopores larger than 15 nm, is ideal for adsorption, separation, and catalysis, and can be produced under mild conditions without complex procedures or hazardous chemicals.

The invention belongs to the technical field of building material exciting agents, and particularly relates to a sodium silicate powder exciting agent produced through a melting method. The sodium silicate powder exciting agent is prepared by taking waste incineration fly ash, glass powder and sodium hydroxide as reactants through heat treatment. The powdery exciting agent is prepared instead of a traditional solution form, the possibility of a single-component alkali activation binder system is achieved, the waste incineration fly ash is selected as one of the raw materials, the production cost of the exciting agent is greatly reduced, and therefore the cost of alkali activation concrete is reduced; according to the present invention, the utilization rate of the waste incineration fly ash in the building field can be improved, the cement consumption and the energy consumption are reduced, the problems of environmental pollution and land occupation caused by solid waste stockpiling are improved, the dual-carbon emission reduction is promoted, and the prepared alkali activation binder mortar has excellent compressive strength.

The invention discloses a spodumene concentrate resourceful treatment method which comprises the following steps: carrying out wet treatment on spodumene acid clinker to prepare lithium-removed filter residues and leachate; carrying out neutralization treatment and desulfurization treatment on the leachate to obtain a lithium-containing purified solution, gypsum and iron oxide red, and carrying out lithium extraction treatment on the lithium-containing purified solution to obtain a lithium salt and mirabilite; the lithium-removed filter residues are treated through a process combining a beneficiation method and a chemical method, and water glass, nano kaolinite, ceramsite aggregate and tantalum-niobium concentrate are obtained. According to the method, whole-process slag-free production of the spodumene concentrate is achieved, and meanwhile the lithium-containing compound with the high purity and the high quality is obtained; and various valuable products can be obtained.

The invention discloses a method for preparing high-modulus sodium silicate and co-producing white carbon black from rice hull ash. The method comprises the following steps: crushing the rice hull ash, and acidizing to obtain purified rice hull ash powder; reacting the purified rice hull ash powder with 5wt%-15wt% of caustic soda generated by bipolar membrane electrolysis to prepare a sodium silicate solution; carrying out neutralization reaction on the sodium silicate solution and 1-15 wt% of sulfuric acid solution under the assistance of ultrasonic waves, and filtering to obtain silicon dioxide silica gel and filtrate; washing and drying the silicon dioxide silica gel to obtain a white carbon black product; and carrying out electrolytic treatment on the filtrate through a bipolar membrane electrodialysis system, and respectively recycling the recovered alkali liquor and acid liquor. According to the method, resource utilization of the rice hull ash and cyclic regeneration of the reaction medium are realized, and a green production process is formed.

Provided is a silicon-based negative electrode active material, including M2Si2O5 and M2SiO3, where M includes one or more alkali metal elements; in an XRD pattern of the silicon-based negative electrode active material, a diffraction angle 2θ has a first diffraction peak ranging from 24° to 25°, and a half-peak width of the first diffraction peak is βA; the diffraction angle 2θ has a second diffraction peak ranging from 26° to 27°, and a half-peak width of the second diffraction peak is βB; and the silicon-based negative electrode active material satisfies 1.0≤βA / βB≤2.5.

The invention belongs to the technical field of carbon-coated lithium ferrous silicate, and discloses a preparation method and application of carbon-coated lithium ferrous silicate, the preparation method of carbon-coated lithium ferrous silicate comprises the following steps: S1, adding a surfactant into a silicon source to obtain a solution A; s2, sequentially adding an iron source and a lithium source into the solution A, and uniformly mixing to obtain a carbon-coated lithium ferrous silicate precursor; s3, carrying out high-temperature sintering on the carbon-coated lithium ferrous silicate precursor to obtain carbon-coated lithium ferrous silicate; the surfactant in the step S1 is a block type polyurethane surfactant, and a hydrophilic part structure in the block type polyurethane surfactant comprises polyethylene glycol PEG and 2, 2-dimethylolbutyric acid DMBA. According to the preparation method of the carbon-coated lithium ferrous silicate, the block type polyurethane surfactant is adopted in the step S1 and is not only used as a surfactant, but also used as a reducing agent and a carbon source, and a carbon coating layer of the prepared carbon-coated lithium ferrous silicate is uniform in thickness and excellent in electrochemical performance.

The invention relates to a comprehensive utilization major cycle process in cooperative treatment of industrial flue gas pollutants, which comprises the following steps: removing SO2 and NOx in flue gas by adopting an adsorption method, and desorbing SO2 and NOx by adopting a water solution method to generate sulfuric acid and nitric acid; sulfuric acid reacts with sodium chloride to produce hydrochloric acid; sulfuric acid, nitric acid and hydrochloric acid are combined into a composite acid solvent, the solvent dissolves aluminum oxide in the fly ash to be converted into polybasic acid aluminum, the polybasic acid aluminum is subjected to ammonification decomposition into aluminum hydroxide and composite acid ammonium, the composite acid ammonium reacts with calcium carbonate to generate NH3, CO2 and polybasic acid calcium, and the polybasic acid calcium reacts with sodium sulfate to generate nano calcium sulfate; the method comprises the following steps: reacting silicon dioxide with sodium hydroxide to generate sodium silicate, reacting sodium silicate with sodium bicarbonate to generate silicic acid and sodium carbonate, reacting sodium carbonate with calcium hydroxide to generate calcium carbonate and sodium hydroxide, and mixing multi-element metal oxide separated from aluminum and silicon extraction with silicon dioxide and aluminum hydroxide which are separated and carried to prepare a multi-element cation molecular sieve; and comprehensive utilization and large circulation of the flue gas pollutants are realized through the synergistic effect of the pollutants.

The invention relates to the technical field of sodium silicate production, and particularly discloses a method for preparing sodium silicate by dissolving fluorine-containing silicon dioxide with alkali lye, which comprises the following steps: step 1, adding fluorine-containing silicon dioxide, sodium carbonate and water into a reaction kettle with a stirrer and a heating device to obtain a mixed material; 2, fully and uniformly stirring the mixed material obtained in the step 1, heating the mixed material by using a reaction kettle, and controlling the reaction temperature and the reaction time for reaction; and 3, filtering and separating the reaction product obtained in the step 2 to obtain a sodium fluoride filter cake and a sodium silicate solution. Sodium carbonate and sodium bicarbonate are used for dissolving silicon dioxide in a liquid phase reaction to prepare sodium silicate, the process is green and environment-friendly, sodium carbonate in chemical production can be effectively utilized, energy is saved, consumption is reduced, and the environment is protected. The technical problems that in the prior art, the temperature is high in the reaction process, a large amount of heat needs to be consumed, and energy consumption is high are solved.

The invention relates to the technical field of mineral separation, in particular to a zirconium metallurgy waste alkali liquor recycling treatment method. The method comprises the following steps: chemically analyzing the contents of OH <->, Na2O and SiO2 in the zirconium metallurgy waste alkali liquid; calculating the addition amount of the white carbon black according to the reaction equations (4) and (5) of the main components in the zirconium metallurgy waste alkali liquid and the white carbon black and the modulus of the water glass to be prepared; 2 NaOH + m SiO2 > Na2O.m SiO2 + H2O (4); (5) Na2SiO3 + mSiO2-> Na2O. (m + 1) SiO2; the method comprises the following steps: adding white carbon black into zirconium metallurgy waste alkali liquor under closed and stirring conditions, and reacting to obtain water glass; according to the method, the zirconium metallurgy waste alkali liquor is turned into wealth through the method of generating the water glass, and the purpose of recycling the zirconium metallurgy waste alkali liquor can be achieved.

The invention provides a charcoal-coated lithium ion doped sodium ferric silicate composite material as well as a preparation method and application thereof, and belongs to the technical field of sodium ion batteries. The sodium iron silicate is modified in a lithium ion doping manner, so that the specific discharge capacity of the sodium iron silicate can be effectively improved; the lithium ion doped sodium iron silicate material is subjected to carbon coating by adopting the charcoal, so that the cycle performance of the sodium iron silicate can be effectively improved; according to the invention, lithium ion doping and carbon coating methods are adopted at the same time, so that the electrode material has the characteristics of high conductivity, high specific capacity, excellent cycle stability and the like. Results show that the capacity of the charcoal-coated lithium ion-doped sodium ferric silicate composite material prepared by the invention is retained by 82% after 50 cycles at a voltage window of 1.5-4.5 V and a current density of 0.05 C, and the cycle performance is obviously improved.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a composite positive electrode material for a lithium ion battery and a preparation method of the composite positive electrode material. The composite positive electrode material is composed of a positive electrode base material, a lithium supplementing material and a catalytic material. The preparation method comprises the following steps: (1) preparing a composite material of the positive electrode base material and the lithium supplementing material in situ; and (2) dispersing the catalytic material on the surface of the composite material of the positive electrode base material and the lithium supplementing material, and forming a stable interface layer between the catalytic material and the lithium supplementing material. According to the method disclosed by the invention, the lithium supplementing material has double functions of surface modification of a positive electrode base material and lithium supplementing of a negative electrode, and meanwhile, the first effect and the cycling stability of the battery are improved; a catalytic material is introduced to the surface of the lithium supplementing material, free O generated by the lithium supplementing material Li is fixed in situ, the bag expansion phenomenon of the battery is relieved, and the cycling stability and safety of the battery are further improved; the preparation process is simple, raw materials are cheap and easy to obtain, the production cost is low, and industrial production and popularization are easy.

Provided are a prelithiation method of a silicon-based active material, the prelithiation method including step S1 of immersing the silicon-based active material in a prelithiation solution including an organic solvent and a lithium-hydrocarbon molecule complex, step S2 of obtaining a powder by washing the silicon-based active material with the organic solvent and drying the silicon-based active material, and step S3 of performing a heat treatment on the powder at a temperature of 400° C. to 800° C. in an inert gas atmosphere, and a silicon-based active material prelithiated by the method.

The present invention relates to a simple and novel process to produce a beryllium containing lithium-based triphasic composite material for application as tritium breeder material in nuclear fusion reactors. The composite material comprises three different lithium-based breeder materials, out of which one phase contains beryllium in its structure that may serve as a neutron multiplier. The process does not yield any liquid or solid waste during production of the composite material and therefore is a safe and environment friendly process.

An anode material, a preparation method thereof, and a lithium ion battery provided. The anode material includes a core of a silicon-based material and a first coating layer coating on at least part of surface of the core of the silicon-based material, where first coating layer has an undulation y of 1≥y≥0.10, and the undulation y of the first coating layer is expressed by Formula (I):y=1-exp⁢ (-(Rmax-Rmin)D⁢50×C)(I)where, Rmax is a maximum thickness (nm) of the first coating layer, Rmin is a minimum thickness (nm) of the first coating layer, D50 is a median particle size (μm) of the anode material, and C is a mass ratio (%) of the first coating layer in the anode material. The anode material of the present disclosure has properties of excellent conductivity, cycling performance, and rate performance, and can suppress occurrence of irreversible expansion.

The present invention relates to a process and plant for reacting carbon dioxide with an alkali metal to form an alkali metal carbonate precipitant. The process and plant including a breaking step in which a slurry feed is broken down and forms an aqueous suspension, and a contacting step in which feed gas including carbon dioxide is contact with the suspension to form an alkali metal carbonate. The breaking and contacting steps are carried out progressively.

The invention provides a positive electrode active material, a preparation method thereof, a positive electrode plate containing the positive electrode active material, a full-tab battery cell and an electric device, and relates to the technical field of lithium ion batteries. The positive electrode active material is of a double-spherical particle structure with a glass-phase neck bridge at a contact neck part, each spherical particle comprises an active material body and a coating layer coating the active material body, and the active material body is lithium iron phosphate dispersed with Fe2P; the average thickness tsh of the coating shell layer is equal to 5 to 9 nm; the thickness tcheck of the glass phase neck bridge is 5-25nm, and the total content G of the glass phase in the positive electrode active material is 1.5-2.2 wt%; the volume average particle size of the positive electrode active material is 7-9 [mu] m. According to the positive electrode active material disclosed by the invention, through the cooperation of the coating shell layer, the embedded Fe2P nano second phase and the glass phase neck bridge, the comprehensive performance of a full-tab battery cell and an electric device can be effectively improved.

The invention discloses a solid sodium silicate preparation process based on segmented temperature control roasting, and relates to the technical field of inorganic chemical material preparation. The process comprises the steps of raw material proportioning, mixing homogenization, segmented temperature control roasting and post-treatment. By matching physicochemical reaction requirements in stages, the reaction is more stable and more thorough, the conversion rate is remarkably improved, and unreacted nuclei are basically eliminated. A quenching and slow cooling procedure is adopted, so that the product is ensured to have a high-whiteness and high-transparency glass body state, the internal stress is small, the mechanical strength is high, and the appearance quality and the physical property are remarkably improved; and by adjusting the temperature and time parameters of each stage, the requirements of different raw material specifications and production of products with different moduli can be flexibly met. By accurately controlling the temperature, time and atmosphere of each stage, the problems of non-uniform reaction and poor product quality in the traditional process are solved, and the preparation of solid sodium silicate with high conversion rate, high whiteness and low internal stress is realized.

The invention provides a positive electrode material and a preparation method thereof, a battery monomer, a battery device and a power utilization device. The positive electrode material comprises a sodium transition metal oxide and a silicate material located on the surface of the sodium transition metal oxide, the positive electrode material has the following chemical formula: NaxMyNzO2 / (aNa2O.nSiO2-XrOt.SiO2) b, M comprises one or more of Fe, In, Co, Mn, Ni and Cr, N comprises one or more of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, W, Bi, Sr, Sn, Ga and Al, and X comprises one or more of Na, Li, K, Mg, Ca, Zn, Al, Cr, Sr, Sn and Sb; 0.58 < = x < = 1.05, 0 < y < = 1, 0 < = z < = 1, 0 < y + z < = 1, 1 / 3 < = r / t < = 2, 1 < = n / a, and 0 < b < = 0.2. The positive electrode material provided by the invention can improve the rate capability and the processability of the battery monomer.

The invention relates to a method for separating iron, vanadium and titanium dioxide in vanadium titano-magnetite or titanium concentrate through a wet method, and belongs to the technical field of chemical engineering. The method comprises the following steps: (a) mixing vanadium titano-magnetite or titanium concentrate with sulfuric acid with the concentration of 22-30wt.% to obtain mixed slurry; (b) treating the mixed slurry at 150-200 DEG C and 2-4 MPa under the condition that the Reynolds number is gt; reacting in a turbulent flow state of 4000, so that non-titanium elements are dissolved to generate sulfate; (c) carrying out solid-liquid separation on the reaction product in the step (b) to obtain a high-grade titanium-rich material and waste liquid; (d) the titanium-rich material reacts with a sodium hydroxide solution, silicon in the titanium-rich material is removed, and a sodium silicate solution is generated; and (e) reacting the silicon-removed titanium-rich material with a hydrochloric acid solution with the mass concentration of less than 15%, cleaning, carrying out solid-liquid separation, and calcining to obtain anatase or rutile titanium dioxide. According to the method, all iron, vanadium and titanium elements in the vanadium-titanium-iron concentrate and the titanium concentrate are recycled.

The invention relates to a method and a device for recycling waste from silicon elements, particularly crystalline silicon, wherein waste without metallic adhering is introduced into a reactor (R) with alkali hydroxide solution or water and is circulated, and wherein hydrogen and alkali silicate solution are simultaneously produced by direct reaction of the silicon with the alkali hydroxide solution, and hydrogen and silica are simultaneously produced with water, and the hydrogen and alkali silicate solution are discharged from the reactor (R) after the required reaction time, or wherein waste containing metals is introduced into a reactor (R) with alkali hydroxide solution and is circulated.and that by direct reaction of the silicon, hydrogen and alkaline water glass solution containing metals are simultaneously produced and, after the required reaction time, are drained from the reactor (R) and the alkaline water glass solution is filtered in a filter and the metals are deposited in the filter, generating heat at the same time.

The invention relates to the technical field of preparation of novel bio-based materials, in particular to a preparation method for producing a rice hull-based high-purity high-modulus sodium silicate solution by taking rice hulls as raw materials. Rural solid waste rice hulls / grass are used as raw materials, combustion is carried out at the fixed low temperature of 700-750 DEG C, generated steam is used for supplying heat to the production or the park, and the combusted rice hull ash contains amorphous silicon dioxide gt; 90%; the method comprises the following steps: activating rice hull ash just out of a chamber and diluted hydrochloric acid (5-10%) to generate polyhydroxy surface modified silicon dioxide active seeds; the method comprises the following steps: dynamically mixing rice hull ash and a 25% NaOH solution according to a molar ratio of (3.25-4): 2, adding 3-7% of active seeds in batches at 105 + / -5 DEG C, and reacting for more than or equal to 3 hours; the high-purity sodium silicate solution with the modulus of 3.25-4.0 is finally obtained through pH segmented regulation (Mg < 2 + > is removed at the pH of gt and 12, and Ca < 2 + > is removed at the pH of 9.5-10) in combination with high-pressure refined filtration; the product is mainly used for preparing nano silicon dioxide, especially for preparing 5nm silicon dioxide dispersion liquid and high-purity electronic grade silicon dioxide as raw materials.

The invention relates to the technical field of tailing preparation, and provides a device and method for preparing magnesium chloride from serpentine tailings, the device for preparing magnesium chloride from serpentine tailings comprises a fixed support, the top of the fixed support is fixedly connected with a semi-cylindrical support, and a magnetic separation barrel is rotationally arranged in the semi-cylindrical support through a rotating seat; the device further comprises a circulation frame, the circulation frame is fixedly connected to one side of the top of the semi-cylindrical support, two treatment cavities are formed in the circulation frame, a mineral powder input assembly and a residue output assembly are arranged in the two treatment cavities correspondingly, and a powder liquid discharging assembly is arranged on the other side of the top of the semi-cylindrical support. And the powder liquid discharge assembly is communicated with the mineral powder input assembly. According to the technical scheme, the problem that in the magnetic separation process of the serpentine tailing powder in the prior art, it is difficult to sample, test and detect part of the serpentine tailings in the magnetic separation process of the serpentine tailings continuously is solved.