31 results about "Alkali carbonate" patented technology

The invention provides a method for detecting and analyzing heavy metal chromium in high-aluminum ore and red mud, and belongs to the field of mineral analysis and detection. The method comprises the following steps: melting a mixture of a sample to be detected and a strong alkaline flux to obtain a melt; extracting and dissolving the melt by using a dilute acid solution to obtain a leaching solution; a strong oxidant and a catalyst are added into the leachate, so that chromium ions in the leachate are oxidized into hexavalent chromium ions, and hexavalent chromium conversion liquid is obtained; adding an alkali carbonate solution into the hexavalent chromium conversion solution to adjust the pH value of the hexavalent chromium conversion solution to 8-10 to obtain a mixed solution; filtering the mixed solution to obtain a chromium-containing filtrate; and quantifying the total chromium content in the chromium-containing filtrate by adopting a spectrophotometric method. The detection and analysis method provided by the invention can ensure that chromium existing in lattices of the high-aluminum ore and red mud sample is completely released, and main matrix interference elements such as aluminum, iron, calcium and magnesium in the sample can be effectively separated, so that accurate determination of the total chromium content in the to-be-detected sample is realized.

The application discloses a basic lanthanum carbonate particle and a preparation method thereof. The basic lanthanum carbonate particle has an ellipsoidal appearance, a particle size of 1-4.5 microns, and a particle size distribution alpha satisfying the condition of 1.1<=alpha<=1.5. The preparation method can produce the basic lanthanum carbonate particle on a large scale under mild conditions.

The invention belongs to the technical field of waste resource utilization, and provides a separation method for valuable metals in an acid leaching solution. After the pH value of the acid leaching solution is adjusted to be alkaline, the obtained alkaline solution is mixed with gas containing carbon dioxide in a spraying or aeration mode for reaction. According to the method, magnesium ions and aluminum ions in the acid leaching solution are converted into basic carbonate and calcium ions are converted into carbonate by utilizing carbon dioxide and liquid caustic soda; compared with hydroxide, basic carbonate and carbonate cannot adsorb lithium ions and rare earth ions in an acid leaching solution, ferric hydroxide formed by a small amount of iron ions has limited adsorption on the lithium ions, and efficient separation and recovery of the lithium ions can be achieved. Furthermore, the carbon dioxide-containing gas is carbon dioxide-containing tail gas, and the separation method can utilize the carbon dioxide gas in the tail gas, so that the carbon emission is reduced.

The present invention relates to a polystyrene polymer formulation comprising a polystyrene comprising polymer material and from > 3 to 15 wt.-%, based on the total weight of the formulation, of at least one nucleating agent selected from the group consisting of a particulate earth alkali carbonate- comprising material, a particulate earth alkali phosphate-comprising material, a particulate hydroxide- comprising material and mixtures thereof, a polystyrene foam, a process for preparing the polystyrene polymer formulation and a process for preparing the polystyrene foam, an article comprising the polystyrene foam as well as the use of a particulate earth alkali carbonate-comprising material, a particulate earth alkali phosphate-comprising material, a particulate hydroxide-comprising material and mixtures thereof as nucleating agent in a polystyrene polymer formulation.

The present disclosure provides a method of increasing the rate of phase conversion and use of a carboxylate-containing substance. A method of increasing the rate of phase conversion in the course of preparing a rare earth hydroxycarbonate from a rare earth carbonate comprises: mixing a rare earth carbonate with an aqueous solution of a carboxylate-containing substance to obtain a slurry; and heating the slurry such that reactions proceed. The method of the present disclosure can improve the rate of conversion from a rare earth carbonate to a rare earth hydroxycarbonate.

The invention provides a supported alkali metal catalyst as well as a preparation method and application thereof. The supported alkali metal catalyst comprises a carrier and an active component, the carrier has a porous structure, and the carrier is a hydrophilic carrier; the active component comprises alkali carbonate, and the alkali carbonate is loaded in the porous structure of the carrier. According to the supported alkali metal catalyst disclosed by the invention, the active component alkali metal carbonate is supported in the pore channels of the hydrophilic carrier, so that the alkali metal carbonate is not easy to peel off from the carrier in a catalytic reaction process, and good catalytic activity and stability can be realized.

The application relates to a polypropylene material with high impact resistance and low melting point, a preparation method and application thereof. The polypropylene material with high impact resistance and low melting point comprises the following components in percentage by weight: 99.70-99.99% of polypropylene resin; 0.005-0.15% of nucleating agent A; and 0.005-0.16% of nucleating agent B. The nucleating agent A is a cyclohexane dicarboxylic acid metal salt; and the nucleating agent B is an alkali carbonate. The specific nucleating agent A and the nucleating agent B are compounded, the influence of the melt index fluctuation is overcome, the toughness difference between batch products is reduced, the product performance is stabilized, the polypropylene pipe material with high impact resistance, low melting point and stable quality is provided, the production cost is low, the preparation method is simple, and the large-scale application is facilitated.

The invention provides a catalyst for electrooxidation of chlorine-containing electrolyte and a preparation method and application thereof, the catalyst comprises a layered double hydroxide-rare earth basic carbonate heterojunction grown on a nickel substrate in situ, and the nickel substrate is foamed nickel with the surface modified by nickel. On the basis of a strategy for constructing selective adsorption sites capable of distinguishing Cl <-> and OH <->, preferential adsorption of OH <-> is realized by introducing rare earth basic carbonate (RE (OH) CO3), so that the chloride ion corrosion resistance of the material in seawater electrolysis is remarkably enhanced. The heterostructure not only has oxygen evolution reaction activity superior to that of traditional LDH, but also shows excellent structural stability and continuous corrosion resistance under the industrial-grade current density, and a feasible material solution is provided for promoting industrial application of a seawater electrolysis technology.

The present invention relates to a method for preparing alkali carbonate / bicarbonate salts, comprising the steps of continuously feeding an aqueous alkali hydroxide solution to a gas-liquid contactor, forcing an inlet CO2-containing gas stream through a sparging device immersed in the gas-liquid contactor below the surface level of the aqueous alkali hydroxide solution to generate bubbles and / or microbubbles, adding hydrogen peroxide near the orifice of the sparging device where the bubbles and / or microbubbles are generated, the hydrogen peroxide supply being adjusted to reduce the formation of alkali carbonates and increase the formation of alkali bicarbonates, and continuously discharging an effluent from the gas-liquid contactor from which the alkali carbonates and bicarbonates, predominantly bicarbonate components, are recovered. A gas-liquid contactor and an apparatus are also provided by the present invention.

Compositions and Processes for Treating Keratinous Substrates: The disclosure relates to compositions and processes for treating keratinous substrates, such as skin and / or hair, where the compositions comprise (a) at least one alkali carbonate, (b) at least one polyol, (c) water and / or at least one non-aqueous solvent, and (d) optionally at least one pH adjuster. The at least one carbonate and the at least one polyol are present in the composition as an associated network. Figure for the abstract: none

The invention discloses a low-grade regenerated micro-powder-based low-carbon Portland cement-based material which comprises the following components in parts by weight: 50-70 parts of low-carbon cement clinker, 30-50 parts of an active regenerated micro-powder admixture and 0.5-5 parts of a carbon curing accelerator. The carbon curing accelerator comprises a carbonate type layered double-metal hydroxide matrix and a basic carbonate phase growing on the surface of the matrix in situ, and metal elements in the basic carbonate phase and metal elements in the layered double-metal hydroxide are homologous. According to the invention, the low-carbon cement clinker prepared from the low-grade regenerated micro powder is used for replacing the traditional low-carbon cement clinker, so that the carbon emission is reduced while the resource utilization of wastes is realized. Meanwhile, the gelling activity of the regenerated micro-powder is improved by means of chemical and thermal activation and the like, so that the utilization of the regenerated micro-powder in a cement-based material is further promoted.

The invention discloses a high-purity anhydrous composite rare earth halide and a preparation method thereof, a scintillation crystal, scintillation ceramic and a scintillation thin film material, the general formula of the composite rare earth halide is AxREyXx + 3y, A is an alkali metal element, RE is a rare earth element, X is a halogen element, and y is a rare earth element. The preparation method comprises the following steps: uniformly mixing alkali carbonate or hydroxide, rare earth metal oxide or carbonate or hydroxide and a first part of ammonium halide according to a first preset proportion to obtain a first mixture; carrying out primary heating halogenation reaction on the first mixture in an inert atmosphere to obtain a composite rare earth halide primary material; uniformly mixing the composite rare earth halide primary material with a second part of ammonium halide according to a second preset proportion to obtain a second mixture; and carrying out secondary heating halogenation reaction on the second mixture in an inert atmosphere to obtain the high-purity anhydrous rare earth composite halide. The deep purification of the composite rare earth halide is realized through a two-step halogenation process, and residual trace water and oxygen impurities are thoroughly removed.

The invention discloses glass powder and glass slurry for a thermal printing head substrate and a preparation method of the glass powder and the glass slurry. The glass powder comprises the following raw materials in percentage by weight: 37-47% of silicon oxide, 3-13% of boric acid, 2-6% of aluminum oxide, 1-5% of zirconium oxide, 37-47% of alkaline earth metal carbonate, 0-3% of alkali metal carbonate and 0.3-4.5% of a surface active component. The glass expansion coefficient and the glass sintering temperature are adjusted by introducing alkaline earth metal carbonate into the glass powder; by introducing alkali carbonate, the glass expansion coefficient is improved, the glass surface tension is improved, the glass firing temperature is reduced, and the problem that the glass slurry is thickened and fat at aluminum oxide corners is solved; by introducing the surface active component, the surface tension of the glass is reduced, the viscosity of the glass is improved, a glass firing window is expanded, and the unevenness of the glass slurry after being sintered on the surface of an aluminum oxide substrate is improved. By introducing zirconium oxide, the heat resistance and chemical resistance of the glass are improved.

The invention provides a self-supporting negative electrode, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: carrying out first reaction on carbon cloth, a cobalt source, a nickel source and urea to obtain a first product; performing second reaction on the first product and an iron source to obtain a second product; performing third reaction on the second product and a carbon source to obtain a third product; the third product comprises carbon cloth and an iron-containing compound loaded on the carbon cloth; and reacting the third product with a selenium source to obtain the self-supporting negative electrode plate. According to the invention, a cobalt source and a nickel source form a basic carbonate nanowire array, the basic carbonate nanowire array is used as a template agent to form a FeOOH nanowire array on the surface of the carbon cloth, and then the carbon cloth / FeSe2 (at) C composite material with a stable structure is prepared by coating a carbon layer and introducing a selenium element.

The application relates to a mixed reinforcing agent characterized by comprising a mixture of alkali carbonate and one or more of zirconium oxide, zirconite powder, white corundum and silicon oxide, and the solute particle size of the mixture is 10 nm-50 mu m. The application also relates to a binder jet 3D printing method. The scheme can solve the problem of low strength of the binder jet 3D printing ceramic product in the prior art.

The application provides a resourceful treatment method of heavy metal wastewater, and belongs to the technical field of wastewater treatment. The application selects cheap and easily obtained biomass as raw material for capturing heavy metal ions, so that the biomass is better utilized, the pollution to the environment is reduced to a certain extent, and the biochar prepared from the biomass plays a role in promoting precipitation and adsorbing precipitation in the hydrothermal capture of heavy metal ions due to the special physicochemical properties of the biochar, so that the precipitation rate and removal rate of the heavy metal ions in the wastewater are more than 99%, and the wastewater can be discharged or reused up to the standard. In the process of the hydrothermal reaction of the heavy metal wastewater, the alkali carbonate precipitation reaction is carried out, the heavy metal ions in the original wastewater generate alkali carbonate precipitates and are collected on the biochar, and the alkali carbonate-biochar compound can be easily separated from water. The obtained alkali carbonate-biochar compound can be subjected to simple electrolysis or thermal treatment, so that the heavy metal is recycled and used with high added value. The process is clean and efficient, the method is novel, and the practicality is strong.

A black IR reflective or transmissive pigment from which LiDAR responsive black coatings can be formed where the pigment displays a Blackness My value similar to non-IR reflective carbon black. The CuO particles display small crystallites of less than 18 nm and an (−111) / (111) reflectance intensity ratio of less than 1.2. A method of forming the CuO particles includes precipitation of CuCO3 or CuCO3 / Cu(OH)2 using an alkali carbonate as a precipitant and calcining the precipitate at about 300° C. to about 400° C.

The invention relates to a carbonate intercalated core-shell structured electrolytic seawater catalyst as well as a preparation method and application thereof. A preparation method of a carbonate intercalation core-shell structure electrolytic seawater catalyst comprises the following steps: (1) immersing pretreated foamed nickel into an aqueous solution containing cobalt salt, urea and ammonium fluoride, and growing a basic cobalt carbonate nanowire array containing a carbonate intercalation on the surface of the foamed nickel through a hydrothermal reaction; and (2) by taking the basic cobalt carbonate nanowire array as a working electrode, coating the surface of the basic cobalt carbonate nanowire with an iron oxyhydroxide layer through electrochemical deposition in a ferrite solution to obtain the seawater electrolysis catalyst. According to the carbonate intercalated core-shell structured electrolytic seawater catalyst and the preparation method and application thereof, the prepared electrolytic seawater catalyst is of a core-shell heterostructure, and the iron oxyhydroxide shell effectively inhibits release of carbonate, so that the catalyst keeps long-term chlorine corrosion resistance.

A process for producing sulphuric acid and a base from an inorganic sulphate salt is disclosed. This process involves reacting the inorganic sulphate salt with carbon dioxide and ammonia in water, forming ammonium sulphate and a hydrogen 5 carbonate, carbonate, or basic carbonate salt. The ammonium sulphate is then converted into sodium hydrogen sulphate (sodium bisulphate) through a reaction with sodium sulphate, and the ammonia gas is recycled. Sulphuric acid is recovered from the sodium hydrogen sulphate by crystallising sodium sulphate decahydrate (Glauber's salt) at a low temperature, which leaves the sulphuric acid in solution. This Glauber's salt can be reused in the process. Alternatively, the sulphuric acid can be recovered from a concentrated sodium hydrogen sulphate solution through solvent extraction. The solvent used comprises a mixture of tris(2-ethylhexyl)amine (TEHA) and 1-octanol. The metal hydrogen carbonate, carbonate, or basic carbonate salt can be further processed into a basic metal oxide or a metal hydroxide. In a condensed 15 form, the disclosed process can be used to recover sulphuric acid and ammonia from ammonium sulphate. This process enables the conversion of the sodium sulphate, which is formed during the synthesis of precursor cathode active materials (pCAM) for lithium-ion batteries, into sulphuric acid and sodium hydroxide.

The invention provides a core-shell structure basic carbonate precursor as well as a preparation method and application thereof. The core-shell structure basic carbonate precursor comprises an inner core and an outer shell, the inner core is formed by relatively loosely stacking flaky primary particles, and the main component is hydroxide, so that the volumetric specific energy of the carbonate material can be improved to a certain extent, and meanwhile, the rate capability of the material is considered; the shell is formed by relatively densely stacking dotted primary particles, the main component is carbonate, CO2 can be generated in the sintering process of the carbonate, so that the material is loose and porous, permeation of an electrolyte is facilitated, and material capacity exertion and rate capability improvement can be obviously promoted. The overall structure in the particle is loose and porous, so that the volume change of the material in the charge-discharge process can be effectively buffered, and the cycle performance of the material is improved. Therefore, the precursor can be used for preparing the positive electrode material with high rate performance, high cycle stability and volume specific capacity.

The invention discloses a strong brine mineralization carbon sequestration method, which comprises: introducing a carbon dioxide gas source into pure water, and stirring under a pressure until the carbon dioxide is dissolved in the pure water to obtain a carbonic acid solution; under the pressure, dropwise adding liquid alkali into the carbonic acid solution, and adjusting the pH value to obtain a high-pressure carbonic acid alkali solution; the method comprises the following steps: mixing a high-pressure alkali carbonate solution with strong brine containing calcium ions at normal pressure, and curing at 25-40 DEG C to obtain reaction slurry; and carrying out solid-liquid separation, washing, drying and collecting to obtain calcium carbonate. According to the method, the removal rate of calcium ions in the strong brine subjected to nanofiltration separation can reach 97%, the calcium hardness of effluent is remarkably reduced, favorable conditions are created for effluent reuse, about 0.4 ton of carbon dioxide is fixed for producing 1 ton of calcium carbonate products, high-value mineralization utilization of carbon dioxide in flue gas is realized, and the problems of calcium resource waste, high energy consumption, low energy consumption and the like in strong brine treatment are synchronously solved. And the utilization of carbon dioxide in the carbon capture field is limited.

This invention discloses a Co4S3 / Ni3S2@C-CNF catalytic material, its preparation method, and its application. The method includes: 1. Dissolving Ni(NO3)2·6H2O, Co(NO3)2·6H2O, and urea in a mixed solution of isopropanol and deionized water, stirring until homogeneous, and then transferring the solution to a hydrothermal reactor. Maintaining the temperature at 100–120°C for 12–16 h, followed by washing and drying, yields a basic carbonate; 2. Dissolving the basic carbonate and thioacetamide in anhydrous ethanol and stirring until homogeneous, transferring the solution to a hydrothermal reactor, maintaining the temperature at 120–130°C for 6–12 h, followed by washing and drying, yields NiCo2S4; 3. Weighing hydrochloric acid... 4. Mix dopamine and NiCo2S4, add Tris solution to the mixture, stir in the dark to form NiCo2S4@PDA solution, filter to obtain NiCo2S4@PDA composite material; 5. Disperse bacterial cellulose BC and NiCo2S4@PDA composite material in deionized water and stir evenly, dry to obtain NiCo2S4@PDA / BC composite material; 6. Place NiCo2S4@PDA / BC composite material in a tube furnace and carbonize at high temperature to obtain Co4S3 / Ni3S2@C-CNF composite material, which has good adsorption effect on sulfides and improves the electrochemical performance of Li-S battery.

The application belongs to the technical field of solid oxide electrochemical devices, and particularly relates to a low-temperature cerium-based composite electrolyte film with high ionic conductivity and a preparation process thereof. The film has a gradient function integrated structure and sequentially comprises a transmission layer composed of dense gadolinium-doped ceria, a functional layer constructed thereon, which is composed of a porous gadolinium-doped ceria skeleton and a lanthanum-strontium-gallium-magnesium oxide-alkali carbonate eutectic composite phase filled in the pores, and a SmNiO3 or SmCoO3 ultrathin interface modification layer covering the surface of the functional layer. The preparation process involves transmission layer forming sintering, functional layer slurry coating and step-by-step eutectic reaction heat treatment, and atomic layer deposition of the interface layer. The composite film can realize high oxygen ion conductivity and low electronic conductivity in a medium-low temperature range of 400-650 DEG C, significantly improves the battery efficiency and stability, and reduces the system operating temperature and cost.

The invention relates to the technical field of fuel cells, in particular to a method for improving performance of a direct coal fuel cell by using basic carbonate, which comprises the following steps: placing coal, basic carbonate and electrolyte in an anode chamber of the fuel cell, basic carbonate being selected from at least one of basic nickel carbonate, basic copper carbonate and basic cobalt carbonate, and electrolyte being selected from at least one of basic copper carbonate and basic cobalt carbonate; wherein the basic carbonate is an additive, and the mass ratio of the fuel to the basic carbonate to the electrolyte is 1: (0.05-0.4): (2-10). According to the method, on the basis that coal does not need to be pretreated, the performance of the direct coal fuel cell is improved by directly adding a certain amount of basic carbonate into the coal powder.

A method for breaking down a mixture, which is present in the form of solid particles, consisting of: (A) 0 to 99% by weight of metallic ruthenium, (B) 0 to 50% by weight of at least one element other than ruthenium, which is present in elementary form, selected from the group of elements of the atomic numbers 13, 21-30, 39-42, 45-52, and 72-83, (C) 0 to 99% by weight of ruthenium oxide, (D) 0 to 70% by weight of at least one solid element oxide other than ruthenium, (E) 0 to 30% by weight of at least one inorganic substance other than (A) to (D), and (F) 0 to 3% by weight of at least one organic substance, wherein the sum of the % by weight of the compounds (A) to (F) is 100% by weight and the ruthenium content of the mixture is 2 to 99% by weight, and wherein the method comprises the steps of: (1) optionally mixing said mixture with alkali carbonate by forming a blend, (2) alkaline oxidizing breakdown of the mixture or of the blend, respectively, formed in optional step (1) into molten potassium hydroxide using a gaseous oxidizing agent selected from the group consisting of air, oxygen, and air / oxygen mixtures, and without use of nitrate, and (3) cooling down the breakdown material formed in step (2) to a temperature below its solidification temperature, wherein the gaseous oxidizing agent is introduced into the melt in step (2).

The present application pertains to methods for making alkali hydroxide, or alkali carbonates, or alkali bicarbonates, or alkaline - earth sulfates. In one embodiment, a material comprising an alkaline earth is converted to an alkaline earth sulfite or bisulfite and reacted with an alkali sulfate to form an alkaline earth sulfate and alkali sulfite or bisulfite. The alkali sulfite or bisulfite is converted into an alkali hydroxide, or an alkali carbonate, or an alkali bicarbonate. In another embodiment, ammonium carbonate or ammonium bicarbonate is reacted with an alkali sulfate, to form ammonium sulfate and an alkali carbonate or alkali bicarbonate. A material comprising an alkaline earth is converted to an alkaline earth sulfite or bisulfite and reacted with the ammonium sulfate to form an alkaline earth sulfate and ammonium sulfite or ammonium bisulfite. The ammonium sulfite or bisulfite is regenerated into ammonia, or ammonium hydroxide, or ammonium carbonate, or ammonium bicarbonate.

The application pertains to processes for producing alkali hydroxides or alkali sulfites using large molecular weight acid intermediates. Generally, a component comprising an alkaline-earth cation—small molecular weight acid anion may be reacted with a component comprising an alkali sulfate to form a component comprising an alkali cation—small molecular weight acid anion and a component comprising an alkaline-earth sulfate. A series of additional steps results in forming a component comprising an alkali hydroxide, or an alkali carbonate, or an alkali bicarbonate, or any combination thereof.

The invention provides a low-sodium-sulfur basic carbonate small-particle precursor and a preparation method and application thereof.The preparation method comprises the following steps that a nickel-cobalt-manganese mixed source solution and a precipitator solution are introduced into a base solution for a co-precipitation reaction, the pH of a system is gradually reduced to the target pH in the co-precipitation reaction process, and the low-sodium-sulfur basic carbonate small-particle precursor is obtained under the target pH; reacting until the particle size D50 of a product reaches a target particle size D50, ending the reaction, and then aging, washing and drying to obtain the low-sodium-sulfur basic carbonate small-particle precursor; the precipitant solution comprises carbonate and metal hydroxide, and a complexing agent is not added during the co-precipitation reaction. According to the preparation method disclosed by the invention, the carbonate and the hydroxide are used as precipitants to synthesize the small-particle basic carbonate with low sodium-sulfur content, so that the influence of sodium-sulfur impurities in the precursor on the electrochemical performance of the cathode material obtained in the later period is avoided.

The invention belongs to the field of treatment of cyclohexane oxidation liquid, and particularly relates to a treatment method of cyclohexane oxidation liquid, which comprises the following steps: carrying out neutralization reaction on the cyclohexane oxidation liquid and alkali liquor A, and separating to obtain an oil phase A and a water phase A; the oil phase A is a cyclohexane solution enriched with cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone; the alkali liquor A is an aqueous solution in which alkali carbonate is dissolved; carrying out decomposition reaction on the oil phase A and the alkali liquor B, and separating to obtain an oil phase B and a water phase B; the oil phase B is a cyclohexane solution enriched with cyclohexanol and cyclohexanone; the alkali liquor B is an aqueous solution in which alkali metal hydroxide is dissolved; wherein the neutralization reaction and / or the decomposition reaction are / is carried out in a fiber membrane reactor. The method provided by the invention has an excellent cyclohexane oxidation liquid treatment effect, and can reduce the alkali consumption in the decomposition process of the cyclohexane oxidation liquid and improve the decomposition yield.

The invention discloses a high-performance Cr: Ca3 (VO4) 2 crystal based on charge compensation and a preparation method and application thereof, and the method comprises the following steps: S1, according to a stoichiometric ratio, weighing Cr2O3, CaCO3, V2O5 and alkali carbonate or oxide, carrying out primary grinding in a ball mill, uniformly mixing, and pressing into a block material; wherein alkali metal ions in the alkali metal carbonate or oxide are used as a charge compensation agent, and the doping amount of the alkali metal ions is 0.1-15 at%; s2, placing the block material in a corundum cup, heating to 1100 DEG C in a muffle furnace, carrying out constant-temperature synthesis for 10 hours, taking out the block material, carrying out secondary grinding in the ball mill again, uniformly mixing, tabletting, and carrying out constant-temperature synthesis for 10 hours at 1200 DEG C to obtain a sheet material; and S3, putting the sheet material into a platinum crucible, growing crystals by adopting a Czochralski method, pulling the crystals out of the liquid level after the growth is finished, and cooling to room temperature at a cooling rate of 5-30 DEG C / h to obtain the high-performance Cr: Ca3 (VO4) 2 crystals based on charge compensation.