51results about "Chromates/bichromates" patented technology

The invention relates to the technical field of battery sodium supplementation agents, in particular to a sodium supplementation agent with a core-shell structure, a preparation method and a positive pole piece. The preparation method comprises the following steps: providing a core material containing sodium salt; a first coating process: providing a first coating material containing organic fluorine, mixing the core material containing the sodium salt with the first coating material, and performing first sintering to obtain a primary coating coated with a first coating layer; and a second coating process: providing a second coating material containing a carbon source, mixing the second coating material with the primary coating, and carrying out second sintering to obtain the sodium supplement which is coated with a first coating layer and a second coating layer and has the core-shell structure. The invention provides the sodium supplementing agent with the core-shell structure, the preparation method and the positive pole piece, so that the problem of poor sodium supplementing performance of the sodium supplementing agent in the related technology is solved.

The invention relates to a preparation method of a carbon-coated sodium chromite material and application of the carbon-coated sodium chromite material prepared by the method, and the preparation method comprises the following steps: (1) weighing a chromium source, a sodium source and a carbon source, respectively heating and drying, and uniformly mixing to obtain mixed powder; (2) putting the mixed powder into a ball mill for ball milling, and then preparing into sheets; (3) calcining in an inert atmosphere to obtain a sodium chromite precursor; (4) performing ball milling in a ball mill, and stirring in a carbon source saturated solution; (5) baking the stirred materials at a high temperature; and (6) calcining the baked product in an inert atmosphere. The preparation method is simple, low in cost and free of redundant by-products, comprehensive and complete carbon coating of the sodium chromite material is achieved through a distributed carbon coating method, side reactions are effectively prevented, the formed carbon coating layer is good in uniformity, and the service life of the sodium chromite material is prolonged. The sodium ion battery prepared from the material has high specific capacity, good rate capability and excellent cycle stability.

Provided is a copper chromium oxide spinel having a particle size used when made into a resin molded article and plating bonding properties, a resin composition of the same, a resin molded article, and a method for producing the copper chromium oxide spinel. Specifically, provided is a copper chromium oxide spinel containing molybdenum and having a D50 of 2.0 μm or less.

A cathode for a battery includes a cathode material with the chemical formula Li1+δFexCryO2 where 0≤δ≤1, and δ+x+y=2. In some variations, the cathode material has a disordered rock-salt crystal structure and the chemical formula Li1+δFexCryO2 where 0≤δ≤1, and δ+x+y=2. And in at least one variations, a method of forming the cathode material includes wet ball milling solid precursors of lithium, iron, and chromium and forming a slurry, drying the slurry and forming a powder, sintering the powder, and dry ball milling the powder and forming the cathode material with the disordered rock-salt crystal structure and the chemical formula Li1+δFexCryO2 where 0≤δ≤1, and δ+x+y=2.

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula M1aM22-aM3bNb34-bO87-c-dQd.

The present invention relates to an active electrode material and a method for producing the active electrode material. Such materials are of interest as active electrode materials for lithium-ion or sodium-ion batteries. The present invention relates to a compound represented by the general formula M1 a Al 1-a M2 b Nb 11-b O 29-c-d Q d The active electrode material is represented by the formula:

The invention relates to active electrode materials and to methods for the manufacture of active electrode materials. Such materials are of interest as active electrode materials in lithium-ion or sodium-ion batteries. The invention provides an active electrode material expressed by the general formula M1aM21-aM3bNb49-bO124-c-dQd.

The invention relates to a lithium-rich ruthenium-based positive electrode material and a preparation method thereof, in particular to a long-circulation lithium-rich ruthenium-based positive electrode material based on high-energy ball milling morphology regulation and control and a preparation method thereof. In order to solve the technical problem that the existing Li2RuO3 material is poor in long-cycle stability, the chemical expression of the long-cycle lithium-rich ruthenium-based positive electrode material disclosed by the invention is Li2Ru1-x-yTixCryO3, and x = y = 0.0375-0.125. The preparation method comprises the following steps: performing high-energy ball milling on Li2CO3 powder, RuO2 powder, TiO2 powder and Cr2O3 powder to regulate and control the particle morphology to obtain mixed powder, and calcining the mixed powder to obtain the long-circulation lithium-rich ruthenium-based positive electrode material based on high-energy ball milling to regulate and control the morphology. The capacity retention ratio of the long-cycle lithium-rich ruthenium-based positive electrode material is 95.8%-98.7% after 300 cycles at 0.5 C, and the preparation method is simple and can be used in the field of lithium batteries.

The invention discloses a method for co-processing chromium-containing sludge and waste sulfuric acid and recycling the chromium-containing sludge and the waste sulfuric acid, which comprises the following steps: S1, sieving the chromium-containing sludge to remove impurities, mixing a strong acid solution formed by mixing the waste sulfuric acid and concentrated sulfuric acid with the chromium-containing sludge for acid dissolution, and filtering to obtain a trivalent chromium-containing solution; s2, NaOH is added into the solution containing trivalent chromium to adjust the pH value to be alkaline, then an oxidizing agent is added for an oxidation reaction, and a solution containing hexavalent chromium is obtained; s3, adding Na2CO3 into the hexavalent chromium-containing solution for neutralization, and filtering to obtain a sodium chromate-containing solution; and S4, carrying out vacuum evaporative crystallization on the solution containing sodium chromate to obtain sodium chromate crystals. According to the method, the chromium-containing sludge and the waste sulfuric acid are subjected to cooperative treatment, and the purposes of harmlessness and recycling of the multi-source hazardous waste are achieved.

Novel compounds having a sortovite-related structure are disclosed. The compounds may be colored and are useful as pigments. The compounds are durable in terms of acid stability tests, which show that the pigments do not substantially discolor when exposed to weak acids such as rain. The compounds disclosed herein are typically inexpensive to synthesize from earth-abundant, environmentally friendly elements or minerals, and therefore offer advantages over existing pigments in the art.

The invention discloses a sodium ion battery positive electrode material with a core-shell structure and an in-situ coating preparation method of the sodium ion battery positive electrode material, and belongs to the technical field of sodium ion batteries, the structural formula of the sodium ion battery positive electrode material is NaNixFeyMn (1-x-y) O2 (at) NaCrO2, firstly, the surface of a precursor is uniformly coated with chromium hydroxide through a coprecipitation method, and a chromium hydroxide coated precursor NixFeyMn (1-x-y) (OH) 2 (at) Cr (OH) 3 is obtained; the preparation method comprises the following steps: firstly, preparing NaNixFeyMn [1-x-y] O2 (at) NaCrO2, then mixing the NaNixFeyMn [1-x-y] O2 (at) NaCrO2 with a sodium source, and performing high-temperature sintering to prepare the sodium ion battery positive electrode material NaNixFeyMn [1-x-y] O2 (at) NaCrO2 with the core-shell structure, the positive electrode material is decomposed during first charging to provide active sodium, sodium loss caused by formation of an SEI / CEI membrane is effectively compensated, the specific capacity and cycling stability of the positive electrode material are remarkably improved, and the preparation method is suitable for industrial production of sodium ion batteries.

A lithium-containing oxide having a cationic-disordered rock salt-type structure,in which, when a solid 7Li-NMR spectrum has been measured, a signal 1 having a half width of more than 0 ppm and 40 ppm or less and a signal 2 having a half width of more than 100 ppm and 2000 ppm or less are observed in a range of a chemical shift of −3000 to 3000 ppm for which a peak of a 1 mol / L LiCl aqueous solution is set to 0 ppm, andan integrated intensity of the signal 1 relative to a total of integrated intensities of the signal 1 and the signal 2 is more than 0% and 60% or less.

The invention discloses a method for preparing sodium chromate from chromium-containing wastewater, comprising the steps of resin activation, resin adsorption elution and resin regeneration. The method can achieve high efficiency and low cost in preparing sodium chromate from chromium-containing wastewater by selecting appropriate resin and optimizing process parameters, without secondary pollution to the environment. The treated water has good quality and meets national emission standards. Moreover, a large amount of chromium-containing compounds can be recycled and utilized, thereby generating economic benefits.

The application provides a positive electrode material and a preparation method thereof, a positive electrode sheet and a lithium ion battery, and comprises a positive electrode active material and a coating layer coated on the surface of the positive electrode active material, wherein the coating layer comprises a lithium-rich reverse perovskite lithium supplement and a conductive agent, the mass content of the lithium-rich reverse perovskite lithium supplement is 0.01-10% of the mass of the positive electrode active material, and the mass content of the conductive agent is 0.01-3% of the mass of the positive electrode active material. Compared with the prior art, the positive electrode material provided by the application uses a lithium-rich reverse perovskite compound as a lithium supplement, is simultaneously compounded with the positive electrode active material to form a coating type structure, can additionally provide a large amount of lithium ions, makes up for the irreversible lithium loss of the negative electrode, and improves the reversible capacity of the full battery system.

The application discloses a method for preparing a perovskite material rich in oxygen defects by ionizing radiation. The method comprises the following steps: weighing a certain amount of perovskite oxide material, dispersing the perovskite oxide material in a mixed solution of a hydroxyl shielding agent and deionized water, transferring the perovskite oxide material to a test tube after ultrasonic dispersion, sealing the test tube after oxygen removal by blowing in inert gas, and placing the test tube near an ionizing radiation source to prepare a perovskite material rich in oxygen defects. The ionizing radiation source used in the application includes one or more of a gamma ray source, a high-energy X-ray source, an accelerator source and a nuclear waste or space radiation source. The reaction is carried out at normal temperature and pressure, the process is simple, controllable, the content of oxygen defects introduced in the catalyst is adjusted by adjusting the absorbed dose, the whole process is green and environmentally friendly, has significant industrialization advantages, and is expected to be used for large-scale preparation of perovskite materials rich in oxygen defects, and has a wide application prospect in the industrial field.

A system for the synthesis of magnetoelectronically tunable spinel ferrite nanoparticles, comprising: a) a precursor preparation unit for the preparation of a homogeneous nitrate precursor solution, wherein the precursor preparation unit facilitates the dissolution of stoichiometric amounts of magnesium nitrate hexahydrate, nickel nitrate hexahydrate, iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate in deionized water; b) a fuel mixing unit configured to introduce a binary mixture of urea and glucose into the dissolved homogeneous nitrate solution in a fuel-oxidant ratio that achieves fuel equivalence; c) a gel formation unit configured to maintain the temperature at 70-80 °C under continuous stirring to convert the fuel mixture into a viscous gel; d) a combustion unit comprising a preheated muffle furnace maintained at 450 ± 10 °C and enabling the initiation of a self-propagating combustion reaction; and e) a calcination plant configured for the thermal treatment of crushed precursor ash at 600 °C for 2 hours and subsequently at 750 °C for 2 hours to produce phase-pure cubic spinel Mg 1-x Ni x To produce FeCrO4 nanoparticles.

The invention relates to a mixed-phase oxide for use as an active electrode material, e.g. in lithium- ion or sodium-ion batteries. The mixed-phase oxide comprises Nb and Ti and further comprises M(III) and / or M(II); wherein M(III) is selected from Cr, Al, Ga, and mixtures thereof; M(II) is selected from Zn, Cu, Mg, and mixtures thereof; wherein the mixed-phase oxide comprises an interpenetrating mixture of a first phase and a second phase; wherein the first phase has the crystal structure of TiNb2O7 and the second phase has the crystal structure of Zn2Nb34O87.

The invention relates to a desiliconization method of chromite alkali liquor, in particular to the field of chromium salt production, and the desiliconization method comprises the following steps: adding magnesium salt into the chromite alkali liquor for stirring treatment, and then carrying out solid-liquid separation to obtain desiliconization liquid; wherein the solid-to-liquid ratio g / L of the magnesium salt to the chromite alkali liquor in the stirring treatment is (0.5-10): 1; the temperature of the stirring treatment is 30-95 DEG C; the stirring treatment time is 0.5 to 8 hours. According to the deep desilicication method, an adsorption-coprecipitation synergistic effect method is adopted, soluble magnesium salt is added firstly, specific reaction conditions are controlled, the magnesium salt and aluminum in the solution are subjected to an in-situ reaction to generate magnesium-aluminum hydrotalcite, and silicon in the chromite alkaline leaching solution is synchronously and deeply removed.

The application discloses a core-shell structure sodium ion battery positive electrode material and an in-situ coating preparation method thereof, and belongs to the technical field of sodium ion batteries. x Fe y Mn 1‑x‑y O2@NaCrO2, the application first uniformly coats chromium hydroxide on the surface of a precursor through a coprecipitation method to obtain a chromium hydroxide coated precursor Ni x Fe y Mn 1‑x‑y (OH)2@Cr(OH)3; then, the chromium hydroxide coated precursor is mixed with a sodium source and sintered at high temperature to prepare the core-shell structure sodium ion battery positive electrode material NaNi x Fe y Mn 1‑x‑y O2@NaCrO2, the positive electrode material decomposes to provide active sodium during the first charging, effectively compensates for sodium loss caused by the formation of SEI / CEI films, significantly improves the specific capacity and cycle stability of the positive electrode material, and is suitable for industrialized production of sodium ion batteries.

This invention belongs to the field of solid waste resource utilization in the battery industry, specifically disclosing a method for utilizing chromium slag. Through steps such as mixing and grinding chromium slag and sodium-containing alkaline substances, low-temperature roasting and crystallization, water leaching, crystallization, and separation, this invention fully extracts Cr and P from the chromium slag, and separates and prepares sodium phosphate, sodium chromate, and industrial iron ore products. This achieves complete resource utilization of valuable elements in the chromium slag and solves the environmental pollution problem of chromium slag in the nickel salt production process of nickel-iron alloys.

The present invention relates to the technical field of nanocomposite material preparation, and discloses a barium chromate (BaCr2O4) nanocomposite material using nitrogen-doped graphene oxide intercalation, a preparation method, and its application. The preparation method comprises the following steps: (1) synthesizing barium chromate; and (2) synthesizing a BaCr2O4@GO nanostructured composite material. The BaCr2O4@GO nanocomposite material has a high storage capacity and is suitable for use as a supercapacitor electrode material.

The invention discloses an NFPP-coated sodium chromite core-shell structure positive electrode material and a preparation method thereof, and belongs to the technical field of sodium ion battery positive electrode materials. The preparation method comprises the following steps: firstly, synthesizing a sodium chromite core material by adopting a high-temperature solid-phase method; then preparing NFPP precursor sol containing an iron source, a phosphorus source and a sodium source; the preparation method comprises the following steps: uniformly dispersing a NaCrO2 core in a sol, carrying out controllable heterogeneous nucleation and growth on an NFPP precursor on the surfaces of NaCrO2 particles by controlling the pH value and the concentration, drying, and carrying out heat treatment in an inert atmosphere to finally form a core-shell structure positive electrode material taking NaCrO2 as a core and NFPP as a shell. According to the invention, the NFPP coating layer is utilized to effectively inhibit the side reaction between NaCrO2 and electrolyte, the dissolution of transition metal and the collapse of a layered structure in the circulation process, so that the circulation stability and safety of the material are greatly improved, and meanwhile, the high voltage and high capacity characteristics of NaCrO2 are maintained.

To provide a copper oxide chromium spinel having a particle size and plating bonding property which can be suitably used in a resin molding, and a resin composition, a resin molding, and a manufacturing method of the copper oxide chromium spinel thereof.SOLUTION: A copper oxide chromium spinel including molybdenum and having D50 of 2.0 μm or under is provided.SELECTED DRAWING: None

An object is to provide a copper chromium oxide spinel having a particle size suitably used when made into a resin molded article and plating bonding properties, a resin composition of the same, a resin molded article, and a method for producing the copper chromium oxide spinel. Specifically, provided is a copper chromium oxide spinel containing molybdenum and having a D50 of 2.0 µm or less.

The application provides a purification method of a chromium-containing mixed salt, the mixed salt comprising sodium carbonate, sodium bromide and a heavy metal chromium compound, in the method, a high-purity sodium bromide aqueous solution is prepared from the mixed salt and chromium salt is recovered, and the method comprises the following steps: preparing a crude sodium bromide solution, preparing a chromium removal agent by using a barium compound or a calcium compound, removing chromium from the crude sodium bromide solution by using the chromium removal agent and collecting a filtrate A; and treating the filtrate A to obtain a high-purity sodium bromide aqueous solution. In the method, the sodium carbonate in the crude sodium bromide solution is all converted into sodium bromide; by using the method, the chromium in the sodium bromide is removed and converted into barium chromate or calcium chromate products; the obtained sodium bromide no longer contains the heavy metal chromium and can be directly used for preparing high-purity sodium bromide or preparing a sodium bromide aqueous solution.

The invention discloses an ionic liquid-anion exchange system and a separation method for separating vanadium and chromium from a vanadium-containing alkaline extracting solution, and belongs to the technical field of vanadium and chromium separation.The ionic liquid-anion exchange system is composed of carbonate of organic amine and a diluent, the carbonate of the organic amine is carbonic acid type receptor ammonium salt, and the diluent is a diluent. The diluent is a mixture of an alcohol compound and a hydrocarbon compound. According to the method, an ionic liquid-anion exchange system is adopted, so that the problem of selective separation caused by high chromium concentration and similar chemical properties of vanadium and chromium in the alkaline vanadium-containing extracting solution is solved. The system can efficiently and highly selectively extract vanadium, so that the recovery rate of vanadium and the product purity are remarkably improved while deep separation of vanadium and chromium is realized, and the technological process is green and environment-friendly.

The invention provides a method for purifying chromium-containing mixed salt, the mixed salt comprises sodium carbonate, sodium bromide and a heavy metal chromium compound, in the method, the mixed salt is used for preparing a high-purity sodium bromide aqueous solution, and the chromium salt is recovered; comprising the following steps: preparing a crude sodium bromide solution, preparing a chromium removal agent by using a barium compound or a calcium compound, removing chromium from the crude sodium bromide solution by using the chromium removal agent, and collecting filtrate A; and treating the filtrate A to obtain a high-purity sodium bromide aqueous solution. According to the method disclosed by the invention, sodium carbonate in the crude sodium bromide is completely converted into sodium bromide; by adopting the method, chromium in the sodium bromide is removed, and the sodium bromide is converted into a barium chromate or calcium chromate finished product; the obtained sodium bromide does not contain heavy metal chromium and can be directly used for preparing high-purity sodium bromide or preparing a sodium bromide aqueous solution.

The present invention relates to a mixed-phase oxide used as an active electrode material, for example, in a lithium-ion or sodium-ion battery. The mixed-phase oxide contains Nb and Ti, and also contains M(III) and / or M(II); wherein M(III) is selected from Cr, Al, Ga, and mixtures thereof; M(II) is selected from Zn, Cu, Mg, and mixtures thereof; wherein the mixed-phase oxide contains an interpenetrating mixture of a first phase and a second phase; wherein the first phase has a crystal structure of TiNb2O7, and the second phase has a crystal structure of Zn2Nb 34 O 87 of.

The invention relates to a method for recovering chromate. The method comprises the following steps: (1) adsorbing the chromium-containing wastewater by using ion exchange resin; (2) eluting and regenerating the adsorbed resin by using an alkaline solution, and collecting an eluent; (3) adjusting the pH value of the collected eluent to be acidic, and concentrating to obtain a chromate concentrated solution; (4) adding a sulfate precipitator into the chromate concentrated solution, and removing sulfate in a precipitation manner; (5) crystallizing and drying the obtained chromate solution; wherein the alkali solution is a sodium hydroxide solution, and the concentration of the alkali solution is 20-25%. According to the method, the cost required by evaporation and concentration can be greatly reduced, and the removal efficiency of sodium sulfate is improved.

The invention discloses a method for preparing a copper chromite black pigment by recycling organic silicon waste contact bodies in organic silicon production. The method specifically comprises the following steps: adding water into the organic silicon waste contact bodies to be treated in the organic silicon production, stirring and leaching, and then carrying out filter pressing to obtain filtrate a and filter residues b; grinding the filter residue b, adding concentrated sulfuric acid, and carrying out acid leaching to obtain an acid-leached material c; the acid leaching material c is merged into the filtrate a for water leaching, then filter pressing is conducted, filtrate d and filter residues e are obtained, the filter residues e are silicon powder, and the silicon powder enters an organic silicon production system; adding a P204 extracting agent into the filtrate d, and extracting to obtain a P204 extracting solution f and an extracted solution g; sulfuric acid is added into the P204 extraction liquid for reverse extraction, and reverse extraction liquid h and raffinate i are obtained; after the strip liquor h is subjected to oil removal, chromic nitrate, stearic acid and PEG200 are sequentially added and mixed for a reaction, and reaction liquor j is obtained; and evaporating, drying, crushing, calcining and grinding the reaction liquid j to obtain the copper chromite black pigment.