35results 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.

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.

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.

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 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 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.

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 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.

This utility model discloses a treatment system for recovering industrial-grade sodium chromate from chromium-containing electroplating wastewater. The system is sequentially connected to a pretreatment system, an ion exchange system, an evaporation and concentration system, a purification system, and an evaporation and crystallization system. The pretreatment system removes suspended solids. The ion exchange system contains at least four ion exchange columns and an eluent tank; the coordinated operation of multiple columns ensures sufficient adsorption and elution of chromium, increasing the concentration of hexavalent chromium in the eluent, reducing the load on subsequent evaporation equipment, and shortening processing time. The evaporation and concentration system uses an MVR evaporator and integrates an online density meter. The purification system is equipped with a purification reaction vessel with a detachable pH meter probe, which can quantitatively remove sulfate, reducing the difficulty of salt separation and crystallization, increasing the number of mother liquor circulations, and thus improving the chromium recovery rate. The feed to the eluent tank allows for reasonable adjustment of the alkali dosage according to different concentrations of components, avoiding waste and reducing costs. The detachable pH meter probe facilitates maintenance, ensures accurate monitoring, and improves the stability of sulfate removal rate and the quality of sodium chromate products.

The invention relates to the technical field of sodium ion electronics, and particularly discloses a sodium chromite preparation device and method based on a mechanochemical method.The sodium chromite preparation device comprises a base, a driving disc is rotationally arranged on the base, a main ball milling tank is rotationally arranged in the middle of the driving disc, and two symmetrically-arranged auxiliary ball milling tanks are rotationally arranged on the driving disc. Through the synergistic effect of the main ball-milling tank and the auxiliary ball-milling tank, argon serving as protective gas serves as a carrier to continuously flow and dynamically carry refined chromic oxide and sodium carbonate in the auxiliary ball-milling tank into the main ball-milling tank, the continuous process of raw material pretreatment and mechanochemical reaction is achieved, material accumulation is avoided, real-time contact of reactants is ensured, and the production efficiency is improved. And the product is the sodium chromite powder under high-energy ball milling, and mechanical crushing and secondary ball milling are not required to be performed on the product, so that the production period can be greatly shortened, and the production efficiency is improved.

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 utility model discloses a hexavalent chromium-containing wastewater treatment and chromium resource recovery system which comprises a flocculation impurity removal mechanism, a first filter pressing part, an acidification mechanism, an ion exchange mechanism and a crystallization mechanism, chromium-containing wastewater, alkali liquor and a flocculating agent can be introduced into the flocculation impurity removal mechanism, so that impurity metal ions in the chromium-containing wastewater are precipitated; supernate of the flocculation impurity removal mechanism can be introduced into the first filter pressing part for filter pressing; acid liquor can be introduced into the acidification mechanism so as to adjust the pH of supernate of the flocculation impurity removal mechanism and the pH of supernate of the first filter pressing part; the ion exchange mechanism can adsorb hexavalent chromium ions in the supernate, and the alkali desorption solution desorbs and regenerates the adsorbed hexavalent chromium ions into a chromium concentrated solution; chromic acid can be introduced into the crystallization mechanism to acidify the chromium concentrated solution, and the acidified chromium concentrated solution can be concentrated and dried to obtain dichromate. According to the hexavalent chromium-containing wastewater treatment and chromium resource recovery system provided by the utility model, the chromium-containing wastewater is treated, and the chromium recovery amount is increased.

In one aspect, the present invention provides a solid-state electrolyte material. The solid-state electrolyte material comprises a composition of Formula (XX), (XX-A), (XX-B), (XX-C), (I), (Ia), and / or (Ib), as described herein. Another aspect provides a method of making a green body. A further aspect provides a method of making a sintered solid-state electrolyte material.

The application provides a sodium ion battery layered oxide positive electrode material and a preparation method and application thereof. The sodium ion battery layered oxide positive electrode material is a P-type structure material, and metal elements in the sodium ion positive electrode material, except sodium, include chromium and tantalum. The positive electrode material provided by the application has a P2 configuration, widens the interplanar spacing of a sodium dichromate layered oxide, effectively avoids the complex phase transition problem of sodium dichromate used as a positive electrode material of a sodium ion battery, the introduction of tantalum ions solves the low coulomb efficiency problem caused by the decrease of sodium ion content due to the configuration design, and helps electronic rearrangement, realizes the disordered arrangement of sodium / vacancies in the material, and improves the rate, capacity and cycle performance of the positive electrode material.

The invention provides a flower-like Bi2CrO6 oxygen production photocatalyst and a preparation method thereof, and belongs to the technical field of photocatalytic material preparation. According to the preparation method, bismuth nitrate and potassium chromate are taken as raw materials, and microwave heating is carried out at a relatively low temperature (100 DEG C), so that the reaction can be completed within 2 hours. The preparation method disclosed by the invention is mild, low in energy consumption, simple, rapid and energy-saving, and experimental equipment is provided. The prepared bismuth chromate photocatalyst sample is uniform in size, has a large specific surface area and rich active sites, and has higher catalytic activity due to the fact that the sheet thickness is reduced and the migration distance of electrons and holes from the interior of a semiconductor to the surface is shortened.

The invention belongs to the technical field of inorganic nano-materials, and discloses a preparation method of a series of inorganic nano-materials and application of the inorganic nano-materials in an LED (light-emitting diode), and the chemical general formula of the inorganic nano-materials is AxByDz: mM, x = 0, 1 or 3, y = 1, 2 or 3, z = 1, 4, 7 or 10, and 1 > = m > = 0. A is one or more of lithium, sodium, cesium, rubidium or potassium or blank; b is one or more of scandium, yttrium, lanthanum and the like; d is one or more of fluorine, chlorine, bromine, iodine, phosphate radical, vanadate radical, sulfate radical, molybdate radical or CrO4; m is a substitution element at the B site and is one or more of Sc, Y, La, Ce and the like. The preparation method comprises the following steps: adding each metal salt precursor solution into an anion salt solution, reacting, filtering and drying to finally obtain a target product. The method has the advantages of simplicity and convenience in preparation, low cost, good repeatability and the like, is suitable for large-scale industrial production, and has wide application prospects and potential economic benefits in the field of light-emitting illumination.

Provided are an interconnector and an electronic apparatus including the interconnector. The interconnector includes: a metal layer; a dielectric layer surrounding at least a portion of the metal layer; and an interlayer disposed between the metal layer and the dielectric layer and including a ternary metal oxide.

The invention discloses a cathode catalyst for generating vinyl chloride through electrocatalytic dechlorination of 1, 2-dichloroethane and application of the cathode catalyst. The cathode catalyst is prepared by the preparation method comprising the following steps: step 1, preparing a metal A precursor and a metal B precursor into a mixed solution; step 2, adding a precipitant into the mixed solution, precipitating and separating out the metal A and the metal B, uniformly mixing, transferring the obtained mixture into a reaction kettle for reaction, cooling, and performing centrifugal separation, washing and drying to obtain a dried product; and 3, carrying out high-temperature calcination on the dried product to obtain the catalyst. The invention provides a cathode for generating vinyl chloride by electrocatalytic dechlorination of 1, 2-dichloroethane, and the cathode contains the cathode catalyst. The invention further provides a method for generating vinyl chloride through electrocatalytic dechlorination of 1, 2-dichloroethane by using the cathode. The cathode catalyst provided by the invention has good reaction activity, and can significantly improve the selectivity of vinyl chloride.

The invention discloses a sodium-ion battery positive electrode material with high cycling stability and a preparation method thereof, and belongs to the technical field of sodium-ion batteries, the structural formula of the positive electrode material is NaCrO2atAl2O3, and NaCrO2 is uniformly coated with Al2O3. The preparation method comprises the following steps: firstly, adopting a fractional precipitation method, and controlling the pH value of a solution, the reaction temperature and the aging time to prepare a sodium-ion battery positive electrode material with high cycling stability; preparing a precursor Cr (OH) 3-Al (OH) 3 with chromium hydroxide uniformly coated with aluminum hydroxide; then the precursor and a sodium source are mixed according to a certain molar ratio, sintering treatment is carried out, the positive electrode material NaCrO2-coated Al2O3 is obtained, a shell layer of the positive electrode material Al2O3 can isolate direct contact of NaCrO2 and electrolyte, overgrowth of a CEI film is reduced, the volume change of material crystals is inhibited, the stability of a surface lattice structure is enhanced, and the service life of the positive electrode material is prolonged. Therefore, the material is endowed with good electrochemical performance and cycle performance.