38 results about "Rubidium hydroxide" patented technology

The invention provides a preparation method of cubic ultra-fine calcium carbonate particles. The method comprises the following steps: (1) adding a nucleation promoter to calcium hydroxide suspension liquid, wherein the nucleation promoter is selected from more than one of glucose, sucrose or sodium citrate; (2) carbonizing by introducing carbon dioxide until the pH value is 8-12, adding a crystal modifier and ageing for 0.5-10 hours, wherein the crystal modifier is selected from one of sodium chloride, sodium carbonate, sodium bicarbonate or sodium hydroxide; (3) further introducing carbon dioxide and carbonizing until the pH value is 6.5-7.0; (4) coating by adding a coating agent, filtering and drying to obtain a product, wherein the coating agent is selected from a resin acid, a resin acid alkali metal salt, a fatty acid or a fatty acid alkali metal salt. According to the calcium carbonate particles, the particle sizes are 90-180nm, the calcium carbonate particles are in a cubic shape, and the specific surface area is 10-18m<2>/g. Thus, the cubic ultra-fine calcium carbonate particles can be used as functional fillers in coating, rubber, plastic and sealant industries.

A process material with compound artery is prepared from the Si source chosen from amorphous SiO2, si sol, silicon oxide solid, silicon gel, diatomite and water glass, the Al source chosen from sodium aluminate, sodium metaaluminate, aluminium sulfate, aluminium nitrate, etc, at least one of lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide and cesium hydroxide, and template agent through proportional mixing, reaction, ageing and crystallizing.

A method for the electrochemical production of ferrate salts in an aqueous electrolyte solution comprising one or more hydroxide components. Dramatically increased yields of ferrate salts are obtained from using a mixture of sodium hydroxide and potassium hydroxide. Preferably, both sodium hydroxide and potassium hydroxide are present in concentrations greater than 5 molar, most preferably at least 10 molar, i.e., 10 M NaOH and 10 M KOH. The anode is preferably a sacrificial anode made out of an iron-containing material to supply the iron necessary for the ferrate production reaction. The aqueous hydroxide solution, even a mixed potassium hydroxide (KOH) and sodium hydroxide (NaOH) solution, may be recycled and reused in the electrochemical cell, preferably after the extraction of the ferrate salt

A process for preparing a high-purity metal salt of complexon as trace-element fertilizer includes adding complexon and alkali (sodium hydroxide, potassium hydroxide, or ammonia) to water, reaction while stirring to obtain complexon salt, adding metal salt (iron hydroxide, manganese hydroxide, etc.) at 150 deg.C for 0.5-5 hr, and filter to remove insoluble substance.

Etching compositions and method of using the etching compositions comprising potassium hydroxide; one or more than one additional alkaline compounds selected from the group consisting of TEAH, TMAF and NH₄OH; and water; or etching compositions comprising one or more than one inorganic alkali basic hydroxides selected from the group consisting of potassium hydroxide, cesium hydroxide, sodium hydroxide, rubidium hydroxide, or lithium hydroxide; optionally one or more than one additional alkaline compounds; water; and optionally one or more corrosion inhibitors; wherein the composition preferentially etches silicon present on a substrate as compared to silicon dioxide present on said substrate.

The invention provides a method for preparing lithium hydroxide by an industrial-grade lithium carbonate solid and belongs to the field of preparation of lithium hydroxide. The lithium hydroxide is prepared by taking the industrial-grade lithium carbonate solid as a raw material; solid impurities, sodium, calcium, magnesium, aluminum, iron and other ions in the industrial-grade lithium carbonate solid are removed through pH value regulation, plate and frame filtration, multi-medium filtration, ultra-filtration and chelate resin adsorption treatment; the plate and frame filtration can separatesolid from liquid; the multi-medium filtration is used for removing suspended matters, colloids, organic matters and the like; the ultra-filtration can further reduce the contents of residual COD, thesuspended matters and macromolecular dissolved matters to realize the purification and the separation of the liquid; chelate resin enables the content of high-valent ions in the liquid to meet the bipolar membrane water ingress requirements; sulfate radicals in a pre-electrolyte migrate to an acid chamber and are combined with hydrogen ions decomposed by the surface of a bipolar membrane to formsulfuric acids; lithium ions in the pre-electrolyte migrate to an alkaline chamber and are combined with hydroxyl ions decomposed by the surface of the bipolar membrane to generate the lithium hydroxide.

A process for preparing high-purity complexed metal salt of complexon used for trace-element fertilizer includes such steps as adding complexon and sodium hydroxide to water, stirring while reaction to obtain sodium salt of complexant, adding metal salt which is one of FeCl3, iron sulfate, manganese carbonate, alkaline copper carbonate, zinc oxide, etc., and reaction at 70-150 deg.C.

The invention relates to a catalyst for biomass tar cracking and a preparation method thereof. The catalyst is prepared from biomass semicoke, tar, chromium oxide green, copper oxide, cesium hydroxide, lithium hydroxide, barium hydroxide, rubidium hydroxide, manganese dioxide, nickel oxide, sodium oxide, and alumina binder. The invention solves the problem of catalyst inactivation, such as separation and aggregation of metal oxides and auxiliary components and coking and carbon deposition, and realizes the recycling of biological semicoke catalysts, using the biomass pyrolysis catalyst to assist microwaves to pyrolyze and gasify biomass can obtain a high gasification efficiency and high-quality synthetic gas product under low temperature, exogenous gas, such as vapor, is not introduced forconsumption into the whole process, and therefore the energy consumption and production cost of the process are remarkably reduced.

The invention belongs to the technical field of preparation of inorganic compound lithium metaborate, and particularly discloses a preparation method of anhydrous lithium metaborate. The method comprises the following steps: dissolving lithium hydroxide in boiling water, and filtering to remove impurities; slowly adding boracic acid after being purified in hot lithium hydroxide solution, wherein the amount of boracic acid is slightly smaller than theoretical reacting weight; depositing so that the solution is cooled and crystallized to prepare lithium metaborate wet material; and then obtaining the finished product of anhydrous lithium metaborate through the steps of low-temperature primary drying, cracking, high-temperature secondary drying and the like. According to the method, lithium metaborate is prepared from lithium hydroxide and boracic acid through liquid phase reaction, the utilization rates of lithium hydroxide and boracic acid are improved, the yield coefficient of the system can reach more than 90%, the purity of the product can reach 99.99% and is higher than that of the product in the prior art, and the method is more suitable for the market requirements nowadays.

The invention provides a method for preparing lithium hydroxide by industrial-grade soluble lithium salt and belongs to the field of preparation of lithium hydroxide. The lithium hydroxide is preparedby taking the industrial-grade soluble lithium salt as a raw material; impurities, calcium, magnesium, aluminum, iron and other ions in the industrial-grade soluble lithium salt are removed through pH value regulation, plate and frame filtration, multi-medium filtration, ultra-filtration and chelate resin adsorption treatment; the plate and frame filtration can separate solid from liquid; the multi-medium filtration is used for removing suspended matters, colloids, organic matters and the like; the ultra-filtration can further reduce the contents of residual COD, the suspended matters and macromolecular dissolved matters to realize the purification and the separation of the liquid; chelate resin enables the content of high-valent ions in the liquid to meet the bipolar membrane water ingress requirements; anions in a pre-electrolyte migrates to an acid chamber and are combined with hydrogen ions decomposed by the surface of a bipolar membrane to form dilute acids; lithium ions in the pre-electrolyte migrate to an alkaline chamber and are combined with hydroxyl ions decomposed by the surface of the bipolar membrane to generate the lithium hydroxide.

The invention belongs to the technical field of hydrometallurgy, in particular to a method for extracting Rb+ from low concentration brine and preparing high purity rubidium salt, which comprises thefollowing steps: saturating crude filtered brine through Rb+ adsorption column; stopping pumping brine and rinsing the Rb+ adsorption column with pure water, then rinsing the adsorption column with anammonium salt solution, eluting the Rb+ to obtain a first rich rubidium solution; concentrating the first rich rubidium solution to obtain a second rich rubidium solution; adding aluminum sulfate tothe second rich rubidium solution and carrying out recrystallization to obtain a highly pure rubidium aluminum sulfate crystal; adding barium hydroxide to the solution obtained after dissolution of the aluminum rubidium sulfate crystal to obtain a rubidium hydroxide solution; and adding acid to the rubidium hydroxide solution and carrying out the recrystallization to prepare the high purity rubidium salt. The method for extracting the Rb+ from the low concentration brine and preparing the high purity rubidium salthas the advantages of being high in efficiency, environmental in process and capable of preparing a variety of rubidium salts with a purity up to 99.99%.

The invention provides a synthetic method of a sodium potassium columbate ferroelectric nano structure with a monoclinic phase. The invention relates to a piezoelectric-ferroelectric nano material, and in particular relates to a synthetic method of a nano structure. The invention aims to solve the technical problems that during the preparation of an existing piezoelectric material, lead oxide is volatilized to result in poor consistency and high cost of a product and the toxicity of lead is high, and successfully prepare the sodium potassium columbate nano structure with the monoclinic phase. The synthetic method comprises the following steps: adding sodium acetate and potassium acetate into glycol, adding a niobium ethoxide solution, and drying to obtain a xerogel precursor; adding the xerogel precursor into an aqueous solution containing sodium hydroxide and potassium hydroxide; heating and preserving the heat; then cooling to the room temperature; taking out sodium potassium columbate powder; performing centrifugal washing for a plurality of times until the pH value is equal to 7; and then drying to obtain the sodium potassium columbate ferroelectric nano structure. The synthetic method provided by the invention adopts sodium potassium columbate sol prepared by a sol-gel method, so that the ratio of sodium ions to potassium ions to niobium ions in the nano structure can be accurately controlled; and hydro-thermal reaction is utilized, so that the sodium potassium columbate nano structure with a pure phase is obtained by virtue of low-temperature crystallization. The synthetic method provided by the invention belongs to the field of preparation of nano structures.

The invention discloses alpha bismuth oxide/bismuth vanadate and a preparation method thereof. The preparation method provided by the invention comprises the following steps that firstly adding bismuth nitrate into nitric acid; adding ammonium metavanadate into a sodium hydroxide solution; mixing the two solutions for regulating and controlling the pH values; then, performing drying, grinding androasting to obtain bismuth vanadate; mixing the obtained bismuth vanadate powder with the bismuth oxychloride powder; performing dispersion; then, adding a sodium hydroxide solution; performing stirring, washing and drying; then, obtaining the alpha bismuth oxide/bismuth vanadate powder. The sodium hydroxide is used for performing in-situ conversion on the bismuth oxychloride to obtain the alpha bismuth oxide in the alpha bismuth oxide/bismuth vanadate. The method has the advantages that the proportioning ratio between two phases of ingredients can be easily regulated and controlled; the production cost is low; the process method is simple and convenient, and the like.

The invention discloses a sodium salt chemical ice bag and a preparation method thereof. The ice bag is composed of the following components in parts by weight: 40 to 50 parts of sodium nitrate, 10 to 20 parts of sodium borate, 20 to 30 parts of sodium sulfate decahydrate, 1 to 3 parts of sodium carboxymethyl cellulose, 1 to 3 parts of sodium silicate, 1 to 5 parts of sodium chloride, and 1 to 5 parts of sodium hydroxide. The preparation method comprises the following steps: precisely weighing the components according to the formula mentioned above, adding weighed sodium carboxymethyl cellulose into sodium borate, stirring, heating, stopping heating when the solution turns transparent so as to obtain a solution A; sequentially adding sodium nitrate, sodium sulfate decahydrate, and sodium silicate into the solution A under stirring, evenly stirring to obtain a solution B; adding sodium hydroxide into the solution B, evenly stirring, then adding sodium chloride, evenly stirring, when the solution becomes transparent, and packing the solution into bags. The provided chemical ice bag has the advantages of low refrigeration temperature and long refrigeration time.

The invention relates to a method for improving the stability of a high-concentration negative electrode electrolyte during the operation of an all-vanadium redox flow battery. A soluble alkaline substance is at least one in the group consisting of ammonia water, sodium hydroxide, potassium hydroxide, aluminum hydroxide, lithium hydroxide and rubidium hydroxide. The high-concentration negative electrode electrolyte is a sulfuric acid aqueous solution of divalent and/or trivalent vanadium, the vanadium ion concentration is 1.6-4 mol/L, and the sulfuric acid concentration is 0.5-3 mol/L. A stabilizer for improving the stability of the high-concentration negative electrode electrolyte used in the present invention can restore the H+ concentration in the high-concentration negative electrode electrolyte to a normal level in a short time, and the stability of the high-concentration negative electrode electrolyte is improved. The sources of raw materials used in the present invention are wide, the price is low, the process operation is simple, the reaction speed is controllable, and the long-term high-efficiency stable operation of the battery can be ensured.

The invention discloses a supermolecule-based aqueous alkaline electrolyte with an ultra-wide working temperature range and an application thereof. The aqueous alkaline electrolyte is a solution formed by mixing a solute and a solvent, the solute is one or more than two of alkali metal hydroxides, and the alkali metal hydroxides are lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide or cesium hydroxide; and the solvent is a supramolecular solvent composed of water and dimethyl sulfoxide. The supermolecule-based aqueous alkaline electrolyte with the ultra-wide working temperature range has an extremely wide working temperature range of-70 DEG C to 100 DEG C, is relatively stable in performance, and can greatly improve the applicability of electrochemical energy storage devices such as supercapacitors and batteries based on the aqueous alkaline electrolyte in the all-day, all-season and extreme temperature fields.