65results about "Bicarbonate preparation" patented technology

A method of easily obtaining a recycled carbon material by removing more Li from a carbon-based negative electrode active material containing Li is provided. A manufacturing method for a recycled carbon material according to the present disclosure includes: a first thermal process step of thermally processing a carbon-based negative electrode active material containing Li together with ethylene carbonate at a temperature less than a boiling point of ethylene carbonate to obtain a thermally processed object containing lithium ethylene dicarbonate; and a second thermal process step of thermally processing the thermally processed object at a temperature more than or equal to the boiling point of ethylene carbonate to convert lithium ethylene dicarbonate into lithium carbonate.

The invention relates to the technical field of comprehensive utilization of non-ferrous metal smelting waste residues, and discloses a harmless treatment and valuable metal recovery method for arsenic-alkali residues, which comprises the following steps: carrying out selective leaching and antimony separation on the arsenic-alkali residues, and precipitating antimony by using solubility product difference to obtain arsenic-containing alkali filtrate; carrying out gradient carbonization crystallization under oxidation-reduction potential clamping on the filtrate, converting sodium carbonate into sodium bicarbonate crystals under the constraint of specific potential by utilizing the salting-out effect of pentavalent arsenic in a saturated sodium bicarbonate solution, separating out the sodium bicarbonate crystals, and filtering and separating to obtain a sodium bicarbonate product and arsenic-rich mother liquor; according to the method, through a coupling mechanism of potential clamping and gradient carbonization crystallization, the solubility difference of arsenic and alkali is constructed, the salting-out effect is utilized, the arsenic-alkali co-dissolution balance is broken on the premise that exogenous foreign ions are not introduced, and the arsenic-rich mother liquor is subjected to terminal mineralization to generate arsenic-containing mineral precipitates. Efficient separation and recovery of antimony and sodium carbonate and deep solidification of arsenic are realized.

The invention belongs to the technical field of high-salt-content trona ore production, and discloses a process for preparing sodium carbonate, baking soda and metal sodium. Comprising the following steps: extracting saline-alkali brine from high-salt-content trona ore, carrying out countercurrent reaction on the saline-alkali brine and carbon dioxide to generate baking soda slurry and high-salt low-alkali brine, carrying out solid-liquid separation on the baking soda slurry, adding hydrochloric acid into the high-salt low-alkali brine to generate sodium chloride brine, and calcining the solid part after solid-liquid separation to generate sodium carbonate. And partially fluidizing and cooling to generate baking soda, evaporating and crystallizing the generated sodium chloride brine into sodium chloride crystals, and heating, melting and electrolyzing the sodium chloride crystals to generate metal sodium and chlorine. The method realizes simultaneous production of sodium carbonate, baking soda and metallic sodium from the saline-alkaline brine, all saline and alkaline with economic value in the saline-alkaline brine are processed and utilized, and benefit development of the high-salt-content trona ore is realized.

A method for the extraction of lithium from a lithium bearing material containing alpha spodumene, the method comprising the steps of: Converting at least a portion of the alpha spodumene present in the lithium bearing material to beta spodumene; Subjecting the lithium bearing material to a leaching process at an elevated pressure in the presence of potassium carbonate to produce a leaching solution containing lithium carbonate; Performing a carbonation process on the leaching solution to convert at least a portion of the lithium carbonate to lithium bicarbonate; Performing a solid-liquid separation process on the leaching solution to separate a leach residue from the leaching solution; Precipitating lithium carbonate from the leaching solution; and Separating precipitated lithium carbonate from the leaching solution.

The present invention relates to an apparatus (10) and a process for capturing and recovering CO2 from the flue gas of a reheating furnace. Carbon dioxide is captured in a CO2 capture and separation unit (C) by membrane separation, adsorptive separation (such as PSA technique) or chemical absorption and gas regeneration and is divided into two CO2 streams (F1, F2). Wherein a CO2 stream (F1) is fed to a washing device (18), in which CO2 forms M2CO3 by means of a solution of an alkali metal hydroxide MOH, in particular NaOH or KOH, and M2CO3 reacts with a second CO2 stream (F2) in a downstream reactor (24) to form alkali metal bicarbonate (MHCO3). The heat recovered from the flue gas may be used in various parts / stages of the apparatus / process of the invention.

A method of easily obtaining a recycled carbon material by removing more Li from a carbon-based negative electrode active material containing Li is provided. A manufacturing method for a recycled carbon material according to the present disclosure includes: a first thermal process step of thermally processing a carbon-based negative electrode active material containing Li together with ethylene carbonate at a temperature less than a boiling point of ethylene carbonate to obtain a thermally processed object containing lithium ethylene dicarbonate; and a second thermal process step of thermally processing the thermally processed object at a temperature more than or equal to the boiling point of ethylene carbonate to convert lithium ethylene dicarbonate into lithium carbonate.

Proposed is a carbon dioxide and sulfur oxide capture and carbon resource conversion system for coal-fired power generation, the system being capable of capturing and converting carbon dioxide in an exhaust gas into a carbon resource by using a basic alkaline mixture solution, thereby being capable of reducing carbon dioxide and also capable of manufacturing sodium carbonate or sodium bicarbonate. In the system, sodium carbonate or sodium bicarbonate manufactured from the captured carbon dioxide is used as a desulfurization agent capturing sulfur oxide in an exhaust gas discharged from a coal-fired power generation plant, and carbon dioxide and sulfur oxide are simultaneously captured, so that an additional flue gas desulfurization equipment is not required to be mounted. Accordingly, the installation space of the desulfurization equipment for removing pollutants contained in gas introduced into carbon dioxide capture equipment may be minimized, and the process cost may be reduced.

The invention provides a multi-stage continuous crystallization method of high-purity large-granularity ellipsoidal baking soda crystals. The continuous crystallization comprises a reaction crystallization process, a first-stage cooling crystallization process and a second-stage cooling crystallization process which are continuously arranged; compared with intermittent crystallization, the continuous crystallization can improve the production efficiency of baking soda crystals, reduce the difference between batches and reduce the energy consumption; in addition, the baking soda crystal prepared by the continuous crystallization method is good in morphology and is in a monodisperse block shape; the particle size is uniform, and the average particle size is 300-450 microns; the flowability of the product is good, and the angle of repose is 25-35 degrees; the purity of the product is higher than 99.5%, impurities are few, and the quality standard of Chinese pharmacopoeia is met.

The invention relates to the technical field of saline-alkali ore development, and discloses a method for processing alkali and ammonium chloride from saline-alkali ore in a short process. The method comprises the following steps: filtering saline-alkali brine extracted from saline-alkali ores, reacting with carbon dioxide to generate sodium bicarbonate, crystallizing and separating out the sodium bicarbonate to form baking soda slurry, carrying out solid-liquid preliminary separation on the baking soda slurry, washing a separated baking soda wet filter cake with water, and calcining; sodium carbonate generated by decomposition is cooled and sieved, and the sieved lower-layer product is a qualified sodium carbonate product; ammonium bicarbonate and sodium chloride are subjected to a double decomposition reaction, ammonium chloride and sodium bicarbonate crystals are generated, ammonium chloride mother liquor obtained after sodium bicarbonate is separated is pumped to a rotary precipitation machine, sodium chloride powder is added, ammonium chloride crystals are separated out, ammonium chloride slurry is formed, the separated ammonium chloride crystals are dried, screened and packaged, and qualified ammonium chloride products are produced. According to the method, all salt and alkali with economic value in the salt and alkali brine are processed and utilized, and benefit development of the high-salt-content trona ore is achieved.

This invention discloses a method and system for recovering high-purity potassium bicarbonate and potassium sulfate from dust collected during blast furnace ferromanganese smelting. It proposes for the first time a technical route for recovering potassium bicarbonate and potassium sulfate by washing blast furnace ferromanganese smelting dust. Addressing the characteristics of the ash washing wastewater, pre-oxidation coupled with reduction impurity removal achieves efficient removal of sulfite and high-valence iron and manganese ions without introducing new impurities, significantly improving the purity of the recovered potassium salts. Secondly, considering the difficulty and cumbersome operation of separating carbonate, sulfate, and chloride ions, and taking into account the carbon dioxide consumption required for potassium bicarbonate preparation, the invention employs acid hydrolysis of carbonates to recover carbon dioxide, recycling carbon, and controlling the liquid-phase anion composition to co-produce high-purity potassium bicarbonate and potassium sulfate, reducing the cost of bicarbonate recovery and the difficulty of salt separation. Simultaneously, it achieves zero emissions of wastewater and waste gas.

The present invention provides a method for the comprehensive recycling and utilization of secondary aluminum ash and the co-production of high-purity hydrogen. In the method, the secondary aluminum ash is first pretreated with an ammonium chloride solution to hydrolyze aluminum nitride, aluminum carbide, and other substances in the aluminum ash, dissolving and recovering salts to increase process safety. The waste liquid is then recycled and reused multiple times through evaporation and crystallization to reduce carbon and recover salts, thereby increasing the utilization efficiency of the sodium element during the alkaline treatment process. The gas recovery and utilization during the aluminum ash hydrolysis process is then optimized, using the low-concentration ammonia water obtained through absorption to absorb carbon dioxide, and ammonium chloride is recycled and accumulated, avoiding the use of strong acid absorption and reducing equipment costs. Pressure swing adsorption is used to purify the gaseous components to the purity required for fuel cells. The method provided by the present invention reduces the high-temperature and corrosion resistance requirements of the equipment during the alkaline wet treatment of secondary aluminum ash, fully recovers the sodium element input during the alkaline treatment process and the soluble salts in the secondary aluminum ash, and achieves harmless treatment of the aluminum ash, with outstanding economic and environmental benefits.

A process for producing high purity lithium hydroxide monohydrate from a material containing a lithium salt selected from Li2SO4, LiCl, Li2CO3 or mixtures thereof, comprising membrane electrolysis of an aqueous solution of said lithium salt using a cation exchange membrane and nickel-plated stainless steel. The catholyte is drawn from the circulation stream and evaporated to obtain lithium hydroxide monohydrate crystals which are separated from the mother liquor, washed with water and dried to obtain the final high purity lithium hydroxide monohydrate. Part of the used wash liquor is fed to the catholyte evaporation process. Part of the mother liquor formed after separation of the lithium hydroxide monohydrate crystals is returned to the catholyte evaporation process. The reverse flow of the anolyte is replenished with a concentrated lithium salt solution prepared from the original lithium salt. Part of the used catholyte drawn from the evaporation process is directed to Li2CO3 production.

The present invention provides a method for producing high-purity alkali metal bicarbonates using a CO2-containing gas produced by the neutralization reaction of an acidic aqueous solution containing HF and / or HCl with calcium carbonate. [Solution] A method for producing an alkali metal bicarbonate, comprising: subjecting a first aqueous solution containing at least one acidic component selected from the group consisting of HF and HCl to calcium carbonate in a neutralization reaction to obtain a CO2-containing gas containing CO2 produced by the neutralization reaction; and performing a contact treatment in which the obtained CO2-containing gas is brought into contact with a second aqueous solution containing at least one alkali metal compound selected from the group consisting of alkali metal hydroxides and alkali metal carbonates to obtain an alkali metal bicarbonate.

A method for producing high purity lithium hydroxide monohydrate from materials containing a lithium salt selected from Li2SO4, LiCl, Li2CO3 or mixtures thereof, includes membrane electrolysis of an aqueous solution of the indicated lithium salt using a cation exchange membrane and a nickel-plated stainless steel cathode. The catholyte is withdrawn from the circulating stream and evaporated to give crystals of lithium hydroxide monohydrate, which are separated from the mother liquor, washed with water and dried to give the final high purity lithium hydroxide monohydrate. Part of the spent washing solution is fed into the catholyte evaporation process. Part of the mother liquor formed after the separation of crystals of lithium hydroxide monohydrate is returned to the catholyte evaporation process. The reverse flow of the anolyte is replenished with a concentrated lithium salt solution prepared from the original lithium salt. Part of the spent catholyte withdrawn from the evaporation process is directed to the production of Li2CO3.

The present invention provides a process for the synergistic resource treatment of waste electrolyte using waste aluminum alkali liquor, belonging to the field of wastewater treatment technology, comprising the following steps: mixing the waste electrolyte with the waste aluminum alkali liquor for reaction, filtering and separating to produce a first filter cake and a first filtrate, acid-washing the first filter cake, filtering to produce a second filter cake and a second filtrate, washing the second filter cake with water, filtering and purifying it, and then acid-leaching and slurrying it, filtering to produce a third filter cake and a third filtrate; washing the third filter cake with water, filtering and purifying it, and then drying it to produce AlF3; mixing the third filtrate with a water-soluble carbonate solution, filtering to produce a fourth filtrate and a fourth filter cake, and discharging the fourth filtrate into a storage tank for storage; washing the fourth filter cake with water, filtering and purifying it, and then drying it to produce Li2CO3. The present invention provides a process for the synergistic resource treatment of waste electrolyte using waste aluminum alkali liquor, utilizing the synergistic treatment of waste aluminum alkali liquor and waste electrolyte to simultaneously dispose of hazardous waste and produce resource products AlF3 and Li2CO3, thereby having good environmental and economic benefits.

The present invention relates to a plant (10) and process for capturing and recovering CO2 from reheat furnace fumes. Carbon dioxide is captured in a CO2 capture and separation unit (C) by membrane separation, adsorptive separation using PSA technology, or chemical absorption and gas regeneration, and split into two CO2 streams (F1, F2). One of the two streams (F1) is fed to a scrubbing device (18), where the CO2 passes through a solution of alkali metal hydroxides (MOH), particularly NaOH or KOH, to form M2CO3, which reacts with a second CO2 stream (F2) in a downstream reactor (24) to form alkali metal bicarbonate (MHCO3). Heat recovered from the fumes can be utilized in various parts / stages of the plant / process of the present invention.

The invention discloses a method for co-production of pseudo-boehmite and sodium bicarbonate. The method comprises the following steps: introducing a sodium metaaluminate aqueous solution through a liquid phase inlet of a gel forming reactor, introducing carbon dioxide through a gas phase inlet of the gel forming reactor, carrying out a reaction in the gel forming reactor, respectively discharging a gas phase and a solid-liquid mixed phase, separating the solid-liquid mixed phase through a solid-liquid separation device to obtain a solid phase, namely a pseudo-boehmite crude product, mixing a liquid phase obtained by separation with a gas phase discharged from the gel forming reactor in a mixing container to obtain a mixed material, introducing the mixed material into an electrodialysis membrane treatment device, concentrating the mixed material through the electrodialysis membrane treatment device to obtain a concentrated solution and a thin solution, introducing the concentrated solution into a reduced pressure distillation device, and performing reduced pressure distillation to obtain the pseudo-boehmite. A solid phase obtained after reduced pressure distillation is a sodium bicarbonate product.

The present invention provides a method for producing a carbonate or bicarbonate of an alkali metal, said method comprising supplying carbon-dioxide-containing bubbles, which are bubbles of a gas containing carbon dioxide, to an aqueous solution (a) of at least one alkali metal compound selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, and alkali metal chlorides. When the aqueous solution (a) is an aqueous solution of an alkali metal chloride, carbon dioxide-containing bubbles are supplied after ammonia has been supplied to the aqueous solution (a). The carbon dioxide-containing bubbles have a d50 size of 100 μm or less and a d90 size of 150 μm or less.

The invention provides a method and device for producing baking soda, and the method for producing baking soda comprises the following steps: adding a solid raw material (sodium bicarbonate and / or light ash) into a slurry tank, and mixing with filtrate from a filtrate barrel to obtain raw material slurry; the raw material slurry enters a heat recovery tower, and solids in the raw material slurry are dissolved under the high-temperature condition in the heat recovery tower. The dissolved solution enters a stripping tower, and the solid raw materials are completely dissolved in the stripping tower. The steam stripping liquid enters a carbonization tower and is subjected to a synthetic reaction with carbon dioxide to generate sodium bicarbonate solid. Carbonization liquid enters a thickener, part of clear liquid on the upper portion of the thickener enters a filtrate barrel, and crystal mush on the lower portion of the thickener is conveyed to a solid-liquid separator. And separating the crystal mush by a solid-liquid separator to obtain solid sodium bicarbonate crystals and filtrate, and feeding the solid sodium bicarbonate crystals to a drying process to obtain baking soda. According to the method, the sodium bicarbonate is directly used as the raw material, investment and operation of a calcination process and a clarification and filtration process are avoided, and the method has the advantages of low energy consumption and low production cost.

The invention discloses a method for recycling baking soda carbonization tail gas, and belongs to the technical field related to industrial tail gas treatment, the baking soda carbonization tail gas is recycled, is subjected to heat exchange and gas-liquid separation and then is fed into a first-stage carbonization tower for a first-stage carbonization reaction, an obtained first-stage outlet alkali liquid enters a second-stage carbonization tower for a second-stage carbonization reaction, and a second-stage outlet alkali liquid enters a third-stage carbonization tower for a second-stage carbonization reaction; and carrying out centrifugal separation and drying on the secondary outlet alkali liquor to obtain the baking soda. The baking soda carbonization tail gas is recycled and then used for preparing the baking soda product, the utilization rate of carbon dioxide is increased, and carbon emission is reduced; the purposes of optimizing the particle size distribution of the baking soda product, reducing the product hardening, prolonging the equipment operation cycle and improving the carbonization reaction conversion rate are achieved by adjusting the liquid inlet temperature of the second-stage carbonization tower, reducing the gas-liquid ratio, improving the gas inlet pressure, improving the liquid level in the carbonization tower and the like.

The invention relates to the field of trona ore treatment, and discloses a process for simultaneously producing various alkalis by utilizing high-salt-content trona ore. The carbonation process is combined with the low solubility of sodium bicarbonate, sodium bicarbonate in the saline-alkaline brine is separated out as a crystal, salt-alkali separation is achieved, sodium carbonate and sodium bicarbonate are produced, caustic soda is processed through high-salt-content brine subsequently, and sodium carbonate, sodium bicarbonate and caustic soda are produced through the saline-alkaline brine at the same time. And effective development of high-salt-content trona ore benefits is realized.

A process for producing high purity lithium hydroxide monohydrate from a material containing lithium salts selected from Li2SO4, LiCl, Li2CO3 or mixtures thereof, comprising membrane electrolysis of a specified aqueous lithium salt solution using a cation exchange membrane and a nickel-plated stainless steel cathode. Catholyte is withdrawn from the circulation stream, evaporated to obtain lithium hydroxide monohydrate crystals, which are separated from the mother liquor, washed with water and dried to obtain the final high purity lithium hydroxide monohydrate. A portion of the spent washing solution is fed to the catholyte evaporation process. A portion of the mother liquor formed after separation of the lithium hydroxide monohydrate crystals is returned to the catholyte evaporation process. The counterflowing anolyte is replenished with a concentrated lithium salt solution prepared from the original lithium salt. A portion of the spent catholyte withdrawn from the evaporation process is directed to the production of Li2CO3.

A continuous process for the production of sodium bicarbonate crystals from the carbon dioxide of a gas stream including an absorption step of the carbon dioxide from a gas stream into an aqueous solution including a sodium carbonate salt to produce an aqueous solution of sodium bicarbonate, then a crystallization step of the sodium bicarbonate salt obtained at the first step. A system for the production of sodium bicarbonate crystals from carbon dioxide of a gas stream including a control unit, an absorption unit and a crystallization unit.

The invention relates to a plant (10) and a process for the capture and recovery of CO2 from the fumes of a steel plant. The carbon dioxide is captured and divided in a CO2 capture and separation unit (C) into two CO2 flows (F1, F2) by means of membrane separation, adsorption separation, as with PSA technology, or chemical absorption and gas regeneration. One of the two flows (F1) feeds a washing device (18) wherein the CO2 passes through a solution of an alkali metal hydroxide MOH, in particular NaOH or KOH, to form M2CO3 which in a downstream reactor (24) is reacted with the second CO2 flow (F2) to form alkali metal bicarbonate (MHCO3). The heat recovered from the fumes can be utilized in various parts / stages of the plant / process of the invention.

This application relates to the field of carbon capture and utilization and saline wastewater recycling and treatment technology, specifically disclosing a carbon capture coupled with electrodialysis system for alkali production and sodium bicarbonate co-production in a coal-fired power plant. The main purpose is to achieve synergistic linkage between carbon capture, by-product salt resource utilization, and high-value product co-production, balancing environmental protection and economic benefits. The main technical solution of this application is as follows: the system includes a carbon capture unit, a bipolar membrane electrodialysis unit, and a carbonization co-production unit; the carbon capture unit is used to capture carbon dioxide from the flue gas of a coal-fired power plant and uses the waste heat of the power plant as a heat source for the carbon dioxide desorption process; the bipolar membrane electrodialysis unit is driven by green electricity and is used to electrolyze industrial sodium sulfate solution to generate sodium hydroxide solution and sulfuric acid solution; the carbonization co-production unit is connected to the carbon capture unit and the bipolar membrane electrodialysis unit, and is used to perform a directional carbonization reaction between the carbon dioxide and the sodium hydroxide solution to produce sodium bicarbonate.

The present invention relates to a method for producing a regenerated carbon material. Provided is a method for easily removing more Li from a carbon-based negative electrode active material containing Li to obtain a regenerated carbon material. This method for producing a regenerated carbon material comprises: a first heat treatment step in which a carbon-based negative electrode active material containing Li is heat-treated together with ethylene carbonate at a temperature less than the boiling point of ethylene carbonate to obtain a heat-treated product containing lithium ethylene dicarbonate; and a second heat treatment step for converting lithium ethylene dicarbonate into lithium carbonate by heat-treating the heat-treated product at a temperature equal to or higher than the boiling point of ethylene carbonate.

Disclosed are a system and a method for recycling carbon dioxide. A system for recycling carbon dioxide according to one aspect of the present invention comprises: a main reactor which is supplied with a first reaction solution in which a metal compound is dissolved and a first reaction gas containing carbon dioxide, and in which a reaction product in the form of a slurry and including a carbonate compound produced by a carbonation reaction between metal ions in the first reaction solution and carbon dioxide in the first reaction gas is produced; and a centrifuge for separating the reaction product discharged from the main reactor into a solid carbonate compound and a liquid.

This application provides a method for producing baking soda using staged cooling, comprising the following steps: S1, baking soda preparation, where baking soda is prepared by introducing carbon dioxide into a soda ash solution, and the prepared baking soda is dehydrated and dried to obtain powdered baking soda at a higher temperature; S2, primary cooling, where the baking soda obtained in step S1 is conveyed to a powder flow cooler for cooling and drying; S3, secondary cooling, where the baking soda that has undergone primary cooling is conveyed to a soda ash cooler for further cooling and drying. The staged cooling method for producing baking soda provided by this application significantly reduces the temperature and moisture content of the cooled baking soda, thereby extending the pseudo-caking period and improving the quality of the baking soda.

The present invention relates to a method for producing high-purity lithium carbonate by recovering lithium from scraps of a lithium ion secondary battery, and lithium carbonate produced thereby. The present invention may comprise: a step of roasting lithium ion secondary battery scrap powder in a reducing atmosphere; a step of wet-grinding; a step of water leaching while adding carbon dioxide; a step of removing impurities other than lithium by using an ion exchange resin; a step of synthesizing lithium carbonate by pyrolysis; and a step of obtaining solid lithium carbonate by filtering.