36results 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 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 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.

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.

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 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.

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 utility model relates to the technical field of energy-saving heavy soda ash production equipment, and discloses energy-saving heavy soda ash production equipment which comprises an alkali dissolving barrel, one side of the alkali dissolving barrel is connected with a heavy alkali liquor pump, one end, far away from the alkali dissolving barrel, of the heavy alkali liquor pump is connected with a wet decomposition tower, the bottom end of one side, far away from the alkali dissolving barrel, of the wet decomposition tower is connected with a decomposition liquid pump, and the decomposition liquid pump is connected with a water pump. The other end of the decomposition liquid pump is connected with an alkali liquor buffer tank, the end, away from the decomposition liquid pump, of the alkali liquor buffer tank is connected with an alkali liquor pump, the end, away from the alkali liquor pump, of the alkali liquor buffer tank is connected with a mother liquor barrel, the end, away from the alkali liquor pump, of the mother liquor barrel is connected with a mother liquor pump, and the other end of the mother liquor pump is connected with a hydration crystallizer. The high-quality heavy ash calcining furnace has the advantages that the steam consumption in the heavy soda ash production process is reduced, the soda ash production cost is reduced, and the market competitiveness of soda ash products is improved.

Metal carbonate (M(CO3) x ) to metal bicarbonate (M(HCO3) y A continuous process for at least partially converting to ), comprising supplying a composition containing a metal carbonate and a composition containing water to a reactor to form a mixture of water and metal carbonate, and optionally adding a water / metal salt solution, wherein the reactor is supplied with a gas containing carbon dioxide (CO2) under high pressure.

This invention provides a method for producing high-purity alkali metal bicarbonates using combustion exhaust gas. [Solution] A method for producing an alkali metal bicarbonate, comprising subjecting combustion exhaust gas containing at least one acidic component selected from the group consisting of HF, HCl, and SO2, and CO2, to a preliminary treatment to remove at least a portion of the acidic component to obtain a preliminary treatment exhaust gas, and then performing a contact treatment in which the preliminary treatment exhaust gas is brought into contact with an aqueous solution (a) 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.

The present disclosure relates to a method for producing sodium bicarbonate and gypsum using sodium sulfate.

The invention belongs to the technical field of trona ore production, and discloses a trona ore production system and a production process thereof. The system is provided with three lines for simultaneously producing sodium carbonate, baking soda and ammonium chloride, and comprises a carbonation tower a which is sequentially connected with a centrifugal machine a, a calcining furnace and a sodium carbonate packaging machine, and another line of the carbonation tower a is sequentially connected with an MVR evaporator, an ammonia absorption tower, a carbonation tower b, a centrifugal machine b, a fluidized bed dryer a and a baking soda packaging machine; another line of the centrifugal machine b is sequentially connected with a rotary precipitation machine, a fluidized bed dryer b and an ammonium chloride packaging machine. The method realizes simultaneous production of sodium carbonate, baking soda and ammonium chloride from the saline-alkaline brine, and realizes benefit development of the high-salt-content trona ore by processing and utilizing all saline and alkaline with economic values in the saline-alkaline brine.

A carbon dioxide capture and carbon resource utilization system, for a fuel cell, using boil-off gas (BOG) generated from liquefied natural gas (LNG) of the present invention comprises: a liquefied natural gas storage which stores liquefied natural gas therein; a hydrocarbon reformer which generates a gas mixture containing hydrogen and carbon dioxide by reacting boil-off gas generated from the liquefied natural gas storage with water introduced from the outside; a fuel cell which receives hydrogen generated from the hydrocarbon reformer to generate electric power; a reactor which receives carbon dioxide generated from the hydrocarbon reformer to react the carbon dioxide with a basic alkali mixture solution, thereby capturing carbon dioxide, collects a reaction product containing the captured carbon dioxide, and separates a carbon dioxide reaction product and a waste solution from the reaction product; and a hydrogen generator which generates hydrogen by using the carbon dioxide reaction product separated from the reactor and supplies the generated hydrogen to the fuel cell.

To provide a method for easily obtaining a regenerated carbon material by removing more Li from a carbon-based negative electrode active material containing Li.SOLUTION: The method for producing a regenerated carbon material of the present disclosure includes a first heat-treatment step of heat-treating a carbon-based negative electrode active material containing Li together with ethylene carbonate at a temperature lower than the boiling point of ethylene carbonate to obtain a heat-treated product containing lithium ethylene dicarbonate, and a second heat-treatment step of heat-treating the heat-treated product at a temperature equal to or higher than the boiling point of ethylene carbonate to convert lithium ethylene dicarbonate to lithium carbonate.SELECTED DRAWING: Figure 1

The utility model discloses a dry-method sodium-based desulfurization ash recycling system which comprises a desulfurization ash storage hopper, a water adding pipeline, a mixing pool, a first-stage reaction kettle, a hydrochloric acid dosing pipeline, a second-stage reaction kettle, a suction filter, an evaporation dryer, a wind type dryer, a sodium bicarbonate storage tank, a first heat exchanger, a nitrogen fertilizer storage tank, a second heat exchanger and an ammonium bicarbonate pipeline, an outlet of the desulfurization ash storage hopper is connected with a feeding port pipeline of the mixing pool, a water adding pipeline is connected with a water adding port of the mixing pool, an outlet of the mixing pool is connected with an inlet pipeline of the first-stage reaction kettle through the first-stage lifting pump, and an additive inlet of the first-stage reaction kettle is connected with a hydrochloric acid adding pipeline; an outlet of the first-stage reaction kettle is connected with an inlet pipeline of the second-stage reaction kettle, an additive inlet of the second-stage reaction kettle is connected with an ammonium bicarbonate pipeline, a lower-layer filtrate outlet of the second-stage reaction kettle is connected with an inlet pipeline of the first-stage reaction kettle through the second-stage lifting pump, and an upper-layer filtrate outlet of the second-stage reaction kettle is connected with an inlet pipeline of the suction filtration machine.

The invention provides an enzymatic carbon dioxide capture process, where carbon dioxide is converted to, and precipitated as, sodium bicarbonate.

A carbon dioxide capture, carbon resource utilization, and hydrogen production system for a steel mill of the present invention comprises: a reactor which is provided between a reduction furnace and a blast furnace to spray a basic alkali mixture solution from a reduction gas, a flue gas of the reduction furnace, to remove carbon dioxide and produce a reaction product, and then blows the carbon dioxide-removed flue gas into the blast furnace; and a hydrogen generator which generates hydrogen gas and oxygen gas, by using a carbon dioxide reaction product, from the reaction product generated from the reactor, and supplies the generated hydrogen gas as fuel to the blast furnace and supplies the generated oxygen gas to a melter-gasifier, wherein the reactor separates the carbon dioxide reaction product and a waste solution from the reaction product and stores the separated carbon dioxide reaction product for resource utilization thereof.

The present disclosure provides a method for extracting potassium bicarbonate from a mineral mixture. The method includes combining potassium chloride, sodium bicarbonate, and magnesium carbonate trihydrate in an aqueous solution. The aqueous solution is cooled to form Engel's salt comprising potassium bicarbonate magnesium carbonate tetrahydrate. Engel's salt is separated from the aqueous solution and leached with water to produce an aqueous potassium bicarbonate solution and magnesium carbonate trihydrate. The method may further include recycling at least a portion of the magnesium carbonate trihydrate produced from leaching Engel's salt back into the aqueous solution. The aqueous potassium bicarbonate solution can be processed to produce various potassium bicarbonate products.

A continuous process for the at least partial conversion of a metal carbonate (M(CO3)x) to a metal bicarbonate (M(HCO3)y), comprising:feeding a composition comprising a metal carbonate and a composition comprising water into a reactor to form an admixture of water and metal carbonate;optionally adding water / a solution of a metal salt;wherein the reactor is fed with a gas comprising carbon dioxide (CO2) under elevated pressure.

The present invention provides a bicarbonate production method suitable for producing a high purity bicarbonate while suppressing loss of carbon dioxide. The bicarbonate production method includes a generation step of generating a bicarbonate by using a mixed gas that contains carbon dioxide, and a concentration of the carbon dioxide in the mixed gas is 30 volume% or more and 95 volume% or less in a standard state.