141results about "Carbonate preparation" patented technology

The invention belongs to the technical field of chemical engineering and secondary resource utilization, and particularly discloses a collaborative utilization process of sodium sulfate and ammonium-containing waste salt. The high-value utilization method of sodium sulfate provided by the invention comprises the following steps: mixing sodium sulfate, organic ammonium salt and sulfuric acid, and adding water to prepare a mixed solution; extracting the mixed solution by using an extracting agent, and separating a water phase from an organic phase; adding a pH regulator into the water phase to regulate the pH to alkalescence, introducing carbon dioxide gas to fully react, cooling, crystallizing, and filtering to obtain filtrate and sodium bicarbonate precipitate; heating the filtrate for evaporative crystallization to obtain ammonium sulfate; and recovering the organic acid in the organic phase. The invention provides a subversive solution for sodium sulfate by-product accumulation and ammonium-containing wastewater treatment, has double values of resource circulation and carbon emission reduction, and has the advantages of full-flow closed-loop design, wide applicability, high product purity and high economical efficiency in process.

The utility model discloses a system for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, which is characterized in that the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.

The invention relates to the technical field of chemical equipment, and discloses a sodium carbonate production system adopting an ammonia-soda process. The system for producing sodium carbonate by the ammonia-soda process comprises a thin liquid distillation tower and a flash evaporation module. The thin liquid distillation tower is used for discharging waste thin liquid; the flash evaporation module comprises a second flash evaporation device and a water injection assembly; a steam outlet of the second flash tank is communicated with a steam inlet of the thin liquid distillation tower; the water inlet end of the water injection assembly is communicated with the thin liquid distillation tower, and the water outlet end of the water injection assembly is located in the second flash tank and used for discharging waste thin liquid to flush flash steam in the second flash tank. According to the invention, by arranging the water injection assembly, the waste thin liquid discharged from the thin liquid distillation tower is introduced into the second flash tank for flushing flash steam in the second flash tank so as to flush away droplets in the flash steam, and the content of calcium ions introduced into the thin liquid distillation tower can be reduced, so that the calcium ions in the waste thin liquid are reduced and even eliminated; and the waste thin liquid discharged from the thin liquid distillation tower can be used as filtering washing water.

The present application relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, comprising the following steps: mixing industrial-grade liquid ammonia with deionized water to prepare ammonia water with a free ammonia concentration of 60-120 ti (ti is the abbreviation of titer, which is 1 / 20 mol / L), controlling the temperature of the mixing process to be less than or equal to 40 DEG C to avoid ammonia volatilization, pre-carbonizing by passing in CO2 under the conditions of 20-70 DEG C and a carbon dioxide pressure of 0.1-0.6 MPa, and adding sodium sulfate or a mixture of sodium bicarbonate and mirabilite to obtain a pre-carbonized liquid. The present application adopts an integrated process of pre-carbonization, clarification, carbonization, ammonia separation and low-temperature crystallization, and ammonia evaporation circulation, and can be operated continuously or intermittently, has low industrial implementation difficulty, strong running stability, separates ammonium sulfate by using ammonia separation and low-temperature crystallization technology, replaces the traditional evaporation and concentration process, combines material recycling design, and reduces the energy consumption per unit product compared with the traditional process.

The invention discloses a method for preparing large-particle sodium bicarbonate from sodium sulfate. The method comprises the following steps: pretreating raw materials; dynamically adjusting reaction conditions; establishing a raw material database; carrying out multistage continuous crystallization reaction; heat integration and waste heat recovery; the alkali medium is recycled; the temperature gradient design is simplified; double salt crystal separation and resource utilization, and bicarbonate radical concentration control; strengthening double salt separation by a membrane separation technology; and carrying out solid-liquid separation and product collection. In a sodium sulfate raw material dissolving stage, sodium carbonate or sodium bicarbonate is added to adjust the concentration of carbonate in a solution, so that the concentration is stabilized in a target range, ATR FT-IR is used for carrying out in-situ real-time quantitative analysis on carbonate ions in an aqueous solution, carbonate is automatically supplemented through feedback control, and the content of carbonate ions in the aqueous solution is determined. A plate heat exchanger is installed in a multi-stage reaction device, waste heat of previous-stage reaction liquid is utilized to preheat next-stage reaction liquid, and heat in mother liquor is recovered by adopting a vacuum evaporation technology in salting-out crystallization.

The present disclosure relates to new methods and processes of byproduct conversion, wastewater remediation, byproduct upcycling / recycling, and sustainable cyclic methods thereof.

This invention relates to the field of terephthalic acid oxidation residue technology, specifically a high-efficiency treatment method for terephthalic acid oxidation residue, comprising the following steps: S1. Pretreatment; S2. Separation; S3. Evaporation and concentration; S4. Incineration; S5. Ash dissolution; S6. Filtration; S7. Sodium carbonate recovery; S8. Sodium carbonate recycling; S9. Bromine recovery and utilization; S10. Cobalt-manganese catalyst recovery; S11. Precipitate treatment; S12. Cobalt-manganese catalyst recycling. This application utilizes the waste heat or residual heat from the top of the xylene oxidation unit as a heat source to heat and concentrate the first filtrate. The acetic acid flash evaporator in the crystallizer serves as the heat source for evaporator V3 to evaporate and concentrate sodium carbonate, reducing process energy consumption and improving sodium carbonate recovery efficiency. The incineration unit heats the furnace body through external and internal incineration components, achieving efficient incineration of the material, greatly increasing the material's heating efficiency, and improving incineration efficiency and energy utilization.

The invention relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, which comprises the following steps: mixing industrial liquid ammonia with deionized water to prepare ammonia water with the free ammonia concentration of 60-120ti (ti titer abbreviation, namely 1 / 20mol / L), and controlling the temperature to be less than or equal to 40 DEG C in the mixing process to avoid ammonia volatilization, cO2 is introduced for pre-carbonization under the conditions that the temperature is 20-70 DEG C and the pressure of carbon dioxide is 0.1-0.6 MPa, sodium sulfate or a mixture of mirabilite and sodium bicarbonate is added, and a pre-carbonization solution is obtained; the process adopts an integrated process of pre-carbonization, clarification, carbonization, ammoniation low-temperature crystallization and ammonia distillation circulation, can be continuously or intermittently operated, is low in industrial implementation difficulty and high in operation stability, separates ammonium sulfate through an ammoniation and low-temperature crystallization synergistic technology, replaces a traditional evaporation and concentration process, is combined with a material cyclic utilization design, and has a good industrial application prospect. The unit product energy consumption is reduced compared with the traditional process.

The invention belongs to the technical field of mirabilite resource utilization, and particularly relates to a mirabilite resource utilization method based on micro-nano bubble enhanced mass transfer. The method comprises the following steps: (1) dissolving mirabilite solid waste with water or carrying out concentration treatment on mirabilite waste water to enable the concentration of sodium sulfate to be close to a saturated state so as to obtain a mirabilite solution; (2) firstly introducing ammonia gas in a micro-nano bubble form into the mirabilite solution in the step (1) to form a sodium sulfate solution system rich in dissolved ammonia, and then continuously introducing carbon dioxide in the micro-nano bubble form to carry out a crystallization precipitation reaction; (3) carrying out solid-liquid separation on the reaction material in the step (2), and washing and drying the solid phase to obtain a sodium bicarbonate product; adding sulfuric acid into the liquid phase to react to convert the dissolved sodium bicarbonate into sodium sulfate, then performing concentration-crystallization treatment on the solution to obtain an ammonium sulfate crystal product, and recycling the residual mother liquor in the step (1). According to the method, a high-purity sodium bicarbonate product and a high-purity ammonium sulfate product can be simultaneously obtained through a simple process.

The present invention efficiently produces a carbonate salt from a carbon dioxide gas in an exhaust gas. This production method for a carbonate salt comprises: an atomizing step wherein an aqueous alkali solution is formed into a mist by an atomizer; a mixing step wherein the mist of the aqueous alkali solution obtained in the atomizing step is mixed with an exhaust gas so as to have a carbon dioxide gas in the exhaust gas absorbed in the mist and to form a carbonate salt by bonding positive ions of the mist and the carbon dioxide gas with each other, thereby having the mist contain the carbonate salt; and a separation step wherein the mist containing the carbonate salt obtained in the mixing step is separated from the exhaust gas.

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 CO2 collection system is configured to collect CO2 by bringing CO2-containing gas into contact with a reaction liquid containing NaOH and stored in a reaction tank to produce a target product. The target product to be extracted from the reaction liquid is adjusted according to a maximum temperature of the reaction liquid after production of NaHCO3 in the reaction liquid, an extraction temperature that is a temperature of the reaction liquid when the target product is extracted from the reaction tank, and an initial concentration of the NaOH in the reaction liquid.

A CO2 recovery device (1) comprises a reaction tank (10), a CO2 gas supplying unit (41), and a CO2 removed gas emitting unit (42). The reaction tank (10) brings CO2 gas into contact with an aqueous alkali metal hydroxide solution or an aqueous alkaline earth metal hydroxide solution. The CO2 gas supplying unit (41) supplies the CO2 gas into the reaction tank (10). The CO2 removed gas emitting unit (42) emits CO2 removed gas, being gas from which CO2 has been removed, from the reaction tank (10). The CO2 gas supplying unit (41) and the CO2 removed gas emitting unit (42) are detachably attached to the reaction tank (10).

The invention belongs to the field of inorganic chemical industry, and particularly relates to a potassium carbonate production technology, in particular to a method for purifying a copper ion-containing pesticide synthesis byproduct potassium chloride and directly using the copper ion-containing pesticide synthesis byproduct potassium chloride to produce potassium carbonate. The method comprises the following steps: purifying a byproduct potassium chloride to obtain a refined byproduct potassium chloride solution V; conveying the refined byproduct potassium chloride solution V into a cation exchange resin bed, and carrying out ion exchange to respectively obtain a potassium bicarbonate solution and an ammonium chloride solution; the potassium bicarbonate solution and the ammonium chloride solution are subjected to evaporation, concentration, crystallization and centrifugal separation respectively, so that a potassium bicarbonate wet product and an ammonium chloride wet product are correspondingly obtained respectively; and calcining the potassium bicarbonate wet product at high temperature to obtain potassium carbonate. The method has the technical advantages of being low in energy consumption, free of waste water, free of newly-added pollutants and impurities and the like.

To provide a method and system for producing calcium carbonate that can produce high purity calcium carbonate using calcium-containing waste.SOLUTION: A calcium carbonate production method for producing calcium carbonate from calcium-containing waste comprises a calcium dissolution step in which calcium is dissolved by adding hydrochloric acid water to the calcium-containing waste to produce an aqueous solution containing calcium ions, a separation step in which the hydrogen ion concentration index of the aqueous solution containing calcium ions is adjusted to separate, from the aqueous solution, components containing at least one component selected from the group consisting of Si, Al, Mg, and heavy metals, and a calcium carbonate recovery step in which calcium carbonate is produced using the aqueous solution obtained through the separation step and the aqueous solution containing potassium carbonate and / or sodium carbonate.SELECTED DRAWING: Figure 1

The invention relates to the technical field of environmental protection, in particular to application of an ethylene waste alkali solution to preparation of sodium carbonate, the ethylene waste alkali solution is used as a raw material, and an ethylene waste alkali solution treatment device is used for preparing a sodium carbonate product with the purity of 99% or above. The method comprises the following steps: providing a sodium sulfate solution through a sodium sulfate supply device by taking ethylene waste alkali liquor as a raw material; according to the method, sodium ion exchange resin is used as a raw material, an ammonium bicarbonate solution and a sodium chloride solution are supplemented into the sodium ion exchange resin at the same time, the ethylene waste alkali liquid is used as the raw material, and NH4HCO3, NaCl and Na2SO4 are input at the same time when Na < + > ions in the sodium ion exchange resin are insufficient, so that exchange of the Na < + > ions and the NH4 < + > ions is accelerated, and sodium carbonate with the purity being 99% or above is prepared. The problems that in the prior art, sodium carbonate prepared by taking ethylene waste alkali liquor as a raw material contains sodium sulfate and the purity of sodium carbonate is not high are solved.

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.

The invention relates to the technical field of melamine, and discloses a method and a system for producing sodium carbonate and liquid ammonia by using melamine tail gas, the production method comprises the following steps: reacting the melamine tail gas with a caustic soda solution in a reactor to form solid-containing slurry and residual gas; wherein the temperature of the reaction ranges from 100 DEG C to 250 DEG C, and the pressure of the reaction ranges from 0.1 MPa to 0.6 MPa; sequentially carrying out flash evaporation and solid-liquid separation on the solid-containing slurry, and drying the obtained solid to obtain a sodium carbonate product; and condensing and rectifying the residual gas in sequence to obtain a liquid ammonia product. By utilizing the characteristic that the solubility of carbon dioxide and ammonia in the melamine tail gas in alkali liquor is different, the complete separation of ammonia and carbon dioxide is realized, the carbon dioxide and caustic soda generate sodium carbonate, and the economic benefit of the product is increased; meanwhile, almost no waste residue exists, and the energy consumption is low.

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.

The present invention relates to a plant and method for the purification of fumes from industrial discharges and / or for the recovery and reconversion of sulfur oxides and / or nitrogen oxides and / or carbon dioxide contained in said fumes. Said method comprises the passage into one or more aqueous solutions, where said aqueous solutions are selected from the group comprising: —solution with an acid pH, between 0.5-1; —solution at a pH between 3 and 5, at about pH 4; —Ca(OH)2 or CaCl2 or calcium acetate solution; —solution at a pH between 8 and 9.

Provided is a method for producing a lithium carbonate from a basic lithium- and aluminum-containing waste liquid generated during a positive electrode material production process, the method comprising the steps of: (a) filtering the waste liquid to remove metal solids; (b) injecting carbon dioxide into the waste liquid removed of the metal solids, thereby converting a lithium hydroxide into a lithium bicarbonate; (c) adding an anion exchange resin to the lithium bicarbonate-containing waste liquid to convert a lithium sulfate into a lithium hydroxide; (d) injecting carbon dioxide into the lithium hydroxide-containing waste liquid to convert the lithium hydroxide into a lithium carbonate; and (e) concentrating the lithium carbonate-containing waste liquid using an evaporator and then recovering a solid lithium carbonate.

The present specification discloses a method for producing a concentrated carbonate aqueous solution. The present invention relates to a method for producing a concentrated carbonate aqueous solution, comprising a step of dewatering an aqueous solution of hydrogen carbonate with a salt blocking film to produce a concentrated aqueous solution of hydrogen carbonate, wherein the concentrated aqueous solution of hydrogen carbonate obtained in the above step is heated to thermally decompose the hydrogen carbonate into a carbonate, carbon dioxide, and water, and water is evaporated to obtain a concentrate of the carbonate aqueous solution.

This invention relates to a method for recovering ammonium components during the production of sodium bicarbonate from sodium sulfate, belonging to the field of chemical production technology. The recovery method includes: pretreating a crystallization mother liquor containing sodium sulfate, ammonium sulfate, ammonium bicarbonate, and diammonium carbonate, then mixing it with sodium sulfate and crystallizing to obtain a liquid-solid mixture; separating fine particles from coarse crystals in the liquid-solid mixture to obtain a coarse crystal slurry and a slurry containing fine particles, respectively; performing solid-liquid separation on the obtained coarse crystal slurry to obtain a double salt and a filtrate; and mixing the obtained double salt with a solution for washing to obtain solid sodium sulfate and a solution of ammonium sulfate. The recovery method provided by this invention has advantages such as a short process flow, simple operation, and no environmental pollution risk. This method not only avoids high-temperature ammonia stripping and low-temperature freezing processes, reducing investment and operating costs and energy consumption, but also improves the ammonia recovery rate and enhances raw material utilization efficiency.

Process for producing ammonium carbonate ((NH4)2CO3) and sodium carbonate (Na2CO3) in an electrolyzer comprising an hydrogen depolarized anode, by feeding a base chamber of the electrolyzer with an aqueous solution comprising ammonium chloride (NH4Cl), sodium chloride (NaCl), dissolved carbon dioxide (CO2) and obtaining an outlet solution from the base chamber comprising ammonium carbonate ((NH4)2CO3) and sodium carbonate (Na2CO3).

The present application relates to the technical field of natural soda production, and in particular to a system and method for preparing heavy soda ash by using cogeneration coupled with wind power supply. The system for preparing heavy soda ash by using cogeneration coupled with wind power supply comprises a coal-fired cogeneration device, a wind power generation device and a heavy soda ash production system. The coal-fired cogeneration device is used to provide steam and electric energy. The wind power generation device is used to provide electric energy. The heavy soda ash production system uses the steam and electric energy provided by the coal-fired cogeneration device and the electric energy provided by the wind power generation device to produce heavy soda ash. The present application can solve the technical problems of large energy consumption and large carbon emissions in the existing natural soda production.

The application discloses a raw material gas integrated supply system for potassium carbonate production and a potassium carbonate production system. The system directly uses high-purity carbon dioxide tail gas of synthetic ammonia as a main carbon source, and simultaneously provides carbon dioxide and heat energy after combustion of the resolved gas, thereby greatly reducing natural gas consumption and realizing energy saving and consumption reduction. Through three independently controllable gas source channels, according to natural gas supply and market price, modes such as full use of by-product gas, switching to natural gas or optimal mixing of multiple gas sources can be flexibly selected, thereby significantly enhancing the adaptability and risk resistance of the device. According to different gas source pressures and properties, the system is provided with a buffer tank for stabilizing pressure, a vent valve for ensuring pipeline safety, a check valve for preventing gas mutual channeling and a special combustion furnace for ensuring complete combustion, so that the safe and stable operation of the system is ensured. The system converts the by-product gas of synthetic ammonia into potassium carbonate raw materials, realizes carbon resource recycling, reduces direct carbon dioxide emission and conforms to the green and low-carbon development direction.

Crystallizer devices and methods of direct air capture of carbon dioxide are described herein. The methods include providing one or more polymeric strands in contact with an alkaline capture solution. Each of the polymeric strands is comprised of a plurality of polymeric fibers that combine to form an outer surface of the polymeric strand. The outer surface of the strand forms a crystallizing surface. The alkaline capture solution travels by way of capillary force from the outer surface of the strand inwardly through intra-strand pores and from a first end of the strand in a direction towards a second end of the strand through intra-strand pores. The methods also include, as the alkaline solution travels towards the second end, contacting the one or more polymeric strands with ambient air such that KOH within the alkaline solution reacts with CO2 to form K2CO3 precipitate at the crystallizing surface.

The invention discloses a method and a system for processing heavy soda ash by utilizing nuclear energy combined heat and power generation energy supply, and relates to the technical field of trona production. The method comprises the following steps: pretreating brine to obtain refined brine; carrying out steam stripping decomposition on the refined brine by using nuclear energy combined heat and power generation steam to obtain concentrated brine with Na2CO3 as a main component; the method comprises the following steps: carrying out multiple-effect evaporation on concentrated brine of which the main component is Na2CO3 by using nuclear energy combined heat and power generation steam, wherein Na2CO3 is separated out in a monohydrate sodium carbonate Na2CO3.H2O crystal form; carrying out centrifugal drying treatment on the monohydrate alkali crystal and the mother liquor by utilizing nuclear energy combined heat and power generation electric energy; and calcining the dried material by using nuclear energy combined heat and power generation steam to remove crystal water in the dried material, thereby obtaining the heavy sodium carbonate Na2CO3. According to the invention, the steam production quantity of the nuclear reactor is increased, and the steam power generation quantity of the nuclear reactor is correspondingly reduced, so that a large amount of energy loss generated when low-grade energy is converted into high-grade energy is reduced, and the overall efficiency is improved.

Methods of forming a soil amendment include: (a) providing a carbon dioxide source; (b) adsorbing carbon dioxide from the carbon dioxide source with sodium oxide of sodium bentonite clay to form sodium carbonate; (c) reacting the sodium carbonate with an olivine magnesium silicate to consume the sodium carbonate and form magnesium carbonate and sodium silicate; (d) reacting the sodium silicate with carbon dioxide to consume the sodium silicate, re-form sodium carbonate, and form silicon dioxide; and (e) forming the soil amendment by combining the generated magnesium carbonate and the silicon dioxide. Steps (c) and (d) continue in a continuous fashion until the olivine magnesium silicate is consumed. A soil amendment formed according to these methods is also described.