97results about "Alkali metal carbonates shape formation" patented technology

A process for formulating high purity potassium chloride from a carnallite source. The process takes advantage of solubility differences and saturation levels in a multiple salt system generated upon dissolution of carnallite. In the system, the sodium chloride is kept in solution and the magnesium chloride present in the system is controlled to be in a concentration range of between 12% and 25% by weight. This avoids co-precipitation of sodium chloride with the potassium chloride during crystallization and therefore prevents the sodium chloride from contaminating the potassium chloride. The result is high grade potassium chloride.

The present invention discloses a method for quickly extracting lithium carbonate from saline lake water and a system for the same. The method comprises: first quick-freezing the saline lake water to obtain lithium-rich brine, then evaporating under reduced pressure to enable lithium carbonate to be rapidly precipitated out. The method has advantages of short process flow and less labor consumption, thereby enabling continuous automatic operation, high energy utilization and environment-friendly. Further, the crystallization rate is several times faster than that of the salt-pan process and the grade of lithium carbonate salt mine obtained can reach 95% or more, therefore the method of the present invention is particularly suitable for industrial production in the remote saline lake region. The system comprises a reduced-pressure evaporation crystallizer, a vacuum-pumping apparatus, a brine preheating apparatus and a brine cooling apparatus, which concentrates the brine by quick-evaporation of the water, promotes lithium carbonate to form non-uniform nucleus, and improves the crystallization efficiency.

The invention provides a wastewater treatment system and evaporative-crystallization salt making equipment for treating high-salt organic wastewater. The evaporative-crystallization salt making equipment comprises a flash tank; the flash tank is provided with a first circulating water inlet and a circulating water outlet which is arranged below the first circulating water inlet; the circulating water outlet is connected with the first circulating water inlet by a circulating pipe; and the circulating pipe is provided with a heating device. The evaporative-crystallization salt making equipment further comprises a salt washing leg, and the salt washing leg is connected with and penetrates through the bottom of the flash tank and comprises an upper water inlet, a middle water inlet and a salt outlet, wherein the upper water inlet is arranged in the salt washing leg, the water inlet direction of the upper water inlet is downward, the middle water inlet is arranged below the upper water inlet and is designed to enable the wastewater in the salt washing leg to generate rotational flow, and the salt outlet is arranged below the middle water inlet. The wastewater treatment system and the evaporative-crystallization salt making equipment can be used for washing the crystalloid salt particles repeatedly under the condition that the crystalloid salt particles are mixed with the wastewater, are simple in structure, low in cost, high in wastewater treatment efficiency and can ensure that the obtained crystalloid salt particles have high purity.

The invention relates to a PTA incineration boiler ash residue solution salt separation crystallization process, and belongs to the technical field of evaporative crystallization. The process comprises the following steps of: dissolving ash of the PTA incineration boiler with waste heat into a nearly saturated solution of sodium carbonate and sodium bromide, and removing metals and other insoluble substances from the solution by adopting a metal sintering filter, separating the obtained filtrate by adopting an evaporative crystallization method to obtain sodium carbonate monohydrate crystals, removing sodium carbonate from the mother liquor by adopting a replacement method, and then separating by adopting an evaporative crystallization method to obtain sodium bromide crystals. Sodium carbonate and sodium bromide in the PTA boiler ash are separated and recovered by adopting an evaporative crystallization method, the process flow is simple, the operation conditions are simple, convenient and stable, and industrialization is facilitated; the high-purity sodium carbonate and sodium bromide recovered by the method can meet the quality requirements of industrial-grade products and can be directly recovered and reused or sold as by-products, so that the purpose of treating waste residues and wastewater is achieved, the requirements of the current environmental protection situation are met, waste can be turned into wealth, recycling of salt is realized, and the benefits of factories are improved.

The invention relates to a carbonization crystallization technology in the process for producing sodium carbonate through a Hou's method. The technology is characterized in that the technology comprises the following steps: sending an ammonia II mother solution to a carbonization cleaning tower, and countercurrent-contacting and reacting with a cleaning gas output by a sodium carbonate preparation tower to precarbonize; injecting a precarbonization solution to a cleaning pump connected to the carbonization cleaning tower to clean the cycle of the carbonization cleaning tower; sending the precarbonization solution taken from the bottom of the carbonization cleaning tower to a primary crystallizer, cooling the precarbonization solution by allowing it to go through a primary cooler, allowingit to go through a collection tank and then return to the primary crystallizer, sending the generated crystal slurry to a primary thickener by the primary crystallizer to thick, and centrifuging; sending the obtained overflow solution to the soda preparation tower, and countercurrent-contacting and reacting with a transformation gas to prepare soda; sending the solution from the soda preparation tower to a secondary crystallizer, crystallizing again, thickening again, and separating again; and sending parts of the overflow solution to the soda preparation tower, and contacting with the transformation gas to carry out cycle soda preparation. The technology of the invention, which adopts above two-time carbonization two-time crystallization external-cooling process, allows the crystallization residence time of the carbonization tower to be prolonged, the carbonization conversion rate to be improved, the working time of the carbonization tower to be prolonged and the production capacity of the carbonization tower to be increased.

Methods of forming potassium sulfate include calcining polyhalite ore particles to convert the polyhalite ore particles to a water-soluble composition. At least a portion of the water-soluble composition is dissolved in an aqueous medium to form an aqueous solution comprising K+, Mg2+, and SO42− ions and a calcium-containing solid. The calcium-containing solid is separated from the aqueous solution to form a filtrate comprising K+, Mg2+, and SO42− ions. A potassium-containing salt is dissolved in the filtrate to increase the concentration of K+ and SO42− ions to from a concentrated liquor, and K2SO4 is crystallized from the concentrated liquor. A system for processing polyhalite ore includes a countercurrent leaching apparatus, a first mix tank, an evaporator, and at least one crystallizer.

The invention discloses sodium bicarbonate crystal preparation equipment and a process for preparing sodium bicarbonate crystals by utilizing the same. The equipment comprises a carbonizer, wherein a tail gas absorption section is arranged at the top of the carbonizer; the part (below the tail gas absorption section) is divided into a first reaction zone, a second reaction zone and a third reaction zone in sequence; and a plurality of ring-shaped tower plates are arranged in each reaction zone. The process is characterized by comprising the following steps: firstly carrying out first-step carbonization and crystallization, then carrying out crystal-slurry separation on reaction solution and enabling the product to leave from the carbonizer and pass through an ammoniating apparatus for ammoniating so that sodium bicarbonate enters an unsaturated zone; then cooling with water and finally sending sodium bicarbonate back to the carbonizer for further carbonization and crystallization. Therefore, the problem of water cooler scabbing is solved, no standby coolers are needed for alternate operation, the prepared sodium bicarbonate crystals have good crystal form, big particles and low moisture content and the energy consumption of the subsequent calcining procedure is also obviously reduced.

A new process for recovery of Low Sodium Salt from bittern has been described in the present invention, the said process comprising desulphatation of bittern (by-product of salt industry), evaporation of bittern in solar pans and processing of solid mixture with water to produce a mixture of sodium and potassium chlorides and optionally preparing “free flowing” and iodized, by known techniques.

An apparatus for crystallization, which contains a crystallization vessel, a seed supplying device, a feed solution supplying device and a tube baffle disposed within the crystallization vessel. The tube baffle is provided with a crystallization portion in an inner area and a lower area thereof, and the tube baffle and the crystallization vessel define a classification portion there between. The apparatus further contains an agitating fan for agitating the seed crystals and the feed solution, and a plurality of plate baffles disposed within the classification portion which define a buffer portion and a gravitational settling portion. The apparatus further contains a device for generating a rising velocity of a slurry containing fine crystals in the gravitational settling portion by discharging the slurry so that the rising velocity of the slurry is greater than a settling velocity of the fine crystals and an outlet for discharging the crystallized material.

The invention provides carbonation and crystallization equipment, application thereof and a preparation method for sodium bicarbonate, and relates to the field of chemical equipment. The carbonation and crystallization equipment comprises a crystallization barrel and a carbonization reactor, the carbonization reactor is arranged outside the crystallization barrel and is communicated with the crystallization barrel, and reaction final liquid in the carbonization reactor can enter the crystallization barrel for crystallization treatment. The carbonation nad crystallization equipment has the advantages that the technical problems that an existing carbonation tower is low in production efficiency and large in energy loss due to cleaning can be solved, and the technical effects that the operation efficiency and the production efficiency of the equipment are improved, and the energy consumption is reduced can be achieved.

The invention relates to a preparation method of large-particle heavy baking soda. The method comprises the following steps: performing a carbonization reaction on a sodium carbonate solution or a mixed solution of sodium carbonate and sodium bicarbonate and CO2, so as to obtain a mixture; and adding sodium carbonate and / or a solid and / or a solution of a mixture of sodium carbonate and sodium bicarbonate into the obtained mixture for crystallization and solid-liquid separation, so as to obtain the large-particle heavy baking soda. The sodium carbonate solution or the mixed solution of sodium carbonate and sodium bicarbonate can be prepared from heavy alkali in soda production. The preparation method is suitable for different baking soda manufacturing plants; and the baking soda is high inyield and large in particle size.

The process of the invention is an improvement over the existing process of producing salt of high purity from alum-treated brine disclosed recently in the prior art. More particularly, the invention rectifies the ratio of Ca2+ to Mg2+ from a value <1 to a value in the range of 2-3 desired by chlor-alkali and soda ash industries. The improved process involves the adjustment of pH of clarified brine with aqueous HCl so as to carry out salt crystallization at a pH of 6.5 instead of at the natural pH of 7. The pH adjustment reduces the Mg2+ impurity in salt while slightly raising the Ca2+ impurity in the salt and thereby achieving the desired ratio.

A process for producing crystalline sodium bicarbonate, comprising: providing an aqueous sodium-bicarbonate containing liquor originating from a reactive crystallization step in which first sodium bicarbonate crystals are produced and recovered; feeding at least a portion of said aqueous sodium-bicarbonate containing liquor to a cooling crystallization unit to form second sodium bicarbonate crystals and produce a crystals slurry comprising the second sodium bicarbonate crystals; and withdrawing a portion of the crystals slurry from the cooling crystallization unit for the withdrawn second sodium bicarbonate crystals to be further processed. A portion of the second sodium bicarbonate crystals withdrawn from the cooling crystallization unit may be fed to a sodium bicarbonate reactive crystallization unit, to a caustic unit, or may be separated and dried. The reactive crystallization, separation and / or drying units where the second sodium bicarbonate crystals are further processed may be the same units where the first sodium bicarbonate crystals are processed.

The invention provides a large-particle (granular) semi-batch baking soda reactive crystallization process method. The method comprises the following steps: taking a saturated aqueous solution of sodium bicarbonate and a saturated solution of base (with a principle component of sodium carbonate) as raw materials, and controlling the degree of supersaturation by utilizing a gas-liquid reaction by virtue of a seed crystal adding method, thereby obtaining the large-particle (granular) baking soda crystal product. The specific process comprises the following four steps: preparing the solution, adding the seed crystal, performing reactive crystallization and discharging fine grains. According to the method, the large-particle (granular) baking soda crystal product can be prepared.

The invention discloses a method for separating arsenic and alkali in arsenic and alkali residues based on a superfine ferric hydroxide colloid. The method includes the steps: leaching the arsenic andalkali residues by water, and performing antimony removal on leaching solution through oxidation to obtain solution containing sodium carbonate and sodium arsenate; adding iron arsenate crystal nucleus and the superfine ferric hydroxide colloid to perform reaction to obtain iron arsenate crystals, and performing solid-liquid separation to obtain solution containing sodium carbonate and an iron arsenate product; leading carbon dioxide into the solution containing the sodium carbonate to perform reaction to separate out sodium hydrogen carbonate crystals, and performing thermal decomposition onthe sodium hydrogen carbonate crystals to obtain a sodium carbonate product. According to the method, arsenate in arsenic and alkali residue leaching solution is adsorbed and converted by the superfine Fe (OH)3 colloid with high activity to generate stable iron arsenate precipitation with low solubility and good crystal property, arsenic and alkali in arsenic and alkali residue leaching solutionare effectively separated, and the method overcomes the shortcomings of low iron salt arsenic removal utilization efficiency, incomplete purification and the like under the strong alkaline condition,is simple in process and convenient to operate and meets industrial production.

A crystallization method through gas-liquid biphasic reaction is disclosed. Liquid materials react with gas phase materials to produce solid phase crystals. The method includes the following steps that: in a low temperature crystallizer, liquid materials and gas phase materials are subjected to chemical reactions so as to realize generation and growth of crystal nucleuses, wherein the chemical reaction process is a biphasic continuous reaction process that comprises a chemical reaction process of which the liquid materials are continuous phase and the gas phase materials are dispersed phase and a chemical reaction process of which the gas phase materials are continuous phase and the liquid materials are dispersed phase; then in a high temperature crystallizer, a reaction process of using a liquid phase as a continuous phase and a gas phase as a dispersed phase on the crystal nucleuses is performed so as to crystallize and make the crystal nucleuses become bigger; a high temperature crystal plasma separator is used to obtain solid phase crystallized products. The crystal nucleuses can be automatically returned in a crystal nucleus system so that formation and quantity of the crystal nucleuses can be controlled. The grown crystals are taken out in a high temperature area of an apparatus and the crystal nucleuses are formed in a low temperature area of the apparatus. The processes of generation and growth of the crystal nucleuses are performed in different containers of a gas-liquid biphasic response apparatus provided in the invention.

A process for the production of sodium carbonate and sodium bicarbonate out of trona, comprising crushing trona ore and dissolving it in a leaching tank containing a solution comprising sodium carbonate and sodium bicarbonate, and an additive selected from the group consisting of: phosphates, phospholipids, carboxylates, carboxilic acids, and combinations thereof, saturated in sodium bicarbonate, in order to produce solid particles suspended in a production solution comprising sodium carbonate, the solid particles containing insoluble impurities and at least 65% by weight of sodium bicarbonate. The solid particles are separated from the production solution containing sodium carbonate. At least part of the production solution containing sodium carbonate is taken out of the leaching tank.

Methods and systems are provided for producing a carbonate precipitation material comprising stable or reactive vaterite from carbide lime that provides both a source of divalent cations (Ca divalent cations, Mg divalent cations, etc.) and a source of proton removing agent. A method of forming drywall, comprising a) contacting an aqueous solution comprising carbide lime with carbon dioxide from an industrial process; b) producing a precipitation material comprising reactive vaterite; c) setting and hardening the precipitation material by transforming the reactive vaterite to aragonite, and d) forming the drywall.

The invention discloses a device and production method for increasing the particle size of baking soda by adopting a pre-carbonization method. The device comprises carbonization towers, the carbonization towers are divided into cleaning towers and alkali making towers, the tops of the carbonization towers are provided with tail gas discharge ports, the side surfaces of the tops of the carbonization towers are provided with feed ports, the side surfaces of the bottoms of the carbonization towers are provided with mixed gas inlets and liquid outlets, the mixed gas inlets of the carbonization towers are connected to a mixed gas inlet pipeline, the mixed gas inlet pipeline is formed by converging a low-concentration carbon dioxide pipeline and a high-concentration carbon dioxide pipeline, theliquid outlets of the carbonization towers are connected to a carbonized liquid outlet pipeline, the carbonized liquid outlet pipeline is branched into a carbonized crystal mush pipeline and a pre-carbonized crystal mush pipeline, the carbonized crystal mush pipeline is connected to a thickener through a crystal mush pump, the pre-carbonized crystal mush pipeline is connected to the feed ports ofthe carbonization towers through an alkali liquid pump; the feed ports of the carbonization towers are connected to an alkali liquor pipeline, and the tail gas discharge ports are connected to tail gas emptying pipelines and a carbonized tail gas recycling pipeline. According to the device and the production method, the production cost is lowered, the process operation is simple, and the popularization is convenient.

A method and apparatus for continuous fabrication of homogeneous thin flake or powder electrolyte material from inorganic salt, metallic or similar materials or from mixtures of such materials for use in Carbonate Fuel Cell (“CFC”) power plants. Electrolyte precursor powders are fed to a continuous blender type mixer using precision metering equipment that controls material feed rates. The homogenous mixture of blended powders is then fed into a high temperature melting tank in which the mixture is melted, forming the desired molten eutectic composition. The liquid eutectic melt drips from the melting tank through ceramic or metallic nozzles and splat-cools on a rotating, water-cooled metal cylinder to produce uniform size, thin flake material. The thin flake electrolyte material can be used as-is, or it may be further processed using continuous grinding and powder fabrication equipment.

According to some demonstrative embodiments, there is provided herein a spherical fertilizer granule having a specific gravity of more than 1.94 g / cm2 and less than 3% porosity.

A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form further potassium sulfate.

The invention discloses a method for increasing a crystal size of sodium bicarbonate. The method comprises the following steps: preparing a saturated solution or a supersaturated solution of sodium bicarbonate, introducing the saturated solution or the supersaturated solution of the sodium bicarbonate in an apparatus for increasing the crystal size of sodium bicarbonate through a raw material liquid inlet. The apparatus comprises a tank and a center back flow; and the raw material liquid inlet, a crystal mush outlet, a cycle cooling material liquid axial-flow pump outlet and an overflow port are arranged in the tank. the cycle cooling material liquid axial-flow pump outlet is arranged at an upper and upper part of the tank, and is used for leading the material liquid in the tank and cooling the material liquid; the center back flow is used for introducing the cooled material liquid in the tank, an outlet of cooling material liquid back flow pipe of the center back flow is arranged at amiddle and lower part of the tank, the cycle cooling of the material liquid is realized, a sodium bicarbonate product with a particle size being 180-380 [mu]m is prepared, and the requirement of thesodium bicarbonate product with the large particle size is satisfied.

The invention belongs to the field of chemical low-salt dense soda ash equipment, and particularly relates to a dense soda ash high-efficiency crystallization production device, a motor is started torotate to drive a stirring belt to rotate, a gas flow generated by the rotation of a gas in a crystallization furnace along with the stirring belt spirally ascends, the gas on the upper side of the crystallization furnace extrudes a pressure valve on a second fixing plate through an one-way valve, the gas pressure is increased, at the moment the gas pressure breaks down the pressure valve, the gaspressure pushes a sliding plate and a first pressure plate on the upper side of the crystallization furnace to slide downwards, and a spring is stretched; steam in a steam chamber enters the crystallization furnace, the gas pressure is increased, at the moment the gas pressure breaks down a pressure valve at the lower side of the crystallization furnace, the gas pressure pushes a sliding plate and a second pressing plate on the lower side of the crystallization furnace to slide upwards, the spring is stretched, the spring rebounds to drive the sliding plate to slide back, and the sliding plate, the first pressing plate and the second pressing plate slide back and forth to stir crystal slurry in the crystallization furnace, so that the slurry is continuously circulated, and crystal grainsgrow continuously.

The invention relates to a method for recycling and treating arsenic slag resources by freezing and separating arsenic and alkali in alkaline slag water extract. The method comprises the following steps of adding water into alkaline slag, pulping, leaching with water, introducing CO<2> gas to convert NaOH in the slurry into Na<2>CO<3>, evaporating and concentrating the separated Na<2>CO<3>-containing arsenic alkaline water extract, cooling, freezing and crystallizing, dissolving the separated wet crystals, cooling, freezing and recrystallizing again to obtain sodium carbonate, concentrating the separated arsenic-containing mother liquor, carrying out secondary freezing crystallization treatment, precipitating arsenic by using a Na<2>S saturated aqueous solution, maintaining the pH value at1-2 by using H<2>SO<4>, adding pulverized coal into filter residues separated from an arsenic precipitation mixed solution, and carrying out oxidation incineration to obtain As<2>O<3>, and convertingthe filtrate with lime. According to the method, arsenic and alkali in the alkaline slag water extract are separated through freezing crystallization, Na<2>CO<3>.10H<2>O is obtained through freezingrecrystallization, and Na<2>S is used for precipitating arsenic, so that arsenic slag resources can be well recycled.