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1439results about "Alkali metal chlorides" patented technology

Application of MVR (mechanical vapor recompression) crystallizing evaporator in sodium sulfate and sodium chloride separation technology

The invention discloses an industrial application of an MVR (mechanical vapor recompression) crystallizing evaporator technology in the production of sodium sulfate and sodium chloride in Huaian, Jiangsu, and relates to an improvement of a salt and sodium sulfate coproduction evaporation technology, belonging to the technical field of chemical three-waste treatment and utilization, and in particular to an application of an MVR crystallizing evaporator in a sodium sulfate and sodium chloride separation technology. The application is mainly technically characterized in that sodium sulfate liquid is concentrated by the MVR crystallizing evaporator, the sodium sulfate is produced at high temperature, and the sodium chloride is produced at low temperature. According to the invention, the mechanical re-compressed vapor is evaporated, concentrated and crystallized at 90-100 DEG C to obtain sodium sulfate, and the re-compressed vapor at a low temperature of 55 DEG C is concentrated and crystallized to obtain sodium chloride. According to the invention, the application of the MVR technology to the concentration of sodium sulfate liquid is realized, the sodium sulfate is produced at high temperature, and sodium chloride is produced at low temperature. The application disclosed by the invention is an environmental protection project which saves energy, reduces emission and avoids waste gas, waste water and waste residue.
Owner:NAFINE CHEMICAL INDUSTRY GROUP CO LTD

Process method for recovering ammonium chloride and sodium chloride from waste water containing ammonium chloride and sodium chloride

The invention relates to a process method for recovering ammonium chloride and sodium chloride from waste water containing the ammonium chloride and the sodium chloride, which produces the ammonium chloride and the sodium chloride by using mother solution which is generated in a process for producing sodium bicarbonate by natural bittern double decomposition reaction and contains the ammonium chloride and the sodium chloride as raw materials. The method adopts ammonium still, evaporation, crystallization and separation process to treat, wherein the evaporation adopts multiple-effect, a heat pump and a vacuum evaporation process, and selects a falling film evaporator and a forced circulation type evaporator to perform triple-effect mixed-flow procedure, so that sodium chloride is crystallized and separated in the evaporation; and the ammonium chloride is crystallized and separated by cooling after the evaporation. The method effectively reduces the operation temperature of the equipment, can repeatedly use secondary steam and condensed water, reduces erosion of the ammonium chloride solution to the equipment, saves the energy, reduces the cost, improves the production efficiency, and reduces environmental pollution.
Owner:HEBEI UNIV OF TECH +1

Chemical industrial waste salt refining process

The invention relates to a chemical industrial waste salt refining process which comprises the following steps: pretreating high salt wastewater generated in the production process of aminobenzene ether and p-nitrophenol so as to adjust the pH value, adsorbing by using activated carbon, kieselguhr or macroporous resin, removing organisms and organic salts in the wastewater, reducing the COD of the wastewater, neutralizing the high salt wastewater, performing multi-effect evaporation or mechanical recompression so as to evaporate and crystallize, and centrifuging a solid salt; performing high-temperature calcination on the centrifuged solid salt in a rotary kiln or a tunnel kiln, thereby decomposing and oxidizing the organisms at a high temperature, further thoroughly combusting the tail gas generated through calcination in a heat accumulation type tail gas combustion furnace, preheating and recycling the tail gas, performing spraying absorption, dissolving the calcinated salt with water so as to prepare a saturated solution, filtering by using a precise filter, directly supplying the filtrate to ionic membrane caustic soda for use, or performing multi-effect evaporation or mechanical recompression on the filtered saturated salt water so as to evaporate, crystallize and purify, and performing centrifugation, thereby obtaining high-quality solid sodium chloride.
Owner:JIANGSU ZHONGDAN GROUP

Crystallization treatment method and device of high salt wastewater

The invention relates to a crystallization treatment method and device of high salt wastewater and belongs to the technical field of water treatment. The method is characterized in that after sodium sulfate concentrated water is treated by a freezing crystallization system, generated mother liquor A enters into an MVR system for evaporative crystallization; after sodium chloride concentrated water is treated by the MVR system, generated mother liquor B enters into a freezing crystallization system for freezing crystallization, and the mother liquor can be treated in a circulation overlapping manner; a drain outlet of the MVR system of the device is connected with a liquid inlet of a crystallization tank in the freezing crystallization system through a pipeline and the drain outlet of the freezing crystallization system is connected with a liquid inlet pipe of the MVR evaporative crystallization system. The method has the advantages that the mother liquor is treated by a freezing crystallization technology and an MVR evaporation crystallization technology in a circulation overlapping manner, so that the problems of zero emission and resource utilization are solved, and therefore, the energy consumption is effectively reduced and the operating cost is lowered.
Owner:INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH

Comprehensive utilization method for bittern

The invention relates to a comprehensive utilization method for bittern, which belongs to the technical field of salt chemical engineering. The bittern is a liquid mineral product, and is rich in multiple elements such as potassium, sodium, lithium, boron, bromine, iodine and the like; and at present, in the prior domestic bittern development and utilization, some simple components or components with high additional value in the elements are extracted, and the un-extracted components are discharged along with old bittern to be abandoned so as to cause serious waste of resources and pollute the environment. Through reasonable combination of processes of removing H2S from the bittern, settling magnesium, settling calcium and preparing calcium carbonate, preparing potassium-sodium mixed saltthrough primary salt preparation and secondary salt preparation, extracting potassium chloride through flotation, extracting boron, iodine, bromine, rubidium and cesium through acidification, preparing rubidium chloride and cesium chloride, extracting lithium and the like, the method implements step-by-step ordered extraction of main components; the toil yield of several main components reaches over 95 percent; and the method has the advantages of mutually exclusive loss in component extraction, implementation of closed cycle of processes, no mother liquor discharge, simple process control, low cost, high yield, environmental protection and the like.
Owner:DAZHOU HENGCHENG ENERGY GROUP

Method for producing potassium chloride by steel enterprise sintering electro-precipitating dust

The invention relates to a method for producing potassium chloride by using electric precipitator dust of a sintering process of a steel plant, which belongs to a production technology of potassium salt. Under room temperature, tap water is adopted and is leached by adding appropriate SDD under the condition that liquid-solid ratio is 2/1 to 1/1; the leaching rate can be up to 95 to 99.5 percent. Filter residue after filtration is returned to the sintering process after drying; leaching liquid is heated and concentrated to 3/5 to 4/5 of original volume; product of the potassium chloride and sodium chloride is slowly cooled and fractionally crystallized; purity can be up to 95 to 98 percent; total concentration of calcium and magnesium is 0.4 to 3 percent. Crystallization mother liquor is returned for leaching the precipitator dust. The method for producing the potassium chloride by using the electric precipitator dust has simple and easy process, little energy consumption, without wastewater discharged; at the same time, the method makes up current situation of shortage of potassium recourse in our country to a great extend and avoids that vicious circle of alkali metal affects normal proceeding of the sintering process of steel industry.
Owner:唐山汇鑫嘉德节能减排科技股份有限公司 +1

Salt, alkali and calcium combined cycle production technology by the use of well mineral salt

The invention relates to a salt, alkali and calcium combined cycle production technology by the use of well mineral salt. Based on the exploitation of brine from well mineral salt, the salt, alkali and calcium combined cycle production technology by the use of well mineral salt is a cycle production technology, which focuses on the technology for making alkali from brine by the ammonia-soda process and takes account of the vacuum salt-making (including the brine refinement) and calcium-making technologies. Alkali-making wastewater replaces most fresh water to be injected into a salt mine well to collect brine, and the obtained high-calcium brine is taken as the raw material of the salt and calcium (including liquid calcium) co-production as well as the raw material for preparing alkali and other chemical production raw materials, wherein the liquid calcium can be used to produce liquid salt; alkali-making waste residues are injected into an underground dissolution cavern, namely a salt cavern which is formed by the exploitation of brine from well mineral salt, thus accomplishing the combined cycle production technology in which alkali-making and salt-making technologies are closely related with materials. The produced wastes are used as resources or undergo a harmless treatment, thus protecting the environment. In addition, the utilization rate of sodium chloride in rock salt reaches 100%, achieving maximum efficiency.
Owner:江苏苏盐井神股份有限公司 +1

Technique for desalting sea water, making salt and comprehensively using by-products thereof by utilizing wind energy, solar energy and heat pump technologies

The invention relates to a technique for desalting sea water, making salt and comprehensively using by-products thereof by utilizing wind energy, solar energy and heat pump technologies, the main procedures comprise desalting sea water, air-blowing bromine, removing impurities for clarification, heating solar pond and storing halogen, evaporating for concentration, compressing and crystallizing for salt making, brine chemical engineering, etc. the invention desalts sea water, makes salt and comprehensively uses by-products thereof by utilizing wind energy, solar energy and heat pump technologies, organically combines sea water desalting, salt making and comprehensive use of dregs and waste liquor, takes wind energy, solar energy and other renewable energy resources as main energy sources, changes sea salt production from drying on beach in the open air manually to mechanized and automated operation, puts an end to the backward state of sea salt enterprises, can save energy consumption and reduce pollution, can save investment by about 50% and occupied area by 95%, not only lowers production cost, but also recovers 35m<2> of fresh water by producing one ton of salt, thus protecting fresh water resource.
Owner:ZHANJIANG NONGHAI TECHNOLOGY CO LTD
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