Soda industry is an important chemical raw material industry, soda ash is the protection of national economic development, the basic industrial raw materials. China's soda ash in the international market has a strong competitive edge. Countries in the "Tenth Five-Year" or even a long period of time, organic materials, composite materials, new technologies, fine chemicals and the traditional "two bases" and as a chemical "Tenth Five-Year Plan" and the next 15 years the focus of planning.
At present, China's soda ash is used mainly ammonia soda process and the production of alkali. Ammonia is alkaline salt and limestone as the main raw materials, ammonia in the middle of the supporting material for the production of soda ash method. Refining processes in brine,细盐water Mg2 +, Ca2 + reaction Mg (OH) 2 and CaCO3, the formation of salt, cement, salt, cement mixed with the distilled liquid waste by the filter press for clarification or clear liquid (L1) emissions, solid slag (S1) storage. Salt water (or water) as a coarse salt dissolved after water purification to remove Ca2 + and Mg2 + impurities, refined salt in the ammonia absorption tower to absorb ammonia to generate ammonium salt, ammonia salt absorption of carbon dioxide in the carbonation tower, NaHCO3 generate suspension, suspension by the vacuum filter cake obtained after calcination products for soda ash, calcined return carbon dioxide generated by the use of carbonation tower; filtering the mother liquor by adding milk of lime has been sent to distillation tower ammonia ammonia recovery, recovery ammonia ammonia absorption tower for the preparation of ammonium salt. Joint alkali plant based on ammonia production from ammonia and carbon dioxide and crude salt as raw materials to produce soda ash and ammonium chloride co-production method. In the process of making soda ash, ammonia and carbon dioxide in the mother liquor Ⅱ carbonation carbonation tower, the generated suspension NaHCO3, vacuum filtration of the mother liquor after the process of sending Ⅱ,
Cake for the soda ash after calcination products; Preparation of ammonium chloride in the process, from the mother liquor vacuum filter ammonia by absorption, heat exchanger, the mold in the cold analysis of crystal precipitate ammonium chloride slurry, after the cold out salting-out mother liquor in the crystallizer to precipitate ammonium chloride in the salt crystal slurry, the mother liquor after salting-out via heat exchangers, absorption of ammonia, to clarify the post-production of ammonia was qualified mother liquor Ⅱ, Ⅰ sent to the process. Analysis of cold precipitation and salting-out process of the crystal slurry, by, centrifuge, dry products to be ammonium chloride.
Both the production process, soda ash and ammonium chloride in the production process, there is a long process, the system mother liquor at high temperature and composition of complex with ammonia and ammonium root, and contains a certain amount of calcium, magnesium solids, particularly in the emissions of green waste processing, pipelines and other equipment corrosion, wear and tear very serious, equipment failure, etc., have frequent maintenance. Equipment, thereby increasing corrosion resistance, wear-resistant performance of safe and stable operation of the equipment is extremely important. In particular, as fluid control components bear the brunt of the valve.
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