Soda ash industry is an important chemical raw material industry, soda ash product is to protect national economic development, basic industrial raw materials. China's soda ash soda ash products in the international market, has a strong competitive edge. Countries in the "15" and even over the longer term, organic raw materials, synthetic materials, new technology, fine chemicals and the traditional "two bases" and as a chemical "Tenth Five-Year Plan" and the next 15 years, the focus of the planning.
At present, China's soda ash ammonia soda business is mainly used for production of alkali and the United Nations. Solvay is a salt and limestone as the main raw materials, auxiliary materials, intermediate ammonia method of production of soda ash. In the brine refining process, crude salt water, Mg2 +, Ca2 + the reaction of Mg (OH) 2 and CaCO3, the formation of salt, cement, salt, cement and distilled liquid waste mixed waste by the clear liquid to clarify or filter press (L1) emissions, solid slag (S1) stockpiling. Salt water (or sea) salt dissolved into crude, after refining crude salt in the water to remove Ca2 + and Mg2 + impurities, refined salt water after the ammonia in the absorption tower to absorb ammonia ammonia salt, ammonia salt water in the carbonation tower to absorb carbon dioxide, Build NaHCO3 suspension, suspension, through the vacuum filter cake obtained after calcining for soda products, carbon dioxide generated by calcination to return carbonation tower use; filtering the mother liquor by adding lime to be sent to the recovery of ammonia Ammonia distillation towers, recycling Tower of ammonia for the preparation of ammonium salt of ammonia absorption. Hou's process is based on the production of ammonia from the ammonia plant and carbon dioxide and salt as raw materials to produce soda ash and ammonium chloride co-production methods. Preparation of soda ash in the process, ammonia liquor Ⅱ and carbon dioxide in the carbonation carbonation tower, the generation NaHCO3 suspension, vacuum filtered mother liquor sent Ⅱ process, after the cake calcined soda products; Preparation of ammonium chloride in the process, the mother liquor from the vacuum filter through the absorption of ammonia, heat exchanger, the mold in the cold analysis of crystal precipitate ammonium chloride slurry, cold analysis after the mother liquor in the salting-in salt crystallizer to precipitate ammonium chloride crystal slurry , salting and then through the heat exchanger after the mother liquor, smoking and ammonia, were qualified to clarify the post-production of ammonia liquor Ⅱ, Ⅰ sent to the process. Crystallization and precipitation of crystalline salting process pulp, through the thick, centrifugal separation and drying to be ammonium chloride products.
Both the production process, soda ash and ammonium chloride in the production process, there is a long process, the system liquor at high temperature, but also in the complex composition, not only ammonia and high-chlorine root, and contains a certain amount of calcium, magnesium solids, especially in the environmental emissions of waste processing, equipment, pipelines and other corrosion, wear extremely serious, equipment failures, maintenance frequent occurrence. Therefore, to improve equipment corrosion resistance, wear safety equipment and stable operation of great importance. In particular, as fluid control components, valves are particularly affected.
Present, China's various industries commonly used in the production of valves for the metal valves, metal valves been in use for a hundred years of history, during which although after the structural and material improvements, but subject to the conditions of metallic materials, self-limited, Yue Lai Vietnam can not adapt to high wear and tear, strong corrosion and other bad working conditions. Life is short, a serious leak. Greatly affected the stability of the system is running. Traditional metal valves is urgently needed materials, design and manufacturing processes, etc. overhaul.
Engineering ceramics materials as the twenty-first century, new materials, with its itself possess high hardness, high strength, high wear resistance and good anti-corrosion performance, since World War II, they were popular in the developed world, they the race to deploy manpower and material resources, research and development of engineering ceramics, the earliest in the military and aerospace industries, such as rocket nozzle end of the shuttle heat shield, armored vehicles and so on, then gradually applied to industrial fields, such as ceramic engines, ceramic bearings, etc. Until the early nineties the twentieth century, with the ceramic material itself enhance the performance began to be used in the valve industry, and has been widely recognized.
Engineering Ceramics also known as structural ceramics, and ceramics are essentially different from ordinary. Valve used on ceramic materials is mainly TZP, it is the raw material is a zirconium gem materials, spray granulation, and so quiet repression, high-temperature sintering, precision machining, making ceramics, "brittle," has been greatly improved, its toughness and strength has been greatly improved, industry called "ceramic steel." TZP ceramics not only has high toughness, high strength, high hardness, high wear resistance and high corrosion resistance, but also self-lubricating, good thermal conductivity is low, an excellent surface finish (Ra up to 0.01um) and other characteristics It is an excellent replacement of the valve metal material.
Ball since its inception, with its well-sealed-off, aiming to halt the performance, as well as the flow path simple, seamless adjustment, KV value of the most, "self-cleaning" the best performance, opening and closing simple and fast, and strong ability to overcome the pressure difference characteristics, in the petrochemical, mining metallurgical, power energy, pharmaceutical and paper industries the rapid expansion of the range of applications. The ceramic ball valve and ball valve combination of structural ceramics dual advantages of a good solution to the soda ash production process in the presence of high corrosion, wear two major problems with high solid content, especially in salt water and distillation processes, ceramic ball hit the core collapse of the current of any corrosion-resistant materials, wear-resistant alloy spool, so far the best ceramic ball valve into the valve.
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