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Zhongzhou Branch steam jet pump in the mother liquor evaporation section of alumina industrial application has achieved remarkable results, the vacuum increased from -0.07MPa to -0.078MPa, the final temperature decreased from 71 ℃ to 65 ℃, the evaporator discharge concentration from 237g / l increased to 245.9g / l, salt solid content from 43.5g / l increased to 56g / l, for the production process of alkali balance, to strengthen the sintering process technology to further improve, to reduce the evaporator steam consumption laid Solid foundation.
At present, the achievement has been popularized and applied in the evaporation process of the mother liquor in the sintering process of many enterprises within the aluminum industry of China and the joint production of alumina process, and the economic benefit of nearly 2 million yuan has been produced.
Through the study of the relationship between saturated vapor pressure and saturation temperature of saturated sodium aluminate solution, this project proposed a process route to further increase the degree of vacuum in the flash system, to increase the amount of water evaporated by crystallization and to increase the primary crystallization cycle of the evaporated mother liquor. Based on a selection of vacuum pump features, the innovative ring vacuum pump-steam jet pump combination replaces the original single-ring vacuum pump set; the technology and equipment portfolio was first introduced in the alumina industry and is innovative . Using this technology to further improve the water vaporization capacity of the evaporator group, a single evaporator group evaporation increased by 7.3 tons / hour, in the alumina industry is a leading domestic level.