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1. 发明授权

US4867961A Method of removing sulphur dioxide from a gaseous stream 失效
标题翻译：从气流中除去二氧化硫的方法
公开(公告)号：US4867961A
公开(公告)日：1989-09-19
申请号：US160699
申请日：1988-02-26
申请人： Joseph Palmer
发明人： Joseph Palmer
IPC分类号： B01D53/50 , C01B17/50 , C01B17/74 , C01D5/00 , C01F5/08 , C01F5/30 , C01F5/40 , C01F11/24
CPC分类号： C01F11/24 , B01D53/501 , C01B17/501 , C01B17/74 , C01D5/00 , C01F5/08 , C01F5/30 , C01F5/40
摘要： Capture-fixation of SO.sub.2 from flue and non-ferrous smelter gases is achieved with the use of MgO aqueous slurry as an absorbing medium. During the absorption, most of the MgO is converted to MgSO.sub.4 and the rest is solubilized as MgSO.sub.3 and Mg(HSO.sub.3).sub.2. The clear solution obtained at the end of the absorption is brought to about 40.degree. C. and is treated with sulphuric acid in an amount representing at least 5% in excess of the stoichiometric requirement whereby sulphite and bisulphite of magnesium are converted to magnesium sulphate. The magnesium sulphate obtained above can be used in a two stage addition of potassium chloride to obtain magnesium chloride, and calcined dolomite added to the remainder whereby magnesium hydroxide is precipitated and may be filtered off from the resulting CaCl.sub.2 solution. The process provides a means of removing SO.sub.2 from flue and smelter gases and at the same time produces industrially important chemical products (SO.sub.2, H.sub.2 SO.sub.4, K.sub.2 SO.sub.4, MgO, CaCl.sub.2).
摘要翻译：通过使用MgO含水浆料作为吸收介质，可以实现烟道和有色金属冶炼气体SO2捕集固定。在吸收过程中，大部分的MgO被转化为MgSO 4，其余的以硫酸镁和Mg（HSO3）2的形式溶解。在吸收结束时获得的澄清溶液达到约40℃，并且用超过化学计量要求的至少5％的量的硫酸处理，从而将亚硫酸盐和亚硫酸氢盐转化成硫酸镁。得到的硫酸镁可以两步加入氯化钾，得到氯化镁，煅烧后的白云石加入其中，由此使氢氧化镁沉淀，并从所得的CaCl 2溶液中滤出。该方法提供了从烟道和冶炼气体中除去SO2的方法，同时产生工业上重要的化学产物（SO2，H2SO4，K2SO4，MgO，CaCl2）。

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