Method for purification of spent sulfuric acid from titanium dioxide rutile industry
    1.
    发明授权
    Method for purification of spent sulfuric acid from titanium dioxide rutile industry 有权
    从二氧化钛金红石工业中纯化废硫酸的方法

    公开(公告)号:US09150440B2

    公开(公告)日:2015-10-06

    申请号:US13468427

    申请日:2012-05-10

    摘要: A method for the purification of spent sulfuric acid and particularly the purification of spent acid, from titanium dioxide rutile manufacture through a chloride route, is provided. In the chloride route of titanium dioxide manufacture, sulfuric acid is used to clean the un-reacted gaseous flow coming out of the oxidizer, so the spent acid mainly contains un-reacted Ti4+ ions, trace amounts of Fe3+ ions, and NO2 gas. Titanium phosphate can be precipitated using acidic and or alkaline phosphate-containing precipitants in stoichiometric amounts. The method can include the addition of cutting water to commence the precipitation in two or more steps, when an acidic precipitant is used, and in one step with half the volume of water when an alkaline precipitant is used.

    摘要翻译: 提供了从二氧化钛金红石制造通过氯化物路线纯化废硫酸,特别是纯化废酸的方法。 在制造二氧化钛的氯化物路线中,使用硫酸清洗从氧化剂出来的未反应的气体流,因此废酸主要含有未反应的Ti4 +离子,痕量的Fe3 +离子和NO2气体。 可以使用化学计量的酸性和/或碱性磷酸盐沉淀剂沉淀磷酸钛。 该方法可以包括添加切割水以在使用酸性沉淀剂的情况下以两个或多个步骤开始沉淀,并且在使用碱性沉淀剂时,一步加入一半体积的水。