序批式中和沉淀法处理钛生产含铬废水研究

摘要

氯化法海绵钛生产过程中会产生大量的含重金属离子的酸性废水,含有大量的重金属氯化物,主要污染物为Cr（Ⅲ）和Mn（Ⅱ）,应当调节pH值至Cr3＋沉淀完全,将含铬废水单独处理。采用传统工艺投加石灰乳后沉淀[1],会产生大量的含铬废渣难于处置。本研究通过实验室研究和工程实践,开发了一种序批式的中和沉淀法,可以实现连续准确控制pH值,使铬渣控制在最少量。%A great amount of acidic wastewater containing heavy metal ion will be produced in the process of titanium sponge production, containing a large amount of heavy metal chloride, with principle pollutant of Cr（ Ⅲ ） and Mn （Ⅱ）. PH value shall be adjusted until Cr3 ＋ is precipitated completely. Chromium- containing wastewater shall be treated separately. To adopt traditional technology of precipitating after add of lime milk will produce a lot of chromium residue which is difficult to be treated. Through lab research and engineering practice, this research develops a sequencing batch reactor neutralization precipitation method which can control pH value continuously and accurately so as to control chromium residue at the minimum amount.