硫化物沉淀系统Cu2＋诱导结晶过程研究

The study on the process of copper induced crystallization in the sulfide system

以模拟含铜废水为处理对象,在流化床反应装置中对比考察了回流系统以及沉淀剂pH条件改变对硫化物沉淀系统Cu^(2+)诱导结晶过程的影响。结果表明:(1)在硫化物沉淀系统中,当进水Cu^(2+)约为200mg/L、沉淀剂pH为8~12时,系统发生均相成核过程,系统出水中Cu^(2+)去除率可达98%以上,微晶产率低于2%。随着沉淀剂pH提高至12.0,CuS过饱和指数提高至4.08×1011,微晶质量浓度变化不超过1个数量级,低于7mg/L。(2)结晶产物以CuS及Cu(OH)_2为主,并含有无定型非晶成分。

Abstract： The influence of pH and the different recirculation on the copper induced crystallization in the sulfide system were investigated. The results showed that： （1） The fine generation efficiency lowed to 2% and the copper re- moval efficiency increased to 98% when the influent copper condition was 200 mg/L, pH of the precipitation agent was from 8 to 12. As precipitant pH rose to 12.0, copper sulphide supersaturated index increased to 4.08 X 10^11 , but there was only one order of magnitudes for the variation of the microcrystalline concentration,less than 7 rng/L. （2） The main composition of crystallization product in the precipitation system was copper sulfide with a small amount of copper hydroxide and amorphous component.