浆体循环与陈化黄饼沉淀工艺研究

Precipitation of yellowcake through slurry circulation and aging

采用浆体循环与陈化沉淀的方法,使沉淀的铀浓缩物由无定形凝胶体或微晶转化成易沉降过滤的粗晶体。探讨了循环与陈化沉淀工艺的原理,研究了循环次数、SO42-浓度、循环比、中和剂加入方式等因素的影响。该工艺可改善产品沉降、洗涤与过滤性能,降低试剂消耗,提高产品质量,具有良好的经济效益。

Through precipitate circulation and aging, the yellowcake slurry in amorphous or microlite form was transformed to crystal precipitate. The principle of the process is discussed, and the influences of circulation times, sulphate concentration, circulation ratio, neutralizer adding mode and some other factors on yellowcake precipitation were tested. The laboratory and pilot test results show this process can significantly improve the precipitate＇s settling, washing and filtration properties and the product quality, and reduce the consumption of neutralizer.