A novel technique without any pollution of deep processing of bentonite to manufacture sodium metasilicate was proposed;Meantime, white carbon black can be synthesized from the alkali waste liquid;

• 确立了膨润土深加工合成五水偏硅酸钠，废渣、废液联产白碳黑，硫酸铝铁净水剂的闭合无污染生产工艺路线。