Abstract:

A chemical treatment for recovery dust and gravel is proposed through experiments.In the method, the recovery dust and gravel are dissolved by acid hydrolysis, the insoluble materials are filtered, the impurities such as iron, aluminum and heavy metal are precipitated and the light calcium carbonate with high purity and high brightness is obtained by carbonization method.In addition, high purity calcium oxide and calcium hydroxide are obtained by calcination and digestion, which can be applied in high purity products required for fine chemical, environmental protection, pharmaceutical and electronic industries.