Method for recovering cooper and silicon powder from organosilicon waste residue

Abstract

The present invention relates to the technical field of organosilicon production, and discloses a method for recovering copper and silicon powder from organosilicon waste residue. The method comprises the following steps: (1) ripening, (2) water dipping, (3) solid-liquid separation, (4) extraction, (5) washing, (6) back extraction, and (7) copper electrowinning. According to the present invention, concentrated sulfuric acid is adopted to carry out oxidation so as to easily achieve complete copper recovery; during extraction, an ultrasonic treatment is adopted so as to avoid emulsification phenomenon generated during extraction, and provide a good extraction phase separation effect; and process steps are simple, treatment cost is low, operation is easy, recovery rates of cooper and silicon powder are more than 95%, the obtained electrowinning cooper has a purity of more than 99.95%, the obtained silicon powder has a purity of more than 90%, recovery rates of cooper and silicon powder are high, and purities are good.

Description

technical field [0001] The invention relates to the technical field of organosilicon production, in particular to a method for recovering copper and silicon powder from organosilicon waste residue. Background technique [0002] Organosilicon is a kind of polysiloxane or polysiloxane, which has a high bond energy and is not easy to break, with silicon atoms and chlorine atoms or oxygen atoms in the molecular chain. [0003] In the production process of organosilicon chemical products such as methylchlorosilane and phenylchlorosilane, organosilicon monomer is the main raw material, copper powder or copper salt is used as catalyst, and the mixture of unreacted silicon powder and catalyst in its production is called Organic silicon waste residue contains a considerable amount of silicon powder, copper powder or copper salt, which has a high recovery value. If it is directly buried, it will not only cause serious environmental pollution, but also lose a large amount of silicon and...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: 1. Silicon powder is not easy to disperse. When gravity separation is carried out, a large amount of copper or copper salt will be mixed in the silicon powder, resulting in a low recovery rate of copper; 2. There are more organic matter in the organic waste residue. , this method does not deal with the organic matter. During the extraction, the emulsification is very serious, and the phase separation of the extraction is not good; 3. The existence of copper in the organic silicon waste residue is relatively complicated, with monovalent copper ions, divalent copper ions, and copper Elemental, dilute sulfuric acid will not react with elemental copper in this method, and elemental copper cannot be effectively recovered

The disadvantage of this method is that the treatment period is long, the recovery rate is low, the environmental pollution is large, the energy consumption of the pyroprocessing (calcination) is high, and the direct recovery and purification of copper cannot be carried out.