Foam flotation method capable of separating silicon powder and carbon silicon powder

The invention relates to technology for the powder separation of silicon and carborundum in mortar produced in a silicon chip wire sawing process in the field of solar photovoltaic, in particular to a foam flotation method for separating silicon from carborundum. The foam flotation method for separting silicon power and carborundum powder comprises the following steps of: adding a finishing agentinto mortar produced in a silicon chip wire sawing process according to a principle of 100 to 1,000 weight portions of mortar and 100 to 1,000 weight portions of finishing agent; and stirring the mortar and the finishing agent uniformly, allowing the mixture to settle in three layers, and collecting the upper layer of carborundum and the lower layer of silicon power respectively, wherein the middle layer is a liquid layer. The finishing agent is prepared by mixing a solvent and surface modifier according to a principle of 99 to 70 percent of solvent and 1 to 30 percent of surface modifier. The content of the residual