Comprehensive utilization method of yellow phosphorus furnace slag

The invention provides a comprehensive utilization method of yellow phosphorus furnace slag. The method comprises the following steps of: adding yellow phosphorus furnace slag porphyrized to 80-120 meshes to a nitric acid solution the mass concentration of which is 5-20 percent to ensure that the mass ratio of solid to liquid is 1:(10-19); stirring for reacting and then filtering; washing, drying and calcining filter residues to obtain white carbon black; reacting filter liquid with sulfuric acid and then filtering; and drying the filter residues to obtain calcium sulfate, wherein the filter liquid can be recycled. In the invention, an effective approach capable of utilizing main constituents of Si and Ca in the yellow phosphorus furnace slag is developed, and the white carbon black the SiO2 content of which reaches 99 percent and a high-quality calcium sulfate product the CaSO4 content of which reaches 99 percent, which can meet the requirement of the market, are produced. The method not only can sufficiently utilize the yellow phosphorus furnace slag which is an industrial waste and change the waste into valuable things, but also is beneficial to reducing the pollution of the yellow phosphorus furnace slag to the environment, and meanwhile, the method can reduce the production cost of the while carbon black and the calcium sulfate to realize circular economy as well as save energy and reduce emissions.