Method for separating electrolyte in aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon

The invention relates to a method for separating electrolyte in an aluminum electrolysis waste cathode carbon block and synchronously producing metal silicon, and belongs to the technical field of nonferrous metallurgy. The method comprises the following steps: crushing an aluminum electrolysis waste cathode carbon block into waste cathode carbon particles, sequentially carrying out water washing, screening, drying and grinding silica to obtain silica particles, and uniformly mixing the waste cathode carbon particles and the silica particles to obtain a mixture A; and reacting the mixture A at 1450-1600 DEG C under a vacuum condition for 1-5 hours, and performing solid-liquid-gas three-phase separation to obtain gas-phase electrolyte, liquid metal silicon and solid slag. According to the method, silicon dioxide is subjected to carbon thermal reduction at the temperature of 1450-1600 DEG C under the vacuum condition through waste cathode carbon particles to obtain metal silicon, meanwhile, the gaseous electrol