The invention relates to the technical field of
hazardous waste resource utilization, in particular to a method for recycling overhaul
slag and
chromium-containing aluminum mud. The overhaul
slag contains
fluoride,
cyanide and carbon, the
chromium-containing aluminum mud contains aluminum and
hexavalent chromium, and the method comprises the following steps: carrying out
redox reaction on inorganic acid, the
chromium-containing aluminum mud and the overhaul
slag to obtain a decyanation material containing
fluoride, carbon, aluminum and chromium; carrying out a
precipitation reaction on the decyanation material by using a
calcium-containing alkaline
oxide to obtain a
precipitation material containing chromium, aluminum, carbon and
fluorine; carrying out chlorination reaction on the
precipitation material by using preheated
chlorine to obtain aluminum-containing chlorinated
flue gas and chromium-containing chlorinated slag; separating and purifying the aluminum-containing chlorinated
flue gas to obtain an aluminum-containing
solid phase; and washing the chromium-containing chlorination slag to obtain a trivalent chromium-containing solution. According to the method, the chromium-containing aluminum mud and the overhaul slag are used as raw materials, and the removal effect of toxic elements in the overhaul slag and the chromium-containing aluminum mud and the
recovery rate of valuable elements such as aluminum and chromium can be synchronously improved through the oxidation-reduction reaction, the precipitation reaction and the chlorination reaction.