Method for recycling metal from bismuth slag

The invention discloses a method for recycling metal from bismuth slag. The method includes the steps that the bismuth slag serves as the raw material, leaching is conducted on the bismuth slag through a sulfuric acid solution so that copper can be leached from the bismuth slag, and a first leaching agent and first filter slag are obtained; the first leaching agent is subjected to rotational flow electrolysis, and electrolytic copper and a first waste electrolyte are obtained; a hydrochloric acid solution is used for leaching the first filter slag so that bismuth can be leached from the filter slag, and a second leaching agent and second filter slag are obtained; and the second leaching agent is subjected to rotational flow electrolysis, and bismuth powder and a second waste electrolyte are obtained. The method has the beneficial effects that leaching is conducted through different kinds of acid, copper and bismuth separation is achieved, fractional hydrolysis work is replaced, mutual consumption of acid or alkali is avoided, and the input of material cost is reduced; the technical merits of rotational electrolysis are utilized, production efficiency is improved, volatilization of acid mist is avoided, and the operation environment is improved; alkali does not need to be added for neutralizing or scrap iron replacement is not needed, no waste water or waste slag is generated, and the environment pressure is greatly reduced.