Method for recycling gold from circular board

The invention discloses a method for recycling gold from a circuit board. The method comprises the following steps that 1, the paint on the surface of the circuit board is removed, and metal in the circuit board is exposed on the surface of the substrate of the circuit board; 2, the circuit board without paint is cleaned up; 3, acid etching is conducted on the cleaned up circuit board through an acid etching solution comprising sulfuric acid and an oxidizing agent, after acid etching, copper in the circuit board is leached in a copper sulfate mode, gold floats in the acid etching solution in a gold foil mode; 4, gold existing in the gold foil is obtained through separation. By the adoption of the technical scheme, the sulfuric acid and the oxidizing agent are used for corroding gold carriers such as copper, nickel and other metal, the purpose of separating gold from the circuit board is achieved. By the adoption of the method, the good gold extracting effect can be achieved without smashing the circuit board, nitrogen oxide pollution is avoided, the gold recovery rate is high, and the cost is low.