Kinetics of dissolution of copper-zinc alloy in nitric-sulfuric acid solutions

Studies were carried out on the dissolution of a copper-zinc alloy imitating a base substrate of an electron scrap containing noble metals in nitric-sulfuric acid solutions. A mathematical model is obtained that allows calculating the rate of copper and zinc transition to nitric-sulfuric solutions by varying the concentration of H+ ions from 1 to 4 g-ion / dm3 and NO3- ions from 0,5 to 1,0 g-ion / dm3. In the range of concentrations of H+ and NO3- ions studied, the maximum rate of copper transition into the solution is 6,5·10-5, and zinc is 4,5·10-5 kg / m2s. The equation of regression allowing to carry out a choice of conditions for proceeding with necessary speed of the chemical processes taking place in metallurgical practice is presented.