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 0¸700, and zinc is 0¸100 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.