Abstract
The article presents the results of thermochemical enrichment of waste copper tailings. Studies on sintering the concentrate with alkali have established the formation of silicate and sodium aluminosilicate. The extraction of silicon into the solution, depending on the sintering temperature in the range of 250-500°C, increases from 59,96% to 70,40%. After water leaching of cake under the following conditions: L:S = 3:1 temperature 60°C; duration of 60 minutes, the copper content in the cake increases on average 1,2 times.To isolate white soot from a silicate solution, carbon dioxide was used as a neutralizing agent. White soot was obtained by two-stage carbonization of a silicate solution with carbon dioxide in a recirculation system, bringing the pH to 9-10. The influence of the duration of deposition, temperature, and concentration of the silicate solution on the specific surface area (Ssp., m2/g) of white soot was studied. It has been established that with increasing carbonization time and solution temperature, the specific surface area of white soot decreases. It was found that at a temperature of 25°C, a process duration of 50 minutes and a final pH = 9,7 units. white soot is formed with a specific surface area of 200 m2/g.After removing aluminum oxide impurities with a sulfuric acid solution at a temperature of 80°C, white soot corresponding to the BS-100 grade was obtained.