Abstract
Introduction. Most deposits of manganese ores in Kazakhstan are mined in an open way. This creates large waste dumps that are not disposed of and have a negative impact on the environment. Since these wastes contain various valuable components, they can be used as an alternative raw material source in the production of various inorganic materials. However, there is no practice of involving overburden waste in production in Kazakhstan. The purpose of this work is to study the process of leaching overburden waste from the Zhayrem deposit with various mineral acids and the possibility of using the resulting solutions as liquid mineral fertilizers enriched with trace elements. Results and discussion. The process of leaching overburden waste from the Zhayrem manganese ore deposit with various mineral acids was investigated. It has been shown that the optimal reagents of the leaching process are nitric and orthophosphoric acids. It was revealed that leaching of overburden waste with 10% solutions of these acids at Т: Ж = 1:25 and a temperature of 50 ° С leads to the formation of productive solutions that can be recommended for use as a basis for the production of liquid phosphorus or nitrogen fertilizers containing the trace element manganese.