Effect of preliminary mechanical manganese tungstate activation on the kinetics of its decomposition by sulfuric acid

Effect of mechanical manganese tungstate activation on the rate of its decomposition by the sulfuric acid has been investigated. Activation is carried out in the laboratory centrifugal planetary grinder (CPG) of periodic action operating under the impact-wearing down mode with centrifugal acceleration of balls with ∼ 5 mm in diameter (alloy VK-8) ∼ 25 g. ''Dry'' activation (grinding in the air) has been carried out at the ratio of balls to the concentrate by mass 1050:50 g; ''wet'' activation (grinding in water pulp) - at the ratio of balls : concentrate : water by mass 1000:50:50 g. Time of activation varies from 5 to 15 min. Grinding of manganese tungstate concentrates in the apparatuses of the CPG type both in the air and in water pulp is shown to lead to deep structure changes in manganese tungstate activated the further process of concentrate decomposition by the sulfuric acid. Sharp increase of rate and degree of manganese tungstate concentrates decomposition by sulfuric acid solutions has been established on the basis of the kinetics investigation that opens the way for application of decomposition by the sulfuric acid during tungsten raw material reprocessing