Method for treating low-grade tungsten concentrate and tungsten slag

The invention discloses a method for treating low-grade tungsten concentrate and tungsten slag. The method comprises the steps of mixing low-grade tungsten concentrate or tungsten slag and coal powder with a reduction roasting enhancer, and then performing reduction roasting; grinding the product obtained through the reduction roasting, then performing neutral leaching to obtain a tungstate solution and leaching residues, and performing magnetic separation on the leaching residues by adopting a magnetic field so as to obtain iron concentrate and valuable metal tailings; removing silicon from the valuable metal tailings by using dilute hydrochloric acid and leaching out manganese from the valuable metal tailings by using concentrated hydrochloric acid in sequence, and then leaching out tantalum and niobium by using hydrofluoric acid to prepare tantalum and niobium products. By adopting the method, valuable elements including tungsten, iron, copper, manganese, bismuth, cobalt, tantalum, niobium and the like which are difficult to extract in the low-grade tungsten concentrate and tungsten slag can be efficiently enriched, separated and recovered effectively, so that the resource comprehensive utilization of the valuable elements in the low-grade tungsten concentrate or tungsten slag is realized; moreover, the method is simple in equipment, short in flow, simple and convenient in operation, is economical and reliable, and is favorable for industrial production.