Method for efficiently separating and recovering tungsten from alkaline leaching tungsten slag

Abstract

The invention discloses a method for efficiently separating and recovering tungsten from alkaline leaching tungsten slag. The method comprises the following steps that after the alkaline leaching tungsten slag, mixed salt and a combustion-supporting medium are uniformly mixed, the mixture is roasted and smelted in a muffle furnace, a roasted material obtained by roasting and smelting is subjectedto crushing, dry grinding, screening and then water leaching, and sodium tungstate in the roasted material is separated and enriched in a water phase so as to be recovered. According to the method, ananhydrous sodium sulfate and sodium carbonate mixed salt system is adopted, a weak oxidation environment is provided in a roasting process, oxidation and recovery of low-valent tungsten are facilitated, the process route of tungsten recovery is shortened, and the productivity is improved; meanwhile, the combustion-supporting medium is added into the materials, the heat conduction performance of amaterial layer is effectively improved, the phenomenon of uneven heating of different parts of the material layer is reduced, and the tungsten recovery rate is improved; and the tungstate in the roasted material is enriched by adopting a water leaching method, the leaching rate is high, the leaching cost is low, environmental pollution is small, and the leaching slag can be subjected to subsequent separation and recovery according to the content of valuable elements such as cobalt and nickel.

Description

technical field [0001] The invention belongs to the fields of environmental protection and resource recycling, and relates to a technology for recycling resources containing secondary tungsten, in particular to a method for efficiently separating and recovering tungsten from alkali leaching tungsten slag. Background technique [0002] my country is a country with large tungsten resources. However, with the development of economy and technology in recent years, the demand for tungsten products at home and abroad has increased sharply. The output of tungsten concentrates in my country accounts for more than 80% of the world's total output. 16 years. Excessive exploitation of tungsten resources will seriously restrict the sustainable development of society. Therefore, vigorously developing secondary tungsten resource recycling and replacing raw ore mining with resource recycling is the fundamental way to solve the shortage of tungsten resources. For the alkali leaching tungsten...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide a method for efficiently separating and recovering tungsten from alkali leaching tungsten slag, aiming to solve the problem of high cost, high energy consumption in the process and local material problems caused by insufficient roasting temperature in the prior art. The problem of incomplete reaction ensures the efficient recovery and reuse of tungsten resources in alkali leaching tungsten slag, promotes the technological progress of secondary tungsten resources recycling technology, effectively alleviates the shortage of raw materials for tungsten resources in my country, and meets the national call for energy conservation and emission reduction In line with the market demand, it has considerable economic value and social and environmental significance

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