A method for processing of secondary tungsten-and cobalt-containing materials is suggested. The optimal parameters of the processes involved and the consumption of chemicals are determined.Processing of secondary tungsten-containing raw materials, and primarily the recovery of tungsten and cobalt from worn-out drilling and cutting tools, is an urgent problem.Hydrometalurgical, pyrometallurgical, physical, and electrochemical methods for processing of tungsten3cobalt alloys of the VK type are known [135]. These processes are low-intensive, have low selectivity, and involve discharge of noxious substances (nitrogen oxides, hydrogen fluoride) into the atmosphere. The existing techniques are mainly applicable to processing of lump scrap of cutting tools, but show low efficiency in recovery of tungsten and cobalt from worn-out roller drill bits used in mining and geological prospecting. Chemical and electrochemical methods performed in melts based on alkali metal hydroxides show promise for processing of raw materials of this kind [6 312].
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