Method for preparing tungsten carbide and cobalt chloride by tungsten-containing waste

Abstract

The invention discloses a method for preparing tungsten carbide and cobalt chloride by tungsten-containing waste. The method comprises the following steps: adding water into tungsten-cobalt waste for ball milling; dissolving out metal impurities in the tungsten-cobalt waste with hydrochloric acid; adding water to stir, adding a catalyst and a defoaming agent, and keeping on reacting; performing acid pickling, removing supernatant, performing filter-pressing on lower slurry, washing filter residue tungsten sulfate with clean water for multiple times, and drying; adding sodium carbonate into the pickling solution, adding iron powder, filtering copper residues, adding sodium sulfate, hydrogen peroxide and sodium carbonate into the copper-removed solution to precipitate and separate iron in a mode of sodium jarosite, filtering iron residues, adding barium chloride into the iron-removed solution, precipitating sulfate ions, performing filter-pressing, pumping filtrate into a graphite crucible for evaporating and concentrating, cooling and crystallizing. The method is simple in process and convenient to operate, the tungsten-cobalt waste can be recycled, the tungsten-cobalt recovery rate is high, and energy consumption is low; and the whole process realizes zero emission of waste water, can be used for effectively treating waste gas, and is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of tungsten recycling, in particular to a method for preparing tungsten carbide and cobalt chloride from tungsten-containing waste materials and grinding materials. Background technique [0002] Metal tungsten and cobalt are important additives in cemented carbide. With the rapid development of cemented carbide in my country, the contradiction between the increasing shortage of tungsten and cobalt resources and the increasing demand has become more and more prominent. The recycling and utilization of tungsten and cobalt resources has become more and more popular. attention. From the currently published patents, the recovery of tungsten and cobalt is mostly produced from waste hard alloys by electrolysis, such as "a method for recovering tungsten carbide from waste hard alloys with the patent number CN201310666098", this method is Separation of cobalt and tungsten carbide by adding acid and electrolysis has g...

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Problems solved by technology

From the currently published patents, the recovery of tungsten and cobalt is mostly produced from waste hard alloys by electrolysis, such as "a method for recovering tungsten carbide from waste hard alloys with the patent number CN201310666098", this method is Separation of cobalt and tungsten carbide by adding acid and electrolysis has great environmental pollution and high energy consumption; there are also tungsten carbide produced by using waste tungsten cutting materials, such as "a method for producing tungsten carbide from waste tungsten cutting materials whose patent number is CN104386697A", This method is to use waste tungsten cutting materials to produce tungsten powder by passing hydrogen at high temperature after ball milling, and then add carbon to produce tungsten carbide at high temperature, but the source of raw materials is limited and the price is high. Tungsten has limited economic benefits

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