PROCESSING OF W-Ni-Fe SCRAP TO RECEIVE TUNGSTEN POWDER
DOI:
https://doi.org/10.15421/jchemtech.v32i2.302114Keywords:
powdered tungsten; binder phase; self-grinding; recycling; leaching degree.Abstract
The work is devoted to the actual topic of processing scrap of the strategic alloy W-Ni-Fe, which is used in the production of armor-piercing projectiles. The recycling of tungsten and other alloy components solves the problem of scarcity and preciousness of these metals. In this work, the influence of the concentration of hydrochloric acid and hydrogen peroxide, as components of the leaching solution, on the degree of leaching of the binding phase was investigated. It was established that an increase in the concentration of both components leads to an increase in the rate of both the leaching process and the course of side processes, which lead to an untargeted consumption of reagents. The results of the experimental studies show that the most effective is the use of hydrochloric acid with a concentration of 2 mol/l and hydrogen peroxide with a concentration of 2 mol/l. The problem of catalytic decomposition of hydrogen peroxide is solved by carrying out the leaching process at a low temperature (about -5 °C). A new method of leaching W-Ni-Fe alloy to obtain high-quality tungsten powder is proposed. Intensification of the process is achieved by organizing leaching under self-grinding conditions with continuous mechanical renewal of the surface that is in contact with the acid-oxidizing leaching solution.
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