Improvement of Technology of Processing of Persistent Gold-Bearing Ores and Concentrates using Oxidative Burning
Yusupkhodjayev A.A.1, Berdiyarov B.T.2, Matkarimov S.T.3, Radjabov A.I.4, Radjabova G.I.5
1Yusupkhodjayev Anvar Abdullayevich, Professor of department, Department of Metallurgy, Tashkent State Technical University, Tashkent, Uzbekistan.
2Berdiyarov Bakhriddin Tilovkabulovich, Head of department, PhD, Department of Metallurgy, Tashkent State Technical University, Tashkent, Uzbekistan.
3Matkarimov Sokhibjon Turdaliyevich*, Assistant professor, PhD, Department of Metallurgy, Tashkent State Technical University, Tashkent, Uzbekistan.
4Radjabov Adiz Ilkhomjonovich, Master student of Department of Metallurgy, Tashkent State Technical University, Tashkent, Uzbekistan.
5Radjabova Guzal Ilkhomjonovna, Bachalor student of Department of Metallurgy, Tashkent State Technical University, Tashkent, Uzbekistan.
Manuscript received on November 22, 2019. | Revised Manuscript received on December 15, 2019. | Manuscript published on December 30, 2019. | PP: 4793-4786 | Volume-9 Issue-2, December, 2019. | Retrieval Number: B3935129219/2019©BEIESP | DOI: 10.35940/ijeat.B3935.129219
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The article considers issues of improvement of the technology of processing of persistent gold-bearing ores and concentrates. The initial raw material is proposed to be subjected to oxidative roasting before cyanation. This is due to the fact that in persistent ores gold is found in such minerals as pyrite, chalcopyrite, arsenopyrite, etc. In turn, these minerals are surrounded by a layer of coal, which significantly reduces the efficiency of gold cyanation. Under oxidative firing conditions, coal is proven to burn by oxygen blowing, and minerals are decomposed into constituent components. In addition, under high temperature conditions, mineral grains are decripted due to their uneven chemical expansion. At the same time, numerous pores and cracks appear in the solid body, through which cyanides penetrate to gold minerals. All this creates good conditions for intensification of the process of extraction of noble minerals from the raw materials.
Keywords: Persistent gold-bearing ores, concentrates, oxidative roasting, pyrite, chalcopyrite, arsenopyrite, coal, processing efficiency, decomposition of minerals, thermal decription.