2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 3: Non-ferrous & Iron_Steel
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 522 pages |
| ISBN: | 978-1-987820-05-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The development of a new environmentally-friendly technology for integrated processing of gold-bearing antimony ores
Jondo Bagdavadze1; Rusudan Chagelishvili 2; Tsisana Gagnidze2; Aleksandre Kandelaki1; Zurab Tsikaridze1; Ketevan Ukleba1;1FERDINAND TAVADZE INSTITUTE OF METALLURGY AND MATERIALS SCIENCE, Tbilisi, Georgia; 2IVANE JAVAKHISHVILI TBILISI STATE UNIVERSITY, RAFAEL AGLADZE INSTITUTE OF INORGANIC CHEMISTRY AND ELECTROCHEMISTRY, Tbilisi, Georgia;
Type of Paper: Regular
Id Paper: 10
Topic: 3
Abstract:
A new technology for integrated processing of gold-bearing antimony ores has been developed in order to solve certain problems in the industry of gold-mining. The technology based on vacuum thermal processes allows not only extraction of gold but production of associated materials - antimony sulfide (Sb2S3) and metallic antimony (Sb) as well.
In this connection there were fulfilled some theoretical and application-oriented works, in particular, (computer simulated) estimation methods for determining values of thermodynamic functions were developed and yet unknown values of thermodynamic functions of some compounds (FeSb, FeSb2, AlSb, etc.) were established; thermodynamic analysis of the (Sb-S); (Sb-S-Fe); (Sb-S-Al) systems was conducted. The estimation results are presented graphically (temperature dependence of the content of components).
Kinetics of the process of antimony sulfide extraction from the ores was studied for different fractions. Optimal conditions for obtaining Sb2S3 were determined.
Commercially pure (~95 mass %) antimony was prepared via iron reduction of Sb under vacuum with subsequent sublimation and condensation. Elimination of arsenic and sulfur from the metallic antimony was realized by vacuum heat treatment (Ð a‰…10-5 ÐœPа). The resulting product was a high-purity metallic Sb (~ 99.2 mas. %).
An alternative method was used for the extraction of precious metals (gold, silver): the method provides electrochemical procession of ore with using chloride electrolyte comprising selective organic gold complexing agent - thiourea [CS(NH2)2]. An appropriate device was designed and recommendations were issued.