Thermogravimetric Study of Oxidation Firing of Rhenium- and Osmium-Containing Lead Sludge
Berdikulova F.A. Sydykov A.O. Zharmenov A.A. Terlikbayeva A.Z. Seidakhmetova N.M.
January 2021Springer
Metallurgist
2021#64Issue 9-101096 - 1102 pp.
Results are provided for thermal and thermogravimetric studies of lead sludge in the presence of and without oxidizing agents in order to determine the thermally active part of the charge composition. It is shown that during oxidation firing of lead sludge the process begins with charge dewatering and organic compound decomposition, and rare metal oxidation commences after complete destruction of organic compounds. Addition of sodium nitrate or calcium hypochlorite oxidizing agents provides complete oxidation of rhenium and osmium in the range of 400–650°C with the subsequent extraction of osmium into sublimate and concentration of rhenium in the form of perrhenate compounds in the ash. In this case decomposition of organic substances proceeds in parallel with oxidation reactions of rare metals without affecting their oxidation.
osmium-containing lead sludge , oxidative calcination , rhenium- , thermal analysis
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RGP National Center for Comprehensive Treatment of Mineral Raw Material of the Kazakhstan Republic, Almaty, Kazakhstan
RGP National Center for Comprehensive Treatment of Mineral Raw Material of the Kazakhstan Republic
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