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.

中文翻译：

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含铼锇铅渣氧化燃烧的热重研究

提供了在存在和不存在氧化剂的情况下对铅污泥进行热和热重研究的结果，以确定装料成分的热活性部分。结果表明，铅污泥氧化烧成过程开始于电荷脱水和有机化合物分解，稀有金属氧化在有机化合物完全破坏后开始。添加硝酸钠或次氯酸钙氧化剂可使铼和锇在 400-650°C 范围内完全氧化，随后将锇萃取成升华物，并在灰烬中以高铼酸盐化合物的形式浓缩铼。在这种情况下，有机物质的分解与稀有金属的氧化反应同时进行，而不会影响它们的氧化。