Abstract
During the processing of lead containing products and polymetallic alloys the recovery of tin and antimony from technology of lead production is carried out by oxidation refining of decopperized lead with rich oxides (Sn, Sb ≥ 20%).Tin oxides are melted in a short-drum furnaces to lead bullion (> 96% Pb) and tin-rich (> 20% Sn) slag. The slag is melted in an ore-smelting furnace to obtain a Sn-Pb alloy of next composition, %: 56.1 Sn, 18.2 Pb, 14.6 Sb, 6.9 As, which is refined by vacuum distillation with production of rough tin (Sn ≥ 90%). The additional profit of rough tin obtainment (∼310 tons/year), compared with sales of tin slag, is about ∼1.3 million $/year.
 Keywords: lead, tin, antimony, melting, vacuum distillation
Highlights
At the second stage tin oxides derived from the oxidative refining of lead were melted in short-drum furnaces (SDF) to produce rough lead with a minimal content of impurities and industrial slag-matte product (ISMP) rich in tin and suitable for further processing
Rough lead of a high quality (96.4% of Pb) with an output of 99.3% of the initial metal content and ISMP with ∼21% of tin suitable for sale were obtained after melting of charge containing 60% of tin oxides, 24% of soda ash, 14.8% of sand and 1.2% of coke breeze
As a result of processing of Pb-containing raw materials according to the scheme of oxidative refining from antimony and tin using vacuum distillation, a commercial product with high consumer properties is obtained – tin rough, which can be used for the preparation of branded solders
Summary
Tin production showed that in comparison with common methods of separation and refining of base metals from the impurities, the vacuum distillation of polymetallic alloys and related industrial products of lead production is technologically acceptable and economically feasible, allowing the obtainment of commercial products of the required quality [1–8]. At the second stage tin oxides (above 30 tons) derived from the oxidative refining of lead were melted in short-drum furnaces (SDF) to produce rough lead with a minimal content of impurities and industrial slag-matte product (ISMP) rich in tin and suitable for further processing (or for sale).
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