![]() ![]() In order to obtain other Sn concentrations, a proportional amount of tin(II) sulphate was added. In the first test series, the original solution was enriched with tin to 6 g/dm 3 to resemble leachate before detinning by adding 5.43 g SnSO 4. In each test, 500 dm 3 of the solution was poured into the flask, except in the last tests, in which 2.5 dm 3 solution was investigated. The investigated detinned solution was obtained by leaching GeIn dross with sulphuric acid in accordance with the procedure described in the previous paper. It is estimated that no more than 3% of Ge contained in zinc concentrates is recovered worldwide. However, there is still huge room for the improvement of germanium recovery. Its main sources are ashes generated after the combustion of Ge-rich coals found in China and far-east Russia and residues of zinc metallurgy. Germanium does not occur in nature in the form of economically-mineable ores, but is recovered as a by-product. Over 100 tons of refined germanium is produced each year, and over 60% of the world’s production comes from China. It is applied in optical fibers, used for high-speed telecommunication, infrared optics for military applications, solar cells (mainly in artificial satellites), polymerization catalysts for the production of polyethylene terephthalate (PET), in plastic bottles and synthetic textiles, high brightness light emitting diodes (LEDs), transistors for high speed wireless telecommunication, γ-ray detectors, and phosphors. Germanium is a rare metalloid which is important to several sectors of the global industry. ![]()
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