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THE COMPOSITION OF SECONDARY TIN AND ITS HARDNESS
Abstract
Tin is widely used in the electro-technical industry, mainly for the production of the solders and tin-sheets. Resources for the production of primary tin are currently limited. Therefore, the importance of secondary methods - the recovery of tin from waste - is growing. However, the recycling of tin is associated with many technological, economic and environmental problems. It is usually energy-intensive. One of the compromising methods is "dilution" - secondary tin is mixed with high purity primary tin. However, many fine intermetallic phases remain in the recycled tin, which has been purified by this method. The amount and composition of these phases depend on the secondary elements present. They affect the mechanical properties of the final product, including hardness. The purpose of this study is to identify relationships between the composition of "diluted" tin obtained by spectrometers, and its hardness. The relationship was calculated by correlation analysis and subsequently by linear regression. The result is equations that allow with strong probability to calculate the relationship between the content of Cu, Pb, Cr, Ti, Ni, Sb and Au and the hardness measured by the Vickers method.
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