폐 솔더 잉곳으로부터 전해정련에 의한 고순도 주석 생산
Produce of High Purity Tin from Spent Solder by Electro Refining
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초록
폐 솔더로부터 제조된 조주석을 전해 정련을 통하여 고순도 주석으로 제조하기 위한 연구를 수행하였다. 주석 전해정련 시 인가전압이 0.2V일 때 99.98%의 주석이 얻어지며 0.3V로 생산 시 99.92%로 3N 이상의 주석이 얻어진다. 생산량과 주석의 순도를 고려한 전류밀도는 100~120 A/m2이며 이때 전류효율은 94% 이상이었다. 전해액중에 황산이 20~25g/L로 유지될 경우 생산된 전해주석에서 납이 100ppm 이하로 포함됨을 알 수 있었다. 슬라임의 XRD 분석결과 양극에 포함된 Cu, Ag 등은 Cu6Sn5, Ag3Sn등의 합금상으로 분석되었으며 Pb의 경우는 PbSO4의 화합물 형태로 슬라임을 형성하는 것을 알 수 있었다.
Abstract
The high pure tin production was conducted from crude-tin containing waste solder by electro-refining process. The electrorefining process maintained at 0.2V produced tin with purity of 99.98%, whereas a little increase of voltage to 0.3 V resulted tin purity of 99.92%. The high pure tin of 3N in the present process was produced by fixing the voltage at 0.3V. Considering the high pure tin production, the current density was maintained within 100 - 120 A/m2 with current efficiency of 94%. Addition of sulfuric acid of 20 ~ 25 g/L to the electrolyte solution was performed in order to keep Pb (lead) concentration below 100 mg/ L in the final tin product. The anode slime generated during electro refining process was analyzed by X-ray diffraction (XRD) study to understand the phases of impurities in it. It detected the presence of Cu and Ag in the slime as in the form of Cu6Sn5, Ag3Sn, whereas Pb occurred as PbSO4 compound.
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