Abstract
Tin-coated copper-clad steel wire scrap is a high value-added tin-coated waste derived from the production and replacement of electronic products. The existing methods for the treatment of tin-coated waste present shortcomings, such as a large amount of waste liquid treatment, high equipment anticorrosion costs and low tin recovery rate. In this work, pyrite is used as a sulfurizing agent, and under the condition of vacuum decomposition to produce sulfur vapor, sulfur vapor reacts with tin on the surface of CP wire scrap to form stannous sulfide. Stannous sulfide continues to volatilize under high vacuum temperature conditions, realizing the complete separation of tin and other metals. Under an FeS2 and Sn molar ratio of 1.8, reaction conditions of a temperature of 1323 K, holding time of 4 h, and pressure of 10 Pa, the direct yield of tin is 91.26%, and the purity of stannous sulfide is 98.12%. Clean and efficient recycling of tin plating on the surface of tin-coated copper-clad steel wire scrap was realized using this method, and the comprehensive utilization rate of secondary resources containing tin was enhanced.
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