Stannous chloride (SnCl2) and stannous sulfate (SnSO4) synthesis from tin powderization waste

Abstract

The necessity of finding a way to utilize Sn metal from tin powderization waste as effectively and efficiently as possible has risen because of the large number of industrial by-products of Sn waste and the broad applications of tin chemicals in the world. Stannous chloride (SnCl₂) and stannous sulfate (SnSO₄) are tin-derived compounds in which their applications are in various fields, and one of which is catalysts. Catalyst products produced from the two compounds are STO (Sulfated Tin Oxide) catalyst. In this study, tin powderization waste was used as raw material for the synthesis of SnCl₂ and SnSO₄. The purpose of using tin waste is an effort to create the Sustainable Development Goals (SDG) program launched by the United Nations to obtain a sustainable consumption and production system. Tin powder from the off-spec product of the tin powderization process can be used as raw material to manufacture tin-derived chemical compounds. Overall, the process of developing tin products will produce a non-waste system (zero waste). The optimum conditions to synthesize SnCl₂ are as follows; the tin powder particle size is 500 mesh with HCl 12 M at 80°C with a yield percentage of 95%. The synthesis of SnSO₄ with the reaction of SnCl₂ + (NH₄)₂SO₄ can be carried out using stirring techniques. The results of the FT-IR spectrometer showed a spectrum of sulfate groups in the region ~ 1181 cm⁻¹.