China Nonferrous Metallurgy

Given that SnO is volatile and rotary kiln is suitable for handling solid materials, tests are conducted to explore the reduction volatilization process of refractory low-grade tin in rotary kiln, including melting point determination test, comparison test between pelletizing and not pelletizing, feed pelletizing orthogonal test and continuous feeding and discharging test. Conclusions drawn from these tests are that according to theoretical analysis and melting point determination test, the proper temperature of reduction volatilization should be controlled at 900~1100℃, and the adhesive CaO is beneficial to increasing the melting point of low-grade tin middlings and reduction volatilization of tin. And this process can realize effective separation of tin from other impurities and a volatilization rate of over 88.85%.