Method for separating tin from tin-lead-stibium-arsenic alloy by vacuum distillation

The invention relates to a method for separating tin from tin-lead-stibium-arsenic alloy by vacuum distillation, belonging to the technical field of vacuum metallurgy of non-ferrous metals. The method comprises the following steps: melting the tin-lead-stibium-arsenic alloy to obtain tin-lead-stibium-arsenic alloy liquid at first; and continuously and uniformly feeding the obtained tin-lead-stibium-arsenic alloy liquid into a continuous vacuum furnace by adopting a constant-current feeding method to carry out vacuum distillation so as to obtain residues, namely crude tin or tin-lead-stibium alloy and tin-lead-stibium-arsenic metal vapor entering a condenser, and controlling the temperature of the condenser and the condensation section number according to the concentration of tin vapor in the tin-lead-stibium-arsenic metal vapor, thereby obtaining tin-lead-stibium alloy, lead-stibium alloy and crude arsenic. According to the method, a tin-lead-stibium-arsenic alloy raw material is directly separated by adopting the continuous vacuum furnace; the universality to raw materials is higher; the lead-stibium alloy with the tin content less than 0.2wt%, the crude tin with the tin content above 98wt% and crude arsenic with the arsenic content above 90wt% can be obtained; and therefore, high-efficiency separation of the tin-lead-stibium-arsenic alloy is realized.