Copper And Arsenic Antimony Alloy Research Of Vacuum Distillation

The copper has found wide application and is always one of indispensable and important raw materials in the electrical industry, chemical industry, light industry, machinery manufacturing, transportation, electronic communication, military, and so on. A lot of master alloys and residues with high copper are producted in the metallurgical industry. With the increasingly aggravating pressure of resource shortage and environment, it is very significative to recover copper from such alloys in an efficient and environmentally friendly manner.This paper first chose the vacuum distillation to process the Cu-As-Sb multi-component alloy. Feasibility of processing Cu-As-Sb multi-component alloy to remove impurity and enrich valuable metal Cu by vacuum distillation was theoretically analyzed.The effects of distillation temperature and distillation time on the distillation effect were studied. The experimental results show that on the condition of system pressure20-30Pa, distillation temperature1400℃, distillation time150min, Cu content in the residue is82.8%with the direct recovery rate about92%. The Ag content in the residue is0.010%, which shows Ag has been almost completely separated from Cu. Ag content in the volatile is0.88%with a direct recovering rate about93%. As a conclusion, separation and enrichment of Ag are significant. Contents of As, Sb, Pb, Sn in the residue are respectively3.0%,5.2%,0.050%,2.96%and their removal rates are respectively89.10%,78.06%,99.72%,28.10%.Considering Cu enrichment effect of vacuum distillation, a bit of improvement had been done:add some sulphur into alloy, chang metals to be metal sulphides, and then vacuum distillation. Feasibility of processing Cu-As-Sb multi-component alloy to remove impurity and enrich valuable metal Cu by sulfuration-vacuum distillation was theoretically analyzed. The effects of addition of sulphur, distillation temperature and distillation time on the distillation effect were studied. The experimental results show that reaction could occur between S and the Cu-As, Cu-Sb compounds and As, Sb could be reduced to be single metal. Sn can be vulcanized to become SnS by the sulphur and volatilize in the SnS state because volatilization rate of SnS is much larger than its thermal decomposition rate in the high temperature and vacuum environment. The residue is mainly Cu sulphide in which content of Cu is about78.37%and the direct recovery rate of Cu is97.60%when the multi-component alloy is distilled for30min at1200℃,5～15Pa and200%overcharge percentage of sulphur. Contents of Pb, Sb, Sn, As, Ag in the residue are respectively0.0058%,1.02%,0.0023%,0.039%,0.27%and their removal rates are respectively99.96%,95.17%,99.94%,99.84%,51.96%. Cu enrichment effect of sulfuration-vacuum distillation is significantly better than vacuum distillation. The residue can be converted into anode copper which can be applied to electrolytic refining.