Sustainable Mining and Metallurgy

In view of the disadvantages of the traditional wet gold refining process, such as the excessive silver content of gold products, the pressure on the environment caused by the environmental protection recovery of acid-containing wastewater, nitrogen oxides, silver chloride and other by-products, the vacuum distillation technology was used for gold refining, and the experimental research and industrial practice were carried out. The technical advantages of gold vacuum refining and the problems found in production practice were briefly described, and the prospect of gold vacuum refining technology was prospected. The experimental results show that under the conditions of distillation temperature of 1300℃, distillation time of 60min and gold and silver alloy amount of 6kg, the gold refining effect is the best, the purity of the product is high, up to 92.89%, and the direct yield of the product is the highest, reaching 99.57%. The feasibility of gold refining by vacuum distillation technology was verified by experiments. Industrial practice shows that the recovery rate of gold and silver is more than 99%.