Recovery of bismuth and antimony metals from pressure‐leaching slag

The leaching behavior of metals from a pressure‐leaching slag was investigated using a desulphurization‐leaching‐hydrolysis process for the recovery of bismuth and antimony. Various parameters were studied, including the amount of acid added, temperature, time, addition of NaCl and solid‐liquid ratio in the leaching process. The experimental results show that the contents of bismuth and antimony are mostly enriched in the process of kerosene desulphurization. More than 98% Sb and 96% Bi are extracted under the determined conditions. In the process of hydrolysis, the precipitation rates of bismuth and antimony are 97.80% and 94.59%, respectively. Under the optimum experimental conditions, the recovery rate of bismuth and antimony can be up to 95.80% and 90.80%, respectively.