Abstract:The factors affecting the leaching rate of antimony in the process of preparing sodium antimonate from purified slag are analyzed. The effects of leaching reagents and process parameters on the leaching rate of antimony are systematically studied. The optimum process parameters are determined as follows: 28% liquid NaHS, 1.2 times of the theoretical amount, reaction temperature 102 ℃, free alkalinity 40g / L, liquid-solid ratio 4∶1, reaction time 2 hours. Production practice shows that this process is suitable for antimony leaching, and the leaching rate of antimony from hydrolysis residue is increased from 69.3% to 95.8%, which reduces the output of intermediate materials and saves production cost.