低银铋熔体加锌自动脱银工艺研究

Study on Automatic Desilverization from Low Silver-Bearing Bismuth Molten by Adding Zinc

利用低银铋熔体通过熔融锌液柱而自动脱银,主要考察锌液柱高度、温度及时间对脱银效果的影响。结果表明,在锌液柱高度为12cm、温度773K及时间120min的条件下,可将含Ag 0.06%的铋熔体的含银量降至10μg/g左右,脱银率98.01%;也可以将含Ag 0.18%的铋熔体含银量降至33μg/g左右,脱银率93.45%。本工艺具有消耗低、劳动强度小、环境友好等优点。

The silver in low silver-bearing bismuth molten was removed by being passed through zinc liquid column. The effects of height of zinc liquid column, temperature and time on desilverization were studied. The results show that the silver mass content in bismuth molten reduces from 0.06 % to 10μg/g with the removal rate of silver of 98.01% and from 0. 18% to 33 μg/g with the removal rate of silver of 93.45% un- der the conditions including height of zinc liquid column of 12 cm, temperature of 500 ℃ and time of 120 min. The processes have the advantages of low consumption, low labor strength and environment friendli- ness.