分银炉富氧精炼贵铅梯级脱杂试验研究

基于贵铅中杂质元素与氧亲和力的差异，采用富氧熔炼技术梯级脱除分银炉内贵铅中的杂质，考察氧气浓度对分银炉氧化精炼脱砷锑段、脱铋段、脱铜段的炉期、炉渣、脱杂速率的影响。结果表明：在脱砷锑段氧气浓度25%～30%、脱铋段氧气浓度50%～70%、脱铜段氧气浓度70%～88%的条件下，脱砷锑段、脱铋段、脱铜段的炉期分别为2.48、2.48、0.81 d,炉渣分别为0.78、4.77、0.52 t,砷、锑、铋、铜脱除速率分别为8.75、43.75、80.00、27.34 kg/h;贵铅在分银炉上采用富氧精炼梯级脱杂，可缩短分银炉炉期2～3 d,提高分银炉的处理能力，降低银精炼生产作业成本。

Experimental exploration of strong oxidation refining in silver separation furnace

Based on the mechanism of preferential oxidation of impurity elements in precious lead under oxidation conditions, this paper realizes the oxidation volatilization or slag removal of impurity elements, so as to achieve the purpose of silver purification. To explore the industrial test of step removal of arsenic, antimony, bismuth and copper by strong oxidation refining under different oxygen concentration in silver separation furnace, so as to accelerate the oxidation and volatilization of impurity elements and slag forming speed and shorten the furnace life. The results show that when the oxygen concentration is controlled at 25 ~ 30%, the furnace period of arsenic and antimony removal is the shortest; When the oxygen concentration is controlled at 30 ~ 50%, the furnace period of bismuth removal is the shortest; When the oxygen concentration is controlled at 88%, the copper removal furnace period is the shortest. Through the optimal control of oxidation refining step impurity removal in silver separation furnace, the furnace life can be shortened by 2 ~ 3 days.