硫酸铅渣直接还原熔炼工艺渣含金属的控制

Control of Metal Content in Slag of Direct Reduction Smelting of Lead Sulfate Slag

常规铅冶炼原料以硫化矿或氧化矿为主,其成分相对单一,工艺技术成熟可靠,通过烧结-还原熔炼后,利用前床可达到较低的渣含金属从而实现较好的经济效益,而铜冶炼烟尘滤渣(以下称硫酸铅渣)成分复杂多变,且有害杂质较多,经过直接还原熔炼理后,其渣含金属波动仍然较大。本文以云南省某冶炼单位生产实践为实例,对硫酸铅渣直接还原熔炼后炉渣物相、渣型和生产控制等方面进行分析和实践,以确保渣含金属在较低水平,提升该厂的金属直收率。

Conventional lead smelting raw materials are mainly sulphide ore or oxide ore, whose composition is relatively single and the technology is mature and reliable. After sintering-reduction smelting, lower metal content of slag can be achieved in the front bed to achieve better economic benefits, while copper smelting fume filter slag (hereinafter referred to as lead sulphate slag) has complex composition and more harmful impurities, which is melted by direct reduction. After that, the fluctuation of metal content in the slag is still large. Taking the production practice of a smelting unit in Yunnan Province as an example, the slag phase, slag type and production control after direct reduction smelting of lead sulfate slag are analyzed and practiced in order to ensure that the slag contains metal at a lower level and enhance the direct metal yield of the plant.