有色金属冶炼工厂废气的主要特点是 SO_2浓度较低,因此多数工厂都未加利用,而直接排入大气中,这不但浪费了资源,而且恶化了厂区的卫生和劳动条件,危害厂区周围农作物的生长。关于废气中低浓度SO_2的利用问题,国内外已提出过不少方案,大多是采用吸收剂吸收法。至于低浓度 SO_2废气的返烟浓缩问题,国内亦曾进行过试验,取得了不少经验,结合 The main feature of non-ferrous metal smelter effluents is the low concentration of SO2, so most of the plants are unused and directly discharged into the atmosphere, which not only waste resources, but also aggravate the sanitation and working conditions of the plant and endanger the crops around the plant Grow. Regarding the utilization of low-concentration SO 2 in exhaust gas, many schemes have been put forward at home and abroad, and most of them have adopted the absorbent absorption method. As for the problem of the concentration of SO2 in low concentration, the tests have also been carried out in China and a great deal of experience has been obtained