原矿焙烧烟气中二氧化硫的治理研究

Study on treatment of SO_2 in flue gas from whole ore roasting

针对某原矿焙烧工艺产生的烟气进行了治理试验研究,以期选择适宜治理方法。小型试验研究结果表明:采用原矿焙烧,砷可以固化在焙砂中,烟气中SO2浓度达不到环保排放标准;采用干式治理方法,用X碱盐固化吸收烟气中SO2,效果较好,可达到排放标准;采用湿式治理方法,用碱液吸收烟气中SO2,亦可达到排放标准。干式治理方法与湿式治理方法比较,技术上均为可行,但湿式治理方法具有工艺流程短、成本低、易实施等特点。

In order to properly select a treatment method for flue gas from whole ore roasting, tests and study were carried out. Bench scale test indicates that the intensity of SO2 fails to meet the discharging standard because arsenic is trapped in the calcine in the process of whole ore roasting. Employing dry-type treatment, alkali salt absorbs SO2 in flue gas to an extent that reaches the discharging standard, while for wet-type treatment method, alkali liquor absorbs SO2 also to an acceptable extent. The two methods are technically feasible while wet- type treatment has comparatively short circuh, less cost and easier access.