Abstract: The tests on the application of sulfurous acid in waste acid and SO₂ in flue gas to the removal of arsenic from waste acid,using iron-carbon bed as carriers has been accomplished. Test results show that under the optimum iron carbon ratio condition 1:1,the presence of sulfurous acid in waste acid is not enough to completely precipitate arsenic in the waste acid,i.e. only about 40% of arsenic could be removed. Either adding Na₂SO₃ or inletting SO₂ gas into the waste acid can effectively improve the removing rate of arsenic. In comparison,the inlet of SO₂ gas is better than the addition of Na₂SO₃. The optimum reaction time and reaction temperature of the waste acid in the iron-carbon bed are 2-5 h and 0-60℃,respectively.

Key words: waste acid, arsenic, iron-carbon bed, flue gas, SO₂

摘要： 进行了以铁碳床为载体，利用污酸中的亚硫酸及烟气中SO₂去除污酸中砷的试验。试验结果表明，在最佳铁碳比1∶1条件下，污酸中存在的亚硫酸不足以完全沉淀污酸中的砷，只能去除约40%的砷；在污酸中补加Na₂SO₃或通入SO₂气体都能有效地提高砷的去除率，相较而言，补充SO₂气体要优于补加Na₂SO₃；污酸在铁碳床中的适宜反应时间及反应温度分别为2～5 h及0～60℃。

关键词: 污酸, 砷, 铁碳床, 烟气, 二氧化硫

CLC Number: 

• X703