硫铁矿制酸过程的废稀酸中砷及重金属去除研究
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摘要
以硫铁矿制酸过程所产生的酸性废水为研究对象,探讨了硫化剂-铁盐法去除该类酸性废水中砷及重金属元素的最佳工艺条件。结果显示,在硫化钠投加量为1.2 g/L、PFS投加量为0.8 g/L、p H值为2~3的条件下,经过静置、沉淀、过滤处理后,酸性废水中As、Pb、Cd、Cr、Hg的质量浓度分别降至0.310、0.270、0.001、0.004、0.012 mg/L,去除率依次为99.91%、96.78%、97.86%、97.02%、93.15%,处理后酸性废水的p H值仍能够保持在2.5~3.5,可回用于磷肥的工业生产中。该方法产生沉淀污泥量少,且能够有效避免二次污染,实现硫酸工业酸性废水的无害化、资源化和减量化。
Taking the acid wastewater from purification process during sulfuric acid production by pyrite as the research object, the optimal technological condition for sulfurizing reagent-ferric salt method removing arsenic and heavy metals from the said kind of acid wastewater was discussed. The results showed that, under the condition that the dosage of sodium sulphide and PFS were 1.2 and 0.8 g/L respectively, the p H value was 2-3,with the treatment of stewing, sedimentation and filtration, the mass concentrations of As, Pb, Cd, Cr and Hg in the acid wastewater decreased to 0.310, 0.270, 0.001, 0.004 and 0.012 mg/L respectively, and the removal rates were 99.91%, 96.78%, 97.86%, 97.02% and 93.15% respectively. The p H value of the treated acid wastewater maintained at 2.5-3.5, which could be reused in phosphate fertilizer production. The said method produced less precipitation sludge, which could effectively avoid secondary pollution and achieve the goal of ensuring acid wastewater from sulfuric acid industry be harmless, recycling and reducing.
Taking the acid wastewater from purification process during sulfuric acid production by pyrite as the research object, the optimal technological condition for sulfurizing reagent-ferric salt method removing arsenic and heavy metals from the said kind of acid wastewater was discussed. The results showed that, under the condition that the dosage of sodium sulphide and PFS were 1.2 and 0.8 g/L respectively, the p H value was 2-3,with the treatment of stewing, sedimentation and filtration, the mass concentrations of As, Pb, Cd, Cr and Hg in the acid wastewater decreased to 0.310, 0.270, 0.001, 0.004 and 0.012 mg/L respectively, and the removal rates were 99.91%, 96.78%, 97.86%, 97.02% and 93.15% respectively. The p H value of the treated acid wastewater maintained at 2.5-3.5, which could be reused in phosphate fertilizer production. The said method produced less precipitation sludge, which could effectively avoid secondary pollution and achieve the goal of ensuring acid wastewater from sulfuric acid industry be harmless, recycling and reducing.
引文
[1]李旺旺,牟林琳,毕亚凡.硫铁矿制酸净化工序废稀酸回用的探讨[J].工业用水与废水,2014,45(1):33-35.
[2]周晓梅.我国土壤污染因素分析与防治对策探讨[D].济南:山东大学,2011.
[3]常近时.高炉磷酸新工艺大幅降低磷肥重金属含量的环保意义[J].中国石油和化工,2012,(1):41-42.
[4]高小娟,王皤,汪启年.含砷废水处理研究进展[J].工业水处理,2012,32(2):10-15.
[5]高峰,贾永忠,孙进贺.除砷技术现状与展望[J].盐湖研究,2010,18(1):53-57.
[6]唐镇远.含重金属及砷废水处理研究[D].兰州:兰州大学,2010.
[2]周晓梅.我国土壤污染因素分析与防治对策探讨[D].济南:山东大学,2011.
[3]常近时.高炉磷酸新工艺大幅降低磷肥重金属含量的环保意义[J].中国石油和化工,2012,(1):41-42.
[4]高小娟,王皤,汪启年.含砷废水处理研究进展[J].工业水处理,2012,32(2):10-15.
[5]高峰,贾永忠,孙进贺.除砷技术现状与展望[J].盐湖研究,2010,18(1):53-57.
[6]唐镇远.含重金属及砷废水处理研究[D].兰州:兰州大学,2010.