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Behavior,distribution and environmental influence of arsenic in a typical lead smelter 总被引:1,自引:0,他引:1
A field study was conducted to determine the behavior and distribution of arsenic during the pyrometallurgy process in a typical SKS(Shuikoushan) lead smelter in Hunan province, China. Environmental influences of arsenic in selected samples were evaluated. Arsenic contents in all input and output samples vary from 0.11% in raw lead to 6.66% in collected dust-2. More arsenic is volatilized in blast furnace and fuming furnace(73.02% of arsenic input) than bottom blowing furnace(10.29% of arsenic input).There are 78.97%, 13.69%, 7.31% of total arsenic distributed in intermediate materials, stockpiled materials and unorganized emissions, respectively. Matte slag-2, collected dust-1 and secondary zinc oxide are hazardous based on the arsenic concentrations of toxicity characteristic leaching procedure. According to risk assessment code(RAC) guideline, arsenic in collected dust-1 poses a very serious risk to the surrounding environment, arsenic in speiss, matte slag-2, water-quenched slag and secondary zinc oxide show low risk, while arsenic in matte slag-1, collected dust-2 and post dust has no risk to the environment. 相似文献
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研究了CaO对xCaO-(100-x)(30Na2O-2.8B2O3-25.2Fe2O3-42P2O5)(x=0、5%、10%、20%,指摩尔分数)玻璃结构及固砷效果的影响,研究表明加入20%(摩尔分数)CaO砷浸出浓度由3.14 mg/L降低至0.99 mg/L,固化率从60.78%增加到88.87%;CaO的加入,会破坏钠铁硼磷玻璃固砷体系中Q2桥氧结构,玻璃网络化程度降低,结构加强;同时,加入体系中的CaO 能够进入玻璃固砷体的网络结构中,使桥氧解聚,并对非桥氧结构产生集聚作用的同时,形成Ca-O-As、Ca-O-P等化学键,使玻璃体系的结构增强,致密度增加;随着CaO摩尔分数增加,Tg、△T呈现增大的趋势,玻璃结构得到增强,同时 Ca2+对非桥氧磷酸盐之间的交联,对固砷效果也有较大的影响. 相似文献
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开发从含铜砷的铜电解黑泥中分离和回收铜的湿法冶金新工艺.该工艺包括黑泥氧化酸浸和浸出液中选择性硫化沉铜两个步骤.研究各种工艺参数对铜和砷的浸出和沉淀的影响.在第一阶段中,最佳工艺条件为:初始H2SO4浓度为1.0 mol/L,液固比为10 mL/g,80℃下连续浸出4 h.此条件下铜浸出率可达95.2%,砷浸出率为97... 相似文献
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