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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97.6%。同时,通过Avrami模型成功模拟氧化酸浸过程铜和砷的浸出动力学,发现铜和砷浸出反应的表观活化能分别为33.6和35.1 kJ/mol,表明该浸出过程主要受化学反应和扩散混合控制。在选择性硫化沉淀过程中,最佳工艺条件为:硫与铜摩尔比2.4:1、时间1.5 h、温度25℃。此条件下99.4%的铜以Cu S形式回收,而砷的沉淀率仅0.1%。 相似文献
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