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首页> 外文期刊>Hydrometallurgy >Continuous circuit coprecipitation of arsenic(V) with ferric iron by lime neutralization: Process parameter effects on arsenic removal and precipitate quality
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Continuous circuit coprecipitation of arsenic(V) with ferric iron by lime neutralization: Process parameter effects on arsenic removal and precipitate quality

机译：石灰中和砷与铁的连续循环共沉淀：工艺参数对除砷和沉淀质量的影响

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The coprecipitation of arsenic(V) with ferric iron was studied through the use of continuous circuit coprecipitation experiments that involved lime neutralization of acidic sulfate solutions (Fe/As molar ratio of 4) to pH 8. The influence of coprecipitation circuit design on arsenic removal was evaluated through one, two and three-stage experiments as well as the use of solids recycling in a two-stage circuit. The two-stage (operating respectively at pH 4 and 8) continuous circuit configuration produced the lowest residual arsenic concentration and the lowest specific surface area coprecipitate. Two-stage continuous experiments were also used to examine the influence of nickel and aluminum, co-ions that are common in industrial solutions. Nickel was not observed to significantly influence the residual dissolved arsenic under the conditions tested. Aluminum was found to be a suitable equimolar substitute for a portion of the ferric iron. X ray diffraction and Raman spectroscopic data indicated that the coprecipitates consisted of a mixture of gypsum, poorly crystalline ferric arsenate and (arsenic-bearing) ferrihydrite. Calculations based on the pH of point of zero charge (pH_(pzc)) suggested that the content of ferric arsenate ranged from 24% to 57% and was influenced by the coprecipitation circuit design. The highest ferric arsenate content was observed with the two-stage coprecipitation circuit which also yielded the lowest residual arsenic concentration. The results indicated that subtle chemical differences induced in the coprecipitates by the process could be of significant influence to the geochemical stability of arsenic.
机译：通过使用连续回路共沉淀实验研究了砷（V）与三价铁的共沉淀，该实验涉及将酸性硫酸盐溶液（Fe / As摩尔比为4）的石灰中和至pH8。共沉淀电路设计对除砷的影响通过一阶段，两阶段和三阶段实验，以及在两阶段回路中使用固体再循环，对碳纤维进行了评估。两阶段（分别在pH 4和8下运行）连续回路配置产生最低的残留砷浓度和最低的比表面积共沉淀。还使用两阶段连续实验来检验工业解决方案中常见的镍和铝，共离子的影响。在测试条件下，未观察到镍显着影响残留的溶解砷。发现铝是一部分三价铁的合适的等摩尔替代物。 X射线衍射和拉曼光谱数据表明，共沉淀物由石膏，结晶性较弱的砷酸铁和（含砷的）亚铁水合物的混合物组成。根据零电荷点的pH（pH_（pzc））进行的计算表明，砷酸铁的含量范围为24％至57％，并且受共沉淀电路设计的影响。在两级共沉淀回路中观察到最高的砷酸铁含量，这也产生了最低的残留砷浓度。结果表明，该过程在共沉淀物中引起的细微化学差异可能对砷的地球化学稳定性有重要影响。

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