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首页> 外文期刊>High temperature materials and processes >Dissolution Characteristics and Morphology of Large-sized Scorodite Particles Synthesized from Fe(Ⅱ) and As(Ⅴ) in Aqueous Solution
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Dissolution Characteristics and Morphology of Large-sized Scorodite Particles Synthesized from Fe(Ⅱ) and As(Ⅴ) in Aqueous Solution

机译：Fe（Ⅱ）和As（Ⅴ）合成的大型方钴矿颗粒在水中的溶解特性和形貌

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摘要

A novel process for preparing scorodite particles with a diameter of approximately 20 μm from Fe(Ⅱ) and As(Ⅴ) in aqueous solution has been developed by DOWA Metals and Mining. In the present study, the dissolution characteristics of iron and arsenic from the scorodite particles synthesized by this process have been investigated under different conditions. The results show that the concentration of arsenic dissolved from the particles in aqueous solution is very low, but it has a complicated dependence on the temperature and pH of the solution. Transmission electron microscopy (TEM) with an energy dispersive X-ray spectrometer (EDS) was used to analyze the morphology, structure, and composition of the scorodite particles. The results indicate that the scorodite particles exhibit a nearly octahedral shape with planes composed of almost (111) planes in the orthorhombic structure. The concentration of iron at the surface of the particles is higher than that of iron inside of the particles. This characteristic morphology, along with the minimal surface defects of the scorodite particles, is considered to be responsible for the low dissolution of arsenic from the particles in aqueous solution. Atmospheric temperature and solution conditions were also found to be important for the safe, long-term storage of arsenic using scorodite particles.
机译：DOWA Metals and Mining开发了一种新方法，该方法可从水溶液中的Fe（Ⅱ）和As（Ⅴ）制备直径约20μm的臭葱石颗粒。在本研究中，已经研究了在不同条件下通过该方法合成的臭葱石颗粒中铁和砷的溶解特性。结果表明，水溶液中从颗粒中溶解的砷浓度非常低，但是对溶液的温度和pH值具有复杂的依赖性。使用具有能量色散X射线光谱仪（EDS）的透射电子显微镜（TEM）分析臭葱石颗粒的形态，结构和组成。结果表明臭葱石颗粒呈现出近似八面体的形状，其平面由正交晶结构中的几乎（111）个平面组成。颗粒表面的铁浓度高于颗粒内部的铁浓度。该特征形态以及臭葱石颗粒的最小表面缺陷被认为是导致砷从颗粒在水溶液中的低溶解的原因。人们还发现，大气温度和溶解条件对于使用臭葱石颗粒安全，长期存储砷很重要。

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  • 来源
    《High temperature materials and processes》 |2012年第5期|p.451-458|共8页
  • 作者

    S. Fujieda; K. Shinoda; T. Inanaga; M. Abumiya; S. Suzuki;

  • 作者单位

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1,Sendai 980-8577, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan;

    DOWA Metals and Mining Co., LTD., Japan;

    DOWA Metals and Mining Co., LTD., Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    scorodite; arsenic; dissolution; solubility;

    机译：臭葱石砷;解散溶解度;

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