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首页> 外文期刊>Environmental Science & Technology >Removal of Cr(Ⅵ) and Cr(Ⅲ) from Aqueous Solutions and Industrial Wastewaters by Natural Clino-pyrrhotite
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Removal of Cr(Ⅵ) and Cr(Ⅲ) from Aqueous Solutions and Industrial Wastewaters by Natural Clino-pyrrhotite

机译：天然斜发铁矿-硫铁矿去除水溶液和工业废水中的Cr（Ⅵ）和Cr（Ⅲ）

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摘要

This paper introduced a simple method of treating Cr-(Ⅵ)-bearing toxic wastewaters using a natural mineral: clino-pyrrhotite. Laboratory bench-scale mixing experiments were carried out in both Cr(Ⅵ)-bearing artificial solutions and industrial wastewaters under controlled conditions. The effects of solution pH, Cr(Ⅵ) concentration, mineral grain size, mineral/solution ratio, and reaction time on the Cr-(Ⅵ) removal were studied. Chromium was effectively removed from the solutions and wastewaters. After the treatment, the liquid was clean enough to be discharged directly into the natural environment. The Cr(Ⅵ) removal process involved sequentially the adsorption of Cr(Ⅵ), in the form of Cr_2O_7~(2-) or CrO_4~(2-), onto the mineral surface, the reduction of the adsorbed Cr(Ⅵ) to Cr(Ⅲ), catalyzed at the vacant Fe sites of the mineral, and finally the precipitation of Cr(Ⅲ) as Cr_2S_3, Cr_2O_3, and Cr(OH)_3 solid phases. Conditions such as a fine mineral grain size, an excessive quantity of clino-pyrrhotite and a weak acidic media, favored the removal process. For clino-pyrrhotite with a restricted grain size, the minimum required quantity of the mineral was proportional to the total quantity of Cr(Ⅵ) to be removed. Quantitatively, one cubic meter of industrial wastewater that contained ～1 mmol dm~(-3) of Cr(Ⅵ) and had a pH value between 1 and 10 would be effectively treated after it was in contact with 220 kg of 145 ± 28 μm clino-pyrrhotite for an hour. Furthermore, the quantity of the final solid waste byproduct was small, and the solid residue of clino-pyrrhotite could be reused after a simple rinse with water. Compared to the previous Cr(Ⅵ)-bearing wastewater treatment schemes, this method was simple, effective, economical, and environmentally sound. It has great potential for use in industrial-scale applications.
机译：本文介绍了一种使用天然矿物：斜发质软铁矿处理含铬（Ⅵ）的有毒废水的简单方法。在受控条件下，在含Cr（Ⅵ）的人工溶液和工业废水中进行了实验室规模的混合实验。研究了溶液pH，Cr（Ⅵ）浓度，矿物粒度，矿物/溶液比和反应时间对Cr-（Ⅵ）去除的影响。有效地从溶液和废水中去除了铬。处理后，液体足够干净，可以直接排放到自然环境中。 Cr（Ⅵ）的去除过程包括依次以Cr_2O_7〜（2-）或CrO_4〜（2-）的形式将Cr（Ⅵ）吸附到矿物表面上，然后将吸附的Cr（Ⅵ）还原为Cr（Ⅲ）被催化在矿物的空位处，最后以Cr_2S_3，Cr_2O_3和Cr（OH）_3固相的形式析出。诸如细矿粒大小，过量的斜辉石硫铁矿和弱酸性介质等条件有利于去除过程。对于粒度受限的斜方晶硅灰石，所需的最小矿物质量与要去除的Cr（Ⅵ）总量成正比。定量地，与220 kg 145±28μm接触的一立方米工业废水中含有〜1 mmol dm〜（-3）的Cr（Ⅵ），pH值为1至10。斜发脓泡石一个小时。此外，最终的固体废物副产物的量很小，并且在用水简单漂洗后，斜辉石的固体残留物可以重复使用。与以前的含Cr（Ⅵ）废水处理方案相比，该方法简单，有效，经济且对环境无害。它在工业规模的应用中具有巨大的潜力。

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