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首页> 外文期刊>Journal of Hazardous Materials >Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite
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Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite

机译：用脱落的ver石稳定铬铁粉中的六价铬

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This study proved that vermiculite, a natural occurring mineral, can effectively remove and stabilize Cr(Vl) from fine ferrochrome dust leachate. Batch adsorption studies were carried out to determine the effect of pH, contact time and adsorbent dose on the removal of Cr(VI). The process was found to be highly pH dependent. The optimum conditions for the Cr(VI) removal are at a pH of 1.5, contact time of 2h and adsorbent dose of 10gL~(-1)The stability of the Cr(VI)-loaded vermiculite remained unchanged after 12 months, when the vermiculite was evaluated with the ASTM and TCLP Cr(VI) leach methods. However, Cr(VI) desorption did take place when the Acid Rain Test was used. The adsorption kinetic data fits the pseudo-second order model, while the equilibrium data of Cr(VI) adsorption onto vermiculite are best described by the Langmuir isotherm. The presence of hydrobiotite and biotite in the industrial vermiculite slightly decreased the degree of adsorption of Cr(VI).
机译：这项研究证明ver石是一种天然存在的矿物，可以有效地去除和稳定细铬铁粉渗滤液中的Cr（Vl）。进行了批量吸附研究，以确定pH，接触时间和吸附剂剂量对Cr（VI）去除的影响。发现该过程高度依赖pH。去除Cr（VI）的最佳条件是在pH为1.5，接触时间为2h和吸附剂量为10gL〜（-1）的条件下，负载Cr（VI）的ver石的稳定性在12个月后保持不变。用ASTM和TCLP Cr（VI）浸出方法评估石。但是，使用酸雨试验时，确实发生了Cr（VI）解吸。吸附动力学数据拟合拟二阶模型，而Langmuir等温线最好地描述了Cr（VI）吸附在ver石上的平衡数据。工业ver石中水生黑云母和黑云母的存在会稍微降低Cr（VI）的吸附程度。

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