Selective leaching of chromium-containing slag by HCl
Selective leaching of chromium-containing slag by HCl
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DOI：
10.1007/s11771-008-0152-2
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发表时间：
2008-12-01
影响因子：
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通讯作者：
Shu Yu-de
中科院分区：
文献类型：
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作者：
Yang Zhi-hui;Chai Li-yuan;Shu Yu-de
通过一系列柱浸试验，研究了含铬渣在盐酸溶液中浸出过程中Cr（VI）浓度的变化，以及pH值、固液比、流速和温度对Cr（VI）浸出的影响。在此基础上，建立了Cr（VI）浸出过程的拟合模型，得到了Cr（VI）浸出的最佳工艺参数。结果表明，随着pH值的降低、流速和温度的升高，渗滤液中Cr（VI）浓度逐渐升高。此外，Cr（VI）的浸出率随着固体质量与溶液体积比的增加而增加。Cr（VI）选择性浸出的最佳工艺参数为：pH=3.0，固液比1.5，流速180 mL/min，温度40 ℃。Cr（VI）的浸出过程符合nu=1.87t（-0.54）的数学模型，表明Cr（VI）的浸出率呈指数级下降，为-0.54。
A batch of column experiments was carried out to investigate the change of Cr(VI) concentration leached out from chromium-containing slag with HCl as leaching agent, and to study influences of pH, ratio of solid mass to solution volume, flow velocity and temperature on Cr(VI) leaching. The optimal parameters were obtained for Cr(VI) leaching and a fitting model was established to describe the procedure of Cr(VI) leaching. The results show that Cr(VI) concentration in leachate increases with decreasing pH and increasing flow velocity and temperature. Moreover, Cr(VI) leaching percentage increases with increasing ratio of solid mass to solution volume. The optimal parameters for Cr(VI) selective leaching are as follows: pH=3.0, 1.5 of ratio of solid mass to solution volume, 180 mL/min of flow velocity and 40 degrees C of temperature. The procedure of Cr(VI) leaching fits well with the model: nu=1.87t(-0.54), indicating that the leaching rate of Cr(VI) declines in an exponential order of -0.54.