Cr(VI) recovery from chromite ore processing residual using an enhanced electrokinetic process by bipolar membranes
Cr(VI) recovery from chromite ore processing residual using an enhanced electrokinetic process by bipolar membranes
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使用双极膜增强电动工艺从铬铁矿加工残渣中回收 Cr(VI)
DOI：
10.1016/j.memsci.2018.07.079
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发表时间：
2018-11-15
影响因子：
9.5
通讯作者：
Jin, Yanchao
中科院分区：
文献类型：
--
作者：
Liu, Yaoxing;Zhu, Hanquan;Jin, Yanchao
采用双极膜(BPM-EK)改进的电动体系(BPM-EK)回收铬铁矿加工残渣(CoPR)中的六价铬(Cr(VI))。结果表明，阳极室(AC)和阴极室(CC)的电解液浓度对电池电压有影响，阳极室(AC)和阴极室(CC)的最佳电解液浓度分别为0.6m o l/L HNO_3和1.0m o l/L NaNO_3。电流密度还影响电池电压、COPR室的pH值(COPRC)、铬(VI)的回收效率、电流效率(CE)和比能耗(SEC)。最佳电流密度为3.0 mA/cm(2)。与传统的EK工艺相比，当BPM-EK系统中配备2个和3个COPRC时，可以获得更高的CE和更低的SEC，并且所有COPRC的铬(VI)回收率都高于82%。随着配置COPRC的数量从1个增加到2个和3个，CE分别从0.60%增加到1.67%和2.30%，Sec从0.906分别下降到0.433和0.395 kW h/g。实验结果表明，BPM-EK工艺是从铜矿中回收六价铬的有效方法。
An electrokinetic (EK) system improved by a bipolar membrane (BPM) (BPM-EK) was used to recycle hexavalent chromium (Cr(VI)) from the chromite ore processing residual (COPR) in the form of H2CrO4. The results showed that electrolyte concentrations in anode chamber (AC) and cathode chamber (CC) influenced the cell voltage and that 0.6 mol/L HNO3 in the AC and 1.0 mol/L NaNO3 in the CC were the optimal electrolyte concentrations. The current density also affected cell voltage, pH value of the COPR chamber (COPRC), Cr(VI) recovery efficiency, current efficiency (CE), and specific energy consumption (SEC). The optimal current density was 3.0 mA/cm(2). Compared to traditional EK processes, a higher CE and a lower SEC were obtained when two and three COPRC were equipped in the BPM-EK system and the Cr(VI) recovery efficiencies of all COPRCs were higher than 82%. With the increase in the number of equipped COPRC from one to two and three, CE increased from 0.60% to 1.67% and 2.30% and SEC decreased from 0.906 to 0.433 and 0.395 kW h/g, respectively. Experimental results showed that the BPM-EK process is an effective method for the recovery of Cr(VI) from COPR.