This study investigated the electrokinetic (EK) treatment of Cr from chromite ore processing residue (COPR) using rhamnolipid as the electrolyte. Chemical fractions were analyzed to better understand the transformation and migration of Cr from COPR with different electrolytes and time. The results showed the removal efficiency of Cr(Ⅵ) was enhanced to 90.04% with a concentration of rhamnolipid at 15 g/L, and the total Cr increased to 19.65% at 20 g/L; the above values are higher than 65.74% and 9.52% when using deionized water, respectively. After the EK treatment, the concentrations of Cr in the form of exchangeable (EXC), carbonates (CAR), Fe–Mn oxides (FM) and residual (RES) decreased while the organic matter (OC) form increased. Rhamnolipid greatly promoted a transformation between the chemical fractions and the migration of Cr. The transformation was most effective on the third day, and the removal efficiency gradually increased until reaching the best result on the fifth day; however, a further extension of time was detrimental to the transformation and migration of Cr. After the controlled experiment, the environmental toxicity of the remaining Cr decreased as the Cr in the high-risk fraction was effectively removed.

这项研究研究了使用鼠李糖脂作为电解质对铬铁矿矿石加工残渣（COPR）中铬的电动（EK）处理。分析了化学馏分，以更好地了解在不同电解液和时间下，COPR中Cr的转化和迁移。结果表明，鼠李糖脂浓度为15 g / L时，Cr（Ⅵ）的去除率提高到90.04％； 20 g / L时，Cr的去除率提高到19.65％。使用去离子水时，上述值分别高于65.74％和9.52％。经过EK处理后，可交换（EXC），碳酸盐（CAR），铁锰氧化物（FM）和残留（RES）形式的Cr浓度降低，而有机物（OC）形式增加。鼠李糖脂极大地促进了化学成分与Cr迁移之间的转化。转化在第三天最有效，去除效率逐渐提高，直到第五天达到最佳效果。然而，时间的进一步延长不利于铬的转化和迁移。在对照实验之后，随着高风险部分中的Cr被有效去除，剩余Cr的环境毒性降低。