Based on the damage of heavy metals contained in tailings and research status of electrokinetic remediation, a desorption-electrokinetic-precipitation remediation method was designed on a tailing containing zinc metal. Results of desorption with different reagents showed that a better index of 63.33% was provided by citric acid, which has a double characteristic of acidic and complexation and could be chosen as desorbing reagent for the tailings. Results of electrokinetic remediation showed that a better removal rate was provided by a higher voltage gradient, which can contribute to the increase of current and movement speed of the ions in solution. However, a greater energy consumption appeared with an excessive voltage gradient. Therefore, voltage gradient of 1.5 V/cm was chosen for electrokinrtic remediation and zinc removal rate reached to 67.32% with desorption of citric acid. Zinc contained in the tailings can be removed effectively using the pre-desorption method. Results of speciation analysis showed that removal rate of weak acid form and Fe-Mn oxides form in zinc were 93.18% and 63.16%, respectively. Meanwhile, microstructure change of tailings particles after remediation was analyzed by means of SEM. Results showed that crystal and surface of tailings particles were damaged after remediation, which is helpful to accelerating movement of ions in solution and increasing remediation index. The cathode liquid containing zinc precipitated with 0.006mol/L sodium sulfide would be used as the anode electrolyte.
MENG Qi ZHANG Ying-jie DONG Peng
. Combination Method of Desorption–Electrokinetic–Precipitation for Remediation of Zinc in Tailings[J]. The Chinese Journal of Process Engineering, 2017
, 17(2)
: 339
-344
.
DOI: 10.12034/j.issn.1009-606X.216306
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