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- Title
Electrokinetic Studies of Mine Tailings Considering Dewatering and Mass Transport at the Miduk Copper Mine, SE Iran.
- Authors
Shafaei, Foojan; Doulati Ardejani, Faramarz; Bahroudi, Abbas; Yavarzade, Mohamad; Amini, Aliasghar
- Abstract
The effect of the electrokinetic process on the extraction of trapped water was evaluated in the Miduk copper mine's tailings slurry. The effect of the dewatering process on copper removal was also studied. The initial electroosmotic permeability was determined using a one-dimensional cell. In the next step, the effect of voltage and polarity reversal was evaluated for three scenarios: T1 (2 V/cm), T2 (2 V/cm), and T3 (1 V/cm). In addition, the polarity reversal method was applied to T2 and T3. To compare the amount of water extraction and energy consumption, three indices were considered and calculated: index of dry tone, water extraction, and normal water extraction. Moreover, the effect of electrokinetics on the final moisture content, physicochemical variation, and chemical composition were investigated. The results indicated that the calculated electroosmotic permeability ranged from 1.23 × 10–9 to 1.36 × 10–9 m2/V·S, which is acceptable for electrokinetic experiments. The water extraction experiments showed average flow rates of 1.68, 1.84, and 1.73 mL/h in T1, T2, and T3, respectively. The maximum amount of water extracted in T2 was ≈ 6% more than in T3. However, considering electric energy consumption, the highest efficiency of water extraction was achieved by applying a voltage gradient of 1 V/cm for 24 h. Consequently, polarity reversal affected the water extraction efficiency by reducing energy consumption. Furthermore, moisture reduction due to the dewatering process decreased the pH variation and copper release and transport. Roughly 35% of the extractable copper was removed on the anode side of T2, which was determined to be the most efficient for remediation.
- Subjects
IRAN; COPPER mining; MINES &; mineral resources; WATER efficiency; ENERGY consumption; ELECTROKINETICS; TANKERS
- Publication
Mine Water & the Environment, 2021, Vol 40, Issue 4, p847
- ISSN
1025-9112
- Publication type
Article
- DOI
10.1007/s10230-021-00806-x