(National Key Laboratory of Biochemical Engineering，Institute of Process Engineering, CAS, Beijing 100190, China)
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DOI:
10.7502/j.issn.1674-3962.2012.02.08
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Abstract:
Recovery of nickel in electroplating waste water using slot cycle electrolysis has been investigated by experimentation, including pilot test, extended pilot test, and system expansion. The main results indicated the appropriate conditions of the industrial production: nickel ion concentration 05~25 g/L, current density 40~80 A/m 2, voltage of the slot cycle 3~6 V, pH=45~55. When the concentration of nickel ions remains at 10~25 g/L, the current efficiency is still greater than 40% if the current density adopting 100~150 A/m2 continuously; if the operation is from high concentration to low concentration and 05 g/L of each recycling, the current density should take from 40 to 80 A/m2. The concentration recovered is less than 01 g/L 10 times later. Discard it and the recovery rate of nickel would be more than 99%. By a comparison of three tests of different scales under the same conditions, it can be found that the current efficiency is almost equal. Using edge cycle of electrolysis to recover nickel in electroplating waste water is entirely feasible, and this method can ensure a high rate of recovery.