Fully automatic current control system for metal depletion...

Details Fully automatic current control system for metal depletion... Fully automatic current control system for metal depletion...

C - Chemistry, Metallurgy

25

C

C25C 7/06 (2006.01) C25D 21/12 (2006.01)

Patent

CA 2076759

2076759 9114023 PCTABS00007 In a process for electrolytic demetallization of a solution containing metallic ions, the solution is introduced into a closed, gas-vented cell with an anode and a cathode and a d.c. current supply. The cell has a hydrogen sensor above the solution level which monitors the evolution of hydrogen during demetallization. Immediately the hydrogen above the solution exceeds a given percentage by weight, the intensity of the cell current is reduced to a predetermined level by the hydrogen sensor and switching off of the control system. If hydrogen is subsequently evolved, the current intensity is again reduced to a predetermined value. This hydrogen-evolution cycle with current reduction in each case is repeated until the residual concentration of the metallic ions falls below a given value.

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