Antimony trichloride leaching - diaphragm electrowinning method

To simplify the process, research separator electrodeposition process of FIG. 1 in place of the iron powder and chlorine substitutions regeneration step. The principle is that in a case where the control of an appropriate potential, so that bismuth diaphragm electrolyzer reduced at the cathode:

The oxidation of iron occurs at the anode:

Figure 1 bismuth ferric chloride leaching of tin ore - iron replacement mentioning the bismuth process flow diagram

The technical key to this process is the control of the electrode potential and the control of the solution through the velocity of the membrane. In the cathode region, the main cations in the solution are Bi ^{3 +} , Fe ^{2 +} and H ⁺ . In the anode region, the main cations in the solution are Bi ^{3 +} , Fe ^{3 +} and H ⁺ , which are trivalent irons in the anode region. Without reducing the current efficiency at the cathode, the cathode and anode should be separated by a suitable separator material. The liquid level in the cathode region should be higher than the anode region, and the permeation rate of the electrolyte should be controlled so that the flow rate is equivalent to the oxidation rate of the ferrous iron.

Compared with the ferric chloride-iron powder replacement method, the process is simple. However, due to the high concentration of iron ions in the solution, the ferroelectric process will inevitably reduce through the diaphragm under the action of the electric field force, which will reduce the current efficiency (current efficiency 42% to 50%). strict.

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