在第二个反应器中，用三价铁离子溶液浸出矿石。
引起极限扩散电流密度明显增加的临界磁场强度随三价铁离子浓度增加而减小。
The minimum magnetic field intensity needed to induce significant effect on cathodic limiting diffusion current density decreased with increasing ferric ion concentration.
通过维持隔膜袋里混合溶液小的静压头，避免含有三价铁离子的阳极液扩散进入阴极室。
Diffusion of anolyte containing ferric ion into the cathode compartment is avoided by maintaining a small hydrostatic head of the mixed solution in the diaphragm-bag.
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