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The sub-gold solution can be purified by sodium sulfite reduction, can choose a direct reduction or two step-by-step reduction:.
1, a direct reduction: in the sub-gold solution by adding an excess of sodium sulfite solution, so that the gold is completely reduced out, the purity of this part of the gold can reach more than 99%, filtered can be used as raw materials for gold electrolysis, to produce 99.99% gold powder.
2, two step-by-step reduction: a reduction: the chlorogold acid solution pumped into the reduction reaction kettle, control the amount of reducing agent added, solution redox potential, pH and temperature, so that its impurity metals are not reduced and remain in the poor solution. Primary reduction of gold powder can reach more than 99.99% purity after washing and drying; Secondary reduction: add excess sodium sulfite solution to the primary reduction solution, so that the gold is completely reduced out, the purity of this part of the gold can reach more than 99%, filtering can be used as raw materials for gold electrolysis to produce 99.99% gold powder.
