Study of enriching indium from low-acid indium-bearing lixivium.

To enrich indium effectively in a low-acid leach liquor containing 113.7 g/l Zn, 8.15 g/l Fe3+ and 0.2346 g/l In and to improve the In recovery rate, a process was proposed for the enrichment of indium by reducing (Fe)3+ with Zn concentrates, followed by precipitation of In from the neutralised reduction solution with nano-zinc oxide. The optimum conditions of the reduction process were as follows: particle size of ZnS concentrates 0.074 mm, excess coefficient of ZnS concentrates 2.0, reduction temperature 95 degrees C and reduction time 3.0 h. The concentration of Fe3+ solution was 0.18 g/l after reduction and the reduction rate of Fe3+ was 97.84%. The optimum conditions for indium precipitation by neutralisation were as follows: neutralising time 75 min, temperature 70 degrees C and excess coefficient of neutralising agent 1.20. Under such conditions, the grade of indium in the neutralisation slags reached more than 2% with the precipitation rate reaching 97.57% of In.
To enrich indium effectively in a low-acid leach liquor containing 113.7 g/l Zn, 8.15 g/l Fe3+ and 0.2346 g/l In and to improve the In recovery rate, a process was proposed for the enrichment of indium by reducing (Fe)3+ with Zn concentrates, followed by precipitation of In from the neutralised reduction solution with nano-zinc oxide. The optimum conditions of the reduction process were as follows: particle size of ZnS concentrates 0.074 mm, excess coefficient of ZnS concentrates 2.0, reduction temperature 95 degrees C and reduction time 3.0 h. The concentration of Fe3+ solution was 0.18 g/l after reduction and the reduction rate of Fe3+ was 97.84%. The optimum conditions for indium precipitation by neutralisation were as follows: neutralising time 75 min, temperature 70 degrees C and excess coefficient of neutralising agent 1.20. Under such conditions, the grade of indium in the neutralisation slags reached more than 2% with the precipitation rate reaching 97.57% of In.