Method for processing zinc concentrate with high content of indium and iron

Abstract

The invention discloses a method for processing zinc concentrate with high content of indium and iron. The method comprises steps of carrying out oxygen-enriched oxidizing smelting on the zinc concentrate so as to generate oxidized smoke and fused slag, preparing sulfuric acid through the oxidized smoke; allowing the fused slag to enter a reducing smelting furnace with a lead rain condenser for strong reduction smelting so as to generate crude zinc alloy, pig iron and slag; allowing the crude zinc alloy to enter a lead tower for distilling so as to generate a zinc-cadmium alloy and a zinc-indium base solution; allowing the zinc-cadmium alloy to enter a cadmium tower for secondary distilling so as to produce pyrogenic process distilled zinc and high cadmium-zinc alloy; casting and cooling down the pyrogenic process distilled zinc so as to obtain a zinc ingot product, distilling the high cadmium-zinc alloy in a low temperature tower so as to obtain crude cadmium and a low cadmium-zinc alloy, returning the low cadmium-zinc alloy back to the cadmium tower for distilling; distilling the zinc-indium base solution in a high temperature tower so as to generate a high indium alloy and high temperature crude zinc, returning the high temperature crude zinc back to the lead tower for distilling, and extracting indium from the high indium alloy through steps of 'crushing-leaching-extracting-replacing-electrolyzing'. The method has short technological processes and high production efficiency, has clean and environment-friendly production process, and does not discharge three wastes.

Description

technical field

[0001] The invention relates to a method for smelting nonferrous metals, in particular to a method for treating zinc concentrates containing 0.04% to 0.24% of In, 14% to 25% of Fe and 32% to 50% of Zn. Background technique

[0002] At present, there are two main methods for extracting zinc and indium from zinc concentrates containing 0.04%-0.24% In, 14%-25% zinc, and 32-50% Zn:

[0003] (1), the first treatment method is to adopt conventional leaching wet process. The process adopts the "zinc concentrate fluidized furnace roasting desulfurization - zinc calcined sand neutral and low acid two-stage countercurrent leaching - supernatant solution purification electrowinning to produce zinc - low acid leaching slag reduction and volatilization recovery of zinc indium" wet zinc smelting process . Using this process, zinc and indium are effectively recovered, the recovery rate of zinc reaches 94%, and the recovery rate of indium reaches 75%. The waste residue in ...

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