A kind of processing method of high indium and high iron zinc concentrate

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 non-ferrous metal smelting method, in particular to a treatment method of zinc concentrate containing 0.04% to 0.24% of In, 14% to 25% of Fe and 32 to 50% of Zn. Background technique [0002] At present, the zinc concentrates containing In0.04%-0.24%, Fe14%-25% zinc, and Zn32-50% are treated, and there are two main methods for extracting zinc and indium: [0003] (1) The first treatment method is to adopt the conventional leaching wet process. The process adopts the "zinc concentrate boiling furnace roasting desulfurization - zinc calcine neutral and low acid two-stage countercurrent leaching - middle and supernatant solution purification electrowinning to produce electrozinc - low acid leaching residue reduction and volatilization recovery of zinc indium" hydrometallurgical zinc smelting process . Using this process flow, zinc and indium are effectively recovered, the recovery rate of zinc reaches 94%, and the recovery rat...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: (1) the primary leaching rate of zinc is low, and the volatilization kiln has a large processing capacity; (2) due to the large volatilization kiln processing capacity, a large amount of coal char needs to be consumed; (3) the recovery rate of indium is low , only 75%, affecting the benefit

The main disadvantages of this method are: (1) The amount of alum slag is large, and a large amount of coke needs to be consumed in the reduction and volatilization treatment in the rotary kiln, which leads to high production costs; The average content of In in the rotary kiln slag is 0.03%, which makes the indium, which accounts for about 10% of the total indium metal of the raw material zinc concentrate, unable to be recovered; (3) Alumite slag contains a large amount of sulfate radicals, which are decomposed during the reduction and volatilization process of the rotary kiln A large amount of sulfur dioxide gas is produced, and the reduction of volatile flue gas needs to be absorbed and treated before it can be discharged up to the standard

However, the production and application of this process in China is still immature, and there is no application manufacturer of hematite iron precipitation technology in the world. Therefore, there is still a relatively large risk in the production and application of this process.

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