Smelting method of high-indium high-iron zinc concentrate

Abstract

The invention relates to a smelting method of high-indium high-iron zinc concentrate, which comprises the following steps: carrying out boiling-bed roasting on high-indium high-iron zinc concentrate, carrying out neutral leaching on the obtained roasted product, and carrying out purifying electrolysis on the neutral leaching solution to produce electrodeposited zinc; washing the neutral leaching slag with countercurrent water, returning the washing water to the neutral leaching preparation solution, carrying out strong-reduction smelting on the washed slag to produce a crude zinc alloy, sending the crude zinc alloy into a lead tower to perform distillation, sending the obtained zinc cadmium alloy into a cadmium tower to perform secondary distillation, carrying out casting cooling on the produced distilled zinc to obtain a zinc ingot product, distilling the high-cadmium zinc alloy in a low-temperature tower, using the obtained crude cadmium for producing a cadmium ingot, and returning the low-cadmium zinc alloy to the cadmium tower for distillation; and distilling the zinc indium bottom solution in a high-temperature tower, returning the produced high-temperature crude zinc to the lead tower for distillation, and carrying out crushing, leaching, extraction, replacement and electrolysis on the high-indium alloy to extract the indium. The method has the advantages of reasonable technique, clean and environment-friendly process, less emission of three wastes, high production efficiency and low production cost.

Description

technical field [0001] The invention relates to a method for smelting nonferrous metals, in particular to a method for smelting high-indium and high-iron-zinc concentrates. Background technique [0002] At present, there are two main smelting methods for extracting zinc and indium from zinc concentrates containing 0.03-0.20% In, 12-20% Fe, and 40-50% Zn: [0003] The first smelting method is to use the conventional leaching wet process. The process adopts "Zinc Concentrate Boiling Furnace Roasting and Desulfurization-Neutral and Low-acid Zinc Calcined Secondary Countercurrent Leaching--Middle and Supernatant Solution Purification Electrowinning Production of Electrolytic Zinc-Low-acid Leach Slag Reduction Volatilization and Recovery of Zinc Indium" wet zinc smelting craft. 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 the production process has been har...

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, so there is still a relatively large risk in the production and application of this process

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