Treatment method of high-indium and high-copper zinc ore concentrate

Abstract

The invention discloses a treatment method of a high-indium and high-copper zinc ore concentrate, which comprises the following steps: performing oxygen enrichment oxidizing smelting on the zinc ore concentrate containing 0.03-0.10% of In, 2-5% of Cu and 40-50% of Zn, performing strong reduction smelting on fusion slag to produce spelter alloy, crude copper and slag, and selling the crude copper and slag externally; distilling the spelter alloy to produce zinc cadmium alloy and a zinc indium base solution; performing secondary distillation on the zinc cadmium alloy to produce distilled zinc and high cadmium zinc alloy; casting and cooling the distilled zinc to obtain a zinc ingot product, distilling the high cadmium zinc alloy in a low-temperature tower to obtain crude cadmium and low cadmium zinc alloy, and distilling the low cadmium zinc alloy in a cadmium tower; distilling the zinc indium base solution in a high-temperature tower to produce high indium alloy and high-temperature crude zinc, distilling the high-temperature crude zinc in a lead tower, and extracting indium from high indium alloy. The adopted treatment method has the following advantages: the technological process is short, the invested occupied area is small, the production efficiency is high, the production cost is low, the production process is clean and environmentally friendly, and the three wastes (waste gas, waste water and industrial residue) are not emitted.

Description

technical field [0001] The invention relates to a method for smelting nonferrous metals, in particular to a method for processing high-indium, high-copper-zinc concentrate. Background technique [0002] At present, there are two main methods for extracting zinc, indium and copper from zinc concentrates containing In0.03-0.10%, Cu2-5%, and Zn40-50%: [0003] The first treatment method is to use the conventional leaching wet process. The process adopts "Zinc Concentrate Fluidized Furnace Roasting and Desulfurization - Zinc Calcined Sand Neutral and Low-acid Two-stage Countercurrent Leaching - Medium and Supernatant Solution Replacement Decopper - Cleaning Liquid Electrowinning to Produce Electric Zinc - Low-acid Leach Slag Reduction Volatilization and Recovery of Zinc Indium "Hydrometallurgy zinc process. Using this process, zinc, indium and copper are effectively recovered, the recovery rate of zinc reaches 94%, the recovery rate of indium reaches 75%, the recovery rate of ...

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%, which affects the benefit; (4) The recovery rate of copper is low, only 85%, and the obtained copper slag contains about 50% copper, which requires further melting to obtain blister copper

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 0.02%, which makes the indium which accounts for about 10% of the total amount of indium metal in 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 reduced volatile flue gas needs to be absorbed and treated before it can be discharged up to the standard; (4) The recovery rate of copper is low, only 85%, and the grade of copper removal slag is low, and further melting is required to produce semi-finished products blister copper

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