Treatment method of high-indium high-iron zinc concentrate

Abstract

The invention relates to a treatment method of high-indium high-iron zinc concentrate, which comprises the following steps: carrying out two-section acidic reflux oxygen pressure leaching, including low-oxygen-pressure leaching and high-oxygen-pressure leaching, on zinc concentrate which contains 0.07-0.25% of indium In, 14-25% of iron and 40-50% of zinc; directly extracting indium from the low-oxygen-pressure leaching solution; precipitating iron from the solution after indium extraction by an oxygen pressure hematite process, thereby producing hematite slag containing 55-65% of iron; neutralizing the solution after iron precipitation with zinc oxide; carrying out zinc dust purification electrolysis on the neutralized solution to produce electric zinc; returning the neutralized slag to the low-oxygen-pressure leaching; and separating sulfur concentrate and flotation tailings from the high-oxygen-pressure leaching slag by a flotation process, recovering sulfur from the sulfur, and sending the flotation tailings into a fuming furnace to carry out reduction volatilization treatment. The invention can effectively separate iron, zinc and indium in the zinc concentrate, enhance the smelting recovery rate of zinc and indium, recycle iron in the zinc concentrate as a resource, and fundamentally avoid producing low-concentration sulfur dioxide, thereby effectively protecting the environment.

Description

technical field [0001] The invention relates to a method for smelting non-ferrous metals, in particular to a treatment method for zinc concentrate containing 0.07%-0.25% of indium In, 14%-25% of iron and 40-50% of zinc. Background technique [0002] At present, the treatment method for extracting zinc indium from zinc concentrates containing 0.07% to 0.25% of indium In, 14% to 25% of iron, and 40 to 50% of zinc is: zinc concentrate boiling desulfurization-zinc calcination Hot acid leaching--aluminum method to deposit iron indium-indium and supernatant solution to purify electrowinning to produce zinc-alumina slag reduction and volatilization to recover zinc indium. This method is referred to as the "hot acid leaching-jadosite method for iron precipitation" process. In this method, zinc obtains a relatively high leaching rate, and iron and indium are precipitated and enriched into the jarosite slag together; Reduction and volatilization treatment is carried out in the rotary...

AI Technical Summary

Problems solved by technology

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 indium content in the rotary kiln slag is 0.03%, which makes it impossible to recover the indium which accounts for about 10% of the total indium metal in the raw material zinc concentrate; 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

Chinese patent CN200510031335.0 proposes to use a conventional neutral leaching method to dissolve most of the zinc that is easy to recover and exist in the form of zinc oxide into the solution, separate it from the difficult-to-handle zinc ferrite, and then subject the neutral leaching residue to high temperature Reduction and volatilization treatment, then separate zinc, indium and iron, and finally recover zinc and indium from the volatilized dust. In this process, 92% of zinc and 70% of indium are effectively recovered, but the high-temperature reduction and volatilization treatment is neutral The leaching slag has a large amount of slag, and the slag contains more than 25% zinc. The production cost of high-temperature reduction and volatilization is very high, and the recovery rate of indium smelting is low, so in the end, the treatment of indium containing In0.07% ~ 0.25%, containing Industrial Application of Iron 14%~25% Zinc Concentrate

This process has not applied for an invention patent. The main purpose of the semi-industrial test is to verify the applicability of the domestic titanium high-pressure reactor in addition to the technical feasibility of the process.

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