Method for separating zinc and indium and iron from indium-enriched high-iron high-zinc calcine through reduction-magnetic separation

Abstract

The invention relates to a method for separating zinc and indium and iron from indium-enriched high-iron high-zinc calcine through reduction-magnetic separation, belonging to the technical field of mineral processing. The invention is characterized in that the method adopts the technical means that mineral dressing is combined with smelting and performs smelting firstly and mineral dressing secondly; and the method is as follows: the waste heat of the indium-enriched high-iron zinc calcine obtained through fluidized roasting is utilized, the indium-enriched high-iron zinc calcine is introduced to perform low-temperature weak reduction treatment at below 570 DEG C and ensure that zinc ferrite is decomposed and reduced to ZnO, Fe3O4 and iron, the reduced calcine is levigated to prepare slurry, and zinc and indium and iron is separated through wet-type magnetic separation to obtain iron ore concentrates and indium-enriched zinc- enriched ore concentrates. The method has low energy consumption and low dosage of a reducing agent, is simple in operation, easy in control and high in metal recovery rate. Therefore, the indium embedded and distributed in zinc ferrite can be released, the loss caused by the high temperature volatilization of indium can be avoided, and the zinc and indium and iron of the indium-enriched high-iron high-zinc calcine can be separated in an ore dressing manner before leaching.

Description

technical field [0001] The invention relates to a method for reducing and magnetically separating zinc, indium and iron from indium-rich, high-iron-zinc calcine, and belongs to the technical field of mineral processing. Background technique [0002] Indium-rich high-iron-zinc calcine is a zinc metallurgical material rich in indium and a large amount of impurity iron obtained after roasting high-indium and high-iron zinc sulfide concentrate. With the development of zinc hydrometallurgy process, the utilization of complex zinc mineral resources with low zinc grade and high impurity content is becoming more and more common, especially the utilization of high iron zinc concentrate is the most obvious. [0003] High-iron zinc sulfide concentrate usually refers to the general term for a class of zinc sulfide concentrates containing more than 7.5wt% iron, less than 48wt% zinc, generally 25-35wt% sulfur, and associated with a relatively high content of indium metal. For the treatme...

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Problems solved by technology

[0006] Although the above methods have achieved good results in improving the leaching rate of zinc and indium in calcine, a large amount of iron will inevitably be leached into the solution while decomposing zinc ferrite to increase the leaching rate, which needs to be purified and removed. Iron, and because the leaching solution is rich in indium, in order to effectively recover metal indium, the purification process is relatively complicated. During the purification process, a large amount of leached zinc and indium are lost to iron slag, which reduces the metal recovery rate.

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