Ferric iron reducing method in wet process for extracting indium from indium-containing zinc hypoxide or zinc concentrate

Abstract

The invention discloses a ferric iron reducing method in wet process for extracting indium from indium-containing zinc hypoxide or zinc concentrate. The method comprises the following steps: putting zinc concentrate into a drying stove to be dried until the water content of the zinc concentrate is less than 4%, and forging and grinding the zinc concentrate into powder with the fineness of 300 meshes above; adding the finely ground zinc concentrate with the amount 1.5-2 times of the theoretical amount of Fe<3+> into an indium infusion solution, controlling the temperature to 90-95 DEG C, and filter-pressing after reacting for 3-4 hours; feeding a filter-pressed solution into an indium recovering system, and feeding filter-pressed slag into a fluidized bed boiler to be roasted. According to the invention, the zinc concentrate is forged and ground into powder with the fineness of 300 meshes above, so that the full contact between a ZnS surface and a solution is facilitated, further the reduction rate is increased, and the reaction time is shortened; the zinc concentrate is directly used for substituting for iron powder, so that the increment of impurities carried by other auxiliary materials is reduced, and the production cost can be reduced; harmful gas like sulfur dioxide is not produced during the reaction, so that the operating environment is optimized; the produced reducing slag can be directly conveyed back to the fluidized bed boiler to be roasted, so that no waste slag is generated.

Description

technical field [0001] The invention belongs to a method for extracting indium from indium-containing subzinc oxide or zinc concentrate in a wet method, and specifically relates to a method for reducing ferric iron in indium from indium-containing subzinc oxide or zinc concentrate. Background technique [0002] In the hydrometallurgy of indium-containing subzinc oxide or zinc concentrate to extract indium, the ferric ion reduction process currently adopts iron powder reduction method, sodium sulfite reduction method, zinc sulfite reduction method, etc. Among them, the iron powder reduction method consumes iron powder: first, the concentration of iron in the solution will be increased during the reaction, and the production cost will be increased for the iron removal in the subsequent process; The recovery rate of zinc and indium is lowered, and the third is to produce harmful gas, which has a little adverse effect on the environment; zinc sulfite and sodium sulfite reductio...

AI Technical Summary

Problems solved by technology

Among them, the iron powder reduction method consumes iron powder: first, the concentration of iron in the solution will be increased during the reaction, and the production cost will be increased for the iron removal in the subsequent process; The recovery rate of zinc and indium is lowered, and the third is to produce harmful gas, which has a little adverse effect on the environment; zinc sulfite and sodium sulfite reduction method: one is that the raw materials are expensive and the cost is high, and the other is that a large amount of sulfur dioxide is produced in the reaction, which seriously pollutes the environment , affecting the health of employees

[0003] It has been reported that zinc concentrate and lead concentrate are used to reduce the ferric ion technology in the solution, but because the reaction time of zinc concentrate is too long, it takes more than 7 hours, the reduction efficiency is not high, and the technical conditions for indium extraction cannot be reached. Concentrate is rarely used in actual production because of its high cost

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