Method for reclaiming indium from waste mercury-free basic zinc-manganese battery

Abstract

The invention discloses a method for recycling indium from waste Hg-free alkaline zinc manganese dioxide battery, which comprises the following steps: separating and extracting the cathode material from waste Hg-free alkaline zinc manganese dioxide battery, dissolving with an acid, adding a reducing agent to replace sponge indium, and smelting the sponge indium to obtain indium ingots, the filtrate being used for electrolytic zinc process; or alternatively adjusting the pH value of the solution to 5 with a base solution after acid dissolution to allow the precipitation of In(OH)3, filtering to separate the filtrate used for electrolytic zinc process and the precipitate used as electrolyte after acid dissolution, and electrolyzing to obtain pure indium. Based on the existing state of indium in the waste Hg-free alkaline zinc manganese dioxide battery and the practical recovery of waste Hg-free alkaline zinc manganese dioxide battery, the invention realizes the recycle of indium and has the advantages of simple process, easy application, high and stable recovery rate of indium, less use of chemical additives in the recycle process, no secondary pollution, and high purity of extracted metal indium. Therefore, the invention realizes the cyclic regeneration of cathode material of waste alkaline zinc manganese dioxide battery and is better in economic benefit and environment-protection value.

Description

technical field [0001] The invention relates to waste battery recovery technology, in particular to a method for recovering indium from waste mercury-free alkaline zinc-manganese batteries. Background technique [0002] my country is a big producer and consumer of zinc-manganese batteries. Since January 1, 2005, the alkaline zinc-manganese batteries produced in China have been completely mercury-free, and the production and consumption of alkaline zinc-manganese batteries occupy a dominant position in primary batteries. The main measure for mercury-free alkaline zinc-manganese batteries is to use suitable mercury substitute additives. Mercury substitute additives usually include inorganic type (such as indium, gallium, thallium, aluminum and other metal elements or compounds) and organic type (such as biphenyls, alcohol amines, amides and other compounds) to achieve mercury in the battery effect. There are many combinations of mercury substitute additives used in literatu...

AI Technical Summary

Problems solved by technology

But this method is in the processing process, owing to there is more oxidizing agent (the anode material MnO that has not acted completely 2 ), indium may be transformed into In(OH) 3 , due to In(OH) 3 The complexity of dissolving in alkaline solution can easily cause the loss of indium, so this method has the disadvantages of low recovery and instability