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Compared with chlorine and bromine , there is not much research on iodine leaching gold, because people are sensible to note that the price of iodine is high, and the potential market for iodine reagents is mainly gold regeneration of gold-containing industrial waste such as waste electronic components. Usually the immersion I 2 -KI or I 2 -IO 3 - -I - composed recognized gold leaching agent is I 3, gold to AuI 2 - into the form of a solution, the precipitation of gold available hydroxylamine, sulfite - or AuI 4 The reducing agent and iodine are regenerated with an oxidizing agent such as C1 2 or Na 2 O 2 . According to 3 вÑшнцев , gold was leached with an aqueous solution containing 20 g of iodine and 40 g of potassium iodide per liter, and then gold was separated from the gold-containing iodide solution in the form of amalgam . U.S. Patent uses an iodine-potassium iodide-diacetone alcohol system to recover gold from gold-containing materials. Since the method emits a highly toxic, tear-tolerant iodonone gas during the process, the application is limited.
The Beijing precious metal smelting plant used the iodine-sodium iodate-sodium iodide-water system to dissolve the gold plating on the waste electronic components. This practical study is more practical than the industry's difficulty in using iodine reagents for the treatment of ores or concentrates.
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Overview of gold extraction by iodization
Recent studies Davis electrochemical H 2 O 2 showed unsuitable site (the InSitu) generating I 2, iodine dissolve gold speed 10 times faster than cyanide, gold dissolution process and in particular immersion in the oxidant I - pH and concentration ratio Related to the non-encapsulated gold ore containing sulfide minerals, the United States has studied the use of electrochemical oxidation to extract gold from it, the main device is a diaphragm electrolyzer, the role of sulfides such as FeS 2 is to adjust the I in the leaching system. 2 /I - ratio to produce a higher concentration of the leaching gold agent I 3 - .