Method for reclaiming gold and silver in tailings after roasting-cyaniding of gold concentrate
A recovery method and technology for gold concentrate, applied in the field of hydrometallurgy, can solve the problem of insufficient recovery of tailings, and achieve the effects of easy popularization and application, significant benefits, and huge economic and social benefits
Active Publication Date: 2011-01-12
HENAN ZHONGYUAN GOLD SMELTERY
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The invention belongs to the technical field of hydrometallurgy, in particular to a method for reclaiming gold and silver in tailings after roasting-cyaniding of gold concentrate. The method comprises the following steps: drying the tailings until the water content of the tailings is not higher than 10 percent by weight; adding desulfurizing agent and reducing agent to reduce for 10 to 30 hours at the temperature between 900 and 1,200 DEG C; discharging after the tailings are isolated from air and cooled; crushing the tailings subject to impurity removal by separation; carrying out acid-leaching the crushed metal iron powder to obtain ferrous solution; and extracting the gold and silver noble metals in the acid-leaching residue. The method has simple process and low requirement on raw materials, reclaims the valuable elements in the tailings with low production cost, not only reclaims the metal iron, but also effectively reclaims the gold, silver and other noble metals, reduces tailing pollution, and avoids resource waste.
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