Gold extraction method employing gold cyanided tailing roasting-ultrasonic intensification thiourea gold leaching-activated carbon enrichment

Abstract

The invention relates to a gold extraction method employing gold cyanided tailing roasting, ultrasonic intensification thiourea gold leaching and activated carbon enrichment, and belongs to the field of wet method metallurgy. According to the gold extraction method, gold-containing cyanided tailing is subjected to roasting treatment, then thiourea is used for leaching gold, meanwhile the ultrasonic intensification treatment is carried out, solid-liquid separation is performed after the gold leaching, gold contained in the liquid phase is gathered by the activated carbon through enrichment, solid-liquid separation is performed after the enrichment, the activated carbon is used for extracting and resolving gold, after resolving, the activated carbon is activated to be recycled repeatedly, a large quantity of thiourea exits in the tail liquid, and the thiourea can be circularly used for the leaching process after being simply treated. The gold extraction method is used for extracting gold in the cyanided tailing through leaching, the leaching speed is high, the extraction rate can be more than 90%, the cycle is short, and the activated carbon and the tail liquid can be recycled, so the production cost is greatly reduced, the economical benefit on the utilization of gold cyanided tailing is improved, and meanwhile, the environmental protection is facilitated.

Description

technical field [0001] The invention relates to a gold extraction method of roasting gold cyanide tailings-ultrasonic enhanced thiourea gold leaching-activated carbon enrichment, and belongs to the field of hydrometallurgy. Background technique [0002] At present, the method of extracting gold is mainly by cyanide extraction. As a classic method, cyanide gold leaching is simple in operation, high in gold recovery rate and low in production cost. It has been widely used in the gold industry and occupies a dominant position. However, because cyanide is highly toxic, it is more harmful to environmental pollution, has defects such as long production cycle, and has poor leaching effect on low-grade ores such as gold tailings. [0003] With the increasing amount of gold tailings and the scarcity of gold resources, gold in tailings has become a resource that cannot be underestimated. Therefore, it is particularly important to seek a method suitable for extracting gold from gold c...

AI Technical Summary

Problems solved by technology

In the patent CN88102653.0 "New industrial production process for gold extraction by thiourea iron leaching method", the particle size of the leached material needs to be -320 mesh, and the leaching time needs to be 32 to 40 hours. The crushing time is long, the cost is high, and the leaching cycle is too long; patent CN92105962. 0 "The method of extracting gold and silver with thiourea" has the advantages of high leaching rate and short production cycle, but it needs to add SO 2 The industrial flue gas pollutes the production environment and is not conducive to manual operation. At the same time, if this method is used to extract low-grade gold in the tailings, it may not necessarily have the same gold and silver grades as the original ore in the actual operation. High leaching rate: Patent CN200310110091.6 "Biological Oxidation of Refractory Gold Concentrate - Thiourea Resin Slurry Gold Extraction Process" has the advantages of high leaching rate and low cost, but its pretreatment process is cumbersome and time-consuming; patent N200810136957.3 "A gold extraction process with thiourea carbon slurry" has the advantages of high recovery rate and environmental protection, but its disadvantages are cumbersome operation and long process cycle

Images