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Comprehensive recycling process for valuable metal roasting-cyaniding gold-containing tailing

A technology for valuable metals and tailings, which is applied in the field of roasting - comprehensive recovery of cyanidation gold-containing tailings, can solve the problems of secondary environmental pollution, low recovery rate, poor impurity removal effect, etc., and achieves short technological process. , High promotion value, easy promotion effect

Inactive Publication Date: 2011-08-31
田文学 +2
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Problems solved by technology

[0003] Because gold and silver are present in such tailings in very complicated forms, mainly wrapped by metal oxides and gangue, it is very difficult to further extract valuable metals by traditional techniques
Although relevant researchers have proposed many treatment methods, the most commonly used method is tailings regrinding-heap leaching, its recovery rate is low, and because cyanide is used again during the process, it is easy to cause secondary pollution to the environment
There are also relevant researchers who have studied the utilization of iron in tailings, that is, extracting iron from it to produce iron-based products, but most of the impurities are not up to the standard, the effect of removing impurities is not good, and the relevant national standards cannot be met, and it has not been widely accepted. to promote

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  • Comprehensive recycling process for valuable metal roasting-cyaniding gold-containing tailing
  • Comprehensive recycling process for valuable metal roasting-cyaniding gold-containing tailing

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Embodiment Construction

[0033] In order to better illustrate the present invention, give examples as follows:

[0034] Get 500 grams of tailings after roasting-cyanidation and put them into a three-neck bottle (the main components of tailings are shown in Table 1), add 20% hydrochloric acid solution by mass percentage with a solid-to-liquid ratio of 1:3, heat to 120 ° C, and continuously Stirring and leaching for 8 hours, at this time, the leaching rate of sampling detection Fe was more than 95%; stop heating, then add 20g of sodium hypochlorite, and simultaneously feed chlorine gas continuously, and stir for 2 hours; the reaction was finished and washed and filtered, and now the filter residue sample was taken to detect the Au content. Below 0.1g / t, the content of Ag is 6.7g / t, the content of Pb is 0.06%, the content of Fe is 2.3%, and the content of Si is 85.3%. / t, Ag3.1g / t; Take 500ml of the filtrate after activated carbon adsorption, add 10g of reduced iron powder, heat to 100°C, stir and react ...

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Abstract

The invention discloses a comprehensive recycling process for valuable metal roasting-cyaniding gold-containing tailing, belonging to comprehensive recycling and utilization of industrial solid waste. The process comprises the following steps: selecting hydrochloric acid, chlorine and sodium hypochlorite as a leaching agent to leach gold, silver, iron, lead and arsenic to the maximum extent; adsorbing gold and silver with activated carbon, removing and recycling arsenic and lead through a series of solid-liquid separation and conversion, evaporating and crystallizing a ferric chloride solution subjected to impurity removal, thus finally producing a ferric chloride hexahydrate product, and realizing the comprehensive recycling process for valuable metal in the tailing. For the process, the available raw material sources are wide, the processing cost is low, the step-by-step impurity removal is thorough, all the impurities are recycled, no secondary pollution is generated, and the comprehensive recycling process can be used for fully realizing clean production, is environment-friendly and convenient for industrial production and has good promotion and application values.

Description

technical field [0001] The invention belongs to a method for comprehensive recovery and utilization of industrial waste residues, in particular to a roasting-cyanidation comprehensive recovery process for gold-containing tailings. Background technique [0002] Roasting - Cyanide gold tailings are the tailings that remain after gold extraction. Roasting-cyanidation method is one of the main gold extraction processes in my country in gold production in my country. 90% of the smelting enterprises in the gold industry adopt this process. Sulfation roasting, leaching copper with dilute sulfuric acid, recovering copper from the acid leaching solution, adjusting the acid leaching residue to alkaline, leaching gold with sodium cyanide, replacing the leaching solution with zinc powder to recover gold and silver, and the leaching residue after washing is roasting— - Cyanide tailings. This kind of tailings (more than 35% iron content) is mainly used as an additive in the cement industr...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/10C22B3/24C22B3/44C22B11/00C22B13/00C22B30/04C01G49/10
CPCY02P10/20
Inventor 田文学苗文胜池吉安
Owner 田文学
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