Method for extracting gold from auriferous ores through potassium ferricyanide

A technology for potassium ferricyanide and gold ore is applied in the extraction field to achieve the effects of less environmental pollution, less equipment requirements and saving gold leaching cycles

Inactive Publication Date: 2013-09-11
CHENGDU UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

But, the research that potassium ferricyanide is directly used as leaching agent to extract gold has not been reported so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] Example: The process of extracting gold from potassium ferricyanide:

[0016] A flotation refractory gold concentrate in Sichuan (including 58.5g / t gold, 36.85% sulfur, 7.45% arsenic, and 1.04% carbon) was ground to 0.074mm; roasted at a certain temperature and time; Add 60ml of K to the calcined sand 3 Fe(CN) 6 5%, CaO 2 It is 3g / L alkaline leaching solution, after leaching for a certain period of time at normal temperature, it is filtered to obtain a noble solution with a gold leaching rate of 94.5%, and the precious solution is recovered by metal reduction.

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PUM

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Abstract

The invention relates to a method for extracting gold through potassium ferricyanide. The method is characterized in that the gold is extracted from the auriferous ores under an alkaline environment at normal temperature and pressure with nontoxic ferricyanide serving as a gold leaching agent and calcium peroxide serving as a leaching adding agent; and the method is a completely novel cyanide-free gold leaching method. According to the method, some auriferous ores which are difficultly treated are preprocessed and then leached for 2 to 20 hours at a normal-temperature alkaline environment and under the conditions that the concentration of potassium ferricyanide is 2 to 15%, the dosage of CaO2 is 1 to 10g/L and the liquid-solid ratio is 2: 1 to 10: 1; and the leaching rate of the gold can reach more than 94%. The method is simple and reliable in process and high in gold leaching rate and nearly not pollutes the environment; the reaction is carried out at the alkaline environment, so that equipment is nearly not corroded, and the requirement and cost are low, and the method has an important industrial application prospect.

Description

technical field [0001] The invention relates to a method for extracting precious metal—gold from ore, in particular to a method for extracting gold by using potassium ferricyanide, which belongs to the field of gold extraction. Background technique [0002] At present, about 85% of the gold in the world is extracted by the cyanide method. The traditional cyanide method has the advantages of simple process, convenient operation, good adaptability, low production cost and mature technology. Gold is slow, has poor selectivity, and cyanide is highly toxic, which has serious safety and environmental pollution problems. With the increasingly stringent requirements of environmental pollution control laws and regulations, it is urgent to develop new effective, non-toxic, non-polluting, and more environmentally friendly gold leaching agents to replace cyanide, and improve the refractory gold leaching agent through new process conditions. Gold ore leaching rate. [0003] In recent y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08
Inventor 刘菁宋岷蔚俞海平王燕叶巧明曹春燕
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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