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The technology has not been reported at home and abroad, and the project evaluation conducted by Academician Jin Yong believes that the technology has reached the international advanced level. The project appraisal hosted by the Ministry of Education believes that the project is advanced and feasible, with obvious innovation and high economies of scale.
With the deepening of gold mining, the output of refractory gold mines is getting larger and larger. Using traditional cyanidation method to raise gold, a large amount of gold smelting tailings with high gold content will be produced. In the prior art has been published or disclosed in the patent literature, for refractory gold concentrate smelting or gold tailings, particularly those containing arsenic sulfide compound or more refractory gold concentrates, generally used in the art can be industrialized The calcination method can increase the recovery rate of gold and recover sulfur, but the recovery rate of gold is limited, and a large amount of pollution residue is generated, and arsenic is also difficult to handle. Pyrite tailings containing most of the higher take-away to cement, as cement materials, polluting sulfur, arsenic and lead. If stacked near the smelter will produce spontaneous combustion, will produce soot pollution, cyanide with natural rain water into the groundwater, causing environmental degradation. To this end, the catalytic oxidation process is used to treat refractory gold concentrates and tailings. This method uses a catalyst to oxidize gold cyanide tailings with oxygen in the air under normal pressure to extract compounds of metallic silver , metallic copper and lead. Zinc compounds, iron pigments, etc., while extracting gold. After treatment, the sulfide and arsenide in the gold slag are catalytically oxidized, increasing the probability of gold contacting the catalyst and increasing the recovery rate of gold. At the same time, it can also comprehensively recover silver, copper, lead, arsenic, etc., and use the iron to produce transparent ultra-fine iron red, and various pollutants also become non-polluting substances.
The residual amount of tailings after catalytic oxidation is about 20%, and some are less than 5%, and can be comprehensively utilized. The recovery rate of gold, silver and iron in the same iron box reaches 99%. Therefore, the method not only solves the problem of low recovery rate of gold concentrate containing high sulfide or arsenide, but also maximizes the recovery rate of valuable metals, and solves the problem of difficult handling of gold smelting tailings.
In addition, the successful development of this technology is conducive to improving the backward cyanide gold extraction process, improving the level of science and technology, enhancing the competitiveness of enterprises in international trade, and increasing employment.
The technology has been implemented in the Penglai gold smelter. It is expected to treat 30,000 tons of cyanide tailings, invest 50 million yuan, and the company will receive 30 million yuan in benefits.
Gold smelting cyanide tailings for gold extraction and comprehensive utilization
Name achievements: gold smelter tailings cyanide gold extraction and utilization Applicant: Tsinghua University Identification Number: Kam word [teaching SW2003] Identification No. 008 Date: September 7, 2003 Subject: About the outcome of the civil water: