Comprehensive recovery of gold and valuable metals from tailings

Recently our gold mines, tailings gold grade manufacturers in 0. 5g / t more than the number of them, especially those old mines in the early development of gold, due to technical immaturity, backward production technology, tailings gold grade more High, some even as high as 4g / t or more, while the tailings also contain a certain amount of other valuable metals. For these tailings, a suitable process can be used to recover gold and comprehensively recover a part of valuable metals. This not only makes full use of mineral resources, but also obtains good economic benefits. A gold mine in southern China, since 1955, has more than stockpiling tailings 350,000 t, where the average grade of gold, antimony, tungsten were 4.2g / t, 0.8%, 0.18 %, metal reserves were 1.473t, 2517t 569t. According to the nature of the old tailings, a series of experimental studies by the Changchun Gold Research Institute have shown that flotation and recovery of some of the gold in the old tailings should be carried out by flotation, and the flotation tailings should be cyanated and leached to recover gold. Since most of the plutonium in the old tailings has been oxidized, the recovery rate is not high when the flotation is recovered, and the remaining plutonium still affects the cyanidation leaching. The institute uses a kind of MNP oxidant to oxidize and pre-cyanide the flotation tailings, and then obtain good results. Finally, the cyanide tailings are reused for flotation to recover tungsten. The recovery rates of gold, antimony and tungsten reached 81.18%, 20.17% and 61.00%, respectively. According to the production scale of 100t/d, only the calculation of gold can generate an annual output value of 11.46 million yuan. After deducting the cost, at least a profit of 5.88 million yuan can be obtained every year. If you add the output value of tantalum and tungsten, the profit will increase. Lingbao County is the second largest gold production county in China. According to the data, many mines use amalgamation -flotation process. The average grade of tailings discharged per year is about 1.2g/t. The ore in this area is mainly composed of yellow iron. For the type of mine, gold is unevenly embedded in medium and fine grains, and natural gold accounts for 60.11% of the total gold. After Guangzhou Nonferrous Metal Research Institute of the three kinds of research process tailings area has been the recovery of gold were found in the residual gold tailings mainly pyrite with students, and some finely ground mineral processing plant because of the thick, golden load Iron ore does not dissociate from the monomer, thus affecting the recovery of gold. A tailings (average grade 0.74g/t) which has been dissociated from most of the gold-bearing iron ore, using hydraulic classification, +74μm product is treated by spiral-shaker re-election process, -74μm product is flotation Processed, 49.05% gold can be recovered.


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