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Comprehensive utilization of gold mine tailings
At present, China has more than 200 kinds of gold mining vessels, with an annual excavation volume of more than 70 million cubic meters. The annual bank tailings of the onshore selection plant matched with gold mining vessels amounted to 252,000 tons. These magnetic iron ore tailings contained, hematite, garnet, titanium, iron and the like, for recovery utilization. According to statistical surveys, the gold grade in the tailings of selected plants is generally higher.
In the past 10 years, various gold deposits have done a lot of work in the comprehensive utilization of tailings, which has achieved great results. The Ankang Gold Mine has undergone repeated trial and trial production, using a three-stage dry magnetic separation-shaker selection process. The iron concentrate was sorted from tailings by 1,700 tons, and the gold was recovered by 2.187 kg. The annual output value was 441,200 yuan. More than a year later, the total investment for processing tailings can be recovered.
The Hengnan gold mine in southern Shaanxi adopts a single 5c600m×600mm permanent magnet single-roller dry sorter with a field strength of 87.58kA/m. From the tailings, iron concentrates with a grade of 65%-68% can be sorted. The rate is up to 31.2%, and the annual production of iron concentrate is 1100t, and 1.5309kg of gold is recovered from the shaker to create a production value of nearly 300,000 yuan.
According to the nature of tailings, Hanyin Gold Mine selected a fine iron ore concentrate from tailings with a wet magnetic separator with a field strength of 135.35 kA/m. The iron concentrate grade is 65%. Since August 1992, the annual average production of iron concentrates is 1,700 tons, with an annual output value of 500,000 yuan. The mine also uses a screening-roasting-magnetic separation-shaker re-election process. According to preliminary estimates, it can produce 360t of ilmenite, 468t of garnet and 216t of magnetite that was not selected when iron was selected. Recycling 1.218kg of fine gold chips, the total output value can reach 1.7 million yuan.
The Changchun Institute of Geology has adopted a re-election-magnetic separation-magnetron static separation process for the characteristics of fine-grained gold in the tailings of selected plants. The total recovery rate of gold is over 85%, especially for magnetic fluid gold. The selection machine has a good effect on the recovery of fine grain gold. In the production test, the previous l0kg ash tailings were recovered by the machine, and 148.2 g of gold was selected, and the particle size was all below 0.2 mm. From July to October of 1988, in the selected plant belonging to the second and third battalions of the first team of the Luobei Armed Police Golden First Corps in Heilongjiang, the joint process was adopted, and the total of 664t of the two years and the tailings of the year were completely processed, and the gold was recovered. 2.2668kg, the recovery rate is over 85%. After deducting all costs and expenses, the total profit is 60,000 yuan. The institute also studied the comprehensive recovery of tailings from the Yangping Guansha Gold Mine Select Plant. Re-selection - magnetic separation (shaker magnetic separator and re-election simultaneous sorting) - strong magnetic separation - magnetic fluid static separation and re-selection - shaker magnetic separator - magnetization roasting - magnetic separation - magnetic fluid Static separation of two combined processes. The gold recovery rate is up to 97.43%, the iron recovery rate is 94.83%, and the zircon recovery rate is 79.2%. Estimated by 3t tailings per shift, 5.4kg of fine gold can be recovered every year, 129t of magnetite, 332t of hematite, limonite, ilmenite mixed iron ore, 1140g of zircon, annual profit of 89,000 yuan