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Example of iron recovery from gold tailings (sand gold mine in Yuehe area of ​​Shaanxi Province)
1. Magnetic-heavy combined recycling process
Southern Moon River running through Ankang, Hanyin two counties, five miles along the river, well-being, constant mouth, sand Hanyin four gold mines, nine gold dredger, processing plant on three rock. There are 21 kinds of minerals in the tailings produced by the gold mining ship and the onshore selection plant. The minerals are mainly composed of ferromagnetic minerals, supplemented by weak magnetic minerals, and mixed with trace amounts of non-magnetic minerals. only 4: magnetic iron ore (42%), hematite (18%), titanium ore (18%), garnet (17%) wherein aluminum garnet-based iron garnet. The iron ore-based iron concentrate is a strong magnetic mineral, which has the highest content in the gold tailings, generally 60%, and the content in the grain size is less than 90%.
Considering that the dust in the tailings of the plant has been re-elected (the gold mine is re-elected) medium-washed, the dry sorting process can be used to select iron concentrate, which can simplify the process equipment. Reduces dewatering, concentration and filtration operations, reducing floor space and ore dressing water.
Ankang Gold Mine adopts φ600×600 (214.97kA/m) permanent magnet single-roller dry sorter and CGR-54 type (1592.36kA/m) hydromagnetic counter-roller strong magnetic dry sorter according to the characteristics of the ore-guiding minerals. The two-stage dry magnetic separation process of separating magnetite, hematite (collectively called iron concentrate) and ilmenite and garnet from the tailings is shown in Figure 1. At the end of the process, it is added. Two XZY2100×1050 shakers are used to sort the gold in the mudstone waste rock. Using this process, Ankang Gold Mine can obtain 1700t of iron concentrate from the tailings of the plant, recovering 2.18kg of gold, iron concentrate with a conservative price of 136 yuan / t, gold with 96 yuan / g, the annual output value of 44.12 Ten thousand yuan.
Figure 1 Ankang gold ore separation iron concentrate process
The Hengkou Gold Mine in southern Shaanxi used a single φ600mm×600mm (87.58kA/m) permanent magnet single-roller dry sorter to sort iron concentrate from the tailings of the plant. The concentrate yield was 31.2%. The grade is 65%~68%. From the tailings, the iron concentrate can be produced at 1100t/a, and the shaker can be used to select 1.5309kg of sand gold to create a production value of nearly 300,000 yuan.
Second, magnetic separation - roasting - magnetic separation recovery process
According to the nature of tailings, Hanyin Gold Mine selected a wet magnetic separator with a field strength of 135.35kA/m to sort iron concentrate from tailings, and sorted tailings after iron concentrate to use roasting-magnetic separation process. The ilmenite and garnet are sorted out, and the production process is shown in Figure 2. 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. From this, 1.218kg of fine gold chips will be sorted, and the total output value will reach 1.7 million yuan.
Figure 2 Process for sorting ilmenite and garnet in Hanyin gold mine