Research on Comprehensive Recovery of Siderite

The ore in the primary zone of Fenghuangshan Copper Mine belongs to a mixed ore of a symbiotic combination of chalcopyrite pyrite magnetite siderite hematite. The original design process of the beneficiation plant was to first flotation copper and sulfur after grinding, and recover strong magnetic material mold and dies using weak magnetic separation. After the magnetic separation tailings were graded,+37pm was used for underground filling, and -37pm was discharged into the tailings pond. The large amount of siderite contained in tailings has not been recycled. In order to strengthen the further comprehensive recovery of resources, a detailed study was conducted on the full tailings of Fenghuangshan Copper Mine. The experimental results indicate that the Shp wet high magnetic machine is used to recover siderite, and the_ Through the secondary roughing and primary selection processes, an iron concentrate with an iron content of about 44% (58% after loss on ignition) and a recovery rate of 30% can be obtained. The mine processes 550000 tons of ore annually and can recover nearly 70000 tons of iron concentrate annually, which can be supplied to Tongling Nonferrous Metals Company to solve some of the raw material sources in the national circular economy iron pellet project.
1、 Brief Description of Ore Properties
The Fenghuangshan Copper Mine mainly consists of copper bearing skarn ore and copper bearing magnetite ore. The copper ore is mainly chalcopyrite, the sulfur mineral is mainly pyrite, and the iron mineral is magnetite, siderite, hematite, etc. The main chemical composition of tailings after flotation and weak cnc machining 6061 t1 electromagnetic clutch parts separation is shown in Table 1, and the iron phase is shown in Table 2.
Metal minerals in tailings include siderite, hematite, magnetite, pyrite, chalcopyrite, and gangue minerals include quartz, chalcedony, garnet, calcite, dolomite, etc. According to the analysis of mineral embedding particle size and monomer dissociation degree, at a particle size of -0.074mm accounting for 69.5%, about half of the iron minerals and gangue minerals are still associated, with siderite mostly associated with silicate gangue minerals. Hematite is associated with both silicate and carbonate minerals. Magnetite is often associated with quartz and chalcedony minerals, and their embedding relationship is very complex. By measuring the magnetic minerals in tailings, the content is about 1%. The sample collected in the experiment is a complete tailings sample from Fenghuangshan copper parts Mine. The sample is taken in stages and batches based on the production process, and then mixed and prepared, which has good representativeness. The sample contains 21.48% iron.
2、 Process Plan Selection
Reverse flotation is suitable for selecting iron ore or coarse concentrate with low content of quartz, silicate, or other gangue minerals. It utilizes the difference in natural floatability between quartz or silicate and magnetite or hematite for reverse flotation. The combination reverse flotation tests of anionic and cationic collectors and inhibitors were explored separately, and the results showed that ideal separation effects were not achieved. This may be due to the flotation of siderite along with quartz and other gangue minerals during reverse flotation. Therefore, the reverse flotation scheme is not advisable.
In addition, various fatty acid collectors were also used for positive flotation tests in neutral and alkaline slurries, but the separation purpose was not achieved.
Therefore, the magnetic separation scheme is still used to test the ore.
Option 1: The iron concentrate is directly obtained through rough selection of the ore feed. The conditions for rough selection are: magnetic field strength of 240kA/m, ore feed concentration of 33%, flushing water of 1.08m3/h, magnetic separator disc speed of 4r/min, tooth gap of 5mm, resulting in an iron grade of 43.54% and an iron recovery rate of 15.49%.
Option 2: Feed Mine Manager