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Click to add WeChatIlmenite is the main raw material for the production of titanium and titanium dioxide. my country's ilmenite reserves rank first in the world. However, due to the lack of economical and effective processing technology for fine-grained ilmenite with a particle size of less than 0.045 mm, a large amount of fine-grained titanium minerals are discharged into the tailings, resulting in a waste of titanium resources. If you want to improve the recovery rate of ilmenite concentrate, the choice of beneficiation process is very important. Let us explain several common ilmenite beneficiation process methods.
At present, the commonly used ilmenite beneficiation process methods include flotation method, magnetic separation-flotation combined method, suspension vibration gravity separation-flotation combined method and classification separation method.
There are two main research directions for ilmenite flotation. One is to change the surface properties of ilmenite before flotation, such as scrubbing-flotation and microwave-flotation. Scrubbing-flotation is to scrub the ilmenite, which will increase the content of ferrous ions on the surface of ilmenite, and then some ferrous ions will be converted into trivalent ferrous ions, which will increase the active particles on the surface of ilmenite; microwave-flotation is to use microwave irradiation to ilmenite, which not only reduces the amount of sodium oleate, Pb(NO3)2 and acidified water glass by 50%, but also increases the recovery rate of ilmenite by about 3.17%.
The other is to use new flotation technology for separation, such as flocculation flotation and carrier flotation. Among them, flocculation flotation has higher selectivity than conventional flotation, and the process and equipment are relatively simple. The carrier flotation process can reduce the amount of reagents used, and the recovery rate of -0.020 mm fine-grained ilmenite is higher.
The magnetic separation and flotation combined beneficiation method is to first use the SLon-1500 magnetic separator to discard the tailings and obtain a rougher concentrate with a TiO2 grade of 21.23% and a recovery rate of 76.24%. Then, the flotation method is used, using the floating MOS collector and CMC and water glass as inhibitors, and after four rounds of selection processes, a rougher selection, a scavenger selection, and a scavenger selection, titanium concentrate is obtained.
The combined separation process of suspension vibration gravity separation and flotation can obtain titanium concentrate with a TiO2 grade of 47.20% and a recovery rate of 60.00%. In addition, suspension vibration gravity separation can reduce the content of -0.019 mm particle size in fine-grained ilmenite and reduce the impact of ore mud on flotation effect.
Whether it is the combined method of magnetic separation-flotation or the combined method of suspended vibration gravity separation-flotation, the role of magnetic separation or suspended vibration gravity separation is to discard most of the gangue and -0.010mm particle size ilmenite, reduce the sludge content in the slurry, and improve the slurry environment of flotation.
The classification selection method mainly adopts the classification magnetic separation-classification flotation process. When this process treats a certain -0.038 mm particle size ilmenite, the titanium distribution rate can reach 40.08%. After classification and roughing, it is more conducive to the recovery of fine-grained ilmenite. At the same time, it can reduce the adverse effects of fine-grained ilmenite on flotation.
The above is an introduction to the common ilmenite beneficiation methods. In the actual beneficiation process, due to the differences in the properties of different ilmenite ores, the process selection cannot be generalized. Targeted research is required. Designing a suitable and reasonable process plan through beneficiation tests is the key to obtaining ideal ilmenite concentrate recovery.
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