Vanadium-Ilmenite Ore Processing Technology and Its Advantages

Vanadium ilmenite is a solid solution separation mainly composed of magnetite. The main elements are iron, titanium and vanadium. Compared with single magnetite, vanadium-titanium magnetite is a ferrimagnetic ore with larger remanence and higher coercive force. The following will introduce the processing technology of vanadium-ilmenite ore and its advantages.

·Process Flow:

1. Feed the crushed raw ore into a ball mill in a grinding and classification closed circuit, and feed the graded overflow of a section with a particle size of -200 mesh of 40% to 50% into a roughing magnetic separator. The tailings are from the roughing magnetic separator and the rough magnetic separator concentrates are demagnetized and fed into the second stage of classification. The sand returned from the second stage classification is fed into the second-stage ball mill. The second-stage ball mill discharges the ore and returns to classification, and the particle size is ground to -200 mesh accounting for 65%-95% of the second-stage classification overflow is fed into the magnetic separator, and the tailings of the magnetic separator are the final tailings.

2. After demagnetization, the concentrate of the magnetic separator is fed into a high-frequency fine mesh vibrating screen. The recommended screen size is 0.074-0.15mm. Different size screen holes can be used according to different feeding conditions, so that the amount of return on the screen can be controlled. The best effect is when the amount is 20% to 30% of the screen feeding amount. Optimized grinding and classifying operations can effectively improve its effect and reduce over-grinding. Tests have proven that magnetic separation of concentrates using fine screening classification technology can improve the concentrate grade.

3. The ores from high-frequency fine mesh vibrating screen is returned to the ball mill, and the fine screen is fed into the magnetic separation column. The magnetic separation column uses an adjustable electromagnetic excitation pulsating magnetic field, which is much lower than the magnetic field intensity of the magnetic separator. It greatly reduces the remanence and coercive force of the vanadium titanium magnetite in the separation area, and reduces the phenomenon of magnetic agglomeration.

The lower concentration and pulsating magnetic field in the processing area can effectively disperse the magnetized magnetic agglomeration of magnetite and separate the monomer gangue, slime and poor conjoined bodies contained therein. The continuously downward larger magnetic field force allows a larger rising water velocity and produces a larger tailings separation force in the opposite direction to the magnetic force. The large rising water flow causes the even rich biomass to enter the magnetic separation column tailings, and then enter the second-stage classification operation for further grinding, dissociation and re-processing, which can achieve the goal of improving the concentrate grade and mineral recovery rate, thereby reducing the tailings mineral grade. The amount of intermediate ore is controlled by rising water flow velocity and magnetic field intensity. The best effect is achieved when the amount of intermediate ore is controlled at 10% to 20% of the ore feed rate of the magnetic separation column. The ore in the magnetic separation column returns to the second-stage for classification, and the magnetic separation column concentrate is used as the final concentrate.

·Advantages of the process:

Since the second-stage classification overflow can throw away some qualified tailings in advance after magnetic separation, it can effectively reduce the feeding amount of ore to the high-frequency fine mesh vibrating screen, and achieve the goal of effectively improving the efficiency of fine screen classification and second-stage grinding. At the same time, through the fine screen classification, the coarse particles are returned to the continuous body for re-grinding to improve the grade of the concentrate and stabilize the quality of the concentrate.

In addition, the fine screening reduction in the amount of ore fed can reduce the ore on the screen, thereby reducing the processing capacity of the second-stage ball mill and reducing energy consumption. The magnetic separation column uses magnetic force and gravity to jointly separate. Compared with the magnetic separator, most of the magnetic separation column separates the field strength between the selected areas is less than 20KA/m, while the field strength of the selected magnetic separator is 100-120KA/m. The reduction in magnetic field intensity makes the coercive force and magnetic agglomeration phenomenon much lower, and the dispersion effect of the magnetic separation column reduces the concentrate grade. It can be increased and the operation recovery rate can be also increased.

The vanadium-ilmenite ore beneficiation process improves concentrate quality and resource utilization, while reducing the silicon content in the iron concentrate, which is beneficial to iron and steelmaking and has high economic and social value.