Difficult to choose magnetic hematite tailings treatment technology

Our section to the main magnetic hematite mine, because the ore weathered, resulting in large clay beneficiation process, selected iron taste between 35% to 45%, a large number of abandoned tailings are stacked, in order to improve Iron recovery requires the recovery of tailings, which are mainly brown and hematite.

After the selection, the size of the tailings is below 6mm. Due to the weathering reasons, the mud content is large and the sediment is difficult to settle. The limonite is the main iron mineral, including a small amount of hematite and magnetite. The gangue mineral contains pyroxene. , quartz , kaolin, etc. In the process, the magnetic separation-reverse flotation combined process in the stage grinding stage is used to select the refractory minerals mainly composed of limonite. The specific process is that the tailings are dried and fed by the electromagnetic vibrating feeder, and the belt conveyor is sent to a section. Grinding, a section of grinding uses a lattice ball mill and a classifier closed circuit, the classifier overflow fineness of less than 200 purposes accounted for 60%, through weak magnetic-strong magnetic to obtain iron concentrate. The coarse concentrate enters the second stage of grinding, and the second stage of grinding uses a cyclone and an overflow ball mill to close the road. The fineness is -200 mesh 90% cyclone overflow into the second stage weak magnetic-coarse-selection The magnet concentrate is obtained, the tailings enters the second section of the strong magnetic separator, the strong magnetic separation concentrate is fed to the reverse flotation operation to improve the quality and reduce the impurities, and the reverse flotation process is a coarse and a fine sweep.

The phase grinding and reverse flotation combined process selection process is used, and its feasibility and advantages are analyzed as follows:

1. The first stage of grinding is centered on the recovery rate. The focus of the grinding is the dissociation of the majority of the target iron minerals from the gangue and non-target iron minerals (iron silicate, etc.). The magnetic separation maximizes the recovery. The purpose is iron mineral monomer and rich life. A section of grinding selection loses about 65% of the tailings, and the iron concentrate has about 38% of the coarse concentrate into the second stage of grinding, which greatly reduces the second section of grinding and reduces the second section of grinding cost.

2. The pulsating high gradient magnetic separator is used for rough selection of weak magnetic minerals such as red limonite, not only a large number of tails, but also a large number of primary secondary slime, which creates conditions for reverse flotation operations. The successful application played a crucial role.

3. The high-efficiency jet flotation machine is used for the reverse flotation of the second iron concentrate to improve the quality and reduce the flotation. The equipment uses the principle of downward high-speed jet to mineralize flotation, and the flotation layer is thick. The enrichment is high, and the anti-floating process only has one rough and one sweep, which simplifies the process. The iron concentrate grade is 53%, which is 2% higher than the test. Compared with the mechanical agitating flotation machine, the bottom area is saved by 60%. Save 40% on mechanical investment and save 55%. The reverse flotation adopts low temperature resistant ether amine collector, and the slurry temperature can be normally floated at about 8 degrees Celsius, which saves the slurry heating cost.

4. The second section of the classifier uses a water conservator. Due to the mud content of the selected materials, the water content is large, and the original ore bin often has a blockage phenomenon. The ore supply is unstable, causing frequent fluctuations in the ore slurry volume and ore volume. The cyclone overflows and runs thick, and the grade of the reverse flotation iron concentrate is affected by the coarse grain continuous body, and the grade is low. A high-frequency sieve screen is set up to screen out the coarse-grade low-grade iron ore of the reverse flotation concentrate ore and return to the second stage of grinding. The anti-flotation concentrate is stable at more than 53%.

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