Process and Application of LONGi Automatic Magnetic Flotation Separator

Project brief

In January 2021, a mining company introduced two LJC-10000 (φ2000mm) type automatic magnetic separator produced by LONGi. The equipment is used for the last stage separation of the milling workshop 3660 of the mining industry.

The original beneficiation process of the plant uses two ends of grinding, three sections of magnetic separation, the introduction of magnetic levitation separator, magnetic levitation separator installed in the three sections of magnetic separator after.

It will be put into operation on February 1, 2021. After three days of commissioning, the first stage of application, when the concentration grade is 60%-61%, the highest concentrate grade can reach more than 67.5%;When the concentration grade reaches above 66%, the concentrate grade reaches the highest 70%.After March 10, 2021, the second stage of roughing experiment was carried out, the grinding size was from -200 mesh (65%) to -200 mesh (52%), the concentrate grade was stabilized above 66.5%, and the grinding amount was increased from 170t/h to 270t/h.

Operation data

In Phase I, the product grade up, after about three days of test run, the sample test results at the early stage of test run (2.1-2.3) are as follows：

The operation index of the LONGi automatic flotation magnetic separator

Stage 1: Data show that when the concentration grade is between 60%-61%, the concentrate grade can reach up to more than 67.5%;When the concentration grade reaches above 66.5%, the concentrate grade can reach above 70%.

Stage 2：Increase the production

After 10 March 2021, change the high frequency screen from 0.25mm to 0.4mm.After the test run after automatic setting of the equipment, the sample test results of (3.12-3.17) are as follows:

The operation index of the LONGi automatic flotation magnetic separator

The data of the second stage showed that when the particle size was roughened to 52% of -200 mesh, the concentrate grade could reach more than 66.5%.The grinding rate increased from 170t/h to 270t/h.

Automatic control

Automatic flotation magnetic separator has a button to start and stop function, can realize unmanned duty. After one key start, the equipment enters automatic adjustment state, which can adjust parameters such as concentrate valve opening degree and magnetic field intensity according to different ore quantity. In view of the abnormal state in the process of operation, it has automatic adjustment of running black, valve fault alarm, sensor fault alarm and other abnormal state processing functions, which can fully meet the requirements of automatic operation on site and greatly reduce the management cost.

General

After LONGi automatic magnetic separator was applied in this mining industry, the concentrate products were improved obviously and the tailings were of low grade. Under the running condition of coarse and extraction, the grinding output increased by 58%.The equipment has good reliability and stable operation.