Analysis of two factors affecting the magnetic separation effect of a magnetic separator:

(1) The most important factor affecting the magnetic separation effect of a magnetic separator is the feed particle size.

For most ores, the particle size of the feed indicates the degree of separation between individual mineral particles and gangue particles. Therefore, the minerals fed into the magnetic separator must achieve sufficient individual separation. For ores with coarser intercalation, it is sufficient as long as the minerals and gangue have achieved individual separation; the particle size does not necessarily need to be too fine. Sometimes, although the particle size of such ores is coarser, the separation quality is not low. The main reason is that because the intercalation of the ore particles is coarse, the useful minerals and gangue will separate after grinding to a certain extent.

Pulp concentration is one of the main factors affecting the magnetic separation effect of a magnetic separator, mainly referring to the overflow concentration of the classifier.

If the pulp concentration is too high, resulting in excessively high separation concentration, it will seriously affect the concentrate quality. This is because at this time, the concentrate particles are easily covered and wrapped by finer gangue particles, making them difficult to separate and causing them to be separated together, thus lowering the grade. If the pulp concentration is too low, the separation concentration will be too low, which will increase the flow rate and shorten the separation interval. This will cause some fine magnetic particles that should have been separated to fall into the tailings instead, increasing the tailings grade and resulting in losses. Therefore, the pulp concentration must be adjusted according to the needs. At the magnetic separator, the adjustment is mainly made by adjusting the amount of water blown into the ore.

(2) The size of the working gap of the magnetic separator also affects the magnetic separation effect.

The working gap of the magnetic separator is the distance between the cylinder and the tank. This distance is one of the factors affecting the quality of the separated concentrate. If the gap is too small, meaning the distance between the cylinder and the tank is too close, the slurry will not pass smoothly, affecting the throughput. Furthermore, because the gap is too small, particles of all magnetic strengths will have ample opportunity to be attracted to the cylinder. This is mainly due to the slurry being too close to the magnetic field, resulting in a very high magnetic field strength. However, this is beneficial for reducing the tailings grade and increasing the recovery rate. If the gap is too large, only the stronger magnetic particles will be selected, while weaker particles will not be selected. Although the concentrate grade is increased, the tailings grade is also increased, reducing the recovery rate. Therefore, adjusting the working gap is very important. In on-site production, the working gap is generally adjusted to the range of 35-60mm as needed. The working gap can be adjusted by using the shims under the angle steel of the support frame.