Mining and processing are inseparable from beneficiation. Knowing the rationally designed beneficiation process can achieve the best results with the lowest investment. Commonly used ore dressing methods include gravity separation, flotation, and magnetic separation.
Re-selection method： Re-selection is to use the difference in relative density, particle size, and shape of the mineral particles to be sorted and the difference in the speed and direction of movement in the medium (water, air, or other liquids with relatively high density) to make them mutually Separated beneficiation method. (The difficulty of gravity separation of the two minerals depends on the density of the two minerals and the medium)
The necessary conditions to realize the re-election method:
1. There must be a density difference between the ore grains;
2. The sorting process is carried out in a moving medium;
3. Under the combined action of gravity, fluid power, and other mechanical forces, the granular ore clusters are loose and stratified according to density;
4. The materials separated into layers are separated under the handling of the moving medium, and different final products are obtained.
Commonly used equipment for flotation: according to different charging methods, flotation machinery can be divided into three categories: mechanical agitating flotation machine, compressed air flotation machine, and variable pressure flotation machine.
Flotation method: According to the different physical and chemical properties of the surface of mineral particles, according to the difference of mineral floatability, the buoyancy of bubbles is used to separate the minerals from the slurry and leave the useless minerals (ie gangue minerals) in the slurry as tailings. discharge. Among natural minerals, except for individual minerals (graphite, natural sulfur, molybdenite) and coal, most natural minerals have poor floatability, and the wetting properties of the mineral surface must be controlled artificially.
Magnetic separation method: Magnetic separation is a method of separation in the magnetic field of the separator by using the magnetic difference of various minerals.
Commonly used equipment for magnetic separation: wet permanent magnetic cylinder magnetic separator, magnetic drum, weak magnetic separator of the dry magnetic separator; magnetic roller type strong magnetic separator, high gradient magnetic separator, strong magnetic separator.
Necessary conditions for magnetic separation:
1. The magnetic difference between mineral particles;
2. There must be a non-uniform magnetic field with sufficient magnetic field strength and magnetic field gradient;
3. The magnetic force is greater than the mechanical force (magnetic mine), and the mechanical force is greater than the magnetic force (non-magnetic mineral particles).
