Magnetic separation is an essential process in the production of quartz sand, which has the advantage of strong selectivity. The impurities removed mainly include strong magnetic minerals mainly composed of magnetite and weak magnetic impurities mainly composed of hematite, limonite and biotite. While effectively removing the impurities, a high output of quartz sand can be obtained. The application of magnetic separation technology can remove hematite, limonite, biotite and other weakly magnetic impurity minerals, including Liansheng particles. High intensity magnetic separation usually adopts wet high intensity magnetic separator or high gradient magnetic separator. Generally speaking, quartz with limonite, hematite, biotite and other weakly magnetic impurities can be selected by wet high intensity magnetic machine above 10000 Oster; It is better to use weak magnetic machine or medium magnetic machine to separate the strong magnetic minerals which are mainly magnetite.
Several principles of quartz sand magnetic separation technology
1、 Weak magnetic field before strong magnetic field
The mechanical ferromagnetism of quartz sand mixed in the crushing process is strong, so the weak magnetic separation equipment should be used to remove the weak magnetic impurities first, and then the strong magnetic separation equipment should be used to remove the weak magnetic impurities. If the content of strong magnetic substances is large, the strong magnetic substances are easy to block the strong separation channel and affect the separation index.
2、 Wet separation is used for fine particles
For fine-grained or micro fine-grained minerals, due to the enhanced interaction between particles, there are serious inclusions between magnetic and non-magnetic materials. If dry separation is used, it is difficult to remove the magnetic materials, so wet separation is generally required. In the case of wet separation, auxiliary means such as rinsing and pulsating can be added to destroy the inclusion between magnetic and non-magnetic materials, which effectively improves the probability of magnetic materials being captured by magnetic field.
3、 Dry separation can be used in high-precision separation
In the process of separation, try to let the material pass through the strong magnetic field area in a single-layer loose state. There is almost no inclusion between the non-magnetic material and the weak magnetic material. When the magnetic material passes through the strong magnetic field, it is easy to be captured. The iron removal precision is very high, but the processing capacity of this method is generally small.
4、 Select the appropriate separation size
The particle size of the material is very important to the separation effect. In the case of meeting the requirements of the product particle size, the iron removal operation should be carried out at the coarser particle size. Because the finer the particle size, the more times of crushing, the more mechanical iron mixed, the less processing capacity of the equipment, and the higher the production cost.
5、 Avoid the second mixing of iron impurities
The processing flow of non-metallic ore is relatively simple. After iron removal, crushing, screening and other operations should not be carried out as much as possible; In the process design, the iron removal operation of magnetic separation should be placed at the back as far as possible to avoid the secondary mixing of iron impurities.
The water-cooled electromagnetic slurry program-controlled automatic iron separator is a new type of high-efficiency magnetic separator. The deionized water circulates in the hollow copper tube through the circulating pump to take away the heat generated by the electrified copper tube. Based on this special structure, the water-cooled electromagnetic slurry automatic iron remover has the following advantages; The magnetic induction intensity is high; Low internal temperature and long working cycle; It has strong adaptability to ore feeding particle size and concentration, and high beneficiation efficiency; Easy operation and maintenance.
The water-cooled electromagnetic slurry program-controlled automatic magnetic separator is suitable for metal ore roughing and non-metal ore purification. Purification and impurity removal of quartz, feldspar, kaolin and other non-metallic minerals. Other industries: wastewater treatment of steel plant and power plant.