Magnetic separation is an indispensable process in the production process of quartz sand. Its advantage is strong selectivity. The impurities removed are mainly strong magnetic minerals such as magnetite and hematite, limonite, and biotite. The main weak magnetic impurity mineral, while maintaining the effective removal of impurities, can also obtain a high yield of quartz sand. The use of the magnetic separation process can remove weak magnetic impurity minerals such as hematite, limonite, and biotite, including conjoined particles, to the greatest extent. Intensive magnetic separation usually adopts a wet strong magnetic separator or high gradient magnetic separator. Generally speaking, the quartz whose impurities are mainly weak magnetic impurity minerals such as limonite, hematite, biotite, etc., it can be selected by using a wet strong magnetic machine at a temperature of more than 10,000 guass; For the main strong magnetic minerals, it is better to use a weak magnetic machine or a medium magnetic machine for sorting.
Several Principles of Quartz Sand Magnetic Separation Technology
1. Weak magnetism first and then strong magnetism
The mechanical ferromagnetism mixed in quartz sand during the crushing process is strong, so it should be removed by weak magnetic separation equipment first, and then the weak magnetic impurities in it should be removed by strong magnetic separation equipment. In addition to iron, strong magnetic substances are easy to block the strong separation channel and affect the separation index.
2. Wet sorting is used for fine particles
For fine-grained or fine-grained minerals, due to the enhanced mutual adsorption between the particles, the magnetic and non-magnetic substances are seriously mixed. If dry separation is used, it is difficult to remove the magnetic substances. Generally, a wet method is required. In the case of wet separation, auxiliary methods such as rinsing and pulsation can usually be added to destroy the inclusions between magnetic and non-magnetic substances, effectively increasing the probability of magnetic substances being captured by the magnetic field.
3. Dry sorting can be used in high-precision sorting
When removing iron and purifying high-purity non-metallic ores with relatively coarse particle size, the thousand-type strong magnetic separation method can be used. There is almost no inclusion between the weak magnetic material, the magnetic material is easily captured when passing through a strong magnetic field, and the iron removal precision is very high, but the processing capacity of this method is generally small.
Fourth, choose the appropriate sorting granularity
The particle size of the material is very important to the sorting effect. Under the condition that the particle size of the product is met, Jinxing will carry out the iron removal operation at coarser particle size. Because the finer the particle size, the more crushing times, the more mechanical iron is mixed in, the processing capacity of the equipment is also reduced, and the production cost is increased.
5. Avoid secondary mixing of iron impurities
The processing flow of non-metallic ore is relatively simple. After the iron removal operation, try not to perform operations such as crushing and screening; in the process design, the magnetic separation iron removal operation should be placed as far back as possible to avoid secondary iron impurities. mix in.
A water-cooled electromagnetic slurry program-controlled automatic iron remover is a new type of high-efficiency magnetic separator. The deionized water is circulated in the hollow copper tube by the circulating pump, and the heat generated by the electrified copper tube is taken away. Based on this special structure, the water-cooled electromagnetic slurry automatic iron remover has the following advantages: high magnetic induction intensity; small internal temperature, long working cycle; strong adaptability to ore feeding particle size and concentration, high ore beneficiation efficiency; convenient and simple operation and maintenance.
A water-cooled electromagnetic slurry program-controlled automatic magnetic separator is suitable for roughing of metal ores and purification of non-metallic ores. Purification and impurity removal of non-metallic minerals such as quartz, feldspar, and kaolin. Other industries: Wastewater treatment in steel plants, power plants.
