Efficient magnetic separation method for quartz sand

Abstract

The invention discloses an efficient purification method for quartz sand. In the method, two-section smashing (rough smashing and fine smashing) and ore milling with a rod mill are adopted, so that the production capacity is increased greatly, unit energy consumption is lowered, and the method is suitable for large-scale production. A method for removing weakly-magnetic minerals and intergrowth quartz with high iron content from quartz sand through advanced ore washing and weakly magnetic-high gradient strongly magnetic combined magnetic separation before ore milling is adopted, so that the purity of quartz sand is increased greatly. The method has the advantages of simple process flow, easiness for operating, low cost, high purification efficiency, stable performance and environmental friendliness of a produced product, no use of any chemical substance in an entire production process, no production of any waste water, waste residues and waste gas, true realization of zero emission, no production of waste and prevention of pollution. The method is not limited by the production scale, various quartz sand products of low, medium and high grades can be produced, the enterprise profit can be maximized, and the method has a wide application prospect on the aspect of purification of quartz sand.

Description

technical field [0001] The invention relates to a purification method of quartz sand, in particular to a high-efficiency magnetic separation method of quartz sand. Background technique [0002] Quartz sand is an irreplaceable basic material in the development of national strategic and pillar industries, and is widely used in high-tech fields such as glass, photovoltaics, optoelectronics and aerospace. With the rapid development of these fields, the demand for quartz sand is increasing day by day, and good quartz ore resources are gradually depleted with the continuous mining of the years. How to comprehensively utilize ordinary quartz sand resources through purification is very important. [0003] Traditional purification methods are mainly realized by flotation, acid leaching, traditional magnetic separation and other methods. Both acid leaching and flotation must add chemical substances during the processing. These chemical substances not only have hidden dangers in term...

AI Technical Summary

Problems solved by technology

Both acid leaching and flotation must add chemical substances during the processing. These chemical substances not only have hidden dangers in terms of environmental protection, but also the acidic or alkaline agents added in the produced quartz sand products will affect the subsequent production process. The process and equipment are affected to varying degrees, and the production process is affected by many factors such as temperature, concentration, PH value, etc., and the production operability is poor, which is not favored by enterprises.

[0004] Most of the traditional purification methods use a large number of strong magnetic rods (the surface field strength is about 0.8 Tesla) to be manually cleaned in the ditch to achieve the purpose of iron removal. Affected by many human factors, it is difficult to control production

Due to the small magnetic force and the inability of the material to fully contact the surface of the cylinder, the drum magnetic separator has poor iron removal effect when producing this type of quartz sand.

Moreover, whether it is a strong magnetic bar or a drum magnetic separator, the magnetic field will attenuate as the use time increases.

[0005] In addition, due to the imperfect process and backward equipment of traditional purification methods, not only is it difficult to scale up production, but it is also difficult to achieve significant results in purification.

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