Method for removing impurities from natural quartz sand

Abstract

The invention discloses a method for removing impurities from natural quartz sand and relates to the technical field of removing impurities from the quartz sand. The method for removing the impuritiescomprises the specific steps that quartz sand particles with the fineness of 60-100 meshes are subjected to magnetic separation by a dry type magnetic separation machine, and the magnetic field strength of the dry type magnetic separation machine ranges from 120 mT to 600 mT; first-stage flotation and second-stage flotation are carried out, the dewatered quartz sand is conveyed to a scrubber, anda catalyst and oxalic acid liquid with the concentration of 3%-18% are cyclically added to the scrubber, the addition of the catalyst and oxalic acid is 0.5%-3% of the mass of the quartz sand entering the scrubber, and then the pickled quartz sand is filtered out; and acid removing and drying and packaging are carried out. According to the process, flotation and magnetic separation methods are adopted, and non-magnetic associated impurities and magnetic impurities such as feldspar and mica of the quartz sand can be effectively removed, so that the acid-pickled quartz sand is purer and higherin quality, the process is simple, the impurity removal effect is good, and the purity of the quartz sand can reach more than 99.9% by adopting the impurity removal method.

Description

technical field [0001] The invention relates to a method for removing impurities from natural quartz sand, which belongs to the technical field of removing impurities from quartz sand. Background technique [0002] Quartz sand is a kind of quartz particles obtained by crushing and processing quartz stone. Quartz stone is a non-metallic mineral. It is a hard, wear-resistant and chemically stable silicate mineral. Its main mineral component is SiO 2 , the color of quartz sand is milky white or colorless translucent, quartz sand is an important industrial mineral raw material, non-chemical dangerous goods, widely used in glass, casting, ceramics and fireproof materials, smelting ferrosilicon, metallurgical flux, metallurgy, construction , chemicals, plastics, rubber, abrasives, filter materials and other industries. [0003] Since quartz ore is a massive aggregate composed of quartz and a large number of impurity minerals, in order to remove these impurity minerals, these impu...

AI Technical Summary

Problems solved by technology

However, in this way, the so-called eutectic phenomenon will occur when quartz minerals are symbiotic with feldspar, mica and other minerals. The initial melting temperature of the mixed system can be reduced to about 700°C, while the current roasting temperature for quartz ore is generally 900°C. In this way, the ore after roasting has been partially melted, and the vitreous quality formed by melting will be firmly covered on the quartz surface, which is difficult to remove. Because these vitreous substances contain a large amount of metal element impurities, they are high-purity The production of quartz sand poses difficult problems

[0004] And at present, in the process of preparing quartz sand in my country, a large amount of acid is used for pickling, and the acid solution of quartz sand after pickling often remains on the surface of quartz sand, which will also affect the subsequent processing procedures, so it is necessary to pickle the quartz sand Deacidification

The traditional deacidification process only uses a large amount of water to rinse. For the quartz sand that has been soaked in a large amount of concentrated acid, especially after pickling with hydrochloric acid or nitric acid, the cleaning is often not thorough enough, and residual chloride ions or nitrate ions remain in the pickling. The surface of the quartz sand also makes the color of the pickled quartz sand turn yellow, and the poor appearance affects the value of the product and may also affect its processing performance. Therefore, it is urgent to find a method for deacidifying the pickled quartz sand, which can completely remove the remaining Pickling the impurity ions such as chloride ions or nitrate ions on the surface of the quartz sand makes the quartz sand more pure and whiter in color