Chemical-biological purification method for quartz sand

Abstract

The invention discloses a quartz sand purification method for quartz sand. The method comprises steps as follow: (S1), breaking and screening; (S2), scrubbing; (S3), floatation: water is added to a material until the material becomes slurry and the concentration of the material reaches 22%-28%, a foaming agent is added, and acid liquor is added until the pH (potential of hydrogen) reaches 2.5; (S4), material feeding: a quartz sand discharging valve is opened, the acid liquor is added, then an acid liquor discharging valve is opened, the acid liquor is mixed with quartz sand constantly to form a hot acid-containing material, and the hot acid-containing material constantly enters an acid pickling container with a thermal-insulation layer on the outer wall; (S6), deacidification; (S7), microbiological leaching: water is added to the material obtained in the step (S6), so that the material is blended into quartz sand grout, microorganisms are added for leaching and iron removal operation, and a finished quartz sand product is obtained after drying. Leaching and iron removal are performed on the smashed quartz sand through alginate lyase producing bacteria, iron films or impregnated iron on surfaces of quartz sand particles can be removed, and the purity of the quartz sand is improved; meanwhile, continuous production of acidification and purification of the quartz sand is realized on the premise that high-quality purification of the quartz sand is guaranteed.

Description

technical field [0001] The invention relates to the technical field of preparation of high-purity quartz sand, in particular to a method for purifying chemical and biological quartz sand. Background technique [0002] High-purity silica is an extremely important optoelectronic material, which is widely used in high-tech fields such as semiconductors, optical fiber communications, lasers and aerospace. With the rapid development of these fields, the requirements for the content of impurities in high-purity silica are more stringent, and the demand for high-purity silica is also increasing. At present, most of the high-purity silica needed in my country depends on imports. Therefore, the use of quartz sand purification technology to obtain high-purity silica is an effective way to meet the demand for high-purity silicon in my country's high-tech fields, and it is of great significance to promote the development of my country's national economy. [0003] At present, there are...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two commonly used methods for pickling and purifying quartz sand. The quartz sand is soaked statically in inorganic acid solution at room temperature for several days to more than ten days; or the quartz sand is fluidized in inorganic acid solution for 2- 8 hours, all of which are intermittent production, which affects production efficiency; simply soaking in acid solution cannot completely remove metal impurities on the surface of quartz sand, and the purification effect of quartz sand is poor