title: Further purification of industrial quartz by much milder conditions and a harmless method.
abstract: A much "greener" and harmless leaching method for removing impurity aluminum further from industrial quartz sands by very dilute mixed acids has been presented. With the help of supersonic, the percentage of removal aluminum reached up to 52.5%/53%, that is, 17.4 ppm/17.7 ppm at 30 °C/80 °C, respectively. These results are 4.4/4.7 ppm lower than that supplied by a world famous quartz sands supplier, and the leaching conditions are much milder compared with other comparable methods: the concentration of hydrogen chloride in the mixed acid is only 10% of the others, the leaching temperature is much lower; at the same time, the operating time is only 13-20% of the others, thereby pollution of industrial strong acids and thermo-scattering is reduced substantially.
authors.affiliation: School of Chemistry and Chemical engineering, Jiangsu University, Zhenjiang 212013, PR China. jli5154@ujs.edu.cn
authors.forename: Jing-sheng
authors.initials: JS
authors.lastname: Li
authors.forename: Xiao-xia
authors.initials: XX
authors.lastname: Li
authors.forename: Qin
authors.initials: Q
authors.lastname: Shen
authors.forename: Zhi-zhen
authors.initials: ZZ
authors.lastname: Zhang
authors.forename: Fei-hu
authors.initials: FH
authors.lastname: Du
mesh_terms: D006851:Hydrochloric Acid / Q000737:chemistry; D011791:Quartz / Q000302:isolation & purification*
chemical_list: D011791:Quartz; D006851:Hydrochloric Acid