关键词: 光伏用砂　, 石英提纯　 , 磨矿　 , 高梯度强磁选　, 酸浸 

Abstract: The SiO2 content of a quartz sand ore in Western Hunan Province is as high as 99. 01%,and the main impurities Fe2O3 ,Al 2O3 and TiO2 contents are 0. 082%,0. 64% and 0. 03%,respectively,exceeding the requirements for the content of secondary products of siliceous raw materials for photovoltaic glass. In order to determine the development and utilization process of this ore,the crushing and grinding-strong magnetic separation-acid leaching process technology research was carried out on the basis of process mineralogy research. The results showed that:① the ore samples are in the form of chips,the particle size is mostly in the range of 2. 0~ 0. 5 mm;The chips are composed of sub-angular-sub-circular quartz sand chips and a small amount of plagioclase feldspar chips;There are trace amounts of limonite,pyrite,rutile and other minerals in between the quartz sand chips;The mud is mainly composed of sericite;The main source of Al is plagioclase feldspar,sericite;The main source of Ti is rutile;The main source of Fe is various types of iron minerals. ② The 0. 71~ 0. 074 mm grains in the crushed to 2~ 0 mm ore samples (with a yield of 73. 40%) were combined with the mill-qualified grains of 2 ~ 0. 71 mm grains with a yield of 17. 68%,and the iron was removed by using a high-gradient strong magnetic separator (with a background magnetic induction intensity of 1. 7 T). The quartz concentrate with SiO2 of 99. 83%,Fe2O3 of 0. 007 7%,Al 2O3 of 0. 049%,and TiO2 of 0. 002 0% was finally obtained under acid leaching at a sulfuric acid to hydrofluoric acid mass ratio of 2 ∶1,a liquid to solid mass ratio of 1 ∶1,a leaching time of 5. 0 h,and the leaching temperature was 65 ℃ ,which meets the product quality requirements. 

Key words: photovoltaic sand,quartz purification,grinding,high gradient strong magnetic separation,acid leaching