湖北某石英矿提纯试验研究

Study on Purifying of Quartz Sand in Hubei

湖北某地发现大量SiO2含量为98.86%的石英矿,为得到优质的石英产品,进行了选矿提纯试验。首先将试样筛分为+0.6 mm、0.1～0.6 mm、-0.1 mm 3个粒级。-0.1 mm粒级作为尾矿直接抛弃;0.1～0.6 mm粒级采用磁选—浮选—酸浸工艺流程进行试验,首先经高梯度强磁选除铁,非磁性产品以草酸为抑制剂、十二胺为捕收剂,经1粗1精反浮选去除云母,浮选精矿以盐酸和硫酸的混合酸为浸出剂,在酸浸温度为60℃、酸浸时间为6 h条件下酸浸提纯后,获得SiO2含量为99.79%、杂质Fe2O3含量为73.70×10-6、白度为90.93%的石英砂,既可以作为光伏玻璃石英砂,也可以作为石英板材;+0.6 mm粒级酸浸后再经色选,可以得到SiO2含量为99.85%、杂质Fe2O3含量为62.65×10-6的石英砂,达到石英板材质量要求。

A large number of quartzite ore with 98.86% SiO2 have been discovered in Hubei. In order to obtain highquality quartz products,beneficiation purification experiment was conducted. Firstly,the samples were screened into three sizes of +0.6 mm,0.1~0.6 mm and-0.1 mm.-0.1 mm particle size product was discarded as tailings directly. Magnetic separation-flotation-acid leaching process was conducted on 0.1~0.6 mm particle size. Firstly,iron in ore is removed by high gradient high intensity magnetic separation. Mica in non-magnetic products are removed by one roughing one cleaning reverse flotation with oxalic acid as inhibitor and dodecyl amine as collector. Finally,quartz sand with 99.79% SiO2,73.70×10-6 impurity Fe2 O3 and 90.93% whiteness can be obtained from flotation concentrate by acid leaching with mixed acid of hydrochloric acid and sulphuric acid as leaching agent and acid leaching at 60 ℃ for 6 h,which can be used not only as photovoltaic glass quartz sand,but also as quartz plate. Quartz sand with 99.85% SiO2 and 62.65×10-6 impurity Fe2 O3 can be obtained by acid leaching with +0.6 mm particle size and color separation,which meets the quality requirements of quartz plate.