基于磁选预富集的湖北枣阳金红石矿石选矿试验

为高效率、低成本、小污染、高效益地开发利用湖北枣阳金红石矿石资源，根据主要脉石矿物有弱磁性，而金红石无磁性的特点，以高梯度中强磁选预富集工艺为基础进行了金红石选矿试验。结果表明：①在磨矿细度为-0.074 mm占88.60%的情况下，1粗1扫高梯度中强磁选抛尾产率可达29.16%，中强磁选精矿金红石含量为3.07%、回收率为89.50%；②高梯度中强磁选精矿经1粗3精3扫闭路浮选，可获得金红石含量64.53%、回收率为82.21%的金红石浮选精矿；③金红石浮选精矿采用高梯度强磁选-焙烧-酸浸工艺提纯，高梯度强磁选背景磁感应强度为1.2 T，焙烧温度为900 ℃、时间为45 min，盐酸浸出的酸浓度为10%、液固比为1∶5、温度为80 ℃、时间为30 min，最终获得金红石含量为87.88%、回收率为71.21%、TiO2品位为90.12%的金红石精矿。与传统的重选预富集工艺相比，采用磁选工艺可减少细粒金红石损失，提高金红石回收率，为国内金红石资源的高效开发利用提供了一种新思路。

Rutile Ore Pre-concentration Tests Based on Magnetic Processing in Zaoyang,Hubei

In order to exploit and utilize rutile ore resources in Zaoyang Hubei in an efficient，low cost，little contamination and more economical way，rutile beneficiation experiment was conducted by high gradient medium-high intensity magnetic processing based on low intension magnetism in main gangues，while rutile has no magnetism.The results showed that:①tailings discarding yield rate can reach 29.16% using the process of one roughing，one scavenging high gradient medium-high intensity magnetic separation at grinding fineness of 88.60% passing 0.074 mm，medium-high intensity magnetic concentrate with rutile content of 3.07% and recovery of 89.50% was obtained.②after medium-high intensity magnetic concentrate was treated by the closed circuit flotation of one roughing three cleaning three scavenging，rutile flotation concentrate was obtained with rutile content of 64.53% and recovery of 82.21%.③treating the rutile flotation concentrate via high gradient high intensity magnetic separation-roasting-hydrochloric acid leaching process to refine flotation concentrates，final rutile concentrates contained 87.88% rutile with rutile recovery of 71.21%，and the grade of TiO2 90.12% was obtained at the conditions of background field intensity for high gradient high intensity magnetic separation of 1.2 T，roasting temperature 900 ℃ for 45 min，and then hydrochloric acid was chosen to leach，the solids of acid was 10%，ratio between liquid and solids was 1 to 5，leaching time was 30 min with temperature at 80 ℃.Compared with traditional gravity concentration as pre-concentration processing，magnetic processing to pre-concentrate rutile can reduce fine rutile particles loss，improve its recovery，which provides a new idea of processing rutile resource effectively at domestic.