GYX高频振动细筛在河南某铁矿选厂的应用

Application of GYX High Frequency Vibrating Fine Screen in an Iron Dressing Plant from Henan Province

河南某铁矿矿石中主要铁矿物为镜铁矿和磁铁矿,主要脉石矿物为石英和云母。该矿选矿厂原采用阶段磨矿、阶段选别的弱磁选—高梯度强磁选工艺产出磁铁矿精矿和镜铁矿精矿,但由于难磨且具弱磁性的粗粒含铁云母大量混入镜铁矿精矿,致使镜铁矿精矿的品位低于60%且难以提高,并影响综合精矿品位。为解决这一问题,选矿厂联合广州有色金属研究院开展了相关实验室试验,并根据实验室试验结果,引入GYX21-1210型高频振动细筛和普通型6-S细砂摇床对原选矿工艺流程进行了技术改造,即将原二段高梯度强磁选精矿用细筛按0.074 mm进行筛分,筛下直接作为一部分镜铁矿精矿,筛上经摇床1次选别获得其余镜铁矿精矿,同时抛弃大量尾矿,摇床中矿则返回二段磨矿作业。改造后,镜铁矿精矿和综合铁精矿的铁品位分别达到了60.30%和61.83%,与原流程相比分别提高了3.55和1.98个百分点,同时还使镜铁矿精矿和综合铁精矿的铁回收率分别提高了7.52和7.51个百分点。

Main iron minerals of an iron ore from Henan Province in China are specularite and magnetite,and the main gauges are quartz and mica. The dressing plant originally adopted the process of low intensity magnetic separation with stage grinding and stage separation,high gradient high intensity magnetic separation to produce the magnetite concentrate and speculartie concentrate. However,it is hard to realize grinding for the run-of-mine,and weak magnetic coarse iron-bearing mica are usually mixed into speculartie concentrate,resulting in specularite concentrate grade lower than 60%,and even greatly affecting the comprehensive grade of the concentrate. To solve this problem,the plant joints with the Guangzhou Nonferrous Metal Research Institute to carry out the relevant laboratory tests. Based on the laboratory test results,the GYX21-1210 type high-frequency vibrating fine sieve and the ordinary 6-S type fine shaking table are introduced to optimize the original beneficiation process. That is,the high gradient high intensity magnetic concentrate at two-stage are sieved by 0. 074 mm fine screen. The under-screen is directly used as the specularite concentrate,and the over-size ores are separated by the table to obtain the remained specularite concentrate and discard a great deal of tailings. The middles from the table are back to the second stage process. After optimization,the specularite concentrate and the integrated iron grade reached 60. 30% and 61. 83%,improved by 3. 55 percentage points and 1. 98 percentage points respectively. Meanwhile,their iron recoveries were increased by 7. 52 percentage points and 7. 51 percentage points separately.