微细粒螺旋溜槽在含钒石煤选矿中的分选特性研究  

Separation Characteristics of Vanadium Pre-concentrating from Stone Coal Using Fine Mineral Spiral

作　　者：刘鑫[1,2] 张一敏[1,2,3] 刘涛[1,2] 孙坤[1,2] 汪博[1,2] 许承宝[1,2] 

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]湖北省页岩钒资源高效清洁利用工程技术研究中心,武汉430081 [3]钒资源高效利用湖北省协同创新中心,武汉430081

出　　处：《有色金属（选矿部分）》2017年第3期70-77,共8页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助(51474162);"十二五"国家科技支撑计划项目(2015BAB18B01)

摘　　要：采用微细粒螺旋溜槽分选含钒石煤,研究了分选过程中主要化学组分和粒度的分布特性,并从动力学的角度阐明了获得较好分选指标的原因。研究结果表明,V_2O_5品位的分布范围较宽,介于0.21%~1.19%,溜槽內缘的品位最低为0.21%,中间区域的品位最高为1.19%,中间至外缘区域的品位介于0.97%~1.19%,V_2O_5主要富集在中间至外缘区域;SiO_2、Fe2O3和P2O5则主要富集在內缘至中间区域,可以实现它们与V_2O_5的重选分离;Ca O在槽外缘有微弱的富集趋势,与V_2O_5的富集区域部分重叠。由粒度分布特性可知,精矿的粒度组成较细,-30μm粒级含量占51.3%,而中矿和尾矿的粒度较粗,+74μm粒级含量分别为47.1%和41.7%;给矿各粒级中,粒级越细V_2O_5的回收率越高,其中-30μm粒级V_2O_5的回收率高达94.58%,预示白云母的选择性磨碎有利于V_2O_5的回收。动力学分析表明,缩小距径比(P/D)可以提高颗粒径向分布函数(rj)对密度的敏感度,提高螺旋溜槽的分选效率;P/D的极小值同时受颗粒密度和粒度的影响,即颗粒密度σ越低,P/D的极小值越小,颗粒的粒度越小,P/D的极小值越小。A fine mineral spiral was adopted for pre-concentration of vanadium from stone coat. Distribution characteristics of particle size and main chemical components were studied and the reasons for obtaining the better separation index were clarified from the view of dynamics. The results show that V205 grade has a wide range of 0. 21% ~ 1.19% , the lowest grade of 0.21% in the inner edge of the trough, the highest grade of 1.19% in the middle region, and 0.97% ~ 1.19% in the middle to outer edge region. The distribution characteristics of SiO2, Fe203 and P205 were similar and mainly enriched in the inner to middle region, which make it possible to separate them from V205 content by gravity. The CaO content had a weak enrichment trend at the outer edge of the trough, partially overlapping with the enrichment region of V205. According to the results of particle size distribution, the particle size composition of concentrate was fine and the content of - 30 Ixm of 51.3%, while the size of the middling and tailing were coarse, with ＋74 p,m content of 47.1% and 41.7% , respectively. In each size fraction of the feed, The finer the size fraction, the higher the recovery rate. It could be concluded that the spiral is favorable for the recovery of V205 in finer size fractions, which indicates that the selective grinding of muscovite is beneficial to the recovery of V205. The dynamics analysis shows that the narrowing pitch to diameter ratio （P/D） can increase the sensitivity of the radial distribution function （ rj ） to the density and improve the separation efficiency of the spiral. The minimum value of P/D was influenced by the particle density and particle size, that was, the lower the particle density, the smaller P/D minimum, the smaller the particle size and the smaller the P/D minimum.

关 键 词：含钒石煤 微细粒 螺旋溜槽 分选特性 

分 类 号：TD455[矿业工程—矿山机电]