微细粒螺旋溜槽在含钒石煤选矿中的分选特性研究

发布时间：2018-04-18 23:32

本文选题：含钒石煤 + 微细粒　；参考：《有色金属(选矿部分)》2017年03期

【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Qg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Qg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。
[Abstract]:The distribution characteristics of main chemical components and granularity in the separation process of vanadium bearing stone coal were studied by means of fine grain spiral chute, and the reasons for obtaining better separation index were explained from the point of view of kinetics.The results show that the distribution range of V _ 2O _ 5 grade is relatively wide.Between 0.21 and 1.19, the grade at the edge of the chute is 0.21, the grade in the middle area is 1.19, and the grade between the middle and the outer edge is between 0.97 and 1.19. The grade of V _ 2O _ 5 is mainly enriched in the middle to outer edge areas, and in the middle to the outer edge, the content of Fe _ 2O _ 3 and P2O5 are mainly concentrated in the QG to the middle regions.It can be realized that there is a weak enrichment trend between them and the gravity separation of V_2O_5 in the outer edge of the trough, which overlaps with the enrichment area of V_2O_5.According to the particle size distribution characteristics, the granularity composition of concentrate is finer than 30 渭 m, while that of middle ore and tailings is coarser, the content of 74 渭 m is 47.1% and 41.7%, respectively, and the recovery rate of V_2O_5 is higher with the finer the grain size of the ore.The recovery rate of -30 渭 m V_2O_5 was 94.58, indicating that selective grinding of Muscovite was beneficial to the recovery of V_2O_5.Kinetic analysis shows that reducing the ratio of distance to diameter (P / D) can improve the sensitivity of particle radial distribution function (RJ) to density, and increase the separation efficiency of spiral chute and the minimum value of P / D is affected by particle density and particle size at the same time.That is, the lower the particle density 蟽 is, the smaller the minimum value of P / D is, and the smaller the particle size is, the smaller the minimum value of P / D is.
【作者单位】：武汉科技大学资源与环境工程学院;湖北省页岩钒资源高效清洁利用工程技术研究中心;钒资源高效利用湖北省协同创新中心;
【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)
【分类号】：TD455.3;TD954

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