某风化白钨细泥高效回收试验研究

发布时间：2018-06-23 18:47

本文选题：风化白钨矿 + 细泥　；参考：《中国矿业大学》2015年硕士论文

【摘要】：我国的白钨矿大多都是细粒嵌布,极易泥化,表面容易被细粒脉石矿物污染而失去原有的可浮性。同时,白钨矿风化后产生大量白钨细泥,进一步增大了选矿难度,致使细粒白钨矿回收非常困难。加强对微细粒白钨矿的综合回收是有效、合理利用白钨矿资源的重要途径。本文以某风化白钨细泥为研究对象,对原矿进行了粒度分析、化学元素分析、化学物相分析以及矿物组成分析。根据原矿性质,进行了单矿物药剂试验,研究了不同捕收剂以及调整剂对矿物可浮性的影响。然后根据单矿物试验的结果对实际矿物进行了浮选研究,确定了最佳的入料细度、药剂制度以及浮选工艺流程。最后进行了强化浮选研究,分别通过强化搅拌、载体浮选和多流态过程强化柱浮选等方式提高细泥的回收率。根据单矿物药剂试验的结果,用实验室浮选机对原矿进行了常规浮选研究,确定了粗选的入料细度为-0.074mm占80%,浮选矿浆浓度为35%,粗选过程中的药剂制度为Na2CO32000g/t、水玻璃2000g/t、硝酸铅1000g/t、捕收剂ZL300g/t。获得钨粗精矿品位为3.85%,回收率为55.08%。通过工艺流程试验,最终选择了“一粗二精三扫”流程,并且在闭路条件下,获得了品位为12.62%,WO3回收率为56.31%的钨精矿。采用强化搅拌调浆,并用实验室旋流-静态微泡浮选柱对白钨细泥进行一次粗选试验,按照浮选机常规浮选的药剂制度,获得的粗精矿品位为5.71%,WO3回收率达到了63.16%。由于精矿产率较低,所以用浮选机精选,最终确定了“浮选机精选+浮选柱一粗一扫”实验室柱机联合流程,分别进行了开路和闭路试验,获得钨精矿的品位为12.38%,WO3回收率为63.95%。相比浮选机“一粗二精三扫”流程,WO3品位基本相当,回收率提高了7.64个百分点。通过筛析对比,浮选柱的浮选尾矿的细粒级(-38μm)中WO3占有率比浮选机低了7.14个百分点,说明浮选柱对于细粒级白钨矿浮选效果更好,浮选柱在浮选细粒级白钨矿上有较大的优势。采用浮选柱系统回收细粒白钨矿资源具有重要意义,实现了风化白钨细泥资源高效回收利用。
[Abstract]:Most of the scheelite ores in China are fine-grained and easily muddy, and the surface is liable to be polluted by fine gangue minerals and lose its original floatability. At the same time, a large amount of fine slime of scheelite is produced after weathering, which further increases the difficulty of ore dressing and makes it very difficult to recover fine wolframite. It is an effective and important way to make rational use of scheelite resources by strengthening the comprehensive recovery of fine Scheelite. In this paper, the particle size analysis, chemical element analysis, chemical phase analysis and mineral composition analysis of a weathered white tungsten slime are carried out. The effects of different collector and adjuster on the floatability of minerals were studied. Then according to the results of the single mineral test, the flotation of real minerals was studied, and the optimum fineness, reagent system and flotation process were determined. Finally, enhanced flotation was carried out to improve the recovery rate of fine mud by means of enhanced stirring, carrier flotation and multi-flow process enhanced column flotation respectively. Based on the results of the single mineral reagent test, the conventional flotation of raw ore was studied with a laboratory flotation machine. The fineness of raw material is -0.074 mm and the concentration of flotation pulp is 35. The reagent system in rough separation is Na _ 2CO _ 3 2000g / t, water glass 2000g / t, lead nitrate 1000g / t, collector ZL 300g / t. The grade of tungsten concentrate is 3.85 and the recovery is 55.08. Through the technological process test, the process of "one coarse, two fine, three sweeping" was selected, and under the closed circuit condition, the tungsten concentrate with a grade of 12.62% was obtained and the recovery rate of WO _ 3 was 56.31%. A coarse separation test of white tungsten fine slime was carried out by means of a laboratory swirl static microbubble flotation column. According to the conventional flotation reagent system of flotation machine, the coarse concentrate grade of 5.71% WO _ 3 was obtained and the recovery rate reached 63.16%. Because of the low yield of concentrate, the combined flow of laboratory column and laboratory column was determined by flotation machine, and the grade of tungsten concentrate was 12.38 wo 3 recovery rate of 63.95. Compared with flotation machine, the grade of WO _ 3 is almost the same, and the recovery rate is increased by 7.64%. By screening and comparing, the WO _ 3 occupation rate of flotation tailings (-38 渭 m) of flotation column is 7.14% lower than that of flotation machine, which indicates that flotation column has better flotation effect on fine grade scheelite, and flotation column has great advantage in flotation fine grade scheelite. It is of great significance to use flotation column system to recover fine wolframite resources and to realize the efficient recovery and utilization of weathered wolframite fine slime resources.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD954

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