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明矾石[KAl_3(SO_4)_2(OH)_6]是一种有前途的非铝土矿型铝资源,美国估计有800×10~4吨含35％明矾石的储量。与明矾石伴生的主要脉石矿物是石英。已经研究用来处理这种矿石的热化学过程,不能在处理前把脉石初步除去。在这方面,用选矿达到显著的技术和经济利益可能是理想的。实验结果指出油酸浮选法的效率和例证在细粒选矿中碰到的问题。这些结果表明,分选质量与温度、捕收剂用量和抑制剂用量的关系,它取决于磨碎时达到的解离程度。粗磨时,由于连生体存在,分选质量受到限制;而细磨时,解离比较彻底,得到较好的分选。每一粒级的解离度,用扫描式电子显微镜(能量扩散的X射线技术)测定。发现它与磨碎的程度无关,并假定解离度是由于无选择破碎和没有分开的结果。在达到89％—400目的情况下,分选质量看来不仅受到剩余的连生体颗粒限制,而且明矾石还受到细粒石英脉石(—2微米)污染的影响。磨到—400目时,在50℃的条件下,最佳的选别结果是:粗选回收率88％,品位为65％的明矾石。
Alunite [KAl_3 (SO_4) _2 (OH) _6] is a promising non-bauxite resource and the United States has an estimated 800 x 10 ~ 4 tonnes of 35% alunite-containing reserves. The main gangue mineral associated with alunite is quartz. The thermochemical processes used to treat this ore have been studied and the gangue can not be initially removed prior to treatment. In this regard, it may be desirable to achieve significant technical and economic benefits with beneficiation. The experimental results indicate the efficiency of oleic acid flotation and the problems encountered in the fine-grained beneficiation. These results show that the quality of the separation depends on the temperature, the amount of collector used and the amount of inhibitor, which depends on the degree of dissociation achieved at the time of milling. Rough grinding, due to the presence of organisms, sorting quality is limited; and fine grinding, dissociation more thoroughly, get better sorting. The degree of dissociation per particle size was measured with a scanning electron microscope (energy-dispersive X-ray technique). It is found that it has nothing to do with the degree of grater and assumes that the degree of dissociation is due to no choice of crushing and no separate result. At 89% -400 mesh, the sorting quality appears to be affected not only by the remaining mesogenic particles, but also by the contamination of fine-grained quartz gangue (-2 microns). When milled to -400 mesh, the best sorting results at 50 ° C are: aludite with a crude recovery of 88% and a grade of 65%.