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一个贱金属矿山正计划大范围的改造它的选矿厂，计划用自磨机扩大现有的破粉／磨矿回路，并用柱槽代替常规的浮选槽。在AARL（南非英美研究实验有限公司）半工业试验装置进行了矿石试验，并提供了经得起检验的全自磨单段磨矿。用该矿山球磨机磨碎的物料，用半工业试验柱已经获得成功。实验室棒磨磨碎的物料也显示出好的浮选效果，但是用全自磨（FAG）和半自磨（SAG）磨碎的物料却得到较差的浮选结果。通过粒级分析研究指出，引起的原因是由于与棒磨相比在FAG／SAG产品中含有较多量的超细硫化物和滑石。粗选机／扫选机停留时间必须至少延长60％以改善FAG物料的浮选速率。对于粒度为80％－74μm的FAG物料，早期柱浮选时得不到满意的回收率和品位，柱糟的操作参数被控制到与常规的半工业浮选装置试验类似的浮选结果。主要的参数变量是给料稀释水、冲洗水和气体与固体比。
A base metal mines is planning a wide range of transformation of its concentrator, plans to use the mill to expand the existing pulverizer / grinding circuit, and replace the conventional flotation tank with a column. The ore test was conducted at the AARL semi-industrial pilot plant and provides a fully self-grinding single-stage mill that is well-tested. Materials milled with the mine ball mill have been successfully used in semi-industrial test columns. Laboratory rod mill ground material also showed good flotation results, but materials fined with FAG and SAG gave poorer flotation results. The particle size analysis indicates that the reason for this is due to the higher amount of ultrafine sulfides and talc contained in the FAG / SAG product compared to the rod mill. Coarse / sorter dwell time must be extended by at least 60% to improve FAG material flotation rate. For FAG materials with a particle size of 80% -74 μm, satisfactory recovery and grade were not obtained in early stage column flotation, and the operating parameters of the column were controlled to similar flotation results as in the conventional semi-industrial flotation unit test. The main parameter variables are feed dilution water, flush water and gas to solids ratio.