Abstract The formation of slime particles in processes of minerals grinding limits froth flotation. Minera de Orgiva S.L. (Spain) produces slime sludge containing 41.05% of CaF2 from a fluorite ore. Slimes have a very small particle diameter with very high specific surface area making this material difficult to process by froth flotation even when the grade of the material is high. Furthermore, removing this fraction of the mineral from the flotation process generates a waste that causes the appearance of slagheap that affects negatively the environment. This work studies the influence of aeration flow rate, time of flotation, agitator speed and pH in the flotation process of fluorite slimes. Results were adjusted to a polynomial mathematical model. An optimum 76.21% of fluorite grade was achieved with a metallurgical recovery of 70.57% using values of 0.8 m3/h of air flow rate, 7 min of flotation time, 1100 rpm and pH of 9.25.

中文翻译：

---

理化参数对超细萤石泡沫浮选的影响

摘要 矿物研磨过程中煤泥颗粒的形成限制了泡沫浮选。Minera de Orgiva SL（西班牙）从萤石矿石中生产含有 41.05% CaF2 的煤泥。煤泥具有非常小的颗粒直径和非常高的比表面积，使得这种材料即使在材料等级很高时也难以通过泡沫浮选进行加工。此外，从浮选过程中去除这部分矿物会产生废物，导致出现对环境产生负面影响的渣堆。研究了曝气流量、浮选时间、搅拌速度和pH值对萤石泥浮选过程的影响。结果被调整为多项式数学模型。最佳萤石品位为 76.21%，冶金回收率为 70。