Abstract

To effectively separate the valuable minerals in ludwigite, this study investigated the mineralogy of ore, particle-size distribution and mineral liberation characteristics. Most of the magnetite was intergrown with ascharite and serpentine. Nearly half of the serpentine existed in a dense, massive body. Most of the ascharite was encased in magnetite, and a small amount was embedded in the serpentine phase. After the microwave radiation, some intergranular and through cracks were formed to improve mineral liberation during the grinding process. The mass fractions for the +75 μm range decreased from 43.16 wt% for untreated samples to 24.31 wt% for treated samples with a microwave power of 3 kW for 40 s. By contrast, the mass fractions of particles in the −75 μm range increased from 56.84 wt% for untreated samples to 75.69 wt% for treated samples. D₅₀ decreased from 53.54 µm for the untreated sample to 21.58 µm for the treated sample. The liberation degrees after the treated samples clearly improved and increased by 26.64% for magnetite, 18.92% for ascharite and 14.10% for serpentine.

摘要

为有效分离硅铁矿中的有价矿物，本研究对矿石的矿物学、粒度分布和矿物释放特征进行了研究。大部分磁铁矿与石蜡石和蛇纹石共生。将近一半的蛇形石存在于一个致密、巨大的身体中。大部分的石蜡石包裹在磁铁矿中，少量嵌入蛇纹石相中。微波辐射后，在研磨过程中形成了一些晶间和贯穿裂纹，以改善矿物的释放。+75 μm 范围的质量分数从未处理样品的 43.16 wt% 下降到微波功率为 3 kW 持续 40 s 的处理样品的 24.31 wt%。相比之下，-75 μm 范围内的颗粒质量分数从未处理样品的 56.84 wt% 增加到处理样品的 75.69 wt%。D ₅₀从未处理样品的 53.54 µm 降低到处理样品的 21.58 µm。处理后样品的游离度明显提高，磁铁矿提高了26.64%，石蜡矿提高了18.92%，蛇纹石提高了14.10%。