Fe extraction from high-silicon and aluminum cyanide tailings by pretreatment of water leaching before magnetic separation

从高硅高铝氰化物渣中水浸预处理-磁选提铁(英文)

Pretreatment of high content of Si- and Al-containing cyanide tailings by water leaching to remove some impurities, such as the major impurities minerals of Si and A1, as well as its effect on Fe extraction in the water leaching process was investigated. The effects of different parameters on iron recovery were studied, and the reaction parameters were proposed as follows： sodium carbonate content of 30%, water leaching at 60 ~C for 5 min, liquid/solid ratio of 15：1, and exciting current of 2 A. Under these optimal conditions, magnetic concentrate containing 59.11% total iron and a total iron recovery rate of 76.12% was obtained. In addition, the microstructure and phase transformation of the process of water leaching were studied by X-ray powder diffraction technique （XRD）, Electronic image of backscattering （BEI）, X-ray fluorescence （XRF）, and energy dispersive spectrometry （EDS）. The results indicate that the soluble compound impurities generated in the roasting process are washed out, and the dissoluble substances enter into nonmagnetic materials by water leaching, realizing the effective separation of impurities and Fe.

焙烧、水浸等预处理可以去除高硅、高铝氰化渣中的杂质,如硅和铝。研究了硅和铝在水浸过程中对提取铁的影响。通过化学成分分析和物相分析,对比直接还原焙烧磁分离方法和还原焙烧酸浸出磁分离方法。结果表明,水浸后磁选精矿铁的品位和铁回收率分别为10%和15%。还原焙烧-水浸-磁选方法更适合氰化渣中铁的提取。研究了反应条件对铁回收率的影响,确定最佳反应条件为:温度60℃、时间5 min、液固比15:1、搅拌速度20 r/min、磁选电流2 A。在最佳条件下,磁铁精矿中铁品位为56.82%,回收率为79.39%。此外,通过XRD、BEI、XRF、EDS等方法研究了水浸出过程中氰化渣的微观结构和相变过程。结果表明,在焙烧过程中生成的可溶性化合物杂质在水浸过程被洗掉,可溶解的物质通过水浸出而进入非磁性物质,从而实现了杂质和铁的有效分离。