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磁化焙烧—磁选工艺是有效处理难选弱磁性氧化铁矿的最有效方法之一,所得到的铁精矿性质与天然磁铁矿性质具有较大的差别。反浮选结果表明,人工磁铁矿和天然磁铁矿在浮选性能方面具有较大的差异,采用XRD(X-ray diffraction)、显微镜测试技术观察磁化焙烧矿物组成和物相变化,原矿中硅以碎屑石英和硅质泥岩形式存在,焙烧后有部分硅质泥岩,还有部分石英是被铁矿包裹,分布较原矿分散,即磁化焙烧形成的磁铁矿有一定的包裹、充填和浸染现象,具有不完整的晶体结构,分布分散,矿石内部组织结构的不均匀程度增加。原矿有用矿物主要以Fe2O3形式存在,脉石矿物主要是石英;焙烧后铁矿物的赋存由Fe2O3转变成Fe3O4为主,并掺杂Fe2O3,FeO,Fe,矿物组成发生变化,矿物不均匀性增强。焙烧物中还出现高铁橄榄石和铁硅酸盐峰,一部分橄榄石和硅酸盐矿物进入反浮选精矿,造成铁损失。
Magnetization roasting-magnetic separation is one of the most effective methods to effectively treat refractory weak magnetic iron oxide. The properties of obtained iron concentrate are quite different from those of natural magnetite. The results of reverse flotation showed that the magnetite and natural magnetite have great differences in flotation performance. XRD (X-ray diffraction) and microscopic test were used to observe the composition and phase change of magnetized roasting minerals. Silicon is in the form of clastic quartz and siliceous mudstone. Some of the siliceous mudstone is roasted and some of the quartz is surrounded by iron ore and distributed more than the ore. That is, the magnetite formed by magnetization roasting has a certain degree of packing and filling Impregnation phenomenon, with incomplete crystal structure, distribution and dispersion, ore internal structure of the uneven increase in the degree. The minerals of the ore are mainly Fe2O3 and the gangue minerals are mainly quartz. The occurrence of the iron minerals after roasting changes from Fe2O3 to Fe3O4, and is doped with Fe2O3, FeO, Fe. The mineral composition changes and the mineral heterogeneity Enhanced. High-frequency fayalites and ferrosilicates also appear in the calcinations. A portion of the olivine and silicate minerals enter the anti-flotation concentrate, resulting in loss of iron.