煤矸石矿物学性质及磁种法磁选除铁钛研究

Properties of Coal Gangue and Magnetic Separation of Iron and Titanium by Magnetic Seed Method

为提高煤系高岭土煤矸石资源利用率,本文以内蒙准格尔黑岱沟地区的煤矸石为研究对象,对其中蕴含的煤系硬质高岭土进行分选除铁、除钛研究。通过采用X-射线衍射(XRD)谱、X射线荧光(XRF)光谱,扫描电镜(SEM)及显微镜测试从化学成分、微观形貌和矿物组成结构方面对煤矸石进行工艺矿物学分析。实验采用不同磁种对含铁、钛的矿物进行高梯度磁选,单因素实验得出以磁铁矿粉为磁种优于人造铁氧体。通过正交实验表明:磁选电流6 A、给矿记时20 s、矿浆浓度45%为较佳实验条件,此时除铁率为35.63%,除钛率为39.29%。最终产品煅烧后白度为80.96%,达到橡塑工业用煅烧高岭土白度要求。

In order to improve the utilization rate of coal measure kaolinite gangue resources, this paper takes coal measure kaolinite in Heidaigou area of Inner Mongolia as the research object, and studies the iron and titanium removal of coal measure hard kaolinite contained in it. The process mineralogy of coal gangue was analyzed by X-ray diffraction(XRD), X-ray fluorescence(XRF), scanning electron microscope(SEM)and microscope test from the aspects of chemical composition, microstructure and mineral composition.Different magnetic species were used to conduct high-gradient magnetic separation of iron-bearing and titanium-bearing minerals, and the single-factor experiment showed that magnetite powder was superior to artificial ferrite. The orthogonal experiment shows that magnetic separation current 6 A, ore timing 20 s and slurry concentration 45% are the best experimental conditions, and the iron removal rate is 35.63% and the titanium removal rate is 39.29%. The whiteness of the final product is 80.96% after calcination, which meets the whiteness requirement of calcined kaolin used in rubber and plastic industry.