白云母超细粉体的制备及助磨机理的研究

发布时间：2018-04-04 22:23

  本文选题：云母　切入点：超细粉　出处：《西安建筑科技大学》2015年硕士论文

【摘要】：云母属于层状铝硅酸盐矿物,因具有良好的绝缘性等物理化学性能而在橡胶等多个领域得到广泛应用。云母属于较难磨矿物之一,目前白云母深加工厂家较少且技术投入不够,云母高端产品对云母粉体的要求较高,难以满足市场对云母高端产品的需求。鉴于此,以河南某地白云母精矿为原料,研究不同因素对云母超细磨的影响,并优化工艺参数,同时对云母超细磨矿进行助磨机理分析,并在此基础上进行工业试验。单因素试验表明,白云母的粒度随磨矿时间的增加而变小,白云母料浆的最佳的磨矿浓度为45%,提高搅拌磨转速和降低料球比均有利于白云母超细磨。白云母超细磨矿中4~5mm、3~4mm和2~3mm的Al2O3瓷球最佳比例为3:5:2。六偏磷酸钠和三乙醇胺均有助磨效果,其最佳用量分别为1‰和0.2‰。正交试验表明,助磨时间与搅拌速率对白云母超细磨粒度和比表面积为显著影响因素。其最佳参数为:助磨时间为75min,搅拌速率为600r/min,4~5mm、3~4mm和2~3mm的Al2O3瓷球比例为3:5:2,助磨剂六偏磷酸钠用量为0.02%,此时白云母超细磨产品的-13μm粒级含量达到82.60%。在此基础上进行工业白云母超细磨试验,结果表明当给矿量为0.39t/h,Al2O3瓷球的质量9.25t,给矿浓度48.5%~49.5%,六偏磷酸钠用量为2.5‰,搅拌转速为161r/min,2~2.5mm、2.5~3mm和3~3.5mm的Al2O3瓷球比例为4:2:3时,-13μm含量为58.01%。采用旋流器对超细磨产品进行分级,起到较好的分级效果,并推荐了白云母超细粉工业制备流程。本文利用SEM、XRD等方法对白云母超细磨矿过程及六偏磷酸钠和三乙醇胺的助磨机理进行研究。结果表明:白云母超细磨过程中前期晶体沿晶面解离为主,磨矿2.5h后以穿晶断裂为主,晶格的有序结构逐渐瓦解,出现粉化现象。六偏磷酸钠做助磨剂时,磷酸根离子吸附于白云母颗粒表面,降低晶体的表面能,使晶格的结晶度下降,同时降低云母料浆的粘度,提高分散性,从而起到助磨作用。而三乙醇胺通过分子上的-NH2和-OH在云母表面吸附,使晶体面间距增大,表面键能降低,晶格应变增加,进而在晶粒内部产生应力缺陷或晶格缺陷,使白云母颗粒易于破碎,同时三乙醇胺可中和新裂开的晶面的价键,提高了云母粉体的分散性,进而提高磨矿效率。
[Abstract]:Mica, a layered aluminosilicate mineral, has been widely used in many fields such as rubber because of its good physical and chemical properties such as insulation.Mica is one of the difficult grinding materials. At present, there are fewer Muscovite deep processing factories and insufficient technical input, and the requirement of mica powder is higher for the high-end mica products, so it is difficult to meet the demand of the market for the high-end mica products.In view of this, the influence of different factors on ultrafine mica grinding was studied by using Muscovite concentrate in Henan province as raw material, and the technological parameters were optimized. At the same time, the grinding mechanism of mica ultrafine grinding was analyzed, and the industrial test was carried out.The single factor test shows that the particle size of Muscovite decreases with the increase of grinding time. The optimum grinding concentration of Muscovite slurry is 45. Increasing the speed of stirring mill and reducing the ratio of material to ball are all favorable to ultrafine grinding of Muscovite.The optimum ratio of 4 ~ 5 mm ~ 3 ~ 4 mm to 2~3mm for Al2O3 ceramic balls in ultrafine grinding of Muscovite is 3: 5: 2.Both sodium hexametaphosphate and triethanolamine were helpful for grinding, and the optimum dosage was 1 鈥，

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