本文選題：云母　切入點(diǎn)：超細(xì)粉　出處：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：云母屬于層狀鋁硅酸鹽礦物,因具有良好的絕緣性等物理化學(xué)性能而在橡膠等多個(gè)領(lǐng)域得到廣泛應(yīng)用。云母屬于較難磨礦物之一,目前白云母深加工廠家較少且技術(shù)投入不夠,云母高端產(chǎn)品對云母粉體的要求較高,難以滿足市場對云母高端產(chǎn)品的需求。鑒于此,以河南某地白云母精礦為原料,研究不同因素對云母超細(xì)磨的影響,并優(yōu)化工藝參數(shù),同時(shí)對云母超細(xì)磨礦進(jìn)行助磨機(jī)理分析,并在此基礎(chǔ)上進(jìn)行工業(yè)試驗(yàn)。單因素試驗(yàn)表明,白云母的粒度隨磨礦時(shí)間的增加而變小,白云母料漿的最佳的磨礦濃度為45%,提高攪拌磨轉(zhuǎn)速和降低料球比均有利于白云母超細(xì)磨。白云母超細(xì)磨礦中4~5mm、3~4mm和2~3mm的Al2O3瓷球最佳比例為3:5:2。六偏磷酸鈉和三乙醇胺均有助磨效果,其最佳用量分別為1‰和0.2‰。正交試驗(yàn)表明,助磨時(shí)間與攪拌速率對白云母超細(xì)磨粒度和比表面積為顯著影響因素。其最佳參數(shù)為:助磨時(shí)間為75min,攪拌速率為600r/min,4~5mm、3~4mm和2~3mm的Al2O3瓷球比例為3:5:2,助磨劑六偏磷酸鈉用量為0.02%,此時(shí)白云母超細(xì)磨產(chǎn)品的-13μm粒級含量達(dá)到82.60%。在此基礎(chǔ)上進(jìn)行工業(yè)白云母超細(xì)磨試驗(yàn),結(jié)果表明當(dāng)給礦量為0.39t/h,Al2O3瓷球的質(zhì)量9.25t,給礦濃度48.5%~49.5%,六偏磷酸鈉用量為2.5‰,攪拌轉(zhuǎn)速為161r/min,2~2.5mm、2.5~3mm和3~3.5mm的Al2O3瓷球比例為4:2:3時(shí),-13μm含量為58.01%。采用旋流器對超細(xì)磨產(chǎn)品進(jìn)行分級,起到較好的分級效果,并推薦了白云母超細(xì)粉工業(yè)制備流程。本文利用SEM、XRD等方法對白云母超細(xì)磨礦過程及六偏磷酸鈉和三乙醇胺的助磨機(jī)理進(jìn)行研究。結(jié)果表明:白云母超細(xì)磨過程中前期晶體沿晶面解離為主,磨礦2.5h后以穿晶斷裂為主,晶格的有序結(jié)構(gòu)逐漸瓦解,出現(xiàn)粉化現(xiàn)象。六偏磷酸鈉做助磨劑時(shí),磷酸根離子吸附于白云母顆粒表面,降低晶體的表面能,使晶格的結(jié)晶度下降,同時(shí)降低云母料漿的粘度,提高分散性,從而起到助磨作用。而三乙醇胺通過分子上的-NH2和-OH在云母表面吸附,使晶體面間距增大,表面鍵能降低,晶格應(yīng)變增加,進(jìn)而在晶粒內(nèi)部產(chǎn)生應(yīng)力缺陷或晶格缺陷,使白云母顆粒易于破碎,同時(shí)三乙醇胺可中和新裂開的晶面的價(jià)鍵,提高了云母粉體的分散性,進(jìn)而提高磨礦效率。
[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，

本文編號：1711966