本文選題：煤基炭素 + 超細粉碎�。� 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：煤基炭素主要以優(yōu)質(zhì)無煙煤作為原料,經(jīng)過無煙煤的超純制備,低溫炭化處理以及超細粉碎,最終獲得滿足技術(shù)要求的產(chǎn)品。而煤基炭素的超細粉碎作為整個生產(chǎn)流程的最后一環(huán)對最終產(chǎn)品的性能有著重要的意義,本文主要研究煤基炭素的結(jié)構(gòu)性質(zhì)、超細粉碎工藝參數(shù)以及干法助磨等問題。采用激光粒度儀、掃描電鏡以及透射電鏡等先進儀器設(shè)備對煤基低溫炭化材料進行物理化學(xué)性質(zhì)表征。主要開展了粒度分析、顆粒形貌結(jié)構(gòu)觀測、表面元素官能團分析以及石墨化程度分析,發(fā)現(xiàn)其中位徑D50為5.14μm,顆粒形狀以不規(guī)則多角形狀為主,化學(xué)結(jié)構(gòu)以芳香族C-C結(jié)構(gòu)為主,主體結(jié)構(gòu)周圍含有酚羥基C-OH、羰基C=O以及羧基COOH等官能團,碳結(jié)構(gòu)以無序的無定形碳為主并含有少量石墨微晶。在干法粉碎條件下,研究了行星球磨機的主要工藝參數(shù)對煤基炭素超細粉碎的影響規(guī)律及作用機理。超細粉碎的試驗研究表明:(1)在一定的粉碎時間內(nèi),粉體的D50隨著粉碎時間的延長不斷降低,而粉碎時間超過30min以后粉體顆粒會出現(xiàn)團聚現(xiàn)象,不利于顆粒的粉碎;(2)粉碎介質(zhì)的直徑越小,其比表面積越大,與粉體顆粒的接觸效率越高,對煤基炭素的粉碎效果越好;當(dāng)采用5mm直徑的粉碎介質(zhì)時,粉體的D50達到最小值3.11μm;(3)隨著磨機轉(zhuǎn)速的增大,粉碎介質(zhì)對粉體施加的粉碎力越強,但粉體的D50的減小程度并不明顯;(4)隨著球料比的不斷升高,粉體的D50顯著減小,當(dāng)球料比為50:1時,粉體的D50達到2.45μm;(5)在粉體質(zhì)量一定的條件下,粉碎介質(zhì)的填充率與粉體的D50并沒有很好的相關(guān)性。因此,在煤基炭素的超細粉碎中,粉碎時間、粉碎介質(zhì)的直徑以及球料比是能夠促進粉體顆粒粒度的不斷降低的重要因素。綜合以上分析,煤基炭素超細粉碎的合理工藝參數(shù):超細粉碎不銹鋼球的直徑為3mm,超細粉碎時間為30min,行星球磨機自轉(zhuǎn)轉(zhuǎn)速260r/min,球料比20:1,不銹鋼球體積填充率為10.25%。在助磨劑的“強度削弱理論”和煤基炭素表面性質(zhì)分析的基礎(chǔ)上,表面改性劑能夠改變煤基炭素顆粒的表面性質(zhì)以阻止顆粒的團聚和改善粉體的流動性,而高硬度助磨劑能夠降低煤基炭素顆粒的強度。超細助磨的試驗研究表明:(1)在助磨劑種類的試驗中,表面改性劑對粉體的改性作用不能有效促進煤基炭素的超細粉碎,而高硬度助磨劑能夠有效降低煤基炭素顆粒的強度,實現(xiàn)顆粒粒度的進一步降低;(2)在助磨劑用量的試驗中,助磨劑石英砂的添加量為1.4g時,粉體的中位徑達到最小值;(3)助磨劑石英砂的三種添加方式:粉碎前的一次性添加、粉碎過程中每隔10min添加相同質(zhì)量的石英砂、粉碎過程中每隔10min添加不同質(zhì)量的石英砂,其中石英砂粉碎前的一次性添加對煤基炭素的助磨效果更好。
[Abstract]:Coal based carbon is mainly made of high quality anthracite as raw material, through the preparation of anthracite, low temperature carbonization and ultrafine pulverization, finally the products which meet the technical requirements are obtained. The ultrafine pulverization of coal based carbon is of great significance to the performance of the final product as the last link in the whole production process. This paper mainly studies the structural properties of coal based carbon, the technological parameters of ultrafine pulverization and dry grinding. The physical and chemical properties of coal based low temperature carbonization materials were characterized by laser particle size analyzer, scanning electron microscope and transmission electron microscope. The particle size analysis, particle morphology observation, surface element functional group analysis and graphitization degree analysis were carried out. It was found that the potential diameter D50 was 5.14 渭 m, the particle shape was irregular polygonal shape, and the chemical structure was aromatic C-C structure. The main structure contains functional groups such as phenolic hydroxyl C-OH, carbonyl Con O and carboxyl COOH. The carbon structure is mainly disordered amorphous carbon with a small amount of graphite microcrystals. Under the condition of dry grinding, the influence of the main technological parameters of planetary ball mill on coal based carbon ultrafine grinding and its action mechanism were studied. The experimental results of ultrafine grinding show that the D50 of the powder decreases with the prolongation of the grinding time, and the agglomeration of powder particles will occur when the crushing time exceeds 30min. The smaller the diameter of pulverizing medium is, the larger the specific surface area is, the higher the contact efficiency with powder particles is, the better the comminuting effect of coal based carbon is, when the pulverized medium with 5mm diameter is used, The D50 of powder reaches the minimum value of 3.11 渭 m ~ (3) with the increase of grinding speed, the comminuting force is stronger, but the decrease of D50 of powder is not obvious.) with the increasing of the ratio of ball to material, the D50 of powder decreases significantly. When the ratio of ball to material is 50:1, the D50 of the powder reaches 2.45 渭 m ~ (5) under the condition of certain powder quality, the filling ratio of the comminuted medium has no good correlation with the D50 of the powder. Therefore, in the ultrafine pulverization of coal based carbon, the grinding time, the diameter of comminuted medium and the ratio of ball to material are the important factors to promote the decreasing of particle size. According to the above analysis, the reasonable technological parameters of coal based carbon ultrafine grinding are as follows: the diameter of ultrafine pulverized stainless steel ball is 3 mm, the crushing time is 30 minutes, the rotation speed of planetary ball mill is 260 r / min, the ratio of ball to material is 20: 1, and the volume filling ratio of stainless steel ball is 10.25. Based on the "strength weakening theory" of grinding aids and the analysis of the surface properties of coal based carbon, the surface modifiers can change the surface properties of coal based carbon particles to prevent the agglomeration of coal particles and improve the fluidity of powders. High hardness grinding aids can reduce the strength of coal-based carbon particles. The experimental study of ultra-fine grinding shows that the surface modifier can not effectively promote the ultrafine pulverization of coal based carbon, while the high hardness grinding aid can effectively reduce the strength of coal based carbon particles in the experiment of the type of grinding aids, and the surface modifier can not effectively promote the ultrafine pulverization of coal based carbon, while the high hardness grinding aid can effectively reduce the strength of coal based carbon particles. In the experiment of grinding aid dosage, when the addition amount of grinding aid quartz sand is 1.4 g, the medium diameter of powder reaches the minimum value of 3) three kinds of adding ways of grinding aid quartz sand are as follows: one time addition before comminution, Quartz sand of the same quality was added at intervals of 10min during crushing and quartz sand of different quality was added at every interval of 10min during the grinding process.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ127.11

【參考文獻】

相關(guān)期刊論文 前10條

1 魏緒玲;付含琦;鄭聚成;龔光碧;劉燕萍;梁滔;;橡膠補強填料的研究進展[J];高分子通報;2014年02期

2 楊艷利;華賁;徐文東;熊永強;;低溫粉碎橡膠技術(shù)在我國的發(fā)展前景[J];化工進展;2006年06期

3 王夏冰;磨球直徑和添加劑對行星球磨行為的影響[J];機床與液壓;2002年06期

4 段希祥;球徑半理論公式的修正研究[J];中國科學(xué)E輯:技術(shù)科學(xué);1997年06期

5 魏新超,陳炳辰;球磨機細磨特性的研究[J];硫磷設(shè)計與粉體工程;2000年06期

6 李艷軍;李運恒;王亞琴;劉杰;劉雁翎;;超細攪拌磨在選礦中的應(yīng)用[J];現(xiàn)代礦業(yè);2014年07期

7 ;XPS analysis and combustibility of residues from two coals extraction with sub-and supercritical water[J];燃料化學(xué)學(xué)報;2009年04期

8 王茂章,楊全紅,成會明;碳的結(jié)構(gòu)及其同素異性體[J];炭素技術(shù);2001年01期

9 韓躍新,田，

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