本文關(guān)鍵詞：碳化精制工藝對白泥碳酸鈣品質(zhì)的影響研究　出處：《陜西科技大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 白泥碳酸鈣 填料 AKD施膠 碳化精制 聚乙二醇 聚丙烯酸鈉

【摘要】：白泥碳酸鈣是造紙行業(yè)中堿回收工段的固體廢棄物,它能夠替代輕質(zhì)碳酸鈣(PCC)作為紙張?zhí)盍?其經(jīng)濟與環(huán)境效益明顯。然而,白泥碳酸鈣精制為紙張?zhí)盍系倪^程中發(fā)現(xiàn),利用二氧化碳(CO_2)碳化精制得到的白泥碳酸鈣填料加填后,加填紙的AKD施膠效率顯著降低,限制了白泥碳酸鈣作為造紙?zhí)盍系拇笠?guī)模應用。因此,為了提高碳化精制后白泥碳酸鈣的品質(zhì)及應用性能,本課題針對碳化精制工藝對白泥碳酸鈣品質(zhì)及其加填紙施膠性能的影響機理進行研究,在此基礎(chǔ)上,研究添加劑調(diào)控碳化精制工藝實現(xiàn)對白泥碳酸鈣品質(zhì)的改善,以期為提高堿回收白泥碳酸鈣的品質(zhì)控制提供依據(jù),促進其資源化利用技術(shù)發(fā)展。本論文的主要研究成果如下:研究碳化程度對施膠性能的影響,結(jié)果表明:碳化程度越高,制備的白泥碳酸鈣細小粒子的含量越多,相應的白泥碳酸鈣加填紙的AKD施膠性能越差;細小粒子含量是影響碳化白泥碳酸鈣加填紙施膠性能的重要因素之一。研究并闡明碳化白泥碳酸鈣對加填紙AKD施膠性能的影響及其作用機理,結(jié)果表明:盡管白泥碳酸鈣細小粒子在抄紙過程中低留著特性會導致部分被其吸附的AKD無效流失,但采用強化碳化白泥碳酸鈣細小粒子組分的留著,并未提高加填紙的施膠性能。因此,細小粒子低留著導致的AKD流失并不是導致碳化白泥碳酸鈣加填紙施膠性能差的主要原因。主要原因是由于細小粒子表面形貌不規(guī)則,碳化白泥碳酸鈣具有大的比表面積、孔體積及孔徑,更容易吸附AKD,其加填紙在干燥過程中,這些被吸附的AKD更容易遷移至白泥碳酸鈣的孔隙內(nèi),使得能與纖維表面的羥基反應產(chǎn)生憎水性能的有效AKD的量減少,最終AKD施膠效率較差。基于碳化白泥碳酸鈣對AKD施膠影響機理的研究結(jié)果,研究分別采用聚乙二醇和聚丙烯酸鈉協(xié)同碳化,改善白泥碳酸鈣形貌和孔結(jié)構(gòu),進而強化加填紙的施膠效果。結(jié)果表明,采用聚乙二醇協(xié)同碳化處理可改善白泥碳酸鈣的孔體積及孔徑,從而達到控制白泥碳酸鈣品質(zhì)的目的,但其品質(zhì)與商品輕質(zhì)碳酸鈣相比存在一定差距。采用聚丙烯酸鈉協(xié)同碳化,通過調(diào)控碳化白泥碳酸鈣的細小粒子含量,細小粒子表面形貌,碳化白泥碳酸鈣的比表面積、孔體積及孔徑來達到控制碳化白泥碳酸鈣的品質(zhì)的目的。研磨前投料由于機械摩擦會破壞聚丙烯酸鈉與白泥碳酸鈣的作用,碳化過程中聚丙烯酸鈉對白泥碳酸鈣細小粒子及微觀性能的調(diào)控作用減弱,不利于對白泥碳酸鈣品質(zhì)的控制;研磨后投料聚丙烯酸鈉能有效控制細小粒子的含量,有利于控制白泥碳酸鈣品質(zhì)。碳化精制過程中,直接投放聚丙烯酸鈉液體可有效控制白泥碳酸鈣品質(zhì);投放聚丙烯酸鈉固體協(xié)同碳化時,需要提供一定溶解時間以利于聚丙烯酸鈉溶解,溶解時間越長,碳化精制得到的白泥碳酸鈣的品質(zhì)越好。
[Abstract]:White clay calcium carbonate is the solid waste of alkali recovery section in papermaking industry. It can replace light calcium carbonate as paper filler, and its economic and environmental benefits are obvious. During the process of refining the white mud calcium carbonate as paper filler, it was found that the AKD sizing efficiency of the paper was significantly decreased after the filling of the white mud calcium carbonate filler made from carbon dioxide COST2). Therefore, in order to improve the quality and application performance of calcium carbonate after carbonization, the application of calcium carbonate in white mud as paper filler is limited. In this paper, the influence mechanism of carbonation refining process on the quality of calcium carbonate in white mud and the sizing performance of filler paper was studied, and on the basis of that, the effect of carbonation process on the quality of calcium carbonate was studied. To improve the quality of calcium carbonate in white mud, the quality of calcium carbonate in white mud can be improved by adjusting and controlling the process of carbonization refining with additives, so as to provide the basis for improving the quality control of the recovery of calcium carbonate from white mud. The main research results of this paper are as follows: the influence of carbonization degree on sizing performance is studied. The results show that the higher the carbonation degree is. The more the content of fine particles in white clay calcium carbonate is, the worse the AKD sizing performance of the corresponding paper is. The content of fine particles is one of the important factors that affect the sizing performance of calcium carbonate in carbonized white mud. The effect of calcium carbonate in carbonized white mud on the sizing properties of AKD paper and its mechanism are studied and expounded. The results showed that although the low retention characteristics of calcium carbonate particles in the papermaking process would lead to the loss of some AKD adsorbed by the particles, the enhanced retention of the fine particles of calcium carbonate particles in white mud was adopted. Does not improve the sizing performance of the filling paper. The loss of AKD caused by the low retention of fine particles is not the main cause of poor sizing performance of calcium carbonate in carbonized white mud paper, but mainly due to the irregular surface morphology of the fine particles. Calcium carbonate carbonated white mud has large specific surface area, pore volume and pore size, and it is easier to adsorb AKD. During the drying process, the adsorbed AKD is easier to migrate to the pore of calcium carbonate in white mud. The amount of effective AKD which can react with hydroxyl groups on the fiber surface to produce hydrophobicity is reduced, and the final AKD sizing efficiency is poor. Based on the results of the study on the influence mechanism of calcium carbonate from carbonized white mud on AKD sizing. The morphology and pore structure of calcium carbonate in white mud were improved by co-carbonation of polyethylene glycol and sodium polyacrylate respectively, and the sizing effect of filler paper was strengthened. The pore volume and pore size of calcium carbonate in white mud can be improved by using polyethylene glycol in combination with carbonization, thus the quality of calcium carbonate in white mud can be controlled. However, the quality of calcium carbonate is different from that of light calcium carbonate. Sodium polyacrylate combined with carbonation is used to regulate the content of fine particles and the morphology of fine particles in carbonized white mud calcium carbonate. The specific surface area, pore volume and pore size of calcium carbonate in carbonized white mud were used to control the quality of calcium carbonate. The effect of sodium polyacrylate and calcium carbonate in white mud could be destroyed by mechanical friction before grinding. The effect of sodium polyacrylate on the fine particles and microscopic properties of calcium carbonate in white mud was weakened during carbonation, which was not conducive to the quality control of calcium carbonate in white mud. The content of fine particles can be effectively controlled by adding sodium polyacrylate after grinding, and the quality of calcium carbonate in white mud can be controlled by adding sodium polyacrylate liquid directly in the process of carbonation refining, and the quality of calcium carbonate in white mud can be effectively controlled by adding sodium polyacrylate directly. When adding sodium polyacrylate solids together with carbonization, it is necessary to provide a certain time of dissolution to facilitate the dissolution of sodium polyacrylate. The longer the time of dissolution, the better the quality of calcium carbonate obtained by carbonation refining.
【學位授予單位】：陜西科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TS727

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本文編號：1404418