本文關鍵詞： 納米碳酸鈣 常溫碳化 高濃度CO_2 壓濾水循環(huán) 節(jié)能降耗　出處：《華東理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：納米碳酸鈣作為一種功能性填料廣泛應用于多種行業(yè),同時它也是一個能耗較高的產(chǎn)業(yè),在堅持走可持續(xù)發(fā)展道路的今天,碳酸鈣的生產(chǎn)不僅要追求產(chǎn)品的優(yōu)越性能,同時也要關注生產(chǎn)過程的低能耗,如何提高產(chǎn)品的應用性能和減少生產(chǎn)過程的能耗一直是納米碳酸鈣應用技術研究的熱點,這不僅是碳酸鈣生產(chǎn)工藝的發(fā)展方向,而且也是提高碳酸鈣產(chǎn)業(yè)經(jīng)濟效益的重要手段。 本文采用常溫碳化技術合成立方形納米碳酸鈣,研究了晶體成核、生長過程晶型控制劑在納米碳酸鈣表面的吸附情況及其對納米碳酸鈣形貌控制的機理,探討了碳化反應工藝條件對納米碳酸鈣晶體成核、生長、凝并和最終形貌的影響,重點考察溫度、高濃度C02氣體作為氣源對納米碳酸鈣形貌的控制作用；改進常溫碳化工藝,合成分散性好的納米碳酸鈣粉體,并對粉體的應用性能進行表征；研究了工藝壓濾水循環(huán)利用的可行性,為納米碳酸鈣工業(yè)生產(chǎn)節(jié)能技術提供了技術的支持。 晶型控制劑吸附在碳酸鈣表面控制其形貌為立方形,碳化反應溫度通過改變晶型控制劑在活性碳酸鈣表面吸附率來改變形貌。溫度升高,吸附率減小,生長快,凝并加劇,形貌不可控,增加晶型控制劑在體系中的濃度可以合成立方形納米碳酸鈣。常溫時,高濃度CO2氣體作為氣源,傳質效果不佳,凝并生長增強,納米碳酸鈣粒徑分布不均勻,加強體系的攪拌強度,可以緩解粒度分布不均勻現(xiàn)象。 改進常溫碳化工藝合成了形貌規(guī)整、粒度分布均勻的立方形納米碳酸鈣,增加了粉體的分散性。對碳化新工藝進行工業(yè)試驗,工業(yè)釜內傳質效果稍差,但是納米碳酸鈣產(chǎn)品的各項性能指標均與小試一致,且其分散性等應用性能優(yōu)于普通納米碳酸鈣。 本文最后就壓濾水循環(huán)利用的可行性進行研究,結果表明,納米碳酸鈣生產(chǎn)工藝的壓濾水可循環(huán)利用,晶型控制劑的補充添加量按系統(tǒng)中晶型控制劑的實際濃度計算較為合理。
[Abstract]:As a kind of functional filler, nanometer calcium carbonate is widely used in many industries, at the same time, it is also an industry with high energy consumption. In today's sustainable development, the production of calcium carbonate should not only pursue the superior performance of the products. At the same time, we should also pay attention to the low energy consumption in the production process. How to improve the application performance of the products and reduce the energy consumption in the production process has always been the focus of research on the application technology of nanometer calcium carbonate, which is not only the development direction of the production process of calcium carbonate, It is also an important means to improve the economic benefit of calcium carbonate industry. In this paper, square nanometer calcium carbonate was formed by normal temperature carbonization technique. The adsorption of crystal shape control agent on the surface of nanometer calcium carbonate and the mechanism of controlling the morphology of nanometer calcium carbonate were studied. The effects of carbonation conditions on the nucleation, growth, condensation and final morphology of nanocrystalline calcium carbonate were discussed. The effects of temperature, high concentration CO2 gas as gas source on the morphology of nanometer calcium carbonate were investigated, and the carbonation process at room temperature was improved. Nano-CaCO3 powders with good dispersity were synthesized and their application properties were characterized. The feasibility of water recycling by pressure-filtration was studied, which provided technical support for energy-saving technology of nano-CaCO3 production. The morphology of the crystal type control agent adsorbed on the surface of calcium carbonate is square. The temperature of carbonation reaction changes the morphology by changing the adsorption rate of the crystal type control agent on the surface of active calcium carbonate. The morphology is out of control, increasing the concentration of crystal type control agent in the system can make the square nanometer calcium carbonate. At room temperature, the high concentration of CO2 gas as the gas source, the effect of mass transfer is not good, the coagulation and growth are enhanced, and the particle size distribution of nanometer calcium carbonate is not uniform. Strengthening the agitation strength of the system can alleviate the uneven distribution of particle size. A square nanometer calcium carbonate with regular morphology and uniform particle size distribution was synthesized by improving the normal temperature carbonization process, and the dispersion of the powder was increased. The industrial test of the new carbonization process showed that the effect of mass transfer in the industrial kettle was slightly poor. However, the properties of nanometer calcium carbonate are consistent with those of small scale test, and its dispersity is superior to that of ordinary nanometer calcium carbonate. Finally, the feasibility of pressure filtration water recycling is studied. The results show that the pressure filter water produced by nanometer calcium carbonate can be recycled. The addition of crystal type control agent is reasonable according to the actual concentration of crystal type control agent in the system.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TQ132.32

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