本文選題：活性氧化鎂 + 動(dòng)態(tài)煅燒　； 參考：《河北科技大學(xué)》2015年碩士論文

【摘要】：活性氧化鎂作為重要的無機(jī)化工產(chǎn)品,因其可具有不同的活性,在氯丁橡膠、膠黏劑、輪胎、輸送帶、醫(yī)藥、硅鋼、熒光粉等不同行業(yè)中得到了廣泛的應(yīng)用。目前,活性氧化鎂的制備方法主要是通過煅燒菱鎂礦、水氯鎂石、水鎂石、堿式碳酸鎂和氫氧化鎂得到,工業(yè)上煅燒反應(yīng)器主要是回轉(zhuǎn)煅燒爐和旋流動(dòng)態(tài)煅燒爐。但是這兩種煅燒設(shè)備在生產(chǎn)活性氧化鎂時(shí)存在著產(chǎn)品活性不均勻、活性不可控的缺點(diǎn):回轉(zhuǎn)煅燒爐設(shè)備直徑較大,加熱時(shí)容易造成內(nèi)部溫度低,爐壁溫度高等現(xiàn)象;而旋流動(dòng)態(tài)煅燒爐則是瞬間煅燒,煅燒時(shí)間短,造成煅燒不完全。本論文提出采用多層流化床煅燒爐作為氫氧化鎂煅燒設(shè)備,以實(shí)現(xiàn)活性氧化鎂活性的可控性和均勻性,并通過冷模實(shí)驗(yàn)和熱態(tài)實(shí)驗(yàn)對其流化現(xiàn)象、煅燒結(jié)果進(jìn)行分析研究,以探索適宜的結(jié)構(gòu)形式和操作參數(shù)。本論文首先對來自南風(fēng)集團(tuán)的氫氧化鎂在馬弗爐中進(jìn)行靜態(tài)煅燒,探討其在不同煅燒溫度、煅燒時(shí)間、升溫速率等條件下,影響活性氧化鎂活性的因素。結(jié)果表明:在煅燒溫度450℃,煅燒時(shí)間1h,升溫速率20min條件下煅燒制備得到的氧化鎂活性最高,其吸碘值最高可達(dá)到127 mg I2/g MgO,純度達(dá)到92%,BET為57m2/g。設(shè)計(jì)了冷態(tài)的多層流化床結(jié)構(gòu),實(shí)驗(yàn)研究了不同分布板形式及溢流管形式對氫氧化鎂流態(tài)化效果的影響。結(jié)果表明:分布器采用風(fēng)帽式,正方形排列方式,孔間距為22mm,風(fēng)帽高度為22mm,分布板為百葉窗式單旋導(dǎo)向?qū)娱g分布板,溢流管為直管型溢流管,實(shí)驗(yàn)用氫氧化鎂具有較好的流化效果。根據(jù)冷態(tài)實(shí)驗(yàn)結(jié)果,設(shè)計(jì)制造了熱態(tài)多層流化床煅燒裝置,并對氫氧化鎂進(jìn)行不同溫度下的煅燒,探討產(chǎn)品活性氧化鎂活性變化以及在空氣中的吸潮性。結(jié)果表明,在熱態(tài)多層流化床中高溫流體介質(zhì)分布均勻,床層內(nèi)部溫度分布均勻,氫氧化鎂呈現(xiàn)流化狀態(tài),顆粒表面受熱均勻。在實(shí)際操作中通過調(diào)節(jié)進(jìn)料量和各層的煅燒溫度,多層流化床煅燒裝置可以實(shí)現(xiàn)氧化鎂產(chǎn)品的活性可控,較好地解決了工業(yè)回轉(zhuǎn)煅燒爐和旋流動(dòng)態(tài)煅燒爐中產(chǎn)品活性不可控的問題。與靜態(tài)煅燒制備的活性氧化鎂相比,多層流化床煅燒制備的氧化鎂具有較高的活性,吸碘值、比表面積值均較高。其中吸碘值可達(dá)到142 mgI2/g Mg O,純度可達(dá)到92%,而BET值則高達(dá)147m2/g。
[Abstract]:As an important inorganic chemical product, active magnesium oxide has been widely used in many industries, such as neoprene, adhesive, tire, conveyor belt, medicine, silicon steel, phosphor and so on. At present, the preparation of active magnesium oxide is mainly obtained by calcining magnesite, hydrochlorite, brucite, basic magnesium carbonate and magnesium hydroxide. However, these two kinds of calcinations have the disadvantages of uneven product activity and uncontrollable activity in the production of active magnesium oxide: the rotary calciner has a large diameter, which can easily lead to low internal temperature and high furnace wall temperature when heated; The swirl dynamic calciner is instantaneous calcinations, short calcination time, resulting in incomplete calcination. In this paper, the multilayer fluidized bed calciner is used as the calcining equipment of magnesium hydroxide to realize the controllability and uniformity of the activity of active magnesium oxide, and the fluidization phenomenon and the calcination result are analyzed through cold model experiment and hot state experiment. In order to explore the appropriate structure and operational parameters. In this paper, the magnesium hydroxide from Nanfeng Group was first calcined in a muffle furnace, and the factors affecting the activity of active magnesium oxide were discussed under different calcination temperature, calcination time and heating rate. The results show that under the conditions of calcination temperature 450 鈩，

本文編號(hào)：1825281