本文關(guān)鍵詞： 稀土 碳酸鹽 多膛爐 煅燒 設(shè)計(jì)　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：稀土氧化物廣泛應(yīng)用于半導(dǎo)體材料、研磨材料、高級(jí)顏料、感光玻璃的增感劑及汽車尾氣的凈化器方面。目前稀土氧化物采用推板窯煅燒碳酸鹽生產(chǎn)工藝,存在不連續(xù)、物料加熱不均、反應(yīng)速度慢、勞動(dòng)強(qiáng)度大、單位產(chǎn)品能耗高等問題。本研究在文獻(xiàn)資料和借鑒其他行業(yè)生產(chǎn)實(shí)踐的基礎(chǔ)上,針對(duì)甘肅稀土公司原有碳酸鈰煅燒氧化鈰工藝,研究設(shè)計(jì)了一種新型煅燒工藝,以強(qiáng)化傳熱過(guò)程、縮短煅燒時(shí)間,降低生產(chǎn)能耗和提高勞動(dòng)生產(chǎn)率,實(shí)現(xiàn)連續(xù)化生產(chǎn)的目的。本設(shè)計(jì)采用多膛爐直接連續(xù)煅燒工藝,在碳酸鈰相關(guān)煅燒基礎(chǔ)實(shí)驗(yàn)基礎(chǔ)上、通過(guò)煅燒爐的物料和熱平衡計(jì)算、確定了多膛煅燒爐爐型及結(jié)構(gòu)尺寸,同時(shí)進(jìn)行了煅燒工藝輔助設(shè)備選擇,設(shè)計(jì)研究完成的主要工作如下:(1)對(duì)碳酸鈰進(jìn)行了熱重分析實(shí)驗(yàn),研究了不同煅燒溫度下制備氧化鈰的密度、粒度及特性規(guī)律,結(jié)果表明:800℃下,60 min可以完成脫水和分解;煅燒生產(chǎn)的氧化鈰密度隨煅燒溫度升高有所增大,不同溫度下煅燒后碳酸鈰物料的顆粒粒徑主要分布范圍在0.5~140μm。為多膛爐設(shè)計(jì)提供了重要的設(shè)計(jì)參數(shù);(2)基于多膛爐的物料和熱平衡計(jì)算,分析了多膛爐內(nèi)物料走向和熱量的分布情況;理論計(jì)算出多膛爐的主要結(jié)構(gòu)尺寸:多膛爐共分8層,每層高度900 mm,內(nèi)徑為2640 mm,外徑為3080 mm;根據(jù)煙氣成分、特征及產(chǎn)品特性,選定了袋式除塵器、粉狀物料板式換熱器等輔助設(shè)備;(3)對(duì)多膛爐的典型工作段進(jìn)行數(shù)值模擬,模擬了多膛爐內(nèi)的速度、壓力、溫度分布情況,模擬結(jié)果基本符合實(shí)際預(yù)想。本研究為進(jìn)一步開展工業(yè)試驗(yàn)奠定了理論基礎(chǔ),對(duì)稀土行業(yè)碳酸鹽煅燒設(shè)備的節(jié)能增效具有一定的參考價(jià)值。
[Abstract]:Rare earth oxides are widely used in semiconductor materials, grinding materials, advanced pigments, sensitizers for photosensitive glass and purifiers for automobile exhaust gas. The problems of uneven heating, slow reaction speed, large labor intensity and high energy consumption per unit product are discussed in this paper. Based on the literature and practice in other industries, the original cerium carbonate calcination process in Gansu rare earth company is studied. A new type of calcination process is designed to enhance heat transfer, shorten calcination time, reduce energy consumption and increase labor productivity, and realize the purpose of continuous production. Based on the basic experiment of cerium carbonate related calcinations and the calculation of material and heat balance of calciner, the furnace type and structure size are determined, and the auxiliary equipment of calcination process is selected. The main work of the design and research is as follows: (1) the thermogravimetric analysis of cerium carbonate is carried out, and the density, particle size and characteristics of cerium oxide prepared at different calcination temperatures are studied. The results show that the dehydration and decomposition of cerium carbonate can be completed at 80 鈩，

本文編號(hào)：1516893