稀土碳酸盐新型煅烧系统的研究与设计

发布时间：2018-02-17 01:25

  本文关键词： 稀土 碳酸盐 多膛炉 煅烧 设计　出处：《西安建筑科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：稀土氧化物广泛应用于半导体材料、研磨材料、高级颜料、感光玻璃的增感剂及汽车尾气的净化器方面。目前稀土氧化物采用推板窑煅烧碳酸盐生产工艺,存在不连续、物料加热不均、反应速度慢、劳动强度大、单位产品能耗高等问题。本研究在文献资料和借鉴其他行业生产实践的基础上,针对甘肃稀土公司原有碳酸铈煅烧氧化铈工艺,研究设计了一种新型煅烧工艺,以强化传热过程、缩短煅烧时间,降低生产能耗和提高劳动生产率,实现连续化生产的目的。本设计采用多膛炉直接连续煅烧工艺,在碳酸铈相关煅烧基础实验基础上、通过煅烧炉的物料和热平衡计算、确定了多膛煅烧炉炉型及结构尺寸,同时进行了煅烧工艺辅助设备选择,设计研究完成的主要工作如下:(1)对碳酸铈进行了热重分析实验,研究了不同煅烧温度下制备氧化铈的密度、粒度及特性规律,结果表明:800℃下,60 min可以完成脱水和分解;煅烧生产的氧化铈密度随煅烧温度升高有所增大,不同温度下煅烧后碳酸铈物料的颗粒粒径主要分布范围在0.5~140μm。为多膛炉设计提供了重要的设计参数;(2)基于多膛炉的物料和热平衡计算,分析了多膛炉内物料走向和热量的分布情况;理论计算出多膛炉的主要结构尺寸:多膛炉共分8层,每层高度900 mm,内径为2640 mm,外径为3080 mm;根据烟气成分、特征及产品特性,选定了袋式除尘器、粉状物料板式换热器等辅助设备;(3)对多膛炉的典型工作段进行数值模拟,模拟了多膛炉内的速度、压力、温度分布情况,模拟结果基本符合实际预想。本研究为进一步开展工业试验奠定了理论基础,对稀土行业碳酸盐煅烧设备的节能增效具有一定的参考价值。
[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，

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