Thermal and carbothermic decomposition of Na2CO3 and Li2CO3

炭黑 分解 热分解 碳纤维 碳酸钠 热重分析 碳酸盐 材料科学 熔点 化学工程 冶金 化学 复合材料 有机化学 天然橡胶 复合数 工程类
作者
Jongwan Kim,Hae-Geon Lee
出处
期刊:Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science [Springer Science+Business Media]
卷期号:32 (1): 17-24 被引量:184
标识
DOI:10.1007/s11663-001-0003-0
摘要

In order to elucidate the decomposition mechanism of Na2CO3 and Li2CO3 in mold-powder systems employed in the continuous casting of steel, decompositions of Na2CO3 and Li2CO3 were investigated using thermogravimetric (TG) and differential scanning calorimetric (DSC) methods at temperatures up to 1200 °C, under a flow of argon gas. For the case of pure Na2CO3, the thermal decomposition started from its melting point and continued as the temperature was increased, but at a very slow rate. For Li2CO3, however, the decomposition occurred at much faster rates than that for Na2CO3. When carbon black was added to the carbonate particles, the decomposition rates of both Na2CO3 and Li2CO3 were significantly enhanced. From mass-balanced calulations and X-ray diffraction (XRD) analyses of the reaction products, it is concluded that decompositions of Na2CO3 and Li2CO3 with carbon black take place according to the respective reactions of Na2CO3 (1) + 2C (s) = 2Na (g) + 3CO (g) and Li2CO3 (l) + C (s) = Li2O (s) + 2CO (g). It was found that liquid droplets of Na2CO3 were initially isolated due to carbon particles surrounding them, but, as the carbon particles were consumed, the liquid droplets were gradually agglomerated. This effected a reduction of the total surface area of the carbonate, resulting in a dependence of the decomposition rate on the amount of carbon black. For the case of Li2CO3, on the other hand, hardly any agglomeration occurred up to the completion of decomposition, and, hence, the rate was almost independent of the amount of carbon black mixed. The apparent activation energies for the decomposition of Na2CO3 and Li2CO3 with carbon black were found to be similar and were estimated to be 180 to 223 kJ mole−1.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
1秒前
1秒前
chx完成签到,获得积分10
1秒前
2秒前
完美世界应助YZQ采纳,获得10
2秒前
2秒前
ding应助adam采纳,获得10
2秒前
华仔应助简单的小鸽子采纳,获得10
3秒前
木木发布了新的文献求助10
3秒前
3秒前
llll发布了新的文献求助10
4秒前
4秒前
tramp应助小汤圆采纳,获得10
4秒前
4秒前
solitude完成签到,获得积分10
5秒前
独特冬天完成签到,获得积分10
5秒前
6秒前
经久发布了新的文献求助10
7秒前
北城完成签到,获得积分10
7秒前
艾尼呼啦圈完成签到,获得积分10
7秒前
7秒前
所所应助Re采纳,获得10
8秒前
量子星尘发布了新的文献求助10
8秒前
LArry发布了新的文献求助10
8秒前
9秒前
山河发布了新的文献求助20
9秒前
10秒前
11秒前
小马甲应助温婉的松鼠采纳,获得10
11秒前
赶紧让我毕业吧完成签到,获得积分10
12秒前
斯文莺发布了新的文献求助10
13秒前
landiao完成签到,获得积分10
14秒前
15秒前
lllwww发布了新的文献求助30
15秒前
16秒前
16秒前
想要礼物的艾斯米拉达完成签到,获得积分10
17秒前
旺仔Mario完成签到,获得积分10
17秒前
顾矜应助landiao采纳,获得10
18秒前
18秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988827
求助须知:如何正确求助?哪些是违规求助? 3531197
关于积分的说明 11252739
捐赠科研通 3269830
什么是DOI,文献DOI怎么找? 1804815
邀请新用户注册赠送积分活动 881915
科研通“疑难数据库(出版商)”最低求助积分说明 809028