微晶菱镁矿蒸氨及水化动力学研究

doi:10.11949/0438-1157.20221587

化工学报 ›› 2023, Vol. 74 ›› Issue (4): 1578-1586.DOI: 10.11949/0438-1157.20221587

• 催化、动力学与反应器 • 上一篇下一篇

微晶菱镁矿蒸氨及水化动力学研究

衣思敏¹(), 马亚丽¹^,²^,³^,⁴, 刘伟强¹, 张金帅¹, 岳岩¹, 郑强¹^,²^,³^,⁴, 贾松岩¹^,²^,³^,⁴, 李雪¹^,²^,³^,⁴()

^1.沈阳化工大学化学工程学院，辽宁沈阳 110020
^2.教育部资源化工与材料重点实验室，辽宁沈阳 110020
^3.辽宁省化工应用技术重点实验室，辽宁沈阳 110020
^4.辽宁省镁钙资源无机功能材料工程研究中心，辽宁沈阳 110020

收稿日期:2022-12-09 修回日期:2023-02-26 出版日期:2023-04-05 发布日期:2023-06-02
通讯作者: 李雪
作者简介:衣思敏（1998—），女，硕士研究生，y06100319@163.com
基金资助:
2020—2022年辽宁省普通本科高等学校校际合作项目（辽教发[2020]28号文件）;2021—2023年辽宁省科技厅创新能力提升联合基金项目(2021-NLTS-12-04);辽宁省自然科学基金项目(2022-BS-210)

Study on ammonia evaporation and hydration kinetics of microcrystalline magnesite

Simin YI¹(), Yali MA¹^,²^,³^,⁴, Weiqiang LIU¹, Jinshuai ZHANG¹, Yan YUE¹, Qiang ZHENG¹^,²^,³^,⁴, Songyan JIA¹^,²^,³^,⁴, Xue LI¹^,²^,³^,⁴()

^1.College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110020, Liaoning, China
^2.Key Laboratory of Resource Chemicals and Materials, Ministry of Education, Shenyang 110020, Liaoning, China
^3.Liaoning Provincial Key Laboratory of Chemical Application Technology, Shenyang 110020, Liaoning, China
^4.Liaoning Magnesium-Calcium Inorganic Functional Materials Engineering Research Center, Shenyang 110020, Liaoning, China

Received:2022-12-09 Revised:2023-02-26 Online:2023-04-05 Published:2023-06-02
Contact: Xue LI

摘要/Abstract

摘要：

为加强微晶菱镁矿的深入研究，分别以微晶菱镁矿经高温煅烧所得微晶MgO和辽宁某工厂轻烧MgO为原料进行蒸氨、沉镁、煅烧得到MgO，并进行水化实验。采用水合法考察了MgO活性对蒸氨动力学的影响，探究了反应温度、固液比对产品粒径及水化率的影响，考察了不同固液比所得产品形貌，并对水化曲线进行分析，确定了不同镁源的水化反应控制类型。结果表明：二者的蒸氨反应都受扩散控制；在100℃、9 h条件下，固液比为1/5时，微晶MgO水化产品呈完整的六方片状结构，而轻烧MgO水化产品的片状结构大小不一且不规整；二者水化反应均属于化学反应控制类型。此研究为微晶菱镁矿的利用发展提供了新思路。

关键词: 微晶菱镁矿, 粉体技术, 蒸氨反应, 热解, 动力学

Abstract:

In order to strengthen the further study of micrystalline magnesite, the microcrystalline MgO obtained from calcined microcrystalline magnesite and the light burned MgO from a factory in Liaoning are used as raw materials for steaming ammonia, precipitating magnesium and calcinating to obtain MgO, and conduct hydration experiment. The effect of MgO activity on ammonia evaporation kinetics was investigated by water method, and the effects of reaction temperature and solid-liquid ratio on particle size and hydration rate of products were investigated, the morphologies of products with different solid-liquid ratios were investigated, and hydration curves were analyzed to determine the hydration reaction control types of different magnesium sources. The results show that the evaporation of ammonia in both of them is controlled by diffusion. Under the conditions of 100℃ and 9 h, when the solid-liquid ratio is 1/5, the microcrystalline MgO hydration product has a complete hexagonal sheet structure, while the sheet structure of the lightly burned MgO hydration product is different in size and irregular. Both hydration reactions belong to the internal diffusion chemical reaction control type. This study provides a new idea for the utilization and development of micrystalline magnesite.

Key words: microcrystalline magnesite, powder technology, ammonia evaporation reaction, pyrolysis, kinetics

中图分类号:

TQ 132.2

衣思敏, 马亚丽, 刘伟强, 张金帅, 岳岩, 郑强, 贾松岩, 李雪. 微晶菱镁矿蒸氨及水化动力学研究[J]. 化工学报, 2023, 74(4): 1578-1586.

Simin YI, Yali MA, Weiqiang LIU, Jinshuai ZHANG, Yan YUE, Qiang ZHENG, Songyan JIA, Xue LI. Study on ammonia evaporation and hydration kinetics of microcrystalline magnesite[J]. CIESC Journal, 2023, 74(4): 1578-1586.

图/表 12

表1 不同MgO主要成分

Table 1 Main components of different MgO

成分	微晶MgO主要成分含量/%	轻烧MgO主要成分含量/%
MgO	96.15	75.83
CaO	1.55	7.21
SiO₂	0.24	10.25
Fe₂O₃	0.05	2.04

表2 不同原料所得水化MgO中活性MgO含量

Table 2 Active MgO content in hydrated MgO obtained from different raw materials

样品编号	以微晶MgO为原料活性MgO含量/%	以轻烧MgO为原料活性MgO含量/%
1	75.15	56.14
2	76.52	56.35
3	76.47	54.77
平均值	76.05	55.75

图1 不同原料Mg2+浸出率曲线

Fig.1 Curve of leaching rate of Mg2+ from different raw materials

图2 不同温度下不同原料蒸氨反应拟合关系

Fig.2 The fitting relation of ammonia evaporation reaction of different raw materials at different temperatures

图3 不同原料蒸氨lnk-1/T关系曲线

Fig.3 lnk-1/T of ammonia of different raw materials

图4 反应温度、固液比对产品粒径的影响

Fig.4 Effect of reaction temperature and solid-liquid ratio on particle size of product

图5 反应温度、固液比对水化率的影响

Fig.5 Effect of reaction temperature and solid-liquid ratio on hydration rate

图6 反应温度为100℃、反应时间为3 h的水化产物SEM图

Fig.6 SEM images of hydration products at reaction temperature of 100℃ and reaction time of 3 h

图7 反应温度为100℃、反应时间为3 h的水化产物XRD谱图

Fig.7 XRD patterns of hydration products at reaction temperature of 100℃ and reaction time of 3 h

图8 不同原料水化曲线

Fig.8 Hydration curves of different raw materials

图9 不同温度下不同原料水化反应拟合关系

Fig.9 The fitting relation of hydration reaction of different raw materials at different temperatures

图10 不同原料水化lnk-1/T关系曲线

Fig.10 lnk-1/T curves of hydration of different raw materials

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微晶菱镁矿蒸氨及水化动力学研究

Study on ammonia evaporation and hydration kinetics of microcrystalline magnesite

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