氢氧化镁碳化过程研究

陈闵敏; 孙玉柱; 宋兴福; 唐智新; 吴刚

doi:10.14135/j.cnki.1006-3080.20210511001

氢氧化镁碳化过程研究

doi: 10.14135/j.cnki.1006-3080.20210511001

陈闵敏^{1, 2,},
孙玉柱^{1, 2, 3, ,},
宋兴福^{1, 2},
唐智新²,
吴刚²

1.
华东理工大学资源（盐湖）过程工程教育部工程研究中心，上海 200237
2.
河北省海水淡化技术创新中心，唐山 063200
3.
上海污染控制与生态安全研究院，上海 200092

基金项目: 国家重点研发计划(2016YFC0401203, 2019YFC0408204)；国家自然科学基金(U1507105)，上海市优秀学术/技术带头人计划资助(18XD1424600)

详细信息

作者简介:
陈闵敏(1995-)，男，硕士生，研究方向为海水化学资源利用。E-mail：15216829358@163.com

通讯作者:
孙玉柱，E-mail：yzsun@ecust.edu.cn

中图分类号: TQ115
计量
- 文章访问数: 45
- HTML全文浏览量: 24
- PDF下载量: 11
- 被引次数: 0
出版历程
- 收稿日期: 2021-05-11
- 网络出版日期: 2021-07-23

Study on the carbonization process of magnesium hydroxide

CHEN Minmin^{1, 2
,},
SUN Yuzhu^{1, 2, 3
, ,},
SONG Xingfu^{1, 2},
TANG Zhixin²,
WU Gang²

1.
Engineering Research Center of Resources (Salt Lake) Process Engineering, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
2.
Hebei Desalination Technology Innovation Center, Tangshan 063200, Hebei China
3.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China

摘要

摘要: 研究了氢氧化镁碳化制备碳酸氢镁的过程，考察了液固比、浆料温度、二氧化碳气速、搅拌速度以及氢氧化镁原料差异对碳化过程的影响。结果表明：在常温常压下，液固比40、二氧化碳气速400 mL/min、搅拌速度300 r/min时碳化效果最佳；氢氧化镁粒度越小、分散性越好对碳化过程越有利；分析纯与自制氢氧化镁碳化所得碳酸氢镁溶液中镁离子浓度分别为0.315 mol/L以及0.203 mol/L；同时对碳化过程氢氧化镁缩壳模型进行了简要探讨，碳化过程拟合呈现出较好的线性。
- 氢氧化镁 /
- 碳化法 /
- 二氧化碳 /
- 碳酸氢镁
Abstract: With the rapid progress of seawater desalination technology, concentrated brine has not been effectively used due to the lack of mature development and treatment process. Direct emissions of concentrated brine are seriously harmful to the ecological environment. At the same time, massive emissions of carbon dioxide have exacerbated the greenhouse effect. Aiming at the resource utilization of concentrated brine and carbon dioxide, combined with the previous research basis of using calcium hydroxide as the precipitant to prepare magnesium hydroxide, this paper proposes a carbonization technical process to prepare magnesium bicarbonate using magnesium hydroxide as the precursor from low magnesium systems. The research focuses on the carbonization process of magnesium hydroxide, investigating the influence of liquid-solid ratio, temperature, carbon dioxide gas velocity, stirring speed, and raw material difference on the carbonization process, and monitoring the change of calcium and magnesium ion concentration and pH value during the carbonization process. It was found that under room temperature and atmospheric pressure, the carbonization effect is the best when the liquid-solid ratio is 40, the carbon dioxide gas velocity is 400 mL/min, and the stirring speed is 300 r/min, the concentration of Mg²⁺ in the carbonization solution from analytical purity magnesium hydroxide is 0.315 mol/L and there exists no Ca²⁺, the concentration of Mg²⁺ in the carbonization solution from self-made magnesium hydroxide is 0.203 mol/L, the concentration of Ca²⁺ is 3.2×10⁻⁴ mol/L, calcium impurities are basically separated. The particle size and dispersion of magnesium hydroxide have significant impact on the carbonization effect: smaller particle size and better dispersion promote the carbonization process. The shrinking core model of magnesium hydroxide is briefly discussed at the same time, the fits of the carbonization process at different slurry temperatures show good linearity.
- Magnesium hydroxide /
- carbonization method /
- carbon dioxide /
- magnesium bicarbonate

HTML全文

图 1 Mg(OH)₂碳化实验装置图

Figure 1. Drawing of experimental device for the carbonization process of Mg(OH)₂

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图 2 不同液固比下Mg²⁺浓度与pH值随时间变化曲线

Figure 2. Concentration of Mg²⁺ and pH change curve with time under different liquid-solid ratios

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图 3 不同浆料温度下Mg²⁺浓度与pH值随时间变化曲线

Figure 3. Concentration of Mg²⁺ and pH change curve with time under different slurry temperatures

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图 4 不同CO₂气速下Mg²⁺浓度与pH值随时间变化曲线

Figure 4. Concentration of Mg²⁺ and pH change curve with time under different CO₂ gas velocity

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图 5 不同搅拌速度下Mg²⁺浓度与pH值随时间变化曲线

Figure 5. Concentration of Mg²⁺ and pH change curve with time under different stirring speeds

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图 6 不同CO₂气速下自制氢氧化镁浆料Mg²⁺、Ca²⁺浓度与pH值随时间变化曲线

Figure 6. Concentration of Mg²⁺ and Ca²⁺, pH change curve with time under different CO₂ gas velocity

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图 7 一次碳化（a）、二次碳化（b）后固体XRD谱图

Figure 7. XRD patterns of solid after primary (a) and secondary carbonization (b) (Velocity of CO₂: 400 mL/min)

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图 8 1-(1-x)^1/3-t, 1-(1-x)^2/3-t线性拟合图

Figure 8. 1-(1-x)^1/3-t, 1-(1-x)^2/3-t linear fitting diagram

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表 1 分析纯与自制氢氧化镁指标对照表

Table 1. Index comparison table of analytical grade and self-made magnesium hydroxide

Reference Index	D[3,2] /µm	D[4,3] /µm	D₅₀ /µm	Content of Mg(OH)₂/wt%	Content of CaO /wt%	Content of SO₄^2-/wt%	Content of Cl^-/wt%
Mg(OH)₂(AR)	1.35	2.13	1.92	95.00	−	−	0.01
Mg(OH)₂(self-made)	4.79	6.49	5.48	92.50	1.59	2.18	0.10

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