水力空化强化碳化反应制备碱式碳酸镁的实验研究

doi:10.19964/j.issn.1006-4990.2023-0529

Abstract

Abstract:

In order to enhance microscopic mixing and mass transfer and to increase the Mg（OH）₂ carbonation rate，hydrodynamic cavitation technology was employed to intensify the carbonation reaction of Mg（OH）₂ and CO₂ to produce the intermediate product Mg（HCO₃）₂，which was then pyrolyzed to produce basic magnesium carbonate［4MgCO₃·Mg（OH）₂·4H₂O］.An orthogonal experimental design was used to investigate the factors influencing the carbonation rate of Mg（OH）₂.The resulting products were characterized by using scanning electron microscopy，X-ray diffractometer，and a multi-parameter testing instrument.The results showed that the important order of factors affecting the Mg（OH）₂ carbonation rate was incident angle α>CO₂ flow rate q>Mg（OH）₂ solid content s>inlet pressure p>throat diameter d₀>carbonation time t.Under the process conditions of α=60°，d₀=4 mm，p=0.35 MPa，t=60 min，s=1.6%，and q=17 L/min，the carbonation rate reached 92.1%.It was a 31.57% improvement over the carbonation rate（60.53%） of a bubble⁃stirred reactor.The content of impurities such as CaO and Fe in the product 4MgCO₃·Mg（OH）₂·4H₂O was reduced，and the produced 4MgCO₃·Mg（OH）₂·4H₂O had a uniform flake structure with a crystal thickness of less than 50 nm.The product had good crystallization and relatively stable and single composition.Each diffraction peak position of the obtained product was completely consistent with the diffraction peak position of basic magnesium carbonate in the standard hexagonal crystal form.

Key words: hydrodynamic cavitation, carbonation reaction, basic magnesium carbonate, hydrodynamic cavitation reactor

CLC Number:

TQ132.2

YANG Hanshuo, WANG Dexi, YU Honglei, YANG Yali, JIANG Jiuchuang. Experimental study on hydrodynamic cavitation⁃enhanced carbothermic reduction process for production of magnesium carbonate hydromagnesite[J]. Inorganic Chemicals Industry, 2024, 56(7): 74-79.

Figures/Tables 8

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样品	w（MgO）	w（CaO）	w（Fe）
轻烧粉	92.6	0.82	0.28
碱式碳酸镁	41.5	0.15	0.009

水平	因素
水平	A 入射角α/（°）	B 喉径d₀/mm	C 入口压力p/MPa	D 碳化时间t/min	E Mg（OH）₂固含量s/%	F CO₂流量q/（L·min^-1）
1	40	4	0.25	30	1.0	13
2	45	5	0.30	40	1.2	14
3	50	6	0.35	50	1.4	15
4	55	7	0.40	60	1.6	16
5	60	8	0.45	70	1.8	17

序号	A	B	C	D	E	F	Φ/%
1	1	1	1	1	1	1	71.9
2	1	2	2	2	2	2	80.8
3	1	3	3	3	3	3	80.7
4	1	4	4	4	4	4	80.8
5	1	5	5	5	5	5	73.9
6	2	1	2	3	4	5	89.7
7	2	2	3	4	5	1	75.7
8	2	3	4	5	1	2	79.1
9	2	4	5	1	2	3	75.5
10	2	5	1	2	3	4	80.5
11	3	1	3	5	2	4	85.7
12	3	2	4	1	3	5	80.7
13	3	3	5	2	4	1	77.5
14	3	4	1	3	5	2	77.7
15	3	5	2	4	1	3	80.9
16	4	1	4	2	5	3	80.1
17	4	2	5	3	1	4	82.5
18	4	3	1	4	2	5	86.0
19	4	4	2	5	3	1	79.1
20	4	5	3	1	4	2	87.0
21	5	1	5	4	3	2	86.2
22	5	2	1	5	4	3	91.8
23	5	3	2	1	5	4	84.0
24	5	4	3	2	1	5	87.4
25	5	5	4	3	2	1	76.6
K₁	77.62	82.70	81.58	79.82	80.36	76.16
K₂	80.10	82.30	82.90	81.26	80.92	82.16
K₃	80.50	81.46	83.30	81.44	81.44	81.80
K₄	82.94	80.10	79.46	81.92	85.36	82.70
K₅	85.20	79.78	79.12	81.92	78.28	83.54
R	7.58	2.94	4.18	2.10	7.08	7.38

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Experimental study on hydrodynamic cavitation⁃enhanced carbothermic reduction process for production of magnesium carbonate hydromagnesite

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