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Experimental study on hydrodynamic cavitation⁃enhanced carbothermic reduction process for production of magnesium carbonate hydromagnesite
Received date: 2023-11-08
Online published: 2024-08-01
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.
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 . DOI: 10.19964/j.issn.1006-4990.2023-0529
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