Inorganic Chemicals Industry >

2025 , Vol. 57 >Issue 11: 100 - 107

DOI: https://doi.org/10.19964/j.issn.1006-4990.2024-0449

Environment·Health·Safety

Study on crystal structure control of aragonite prepared by CO2 mineralization from carbide slag

  • CHANG Jingang ,
  • GE Yan ,
  • KOU Junjie ,
  • WANG Jiamian ,
  • YANG Zhiyong ,
  • CAI Lihong
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  • 1. GD Power Datong Power Generation Co. ，Ltd. ，Datong 037001，China
    2. Yuanchu Technology（Beijing）Co. ，Ltd. ，Beijing 100020，China
    3. Tsinghua University，Beijing 100084，China

Received date: 2024-08-14

  Online published: 2024-12-22

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Abstract

Carbide slag was usesd as raw material and five different crystal type control agents were added to the carbide slag-NH4Cl-CO2 atmospheric pressure system to finally prepare aragonite calcium carbonate.The effects of control agents on the particle size，whiteness，crystal structure，and morphology of calcium carbonate were systematically studied using instruments such as field emission scanning electron microscopy and X-ray diffraction.And the effects of factors such as Ca2+concentration and the amount of sodium hexametaphosphate（NaPO3）6 added on the mineralization effect and the stability of the mineralization solution were investigated.The data showed that when the Ca2+concentration was 1.05 mol/L，uniformly dispersed vaterite could be obtained.When it was lower than this concentration，the amount of vaterite was increased with the increase of Ca2+concentration.When the concentration was higher than this，with the increase of Ca2+concentration，vaterite was aggregated severely and eventually transformed into calcite.In addition，（NaPO3）6 had a significant impact on the physicochemical properties of calcium carbonate products.Under the conditions of 1 g （NaPO3）6/100g CaCO3 and a Ca2+concentration of 1.05 mol/L，the transformation of aragonite phase calcium carbonate to calcite phase calcium carbonate could be effectively suppressed，and the prepared product could maintain its crystal form as aragonite for a long time.The stable synthesis system of aragonite using（NaPO3）6 as the crystal type control agent opened up new avenues for high value-added utilization of carbide slag and CO2 storage.

Key words： carbide slag; mineralization; vaterite; crystal form; （NaPO3）6

Cite this article

CHANG Jingang , GE Yan , KOU Junjie , WANG Jiamian , YANG Zhiyong , CAI Lihong . Study on crystal structure control of aragonite prepared by CO2 mineralization from carbide slag[J]. Inorganic Chemicals Industry, 2025 , 57(11) : 100 -107 . DOI: 10.19964/j.issn.1006-4990.2024-0449

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