Inorganic Chemicals Industry >

2023 , Vol. 55 >Issue 7: 103 - 108

DOI: https://doi.org/10.19964/j.issn.1006-4990.2022-0563

Environment·Health·Safety

Study on preparation of needle-like shaped CaCO3 from calcium carbide slag

  • ZHANG Jinjun ,
  • GUO Linlin ,
  • LIU Bojing ,
  • FENG Shuang ,
  • SHI Qi
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  • College of Chemistry and Chemical Engineering，Cangzhou normal university，Cangzhou 061001，China

Received date: 2022-09-19

  Online published: 2023-07-13

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Abstract

In order to make full use of the carbide slag generated in the production of acetylene gas and realize the resource utilization of solid waste，the needle-like calcium carbonate was prepared from carbide slag by leaching with ammonia chloride solution and NH4HCO3 as carbonizing agent.The effects of reaction temperature，dropping mode，dropping speed，the ratio of ammonia and carbonization-agent and calcium ion on the shape of the calcium carbonate were studied.The results showed that the needle shaped calcium carbonate was prepared when the reaction temperature was 80 ℃，n（NH3·H2O）:n（HCO3-）:n（Ca2+）=2:2:1，calcium ion was added to bicarbonate radical solution at the rate of 1 mL/min，and the reaction time was 30 min.The aspect ratio of the product was 8.322 6 and the particle size（D50） was 4.200 μm.The purity of calcium carbonate was 97.20%.Without crystal shape control agent，needle-like calcium carbonate was achieved by adjusting process parameters，which provided reference for the practical application of preparing needle-like CaCO3 from carbide slag in terms of reducing raw material cost and reducing environmental pollution in the future.

Key words： carbide slag; calcium carbonate; needle-like

Cite this article

ZHANG Jinjun , GUO Linlin , LIU Bojing , FENG Shuang , SHI Qi . Study on preparation of needle-like shaped CaCO3 from calcium carbide slag[J]. Inorganic Chemicals Industry, 2023 , 55(7) : 103 -108 . DOI: 10.19964/j.issn.1006-4990.2022-0563

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