电石渣矿化CO2制备球霰石型碳酸钙及其晶型控制研究

doi:10.19964/j.issn.1006-4990.2024-0449

Abstract

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

CLC Number:

X781

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.

Figures/Tables 9

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References 28

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序号	晶型控制剂	产品白度	粒径D₁₀/μm	粒径D₅₀/μm	粒径D₉₀/μm	粒径D₉₇/μm
a	未添加	97.52	2.28	14.39	27.10	33.30
b	（NaPO₃）₆	98.78	1.35	5.99	15.09	21.48
c	蔗糖	98.51	2.36	9.39	18.32	23.47
d	纳米碳酸钙	98.73	1.20	6.12	16.92	22.26
e	EDTA	97.79	3.97	17.01	30.08	37.05
f	Na₅P₃O₁₀	97.68	2.03	10.73	23.31	30.42

添加剂	球霰石X_v/%	方解石X_c/%
空白	75.20	24.80
EDTA	57.17	42.83
（NaPO₃）₆	100.00	0
纳米碳酸钙	64.72	35.28
Na₅P₃O₁₀	97.86	2.14
蔗糖	91.72	8.28

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Inorganic Acid-Base-Salt Committee of CIESC

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

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