二水硫酸钙间接矿化二氧化碳CTAB对碳酸钙晶型的影响

doi:10.11962/1006-4990.2019-0224

Abstract

Abstract:

Increasing the added value of products is of great significance for improving the economy of CO₂ mineralization process.In the indirect mineralization process of calcium sulfate dihydrate and ammonium carbonate solution,cetyltrimethy-lammonium bromide（CTAB） was used as the crystal regulator to obtain calcium carbonate composed of vaterite crystal form. The effects of reaction time,reaction temperature and the dosage of CTAB on the crystal and morphology of calcium carbonate were studied systematically.The crystal and morphology were characterized by XRD,SEM and FT-IR.The results showed that the reaction process begined with the formation of metastable phase vaterite which continued to convert to calcite with the highest thermodynamic stability.The addition of CTAB can significantly enhance the stability of vaterite; lower temperature was beneficial to form vaterite;when the reaction temperature was 30 ℃,CaSO₄·2H₂O solid powder and（NH₄）₂CO₃ solution were both 0.01 mol/L and CTAB was 0.54 mmol/L,the proportion of vaterite in the product was higher than 80%.The adsorption of CTAB on the product surface reduced the surface energy and inhibited the conversion of vaterite to calcite.

Key words: CaSO₄·2H₂O, （NH₄）₂CO₃, CTAB, calcium carbonate

CLC Number:

TQ132.32

Wang Gang,Tang Shengwei,Chen Yanxiao,Zhang Tao. Effect of CTAB on crystal form of CaCO₃ in indirect mineralization of CO₂ by CaSO₄·2H₂O[J]. Inorganic Chemicals Industry, 2020, 52(3): 75-79.

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References 15

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t/min	X_v/%	X_c/%	t/min	X_v/%	X_c/%
5	74.21	25.79	20	38.76	61.24
10	67.31	32.69	30	31.30	68.70

T/℃	X_v/%	X_c/%	T/℃	X_v/%	X_c/%
10	89.07	10.93	40	0.00	100.00
20	88.55	11.45	50	0.00	100.00
30	31.30	68.70

c（CTAB）/ （mmol·L^-1）	X_v /%	X_c /%	c（CTAB）/ （mmol·L^-1）	X_v /%	X_c /%
0.00	25.33	74.67	0.81	69.05	30.95
0.27	31.30	68.70	1.08	57.34	42.66
0.54	81.94	18.06

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Effect of CTAB on crystal form of CaCO₃ in indirect mineralization of CO₂ by CaSO₄·2H₂O

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