钙硅酸盐矿物湿法碳酸化封存二氧化碳实验研究

doi:10.19964/j.issn.1006-4990.2022-0652

Abstract

Abstract:

Wet carbonation of calcium silicate minerals for CO₂ sequestration is a promising carbonsequestration technology.To compare the carbon sequestration effects of different calcium silicate minerals，the effects of temperature，pressure，liquid-solid ratio（mL/g），particle size and mineral additives（NaHCO₃ and NaCl） on CO₂ sequestration by wet carbonation of wollastonite and anorthite were investigated.The results showed that the carbonation products of wollastonite and anorthite were calcite and aragonite，respectively，and the results of the thermogravimetric experiment indicated that the thermostability of calcite was higher than that of aragonite.The carbonation conversion of wollastonite was higher than that of anorthite under all test conditions，and the carbonation conversion of the two minerals was increased with increasing pressure，decreasing particle size，and the addition of NaHCO₃ and NaCl.The maximum carbonation conversions of 83.62% and 16.20% were obtained for wollastonite and anorthite，respectively，with significant differences.The results of Gibbs free energy of dissolution（ΔG_r ） showed that，in the range of 120~210 ℃，the ΔG_r of wollastonite was always lower than that of anorthite，indicating that the rate of dissolution and the spontaneously occurring extent of dissolution reaction of wollastonite were both greater than that of anorthite.It was a key factor affecting the activity of the carbonation reaction for calcium silicate minerals.

Key words: wollastonite, anorthite, wet carbonation, sequestered CO₂, carbon sequestration technology

CLC Number:

TQ127.1

CHANG Chengbing, LIU Shengyu, ZHANG Lei, YANG Zhichao, GUO Jianying, LI Bao. Experimental study on carbon dioxide sequestration by wet carbonation of calcium silicate minerals[J]. Inorganic Chemicals Industry, 2023, 55(9): 57-65.

Figures/Tables 14

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样品编号	原料	溶液组分	温度/ ℃	压力/ MPa	液固比	粒度/ mm
#1	硅灰石/ 钙长石	蒸馏水	120	5	10∶1	0.038~ 0.074
#2			150
#3			180
#4			210
#5	硅灰石/ 钙长石	蒸馏水	150	4	10∶1	0.038~ 0.074
#6				3
#7				2
#8				1
#9	硅灰石/ 钙长石	蒸馏水	150	5	20∶1	0.038~ 0.074
#10	硅灰石/ 钙长石	蒸馏水	150	5	5∶1	0.038~ 0.074
#11	硅灰石/ 钙长石	蒸馏水	150	5	20∶1	<0.038
#12	硅灰石/ 钙长石	0.5 mol/L NaHCO₃	150	5	20∶1	<0.038
#13		0.5 mol/L NaCl
#14		0.5 mol/L NaHCO₃+ 0.5 mol/L NaCl

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Inorganic Acid-Base-Salt Committee of CIESC

Experimental study on carbon dioxide sequestration by wet carbonation of calcium silicate minerals

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