Leaching mechanism of calcium components in steel slag under CH3COOH/H2O2 leaching system

doi:10.16085/j.issn.1000-6613.2024-1257

Abstract

Abstract:

To solve the problem of low calcium ion leaching rate in indirect mineralization, a systematic study was conducted on the method of extracting calcium ions using steel slag as raw material and CH₃COOH and H₂O₂ as leaching agents. The effects of different concentrations of CH₃COOH, H₂O₂, reaction temperature, and reaction time on leaching efficiency were examined. Using X-ray diffraction (XRD), scanning electron microscopy (SEM-EDS), and zeta potential analyzer, the reaction products were characterized, and with the help of reaction kinetics models, the limiting links of the reaction were identified to reveal the leaching reaction mechanism. The results showed that under the conditions of leaching temperature of 25℃, solid-liquid ratio of 1∶10, CH₃COOH concentration of 0.75mol/L, and leaching time of 40min, the leaching rate of calcium ions was 49.56%. The leaching rate increased by 11.68% under the condition of adding 3mol/L H₂O₂. Adding H₂O₂ can effectively reduce the silica gel attached to the surface of steel slag during the leaching process, thereby improving the leaching efficiency of the reaction. The leaching reaction of calcium ions in steel slag under CH₃COOH/H₂O₂ system was controlled by mixing, and the calculated apparent activation energy was 7.19kJ/mol, which was lower than the activation energy of leaching reaction under CH₃COOH system. This study could provide technical reference and theoretical support for indirectly mineralizing carbon sequestration to enhance Ca²⁺ leaching rate.

Key words: indirect mineralization, CH₃COOH, H₂O₂, CO₂, steel slag

摘要：

针对间接矿化所存在的钙离子浸出率低的问题，系统研究了以钢渣为原料，CH₃COOH和H₂O₂为浸出剂提取钙离子的方法。考察了不同CH₃COOH浓度、H₂O₂浓度、反应温度、反应时间对浸出效果的影响。利用X射线衍射仪（XRD）、扫描电子显微镜（SEM-EDS）、zeta电位分析仪对反应产物进行表征，并借助反应动力学模型找到反应的限制性环节，从而揭示出浸出反应机理。结果表明，在浸出温度为25℃、固液比为1∶10、CH₃COOH浓度为0.75mol/L、浸出时间为40min的条件下，钙离子的浸出率为49.56%，在添加3mol/L H₂O₂的条件下浸出率提高了11.68%。添加H₂O₂能够有效减少浸出过程中附着在钢渣表面的硅胶，从而提升反应的浸出效率。CH₃COOH/H₂O₂体系下钢渣中钙离子的浸出反应受混合控制，计算得到表观活化能为7.19kJ/mol，低于CH₃COOH体系下浸出反应的活化能。本文可为间接矿化固碳提升Ca²⁺浸出率提供技术参考与理论支持。

关键词: 间接矿化, 乙酸, 过氧化氢, 二氧化碳, 钢渣

CLC Number:

X757

ZHENG Qinsheng, ZHANG Chaohui, XING Xiangdong, SHE Yuan, LI Jiayu. Leaching mechanism of calcium components in steel slag under CH₃COOH/H₂O₂ leaching system[J]. Chemical Industry and Engineering Progress, 2025, 44(9): 5471-5478.

郑钦升, 张朝晖, 邢相栋, 折媛, 李嘉雨. CH₃COOH/H₂O₂浸取体系下钢渣钙组分浸出机制[J]. 化工进展, 2025, 44(9): 5471-5478.

Figures/Tables 12

References 35

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元素	质量分数/%
Ca	39.66
Si	9.14
Mg	3.44
Fe	15.17
Al	2.83
Mn	0.71
P	0.29

元素	质量分数/%
Ca	39.66
Si	9.14
Mg	3.44
Fe	15.17
Al	2.83
Mn	0.71
P	0.29

浸出条件	温度/℃	化学反应控制		固体产物层控制		混合控制		富硅层控制
浸出条件	温度/℃	k₁	R₁²	k₂	R₂²	k₃	R₃²	k₄	R₄²
CH₃COOH体系	25	0.0195	0.8456	0.0035	0.9256	0.0051	0.9354	0.0065	0.9926
	35	0.0245	0.8759	0.0054	0.9189	0.0064	0.9254	0.0071	0.9943
	45	0.0294	0.8412	0.0065	0.9354	0.0078	0.9268	0.0078	0.9946
	55	0.0354	0.9014	0.0072	0.9215	0.0094	0.9121	0.0083	0.9927
CH₃COOH/H₂O₂体系	25	0.0214	0.8062	0.0057	0.9272	0.0068	0.9939	0.0071	0.9314
	35	0.0302	0.8848	0.0071	0.9440	0.0080	0.9903	0.0079	0.9216
	45	0.0384	0.8755	0.0076	0.9585	0.0092	0.9955	0.0085	0.9316
	55	0.0405	0.8956	0.0081	0.9451	0.0105	0.9941	0.0089	0.8921

浸出条件	温度/℃	化学反应控制		固体产物层控制		混合控制		富硅层控制
浸出条件	温度/℃	k₁	R₁²	k₂	R₂²	k₃	R₃²	k₄	R₄²
CH₃COOH体系	25	0.0195	0.8456	0.0035	0.9256	0.0051	0.9354	0.0065	0.9926
	35	0.0245	0.8759	0.0054	0.9189	0.0064	0.9254	0.0071	0.9943
	45	0.0294	0.8412	0.0065	0.9354	0.0078	0.9268	0.0078	0.9946
	55	0.0354	0.9014	0.0072	0.9215	0.0094	0.9121	0.0083	0.9927
CH₃COOH/H₂O₂体系	25	0.0214	0.8062	0.0057	0.9272	0.0068	0.9939	0.0071	0.9314
	35	0.0302	0.8848	0.0071	0.9440	0.0080	0.9903	0.0079	0.9216
	45	0.0384	0.8755	0.0076	0.9585	0.0092	0.9955	0.0085	0.9316
	55	0.0405	0.8956	0.0081	0.9451	0.0105	0.9941	0.0089	0.8921

Leaching mechanism of calcium components in steel slag under CH₃COOH/H₂O₂ leaching system

CH₃COOH/H₂O₂浸取体系下钢渣钙组分浸出机制

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