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,CH_(3)COOH和H_(2)O_(2)为浸出剂提取钙离子的方法。考察了不同CH_(3)COOH浓度、H_(2)O_(2)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、CH_(3)COOH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/LH_(2)O_(2)的条件下浸出率提高了11.68%。添加H_(2)O_(2)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。CH_(3)COOH/H_(2)O_(2)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CH_(3)COOH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。
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 CH_(3)COOH and H_(2)O_(2) as leaching agents.The effects of different concentrations of CH_(3)COOH,H_(2)O_(2),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,CH_(3)COOH 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 H_(2)O_(2).Adding H_(2)O_(2) 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 CH 3 COOH/H 2 O_(2) system was controlled by mixing,and the calculated apparent activation energy was 7.19 kJ/mol,which was lower than the activation energy of leaching reaction under CH 3 COOH system.This study could provide technical reference and theoretical support for indirectly mineralizing carbon sequestration to enhance Ca 2+leaching rate.
作者
郑钦升
张朝晖
邢相栋
折媛
李嘉雨
ZHENG Qinsheng;ZHANG Chaohui;XING Xiangdong;SHE Yuan;LI Jiayu(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China;Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan 735100,Gansu,China;Special Steel Co.,Xining 810000,Qinghai,China)
出处
《化工进展》
2025年第9期5471-5478,共8页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(52174325)
陕西省创新能力支撑计划(2023-CX-TD-53)
陕西省教育厅重点实验室科学研究计划(20JS072)。
关键词
间接矿化
乙酸
过氧化氢
二氧化碳
钢渣
indirect mineralization
CH_(3)COOH
H_(2)O_(2)
CO_(2)
steel slag
作者简介
第一作者:郑钦升(2000-),男,硕士研究生,研究方向为冶金环保与资源利用。E-mail:2204211102@xauat.edu.cn;通信作者:折媛,副教授,研究方向为冶金环保与资源利用。E-mail:sheyuan@xauat.edu.cn。
