亚熔盐活化含钾岩石制备球形羟基钙霞石  

Preparation of spherical hydroxycancrinite from potassic rocks activated by sub-molten salt

作　　者：刘存 李雲 郭宏飞[1] 曹吉林[1] LIU Cun;LI Yun;GUO Hongfei;CAO Jilin(Engineering Research Center of Seawater Utilization Technology of Ministry of Education,School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]教育部海水资源高效利用化工技术工程研究中心,河北工业大学化工学院,天津300401

出　　处：《高校化学工程学报》2023年第4期623-632,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(22008049);河北省自然科学基金(B2018202330,B2020202081);中国科学院天然气水合物重点实验室(中国科学院广州能源研究所)资助(E029kf1601)。

摘　　要：为资源化利用含钾岩石,以亚熔盐活化后的含钾岩石为原料,通过水热反应成功制备球形羟基钙霞石。考察了水热反应温度、H_(2)O与K_(2)O物质的量比n(H_(2)O)/n(K_(2)O)及反应时间对合成球形羟基钙霞石的影响。实验结果表明,水热反应的适宜条件为:反应温度为150℃,n(H_(2)O)/n(K_(2)O)为38.62,反应时间为12 h。活化后的含钾岩石在水热反应时先形成羟基方钠石,然后在K+的盐析作用下转化为球形羟基钙霞石。合成羟基钙霞石的滤液制备水合硅酸钙后,可循环利用再次对含钾岩石进行分解。对羟基钙霞石进行Cu(Ⅱ)吸附试验,最大吸附量为51.76 mg·g^(−1)。Cu(Ⅱ)在羟基钙霞石上的吸附动力学符合伪二阶动力学模型,等温吸附符合Langmuir模型。The spherical hydroxycancrinite was successfully prepared by hydrothermal reaction from potassic rocks activated by sub-molten salt method for utilizing potassic rocks as raw materials.The effects of hydrothermal reaction temperature,n(H_(2)O)/n(K_(2)O)ratio and reaction time on the synthesis of spherical hydroxycancrinite were investigated.The experimental results show that the suitable conditions for the hydrothermal reaction are reaction temperature of 150℃,n(H_(2)O)/n(K_(2)O)of 38.62,and reaction time of 12 h.The hydroxysodalite is firstly formed from the activated potassic rocks during hydrothermal reaction,and then transformed to the spherical hydroxycancrinite under the salting-out effect of K+.The filtrate from the synthesis of hydroxycancrinite could be recycled to decompose potassic rocks after preparing calcium silicate hydrate.Cu(Ⅱ)adsorption on the synthesized hydroxycancrinite was carried out,and the maximum adsorption capacity was 51.76 mg·g^(−1).The adsorption kinetics of Cu(Ⅱ)on hydroxycancrinite conformed to the pseudo-second-order model,and the isothermal adsorption fitted into the Langmuir model.

关 键 词：含钾岩石 亚熔盐法 水热反应 球形羟基钙霞石 Cu(Ⅱ)吸附 

分 类 号：TQ424.25[化学工程]