利用菱镁尾矿制备硫氧镁水泥的研究  

Preparation of sulfur oxide magnesium cement with magnesium tailings

作　　者：杨李驰 张志远[3] 涂平涛 朱信雄 周俊波[1] 杨剑锋[1] 高丽萍[4] YANG Li-chi;ZHANG Zhi-yuan;TU Ping-tao;ZHU Xin-xiong;ZHOU Jun-bo;YANG Jian-feng;GAO Li-ping(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;China Scientific Magnesium(Beijing)Technology Co.,Ltd.,Beijing 100032,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;College of Biochemical Engineering of Beijing Union University,Beijing 100023,China)

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]中科镁基(北京)科技有限公司,北京100032 [3]中国科学院生态环境研究中心,北京100085 [4]北京联合大学生物化工学院,北京100023

出　　处：《应用化工》2022年第8期2187-2193,共7页Applied Chemical Industry

基　　金：国家自然科学基金项目资助(52170144)。

摘　　要：菱镁尾矿分别通过焙烧和再生酸浸泡,制备轻烧MgO和MgSO_(4)混合物,利用轻烧MgO和MgSO_(4)混合物制备硫氧镁水泥。结果表明,最佳条件下(900℃,煅烧时间2 h),氧化镁活性可达61.94%;最佳条件下(酸矿比1∶2.2,酸浓度20%,酸浸48 h),硫酸镁含量可达17.1%。利用轻烧MgO和MgSO_(4)混合物制备硫氧镁水泥,MgO与MgSO_(4)摩尔比为9,改性剂掺量为2%时,试样养护28 d抗折、抗压强度可分别达10.57,47.71 MPa,软化系数为0.94。The mixture of lightly burned MgO and MgSO_(4)was prepared by roasting magnesite tailings and industrial waste acid leaching respectively.Then,the mixture of lightly burned MgO and MgSO_(4)was used to prepare magnesite oxysulfate cement.The results show that under the best conditions(900℃,calcination time 2 h),magnesium oxide activity could reach 61.94%.Under the best conditions(acid/mine 1∶2.2,acid concentration 20%,acid leaching 48 h),magnesium sulfate content can reach 17.1%,the molar ratio is 9 and the modifier content is 2%,the flexural strength and compressive strength of the sample can reach 10.57 MPa and 47.71 MPa,respectively,and the softening coefficient is 0.94 after curing for 28 d.

关 键 词：菱镁尾矿 煅烧 酸浸 氧化镁活性 MgSO_(4)混合物 硫氧镁水泥 

分 类 号：TQ437[化学工程] TQ430.9[环境科学与工程—环境工程] X753