水力空化强化碳化反应制备碱式碳酸镁的实验研究  

Experimental study on hydrodynamic cavitationenhanced carbothermic reduction process for production of magnesium carbonate hydromagnesite

作　　者：杨涵硕 王德喜 于红蕾 杨亚丽 姜久闯 YANG Hanshuo;WANG Dexi;YU Honglei;YANG Yali;JIANG Jiuchuang(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China;College of Chemical Engineering and Equipment,Shenyang University of Technology,Liaoyang 111000,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870 [2]沈阳工业大学化工装备学院,辽宁辽阳111000

出　　处：《无机盐工业》2024年第7期74-79,共6页Inorganic Chemicals Industry

摘　　要：为了强化微观混合和传质,提高Mg(OH)_(2)碳化率,采用水力空化技术强化Mg(OH)_(2)与CO_(2)碳化反应生成中间产物Mg(HCO_(3))_(2),再经过热解制备碱式碳酸镁[4Mg CO_(3)·Mg(OH)_(2)·4H_(2)O],设计正交试验考察Mg(OH)_(2)碳化率的影响因素。通过扫描电子显微镜、X射线衍射仪和多参数测试仪等对产物进行表征。研究结果表明,Mg(OH)_(2)碳化率影响因素由大到小顺序依次为入射角α、CO_(2)流量q、Mg(OH)_(2)固含量s、入口压力p、喉径d_(0)、碳化时间t。在α=60°、d_(0)=4 mm、p=0.35 MPa、t=60 min、s=1.6%、q=17 L/min的工艺条件下碳化率为92.1%,比鼓泡搅拌反应器的碳化率(60.53%)高31.57%。产物4Mg CO_(3)·Mg(OH)_(2)·4H_(2)O中杂质(如Ca O、Fe)含量降低;制备的4Mg CO_(3)·Mg(OH)_(2)·4H_(2)O呈均匀片状结构,晶体厚度小于50 nm;产品结晶良好,组成相对稳定单一,所得产物的各个衍射峰峰位都与标准六方晶型的碱式碳酸镁衍射峰峰位完全一致。In order to enhance microscopic mixing and mass transfer and to increase the Mg(OH)_(2) carbonation rate,hydrodynamic cavitation technology was employed to intensify the carbonation reaction of Mg(OH)_(2) and CO_(2) to produce the intermediate product Mg(HCO_(3))_(2),which was then pyrolyzed to produce basic magnesium carbonate[4MgCO_(3)·Mg(OH)_(2)·4H_(2)O].An orthogonal experimental design was used to investigate the factors influencing the carbonation rate of Mg(OH)_(2).The resulting products were characterized by using scanning electron microscopy,X-ray diffractometer,and a multi-parameter testing instrument.The results showed that the important order of factors affecting the Mg(OH)_(2) carbonation rate was incident angleα>CO_(2) flow rate q>Mg(OH)_(2) solid content s>inlet pressure p>throat diameter d_(0)>carbonation time t.Under the process conditions ofα=60°,d_(0)=4 mm,p=0.35 MPa,t=60 min,s=1.6%,and q=17 L/min,the carbonation rate reached 92.1%.It was a 31.57%improvement over the carbonation rate(60.53%)of a bubblestirred reactor.The content of impurities such as CaO and Fe in the product 4MgCO_(3)·Mg(OH)_(2)·4H_(2)O was reduced,and the produced 4MgCO_(3)·Mg(OH)_(2)·4H_(2)O had a uniform flake structure with a crystal thickness of less than 50 nm.The product had good crystallization and relatively stable and single composition.Each diffraction peak position of the obtained product was completely consistent with the diffraction peak position of basic magnesium carbonate in the standard hexagonal crystal form.

关 键 词：水力空化 碳化反应 碱式碳酸镁 水力空化反应器 

分 类 号：TQ132.2[化学工程—无机化工]