用旋转反应器合成纳米碳酸钙的研究

Presparation of Nanometer Calcium Carbonate by Rotating Reaction Bed

以自行研制的打孔碟片为填料,利用pH计及电导率仪确定氢氧化钙在旋转反应器中的碳化时间,用超滤膜分离氢氧化钙与碳酸钙;探讨了气体浓度、转速、分散剂等操作条件对碳化过程的影响,结果表明:氢氧化钙与二氧化碳反应生成纳米碳酸钙的过程中,气体浓度、转速、分散剂影响反应时间、产品粒度及粒度分布;利用旋转反应器制备出平均体积当量直径为30-40cm,粒度分布很窄的菱形纳米碳酸钙,而且在碳化过程中,碳酸钙不易在碟片填料中结垢。

As the self-researched bore disc for the filler,the lime of the carbonization of Ca (OH)2 is fixed with FH and electric conductivity rale in the revolving reactor,and the Ca(OH)2 and CaCO3 are separated with the filter.lt inquires into the conditions of operation such as the thick degree of air.rolalion speed and scatter that influence carbonization process.The result indicates that in the process lhal the Ca(OH)2 and CO2 read into the nonocrystal CaCO3,and that The densily of air, rotational speed and scalier influence the reaction time,the size of production and the distribution of it.By the revolving reactor, the narrowly-distributed rhomb nonocryslal CaCO3 with average physical volume and diameter of 30-40nm and in the process of carbonization, the CaCO3 is not easily stained in the disc filler.