孔结构特性对硅藻土调湿性能的影响  

Effect of Pore Structure on the Humidity Controlling Performance of Diatomite

作　　者：胡志波[1] 郑水林[1] 赵成博[1] 演阳[1] 孙志明[1] 尹胜男[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《非金属矿》2015年第5期17-20,共4页Non-Metallic Mines

基　　金：国家"十二五"科技支撑计划(2011BAB03B07)

摘　　要：以临江选矿硅藻精土为原料,分别在600℃、800℃、1000℃下煅烧2 h,采用静态法在20℃恒温下将未煅烧硅藻土和不同煅烧温度硅藻土置于相对湿度98%和11%的恒湿环境中进行吸放湿试验,采用X射线衍射对调湿样品进行表征,同时采用低温氮吸附法与压汞法测试样品的孔结构特性。结果表明,孔结构特性是影响硅藻土调湿性能的重要因素,微孔和介孔在调湿过程中起主导作用,硅藻土的比表面积越大、微孔和介孔的孔体积越大、孔径越小,则其平衡吸湿量和平衡放湿量越大,调湿性能越强。The Linjiang puriifed diatomite was used as humidity controlling material after calcination processing under the temperature of 600℃, 800℃ and 1000℃ for 2 h. The humidity controlling experiment of uncalcined diatomite and calcined diatomite were conducted by static method under isothermal and constant humidity conditions which the temperature was 20℃ and the relative humidity was 98% and 11%. Meanwhile, the humidity controlling samples were characterized by XRD, and the pore structure characteristic was analyzed by low temperature nitrogen adsorption method and mercury porosimetry. The results indicate that pore structure is signiifcant factor for the humidity controlling performance of diatomite, which is controlled by micropores and mesopores, and the equilibrium value of moisture adsorption and desorption, which relfect humidity controlling performance, increase as surface area increase, pore volume of micropores and mesopores increase and pore size decrease.

关 键 词：硅藻土 煅烧 孔结构 调湿性能 

分 类 号：TQ424.22[化学工程]