CAJ | 학술논문

以2种不同的拟薄水铝石(PB)和海藻酸钠(ALG)为原料，采用海藻酸辅助溶胶-凝胶法制备γ-Al2O3颗粒。用氮气吸附-脱附、强度测定仪、XRD、SEM、XRF 对样品进行表征；考察了2种拟薄水铝石的胶溶指数；研究了不同拟薄水铝石配比及胶溶剂硝酸处理时间对氧化铝颗粒物化性质的影响。结果表明：拟薄水铝石的胶溶指数是影响颗粒强度的重要因素；采用不同的拟薄水铝石进行配比，可调控氧化铝颗粒的孔结构及强度；随着硝酸处理时间的延长，氧化铝颗粒的比表面积、孔容和孔径逐渐降低，钙含量也随之降低，但颗粒的强度随着处理时间的延长而增大，并在15,min 时达到最大值104,N，继续延长处理时间强度出现一定程度的降低；硝酸处理过程改变了拟薄水铝石粒子的大小和堆积方式，并没有改变γ-Al2O3的物相结构。
이2충불동적의박수려석(PB)화해조산납(ALG)위원료，채용해조산보조용효-응효법제비γ-Al2O3과립。용담기흡부-탈부、강도측정의、XRD、SEM、XRF 대양품진행표정；고찰료2충의박수려석적효용지수；연구료불동의박수려석배비급효용제초산처리시간대양화려과립물화성질적영향。결과표명：의박수려석적효용지수시영향과립강도적중요인소；채용불동적의박수려석진행배비，가조공양화려과립적공결구급강도；수착초산처리시간적연장，양화려과립적비표면적、공용화공경축점강저，개함량야수지강저，단과립적강도수착처리시간적연장이증대，병재15,min 시체도최대치104,N，계속연장처리시간강도출현일정정도적강저；초산처리과정개변료의박수려석입자적대소화퇴적방식，병몰유개변γ-Al2O3적물상결구。
Sphericalγ-alumina granules were prepared by alginate assisted sol-gel method using two different types of pseudoboehmite(PB)and sodium alginate(ALG)as raw materials. The samples were characterized by N2 adsorption-desorption,tensile tester,XRD,SEM and XRF. Dispersion indexs of two PB samples were investigated;the in-fluence of the ratio of two different PBs and the treating time of nitric acid on the properties of sphericalγ-alumina was studied. Results indicate that the crushing strength of γ-alumina is influenced by dispersion index of PB;regulable pore structure and crushing strength of alumina granules can be obtained by changing the mass ratio of two different PBs. The surface area,pore volume,pore size and calcium contents decrease with the increase of treating time of nitric acid while crushing strength of the sample is increased to about 104,N after 15,min and is decreased by continuing to prolong the treating time;pore size and packing mode of PB is changed by the nitric acid treating proc-ess,but the phase structure ofγ-Al2O3 is not changed.