混合碱熔融活化含钾岩石制备低硅X型分子筛  

Activation of the Potassic Rocks by Mixed Alkali Fusion Method and Synthesis of Low Silica X Zeolite

作　　者：白艳[1] 赵斌[1] 苗青郁 蒙艳蕊 曹吉林[1] 

机构地区：[1]河北工业大学化工学院河北省绿色化工与高效节能重点实验室,天津300130

出　　处：《非金属矿》2016年第6期20-23,53,共5页Non-Metallic Mines

基　　金：河北省自然科学基金(B2013202246);天津市自然科学基金(14JCYBJC19900);福建省教育厅资助项目(JA14076)

摘　　要：采用Na_2CO_3-Na OH混合碱熔融活化含钾岩石制备低硅X型分子筛(LSX)的工艺。考察了分解温度、分解时间、碱矿质量比和Na OH与Na_2CO_3质量比对含钾岩石分解的影响,以及物料摩尔配比n(SiO_2)/n(Al_2O_3)、n(H2O)/n(Na_2O+K_2O)和n(Na_2O)/n(Na_2O+K_2O)对合成分子筛的影响。采用X射线衍射(XRD)、扫描电子显微镜(SEM)对样品进行表征。结果表明,含钾岩石分解为高活性前驱物的适宜条件为分解温度300℃、分解时间3.0 h、碱矿质量比2.5∶1、Na OH与Na_2CO_3质量比1.5∶1,制备LSX分子筛适宜物料摩尔配比为n(SiO_2)/n(Al_2O_3)=2.2,n(Na_2O)/n(Na_2O+K_2O)=0.78,n(H2O)/n(Na_2O+K_2O)=15.32。In this study, the potassic rocks were activated to synthesize low silica X （LSX） zeolite. The effects of activation temperature, activation time, mass ratio of alkali-to-ore and NaOH-to-Na2CO3 on activation of potassic rocks powder, and the effects of molar ratios of n（SiO2）/ n（Al2O3）, n（Na2O）/n（Na2O＋K2O） and n（H20）/n（Na2O＋K2O） on the synthesis of LSX zeolite were investigated. X-ray powder diffraction and scanning electron microscopy were employed to characterize the samples. The results demonstrated that the suitable conditions for activating potassic rocks by Na2CO3-NaOH mixed alkali fusion method to obtain high active precursor were as follows： the activation temperature was 300 ℃, the activation time was 3.0 h, the mass ratio of alkali-to-ore was 2.5 ： 1 and the mass ratio of NaOH-to-Na2CO3 was 1.5 ： 1. The suitable molar ratios for preparation of LSX zeolite using the high active precursor from activation of potassic rocks were n（SiO2）/n（Al2O3）=2.2, n（Na2O）/n（Na2O＋K2O）=0.78 and rt（H2O）/ n（Na2O＋K2O）= 15.32.

关 键 词：含钾岩石 混合碱熔融法 低硅X型分子筛(LSX) 高活性前驱物 

分 类 号：TQ424.25[化学工程]