硫酸氢铵焙烧纤蛇纹石短纤维制备纤维状多孔SiO_2  

Preparation of Fibrous Silica Extracted from Short Chrysotile Fibers by Ammonium Bisulfate Calcination Method

作　　者：宋鹏程[1] 彭同江[1,2] 孙红娟[1] 余玉操 鲜海洋[1] 

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010 [2]西南科技大学分析测试中心,四川绵阳621010

出　　处：《非金属矿》2014年第4期16-19,共4页Non-Metallic Mines

基　　金：四川省创新团队项目(14TD0012);四川省科技厅项目(11zs2003);固体废物处理与资源化教育部重点实验开放基金(12zxgk04);西南科技大学研究生创新基金(13ycjj25;14ycx046)

摘　　要：基于纤蛇纹石一维纳米管结构和形态属性,以石棉尾矿中分选的纤蛇纹石短纤维为原料,采用硫酸氢铵与纤蛇纹石短纤维混合焙烧,选择性浸出纤蛇纹石短纤维中主要金属氧化物,制备纤维状多孔SiO2。获取去金属氧化物作用(以氧化镁浸取率表征)最佳浸取条件为:NH4HSO4/MgO摩尔比为2.5,焙烧温度为500℃,焙烧反应时间为1.5 h。结合焙烧过程分析,证明焙烧过程中纤蛇纹石的镁氧八面体片溶解,保留和修饰了硅氧四面体片残骸,最终形成纤维状多孔SiO2。对制备的纤维状多孔SiO2样品进行表征,其中SiO2含量为94.71%,且保持纤维纳米属性。此研究为纤维状多孔SiO2制备提供新的方法。Based on the structure and morphology of one-dimensional nanotube chrysotile. This paper chose short chrysotile fibers separation from chrysotile asbestos tailings as raw material. Fibrious silica has been prepared by ammonium bisulfate mix-roasted selectivity extracting mental oxide in short chrysotile fibers. The optimum parameters（characterization by MgO extract rate ） obtained by separate factor conditional experiments were as follows： the NH4HSO4：MgO molar rate was 2.5, the roasting temperature 500 ℃, the roasting time was 1.5 h. Combined with roasting process, the result indicating that completely dissolution of the brucite octahedral sheets in ch^sotile, and retained and modified Si-O tetrahedral sheet. The XRD show that fibrous silica was porous, chemical composition of fibrious silica was 94.71%, keeping one-dimensional nanotube attribute. This research will provide a new method for preparation of porous silica.

关 键 词：硫酸氢铵 石棉尾矿 纤蛇纹石短纤维 纤维状多孔SiO2 去金属氧化物作用 

分 类 号：TD926.4[矿业工程—选矿] X754[环境科学与工程—环境工程]