铝矾土空心陶粒支撑剂的制备及性能研究

以尿素为成孔模板,MnO2为烧结助剂,铝矾土粉为球壳包覆材料,采用模板法制备了空心内半径可控的铝矾土空心陶粒支撑剂.运用X射线荧光分析,热分析、XRD和SEM等技术对铝矾土原料粉预处理前后矿物相组成和化学成分及支撑剂产品微观形貌的变化进行了比较分析,探究了原料预处理对支撑剂结构和性能的影响,并对其影响机理进行了分析.结果表明:原料粉体经预处理后可提高支撑剂的强度.在1440 ℃烧结后的主要物相为莫来石相和刚玉相.利用预处理后的铝矾土粉体制备出的空心支撑剂的体积密度为1.35 g·cm-3,视密度2.47 g·cm-3,25 MPa闭合压力破碎率为5.21;,单粒抗压平均值为58 N,试样质量稳定,制备过程较易控制.

Preparation and Performance of the Hollow Bauxite Ceramic Proppant

In the present study, the hollow bauxite proppant with controlled inner-hollow structure was prepared by templates method with the urea and MnO2 as well as the bauxite powder used as pore forming template, sintering additives and spherical shell coating material, respectively.The change of the mineral facies composition and chemical component of the raw material before and after vsintering were analysed by X-ray fluorescence, the TG-DSC, XRD and SEM.The SEM was used to observe the variation in microtopography of the ceramic proppant.The influence of pretreatment on the microstructure and properties of the as-received hollow bauxite proppant was investigated,and the influence mechanism is analyzed.The results show that the pretreatment of calcining the raw material powder contributed to improve the strength of proppant.After sinter at 1440 ℃, the main phase constitution of the as-prepared sample is mullite phase and corundum phase.Meanwhile, the volume density of the hollow proppant manufactured by lightly calcined bauxice is 1.35 g·cm-3, the apparent density is 2.47 g·cm-3, the breakage rate is 5.21% at the closure pressure of 25 MPa, and the average value of the compression resistance for single grain is 58 N.The sample quality is stable and the productive process is easily controlled.