高压电瓷废料制备低密度高强度陶粒支撑剂及其性能  

Preparation and Properties of Low Density and High Strength Ceramic Proppant from High Voltage Electric Porcelain Waste

作　　者：付鹏程 肖国庆[1] 丁冬海 方宇飞 种小川 朱现峰 FU Pengcheng;XIAO Guoqing;DING Donghai;FANG Yufei;CHONG Xiaochuan;ZHU Xianfeng(College of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Zhengzhou Runbao Refractory Co.,Ltd.,Zhengzhou 452300,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安7100552 [2]郑州市润宝耐火材料有限公司,郑州452300

出　　处：《材料导报》2022年第4期62-66,共5页Materials Reports

基　　金：国家自然科学基金(51572212,51772236);陕西省重点研发计划项目(2018ZDXM-GY-128);陕西省教育厅协同创新项目(Z20200170)。

摘　　要：以高压电瓷废料为原料,通过气流超细粉碎、圆盘造粒,经1180~1260℃烧结制备油气开采水力压裂用陶粒支撑剂。通过X射线衍射(XRD)和扫描电子显微镜(SEM)对不同烧结温度陶粒支撑剂试样的物相组成和微观形貌进行分析,通过石油天然气行业标准中的方法测试试样的密度、破碎率及酸溶解度,研究烧结温度对试样微观结构和性能的影响。结果表明,支撑剂主要物相为莫来石和刚玉,随着烧结温度的升高,针状莫来石晶粒逐渐长大,并互相交错堆叠形成网格状结构,液相均匀分散并包裹于晶粒,使试样致密化程度提高。但烧结温度过高会导致试样内二次莫来石化程度变高,部分莫来石晶粒异常长大,使支撑剂整体表现出高的空隙率,影响试样强度。试样在1220℃表现出最高视密度和最低破碎率,在69 MPa闭合压力下其破碎率仅为6.1%、视密度为2.74 g/cm^(3),符合SY/T5108-2014中关于低密度陶粒支撑剂的标准要求。Ceramic proppant for hydraulic fracturing in oil and gas exploitation was prepared from high voltage electric porcelain waste by air flow superfine grinding,disc granulation and sintering at 1180—1260℃.The phase composition and micro morphology of ceramic proppant samples sintered at different temperatures were analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The density,crushing rate and acid solubility of samples were tested by the methods of petroleum and natural gas industry standards,and the effects of sintering temperature on microstructure and properties of samples were studied.The results show that the main phases of proppant are mullite and corundum.With the increase of sintering temperature,the acicular mullite grains grow up gradually and form a grid structure.The liquid phase is uniformly dispersed and wrapped in the grains,which improves the densification of the sample.However,if the sintering temperature is too high,the degree of secondary mullite in the sample will become higher,and some mullite grains will grow abnormally,resulting in high porosity of proppant and affecting the strength of the sample.The sample shows the highest apparent density and the lowest crushing rate at 1220℃,while the crushing rate is only 6.1%under 69 MPa closing pressure and the apparent density is 2.74 g/cm^(3),which meets the standard requirements of low density ceramic proppant in SY/T5108-2014.

关 键 词：陶粒支撑剂 烧结温度 二次莫来石化 破碎率 

分 类 号：TQ174.75[化学工程—陶瓷工业]