摘要
以低品位CLK6-62型铝矾土为主要原料,采用无压煅烧技术制备了铬铁矿掺杂的铝矾土基石油压裂支撑剂,并系统考察了铬铁矿添加量对试样物相、微结构及性能的影响。分析表明,铬铁矿掺杂有效促进了铬刚玉相和棒状莫来石相的发育,从而获得了具有双重增强机制的高强度试样。其中,铬铁矿添加量为2wt%时,试样烧结温度可降低60℃(从1480℃到1420℃),并且其在69 MPa闭合压力下的破碎率仅为1.8%(未掺杂试样:5.1%)。该工艺采用低品位矿物原料及现有设备,所制备支撑剂性能高于相应标准要求,具有较好的推广前景。
High-strength fracturing proppant was prepared by pressureless sintering process using bauxite （67wt% Al2O3） and chromite as raw materials. The influence of chromite content （0-Swt%） on phase composition, microstructure and breakage ratio were studied by XRD, SEM, EDS and the column compression method, respectively. The results indicate that the additive of chromite promotes the formation of solid solution of chrome-corundum （Al2-2x Cr2x O3,0〈x〈 1）and rod-shape mullite phases, both of which are believed to strengthen the fracturing proppant. Additionally, liquid phase is formed by excessive ferrum located between the ceramic grains at relatively high sintering temperatures, which is impor- tant for accelerating the sintering densification. The sintering temperature decreases with the addition of chromite. The optimized proppant sample with 2wt% chromite doped, sintered at 1420 ℃ for 2 h shows a breakage ratio of only 1.8% under the pressure of 69 MPa. Furthermore, 2 wt% chromite doping decreases the sintering temperature by 60 ℃ （from 1480 ℃ to 1420 ℃）. This process enables the production of high-strength fracturing proppant from low-rank mineral materials and demonstrates a promising practical application.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第9期1019-1024,共6页
Journal of Inorganic Materials
基金
煤转化国家重点实验室开放基金(09-102)
全国博士后基金(2012M52060)
太原理工大学2012年校专项/青年基金(2012L052)~~
