煅烧煤矸石添加量对陶粒支撑剂力学性能的影响

Effect of Calcined Coal Gangue Addition on Mechanical Properties of Ceramic Proppant

可燃性气体的开发以及固体废弃物的再利用是响应国家低碳清洁发展、能源战略转型的重要举措。本文采用煅烧处理的煤矸石作为添加剂制备陶瓷颗粒支撑剂,通过调控支撑剂的原料配比,获得力学性能较好的材料,提升材料支撑岩层裂隙的结构强度,实现煤层气的高效开采。结果表明,煅烧煤矸石组分的适量添加可有效提高陶粒支撑剂抗破碎强度,其中42 MPa闭合压力下破碎率最低为3.66%,52 MPa闭合压力下破碎率最低为7.97%。通过观察界面腐蚀后的陶粒支撑剂微观形貌以及分析结构中的元素成分比例,发现材料中α-Fe_(2)O_(3)的均匀分布促进支撑剂中玻璃相的产生,提升了陶粒基体的结构致密性;同时α-Fe_(2)O_(3)晶粒在形核长大的过程中,由于间隙填补作用产生的微观应力对材料结构起到再次强化的效果,显著提升陶粒支撑剂的力学性能以及抗破碎能力。

The exploitation of combustible gas and the recycle of solid waste are important measures to respond the national policy of low-carbon development and energy transformation.In this paper,ceramic particle proppant was synthesized by the solid waste material of calcined coal gangue for realizing the efficient exploitation of coalbed methane.By adjusting the synthetic conditions,the mechanical properties of the material were finally strengthened for the efficient exploitation of coalbed methane.The experimental results show that the proper addition of calcined coal gangue can effectively adjust the anti-crushing strength of ceramic proppant,and the lowest crushing rate is 3.66% at 42 MPa and 7.97% at 52 MPa,respectively.After the interfacial corrosion treatment of ceramic proppant,it is found that the uniform distribution of Fe element is conducive to the generation of molten liquid in proppant and structural densification.Moreover,the microstructural stress generated by the gap filling of the α-Fe_(2)O_(3) particle during the process of grain nucleation and growth.The material structure has been strengthened through the dispersiveα-Fe_(2)O_(3) particle,which significantly improves the mechanical properties and crushing resistance of ceramic proppant.