摘要
采用磷石膏制备建筑石膏是规模化消纳磷石膏的重要途径。本文研究了粉磨细度对磷石膏制备建筑石膏物相转化速率及硬化体力学强度与结构的影响。研究结果表明:提高煅烧温度有利于加快磷石膏脱水,合适的煅烧温度为120℃。随着粉磨细度的增加,磷石膏转化为建筑石膏的速率先增加后降低,所制备建筑石膏的抗折强度和抗压强度先增大后降低;未经粉磨的磷石膏制备的建筑石膏硬化体结构松散、孔洞较多、粉化严重,抗折强度和抗压强度仅分别为0.24 MPa和0.57 MPa;当磷石膏平均粒径减小到49.95μm时,磷石膏脱水速率加快,水化生成的二水石膏晶体粒度均匀,硬化体结构致密、孔洞较少,抗折强度和抗压强度分别提高至1.02 MPa和2.62 MPa。因此,通过粉磨改性不仅有利于提高磷石膏的脱水速率,还能有效改善石膏硬化体的结构,提高建筑石膏的力学强度。
Preparation of calcined phosphogypsum(CPG)is an important utilization way for phosphogypsum(PG)on a large scale.In this paper,the effects of grinding fineness on the phase transformation rate,mechanical strength and structure of hardened body of the CPG were studied.The results show that increasing calcination temperature is beneficial to accelerating the dehydration of PG,the appropriate calcination temperature is 120℃.With the increase of grinding fineness,the conversion rate of PG into CPG first increases and then decreases;the flexural strength and compressive strength of the prepared CPG first increase and then decrease;the hardened body of the CPG prepared from non-grinding PG has loose structure,many holes and serious pulverization,and the flexural strength and compressive strength are only 0.24 MPa and 0.57 MPa,respectively.When the average particle size of PG is reduced to49.95μm,the dehydration rate is accelerated,the crystal size of dihydrate gypsum is uniform,the hardened structure is dense,and the pores are less,the flexural strength and compressive strength are increased to1.02 MPa and 2.62 MPa,respectively.Therefore,grinding modification is not only beneficial to increasing the dehydration rate of PG,but also to effectively improving the structure of hardened gypsum and increasing the mechanical strength of CPG.
作者
何芋崎
李显波
杜亚文
李明露
陈光超
张云鹏
He Yuqi;Li Xianbo;Du Yawen;Li Minglu;Chen Guangchao;Zhang Yunpeng(Mining College,Guizhou University,Guiyang,Guizhou,China;National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas,Guizhou University,Guiyang,Guizhou,China;Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources,Guizhou University,Guiyang,Guizhou,China)
出处
《矿产综合利用》
CAS
北大核心
2022年第6期36-41,共6页
Multipurpose Utilization of Mineral Resources
基金
贵州大学“SRT计划”项目(贵大SRT字(2019)219号)
贵州大学引进人才科研项目(贵大人基合字(2019)41号)
贵州省教育厅青年科技人才成长项目(黔教合KY字[2021]099)。
关键词
磷石膏
粉磨细度
转化速率
力学强度
硬化体结构
Phosphogypsum
Grinding fineness
Transformation rate
Mechanical strength
Structure of hardened body
作者简介
何芋崎(1996-),男,硕士研究生,主要研究方向为难选矿石的选矿及资源综合利用;通信作者:李显波(1990-),男,博士,硕士研究生导师,主要研究方向为难选矿石的选矿及资源综合利用。
