高掺量粉煤灰制备轻质高强陶粒  

Preparation of lightweight and high-strength ceramsite from highly doped coal fly ash

作　　者：王莉莎 王艳秀 孙伟[1,2] 王成文 孟祥松 Li-sha WANG;Yan-xiu WANG;Wei SUN;Cheng-wen WANG;Xiang-song MENG(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083 [2]战略含钙矿产资源清洁高效利用湖南省重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第12期3885-3898,共14页中国有色金属学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2020YFC1909202);the Postdoctoral Foundation of China(Nos.BX20200389,2020M672513);the National Natural Science Foundation of China(No.52004343)。

摘　　要：提出一种从粉煤灰中制备高强轻质陶粒的方法,为粉煤灰的贮存和有效利用粉煤灰中SiO_(2)、Al_(2)O_(3)等有用物质提供一种潜在的解决方案。在热力学分析的基础上,结合复杂硅酸盐体系中的矿物转化,对冷却方法、焙烧工艺和原料配方进行改进,设计出高掺量(60%~90%,质量分数)粉煤灰烧结制备轻质高强陶粒的优化方法。在焙烧温度为1200℃、保温时间5 min的条件下,得到密度小于0.93 g/cm^(3)、强度高达1.08 kN的陶粒。用该方法制备的陶粒比强度明显高于市场上随机购买的几种陶粒产品。A method for producing lightweight and high-strength ceramsite from coal fly ash was presented.It provides a potential solution to the problem of coal fly ash stockpiling and makes effective use of SiO_(2),Al_(2)O_(3) and other substances.Based on the thermodynamic analysis,an optimized method for the preparation of lightweight high-strength ceramsite by sintering at high coal fly ash doping(60%-90%,mass fraction)was designed.The mineral transformation in the complex silicate systems was studied.The cooling method,the roasting process and the raw material formula were improved.At the roasting temperature of 1200℃ and the holding time of 5 min,the density of the ceramsite produced was less than 0.93 g/cm^(3) and the strength was as high as 1.08 kN.The specific strength of ceramsite produced by this approach was significantly higher than that of several randomly purchased ceramsite products in the market.

关 键 词：热力学 矿物转型 过程控制 固体废弃物利用 陶粒 粉煤灰 

分 类 号：X705[环境科学与工程—环境工程]