Synergistic mechanism to prepare ultra-lightweight ceramsite using multiple industrial solid wastes

Pei，Jiannan1,2,3,4; Pan，Xiaolin1,2,3; Lv，Zhongyang1,2,3; Yu，Haiyan1,2,3; Tu，Ganfeng1,2,3; Jiang，Feng4

2024-04-26

10.1016/j.conbuildmat.2024.136139

Construction and Building Materials   影响因子和分区

0950-0618

Red mud, fly ash and waste sawdust are bulk solid wastes discharged from the alumina, power and wood processing industries respectively, and their increasing accumulation has brought serious hazards to the ecological environment and huge waste of secondary resources. A novel rapid roasting method was adopted to produce the ultra-lightweight ceramsites (ULC) using red mud, fly ash and waste sawdust in this work, and the various performances, microstructure and formation mechanism of ULC were investigated using FTIR, XRD, BET, SEM-EDS and Micro-CT. The fly ash significantly enhances the compressive strength of ULC by promoting the formation of small pores and FeAlO, and the increase in roasting temperature is beneficial for the expansion of ULC until they are over burning. As the mass ratios of red mud, fly ash, clay and waste sawdust are 46: 10: 36: 8, the ULC with a compressive strength of 2.25 MPa, a bulk density of 465 kg/m and a water absorption of 8.8% are prepared when roasted at 1125 ºC for 5 min after preheating at 600 ºC for 5 min. The environmental assessment results indicates that the ULC are environmentally safe due to the effective solidification of hazardous elements. This study provides a promising way to produce ULC by utilizing industrial solid wastes.

Formation mechanism Morphological structure Rapid roasting Solid wastes Ultra-lightweight ceramsites

SCI ; EI

英语

其他

MATERIALS SCIENCE

2-s2.0-85189508640

Scopus

1.Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education),Northeastern University,Shenyang,China
2.School of Metallurgy,Northeastern University,Shenyang,China
3.Key Laboratory for Recycling of Nonferrous Metal Resources (Shenyang),Shenyang,China
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Pei，Jiannan,Pan，Xiaolin,Lv，Zhongyang,et al. Synergistic mechanism to prepare ultra-lightweight ceramsite using multiple industrial solid wastes[J]. Construction and Building Materials,2024,425.

Pei，Jiannan,Pan，Xiaolin,Lv，Zhongyang,Yu，Haiyan,Tu，Ganfeng,&Jiang，Feng.(2024).Synergistic mechanism to prepare ultra-lightweight ceramsite using multiple industrial solid wastes.Construction and Building Materials,425.

Pei，Jiannan,et al."Synergistic mechanism to prepare ultra-lightweight ceramsite using multiple industrial solid wastes".Construction and Building Materials 425(2024).