Regular Article

Effects of an inorganic binder on the strength property of cold-bonded pellets

School of metallurgical and ecological engineering, university of science and technology, Beijing 100083, PR China

^* Email: liuzhengjian@ustb.edu.cn

Received: 27 February 2017
Received in final form: 9 May 2017
Accepted: 31 May 2017

Abstract

Binder is a necessary part in cold-bonded pellets, which could enable the pellets to survive in subsequent handling. A new type of silica-alumina oxide inorganic binder was employed in this study. The preparation of pellets was researched and optimized through single factor experiment. The microstructure of pellets was observed by SEM-EDS and OM. A set of different operation parameters, n(H₂O)/n(Na₂O), n(Na₂O)/n(SiO₂) and n(SiO₂)/n(Al₂O₃) during the preparation of binder and the ratio of binder in pellets were investigated and results showed that pellets prepared under a n(H₂O)/n(Na₂O) of 15.5, n(Na₂O)/n(SiO₂) of 0.3 and n(SiO₂)/n(Al₂O₃) of 4.25 were proved to have the optimal strength. With the ratio of binder rose, strength of pellets increased correspondingly, and there were three kinds of existing forms of binder in pellets. Pellets roasted in inert and reducing atmosphere were also studied. Results indicated that the new type of inorganic binder used in this experiment has a great high temperature stability.