The mechanism and preparation of nano-SnO2@fly ash antistatic composite powder

• Published in: Powder technology Vol. 430; p. 119003
• Main Authors: Zhao, Chunxue, Wang, Caili, Qiu, Ying, Wang, Zhixue, Yao, Guoxin, Yang, Runquan
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2023
• Subjects: Antistatic mechanism; Fly ash; Surface coating mechanism; Tin dioxide; Volume resistivity; Fly ash; Antistatic mechanism; Tin dioxide; Surface coating mechanism; Volume resistivity
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2023.119003

In order to solve the problems of poor antistatic property of fly ash (FA), high cost and easy agglomeration of nano tin dioxide (TO), chemical co-precipitation method was adopted to synthesize nano-SnO2@fly ash (shell@core, TOFA) antistatic composite powder. Volume resistivity was used as indicator of TOFA antistatic performance to be experimentally studied. The results showed that volume resistivity was reduced from 7.32 × 109 Ω·cm (FA) to 1.82 × 105 Ω·cm (TOFA). Under pH = 4 condition, the electrostatic attraction between TO precursor and FA didn't significantly improve agglomeration. The pH = 12 condition of two substances surface repeled each other and relyed the interaction of TO precursor functional group and FA surface hydroxyl group on forming (Al)Si-O-Sn chemical bonding at high temperature calcination, which facilitated the formation of nanoscale tetragonal crystalline phase TO to uniformly distribute on the surface of micron-sized FA. The antistatic mechanism was derived from oxygen vacancies and tin interstitium in the intrinsic defects of TO nanoparticles. Preparation mechanism diagram of TOFA composite powder. [Display omitted] •The nano-SnO2@fly ash composite antistatic powder was synthesized by chemical co-precipitation method.•The volume resistivity of composite powder decreased from 7.32 × 109 Ω·cm to 1.82 × 105 Ω·cm.•Strong acidity condition did not reduce agglomeration and alkalinity condition improved dispersity.•Surface coating mechanism and antistatic mechanism were proposed.