COMPARATIVE ANALYSIS OF INCORPORATION OF DIFFERENT PARTICLE SIZES OF HIGH-LEADED CATHODE RAY TUBE GLASS IN FIRED CLAY BRICKS

Gilbert U. Adie; Abdulazeez M. Hammed; Nene O. Adim

doi:10.29121/ijoest.v6.i1.2022.221

Authors

Gilbert U. Adie Senior Lecturer, Department of Chemistry, University of Ibadan, Oyo state, Nigeria
Abdulazeez M. Hammed Research Fellow, Department of Chemistry, University of Ibadan, Oyo state, Nigeria
Nene O. Adim Research Fellow, Department of Chemistry, University of Ibadan, Oyo state, Nigeria

DOI:

https://doi.org/10.29121/ijoest.v6.i1.2022.221

Keywords:

Cathode Ray Tube Glass, Incorporation, Fired Clay Bricks, Particle Size

Abstract

End-of-life cathode ray tubes (CRTs) have become global problem in the pool of waste electrical and electronics owing to higher concentration of lead (Pb) and this needs urgent management in an ecofriendly manner. In this study, spent CRT glass was incorporated in clay to make burnt bricks for construction. Samples of CRT glass were collected from technicians’ workshops, manually dismantled, pulverized, milled and sieved into three particles sizes (PS), namely; 0.6mm ≤1.0mm, ≤2.0mm. The metallic composition was determined with Inductive Coupled Plasma- Optical Emission Spectrometric technique (ICP-OES). Each PS was mixed with clay at percentages ranging from 0% as control to 15% CRT and moulded using dry compression technique, dried and fired in furnace at 800 ⁰C. Mechanical properties of fired bricks products were assessed including water absorption, linear shrinkage and compressive strength. The 4wt% CRT-clay composition for ≤0.6mm PS exhibited highest strength with low linear shrinkage and medium water absorption and was selected as optimum composition. Lead (Pb) leachability from fired CRT-glass/clay from the three particle sizes using TCLP and SPLP were within permissible limit of 5.0mg/L set by US-EPA. Lead leachability from raw CRT glass varied according to particle sizes and was for all particles sizes higher in many folds than to EPA limit. From the findings, it can be shown that the optimum composition of less than 0.6mm particle size is a durable and environmentally safe brick product that can be used for building purpose

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