Study on reusing of spent fluid catalytic cracking (sFCC) catalyst from the Dung Quat Refinery as an active additive to Portland cement

Abstract

Spent fluid catalytic cracking (sFCC) catalyst from the Dung Quat refinery has been studied as an active aluminosilicate additive to Portland cement. The experimental results showed that the heat-treated sFCC materials have high lime absorption capacity in accordance with Vietnamese Standard TCVN 3735:1982 (> 100 mg CaO g-1). The Portland blended cement products prepared by blending pure Portland cement PC40 with 10-20 wt-% of sFCC materials achieve good 28-day compressive strength (R28 > 50 N mm-2), the compressive strength ratio indexes (IR) of sFCC additives meet TCVN 6882:2016’s requirements (IR > 75%). The other physico-mechanical properties such as initial setting time, final setting time, volume stability also meet requirements in TCVN 6260:2009 about Portland blended cement - Specifications. Hence, the spent FCC catalyst from Dung Quat refinery is expected to effectively reuse as an active additive to Portland cement in appropriate experimental conditions (10-20 wt-% sFCC heat-treated at 600 oC in Portland cement blended).