Research on the Preparation of Baking-free Brick using the Tailings of Flue Gas Desulfurization of Pyrolusite Slurry

摘要

This paper studies the preparation of baking-free brick using the tailings of flue gas desulfurization of pyrolusite slurry, aiming to explore the optimal technological conditions. Experimental results show that the particle size of the tailings of flue gas desulfurization of pyrolusite slurry with the concentration up to 95% is below 80μm, which are the appropriate material for the preparation of baking-free bricks. "Byproduct tailings of flue gas desulfurization of pyrolusite slurry - cement cementitious materials - water" system is a relatively good ingredient program. The test results indicate that the flexural and compressive strength of the baking-free brick sample increases with the rise of forming pressure. Appropriately adding the dosage of binder could improve the flexural and compressive strength of the baking-free brick sample, but when it is added to a certain degree, the strength will decrease instead. To sum up, the optimal parameters of the baking-free brick product are shown as follows: desulfurization tailings: cementitious materials = 5:1, the forming pressure is 20 MPa, the moisture content is 10% and the natural curing time is controlled in the range of 7 -28 days.