Study on the Mechanism of Fired Bricks from Iron Tailings

Lian Hua Liu; Gao Xiang Du; Jing Hui Liao

doi:10.4028/www.scientific.net/AMR.549.620

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 549Study on the Mechanism of Fired Bricks from Iron...

Study on the Mechanism of Fired Bricks from Iron Tailings

Abstract:

Fired bricks were prepared by using iron tailings from Inner Mongolia as the main material based on analysis of its basic characterization and investigate the performance and mechanism of fired bricks at different firing temperature. The results showed that the density and compressive strength increased with the rise of firing temperature, while the water absorption decreased. The analysis demonstrated that calcite was decomposed into CaO and CO₂ at 800°C completely by DTA-TG and XRD, which lead to the increase of pore and decrease of density. Kaolinite was decomposed into metastable quartz and metakaolin at about 850°C and then hornblende transformed into quartz and hematite with the rise of temperature. The SEM photographs showed that the glass phase was increased and the sheetlike fabric was decreased when the firing temperature rose to 1100°C. The glass phase was filled into the pores contributing to the decrease of the porosity and making the bricks more compact which help to improve the bulk density and compressive strength. The glass phase was concerned with the reaction, which can help the grain diffusion and thus increase the speed of reaction.

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Periodical:

Advanced Materials Research (Volume 549)

Pages:

620-624

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.549.620

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Online since:

July 2012

Authors:

Lian Hua Liu, Gao Xiang Du, Jing Hui Liao

Keywords:

Fired Brick, Firing Temperature, Iron Tailing, Mechanism

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