Manufacture and Characterization of Fired Bricks from Gold Mine Waste Rocks

Minerals

Mohamed Elomari¹  Azzeddine Benahsina¹  Mohammed Abdouh Bennouna²  Rachida Bouachera³  Yassine Taha⁴ 

[1] LAEPT Laboratory, Faculty of Sciences Semlalia, Cadi Ayyad University (UCA), BP2390, Marrakesh 40000, Morocco;Laboratory of Applied Chemistry and Biomas, Faculty of Sciences Semlalia, Cadi Ayyad University (UCA), BP2390, Marrakesh 40000, Morocco;Laboratory of GeoSciences Semlalia, Faculty of Sciences Semlalia, Cadi Ayyad University (UCA), BP2390, Marrakesh 40000, Morocco;Mining Environment and Circular Economy Program (EMEC), Mohammed VI Polytechnic University, Lot 660 Hay Moulay Rachid, Ben Guerir 43150, Morocco;

关键词: valorization;    mining waste rocks;    fired bricks;    environment;    clays;    mechanical properties;   

DOI  :  10.3390/min11070695

来源: DOAJ

【 摘 要 】

The purpose of this research was to evaluate the possibility of using gold mine waste rocks (GMWRs) as alternative raw material for the manufacturing of fired bricks. The feasibility study was assessed through (i) physical, chemical, mineralogical and environmental characteristics of GMWRs; (ii) determination of the natural clay (NC) substitution effect when using GMWRs; (iii) the effect of the firing temperature on the mechanical and physical properties of the fired bricks. Five mixtures of NC and GMWRs were studied. The percentages of substitution of NC with GMWRs varied from 0 to 100%. The brick specimens were fired at 900 °C, 1000 °C and 1050 °C. The results show that increasing the firing temperature improved the flexural strength and density of the bricks, while the substitution of NC with GMWRs caused a reduction in the mechanical resistance of the bricks and an increase in their porosity and, consequently, their water absorption rate. However, the properties of bricks that contained up to 80 wt% of GMWRs and fired at 1000 °C and 1050 °C satisfied the requirements set by the applicable civil engineering and environmental standards. This was found to be an efficient and sustainable solution to mitigate environmental hazards and better manage mining wastes, concurrently producing marketable products from them, which is in accordance with the circular economy concept.

【 授权许可】

Unknown