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Experimental study on brick making from Sifangou tailings in Qinling Gold Mine

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  • Henan Academy of Geology&Ministry of Natural Resources,Zhongyuan Urban Agglomeration Multi-element Urban Geological Big Data Engineering Technology Innovation Center|Henan Academy of Geology&Ministry of Natural Resources,Zhongyuan Urban Agglomeration Multi-element Urban Geological Big Data Engineering Technology Innovation Center|Geological Disaster Prevention and Control Center of Henan Provincial Bureau of Geology&Henan Province Geological Environment Ecological Restoration Engineering Technology Research Center|Geological Disaster Prevention and Control Center of Henan Provincial Bureau of Geology&Henan Province Geological Environment Ecological Restoration Engineering Technology Research Center|Geological Disaster Prevention and Control Center of Henan Provincial Bureau of Geology&Henan Province Geological Environment Ecological Restoration Engineering Technology Research Center
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Abstract:

In order to explore the comprehensive utilization method of Sifangou tailings,Qinling Gold Mine,tests on the preparation of sintered brick and steam-free and baking-free brick based on the process mineralogical characteristics were carried out.The results show that the composition and particle size of the tailings makes them suitable for brick making;the optimal test conditions for sintered brick preparation are 15 %bentonite ratio,7 %molding moisture,15 MPa molding pressure,10 ℃/min heating rate,1 050 ℃ sintering temperature and 2 h heat preservation time.The sintered brick can reach Grade MU25 and can be used in severe weathering regions;the optimal test conditions for steam-free and baking-free brick preparation are 25 MPa molding pressure,18 % molding moisture,and 20 % cement ratio.The influence of each factor on the compressive strength of the sample is as follows:cement ratio>molding pressure>molding moisture.This paper provides a basis and reference for tailings brick making and comprehensive utilization of Sifangou tailings in Qinling Gold Mine.

Keywords:

gold tailings;process mineralogy;sintered brick;steaming-free and baking-free brick;comprehensive utilization