Experimental study on brick making from Sifangou tailings in Qinling Gold Mine
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 character-istics 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 pres-sure>molding moisture.This paper provides a basis and reference for tailings brick making and comprehensive utiliza-tion of Sifangou tailings in Qinling Gold Mine.
gold tailingsprocess mineralogysintered bricksteaming-free and baking-free brickcomprehensive utilization
万方数据
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