Autoclaved Brick from Volume-Stability-Modified Steel Slag and Low Silicon Tailings
1 Department of Chemical Engineering, Hebei University of Science & Technology, Shijiazhuang 050018 P.R. China
2 Hebei Research Center of Pharmaceutical and Chemical Engineering, Shijiazhuang, P.R. China
3 Hebei Engineering and Research Center of Solid Waste Utilization, Shijiazhuang, P.R. China
Steel slag is a major industrial waste. Because of poor volume stability, its utilization was limited. We adopted polyphosphate modified steel slag and tailings to produce the autoclaved brick. The effects of various factors influencing the performance of brick were investigated, and the results were obtained: forming water 9%, forming pressure 20MPa, curing regime 4(temperature rising, hr)-4(temperature holding at 180°C, hr)-natural cooling (temperature dropping). With the content of modified steel slag in brick increased from 11% to 25%, the content of cement reduced from 7% to 5%, the compressive strength value increased from 11.6MPa to 22.1MPa.
Key words: Steel slag / Iron tailings / Volume stability / Autoclaved brick
© The Authors, published by EDP Sciences, 2016
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