钢渣碳化机理研究

STUDY ON CARBONATION MECHANISM OF STEEL SLAG

通过测定钢渣碳化反应中的温度变化,分析钢渣碳化产物的矿物相,以及测试碳化前后钢渣的热重及孔结构变化,研究钢渣碳化的放热性能和结构组成变化。结果表明:钢渣水化24h累计放热量为30J/g,而钢渣试样碳化1h的累计放热总量达95J/g。碳化后的钢渣试样中有碳酸盐矿物生成,每kg钢渣约可固化储存CO2气体121.8g,并且试样的孔隙率由碳化前的21.76%降至13.34%,抗压强度由碳化前的6.69MPa提高至42.14MPa,且碳化后试样压蒸安定性合格。

Carbonated exothermic performance,minerals and structure changes before and after carbonation of steel slag were investigated by examining heat evolution of steel slag carbonation,carbonated mineral phases,thermogravimetric changes as well as pore size distribution of steel slag specimens.The results show that the hydrated cumulative heat release of steel slag is 30 J/g in 24 h,but the carbonated accumulative heat is 95 J/g in 1 h.Some carbonate minerals appeared in carbonated steel slag specimens,and the carbon dioxide of 121.8 g could be sequestrated by using per kilogram steel slag in carbonated sample.The porosity of the steel slag specimens decreased from 21.76% to 13.34%,due to the carbonation,resulting in that the corresponding compressive strength increased from 6.69 MPa to 42.14 MPa.The carbonated specimens had a qualified autoclave soundness.