钢渣为炼钢过程中产生的主要固体废弃物,由于其安定性不良,资源化利用难以推广.拟通过压力釜碳化改善钢渣及透水砖安定性,测试钢渣的压蒸粉化率、f-CaO含量及CO2吸收量,制备固碳钢渣透水砖后测试其抗压强度、透水性能及安定性并计算其固碳量.结果表明:钢渣经碳化处理后,压蒸粉化率及f-CaO含量显著降低,安定性大幅改良,2种粒径钢渣CO2吸收量(质量比)分别为4.3％和5.9％;碳化后固碳钢渣透水砖的28 d抗压强度提升显著;透水性能受透水砖碳化养护的影响较大,经碳化养护后透水系数下降;透水砖安定性受钢渣骨料碳化的影响较大,受透水砖碳化养护的影响不大;目标孔隙率分别为14％和20％的透水砖,单块透水砖最大固碳量达到232.9和273.1 g.
Study on the properties and carbon fixation effect of carbon fixing steel slag permeable bricks
As a major solid waste product of steelmaking,steel slag has poor stability and thus is difficult to be widely utilized as a resource.This study aims to use a pressure tank to carbonize steel slag and enhance the stability of steel slag and permeable bricks.This in-volves testing the pressure vaporization rate,the f-CaO content and the CO2 absorption of steel slag.Additionally,carbon fixing steel slag permeable bricks are made and their com-pressive strength,water permeability and stability are tested,and the amount of carbon fix-ation is also calculated.The results indicate that carbonization significantly reduced the pres-sure vaporization rate and f-CaO content of steel slag,thereby greatly improved its stability.The CO2 absorptions(mass ratio)of steel slag of two different particle sizes are 4.3％and 5.9％,respectively.After carbonization,the 28 d compressive strength of solid carbon steel slag permeable bricks is significantly enhanced.The permeability of the bricks is greatly in-fluenced by carbonization curing,with the permeability coefficient decreasing after carboni-zation curing.The stability of permeable bricks is greatly affected by the carbonization of steel slag aggregate,but not significantly affected by the carbonization maintenance of per-meable bricks.With the target porosity of 14％and 20％,the maximum carbon fixation of a single permeable brick can reach 232.9 and 273.1 g.
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