文章摘要
张妍,常钧,何萍.钢渣中游离氧化钙和氧化镁碳酸化反应[J].,2018,58(6):634-640
钢渣中游离氧化钙和氧化镁碳酸化反应
Carbonation reaction of free CaO and MgO in steel slag
  
DOI:10.7511/dllgxb201806012
中文关键词: 钢渣  碳酸化  体积安定性  Rietveld物相定量分析
英文关键词: steel slag  carbonation  volume stability  Rietveld quantitative phase analysis
基金项目:国家自然科学基金资助项目(51172096).
作者单位
张妍,常钧,何萍  
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中文摘要:
      在CO2含量为99.9%,压力为0.2 MPa条件下,对钢渣粉进行碳酸化处理,并作为水泥混合材料制成净浆试件,对试件进行压蒸,研究碳酸化反应时间对试件体积安定性的影响.结果表明,随着碳酸化反应时间的延长,钢渣中的硅酸盐、游离CaO、Ca(OH)2和游离MgO等物质与CO2气体进行反应,主要生成CaxMg1-xCO3.掺加未经碳酸化处理钢渣的试件,压蒸后破坏严重;掺加碳酸化反应10 min钢渣的试件膨胀率为1.03%,试件有明显裂纹;掺加碳酸化反应20 min钢渣的试件膨胀率为0.29%,符合国家标准,体积安定性合格.碳酸化处理20 min后,钢渣中游离CaO含量由2.54%降至0.84%,游离MgO含量由3.8%降至2.4%,试块压蒸后未出现Mg(OH)2,镁离子以水化硅酸镁形式存在于无定形物中.
英文摘要:
      Under the condition of CO2 content of 99.9% and pressure of 0.2 MPa, the steel slag powder is carbonized and used as partial replacements of Portland cement to prepare a pure pulp test piece. The samples are then autoclaved to investigate the influence of carbonation time on the volume stability of the samples. The results show that the carbonation time facilitates the carbonation reaction, the silicate, free CaO, Ca(OH)2 and free MgO in the steel slag can be reacted with CO2 gas, and the products of carbonation are mainly CaxMg1-xCO3. After autoclaved, the sample with steel slag uncarbonated is broken completely. The sample with steel slag carbonated for 10 minutes is cracked and the expansion degree is 1.03%. However, the expansion degree of the sample with steel slag carbonated for 20 minutes is 0.29%, which meets the national standards, the volume stability is qualified. In the steel slag carbonated for 20 minutes, the content of free CaO decreases from 2.54% to 0.84%, the content of free MgO decreases from 3.8% to 2.4%. Mg(OH)2 is not found in the autoclaved samples, because Mg2+exists in the amorphous in the form of hydrated magnesium silicate.
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