煤-矸坑口电厂粉煤灰物化特性实验研究
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摘要
通过对兖矿集团鲍店煤矿坑口电厂粉煤灰进行微观结构、化学组成和颗粒形态的测试分析,发现该电厂粉煤灰的主要物相为石英、氧化铝、氧化钙,伴有少量赤铁矿等,其中Si O2、Al2O3和Fe2O3等活性物质的含量达39. 7%,Ca O含量高达35. 6%,且存在大量表面多孔的非晶态玻璃相,表明该粉煤灰具有较高的活性。采用正交试验方法,开展了矿井充填用高掺量粉煤灰的配比实验,获得了最佳配比。实验得到了适合高掺量粉煤灰浆液凝固时间的判定标准:粉煤灰含量若低于50%,宜采用贯入深度2. 5 cm、贯入阻力分别为0. 3 MPa和0. 6 MPa作为浆液达到初凝和终凝的标准;粉煤灰含量超过50%时,贯入阻力分别为0. 25 MPa和0. 5 MPa。
The microscopic structure,chemical composition,particle morphology and other aspects of fly ash from Baodian coal mine pithead power plant of Yanzhou Coal Mining Co. Ltd. was researched. It can be found that the main phase of fly ash are quartz,alumina,calcium oxide,and a bit of hematite,wherein the content of the active substance including SiO2,Al2 O3,Fe2 O3 up to 39. 7%,content of CaO35. 6%,and there is a large number of surface porous amorphous glass phase,which are ensure the high activity of the fly ash. Then using orthogonal test method mix the fly ash,cement,additive A and B to prepare the filling material,indicate that the fly ash has the greatest effect on compressive strength of filling material by the range analysis method,the additive A,the additive B,cement as followed. The best ratio was got by comparing different factors dosage with compressive strength change from the curve.Initial and final set criterion were obtained through experiment,i. e.,if the penetration depth of the national standard is 2. 5 cm,when fly ash content is less than 50%,the penetration resistances of initial set and final set are 0. 3 MPa and 0. 6 MPa,respectively; when the fly ash content is greater than or equal to 50%,penetration resistances are 0. 25 MPa,0. 5 MPa,respectively.
The microscopic structure,chemical composition,particle morphology and other aspects of fly ash from Baodian coal mine pithead power plant of Yanzhou Coal Mining Co. Ltd. was researched. It can be found that the main phase of fly ash are quartz,alumina,calcium oxide,and a bit of hematite,wherein the content of the active substance including SiO2,Al2 O3,Fe2 O3 up to 39. 7%,content of CaO35. 6%,and there is a large number of surface porous amorphous glass phase,which are ensure the high activity of the fly ash. Then using orthogonal test method mix the fly ash,cement,additive A and B to prepare the filling material,indicate that the fly ash has the greatest effect on compressive strength of filling material by the range analysis method,the additive A,the additive B,cement as followed. The best ratio was got by comparing different factors dosage with compressive strength change from the curve.Initial and final set criterion were obtained through experiment,i. e.,if the penetration depth of the national standard is 2. 5 cm,when fly ash content is less than 50%,the penetration resistances of initial set and final set are 0. 3 MPa and 0. 6 MPa,respectively; when the fly ash content is greater than or equal to 50%,penetration resistances are 0. 25 MPa,0. 5 MPa,respectively.
引文
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[13]聂轶苗,刘淑贤,张晋霞,等.粉煤灰的活性研究及进展[J].粉煤灰综合利用,2013(3):52-56.
[14]李桂芹.粉煤灰活性的激发方式及使用现状[J].广东化工,2014,41(18):108-109.
[15]聂轶苗,马鸿文,杨静,等.矿物聚合材料固化过程中的聚合反应机理研究[J].现代地质,2006(2):420-426.
[16] Fraay A L A,Beijing J M,Haan Y M. The reaction of fly ash in concrete,a critical examination[J]. Cem. Concr. Res.,1989,15:235-246.
[17]任永鹏,魏启荣. Na2SiO3-CaSO4·2H2O复合激发粉煤灰活性机理研究[J].混凝土,2007(11):82-88.
[18]叶东忠.不同激发剂对粉煤灰火山灰活性的影响[J].粉煤灰,2009(2):10-12.
[19]张扬,李四平,陈兵,等.粉煤灰活性激发剂的试验研究[J].混凝土,2012(9):63-68.
[20]李东旭.低钙粉煤灰在不同碱环境中的活化研究[J].材料导报,2000,14(11):59-61.
[2]茅沈栋,李镇,方莹.粉煤灰资源化利用的研究现状[J].混凝土,2011(7):82-84.
[3]李树荣,张卫东,陈舸,等.坑口电厂粉煤灰的研究与利用[J].煤炭科学技术,2005,33(7):26-30.
[4]丁益,任启芳.粉煤灰活化处理技术与应用进展[J].安徽建筑工业学院学报:自然科学版,2009,17(3):72-74.
[5]卫亚儒,李红侠.粉煤灰活化处理及应用[J].粉煤灰综合利用,2005(3):45-46.
[6] Katz A. Microscopic study of alkali-activated fly ash[J]. Cementand Conerete Researeh,1998,29(2):197-208.
[7] Sharma R L,Pandey S P. Influence of mineral additives on the hydration characteristics of ordinary Portland cement[J]. Cement and Concrete Research,1999(29):1525-1529.
[8]杨晓光,倪文,张筝.碱激发对粉煤灰活性的影响[J].北京科技大学学报,2007,29(12):1195-1199.
[9]方军良,陆文雄,徐彩宣.粉煤灰的活性激发技术及机理研究进展[J].上海大学学报:自然科学版,2002,8(3):255-260.
[10]孙俊民,韩德馨.粉煤灰的形成和特性及其应用前景[J].煤炭转化,1999,22(1):10-14.
[11] Fariborz G. Characteristics and composition of fly ash from canadian coal-fired power plants[J]. Fuel,2006,85(10):1418-1427.
[12]李婷.高效煤粉工业锅炉粉煤灰的特性研究[J].煤炭转化,2014,37(4):81-84.
[13]聂轶苗,刘淑贤,张晋霞,等.粉煤灰的活性研究及进展[J].粉煤灰综合利用,2013(3):52-56.
[14]李桂芹.粉煤灰活性的激发方式及使用现状[J].广东化工,2014,41(18):108-109.
[15]聂轶苗,马鸿文,杨静,等.矿物聚合材料固化过程中的聚合反应机理研究[J].现代地质,2006(2):420-426.
[16] Fraay A L A,Beijing J M,Haan Y M. The reaction of fly ash in concrete,a critical examination[J]. Cem. Concr. Res.,1989,15:235-246.
[17]任永鹏,魏启荣. Na2SiO3-CaSO4·2H2O复合激发粉煤灰活性机理研究[J].混凝土,2007(11):82-88.
[18]叶东忠.不同激发剂对粉煤灰火山灰活性的影响[J].粉煤灰,2009(2):10-12.
[19]张扬,李四平,陈兵,等.粉煤灰活性激发剂的试验研究[J].混凝土,2012(9):63-68.
[20]李东旭.低钙粉煤灰在不同碱环境中的活化研究[J].材料导报,2000,14(11):59-61.