粘结剂在转炉造渣剂中的应用研究
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摘要
以转炉除尘灰和氧化铁皮为原料,膨润土、氧化钙和水玻璃作为粘结剂制备了转炉造渣剂,研究了粘结剂种类对转炉造渣剂强度的影响。结果表明,膨润土和氧化钙单独作为粘结剂使用时,试样的生球落下强度较高,但干球抗压强度无法满足生产指标;水玻璃单独作为粘结剂使用时,试样的干球抗压强度较高,但生球落下强度较低,加入量超过原料质量的7%时方可满足生产需求;三者混合使用时,采用正交实验确定了可满足生产指标的最优配比,即膨润土、氧化钙和水玻璃加入量分别为原料质量的4%、7%和3%,此时制备的转炉造渣剂性能好,生球落下强度为3.7次,干球抗压强度为9.89 MPa。
With the ESP dust from converter and iron scrap as raw materials, a kind of slagging agent for converter was prepared with bentonite, calcium oxide and water glass as the binders. The influence of different binders on the strength of slagging agent was studied. It was found that, when the sample was prepared with bentonite or calcium oxide as the binder, the drop number of the produced green pellet was higher, but the compressive strength of dry pellet could not meet the production indicators. Only with water glass as the binder, the prepared dry green pellet had the higher compressive strength and lower drop number. However, with the addition of water glass at the amount of over 7% of raw material(by mass), the prepared pellet could meet the requirement for production. The orthogonal experiments determined the optimal proportioning of a combination of bentonite, calcium oxide and water glass as the binder for the normal production with the addition at the amount of 4%, 7% and 3%, respectively, of the raw material(by mass). The slagging agent showed good properties. The drop number and the compressive strength for the prepared green pellet was 3.7 times and 9.89 MPa, respectively.
With the ESP dust from converter and iron scrap as raw materials, a kind of slagging agent for converter was prepared with bentonite, calcium oxide and water glass as the binders. The influence of different binders on the strength of slagging agent was studied. It was found that, when the sample was prepared with bentonite or calcium oxide as the binder, the drop number of the produced green pellet was higher, but the compressive strength of dry pellet could not meet the production indicators. Only with water glass as the binder, the prepared dry green pellet had the higher compressive strength and lower drop number. However, with the addition of water glass at the amount of over 7% of raw material(by mass), the prepared pellet could meet the requirement for production. The orthogonal experiments determined the optimal proportioning of a combination of bentonite, calcium oxide and water glass as the binder for the normal production with the addition at the amount of 4%, 7% and 3%, respectively, of the raw material(by mass). The slagging agent showed good properties. The drop number and the compressive strength for the prepared green pellet was 3.7 times and 9.89 MPa, respectively.
引文
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[2] El-Hussiny N A,Shalabi M E H.A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process[J].Powder Technology,2010,205(1):217-223.
[3] 于先坤,杨洪,华绍广.冶金固废资源化利用现状及发展[J].金属矿山,2015,44(2):177-180.
[4] 张寿荣,张卫东.中国钢铁企业固体废弃物资源化处理模式和发展方向[J].钢铁,2017,52(4):1-6.
[5] 刘真真,孙体昌,余文,等.粘结剂对某高铁尾矿含碳球团强度的影响[J].矿冶工程,2013,33(6):84-87.
[6] 甘胤,王吉坤,包崇军,等.冷压球团技术在冶金中的研究进展[J].矿产综合利用,2014(1):10-15.
[7] 毛瑞,王飞,杜屏,等.基于转底炉工艺的冶金含铁尘泥造球试验研究[J].矿冶工程,2017,37(2):107-111.
[8] 罗渝东,郭秀键,李勇.钢铁厂除尘灰冷压成球技术的实验研究[J].烧结球团,2014,39(3):44-47.
[9] Mandal A K,Sarkar A,Sinha O P.Utilization of Lime Fines as an Effective Binder as well as Fluxing Agent for Making Fluxed Iron Ore Pellets[J].Journal of the Institution of Engineers,2016,97(1):69-75.
[10] 李楠,顾华志,赵惠忠.耐火材料学[M].北京:冶金工业出版社,2010.
[11] 鞠建英,申东铉.膨润土在工程中的开发与应用[M].北京:中国建材工业出版社,2003.
[12] 孙波,李家新,龙红明,等.粘结剂对尘泥含碳球团干球强度的影响[J].烧结球团,2014,39(2):32-36.
[13] 刘效彬.中国传统灰浆的化学组成特征及粘结机理研究[D].杭州:浙江大学人文学院,2015.
[14] 侯彩英,周艳明,罗红,等.水玻璃的固化机理及其提高耐水性途径分析[J].陶瓷,2011(8):18-21.