【作者】 李彩霞；

【导师】 任瑞晨；

【作者基本信息】 辽宁工程技术大学 ， 矿物加工工程， 2011， 博士

【摘要】 随着全球铁矿品位的降低,必须对其进行选矿,生产铁精矿粉,然后制成球团矿进行冶炼。而在生产球团中必须加入粘结剂。膨润土是冶金球团中首选的粘结剂。但是,由于膨润土基粘结剂属于无机硅酸盐矿物,其添加量势必影响熟球的品位,进而影响炼铁高炉的利用系数。常规添加量为2～3%,国内先进水平为1～1.5%。不同成因和产地的膨润土,其结构、组成和性质不同,而这种差异又将影响其产品的开发。因此,借助于“构效关系”及材料科学“四要素”学术思想,研究“膨润土的结构、组成和性质-球团粘结剂-应用性能”之间的关系,即膨润土基冶金球团粘结剂构效关系。用以减少研发成本,探索膨润土系列产品开发的普遍规律。因此,本研究具有重要的理论意义和应用价值。本论文以北票华源矿业公司、阜新八楼子和锦州黑山三地的膨润土为原料,通过XRD、SEM等分析,研究其结构、组成和性质;通过对这三种膨润土的钠化工艺技术、有机药剂优选等试验研究,找出了制备球团粘结剂的较好工艺条件;通过正交试验,研究膨润土的性能指标与球团矿性能指标之间的关系。通过TG和SEM分析,研究膨润土基粘结剂的吸水性能和热稳定性等应用性能指标,其机理的分析为构效关系的理论研究奠定了基础。其中北票华源膨润土基球团粘结剂产品已经产业化,添加量为1.2 %,达到国内先进水平,已经应用于国内多家钢铁公司。在前人工作基础上,通过对大量膨润土球团粘结剂试验数据分析整理,利用偏最小二乘法回归分析、逐步回归法与神经网络建模分析相结合的方法,找出膨润土吸蓝量、胶质价、膨胀容等13项因素与球团质量指标-生球抗压强度、落下强度、爆裂温度和干球抗压强度的构效关系模型,找出了影响球团矿性能指标的主要因素;利用试验数据验证了所建立的数学模型:膨润土原土和钠化土基本吻合;添加有机质辅助原料的改性土差别较大,有待于进一步研究。构效关系数学模型将为膨润土球团粘结剂生产及自动化控制软件研制奠定基础;进一步为膨润土系列产品的开发提供借鉴。更多还原

【Abstract】 With the global iron ore grade lowing down, it is necessary to dress iron ore, and then use the concentrate to produce iron pellet for smelting. Binder must be added in the process of producing pellets. Bentonite is the preferred binder in metallurgy pellets industry.But bentonite is a kind of inorganic silicate minerals, the dosage of which affects the grade of ripe pellet, furthermore, it affects the coefficient of utilization of blast furnace`s capacity. The conventional additives is 2~3 %, advanced domestic level is 1~1.5 %. Bentonite of sorts of formation conditions and original places, has different structures, composition and properties,which will affect the development of the bentonite`s production.Thus,by using structure activity relationship and“four factors”of material science, we make researches on the relationship among structure and composition of bentonite—pellet binder-application performance, which is also called structure activity relationship of bentonite metallurgy pellet binder, in order to decrease the cost of development and explore the universal law for Bentonite products’development.Consequently, this subject has important theoretical significance and application value.The material of this subject is from Beipiao Huanyuan Mining Company, Fuxin Balou and Jinzhou Heishan, by using analysis of XRD and SEM, the structure, composition and properties are analyzed; by using experimental study on sodium process technology, organic reagents optimization of this three kinds of bentonite, the best processing condition of producing pellet has been found out; by using orthogonal experiment, the relationship on performance index between bentonite and iron ore pellet; By using analysis of TG and SEM on bentonite`s binder, the application performance index on Bibulous performance and Thermal stability is studied, and the analysis of mechanism lays a foundation for the research on structure-activity relationship. Meanwhile, bentonite of Beipiao Huayuan has been industrialization,the additive of which is 1.2 %,and it has reached the advances domestic level,and it has been applied to many Chinese Steel Companies.Based on the previous work, through a lot of bentonite pellet binder test data collection and analysis by partial least-squares regression analysis, stepwise regression, Neural Network Modeling analysis, bentonite`s blue absorption power, colloid index, swelling capacity and so on,13 factors and pellet quality index are found; The structure-activity relationship model of green ball compressive strength, ropping strength, ecrepitation temperature and Dry-Bulb compressive strength, finds out the major factors that affect pellet’s performance index; Prove the model with the test data : sodium turn soil is fit in the main; Retrofit soil added organic matter auxiliary materials has some deviation,and it needs to be further study.SAR models lay the foundation for the production of bentonite pellet binder and development of automation and control software. Which can give references for development of bentonite products.更多还原