润磨预处理对改善MgO球团矿预热焙烧性能的影响

 通过在铁精矿粉中配加镁质粘结剂进行了生产镁质球团矿的试验研究。研究结果表明,与酸性球团矿相比,配加镁质粘结剂生产MgO球团矿时所需要的预热温度和焙烧温度均较高,且焙烧时间也较长。但对铁精矿和镁质粘结剂混匀进行润磨预处理能改善MgO球团矿预热焙烧性能。混合料经润磨预处理后,球团矿预热温度能降低80℃,焙烧温度至少能降低30℃,焙烧时间至少能缩短4min。     

铁精矿成球动力学研究——粘结剂对成球速度的影响

前言实际上,经选矿后的铁精矿并不都适合于高炉炼铁用球团矿。因为优质球团矿生产除合理的工艺制度外总是与铁精矿类型、粒度及粒度组成,以及所选用的粘结剂类型和     

程潮铁精矿添加新型wkd系列粘结剂的氧化球团性能研究

为提高球团矿品位和质量，采用wkd系列新型粘结剂进行了程潮铁精矿生产氧化球团的试验研究，并取得了良好的效果。     

新技术与成果

一种酸性球团矿制造方法一种酸性球团矿制造方法,本发明以高品位铁精矿为原料,膨润土为粘结剂,采用煤粉直接配入料层燃烧替代气体或液体燃料,利用酸性球团矿固结机理,采用烧结机生产酸性球团矿。具有如下优点:改善高炉     

铁精矿冷固球团矿煤基回转窑直接还原新工艺

铁精矿冷固球团矿煤基回转窑直接还原新工艺的关键技术包括复合粘结剂及相应的配套实用技术,提出了含复合粘结剂的生球强度界面作用力综合模型,冷固球团矿强度的粘结膜机理,含复合粘结剂的冷固球团矿催化还原体积反应机制及全窑高温快速还原热工制度。     

莱钢矿建公司冷固结球团配加除尘灰的研究

简要介绍了莱钢矿建公司采用精矿配比除尘灰生产冷固结球团矿的试验，试验确定了铁精矿，除尘灰和粘结剂的合理配比，解决了除尘灰的综合利用问题。     

基于原料物化性能的磁铁精矿造球及氧化焙烧试验研究

以三种磁铁精矿为原料,两种膨润土为粘结剂,进行了单一铁精矿和不同配矿条件下混合铁精矿的造球试验和球团焙烧试验.研究了铁精矿的化学成分、粒度组成和颗粒形貌及其对球团矿质量的影响,探索了不同原料条件下的造球参数及最佳造球条件下氧化球团矿的焙烧参数.其结果可为球团厂合理配矿提供指导.     

在铁矿球团矿生产中膨润土聚合物复合粘结剂的应用前景

从冶金学意义上研究了粘结材料应用的演化——从膨润土到膨润土聚合物复合粘结剂。根据最近的实验室研究、工业试验研究和大规模工业试验研究,表明了膨润土聚合物复合粘结剂在球团矿生产中具有提高冶金性能的独特效果。该粘结剂的选择原则考虑到了铁精矿的组成特性和自身特性。研究表明,俄罗斯生产厂（莫斯科市的“膨润土”公司）对该种粘结剂的应用效果要优于高价进口的类似材料（Floform）。     

提高铁精矿冷固结球团矿强度的途径

本文研究了提高铁精矿冷固结球团矿强度的有效途径，结果表明，在适宜的铁精矿细度，混合料预处理方式与时间下，添加新型粘结剂ＮＢ－１，比“复合粘结剂”ＣＢ的抗压强度指标提高４５％以上，而膨润土不适于制备冷固球团。     

8m2竖炉钒钛球团矿生产实践

通过实验室配矿、焙烧试验,总结、摸索出了利用竖炉生产钒钛球团矿的基本配矿结构和工艺参数,生产出了满足酒钢高炉个性化的护炉需求的钒钛球团矿,盘活了库存钒钛铁精矿资源.     

内配煤球团直接还原铁生产对原料的选择

通过理论分析和实验室试验，研究了精矿粉和煤粉的化学成分对内配煤球团直接还原铁化学组成的影响，提出了用于内配煤球团直接还原铁生产的精矿粉和煤粉的质量要求。     

Use of Iron Ore Fines in Cold-Bonded Self-Reducing Composite Pellets

The feasibility of producing direct reduced iron from cold-bonded, self-reducing composite pellets, constituted from beneficiated iron ore slime, coke, and different binders (dextrin, bentonite, calcium lignosulfonate, and carboxymethyl-cellulose [CMC]) was studied. This was done using a design of experiments approach. It was found that as-received beneficiated iron ore slime is suitable as a raw material for the production of self-reducing composite pellets with carboxymethylcellulose as the most suitable binder. Dry strengths in excess of 300 N/pellet were attained by curing the pellets under ambient conditions. The composite pellets reduced within 20 min to degrees of metallization in excess of 90% at 1100°C, with decrepitation indices significantly below 5%. The degree of metallization of composite pellets increased with an increase in reduction temperature (from 1000 to 1100°C), reduction time (20 min. vs. 40 min), and coke quantity (15% vs. 20%). CMC was identified as the most economical and suitable binder for the Sishen concentrate.     

新型黏结剂强化冷固结球团的作用机理

 黏结剂在冷固结球团中必不可少,目前广泛使用的冷固结球团有机、无机黏结剂如CMC、膨润土和水泥等均会在高温下失效,导致球团高温强度严重下降,因此,寻找一种高温强度良好的黏结剂是目前需要解决的问题。采用新型黏结剂制备冷固结球团,通过XRD和SEM-EDS等对新型黏结剂球团制备原料及球团性能特征进行分析,同时探讨黏结剂对球团冷态抗压强度及高温强度的影响及其作用机理。试验结果表明,黏结剂以流动状态存在于冷固结球团中,可有效吸附或包裹铁矿粉颗粒,增加黏结剂配比可同时提高球团的冷态抗压强度及高温抗压强度;在高温还原性气氛下焙烧冷固结球团,由于发生还原反应,球团金属化率提高,铁矿粉颗粒间空隙增大,导致球团强度下降,焙烧时间为30～90 min时,球团金属化率及抗压强度变化趋势最明显;焙烧初期,球团抗压强度不会发生快速下降,且焙烧结束后球团强度仍可保持为100 N/个左右。     

不同巴润精矿配比球团矿的还原膨胀试验研究

对不同巴润精矿配比球团矿的还原膨胀进行了试验研究,结果表明,球团矿的还原膨胀率与巴润精矿的配比呈显著的正相关。球团生产配加巴润精矿时,其配比应控制在30%以内。巴润精矿球团矿的还原膨胀率高主要是由于巴润精矿中含有较高的挥发组分所致,挥发组分还原膨胀的观点,可以圆满地解释白云鄂博铁精矿引起的球团矿的恶性膨胀,是对球团矿还原膨胀理论的完善和创新。     

粘结剂与铁精矿表面作用机理研究

本文从表面润湿热、表面电性及红外光谱测试入手，研究了“复合粘结剂”ＣＢ与磁铁矿颗粒表面作用机理。研究结果表明：ＣＢ化学吸附于颗粒表面，使矿粒表面亲水性增强，从而改善了磁铁矿的成球性，为成功地制备出优质铁精矿冷固球团创造了条件。     

中关铁矿制备熔剂性球团生球性能试验

 通过增加熔剂性球团矿的入炉比例,能够改善炉料结构,降低炼铁系统能耗,并且通过“源头减量”的途径可以降低炼铁过程中污染物的排放。实现高球比冶炼的核心环节是制备熔剂性球团,而熔剂性球团质量取决于生球的性能,因此,保证生球质量是探究熔剂性球团制备工艺较为重要的环节。由于中关铁矿硅含量较低、镁含量适宜,适合作为低硅熔剂性球团的原料。以中关铁矿为原料探究熔剂性球团的制备工艺,并在此基础上分析了影响熔剂性球团生球质量的因素(粒度、时间、水分、膨润土、SiO₂含量、碱度和MgO含量)。试验结果表明,生球的抗压强度、落下强度及爆裂温度受碱度、SiO₂和MgO含量变化的影响不大;生球的抗压强度、落下强度及爆裂温度主要受造球时间、水分、黏结剂用量、铁矿粉及熔剂的理化性能影响,并在造球时间维持为12 min、水分维持为8%～9%、膨润土用量为2%时,生球抗压强度、落下强度及爆裂温度较优且满足运输与入炉要求。     

配加膨润土抑制球团矿还原膨胀的试验研究

研究了不同巴润精矿配比条件下,膨润土配比与还原膨胀率的关系。结果表明,膨润土对配加巴润精矿球团矿的还原膨胀率有明显的抑制作用,当巴润精矿配比提高时,相应提高膨润土配比就能将球团矿的还原膨胀率控制在正常膨胀范围内。     

Application of Modified Humic Acid (MHA) Binder in the Pelletizing Of Fluxed Hematite Concentrate

Modified humic acid (MHA) binder consists of high molecular weight organic molecules and inorganic part. It is extracted from lignite coal with sodium hydroxide and used in pelletization of iron ore concentrates. Our previous study shows that MHA binder is also a potential binder instead of bentonite for pelletizing of fluxed hematite. For evaluating the use of MHA binder in pelletization of fluxed hematite, pelletizing tests were conducted to optimize parameters, such as dose, firing temperature and time. The results show that the qualities of green/dried balls with 0.6 wt% MHA binder are equal to or even better than that of 0.66 wt% bentonite pellets, and that both are much higher than the minimum requirements of the pellets’ strengths. The compression strength of fired pellets also suggested that MHA binder is promising to completely replace bentonite in pelletizing of fluxed hematite concentrate. However, the abrasion rate of the fired pellets with MHA binder is slightly higher than that of bentonite pellets.     

Pelletizing of sulfide molybdenite concentrates

The results of a pelletizing investigation using various binding components (water, syrup, sulfite-alcohol distillery grains, and bentonite) of the flotation sulfide molybdenite concentrate (～84% MoS₂) from the Mongolian deposit are discussed. The use of syrup provides rather high-strength pellets (>3 N/pellet or >300 g/pellet) of the required size (2–3 mm) for the consumption of 1 kg binder per 100 kg concentrate. The main advantage of the use of syrup instead of bentonite is that the molybdenum cinder produced by oxidizing roasting of raw ore materials is not impoverished due to complete burning out of the syrup. This fact exerts a positive effect on the subsequent hydrometallurgical process, decreasing molybdenum losses related to dump cakes.     

Pelletization Using Humic Substance-based Binder

Humic substances exist widely in lignite coal as high molecular weight organic molecules. They can be used as binders in iron ore pelletization mostly in the form of salt, such as sodium humate and amine humate via extraction from lignite coal. It is worth determining if lignite can be used as a binder without extraction. As a composite binder of organic and inorganics, due to the combustion of humic substance, the strength of fired pellets made with humic substance-based binder decreases slightly. To compensate for this defect and make stronger pellets, cheap calcium bentonite was added into humic substance binder. In this study, a fluxed hematite concentrate was pelletized with various types of binders: lignite plus sodium hydroxide, calcium bentonite activated with modified humic acid (MHA), and MHA binder. Good quality pellets were obtained at optimal parameters. The results show that without extraction procedure, lignite plus sodium hydroxide can be directly used as a binder in pelletization of fluxed hematite; that calcium bentonite improves pellet strength when added to MHA; and that humic substance can partly replace calcium bentonite, reducing the dose of calcium bentonite.