新型有机粘结剂GPS用于铁矿球团的研究

本研究采用新型有机粘结剂GPS替代或部分替代膨润土制备铁矿球团.研究结果表明:配加0.2%的单一粘结剂GPS,即可获得性能满足要求的生球.当配加0.1%GPS 0.5%膨润土时,生球的落下强度为3.2次、抗压强度11.0 N/个、爆裂温度＞600 ℃,成品球的抗压强度在2 450 N/个左右,与配加2.0%膨润土的相比较,在满足生球强度、爆裂温度和焙烧球强度的基础上,使球团矿铁品位提高了1个百分点以上.     

微波加热制备有机粘结剂预热球团的研究

介绍微波加热技术原理、特点及其在冶金领域中应用的现状。针对有机粘结剂铁矿球团预热阶段强度低的问题,进行了微波预热球团的实验研究,并与常规管炉预热效果进行了比较。通过光学显微镜和SEM等测试手段,分析了微波预热铁矿球团的机理。实验结果表明,采用微波预热,当微波功率为2 500 W,微波预热终点温度为750℃时,预热球每球抗压强度为448 N;而采用常规管炉预热,在温度为750℃下预热10 min,预热球抗压强度仅为129 N。测试分析结果表明,微波预热球团内部磁铁矿大部分氧化成赤铁矿,赤铁矿连接成片,晶形相互连接较好,提高了预热球团的强度。     

竖炉球团加有机粘结剂的经济效益

选择膨润王最便宜的球团厂为例,计算分析添加人格伉的有机粘结剂后的经济效益.球团矿只有实行优质优价政策,竖炉球团有可能使用有机粘结剂.计算结果表明,在年产３０万吨球团矿的条件下,当ＴＦｅ品位提高１％,售价增加７～９元／ｔ时,投篱产出的利润为７０．、！１５４．１万元／ａ。     

提高有机粘结剂球团强度的试验研究

Ｓ型粘结剂是一种粘性很大的有机物，具有极强的吸湿性，保水性和阳离子交换性，高温下全部燃烧挥发，但单独使用，焙烧温度在１２００－１２２０℃范围内，成品球团矿的强度很难满足大高炉冶炼的要求。为此进行了试验研究，研究结果：加入一定量的Ｘ型添加剂，可大大提高原有粘结剂球团的强度，满足生产要求。     

球团用有机粘结剂LR的试验研究

为达到炼铁原料精料的目的，采用有机粘结剂代替膨润土来提高球团含铁品位，是国内外球团界公认的趋势。主工作自行研制球团用有机粘结剂ＬＲ。实验室造球试验表明，添加量为０．０５％时膨润土添加量可降低至０．９５％。     

氧化球团粘结剂的最佳选择

本文从降低氧化球团的膨润土用量出发，进行中膨润土 ，有机粘结剂和有机＝无机复合粘结剂的造球性能试验，从结剂与精矿粉的混合效果，成品球的质量和成本综合考虑，氧化球团采用复合粘结剂是最佳选择。     

竖炉型含碳球团有机粘结剂的选择与应用

对竖炉型含碳球团有机粘结剂进行了选择研究，对其冶金性能进行了比较，并提出了几种适用于竖炉型含碳球团的有机粘结剂。     

铁矿球团生球的固结机理及强化途径

通过生球强度破坏机理分析,得出通过对造球原料进行润磨可以有效的增大晶粒间的范德华力,增加生球的机械强度,添加能够通过范德华力、静电力、氢键、化学键、配位键等与铁矿颗粒表面发生作用的粘结剂也可以有效地提高生球的机械强度;提高球团的爆裂温度的有效方法是均衡球团表面气化和内部扩散作用,均衡球团表面气化和内部扩散作用的主要措施是降低球团表面气化的速度,使表面扩散速度减小,添加具有亲水基的有机粘结剂和膨润土可以降低自由水或毛细水的扩散速度,提高球团的爆裂温度;通过对造球原料的改性对生球的强度的提高是有限的,添加有机粘结剂或复合粘结剂强化生球强度仍然是今后发展的一个重要方向。     

新型有机粘接剂作球团添加剂试验研究

针对国内球团厂膨润土添加量过大,造成球团矿铁品位降低的问题,研究了新型添加剂M部分替代膨润土制备球团的效果。结果表明,添加少量的有机粘结剂可有效降低膨润土用量,用0.1%的M拌0.6%的膨润土造球,球团矿的各项性能指标均能满足生产要求,比只添加2%膨润土的球团铁品位提高了1.17%。     

粘结剂对程潮铁精矿球团质量的影响

研究了程潮铁矿球团原料条件下,配加膨润土、有机粘结剂一羧甲基纤维素钠(CMC)、以及二者的复后粘结剂对球团生产及球团矿质量的影响.结果表明,在1.5％膨润土+0.05％羧甲基纤维素钠(CMC)复合的条件下,取得了良好的试验效果,生球落下强度＞6次/个,抗压强度＞10 N/个,爆裂温度＞ 600℃,成品球抗压强度＞2 5...     

球团矿粘结剂的最佳选择

为了降低球团膨润土用量 ,进行了几种膨润土、有机粘结剂及有机 /无机复合粘结剂的造球试验 ,试验结果表明 :在本钢现有条件下 ,选择合适比例的钠基膨润土和有机粘结剂生产的球团矿能满足高炉冶炼要求 ,但复合粘结剂效果最好     

Temperature Distribution of Iron Ore Pellet Bed in Grate

 The temperature distribution of iron ore pellet bed in grate has a significant effect on pellet production and quality control, but the related work is scarce. A well-designed test was successfully carried out by means of tracking measurement and the temperature distribution and variation in pellet layers were obtained. The effects of blast temperature, blast velocity and oxidation reaction on the pellet layer temperature were studied. According to the analysis, the inlet air temperature in the up-draught drying zone (UDD) and blast temperature in the Preheating I (PH I) zone should be raised, and the length of the down-draught drying zone (DDD) should be properly increased.     

Humic Substance-based Binder In Iron Ore Pelletization: A Review

Due to the reducing ability and bonding effect, a humic substance-based binder has been added into iron ore pellets, both as a reductant and a binder. However, humic substance-based binders were not commonly used in pelletization since some pelletizing results indicated they were not as good asbentonite or other binders. Thus, there were few detailed investigations using humic substance-based binders in pelletization before the 1980s. Funa, which is a type of humic substance-based binder extracted from lignite, was successfully invented and applied in cold-bonded pellets in China. Since the organic fraction in the humic substance-based binder is burnt away during heating, leaving no contaminant in pellets and improving the iron content of the pellets, humic substance-based binders were also gradually utilized in oxidized pellets. On the basis of Funa binder research, the extracting procedure of a humic substance-based binder was modified, and a composite binder named Modified Humic Acid (MHA)was prepared for oxidized pellets, especially for making Vanadium-Titanium (V-Ti) magnetite pellets, and achieved qualified V-Ti magnetite oxidized pellets in industrial testing. The behaviors of humic substance-based binders in wet balls, dry balls and fired balls were well investigated. Moreover, MHA binder was gradually tested in a lab for pelletization of several other types of iron ore concentrates, such as magnetite from different districts, specularite and fluxed hematite, and good quality pellets were obtained. A review of the development of a humic substance-based binder and its characteristics, preparing method, and behaviors in pelletizing were considered in this paper.     

煤中氢对含碳球团还原的影响

针对含碳球团还原过程中的煤种选择问题,研究了烟煤和无烟煤挥发分中氢对含碳球团还原的作用以及温度、加热速度对氢还原过程的影响。结果表明,含碳球团中煤热解产生的氢对铁氧化物有还原作用。由于煤中挥发分的热解析出温度与氢还原铁氧化物的还原温度不一致,氢在还原初期迅速放出,导致氢的还原作用率低;提高温度和加热速度可提高煤中氢的还原作用率和挥发分的利用率。综合考虑,含碳球团实际生产选择煤种时,应选择反应性好的无烟煤。     

微波加热还原含碳铁矿粉试验研究

微波是一种清洁能源,可以对冶金粉料进行选择性体加热。利用含碳铁矿粉自还原性和对微波的吸收性,采用微波加热,可以直接进行碳热还原。微波加热可以快速提高含碳铁矿粉的金属化率,降低还原反应温度,对原料有广泛的适应性,并可以取消球团的制备工艺,对“绿色”钢铁冶金流程具有深远的意义。     

Carbothermal Reduction of Iron Ore Applying Microwave Energy

This paper presents the results of a study on carbothermal reduction of iron ore made under the microwave field in equipment specially developed for this purpose. The equipment allows the control of radiated and reflected microwave power, and therefore measures the microwave energy actually applied to the load in the reduction process. It also allows performing energy balances and determining the reaction rate with high levels of confidence by simultaneously measuring temperature and mass of the material upon reduction with high reproducibility. We used a microwave generator of 2.45 GHz with variable power up to 3000 W. Self‐reducing pellets under argon atmosphere, containing iron ore and petroleum coke, with 3.5 g of mass and 15 mm of diameter were declined. We obtained the kinetic curves of reduction of iron ore and of energy consumption to the process in the maximum electric field, in the maximum magnetic field and at different values of power/mass. The data allow analyzing how the microwave energy was actually consumed in the reduction of ore.