高钛球团焙烧行为及其强化技术

研究了高钛球团的焙烧特征和固结行为.随着TiO2含量的增加,球团焙烧难度增大,当TiO2质量分数由10%增加至21%时,高钛球团所需预热时间由12 min延长至26 min以上,焙烧球强度由每个2486 N降低至每个1728 N.高钛球团由于FeTiO3含量高,导致氧化速度慢、预热球氧化程度低,不利于焙烧固结时钛赤铁矿固溶体晶粒的长大,使得球团固结强度差.通过添加NaOH结合润磨工艺增大颗粒表面能和反应活性,促进了固相扩散,并生成少量低熔点化合物,有利于再结晶过程的扩散迁移,使Ti富集在Fe2 TiO5中并促进钛赤铁矿晶粒长大,强化了高钛球团焙烧固结,可使预热时间缩短至16 min,球团强度提高至每个2141 N.     

宣钢竖炉球团适宜膨润土配比试验研究

为了探求宣钢球团矿适宜膨润土的配比,进行了一系列的实验室研究。结果表明:膨润土配比控制在2.1%时,球团矿性能满足生产要求且经济合理。     

Development of carbon composite iron ore micropellets by using the microfines of iron ore and carbon-bearing materials in iron making

Iron ore microfines and concentrate have very limited uses in sintering processes. They are used in pelletization; however, this process is cost intensive. Furthermore, the microfines of non-coking coal and other carbon-bearing materials, e.g., blast-furnace flue dust (BFD) and coke fines, are not used extensively in the metallurgical industry because of operational difficulties and handling problems. In the present work, to utilize these microfines, coal composite iron oxide micropellets (2-6 mm in size) were produced through an innovative technique in which lime and molasses were used as binding materials in the micropellets. The micropellets were subsequently treated with CO₂ or the industrial waste gas to induce the chemical bond formation. The results show that, at a very high carbon level of 22wt% (38wt% coal), the cold crushing strength and abrasion index of the micropellets are 2.5-3 kg/cm2 and 5wt%-9wt%, respectively; these values indicate that the pellets are suitable for cold handling. The developed micropellets have strong potential as a heat source in smelting reduction in iron making and sintering to reduce coke breeze. The micropellets produced with BFD and coke fines (8wt%-12wt%) were used in iron ore sintering and were observed to reduce the coke breeze consumption by 3%-4%. The quality of the produced sinter was at par with that of the conventional blast-furnace sinter.     

粘结剂对球团性能的影响分析

分析了无机、有机及无机／有机复合粘结剂对球团性能的影响,同时讨论了结剂粘度和配量与球团性能指标的关系,并指出了各类粘结剂的优缺点。     

程潮铁精矿球团质量影响因素分析

以程潮铁精矿为原料进行造球试验,考察铁精矿粒度、膨润土种类及配比、造球水分和造球时间对球团质量的影响。结果表明,这几种因素对生球的落下强度、抗压强度和爆裂温度均有很大的影响;当程潮铁精矿中-0.074mm粒级含量为85.10%、膨润土A配比为1.5%、造球水分为8%、造球时间为12min时,能得到生球落下强度为9.8次/(0.5m) 、抗压强度为20.5N/个、生球爆裂温度为467℃的优质球团矿。     

Grate-kiln pelletization of Indian hematite fines and its industrial practice

Indian hematite fines normally have a high iron grade and minor impurities; they are usually used as sinter fines for feeding into a blast furnace. In this work, the grindability properties of two kinds of Indian hematite fines and the roasting behaviors and induration characteristics of pellets made from these fines were revealed through experiments involving dry ball milling and small-scale and pilot-scale tests. In addition, the microstructures of the particles of ground India hematite fines and fired pellets were investigated using optical microscopy. On the basis of the results, a grate-kiln production line with an annual output of 1.2 Mt of oxidized pellets was established in India. This pellet plant operates stably and reliably, further confirming that preparing high-quality pellets with Indian hematite fines pretreated by dry ball milling is an industrially feasible process.     

新型电石成型原料研究

通过分析生石灰的消化曲线和热失重曲线,提出了合理的电石成型工艺.根据电石成型原料对粘结剂的要求,研制出ZJ型复合粘结剂并分析了粘结功效及机理.结合现场的生产要求,通过大量实验与分析,给出了合理的成型加水量、成型压力和养护龄期.     

球团竖炉结构参数影响炉内气体流动的数值模拟

运用气固填料床动力学理论建立了球团竖炉料层内气体流动的数学模型，确立了数学模型的边界条件.运用手编程模拟研究炉内气体流动的基本规律，进而探讨竖炉结构参数对炉内气体流动的影响.结果表明:结构参数中，导风墙宽度、焙烧带宽度以及预热焙烧带高度是影响炉内气体流动的主要因素.导风墙宽度和预热焙烧带高度的增加，以及焙烧带宽度的减小会导致冷却风上行趋势减小，焙烧风下行趋势增大.同时，导风墙宽度、预热焙烧带高度以及焙烧带宽度的改变也会导致竖炉内焙烧风与冷却风之比发生改变，即流入风量比发生改变，而流入风量比是决定炉内气体流动的最主要因素.     

自产精矿对酒钢竖炉球团的影响

为解决酒钢竖炉球团生产用原料紧张问题，在实验室系统研究了配加自产精矿后对酒钢竖炉球团的影响。通过试验研究发现，酒钢竖炉球团配加部分自产精矿是可行的，但自产精矿配比应控制在20％以内     

ISP法冶炼浮渣热压团

在用ＩＳＰ法冶炼浮渣热压团时,研究了压团压力、温度、加压时间对铅锌密闭鼓风炉冶炼浮渣热压团块强度的影响．结果表明：压力对团块强度影响不大;温度是影响热压团的重要因素;加压时间对热压团的影响具有双重性;制粒有利于团块强度的提高和压团温度的降低．热压团块在９００ ℃的温度下具有一定的抗压强度．该工艺对扩大密闭鼓风炉冶炼的备料方式,改善冶炼方法及治理环境具有重要意义．