关于昆钢烧结矿低温还原粉化率（RDI）与矿相组成及结构关系的研究报告

介绍了昆钢一、二烧和三烧的烧结矿相组成和结构的不同。探讨了昆钢烧结矿低温粉化的成因，及烧结矿中各种矿相成分，Ａｌ２Ｏ３含量等对ＲＤＩ的影响，分析了烧结矿还原度，低温还原粉化率和ＦｅＯ含量三者的辨证关系，并提出了当前改善烧结矿低温粉化性的方法。     

高铅烧结矿的升温还原和高温性能

为调查Ａｌ２Ｏ３对烧结矿的还原少高温性能的影响,对不同Ａｌ２Ｏ３含量的烧结矿进行加热还原。调查了高铝烧结矿的初始软化温度和压损。同时用Ｘ射线观察了还原过程,用ＥＰＭＡ和ＳＥＭ分析了冷却后的试样,发现高铝烧结矿在还原初始阶段存在大量的ＦｅＯ－２ＣａＯ·ＳｉＯ２·Ａｌ２Ｏ３共晶相。高铝烧结矿在较低温度下会产生大量的富Ａｌ２Ｏ３熔融相。     

铝电解质晶相组成研究

应用ＸＲＤ和ＩＲ研究凝固铝电解质的晶相组成，添加剂ＣａＦ＿２、ＭｇＦ＿２和锂盐在电解质中的化学反应和生成物。结果表明，ＣａＦ＿２在碱性和酸性电解质中均呈稳定相；ＭｇＦ＿２生成ＮａＭ－ｇＦ＿８；在酸性电解质中锂盐反应生成ＬｉＮａ＿２ＡＩＦ＿６；在酸性电解质和上述添加剂条件下，体系由Ｎａ＿２ＡＩＦ＿６－Ｎａ＿５Ａｌ＿３Ｆ＿（１４）－ＬｉＮａ＿２ＡＩＦ＿６－ＮａＭｇＦ＿３－ＣａＦ＿２－Ａｌ＿２Ｏ＿３组成。依据电解质相组成，研究了电解质酸度的计算。     

氯化物对烧结矿RDI影响的试验研究

介绍了在烧结矿表面喷洒ＣａＣｌ２等稀溶液以降低宝钢烧结矿ＲＤＩ指数的实验室试验研究，以及在烧结混合料中添加少量ＣａＣｌ２烧结的试验研究结果。     

添加Cu元素对Al／Al2O3复合材料力学性能的影响

探讨了热压烧结制备Ａｌ／Ａｌ２Ｏ３复合材料的可能性。用ＳＥＭ和ＸＲＤ分析了添加５％Ｃｕ后复合材料界面的组织结构和相组成，研究了铜对材料硬度和耐磨性的影响，研究表明，Ｃｕ元素的加入可以明显提高复合材料的力学性能，同时可以使Ａｌ２Ｏ３的加入量显著提高。     

喷洒CaCl2溶液降低烧结矿RDI有效期的试验研究

通过对喷洒过ＣａＣｌ２溶液的烧结矿经浸泡和淋雨后的低温还原粉化试验,一方面研究了落地烧结矿表面氯化钙的有效期问题;另一方面也结合试验数据和烧结矿低浸粉化的机理,探讨了烧结矿喷洒ＣａＣｌ２溶液后其ＲＤＩ降低的机理。     

氧化铝水合物中的Na2O在煅烧过程的行为

Ｎａ２Ｏ含量是非冶金级Ａｌ２Ｏ３的重要技术指标。本文应用Ｄ／Ｍａｘ－３ＢＸ射线衍射，ＩＲ－４４０红外光谱法研究了赋存于氧化铝水合物中的Ｎａ２Ｏ在煅烧过程中的行为，β－Ｎａ２Ｏ·Ａｌ２Ｏ３随温度升高而分解，最终是α－Ａｌ２Ｏ３与Ｎａ２Ｏ·１１Ａｌ２Ｏ３共有。氧化铝水合物中的Ｎａ２Ｏ含量增加，煅烧产品的α－Ａｌ２Ｏ３含量减少、比表面积降低。研究结果对生产及应用Ａｌ２Ｏ３的行业均有益。     

Al2O3加剧烧结矿低温还原粉化原因的研究

用微型烧结试验装置研究了Ａｌ２Ｏ３加剧烧结矿低温还原粉化的原因，在立式电炉中焙烧烧结小饼，采用光学显微镜和扫描电镜－能谱仪等手段对烧结饼进行检测，研究得出，Ａｌ２Ｏ３促使Ｆｅ２Ｏ３的还原应力集中及膨胀裂纹扩展，从而加剧烧结矿的膨胀粉化。     

三氧化二铝对澳矿烧结性能的影响

通过实验室试验确定了由Ａｌ２Ｏ３含量不同的矿石生产的烧结矿性能。所用的铁矿是西澳大利亚纽曼山矿产有限公司的瓦列拜克矿山的矿石，Ａｌ２Ｏ３在矿石中以高岭土形态存在，所生产的熔剂性烧结矿的碱度为１．７，Ａｌ２Ｏ３含量为２．０％－２．８％，对该烧结矿进行了转鼓强度，低温还原粉化和还原性能等试验。     

镍基合金──ZrO_2·Y_2O_3倾斜功能材料的研究

镍基合金──ＺｒＯ＿２·Ｙ＿２Ｏ＿３倾斜功能材料的研究ＴＨＥＳＴＵＤＹＯＦＮｉ－ＢＡＳＥＤＡＬＬＯＹ－ＺｒＯ＿２·Ｙ＿２Ｏ＿３ＦＵＮＣＴＩＯＮＡＬＬＹ．ＧＲＡＤＩＥＮＴＭＡＴＥＲＩＡＬ摘自冶金部钢铁研究总院研究生曹铁柱的硕士学位论文，导师：李世英、陆...     

Correlating mechanical properties of sinter phases with their chemistry and its effect on sinter quality

In this study, pot sinter tests were carried out to study the sintering properties of iron ores of different alumina (2–4–6%) level. It was observed that the 6% alumina level ores have a higher RDI values and decreased tumbler index (TI) compared to its other two counterparts. It was observed that an increase in composite fracture toughness (CFT) of sinter improves the Tumbler as well as RDI of the sinter. Beyond 4 CFT there is remarkable improvement in TI, RDI and RI values. The mechanical strength parameters of sinter phases were further correlated and analysed with respect to the chemistry of sinter and mineralogy of sinter phases. There is strong evidence which suggests that the Al₂O₃ deteriorates the strength of the phases by making them hard and thus generating cracks in them. Unlike alumina, CaO and SiO₂ tend to stabilise and improve the strength of the phase.     

Effect of Sulfur Contents on Fracture Toughness of Wheel Steels for High Speed Train

The effect of different contents of S on fracture toughness of railway wheel steels for high speed train has been researched.The results show that there are kinds of non-metallic inclusion when O content retaining at about 10×10-6,such as Al 2 O 3 inclusions and Al 2 O 3 +MnS complex inclusions and single MnS inclusions.This is connected with S content level in steel.Fracture toughness of railway steel increase obviously because of Al 2 O 3 covered by MnS around when S content is increase to about 70×10-6.It shows that,after Al 2 O 3 covering by MnS around,stresses around complex inclusion decrease rapidly till disappear when analyzed by tessellated stresses theory.That is the reason of fracture toughness rise.     

氧化铝基氧化物/氧化物复合材料的合成与评价

Al2O3 matrix oxide/oxide composites containing rod-like Ba-β-Al2O3 and equiaxed ZrO2 particles have been successfully synthesized by an in-situ process from a mixture of Al2O3 and BaZrO3 powders.The long-axis direction of rod-like Ba-β-Al2O3 phase is parallel to ,while the longitudinal interface between Ba-β-Al2O3 phase and Al2O3 matrix is parallel to(0001) of the Ba-β-Al2O3 phase.The mechanical properties of the composites,such as Vickers hardness and fracture toughness,are enhanced with increasing the sintering temperature.Furthermore,the presence of rod-like Ba-β-Al2O3 particles results in enhancement of fracture toughness of the in-situ synthesized composites due to crack deflection and crack bridging.     

铝酸钠粗液氧化铝浓度对熟料溶出过程的影响

以脱硅粉煤灰熟料为原料进行熟料溶出,控制液固比得到不同氧化铝浓度的铝酸钠粗液,通过分析上述粗液在不同溶出时间溶液成分及固相成分的变化规律,研究溶出过程发生的二次反应历程。结果表明,随着氧化铝浓度的升高、溶出时间的延长,铝酸钠溶液中的氧化铝浓度和氧化硅浓度大致呈下降趋势;固相中氧化铝和氧化钠含量呈上升趋势,熟料氧化铝溶出率和氧化钠溶出率呈逐渐下降趋势。对于原硅酸钙含量大于50%的脱硅粉煤灰熟料而言,建议将铝酸钠粗液氧化铝浓度控制在100~120g/L,熟料溶出后浆液的液固分离时间控制在180min以内。在不同初始氧化铝浓度条件下,随着溶出时间的延长,二次反应产物及反应历程随着氧化铝浓度的变化而变化。溶出固相的主要产物为水化石榴石、钠硅渣、原硅酸钙和少量方解石。     

w(MgO)和w(Al2O3)对混合炉料软熔性能的影响

 改善高w（Al2O3）矿石冶炼的常用方法是增加烧结矿w（MgO），则高碱度烧结矿中w（MgO）和w（Al2O3）均升高且w（MgO）/w（Al2O3）改变。为降低冶炼成本，需合理调控高炉综合炉料的w（MgO）和w（Al2O3）。以现场烧结矿和天然块矿为试验原料，考察了烧结矿中w（MgO）和w（Al2O3）均增加的条件下混合炉料软熔性能的变化规律，结合相图和X射线衍射分析w（MgO）和w（Al2O3）的影响机制。结果表明，随着烧结矿中w（MgO）和w（Al2O3）增加，混合炉料软化特征温度降低；渣相熔化温度和黏度下降引起混合炉料的熔化特征温度降低，添加MgO能改善高Al2O3炉料的软熔性能，达到适宜的 w（MgO）/w（Al2O3）即可。     

Al2O3质量分数对高碱度烧结矿软熔滴落性能影响

 对Al2O3质量分数不同的高碱度烧结矿进行了荷重软化熔滴试验,并通过对不同温度下烧结矿微观结构和矿物组成的分析,进行了Al2O3质量分数对烧结矿软熔滴落性能影响机制的探讨。试验结果表明：Al2O3质量分数增加促进了还原过程中钙铝黄长石(2CaO·Al2O3·SiO2)和浮士体共晶相(2CaO·SiO2-2CaO·Al2O3·SiO2-FeO)等低熔点富铝相的生成,导致高Al2O3烧结矿在较低温度下出现开气孔孔隙封闭,从而降低了压差陡升温度。在熔融滴落阶段,高Al2O3烧结矿中渣相的Al2O3质量分数较高。存在于金属铁颗粒之间渣相的液相线和黏度随Al2O3质量分数增加而提高,在一定程度上降低金属铁颗粒的聚合,使得烧结矿的滴落温度提高。同时,高Al2O3烧结矿具有较宽的熔滴区间,使得熔融滴落区间的透气性较差。     

某含钛铁砂烧结行为实验研究

通过烧结杯试验,结合烧结矿冶金性能检测和矿相分析,对某含钛铁砂的烧结行为进行了研究。结果表明,随着该含钛铁砂配比增加,烧结利用系数和烧结矿转鼓强度下降;冶金性能方面,烧结矿低温还原粉化性能出现了大幅度恶化,烧结矿熔滴性能得到改善。根据矿相观察结果,烧结指标恶化的主要原因之一是由于含钛矿物导致烧结液相过热度降低,促进了烧结玻璃相的生成,抑制了铁酸钙相的结晶和析出。综合实验室结论,建议该含钛铁砂在混合料中配加比例控制在5%以内,并配合喷洒CaCl2措施以减少其对烧结矿低温还原粉化性能的影响。     

Introduction and prospect of pre- reduction- cooling sinter by metallurgical gas

According to the research progress of low temperature reduction degradation index (RDI) of sinter at home and abroad, and drawing on the vertical tank type waste heat recovery device, a new process of pre- reduction- cooling sinter in the shaft furnace using metallurgical gas was proposed. The process utilizes metallurgical gas to pre- reduction and cool the high- temperature sinter, which can greatly improve the RDI of the sinter in the blast furnace, and at the same time achieve the efficient utilization of the residual heat of the sinter. The results show that, with the decreasing of sinter cooling rate, Fe2O3 in sinter gradually disappears, FeO content gradually increases, RDI+6. 3 and RDI+3. 15 of sinter significantly increase, and RDI-0. 5 gradually decreases. The research results propose key issues to be solved in order to realize the application of the process in production practice.     

Effect of CaCl_2 on RDI and RI of Sinter

 On the premise of maintaining the reducibility of sinter unchanged, it is of great significance to reduce the RDI of sinter, which will improve the permeability of blast furnace burden column, so as to realize stable and smooth performance, and keep high yield and low consumption. Under laboratory conditions, a study was proposed on the RDI and RI of sinter, which was immersed with different types and concentrations of solutions. The results show that Cl- is the main factor for reducing the RDI of sinter, and the RDI and RI of sinter decrease with the increase of Cl- concentration. With comprehensive consideration of the RDI and RI of sinter, when the concentration of Cl- is 2%, the RDI of sinter will be significantly reduced and RI will not be affected. In order to study the mechanism of CaCl2 effect on the RDI and RI of sinter, analysis based on the methods of IR Spectra, SEM and chalcography was adopted.     

Effect of Hydrogen Addition on Low Temperature Metallurgical Property of Sinter

 Abstract： Hydrogen-enrich iron making process is certainly to be an effective method to reduce greenhouse gases emission. However, the effect of hydrogen addition on the low temperature metallurgical property of sinter is still unclear. A detailed investigation was performed on the above topic. The results are as follows. When CO is partially replaced by H2, the RDI＜315 (RDI＜28) of sinter decreases with the increase of the H2 content; when the content of H2 increases, the CO, CO2 and N2 decrease proportionally, in this case, RDI＜315 (RDI＜28) of sinter increases with the increase of H2 content; the value of RDI＜315 (RDI＜28) basically depends on the reduction index (Ri).The experimental data of RDI＜28 based on Japanese industrial standard (JIS) are a little higher than the data of RDI＜315 based on Chinese industrial standard (CIS) in the same condition. In addition, for part of CO is replaced by H2: RDI＜28=338394+11585 RDI＜315; for other gases, except H2, are decreased proportionally: RDI＜28=1739678+042922 RDI＜315.