浅议安钢烧结发展和技术进步

通过安钢股份公司烧结厂的烧结矿产量、烧结机机型、烧结矿指标的变化,对安钢烧结行业的发展进行了大致描述,对安钢烧结生产的技术进步进行了简要介绍,指出了安钢烧结矿产品质量的不断提高和烧结设备大型化是近年来安钢烧结产业发展的主要特征。     

AN IMPROVEMENT ON SINTER QUALITY OF BAOTOU IRON ORE CONCENTRATE

本文对包头精矿烧结矿的宏观结构、微观结构及矿物组成进行了岩相及矿相研究,并对其中的稀土矿物等进行了电子探针分析,对烧结矿中主要胶结相矿物——枪晶石进行人工合成,测定了枪晶石的抗压强度及耐磨性. 试验研究了硅(SiO_2),氟(CaF_2)对包头精矿烧结矿强度的作用机理,测定了随着烧结矿中Si、F_2含量的变化与其液相性质——粘度及表面张力的关系,以及对烧结矿结构及强度的影响. 试验证明,精矿中的F_2是影响烧结矿强度的主要因素,其次是Si低胶结相量少,枪晶石的抗压强度低耐磨性差也是影响烧结矿强度的一种因素. 根据实验结果提出了改进包头精矿烧结矿质量的措施,并在生产中获得成功的应用.     

功能梯度硬质合金球齿的研制

作者对含 η相的烧结体的碳含量、其高温渗碳时间、温度以及烧结体本身尺寸大小对无 η相区的厚度和钴梯度形成的影响进行研究。结果表明 :烧结体的碳含量必须足够低 ,才能使烧结体中间形成富钴层 ;提高渗碳温度有利于液相钴向烧结体内部迁移 ;对尺寸大小不同的烧结体 ,应选择不同的渗碳时间     

FeO对烧结矿矿物组成和显微结构影响的研究

应用鞍钢现有的矿石原料及辅助材料,通过改变配碳量使烧结矿中FeO发生变化,其它化学成分保持不变;利用矿相学研究手段分析了FeO的变化对烧结矿的矿物组成和显微结构的影响,并从矿相学的角度提出了鞍钢在现有原料条件下生产烧结矿中FeO的适宜值。     

澳大利亚FMG粉矿烧结性能的试验研究

澳大利亚FMG粉矿属于褐铁矿,储量大且单烧品位高,提高其在烧结中的比例是企业降低生产成本的有效措施之一。烧结杯试验研究表明:FMG粉矿与结构致密的巴西CVRD粗粉、南非粉等进行合理搭配,选择适宜的工艺操作参数,通过实施高碱度厚料层、添加蛇纹石等工艺技术措施,更有利于改善FMG粉矿的烧结性能,在生产中大比例配加FMG粉矿是可行的。     

用200nm铜颗粒在空气中快速压力辅助烧结及连续无压退火提高结合强度

为了设计一种有效且适用于功率器件的烧结结合工艺,提出一种两步工艺,使用约200 nm的铜颗粒基浆料形成具有高温可持续性和优越导热性的粘结层.该工艺涉及在空气中快速压力辅助烧结和在氮气气氛中连续无压退火.当使用20％(质量分数)的羟基丁二酸和80％(质量分数)的乙二醇混合物浆料时,在300℃、5 MPa烧结30 s后的剪...     

镗杆与镗套烧结原因分析及预防措施

文章针对组合镗床在使用初期极易造成镗杆和镗套"烧结抱死",又难于修复的问题,从设计制造、润滑密封、使用操作等不同方面详细分析了易"烧结抱死"的形成原因,并针对"烧结抱死"的成因提出了多种预防措施,经过实际生产验证,采取这些措施后可避免烧结的各种诱因发生,是解决镗杆和镗套易"烧结抱死"问题的有效方法,能够保证组合镗床在使用初期以及后续使用过程中,不会因各种不良诱因而导致设备瘫痪.     

气压烧结硬质合金性能的研究

选用一定条件的WC粉和Co粉,生产YG6、YG11、YG8顶锤3个牌号硬质合金试样．采用气压烧结和普遍真空烧结,对两种工艺进行对比,结果表明：气压烧结硬质含金孔隙等缺陷显著降低;密度、强度等物理性能大大提高,低粘合金更为明显,气压烧结硬质合金的磁力、Co磁更为均匀,组织更细。     

Thoughts on lead blast-furnace smelting

On the basis of limited experimental work conducted at the Port Pirie smelter, it would appear that, by increasing the specific surface of sinter, and possibly that of coke as well, a marked increase in the rate and degree of sinter reduction in the furnace shaft can be achieved. Fusion-point tests have shown that this increased reduction means a much higher sinter fusion point and narrower plastic zone, while the more efficient utilization of coke in the furnace is inherent in the intensification of reduction by the provision of a more reactive sinter surface. Investigations aimed at increasing the ability to operate the blast furnace with a higher lead tenor of sinter reducing fuel cost proportionately, and at eliminating the loss in reduction potential in coke entering the furnace, as shown by the presence of appreciable proportions of CO in the top gases, are reported. Several lines for future investigations that could result in improved smelting methods are proposed.     

Phase Evolution in Boride-Based Cermets and Reaction Bonding onto Plain Low Carbon Steel Substrate

Reaction sinter bonding is a process that aims to bond two materials for improvement in properties through reactive sintering technique. The process has been effectively used to sinter hard materials like borides in situ which not only possess excellent oxidation resistance, good corrosion resistance but also resistant to abrasive wear. Sinter bonding is a unique surface modification process achieved through powder metallurgy and is competent with other techniques like boronizing sintering and sinter-brazing since it eliminates the additional operations of heat treatment and assembly and removes the inherent setbacks with these processes. This study focuses on identifying the phase evolution mechanism using characterization tools like x-ray diffractometry and energy dispersive spectroscopy and study of sinter bonding of the boron containing precursors (Mo-Cr-Fe-Ni-FeB-MoB) onto plain carbon steel. A microstructure containing Fe-based matrix dispersed with complex borides develops with temperature in the tape cast sheets. A fivefold increase in hardness between plain carbon steel in wrought condition and sinter bonded steel was observed. The multilayer consisted of a reaction zone adjacent to the interface and was investigated with the composition profile and hardness measurements. A model of sinter bonding between the cermet and the steel has also been proposed.     

Effect of Sinter Mix Composition and Additives on the Quality of Blast Furnace Sinter

Effect of variations in sinter feed composition on sinter strength, bulk density, re-ducibility, chemical composition, and microstructure were determined by sintering experimental samples on a production sintering machine. Increasing amounts of roll scale, ore fines, return fines, and blast furnace slag were most beneficial to feed permeability, sinter bulk density, and strength. Burnt lime additions improved feed permeability but were not beneficial to sinter strength or bulk density. Sinter reducibility was adversely affected by all additives.     

强化烧结熟料溶出中赤泥的快速分离

通过对比传统沉降分离和机械离心分离在强化烧结熟料溶出中的分离效果,结合机械离心分离的工业试验特点．提出机械离心分离熟料溶出浆液是目前解决赤泥快速分离、烧结法溶出粗液进一步提高浓度的有效办法。是实现烧结法熟料高浓度溶出的关键一步。     

二次温压对铜粉和镍粉反应的影响

研究了铜和镍混合粉经冷压和一次冷压、二次温压两种压制方法成型后的烧结体的显微组织以及密度和硬度。结果发现，在铜粉和镍粉反应过程中，二次温压对烧结体显微组织、密度和硬度有重要的影响。二次温压较冷压有利于Cu-Ni单相固溶体的形成，可以提高铜粉和镍粉烧结体的密度和硬度。     

高A/S低[F/A]熟料添加矿化剂降低烧成温度试验研究

针对熟料氧化铝含量提高、氧化铁含量降低以后,烧成温度升高这一难题,探索采用添加矿化剂CaF2的方法降低烧成温度的可行性.进行了不同添加量的烧结试验,对高铝熟料的烧结性能有了更深刻的认识,并在试验室条件下进行了溶出及赤泥沉降性能试验.为氧化铝含量大干40%的熟料的烧结找到了一种降温用矿化剂.     

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为了提高镍渣利用效率,进行了金川镍渣3种配比（全镍渣,镍渣：红土矿为7∶3,镍渣：红土矿为5∶5）的烧结杯试验,并对试验结果进行了分析。试验表明：采用全镍渣进行烧结,控制适宜条件,即焦粉配比为8%左右,混合料水分质量分数为3.5%-4.5%,烧结矿可满足要求;配入红土矿可进一步提高烧结矿各项指标;且随着红土矿配比的增加,应增大配炭量和混合料水分。     

Die sinter bonding in air using copper formate preform for formation of full-density bondline

Pressure-assisted sinter bonding was performed in air at 250?350 °C using a preform comprising copper formate particles to form a bondline that is sustainable at high temperatures. H₂ and CO generated concurrently by the pyrolysis of copper formate at 210 °C during the sinter bonding removed the native oxide and other oxides grown on bulk Cu finishes, enabling interface bonding. Moreover, Cu produced in situ by the reduction of Cu(II) accelerated the sinter bonding. Consequently, the bonding achieved at 300?350 °C under 5 MPa exhibited sufficient shear strength of 20.0?31.5 MPa after 180?300 min of sinter bonding. In addition, an increase in pressure to 10 MPa resulted in shear strength of 21.9 MPa after an extremely short time of 30 s at 250 °C, and a near-full-density bondline was achieved after 300 s. The obtained results indicate the promising potential of the preform comprising copper formate particles for high-speed sinter bonding.     

Behavior of calcium silicate in leaching process

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 烧结机漏风是烧结厂的棘手问题，由于漏风导致烧结矿产量降低、质量下降、反矿增多；设备磨损严重；能耗升高等。针对这一问题提出了新的密封结构——高负接触头尾密封装置、无铆接双板簧和新的传动方式——星轮传动的变齿距设计以及增设尾部液压阻尼装置。在现场实施后证明是行之有效的，烧结机总漏风率下降了27%。     

Cr-RE共掺杂WC-Co合金烧结体表面RE_2S_3和RE_2O_2S相的原位形成(英文)

采用扫描电镜、能谱仪以及X射线衍射仪对具有WC+β(β为钴基粘结相)两相结构的WC-11Co-0.71Cr3C2-0.06RE(RE为含La、Ce、Pr、Nd的混合稀土)硬质合金烧结体表面进行观察与分析。结果表明,在烧结过程中合金中的La、Ce、Pr、Nd通过定向迁移与烧结炉内气氛中的S、O等杂质元素结合,在合金烧结体表面形成RE2S3(主)和RE2O2S(少量)弥散相。从合金中Cr3C2的热力学稳定性、Cr在Co中的溶解度特性以及稀土原子激发等3个方面,对稀土迁移活性的激发机制和稀土原子的定向迁移机制进行分析与讨论。     

低压烧结对硬质合金机械性能的影响

近年来，低压烧结硬质含金技术得到了迅速发展与应用．与高任热等静压相比具有成本低，能耗少的优点，且合金组织结构均匀，机械性能优于热等静压合金。本文就两种工艺进行了对比试验，结果表明，低压烧结硬质合金是提高产品质量的有效方法。