电熔铝镁铬在透气座砖浇注料中的应用研究

为提高透气座砖浇注料的使用性能,分别用5~3、3~1、1~0和≤0.074mm的电熔铝镁铬代替浇注料中相应粒度的板状刚玉颗粒,研究其对浇注料的常温强度、致密度、热震稳定性和抗渣性的影响。结果表明:(1)电熔铝镁铬与板状刚玉骨料1∶1比例复合时,试样的气孔率最低,体积密度最高,常温强度最大;(2)板状刚玉完全被电熔铝镁铬替代时,试样的抗渣性最好。综合考虑,当电熔铝镁铬与板状刚玉骨料1∶1比例复合时,试样的综合性能最好。     

全LF炉精炼工艺钢包用刚玉——氧化镁砖的研究

首钢第二炼钢厂的研究人员通过分析某钢厂LF炉熔渣特点和包壁砖的侵蚀机理，研制出了一种性能优良的刚玉——氧化镁砖以替代铝镁碳砖。试验采用棕刚玉、亚白刚玉、板状刚玉、氧化铝微粉和电熔镁砂为原料，经过粉料预混均匀，混料、成型。     

铬刚玉透气砖的研制

以烧结板状刚玉为主要原料，加入微粉和添加剂，制成狭缝式铬刚玉透气砖，结果表明，该砖理化指标和使用效果都较好，完全可以满足钢厂炼钢吹氩工艺要求。     

板状刚玉在钢包无水泥干式喷补料中的应用

板状刚玉具有高纯、低碱、高强度、高抗热震、耐侵蚀、体积稳定性好和极小的重烧收缩等特点.采用板状刚玉为主原料,并引入特殊氧化铝微粉,研制出无水泥铝镁干式喷补料.因其卓越的耐用性能,不仅可延长钢包使用寿命,在某种程度上,可局部的或可全面的取代套浇并改变钢包的修护模式.这将对钢包不定形化带来革命性的变化.     

精炼钢包用刚玉质无碳预制块砖的研制与应用

以电熔白刚玉、板状刚玉、电熔镁砂、氧化铝微粉、富铝尖晶石微粉等为主原料，研制开发了自结合铝镁（铬）浇注料预制块砖。该预制块砖比传统的钢包浇注料具有更好的抗渣侵蚀和抗剥落性能。在RH精炼钢包上使用渣线平均蚀损0.4毫米／炉、包衬平均蚀损0．31毫米／炉、包底平均蚀损1．68毫米／炉；在LF精炼钢包上使用包壁平均蚀损0．6毫米／炉。     

新型快干浇注料的研制和应用

以硅溶胶作为结合剂,以电熔板状刚玉、莫来石为骨料,以白刚玉粉、活性α-Al2O3,微粉、莫来石粉为细粉,配以固化剂、添加剂加以调整,研制出一种新型快干浇注料.因其优异的物理性能,特别是其体积稳定性(抗爆裂、剥落)和快速烘烤的特性,在不影响炉衬正常运行的前提下,成功实现了浇注料炉衬浇注施工后12 h养护脱模、24 h烘炉...     

尖晶石对刚玉-尖晶石浇注料性能的影响

以板状刚玉(6 mm～1 mm、1 mm～0.5 mm、0.5 mm～0mm)、烧结尖晶石颗粒(1mm～0.5 mm)为骨料,电熔尖晶石细粉(≤0.044 mm)、白刚玉细粉(≤0.044 mm)、α- Al2O3微粉(≤5μm,d50=2.01 μm)、纯铝酸钙水泥为基质,按骨料与基质的质量比为70∶30配料,以烧结...     

电熔MgO及MAT细粉对刚玉质材料性能的影响

以电熔刚玉、电熔MgO及电熔MgO-Al2O3-TiO2细粉为原料,实验并研究了电熔MgO及电熔MgO-Al2O3-TiO2细粉的添加对刚玉质材料性能的影响.结果表明,经中、高温热处理后,添加MgO-Al2O3-TiO2细粉的刚玉质浇注料的各项性能明显好于添加MgO细粉的刚玉质浇注料.     

α-Al2O3在耐火材料中应用性能的研究

通过对添加不同微晶活性α—Al2O3所获得的耐火浇注料之烘干强度和烧结后强度的实验数据对比，可知微晶活性α—Al2O3微粉用于耐火材料的性能优于活性α—Al2O3微粉，其结论同样适用于板状刚玉的生产。     

不同刚玉骨料对刚玉尖晶石砖抗渣性能的影响

以白刚玉、板状刚玉、棕刚玉、镁铝尖晶石、氧化铝微粉为原料,分析了不同骨料加入对刚玉尖晶石砖抗LF炉渣侵蚀性能的影响。通过对比试样的抗LF炉渣侵蚀性能,结果表明,使用粒度3～1 mm的白刚玉和6～3 mm的板状刚玉作为骨料加入时,刚玉尖晶石砖的抗LF炉渣性能最优,且尖晶石与LF炉渣接触面易于形成固溶的保护层,从而减缓渣液向刚玉尖晶石砖本体内的渗透与侵蚀。     

氧化锌球团还原的机理研究

采用等温法研究了纯氧化锌配加石墨碳粉制成含碳氧化锌球团的还原动力学 ;考察了坩埚尺寸对氧化锌还原的影响 ;并研究了铝浴条件下对含碳或不含碳氧化锌球团还原的影响。结果表明 :根据Arrhenius方程计算出 ,当碳气化反应和界面还原反应为限制环节时 ,在 12 73～ 14 2 3K下其活化能分别为 3 7 615kJ/moL和 43 192kJ/moL ,碳还原氧化锌的还原速度由气相扩散所控制 ,12 73～ 14 2 3K下其活化能为 46 5 48～ 5 3 2 80kJ/moL ,含碳球团在大坩埚中的还原速度快 ,有铝浴存在的还原速度快 ;在 12 73～ 15 2 3K下铝浴与氧化锌球团 (不含碳 )基本不发生还原反应     

吸收三氧化二铝夹杂仪的研制及应用

吸收三氧化二铝夹杂仪是为了配合连铸结晶器保护渣和连铸中间包覆盖剂的研究面研制的,现已能满足冶金用渣实室测试的要求,测定结果与北京钢研总院和重庆大学的结果相比较数量级安全一致。     

孤立电网与组织硅铁冶炼的措施

通过孤立电网与硅铁冶炼的生产实践，阐述了孤立电网与冶炼的关系与电力系统限电避峰的异同。提出了在电网低周波、设备欠出力情况下组织生产的技术措施。     

Producing Metallic Antimony with Low Arsenic Content from Antimony Concentrate

The basis of the concentrate is sodium hexahydroxoantimonate or mineral mopungite. Upon reduction of the concentrate with coke, ground antimony containing 0.34% arsenic was obtained. To reduce the arsenic content in the rough metal to 0.1% and exclude the stages of antimony refining from arsenic, reductive melting is proposed in the presence of lead compounds. Because of the smelting reduction of the antimonate concentrate in the presence of sodium plumbite or lead oxide, a rough antimony with an arsenic content of 0.07–0.1% was obtained. The process of reductive smelting of the antimonate concentrate on black antimony was carried out in an oven with silicate heaters in alundum crucibles with batches of charge of 100–150 grams. The content of impurities and the base metal in antimony was determined by chemical and atomic absorption methods. The form of arsenic in the concentrate was determined by X-ray phase analysis. The analysis was carried out on an automated diffractometer DRON-3 with CuK_α radiation, ß-filter. The concentration of arsenic in the slag phase in the form of lead diarsenate Pb₂As₂O₇ is shown. Thermal gravimetric analysis of the smelting reduction process of the antimonate concentrate was studied on the Q-1000/D derivatograph of the F. Paulik, J. Paulik and L. Erdey systems of the “MOM” company. Thermogravimetric researches of process of recovery melting of the furnace charge consisting of an antimony concentrate, lead oxide and coke as a result of which it is established that process of formation of metal antimony proceeds in the range of temperatures 445–950°C are conducted.     

Features of interaction between copper melt and air oxygen after deoxidization

The dependence of the content of dissolved oxygen on the holding time of a copper melt after using various deoxidizers is investigated in laboratory conditions. It is established that, during smelting in alundum crucibles in air without protective coating, the saturation rate of the melt with oxygen is high. Among the studied deoxidizers, zirconium provides the most effective protection of the melt from air oxygen.     

Possibilities of intense resource saving in electric furnace steelmaking

The application of a secondary energy resource in the form of the heat of liquid steel is considered for melting metal scrap used in a charge in electric furnace steelmaking. Temperature-heat curves are plotted for cooling of steel and melting of metal scrap. The possibilities of using melted scrap in electric furnace steel-making are analyzed.     

低成本高寿命钢包用浇注料的研究与应用

莱钢炼钢厂选用高铝矾土熟料为骨料,镁砂粉、高铝矾土熟料细粉、刚玉细粉为基质研制开发了钢包浇注料,具有低成本、高寿命的特点,使用证明,钢包综合包龄在100炉次以上。     

Electric Melting of Iron-Ore Prereduced Pellets in an Electric Arc Furnace

This article discusses the aspects of the melting loss in electric steelmaking during continuous feeding of prereduced pellets into the bath of an electric arc furnace via hollow electrodes. It is shown that adjustment of the melting loss and the dust discharge from electric arcs by changing the pellet consumption and accounting for the heat parameters of furnace operation makes it possible to significantly increase the ingot-to-product yield during electric steelmaking.     

海绵铁的电炉冶炼

对鹿泉钢铁公司３ｔ电炉使用海失冶炼进行总结。通过１９９６年２月进行的４炉对比冶炼实验得出以下结论：小电炉使用３０－５０％海绵铁；总的冶炼周期缩短约２０％；电炉单位电耗减少１７－２７％，单位耗氧量降低４－２７％。电炉使用海绵铁做原料补充废钢的不足是必然的趋势。     

Ausmelt炉镍熔炼合理渣型的研究

金川集团公司沉降电炉弃渣有价金属含量高且熔化温度高。采用SEM-EDS与XRD确定了镍和铜在渣中的主要损失形式为夹杂或悬浮。测定了以Ausmelt熔炼渣为基础的半合成渣的熔化温度,研究了Fe/SiO2及CaO含量对半合成渣熔化温度的影响。结果表明,当Fe/SiO2=0.9～1.0且CaO含量为6%～10%时,渣的熔化温度明显降低,为Ausmelt炉镍熔炼工艺参数的优化提供参考。