连铸坯表面夹渣分析及预防措施

三角口裂纹、直线裂纹和渣孔是连铸坯表面夹渣的主要表现形式.通过金相观察、扫描电镜及电子探针分析了裂纹的形貌特征及夹渣的分布,夹渣的主要组成是高温氧化物,即FeO、MnO、SiO2和A12O3,是由结晶器保护渣形成的,渣圈是形成这种氧化物聚集带的原因.钻孔模拟试验表明,深度2 mm以内的渣孔轧制后不会形成裂纹.连铸坯表面夹渣可通过合理使用结晶器保护渣、保持结晶器内液面平稳、保持中间包水口对中、稳定拉速等措施加以控制.     

用磁选的方法从含钛高炉渣中回收碳氮化钛

采用冶炼钒钛磁铁矿产生的含TiO2 20%～26%的高炉渣为原料,通过对渣中的钛氧化物进行还原碳化和氮化处理生成碳氮化钛后,利用铁作为载体,用磁选的方法实现碳氮化钛和脉石矿物的分离.磁选后获得Ti(C,N)品位大于36.46%,回收率达到43.77%的碳氮化钛精矿.     

高炉渣余热回收探讨

分析了目前中国钢铁企业的炼铁环节炉渣余热回收方法及其存在的问题,提出其中存在问题的解决方法。     

渣对超低碳钢钢水氧含量影响的分析

讨论了钢包渣、中间包渣对钢水中夹杂物的吸附和钢水的二次氧化作用的影响、OB处理对钢包渣的影响和保护浇铸对钢水的影响。研究表明,RH处理过程中,OB使渣的氧化性提高是造成钢水二次氧化的主要原因。因此,RH精炼时应尽量减少OB处理。     

高炉炉渣粘度性能预测系统

针对南钢矿石成分、炉料结构的不断变化,用计算机语言编制可计算在不同矿石成分和炉料结构下的理论炉渣成分及其它参数的软件。同时,收集了大量南钢正常生产时的炉渣成分数据,建立了高炉炉渣粘度数据库,根据坐标转换的作图原理,用Excel作出CaO SiO2 Al2O3系工业等粘度图,对照计算炉渣成分,提前预测了高炉炉渣状况,并以此来指导生产实践。     

Effect of Nitrogen Alloying on Sulphur Behaviour during ESR of AISI M41 Steel

In this work, the effects of nitrogen alloying, physical properties and chemical composition of slag used in electro‐slag refining (ESR) on phosphorus and sulphur contents of AISI M41 high speed steel have been studied. The experiments were conducted with two high speed steel grades which were melted in an induction furnace (IF). The first grade is the standard AISI M41 high‐speed steel and the second one is nitrogen alloyed M41 (denoted M41N). The produced ingots were ESR remelted under three grades of calcium fluoride based slag. Results showed that the ESR process has no effect on the phosphorus content in steel but it is a good tool in removing sulphur. This study shows that a high desulphurization rate can be achieved by ESR process by optimizing slag properties where the viscosity and oxidation reactions play an important role in sulphur removal. Nitrogen alloying was found to retard sulphur removal.     

卧辊磨在矿渣单独粉磨系统中的应用

论述了利用料床挤压粉磨原理的新型粉磨设备——卧辊磨的结构原理,介绍了卧辊磨在矿渣超细粉磨行业使用的优势及特点。阐述了卧辊磨的成功研制和推广必将成为矿渣超细粉磨领域中的革命性的科技成果。     

明清时期白银冶炼渣浮选工艺研究

对某地明清时期白银冶炼渣进行了浮选试验研究,确定一次粗选、一次精选、二次扫选为最佳工艺流程,闭路试验获得了金品位为19.83g/t的金精矿,金回收率达到83.23%,为这部分已废弃的矿产资源再回收利用提供了技术保障。     

Influences of Technological Parameters on Smelting-separation Process for Metallized Pellets of Vanadium-bearing Titanomagnetite Concentrates

The smelting-separation process for metallized pellets of vanadium-bearing titanomagnetite concentrates was studied.The influences of smelting temperature,smelting time,and the basicity of the metallized pellet on vana-dium and iron recovery were investigated.The characteristics of titanium slag were analyzed using X-ray diffraction, energy dispersive spectroscopy,and mineralographic microscopic analysis.The results demonstrate that appropriate increases in smelting temperature and smelting time can improve the vanadium and iron recovery from metallized pel-lets and are beneficial for the slag-iron separation.Although increasing the basicity of the metallized pellet can consid-erably improve the vanadium and iron recovery,the TiO2 grade of titanium slag was decreased.Under the optimal conditions,90·17% of vanadium and 92·98% of iron in the metallized pellet were recovered,and the TiO2 grade of titanium slag was 55·01%.It was found that anosovite,augite,spinel,glassiness,and metallic iron were the main mineral phases of the titanium slag.     

含钛高炉渣的抑菌性能研究

以含钛高炉渣为原料,利用XRF、XRD、SEM、UV-Vis-DRS等分析方法对含钛高炉渣进行化学成分分析,确定了其作为光催化剂的可行性。通过抑菌环法和烧瓶振荡法研究了含钛高炉渣对白色念珠菌(ATCC10231)、大肠杆菌(ATCC25922)、金黄色葡萄球菌(ATCC6538)的抗菌性能。结果表明:纯含钛高炉渣对大肠杆菌(ATCC25922)无明显抑菌作用,对白色念珠菌(ATCC10231)抑菌作用表现不明显,而对金黄色葡萄球菌(ATCC6538)表现出一定抑菌性,在作用1 h时抑菌率达54.54%。