唐钢烧结配加扬迪矿的实践

在对扬迪矿进行基础特性研究和配矿试验的基础上,唐钢炼铁厂北区于2006年10月开始配用扬迪矿。生产结果表明:随扬迪矿配入量增加,烧结矿转鼓强度、利用系数、成品率、还原性指标都有所改善,而低温还原粉化率变差,燃耗升高,混合料适宜水分有所增高。     

青钢烧结用铁矿粉基础性能研究

以青钢现用的6种铁矿粉为研究对象,采用微型烧结法试验分析测试了矿粉的同化性能、液相生成特性、烧损和结晶水分解特性、微观结构特性等基础性能。结果表明,6种铁矿粉同化性能和液相流动性都较好;杨迪粉的烧损值和结晶水值均较高,超特粉的结晶水含量最高;铁矿粉的微观形貌差异较大,纽曼粉和巴粗粉表面较光滑,而巴卡粉和PB粉的表面较粗糙。铁矿粉的使用原则应为满足低温烧结、有足够的液相流动性、结晶水含量低,微观结构表面有一定的粗糙度。     

不同燃料配加工艺及其对烧结过程的影响

采用不同的燃料配加工艺,其混料造球、燃料分布及烧结过程参数等均会不同,最终获得的技术经济指标也有所差异.本文就济钢采用不同燃料配加工艺后,生产过程中出现的变化和现象进行了初步研究与探索,并对烧结热量梯度优化技术的合理性从理论上进行了分析.     

熔剂添加对烧结过程中有害气体排放规律影响的研究

在定碱度前提下改变生石灰和石灰石配比进行烧结杯实验,通过测试烧结过程有害气体成分的变化,得到石灰石和生石灰熔剂添加对烧结过程废气排放规律的影响.实验结果证明,生石灰和石灰石有效成分配加比例为3:7时,烧结矿冶金性能较好,SO2和NOx排放量减少,SO2产生更加集中,熔剂中配加一定比例的石灰石有利于在烧结过程的高温条件下发生固硫反应,从而降低烧结烟气中的SO2排放量.     

基于烧结基础特性的铁矿粉优化配矿研究

采用微型烧结法对包钢用的5种铁矿粉的烧结基础特性进行了研究。为指导烧结配矿提供理论依据。     

Influence of Sintering Temperature on the Structure and Properties of Powder Iron Aluminide Fe3Al

Powder Metallurgy and Metal Ceramics - The paper examines the impact of heating temperature and isothermal holding time during sintering in a vacuum on the phase composition, structure, and...     

Origin and Subsequent Behaviour of Inclusions in Water-Atomized Low-Alloy Steel Powder

Abstract

The origin of inclusions in a water-atomized 3·5%Ni steel powder and their subsequent behaviour during sintering have been investigated. Four samples of the powder were produced under different melting and atomizing conditions. For example, both acid SiO₂ and basic MgO linings were used in the melting furnace. The volume fraction of inclusions was measured for the powders in the as-delivered and sintered conditions. Similarly, the chemical composition of individual inclusions was determined using electron microprobe techniques. The analysis showed the inclusions to be mainly complex oxides. Those oxides formed from elements less stable than SiO₂ were reduced by the sintering process. These oxides originated mainly from the alloying elements present in the steel powder. The residual stable complex oxides containing silicon, aluminium, magnesium, calcium, sodium, and sulphur were shown to originate from the refractories and atomizing medium used. A much lower volume fraction of inclusions was measured for the powder produced with fewer silicon-containing refractories in the atomizing system. Other measures to help minimize the inclusion levels in water- atomized low-alloy powders during their manufacture are highlighted. PM/0175     

配加梅山铁精矿对烧结生产的影响

对各种梅精配比的烧结生产进行数据统计分析，找出配加梅精对烧结各项指标的影响，并提出加强粉矿的基础特性研究、提高烧结矿相中SFCA的比例以及增加生石灰用量等措施。     

温度和气氛对蜂窝篦齿粉末烧结状态的影响研究

蜂窝篦齿是航空发动机中的重要封严结构.蜂窝填充粉末的烧结状态对其封严性能及使用寿命有十分重要的影响.在不同的温度和保护气氛中对蜂窝进行烧结,通过光学显微镜、扫描电镜、X射线衍射和能谱技术研究了烧结温度和烧结气氛对蜂窝烧结状态的影响.结果表明:在烧结过程中镍铝合金粉末发生了扩散,随着烧结温度的升高,粉末颗粒间的粘结程度逐渐增大,不同的烧结气氛对组织结构并无明显影响,并且能够有效地防止氧化物的产生.     

应用数理统计技术对烧结所用原料铁精粉批次品质的评价

天津众冶公司采用数理统计技术，对不同批次铁精粉的品质进行评价，确定质量稳定的铁精粉供应商，为满足烧结生产提供精料。     

烧结温度对利用废钢粉制备铁基粉末冶金制品的影响

以废钢粉取代普通钢粉制备铁基粉末冶金制品可以大幅度降低生产成本,节约资源。通过测定其密度、硬度与弯曲强度,重点研究了烧结温度对铁基粉末冶金制品性能的影响。结果表明,当温度不超过1180℃时,试样的密度、硬度随着烧结温度的上升而逐渐增加。试验最佳烧结温度为1170℃,此时试样的弯曲强度达到最大值724.15M Pa,随着温度的继续升高,弯曲强度下降。     

Heavy-Metal Extraction from Wastewater by Means of Iron Nanopowder

Two methods of producing iron nanopowder that is resistant to atmospheric oxidation are considered. The properties of the nanopowder are investigated by thermogravimetric analysis, X-ray diffraction analysis, and scanning electron microscopy. Its specific surface is measured by low-temperature nitrogen absorption. The effectiveness of the iron nanopowder in the removal of heavy metals (lead, copper, and zinc) from industrial wastewater is assessed for model solutions and for wastewater from the gas-processing system in the blast-furnace shop at PAO Severstal. The concentrations of dissolved ions are determined by ion-selective potentiometry and atomic-emission spectrometry. For purposes of comparison, experiments are conducted with natural sorbents (shungite, glauconite) and artificially activated K coal.     

西昌钢钒烧结配加40褐铁粉矿试验研究

对西昌钢钒烧结配加TFe为40％的褐铁粉矿进行了实验对比及工业试验。表明在西昌烧结配加7％的40褐铁粉矿情况下,在烧结操作参数变化不大的变化条件下可确保烧结的产质量不发生大的变化,同时烧结配加40褐铁矿粉替代中品位赤铁矿粉具有一定的成本优势。     

配加白云石粉对烧结过程及烧结矿质量的影响

本文从生产实践和理论说明了中高质量的白云石粉对烧结过程及烧结矿质量物影响，配加白云石粉是改善烧结矿冶金性能，提高炼铁生产技术经济指标的有效途径之一。     

宣钢配加伊朗矿的烧结试验研究

伊朗矿硅高,粒度较粗,价格便宜。根据伊朗矿的特点,欲在宣钢现有原料条件下,配加部分该矿。为考察配加效果,在实验室进行了前期的烧结杯试验。试验结果表明,适当增加伊朗矿配比,可以改善烧结矿的质量。伊朗矿配比为10％,烧结矿转鼓指数提高2个百分点,RDI＋3.15提高6个百分点,但软化开始温度降低了21℃。     

Powder Metallurgy Wear-Resistant Materials Based on Iron. Part 1. Materials Prepared by Sintering and Infiltration

Available information on the composition and methods of production of iron-based powder metallurgy wear-resistant materials is reviewed. It is shown that most developments in this field are based on the principle of obtaining wear-resistant material by the creation of a pseudoalloy with a clearly defined heterogeneous structure, in which the microhardnesses of the base material and a hard phase are substantially different. In addition to traditional methods, including pressing and sintering porous ingots and (in some cases) infiltration with a lower melting alloy, methods based on hot working sintered porous ingots under pressure have recently found wider application.