合理的转炉废钢比探析

针对八钢铁水供应不足且铁水成分波动较大的问题，文中在现场冶炼数据采集的基础上，依据转炉冶炼的物料平衡、热平衡以及现场试验，研究了铁水成分、铁水重量、铁水温度、出钢温度以及留渣操作等工艺参数对废钢加入量的影响.通过采用留渣操作、适当提高铁水温度、减少辅料消耗以及适当降低转炉出钢温度等措施，转炉废钢比由16.4%提高到21.3%，脱磷率由79.3%提高到93.3%，同时石灰和白云石消耗量分别降低了3.3 kg/t钢和6.7 kg/t钢.      

降低100 t转炉铁钢比的途径

根据国内某炼钢厂100 t转炉的入炉金属料参数和冶炼相关参数,运用物料平衡、热平衡计算方法,对转炉的物料平衡、热平衡进行计算,算出不同入炉铁水量及温度下的合理废钢加入量、出钢量和铁钢比.通过分析影响铁钢比变化的两个主要影响因素:铁水人炉温度和铁水入炉量,来研究铁钢比与废钢加入量、出钢量之间的关系.提出100 t转炉降低铁钢比的具体措施,供相关炼钢厂参考.     

电弧炉冶炼工艺对钢液氮含量的影响

根据现场试验结果，分析了南钢100t电弧炉冶炼工艺对钢液氮含量的影响，结果表明：对同一批废钢，随着铁水加入量的增加，出钢钢液氮含量下降；出钢过程加铝脱氧则增加钢液吸氮量。     

70t电炉热装铁水的实践与进步

电炉热装铁水是冶炼纯净钢的最佳途径，兑加铁水的方式主要有：加入废钢后用行车吊起铁水罐直接从炉顶兑入；用专用铁水流槽从炉门兑入；从炉壁的特定位置用专用装置兑入。八钢电炉厂70t电炉炼钢一直采用顶兑铁水的方式，兑入时间一般是第一批料入炉后。通过采取改进操作、优化脱碳、增加供氧强度及提高功率因数等措施，热兑铁水比例增加了10％～25％，电耗下降50～70kW．h／t，冶炼时间缩短13rain。     

低镍铁水冶炼1Cr14Mn10NiCuN不锈钢生产工艺优化

通过对1Cr14Mn10NiCuN不锈钢冶炼的几种原料条件和工艺路径对比分析,发现采用低镍高炉铁水为主要原料的工艺流程因铁水成分、温度和洁净度更优而更具竞争力。某厂采用高硅含铬低镍铁水冶炼1Cr14Mn10NiCuN不锈钢,铁水带入铬可节约50铬铁用量约66.7 kg/t(钢),降低成本约400.5元/t(钢),但预处理环节铬的收得率仅为88%,铬损失量折算成50铬铁达到9.1 kg/t(钢),折合人民币约54.6元/t(钢)。工艺优化方案考虑在铁水预处理炉吹氧结束时加入合金熔化炉熔化的铬铁水,利用铬铁水中的硅还原渣中的铬。工艺方案优化后在预处理炉环节将低镍铁水中的铬收得率提高至95%,使生产全流程50铬铁加入量减少约5.3 kg/t(钢),降低成本约31.9元/t(钢)。     

降低吨钢铁水量的转炉冶炼工艺

采用变量法精确确定了吨钢入炉铁水量调整后转炉系统的热量亏空,通过优化调整转炉造渣物料结构,减少强冷却效果物料的使用量,配加反应速度快、升温效率高的碳-硅质发热剂,稳定解决了吨钢铁水量降低所带来的转炉系统热量不足的问题,提高了入炉废钢比。在工业生产顺行的基础上,80 t转炉入炉铁水量由860 kg/t钢降低到800 kg/t钢。     

淮钢铁水热装技术取得成果

淮钢于1995年在全国首创铁水热装工艺,将一座高炉的部分铁水直接装入5t炼钢电炉,获得成功后,又将另一座高炉铁水加入现代化的70 t超高功率电炉。同时,淮钢又与美国普莱克斯公司合作兴建了3067m~3真空变压吸附式制氧生     

AOD用转炉脱磷铁水冶炼430不锈钢脱碳保铬工艺优化

采用热力学、物料和热量平衡的计算方法,研究了180 t AOD用转炉脱磷铁水冶炼430不锈钢脱碳前期脱碳保铬的工艺。研究结果表明:合理控制最佳脱碳保铬温度是提高AOD冶炼430不锈钢各项经济技术指标的关键技术。采用优化转炉生产节奏和出钢的保温,保证AOD入炉铁水温度由1 520℃提高至1 580℃;优化AOD脱碳前期合金和辅料加入量,进一步提高了脱碳前期的钢液温度,减少铬的氧化量。通过实施工艺优化措施,AOD用转炉脱磷铁水冶炼430不锈钢经济技术指标得到明显改善,其中铬收得率由92.30%提高到94.64%,冶炼时间缩短9.2 min,还原硅耗降低4.9 kg/t。     

低铁耗高炉龄条件下的转炉冶炼操作优化

正低铁耗、高炉龄,高作业率是2018年柳钢转炉炼钢生产的现状。转炉厂炼钢一区拥有3座150 t顶底复吹转炉,日均产钢93炉,平均出钢量154 t,日产合格钢坯14 300 t,月平均作业率92%。铁水装入量138～144 t,废钢装入量26～30 t,铁水耗     

热变形量对半钢的组织与力学性能的影响

试验研究得出，热变形量对半钢的组织与力学性能有显著的影响，40％－50％热变形量的半钢的综合机械性能最佳。     

Acceleration of Electricity Reform Brings Benefit to Big Electricity Users,Aluminum Manufacturers Can Save Costs Up to Several Hundred Million

<正>Recently the National Commission of Development and Reform again assembled experts to solicit opinions,and discussed new electricity reform program.According to information disclosed by experts attending the meeting,in the future electricity reform will undergo top-down design,possibly a     

Qinghai's Aluminum Processing Capacity to Rise at the End of the Year

正Since the release of Implementation Opinions on Carrying out‘Guiding Opinions of the State Council on Resolving Serious Production Overcapacity Conflicts’,according to the actual situation of industry,Qinghai has focused on electrolytic aluminum,cement,ironsteel(including iron alloy and silicon carbide),     

Recent Trends in China's Copper Scrap Market-Part Ⅱ

<正>2.Tianjin Scrap Metal Market In Tianjin,we mainly visited Jinghai Ziy Town scrap market and Binhai New Area’some copper scrap enterprises and enterprise using copper scrap.In Ziya we felt the coppe scrap market was particularly deserted,mos copper scrap enterprises in the town wer closed,industry insiders said in 2012 the plac here was bustling with activity.According to     

Shanghai Clearing House to Roll out Renminbi-denominated Copper Clearing Operations in Free Trade Zone

正Clearing House Financial Markets Co.,Ltd.(Shanghai Clearing House)General Manager Xie Zhong told the media recently at the briefing of the international symposium of"Reform Deepening and Mechanism Innovation of the Post-crisis Kerb Market",Shanghai Clearing House will explore the feasibility of carrying out bond business in     

Development and Application of New Materials for Copper Processing in China

正After over 60 years of developmnt,a system for RD and production of copper processing materials has already taken shape in China.After the reform and opening-up,the application of copper processing materials has gradually expanded from the military industry to civil field.The annual output of copper     

China’s Mineral Exploration Market Downturn Causes Decline of Investment in Bauxite

<正>According to a survey report conducted recently by China Geological Survey Development Research Center,in the first half of 2014,China’s mineral exploration market continued to decline,with the investment in exploration of non-fuel minerals dropping by13.7%and drilling workload dropping by21.7%.According to statistical analysis of the Center,     

Fabricated Copper Production by Province or City in 2014

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Zinc Production by Province in 2014

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China's Aluminum Alloy Cable Market has Taken Shape

正Aluminum alloy cable is a mature product and technology that has been used for nearly fifty years in the U.S.Through six years’promotion,it has been widely recognized and accepted in the China market since 2013,which laid the foundation for the development of the aluminum alloy cable market.Aluminum alloy cable is widely applied in the fields of civil construction and industrial and mining enterprises,especially in real estate,steel and metallurgy.     

Qinghai to Build a 100 Billion Yuan Lithium Industry Base

正At 2014 China Qinghai Trade Fair for Green Development Investment,Qinghai EV Rally2014 was introduced for the first time.With electrical vehicles’eco-friendly features,Qinghai manifested its determination on green development.Introducing Qinghai EV Rally was just a signal.By leveraging its rich salt lake resources