钢包钢水温降及其影响因素的模拟

通过有限元方法建立了120 t钢包的传热模型,计算分析了钢包在使用过程中的传热行为,研究了钢包内衬及厚度对钢水温降的影响.结果表明:使用导热系数较低的保温材料,在传统钢包内衬中添加绝热层能显著提高钢包的保温效果,减低钢水温降速率;改变工作衬厚度对钢水温降速率的影响较小.     

覆盖剂和保温层对钢包钢水温降影响的数值模拟

通过建立数学模拟研究了添加覆盖剂和保温层对钢包静置过程中钢水温降的影响。结果表明:钢包静置过程中,钢水通过其上表面及钢包的包衬向外界传递热量,钢水温度下降。添加保温覆盖剂可使钢水上表面热损失大幅度下降,从而有效减小钢水温降。添加保温层可有效减小钢水通过钢包包衬向外界环境散失的热量,从而有效减小钢水温降。     

高Al2O3物料对镍电炉渣粘度的影响

论文对Al2O3高达69．46％的含镍物料电炉处理时对炉渣性能的影响进行了研究。研究表明：吉林镍业公司冶炼厂电炉渣1340℃时黏度为0．538P．s；电炉渣在不添加任何其它试剂的情况下，渣中Al2O3含量不宜高于9％；加入添加剂后，炉渣黏度降低，当在配料中加入20％此种含镍物料时，添加剂加入量7％为宜，此时炉渣黏度为0．74P．s（1340℃）。     

转炉装入量切换冶炼的用氧工艺研究

武钢股份公司要求条材总厂CSP分厂的转炉不仅要向CSP连铸连轧生产线（转炉的装入量为150t）提供钢水,还要随时按计划向条材总厂一炼钢分厂（转炉的装入量为120t）提供钢水,要求CSP分厂的转炉解决装入量切换（120t/150t）冶炼的用氧问题,本文论述了转炉装入量切换（120t/150t）冶炼的用氧工艺问题。     

钢水出炉后的温降探讨

对第二炼钢厂复吹转炉的钢水出炉后温降进行了分析研究,温降主要与出钢加入的合金种类,数量,钢水氧化性,出钢时间,出罐罐况,钢水出完至到站的过程时间长短等因素有关。实际应用情况表明,实际出钢温降与分析计算值基本吻合,结论对实际操作具有指导意义。     

济钢25t转炉复吹技术的实践

介绍了顶底复吹技术在济钢25t转炉上的应用。在合理设计底吹流量控制方式的条件下，底吹强化了转炉内钢水的搅。拌，减少了钢水和渣的氧化，与顶吹工艺相比，钢水和锰的收得率分别提高了0．24％和2．5％，钢铁料和石灰消耗分别降低了2．4kg／t和2．0kg／t，年综合经济效益达313万元。     

转炉冶炼终点静态控制预测模型

基于天津天铁冶金集团30t转炉炼钢实际生产数据,首先建立了转炉炼钢终点静态控制的吹氧量及矿石用量统计模型,其预测100个炉次吹氧量和矿石用量平均相对误差分别为0．58％及10．4％。考虑到影响终点钢水温度和碳含量的因素比较复杂,设计了预测钢水终点温度和碳含量的人工神经网格模型,利用Levenberg-Marquardt算法和257个炉次的实际生产数据进行了模型训练,并对另外100个炉次的终点钢水温度及碳含量进行了预测,在终点钢水温度为1646-1698℃和终点碳质量分数为0．033％～0．128％的范围内,得到的终点碳温双命中率为55％。     

转炉炼钢各工序温降因素及其控制措施

分析转炉炼钢过程中钢水温降及其影响因素:出钢温度、钢包运行时间、合金、辅料加入量及吹氩喂线操作等是影响钢水过程温降的主要因素。通过对钢水温降规律的研究,掌握了钢水全流程温度变化规律,并通过对影响钢水过程温降的因素进行研究,提出了降低出钢温度、加强钢包管理等减少钢水过程温降的措施,缩短了炼钢全流程物流时间,降低了钢水过程温降,中包温度合格率大幅度提高,中包温度合格率提高后浇注更加稳定,铸坯质量合格率也有明显的提高。     

活化烧结对金刚石增强型硬质合金复合齿性能的影响

在金刚石增强型硬质合金复合齿基体中球磨添加不同量红磷，比较相应的金刚石增强型硬质合金基体的性能，确定添加(质量分数)0．3％P的复合齿基体性能最好；同时采用化学镀Ni-P合金添加P结合球磨添加0．1％P的方式，其超硬复合齿基体力学性能及复合齿的磨耗比、抗冲击功远远优于单纯球磨添加0．3％P方式超硬复合齿的性能。说明为了实现金刚石增强型硬质合金复合齿的活化烧结方式，磷元素最优的添加方式是化学镀结合球磨的添加方式。     

应用烟气分析直接出钢模式的冶金效果

马钢120 t转炉应用烟气分析动态控制技术冶炼低碳钢,终点碳和温度命中率达到88.6％,实现不倒炉直接出钢新模式。与倒炉测温取样补吹出钢传统模式相比,其冶炼周期缩短4～6 min,钢水终点φ（O）低（200～300）×10－6,终点w（P）≤0.012％,终点w（S）≤0015％,残w（Mn）高003％～005％,喷溅率小于4％,吨钢石灰消耗小于50 kg。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.