煅烧冶金石灰活性度分析

依据石灰石煅烧机理及其分解化学反应式，推导、总结出石灰活性度理论计算公式和经验计算公式。通过运用两个公式，计算分析了试验报告、矿山石灰石原料、回转窑生产等技术资料，合理选用了石灰石原料，制定了科学合理的回转窑工艺技术参数，煅烧出高活性度冶金石灰。     

微波煅烧石灰的活性度及显微结构

 试验选取3个不同产地的石灰石为原料,研究了微波加热以及不同结构的石灰石对石灰活性度的影响,并对活性石灰的微观形貌进行了观察。试验结果表明,利用微波加热可在较低的加热温度和较短的保温时间条件下得到高活性的石灰,所得石灰的活性度均达到了400 mL以上,最高可达435 mL,比传统生产石灰的方法活性度要高25 mL;当石灰石的结构致密且晶粒大小分布不均匀时,所得石灰的活性度偏低;通过扫描电子显微镜对石灰的观察可以更清楚了解到活性石灰的微观形貌为多孔结构,由细小的氧化钙晶粒组成。     

温升速率法测定高活性石灰的活性度

介绍了一种测定高活性石灰活性度的方法——温升速率法。测定时,将225 mL温度为24℃水倒入1 000 mL保温容器内,在转速为300 r/min的搅拌器搅拌下,将75 g一定粒度石灰试样倒入容器中,根据溶液首次出现最高温度时间和达到的最高温度,计算温升速率,即石灰活性度。对试样的粒度及实验结果的精密度进行了研究,并用酸碱滴定法和温升速率法测定了5种不同活性石灰的活性度。结果表明:温升速率法测定石灰活性度时试样粒度以不大于1 mm为宜,两种方法测定的石灰活性度曲线变化趋势一致。用本法测定一石灰样品的活性度     

活性石灰在转炉炼钢的应用

冶金石灰作为钢铁冶炼的重要辅助材料,随着钢铁质量与产量的不断提高,钢铁生产对石灰的质量要求也越来越高,即现在的钢铁冶炼要求使用活性度极高的活性石灰。以活性石灰为研究对象,简要介绍了石灰的性质、生产设备以及石灰在转炉炼钢中的应用。     

活性石灰在转炉炼钢中的应用

在鞍山钢铁公司第三炼钢厂180 t氧气转炉上进行了应用普通石灰和活性石灰的对比试验,结果表明,由于活性石灰晶粒细小、活性度高,具有成渣速度快,去硫、磷效果好等冶金特性,从而显著地改善了各项经济技术指标。     

气烧外燃式石灰炉的生产实践

气烧外燃式石灰炉属气烧竖炉。煤气、空气在外燃式石灰炉的环形燃烧室内混合均匀,燃烧充分,火焰温度均匀,便于控制。采用合理的操作工艺,可煅烧出活性度高的冶金石灰,满足炼钢生产的要求。炉子利用系数可达１．２～１．６。     

高温快速煅烧石灰的活性度研究

模拟转炉余热在线高温快速煅烧石灰的条件,在实验室研究了煅烧温度、煅烧时间以及不同试样形式对高温煅烧的石灰活性度的影响规律。研究表明,12～15mm石灰石颗粒在1300-1400℃煅烧7min,石灰活性度大于335mL,且石灰活性度随煅烧温度升高而升高;当煅烧超过12min后,石灰开始过烧,活性度明显下降。增大石灰石试样...     

高温条件下石灰活性度的变化行为研究

钢渣中f-CaO引起的体积稳定性是目前钢渣综合利用的主要障碍之一。f-CaO来源于未完全溶解的活性石灰和硅酸三钙的分解。针对石灰未完全溶解产生的f-CaO,需要强化石灰在转炉吹炼过程中的溶解行为。石灰的活性决定着石灰溶解的效率,而石灰的活性度与其微观组织结构紧密相关。通过实验室内制取石灰样品,采用SEM、XRD和压汞仪对样品进行微观结构检测分析,依据YB/T 105—2005标准测定样品的活性度,研究了高温条件下活性石灰的活性度和微观结构的演变规律。试验结果表明,随着温度的升高,活性石灰的活性度和孔隙率均降低,孔隙的平均直径增大;CaO晶体在晶界迁移的作用下逐渐长大。微观结构的变化与石灰活性度的变化趋势紧密相关,因活性石灰内部CaO晶体变形长大和孔隙率降低,致使石灰的活性度降低。这对石灰的溶解造成障碍,不利于炉渣中f-CaO的控制。     

煤基活性石灰含硫量浅析

本对煅烧活性石灰的原料、燃料中硫含量进行了分析，找到了影响活性石灰含硫量的主要原因，并提出相应的措施以提高活性石灰的质量。     

影响炼钢用石灰活性的因素分析

石灰是炼钢生产中的主要碱性造渣材料,其质量好坏对冶炼工艺、钢产品质量以及炉衬寿命等都有着重要影响。本试验采用滴定的方法对不同条件下生产的石灰活性度进行了测定,对影响炼钢用石灰活性的因素进行了分析,经过对比分析得出,影响炼钢用石灰的活性度有诸多因素,而煅烧设备、煅烧温度是影响烧成石灰活性的主要因素。在石灰石焙烧过程中添加NaCl,可以起到提高石灰活性度的作用。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.