复合脱磷剂对微波焙烧高磷铁矿过程的影响

为实现高磷铁矿粉在烧结过程中气化脱磷,促进高磷铁矿的开发利用,试验选用鲕状高磷赤铁矿为原料,采用微波加热方式研究了复合脱磷剂成分及用量对气化脱磷率的影响。结果表明,煤种选用烟煤、配碳量为5%、SiO_2加入量为0.75%、CaCl_2加入量为1.5%、碱度为1.4时,能使高磷铁矿粉在微波场中气化脱磷率达到20.36%。通过X射线衍射仪(XRD)对焙烧产物进行检测得知,过量加入CaCl_2会产生Ca_5(PO_4)_3Cl,不利于气化脱磷的进行。     

高磷钢渣气化脱磷影响因素的实验

 在脱磷剂种类和配比一定的条件下,借助微型烧结实验手段,研究了碱度、温度、配碳量和磷含量等因素对高磷钢渣气化脱磷率的影响规律。研究发现,碱度升高,钢渣气化脱磷率降低,温度升高,钢渣气化脱磷率升高;随着配碳量增加,钢渣气化脱磷率先升高后降低,磷含量增加,钢渣气化脱磷率升高,当磷含量达到一定水平后,磷含量对气化脱磷率的影响减弱,并最终确定了各因素的最佳状态。     

微波焙烧对高磷铁矿气化脱磷的影响

为实现高磷铁矿粉在焙烧过程中气化脱磷,促进高磷铁矿的开发利用。试验基于微波加热的方式和加入复合脱磷剂条件下,研究了微波焙烧工艺参数(温度、煤粉粒度、升温速率、保温时间)对气化脱磷率的影响。结果表明,随着温度的提高、升温速率加快及煤粉粒度的加粗,气化脱磷率明显提高,而保温时间对脱磷率的影响呈现先增加后降低的趋势,通过优化焙烧工艺参数后,高磷铁矿粉的气化脱磷率达到最大值为25.71%。     

脱磷剂对高磷铁矿球团气化脱磷的影响

高磷铁矿由于磷含量过高,限制其大规模开发利用。通过XRD衍射仪分析高磷铁矿中磷的赋存状态,并基于FactSage7.2热力学计算结果的基础,采用配料造球、球团焙烧等手段,探究不同脱磷剂SiO_2和CaCl_2对高磷铁矿球团气化脱磷的影响。结果表明:高磷铁矿中磷的存在形式为Ca_5(PO_4)_3,加入脱磷剂后气化脱磷开始反应温度降低至815℃,在温度1 250℃,配碳5%的条件下,加入SiO_2和CaCl_2配比分别为0.8%、1.6%作为混合脱磷剂,气化脱磷效果最佳,脱磷率达22.1%。为高磷铁矿在球团焙烧过程中气化脱磷提供了新思路。     

高磷鲕状赤铁矿直接还原法脱磷技术的试验研究

为了经济、合理地利用高磷赤铁矿资源,在掌握试验用高磷鲕状赤铁矿理化特性和微观特性的基础上,采用直接还原法进行了固态直接还原+高强度磁选和直接生产珠铁2种工艺的试验研究。试验结果表明,高温度、低碱度以及高配碳量有利于铁矿石中磷灰石还原进入铁水中,不利于磷的脱除;通过工艺参数的优化,采用固态还原焙烧-磁选工艺,高磷赤铁矿脱磷率能达到60%以上,而采用珠铁工艺,其脱磷率能够达到80%以上。为合理高效地处理高磷鲕状赤铁矿奠定理论基础和技术依据。     

高磷赤铁矿气化脱磷反应活化能研究

研究了髙磷赤铁矿气化脱磷过程中活化能的变化。采用综合热分析仪,在样品重量为80 mg、温度范围100~1 350℃、升温速率分别为10、15、20℃/min的条件下,对髙磷赤铁矿和Fe2O3在不同阶段的反应活化能进行对比试验。结果表明:气化脱磷反应在第二失重阶段发生;采用Ozawa法计算得出高磷铁矿反应的第一、二失重阶段和Fe2O3反应的第二失重阶段平均活化能分别为104.71 k J/mol、250.55 k J/mol和168.80 k J/mol,气化脱磷反应为吸热反应,脱磷反应过程中克服能垒需要更高能量。     

焦炭还原转炉熔渣气化脱磷研究

为解决炉渣中磷含量过高而不能直接转炉内循环利用的问题,通过实验室进行了相关热态试验,系统研究了不同温度、碱度、FeO含量、氮气流量对气化脱磷率的影响规律。试验结果表明:气化脱磷率随着温度和氮气流量的增加而逐渐升高,当温度和氮气流量分别控制在1 923 K和0.45 m~3/h时,气化脱磷率分别可达76.26%和64.57%;气化脱磷率随着碱度的降低而逐渐增加,当碱度控制为1.8时气化脱磷率可以达70.35%;FeO含量在16%～32%范围变化时,气化脱磷率随着FeO含量的增加先升高后降低,FeO含量为24%时气化脱磷率最高可以达到66.75%。为实现气化脱磷率在60%以上,应控制分别控制温度、碱度、FeO含量以及氮气流量分别为1 873 K、1.8、24%和0.45 m~3/h。     

焦炭还原脱磷转炉熔渣的气化脱磷试验

 为了解决脱磷转炉熔渣中磷含量过高而不能直接实现转炉内循环利用的问题,在实验室进行了焦炭还原脱磷转炉熔渣热态试验,系统研究了不同碳当量、温度、碱度、FeO质量分数、氮气流量对气化脱磷率的影响规律。研究结果表明,试验采用2倍碳当量气化脱磷效果较好,气化脱磷率随着温度的升高而逐渐增加,1 733 K时气化脱磷率为68.6%;气化脱磷率随着碱度的降低而逐渐增加,当碱度控制为1.4时气化脱磷率可以达到45.6%;FeO质量分数在10%~30%范围变化时,气化脱磷率随着FeO质量分数的增加先升高后降低,FeO质量分数为25%时气化脱磷率最高可以达到43.5%。气化脱磷率随着氮气流量的增加先升高后降低,氮气流量为80 L/h时,气化脱磷率为45.37%。由SEM分析结果可知,脱磷炉渣中的磷主要富集在硅钙富集区域,气化脱磷反应后微区内磷分布无特殊规律。     

高磷鲕状赤铁矿脱磷技术研究

为合理利用我国储量丰富的高磷鲕状赤铁矿,针对其矿物学特点,提出了利用直接还原法处理高磷鲕状赤铁矿提铁脱磷的技术思想.实验表明,通过控制渣相碱度、还原温度和内配碳比等,可提高铁的收得率和脱磷率.     

脱磷剂对铁精矿预还原烧结过程中气化脱磷的影响

白云鄂博铁精矿磷含量较高为0. 08%,磷主要以氟磷灰石的形式存在。为了探索白云鄂博铁精矿预还原烧结过程中磷的气化脱除机理,利用Factsage6. 2热力学软件模拟研究了不同脱磷剂对铁精矿预还原烧结过程中气化脱磷的影响,并以热力学计算为基础,采用真空管式电阻炉进行了还原烧结脱磷试验,对烧结产物的磷含量进行了检测。结果表明,碳直接还原烧结脱磷所需温度较高,气化脱磷率较低;配加Si O_2和Na_2CO_3作为辅助脱磷剂,能有效降低碳的还原脱磷温度,使磷的气化脱除率显著升高,在配碳20%、SiO_23%、Na_2CO_31%的条件下,磷的气化脱除率可以达到29%。     

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

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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.