高磷铁矿球团气化脱磷影响因素研究

通过XRD衍射仪分析了高磷铁矿中磷的赋存状态,并结合FactSage 7.2热力学分析结果,采用配料造球、球团焙烧等手段,探究了不同配碳量、温度和焦粉粒度对高磷铁矿球团气化脱磷的影响规律。结果表明: 高磷铁矿中磷的存在形式为Ca₅(PO₄)₃F,加入0.8% SiO₂和1.6% CaCl₂作为混合脱磷剂,在焙烧温度1250 ℃、配碳量8%、焦粉粒度0.074~0.15 mm时,气化脱磷率达24.1%。     

SiC 还原磷灰石气化脱磷的热力学机理研究

以 SiC 为还原剂,Na2CO3、Al2O3 和 SiO2 为辅助脱磷剂研究磷酸钙的还原气化脱磷机理。 利用 FactSage 7. 1 热力学软件计算以及试验分析了不同温度以及辅助脱磷剂添加量对气化脱磷的影响。 结果表明:脱磷反应在无 液相参与时还原程度较低,在 1 300 ℃下气化脱磷率为 17. 83%。 辅助脱磷剂 Na2CO3 添加量分别为 6%、8%和 10%时 生成液相,气化脱磷率显著提高。 X 射线衍射分析结果显示,产物中硅酸钙盐较多,与模拟中脱磷反应的固相产物一 致。 最佳的辅助脱磷剂 Na2CO3 添加量为 8%、Al2O3 添加量为 7. 7%、SiO2 添加量为 14. 06%,在 1 300 ℃ 下对应的气 化脱磷率为 86. 50%。 当辅助脱磷剂 Na2CO3 添加量达到 10%时,气化脱磷率降低到 35. 79%,检测到固相产物中有 Na 2Ca3Al2(PO4) 2(SiO4) 2 存在,这是霞石与磷酸钙在 1 300 ℃ 下的反应产物,导致磷元素被固定在其中无法气化脱 除,从而降低了气化脱磷率。     

某悬浮焙烧—磁选铁精矿的浮选脱磷试验

某高磷鲕状赤铁矿石悬浮焙烧—磁选精矿属于高磷铁精矿,铁品位为57.95%,磷含量为0.63%,主要铁矿物为磁铁矿,主要含磷矿物为磷灰石,主要杂质成分Si O2、Al2O3、Ca O含量分别为6.46%、3.61%、3.07%。为使铁精矿磷含量达到产品质量标准,进行了浮选脱磷试验。结果表明:以DP-1为捕收剂,采用1粗1精1扫闭路流程处理试样,可获得铁品位为59.36%、含磷0.30%、铁回收率68.88%的脱磷铁精矿,磷脱除率达67.98%,达到了铁精矿对磷含量的要求。     

某高磷铁矿生物浸出除磷试验研究

采用4.5K培养基培养氧化亚铁硫杆菌,对某高磷铁矿进行了细菌浸出脱磷试验,研究了浸出过程中各工艺因素对氧化亚铁硫杆菌浸矿脱磷的影响.试验表明,浸出该高磷铁矿适宜的条件为:氧化亚铁硫杆菌接种量为15 mL,4.5K培养基85 mL,液固比100:5,试样粒度- 0.074+0.054 mm,初始pH值为1.8,在30℃下恒温振荡浸出6d,试样含磷可降至0.3％,脱磷率达到65.5％.浸出动力学研究表明:氧化亚铁硫杆菌浸出脱磷过程中受化学反应控制,升高温度、减小矿粒均可提高反应速率.在实际浸出时,由于细菌对温度的要求较高,在保证浸出温度适宜的情况下,可适当减小矿石粒度以加快反应速率,提高脱磷率.     

高磷鲕状赤铁矿脱磷处理研究进展

介绍了高磷鲕状赤铁矿的资源状况以及脱磷难点。结合最近几年选矿工作者针对鲕状赤铁矿脱磷所做出的研究工作,总结了利用反浮选脱磷工艺、深度还原脱磷工艺、浸出脱磷工艺以及一些其他重要的脱磷工艺所取得研究成果,指出各种脱磷工艺所存在的问题,并分析高磷鲕状赤铁矿脱磷技术的发展趋势。     

基于CaO-SiO_2-FeO-Na_2O-Al_2O_3渣系的中高磷铁水脱磷试验研究

结合现有铁矿含磷高的实际情况,采用Ca O-Si O2-Fe O-Na2O-Al2O3渣系对中高磷铁水进行脱磷的试验研究。研究结果表明,脱磷渣系的碱度值ω(Ca O)/ω(Si O2)为4时,在相同试验条件下,分别用Al2O3、Na2O和Al2O3与Na2O的混合物代替常规的Ca F2时均可达到更高的脱磷效果;造渣剂分两次加入的脱磷效果比一次性加入的更好。当渣系中使用4%(Al2O3)+2%(Na2O)的复合熔剂,分两次加入时,铁水的终点脱磷率可达到96%。     

基于 CaO-SiO2-FeO-Na2O-Al2O3渣系的中高磷铁水脱磷实验研究

结合现有铁矿含磷高的实际情况,采用Ca O-Si O2-Fe O-Na2O-Al2O3渣系对中高磷铁水进行脱磷的试验研究。研究结果表明,脱磷渣系的碱度值ω(Ca O)/ω(Si O2)为4时,在相同试验条件下,分别用Al2O3、Na2O和Al2O3与Na2O的混合物代替常规的Ca F2时均可达到更高的脱磷效果;造渣剂分两次加入的脱磷效果比一次性加入的更好。当渣系中使用4%(Al2O3)+2%(Na2O)的复合熔剂,分两次加入时,铁水的终点脱磷率可达到96%。     

高磷铁矿石直接还原—磁选研究进展

针对高磷铁矿石性质复杂,铁回收困难的问题,研究人员提出的直接还原—磁选工艺 处理高磷铁矿石具有良好的提铁效果。归纳了各类高磷铁矿石性质,从高磷铁矿石直接还原—脱 磷工艺和直接还原—富磷工艺两种路线总结了近年来的成果,并阐明了两种工艺的机理。根据高 磷铁矿石是否为鲕状构造,将高磷铁矿石分为高磷鲕状铁矿石和其它高磷铁矿石。采用直接还原 —脱磷工艺处理各类高磷铁矿石能获得炼钢要求的直接还原铁,寻找低成本脱磷剂、研究反应进 程的控制以及查明脱磷剂用量大的原因是未来的重要方向。采用直接还原—富磷工艺可获得磷含 量大于1.5%,磷回收率在60%~70%的高磷直接还原铁,调整焙烧条件进一步提高磷回收率以及查明 磷在铁相中存在形式是今后的研究重点。采用直接还原—脱磷工艺处理高磷铁矿石已成功进行了 工业试验,为实现该类矿石的开发利用,要从研发新的还原装备、研究还原气氛的精准控制技术 、气体成分在线监测仪器以及降低生产能耗等方面进行深入研究。     

印度高磷锰矿石焙烧脱磷

由于普通物理选矿方法不适用于印度安得拉邦和奥里萨邦南部的高磷锰矿石脱磷,所以必须采用化学方法。为此,采用碳酸钠焙烧后热水浸出工艺对安得拉帮部分选过的锰矿石进行了降解磷试验。但奥里萨邦南部Nishikhal矿的锰矿石磷含量较高,仅添加Na2CO3进行焙烧很难脱磷,发现必须采用Na2CO3和NaCl的混合物才能把磷含量降到0.15%以下。在700℃以上时,自由能计算表明,与NaCl相比,Na2CO3(或Na2O作为活性成分)是活性更好的药剂。通过研究了各种工艺参数如焙烧的温度和时间、碳酸钠用量以及浸出的温度和时间性,得到脱磷的最佳条件。试验结果如下…     

一种黑曲霉对高磷锰矿脱磷的研究

简要分析了高磷锰矿石脱磷的必要性;总结了当前脱磷工艺的研究现状及方法;讨论了微生物脱磷的地球化学和生化基础,探讨了微生物脱磷的机理。从锰矿石中磷的存在形态着手,用一株诱变得到的黑曲霉进行了高磷锰矿脱磷试验。通过该方法,对磷的质量分数为0.19%的锰矿石,磷的去除率为78.5%,脱磷后锰矿中磷的质量分数下降为0.04%。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸，掘进巷道受深部高应力的影响越来越大，巷道围岩整体稳定性差，矿山压力显现越剧烈现象，一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术，依据对巷道掘进之后变形监测数据的采集，对巷道变形机理进行分析研究，并对注浆时段进行了合理选择，在对巷道的注浆工艺进行了充分论证的基础上，对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要，巷道在恰当的时间内进行注浆加固施工，能有效控制巷道的变形，巷道注浆后变形量明显减小，岩体的稳定性明显增强，减少了巷道日常维修工作，降低了矿井的生产成本，保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared