超级铁精矿提纯与锶铁氧体预烧料试验研究

对武钢金山店的磁铁精矿进行提纯，得到了超纯磁铁精矿（TFe〉71．5％，SiO2〈0．5％）。以该超纯磁铁精矿与分析纯碳酸锶及添加剂为原料，通过对配比、预烧温度、保温时间等条件进行优化得到了性能较好的锶铁氧体预烧料。     

利用铁鳞制备永磁铁氧体预烧中结核的成因与改善措施

本文对链蓖机—回转窑生产铁氧体预烧料的影响因素及工艺控制要点进行初步探讨,分析以铁鳞为原料的铁氧体预烧料球结核现象的成因,并提出改善措施,提高铁氧体预烧料的产品质量。     

高性能铁氧体预烧料的高能效制备方法探究

现阶段传统现有高性能的铁氧体型式预烧料高能效化制备操作方法已经无法满足实际的生产运行需求.该文通过分析国内与制备高性能的铁氧体型式预烧料方式方法等相关的文献,围绕着高性能的铁氧体型式预烧料高能效化制备操作方法开展深入研究及探讨,望能够为相关课题的深入研究及有效应用提供指导.     

一种制备永磁铁氧体预烧料的方法

正专利号:ZL201510352109.6专利权人:南京梅山冶金发展有限公司宝钢集团上海梅山有限公司上海梅山钢铁股份有限公司设计人:匡雪冬袁小镇吴永路邱士星本发明是一种制备永磁铁氧体预烧料的方法,特别是涉及一种混杂型铁氧体预烧料的制备方法。该方法特征在于原料上采用了不止一种的     

Pr6O11对锶永磁铁氧体改性的研究

以BMS-4永磁铁氧体预烧料为原料,在加入0.8?CO3和0.5%SiO2纳米添加剂的基础上,再加入稀土氧化物Pr6O11,研究了Pr6O11的添加量对锶永磁铁氧体剩磁和矫顽力的影响规律及作用机理.当Pr6O11的添加量为1.8%时,在全自动辊道双推板窑烧结1240℃烧结24h,可以制备出Br≥410.0mT、Hcj≥250kAm-1、(BH)max≥33kJ-1的铁氧体永磁材料.     

布袋除尘器在铁氧体预烧料回转窑尾气处理中的应用

介绍了布袋除尘器的主要组成部分及工作原理,并介绍了铁氧体预烧料回转窑尾气的特点。针对预烧料回转窑尾气温度高、湿度大、含腐蚀性气体等特点,本文主要从布袋材质选择、过程控制、日常维护等方面进行设计和维护管理,以提高布袋除尘器的使用寿命。     

快淬NdFeB磁粉的组织与性能

研究了合金成分和工艺因素对产业化生产的快淬钕铁硼（NdFeB）磁粉组织与性能的影响．制备出标样性能为Br：0.67T，Hcb：435-438kA／m，Hej：812kA／m，（BH）max：74kJ／m^2的快淬NdFeB磁粉。     

M型稀土永磁铁氧体的微观结构与磁性研究

采用粉末冶金工艺,结合CaSiO_3与BBSS助熔剂的复合掺杂技术,制备了M型稀土永磁铁氧体。用费氏粒度仪测量成形用颗粒料的平均粒度,用SEM、EDS、XRD、永磁铁氧体测量仪等分析测试样品的显微结构、物相、断面形貌及磁学性能,用浮力法测定样品表观密度。结果表明:CaSiO_3与BBSS助熔剂的复合掺杂促进了M型稀土永磁铁氧体晶粒的均匀生长,改善了产品的取向度,从而明显改善了产品的磁性能及内禀矫顽力HCJ的温度系数β(HCJ),但铁氧体的居里温度略为下降。对Ca_(0.45)La_(0.45)Sr_(0.1)Fe_(10.3)Co_(0.3)O_(19-δ)预烧料,细粉碎时添加0.7%的CaSiO_3、0.4%的助熔剂BBSS(均为质量分数),经成形、烧结之后,可获得Br为455 m T,HCJ为412 k A/m,M*值为6 275.3、Hk/HCJ为95.8%的M型高性能稀土永磁铁氧体。     

SHS法工艺参数对NiZn铁氧体预烧料结构的影响

本文以还原铁粉、NiO、ZnO及Fe2O3为原料，利用自蔓延高温合成（SHS）法制备NiZnFe2O4预烧料，并且利用XRD图谱，Vegard定律等分析了产物结构。分析结果表明：SHS法可以制备纯度很高的NiZnFe2O4预烧料。试验发现，保温时间及粉料压坯密度均对SHS法制备的NiZnFe2O4预烧料的结构有一定的影响：随着保温时问的延长，产物的纯度提高，同时固溶体中的组元配比更接近配方比例；当粉料压坯相对密度为63％左右时，固溶体中的组元配比可达到配方比例。     

《湖南有色金属》2006年总目次

题目卷期页·采选·湖南黄沙坪铅锌矿一号斜井技术改造22 1 1某铝土矿延长现有工业设施服务年限的研究22 1 3铅硐山矿业有限公司选矿厂生产技术改造22 1 6硫酸烧渣制备永磁锶铁氧体预烧料的工艺研究22 1 10湖南地区成矿特征及其找矿前景分析22 2 1黄铁矿制酸烧渣生产铁精粉试验工艺研究22 2 4钨钼铋综合回收选矿试验研究22 2 7氰化提金在龙鑫矿业公司的生产实践22 2 10常宁大义山砂锡矿床形成的地质条件22 3 1河南省舞阳铁矿田太古代古地史及铁矿的形成过程研究22 3 5柿竹园多金属矿硫化矿浮选工艺研究22 3 9灰色关联分析法在选矿生产管理中…     

Magnetic and magnetostrictive properties of amorphous TbFe/FeAl multilayer thin film

Exchange coupling multilayer thin films, which combined giant magnetostriction and soft magnetic properties, were of growing interest for applications. The TbFe/FeAl multilayer thin films were prepared by dc magnetron sputtering onto glass substrates. The microstructure, magnetic, and magnetostrictive properties of TbFe/FeAl multilayer thin film was investigated at different annealing temperatures. The results indicated that the soft magnetic and magnetostrictive properties for TbFe/FeAl multilayer thin film compared with TbFe single layer film were obviously improved. In comparison with the intrinsic coercivity JHc of 59.2 kA/m for TbFe single layer film, the intrinsic coercivity JHc for TbFe/FeAl multilayer thin films rapidly dropped to 29.6 kA/m. After optimal annealing (350 ℃×60 min), magnetic properties of Hs=96 kA/m and JHc=16 kA/m were obtained, and magnetostrictive coefficient could reach to 574×10-6 under an external magnetic field of 400 kA·m-1 for the TbFe/FeAl multilayer thin film.     

Particle size dependent sinterability and magnetic properties of recycled HDDR Nd-Fe-B powders consolidated with spark plasma sintering

The dependence of the magnetic properties on the particle size of recycled HDDR Nd-Fe-B powders was investigated,with the aim to assess the reprocessing potential of the end-of-life scrap magnets via spark plasma sintering(SPS).The as received recycled HDDR powder has coercivity(H_(ci))=830 kA/m and particles in the range from 30 to 700 μm(average 220 μm).After burr milling,the average particle size is reduced to 120 μm and subsequently the H_(ci) of fine(milled) powder was 595 kA/m.Spark plasma sintering was exploited to consolidate the nanograined HDDR powders and limit the abnormal grain coarsening.The optimal SPS-ing of coarse HDDR powder at 750℃for 1 min produces fully dense magnets with H_(ci)=950±100 kA/m which further increases to 1200 kA/m via thermal treatment at 750℃for 15 min.The burr milled fine HDDR powder under similar SPS conditions and after thermal treatment results in H_(ci)=940 kA/m.The fine powder is further sieved down from 630 to less than 50 μm mesh size,to evaluate the possible reduction in H_(ci) in relation to the particle size.The gain in oxygen content doubles for 50 μm sized particles as compared with coarser fractions(200 μm).The XRD analysis for fractionated powder indicates an increase in Nd_2O_3 phase peaks in the finer(100 μm)fractions.Similarly,the H_(ci) reduces from 820 kA/m in the coarse particles(200 μm) to 460 kA/m in the fine sized particles(100μm).SPS was done on each HDDR powder fraction under the optimal conditions to measure the variation in H_(ci) and density.The H_(ci) of SPS-ed coarse fraction(200 μm) is higher than 930 kA/m and it falls abruptly to just 70 kA/m for the fine sized particles(100 μm).The thermal treatment further improves the H_(ci) to1000 kA/m only up to 100 μm sized fractions with90% sintered density.The full densification(99%) is observed only in the coarse fractions.The loss of coercivity and lack of sinterability in the fine sized particles(100 μm) are attributed to a very high oxygen content.This implies that during recycling,if good magnetic properties are to be maintained or even increase the HDDR powder particles can be sized down only up to≥100 μm.     

注射成形制备NdFeB粘结磁体

为了制备出高性价比的粘结NdFeB注射磁体，本文系统的研究了粘结剂、添加剂的含罱以及磁粉装载量对注射磁体的加工性能、磁性能等的影响规律，并从微观上揭示了其机理。本文采用低成本的陶广：快淬钕铁硼磁粉和国产尼龙6粘结剂制备出了磁性能Br为0．5158T、Heb为321kA／m、Hcj为730kA／m和（BH）max为40kl／m^3的注射磁体，其性能与日本Mate公司的RNI-50产品性能相当，而价格却低得多.     

晶间合金化Ga元素对烧结Nd-Fe-B磁性能与显微组织的影响

用晶间合金化方式直接在(NdPr)29.6(FeCuZr)69.2B1.0粉中加入0.3%Ga(质量分数,以下同),磁体的内禀矫顽力从943.5kA/m提高到1181.0kA/m。分别用晶间合金化方式和传统合金化方式在(Nd-PrDy)30.0(FeCuZr)69.0B1.0中加入0.2%Ga,前者的内禀矫顽力达到1224.0kA/m,远高于后者的971.5kA/m。显微组织结构分析表明:用晶间合金化方式加Ga后改善了边界结构,没加Ga时晶粒边界不平直,晶界处缺陷较多;加Ga后晶界平直光滑,Ga主要分布在晶界,而晶内Ga含量极低。     

Study on preparation technique and properties of magnetostrictive epoxy bonded Tb1-xPrx(Fe0.4Co0.6)1.93 composites

The magnetic and magnetostrictive properties of epoxy bonded Tb1-xPrx(Fe0.4Co0.6)1.93 (0.85≤x≤1.00) composites, prepared with different epoxy proportions using cold compression-molding technique, were investigated. It is found that the optimal conditions were with a compaction pressure of 100 MPa and a mass ratio of resin to powder of 5:100. The Tb0.1Pr0.9(Fe0.4Co0.6)1.93 composite rod had a high magnetostriction of 770 ppm at an applied magnetic field of 960 kA/m, whereas the Pr(Fe0.4Co0.6)1.93 composite reached 500 ppm at 400 kA/m. The good magnetostrictive properties of Pr(Fe0.4Co0.6)1.93 composite at low-field (≤400 kA/m) could be explained by its low anisotropy. These results indicated that the epoxy bonded Tb1-xPrx(Fe0.4Co0.6)1.93 rod samples for high Pr content of x=0.9-1.0 were of practical value.     

还原扩散法制备Sm2Fe17Nx磁粉的研究

研究了还原扩散法制备Sm2Fe17Nx磁粉过程中,还原扩散反应温度和时间对Sm2Fe17合金单相性的影响,以及Sm2Fe17合金渗氮过程中渗氮温度和时间对Sm2Fe17Nx磁粉性能的影响.结果表明当还原扩散反应温度为1423K、反应时间为5小时能得到均相单一的Sm2Fe17合金;在728K温度下渗氮3.5小时后,400目～500目的Sm2Fe17Nx磁粉的各项磁性能达最大值Br=0.8943T,Hc=325.8kA/m,Hcj=420.3kA/m,(BH)max=78.6kJ/m3.     

工业生产高综合性能烧结 Nd-Fe-B永磁关键技术研究

通过优化合金成分设计和改进合金铸锭按需分配技术、磁场取向成型技术以及烧结技术，应用全部国产设备与国内通用的工业生产烧结Nd-Fe-B永磁的原材料，避免使用镓等稀有贵重金属元素，实现了N45H烧结Nd-Fe-B磁体的工业化生产，其典型磁性能为Br=1.386T(13.86kGs),BHc=1059kA/m(13.32kOe),JHc=1418kA/m(17.83kOe),Hk=1357kA/m(17.06kOe),(BH)max=364kJ/m^3(45.8MGOe)。，SEM观察和XRD分析结果表明，制造的N45H烧结Nd-Fe-B磁体具有良好的取向度和晶粒细小而均匀的显微组织。     

钴在提高钕铁硼合金居里温度和降低温度系数中的作用

本研究通过添加钴和其它微量元素,使钕铁硼永磁合金的居里温度提高,温度系数降低;并在改善合金温度稳定性的同时,使之仍保持高的磁性能。所制合金具有下述良好性能:Br=1.29T;iHc=648kA/m;bHc=584kA/m;(BH)_max=304kJ/m3;Tc=500℃;α_Br=0.015%/℃。     

某难选铁矿中性磁化焙烧-磁选试验研究

在中性气氛中,对以菱铁矿为主的某复杂难选铁矿石进行了磁化焙烧-磁选工艺研究。试验结果表明,最优工艺条件为：焙烧温度700℃,焙烧时间60 min,磨矿细度95％-0．044 mm,粗选作业磁场强度均为151．24 kA/m,精选磁场强度39．80 kA/m。获得TFe品位55．55％,回收率720．1％的铁精矿。