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中南大学学报(自然科学版)

Journal of Central South University

第32卷    第1期    总第137期    2001年2月

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文章编号:1005-9792(2001)01-0025-04
用超纯铁精矿生产锶铁氧体预烧料
及其焙烧动力学
张清岑,肖 奇

(中南大学矿物工程系,湖南长沙 410083)

摘 要: 锶铁氧体是应用最广的永磁铁氧体,当前其生产原料主要是铁红和铁鳞,但这2种原料来源有限,且价格昂贵,因此寻找质优价廉的锶铁氧体原料已成为当务之急.作者采用分散与选择性聚团磁选新工艺制备出w(Fe)=71.88%,w(SiO2)<0.5%的超纯铁精矿.锶铁氧体预烧生产工艺是:采用超纯铁精矿氧化和铁氧体生成反应,在配比n为5.6,精矿粒度低于2μm,预烧温度为1 553 K,保温时间超过1 h和添加剂适量的工艺条件下,制备出比饱和磁化强度σS>71.5 A/(m2·kg)的优质锶铁氧体预烧料.用缺陷化学理论和焙烧动力学进行分析,结果表明:Fe3+
Sr2+通过O2-晶格互相扩散并以Sr2+扩散为主,在SrFe12O19-Fe2O3,SrO-SrFe12O19界面发生固相反应,生成锶铁氧体.

 

关键字: 超纯铁精矿;锶铁氧体;缺陷化学;焙烧动力学

Preparation of strontium ferrite powder by iron
concentrate and its sintering dynamics
ZHANGQing-cen,XIAOQi

Department of Mineral Engineering, Central South University, Changsha 410083, China

Abstract:Strontium ferrite has been used widely. Nowadays, the main rawmaterials for strontium ferrite are Fe2O3andFe3O4, which are expensive and limited. So it is necessary to find newkinds of rawmaterials. Magnetite separation has been adopted to pretreat rawmaterials, and the superpure iron concentrate of w(Fe)=71.88%,w(SiO2)<0.5% can be obtained. In the process of the preparation of strontium ferrite powders, the oxidation of the magnetite and the formation of strontium ferrite have been finished at the same time by using novel technique. Under the following condition, that is, molar rationis 5.6, size of concentrate is less than 2μm, sintering temperature is 1553 K, sintering time is more than one hour and properreagents, the strontiumferrite powderwithgood results such as σS>71.5 A/(m2·kg) has been got. The study of the dynamics and the analysis of defect chemical theory on the reaction of the formation of strontium hexaferrites phase expresses that Fe3+and Sr2+ mutually diffuse through the crystal lattice of O2-, especially Sr2+diffusion is primary, the solid reaction for the appearance of strontium ferrite take places in the interfaces of Sr Fe12O19- Fe2O3and SrO-Sr Fe12O19respectively.

 

Key words: superpure iron concentrate; strontium ferrite; defect chemistry; sintering dynamics

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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