耐火材料 ›› 2023, Vol. 57 ›› Issue (2): 104-106.DOI: 10.3969/j.issn.1001-1935.2023.02.003

• 研究开发 • 上一篇    下一篇

煅烧温度对菱镁矿尾矿制备MgO-MgAl2O4-Mg2SiO4复相多孔材料性能的影响

周萍, 马北越, 任鑫明   

  1. 东北大学 冶金学院 辽宁沈阳 110819
  • 收稿日期:2022-06-13 出版日期:2023-04-15 发布日期:2023-04-17
  • 作者简介:周萍:女,1998年生,硕士研究生。E-mail:32471883@qq.com
  • 基金资助:
    国家自然科学基金资助项目(U20A20239,U21A2057)。

Effect of calcination temperature on properties of MgO-MgAl2O4-Mg2SiO4 complex porous materials prepared from magnesite tailings

Zhou Ping, Ma Beiyue, Ren Xinming   

  1. First author’s address: School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
  • Received:2022-06-13 Online:2023-04-15 Published:2023-04-17

摘要: 以菱镁矿尾矿和二次铝灰为原料,按m(菱镁矿尾矿)∶m(二次铝灰)=7∶3配料,混料、成型后分别经1 200、1 300、1 400和1 500 ℃煅烧,制备了MgO-MgAl2O4-Mg2SiO4试样,并研究了煅烧温度对其性能的影响。结果表明:随着煅烧温度的升高,试样的体积密度和线收缩率随之增大,常温耐压强度基本呈增大的趋势,而显气孔率相应减小;当煅烧温度从 1 300 ℃升高到1 400 ℃时,显气孔率变化尤为明显,分析认为这与镁铝尖晶石的形成有关。在满足显气孔率超过40%的条件下,试样经1 300 ℃煅烧后的常温耐压强度较高。因此,最佳煅烧温度为1 300 ℃。

关键词: 菱镁矿尾矿, 二次铝灰, 镁橄榄石, 镁铝尖晶石, 煅烧温度

Abstract: MgO-MgAl2O4-Mg2SiO4 specimens were prepared by mixing raw materials according to m(magnesite tailings)∶m(secondary aluminum ash)=7∶3,shaping,and calcining at 1 200,1 300,1 400 and 1 500 ℃,respectively.The effect of the calcination temperature on the properties of the prepared specimens was studied.The results show that with the increase of the calcination temperature,the bulk density and the linear shrinkage of the specimens increase,the cold compressive strength basically increases,while the apparent porosity decreases accordingly;when the calcination temperature increases from 1 300 ℃ to 1 400 ℃,the apparent porosity of the specimens changes significantly.This is related to the formation of magnesium aluminate spinel.Under the condition of the apparent porosity exceeding 40%,the specimens calcined at 1 300 ℃ has a higher cold compressive strength.Therefore,the optimum calcination temperature is 1 300 ℃.

Key words: magnesite tailings, secondary aluminum ash, forsterite, magnesium aluminate spinel, calcination temperature

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