耐火材料 ›› 2024, Vol. 58 ›› Issue (6): 496-500.DOI: 10.3969/j.issn.1001-1935.2024.06.007

• 研究开发 • 上一篇    下一篇

Pr6O11加入量对菱镁尾矿制备Mg2SiO4-MgO复相砂性能的影响

林浩鑫1), 魏合意2), 田琳1), 刘晓妍1), 解重重1), 李国华1)   

  1. 1)辽宁科技大学 材料与冶金学院 辽宁鞍山 114051
    2)唐山时创高温材料股份有限公司 河北唐山 063000
  • 收稿日期:2024-04-28 出版日期:2024-12-15 发布日期:2024-12-20
  • 通讯作者: 田琳,女,1977年生,硕士,教授。E-mail:tianlingui96@163.com
  • 作者简介:林浩鑫:男,2000年生,硕士研究生。E-mail:1273889590@qq.com
  • 基金资助:
    *国家自然科学基金项目(U20A20239)。

Effect of Pr6O11 addition on properties of Mg2SiO4-MgO composite sand prepared from magnesite tailings

Lin Haoxin, Wei Heyi, Tian Lin, Liu Xiaoyan, Xie Chongchong, Li Guohua   

  1. First author’s address:College of Materials and Metallurgy,University of Science and Technology Liao-ning,Anshan 114051,Liaoning,China
  • Received:2024-04-28 Online:2024-12-15 Published:2024-12-20

摘要: 为提高菱镁尾矿的综合利用率,解决其堆积污染问题,以浮选后菱镁尾矿为原料,分析纯Pr6O11为添加剂,经1 600 ℃保温3 h,通过固相法制备Mg2SiO4-MgO复相砂,研究了Pr6O11加入量(加入质量分数分别为0、1%、2%、3%和4%)对复相砂物相组成、显微结构和物理性能的影响。结果表明:1)烧后试样主晶相均为Mg2SiO4,次晶相为MgO和MgAl2O4,当Pr6O11加入量≥2%(w)时,生成Ca2Pr8(SiO4)6O2(硅酸钙镨);2)添加Pr6O11会促进Mg2SiO4晶体长大,同时将晶间低熔点CaMgSiO4替换为高熔点Ca2Pr8(SiO4)6O2,促使复相砂抗热震性随Pr6O11加入量的增加不断提高;3)适量添加Pr6O11会促进试样烧结,提升试样常温抗折强度,当Pr6O11加入量为2%(w)时,试样性能最优,其体积密度为3.03 g·cm-3,显气孔率为5.4%,常温抗折强度为65.2 MPa,抗折强度保持率为34.5%,抗热震性良好。

关键词: 菱镁尾矿, Pr6O11, Mg2SiO4-MgO复相砂, Ca2Pr8(SiO4)6O2, 显微结构

Abstract: To improve the comprehensive utilization rate of magnesite tailings and solve the problem of accumulation pollution,Mg2SiO4-MgO composite sand was prepared by the solid phase method with flotation magnesite tailings as the raw material and analytically pure Pr6O11 as the additive,firing at 1 600 ℃ for 3 h.The effects of the Pr6O11 addition (0,1%,2%,3% and 4%,by mass) on the phase composition,microstructure and physical properties of the composite sand were studied.The results show that:(1)the main crystal phase of the fired samples is Mg2SiO4,and the secondary crystal phases are MgO and MgAl2O4;when the Pr6O11 addition is ≥2%,Ca2Pr8(SiO4)6O2 is formed;(2)Pr6O11 can promote the growth of Mg2SiO4 crystals and replace low melting point CaMgSiO4 with high melting point Ca2Pr8(SiO4)6O2,which gradually improves the thermal shock resistance of the composite sand with the increase of the Pr6O11 addition;(3)the proper Pr6O11 addition promotes the sintering and improves the cold modulus of rupture of the specimen;and the specimen with 2% Pr6O11 shows the best performance with the bulk density of 3.03 g·cm-3,apparent porosity of 5.4%,cold modulus of rupture (CMOR) of 65.2 MPa,residual MOR retention ratio of 34.5%,and good thermal shock resistance.

Key words: magnesite tailings, praseodymium oxide, forsterite-periclase composite sand, Ca2Pr8(SiO4)6O2, microstructure

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