Preparation of MgB2O5 whiskers from reverse flotation magnesite tailings

doi:10.3969/j.issn.1001-1935.2025.03.001

Abstract

Abstract: Using reverse flotation magnesite tailings as a magnesium source,Mg₂B₂O₅ whiskers were synthesized via a molten salt method in order to improve the recycling utilization of magnesite tailings and find an environmental friendly magnesium source for MgB₂O₅ whiskers.The effects of the tailings activating treatment,reaction temperature (700,800 and 900 ℃),and mass ratio of boric acid to magnesite tailings (B/Mg mass ratio=0.62,1.24,1.86 or 2.48) on the phase composition and microstructure of the whiskers were investigated.The results indicate that the aspect ratio of Mg₂B₂O₅ whiskers initially increases and then decreases with the B/Mg mass ratio increasing,reaching the maximum value at a ratio of 1.86.Furthermore,800 ℃ is identified as the optimal temperature for the growth of Mg₂B₂O₅ whiskers; whisker formation is difficult below this temperature,while excessively high temperatures lead to whisker coarsening and a reduction in the aspect ratio.The ball milling and light burnt treatment of the magnesite tailings can disrupt pseudomorph after decomposition,and reduce the particle size,thereby enhancing the activity of the magnesium source and yielding uniform-sized Mg₂B₂O₅ whiskers with a high aspect ratio.

Key words: Mg₂B₂O₅ whiskers, molten salt method, pseudomorph, aspect ratio

摘要： 为了提高菱镁矿尾矿的回收利用,且寻找一种环保的镁源制备MgB₂O₅晶须,以反浮选菱镁矿尾矿作为镁源,利用熔盐法合成Mg₂B₂O₅晶须。研究了尾矿活化处理、反应温度(700、800和900 ℃)以及硼酸与尾矿质量比(定义为硼镁比,分别为0.62、1.24、1.86和2.48)对Mg₂B₂O₅晶须物相组成和显微结构的影响。结果表明:Mg₂B₂O₅晶须的长径比随着硼镁比的增加先增加后减小,当硼镁比为1.86时,达到最大值;800 ℃为MgB₂O₅晶须生长的最佳温度,低于此温度难以生成晶须,而温度过高则会导致晶须粗化,长径比减小;球磨和轻烧处理菱镁矿尾矿可破坏尾矿分解后存在的母盐假相,减小粒径,从而提高镁源活性,以此为镁源可获得尺寸均匀和高长径比的Mg₂B₂O₅晶须。

关键词: MgB₂O₅晶须, 熔盐法, 母盐假相, 长径比

CLC Number:

TQ175

Dong Zeming, Dong Zeguang, Wang Shuxing, Liu Zhaoyang. Preparation of MgB₂O₅ whiskers from reverse flotation magnesite tailings[J]. Refractories, 2025, 59(3): 185-191.

董泽明, 董泽光, 王疏星, 刘朝阳. 反浮选菱镁矿尾矿制备MgB₂O₅晶须的研究[J]. 耐火材料, 2025, 59(3): 185-191.

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Preparation of MgB₂O₅ whiskers from reverse flotation magnesite tailings

反浮选菱镁矿尾矿制备MgB₂O₅晶须的研究

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