In this study, a novel method was developed for direct preparation of magnesium borate (Mg₂B₂O₅) ceramic from boron-bearing slag. The amorphous boron was efficiently enriched into Mg₂B₂O₅ via crystalline phase transformation in the condition of B/S (B₂O₃/SiO₂) = 1.20 and wt.% (MgO) = 36.00. High-purity Mg₂B₂O₅ crystals were fully recovered from molten slag by super-gravity separation at G ≥ 500 and t ≥ 240 s. The Mg₂B₂O₅ ceramic was directly prepared at various temperature by using the recovered Mg₂B₂O₅, and the Mg₂B₂O₅ ceramic displayed a favourable microwave dielectric properties including the dielectric constant (${\epsilon }_{\text{r}}$) of 6.05, the quality factor (Q × f) of 38,147 GHz and the temperature coefficient of resonant frequency (TCF) of -20.98 ppm/K. Compared with synthetic methods that use high-purity oxides, this study provides a green and economical method for direct utilisation of industrial slag to prepare microwave dielectric materials.

在这项研究中，开发了一种新方法，用于从含硼炉渣中直接制备硼酸镁（Mg ₂ B ₂ O ₅）陶瓷。在B / S（B ₂ O ₃ / SiO ₂）＝ 1.20且重量％（MgO）＝ 36.00的条件下，非晶态硼通过结晶相转变有效地富集到Mg ₂ B ₂ O _5中。高纯度的Mg ₂乙_2分ö ₅的结晶，充分从熔渣由超重力分离回收在ģ ≥500和吨≥240秒。镁₂ B ₂ O使用回收的Mg ₂ B ₂ O ₅在不同温度下直接制备₅陶瓷，并且Mg ₂ B ₂ O ₅陶瓷显示出良好的微波介电性能，包括介电常数（${\epsilon }_{\text{[R}}$）为6.05，品质因数（Q × f）为38,147 GHz，谐振频率温度系数（TCF）为-20.98 ppm / K。与使用高纯度氧化物的合成方法相比，本研究提供了一种绿色经济的方法，可直接利用工业炉渣制备微波介电材料。