Abstract Boron-bearing slag is a typical secondary resource of boron (B) and magnesium (Mg). However, the boron dispersed in the amorphous phase, which is difficult to recover from the boron-bearing slag. This study investigated the effect of supergravity field on the competitive crystallization behavior of B, Si, and Mg in boron-bearing slag, and developed an efficient method for two-stage separation of olivine (Mg2SiO4) and suanite (Mg2B2O5) from the slag. In stage 1, the M g 2 + was preferentially crystallized into olivine with the S i O 4 4 - rather than B 2 O 5 4 - at 1623 K to 1473 K, and the olivine crystals were efficiently separated from the boron-bearing slag melt under the supergravity field. Due to the separation of olivine in the stage 1, the S i O 4 4 - was depleted and a favorable condition for single crystallization of suanite was created in the remaining boron-rich slag. Thus in stage 2, the B 2 O 5 4 - and M g 2 + were adequately crystallized into suanite at 1473 K to 1323 K, and the suanite crystals were recovered further from the separated boron-rich slag melt in the supergravity field. Moreover, the high purity and high crystallinity of the suanite and olivine separated from the boron-bearing slag confirmed the enhancement of supergravity field on the solid-liquidseparation in a complex slag system.

中文翻译：

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B、Si、Mg的竞争结晶及超重力场含硼渣中橄榄石和酸橄榄石的两段分离

摘要 含硼渣是典型的硼(B)和镁(Mg)次生资源。然而，硼分散在非晶相中，很难从含硼炉渣中回收。本研究研究了超重力场对含硼炉渣中 B、Si 和 Mg 竞争结晶行为的影响，并开发了一种从炉渣中两级分离橄榄石 (Mg2SiO4) 和橄榄石 (Mg2B2O5) 的有效方法。在第一阶段，Mg 2 + 优先与SiO 4 4 - 而不是B 2 O 5 4 - 在1623 K至1473 K结晶成橄榄石，橄榄石晶体与含硼炉渣有效分离在超重力场下融化。由于橄榄石在第一阶段的分离，S i O 4 4 - 被耗尽，并且在剩余的富硼渣中创造了硫酸盐单晶化的有利条件。因此，在第2阶段，B 2 O 5 4 - 和Mg 2 + 在1473 K 至1323 K 下充分结晶成suanite，并且在超重力场中从分离的富硼熔渣熔体中进一步回收suanite 晶体。此外，从含硼渣中分离出的硫酸盐和橄榄石的高纯度和高结晶度证实了超重力场对复杂渣体系中固液分离的增强作用。