The liquid alkali decomposition method represents a relatively clean smelting process for the treatment of the mixed rare earth concentrate derived from Bayan Obo. However, the production process generates a considerable quantity of alkaline wastewater, which presents a significant obstacle to the large-scale application of this process. Accordingly, the reduction and high-value treatment of rare earth alkaline wastewater represents a pressing need and challenge. This paper presents a novel approach to the treatment of rare earth alkaline wastewater, which has the potential to revolutionize the way such wastewater is handled. The proposed method involves a series of processes, including mineral phase transformation, ultrasonic enhanced water washing, causticization treatment, and glass preparation. These processes not only reduced the volume of alkaline wastewater by over 50% compared to traditional treatment methods, but challenged the conventional wisdom surrounding the treatment of alkaline wastewater, resulted in the conversion of NaF, Na3PO4, and Na2CO3 into a mixed calcium salt, which contains CaF2, Ca3(PO4)2, and CaCO3. And the mixed calcium salt can then employed in the preparation of high-performance glass. This process not only circumvents the deficiencies associated with the low purity and value of the final product when NaF, Na3PO4, and Na2CO3 are separated individually, but it also allows for the reuse of the generated NaOH, thereby achieving high-value utilization of the alkaline wastewater. This paper offers valuable insights into the treatment of alkaline wastewater from various rare earth minerals treated by the liquid alkali decomposition method.

中文翻译：

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通过矿物相变和超声波增强稀土碱饼洗涤和碱性废水处理


液碱分解法是一种相对清洁的冶炼工艺，用于处理源自 Bayan Obo 的混合稀土精矿。然而，生产过程会产生大量的碱性废水，这对该工艺的大规模应用构成了重大障碍。因此，稀土碱性废水的减少和高价值处理代表了紧迫的需求和挑战。本文提出了一种处理稀土碱性废水的新方法，该方法有可能彻底改变此类废水的处理方式。所提出的方法涉及矿物相变、超声增强水洗、苛化处理和玻璃制备等一系列过程。与传统处理方法相比，这些过程不仅将碱性废水的体积减少了 50% 以上，而且挑战了围绕碱性废水处理的传统观点，导致 NaF、Na3PO4 和 Na2CO3 转化为混合钙盐，其中含有 CaF2、Ca3（PO4）2 和 CaCO3。然后，混合钙盐可用于制备高性能玻璃。该工艺不仅避免了单独分离 NaF、Na3PO4 和 Na2CO3 时与最终产品纯度和价值低相关的缺陷，而且还允许对生成的 NaOH 进行再利用，从而实现碱性废水的高价值利用。本文为处理液碱分解法处理的各种稀土矿物的碱性废水提供了有价值的见解。