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矿石储量约110万吨的Dong Pao小型氟碳铈矿矿床位于越南的最北端。在重晶石-氟石-氟碳铈矿矿化过程中形成的碳酸盐矿体,其部位和成因与第三纪碱性岩岩浆作用有密切联系。该矿床的特点在于形成了厚度超过30m的剧烈风化带,从而明显提高了稀土含量。而矿石的成因和共生组合决定了选矿工艺的复杂性。根据实验室和半工业试验,提出一种对氟碳铈矿稀土矿石来说属非常规的选矿方法,即作为一个主要工序在第一阶段对原矿石进行洗选。洗选后的细粒产品中含有30％的稀土氧化物,稀土回收率为63％。这种品位相当低的精矿,由于其性能特殊,需采用一种新的分解方法进行冶金加工。其特点是在温度仅仅200—300℃的条件下,用硫酸进行固相化学分解。该选矿方法的其它工序还包括重晶石精矿浮选,和提取含有约38％稀土氧化物的二次氟碳铈矿精矿的强磁场磁选,二次精矿可与一次精矿混合。
The Dong Pao Small Bastnaesite Deposit, which contains about 1.1 million tonnes of ore, is located on the northernmost tip of Vietnam. The carbonate ore bodies formed during the mineralization of barite-fluorite-bastnaesite are closely related to the tectonic play of Tertiary alkaline rock magmatism. The deposit is characterized by the formation of severe weathering zones with thicknesses in excess of 30 m, which significantly increases the RE content. The ore causes and symbiotic combinations determine the complexity of beneficiation process. According to laboratory and semi-industrial tests, an unconventional beneficiation method for bastnaesite rare earth ore is proposed, that is, the primary ore was washed in the first stage as a major process. After washing the fine product contains 30% rare earth oxides, rare earth recovery rate of 63%. This grade of very low concentrate, due to its special properties, requires a new decomposition method for metallurgical processing. It is characterized by the temperature of only 200-300 ℃ under the conditions of the solid phase chemical decomposition with sulfuric acid. Other processes for the beneficiation process include barite concentrate flotation and strong magnetic field magnetic separation of secondary bastnaesite concentrates containing about 38% rare earth oxides, which can be mixed with primary concentrates .