选择性浸出中低品位磷块岩实验研究

用传统的选矿工艺，如物理分选或者浮选来富集含碳酸盐矿物的磷矿石都很困难，由于碳酸盐和磷酸盐矿物有极其相似的物理化学特性，一般沉积型磷矿石用焙烧和选择性酸浸的方法对其进行富集。选择性浸出是一种具有应用前景的富集方法。实验采用乙酸酸浸磷块岩，使白云石分解，达到富集磷矿的目的。结果表明：乙酸分解白云石的主要影响因素有反应温度、粒度、酸的浓度、反应时间等。在最佳实验条件下P2O5的质量分数从原矿的19.72%提高到33.78%，白云石的分解率为27.45%。

Study of selective leaching of low-grade phosphate rock in acid

The beneficiation of phosphate ores containing carbonate gangue by conventional techniques，such as physical separation methods or flotation，is very difficult due to the similarities in physic-chemical properties of constituent minerals present in the system.Generally，sedimentary phosphate ores can be processed by calcinations and selective acid leaching methods.The selective leaching with acetic acid is a promising beneficiation way.Acetic acid was used to reduce the carbonate content of the phosphate rock，in order to enrich the content of P₂O₅.Experiment result indicated:the main factors of influencing acetic acid decompose dolomite were temperature，particle size，acid concentration，and reaction time etc..Under the optimal operating conditions，it was found that the mass fraction of P₂O₅ could be raised from 19.72% to 33.78% along with corresponding decomposition rate of dolomite 27.45%.