滇东磷矿风化型矿石的判别指标讨论及次生风化富集作用

• 作 者: 戈定夷 刘永先 曾允孚
• 机 构: 成都理工学院
• 出 处: 矿物岩石
• 发表日期: 1994年03期
• 关键词: 滇东 次生富集作用 矿石结构 磷块岩 下寒武统 磷矿石 风化作用 孔隙度 古风化壳 碳酸盐含量

风化型磷矿石－风化磷块岩是滇东最主要的磷矿石，为判别矿石为原生成风化磷块岩，前人已提出过１０余种作为判别标志的风化指标，但是这些指标的计算仅以矿石的化学组成为依据。笔者研究后指出，应以次生风化作用过程中磷块岩的组成和结构变化为基础，再合理使用上述某些判别指标，才能正确确定风化矿石，决定其利用价值和方法。笔者还指出，在次生风化作用中被溶蚀的不仅是碳酸盐，只要条件适当，石英和粘土矿物也可以溶蚀，使磷矿石品位增高，结构疏松，成为有利于洗选的优质矿石。

Weathered phosphate rock - weathered phosphorite rock is the most important phosphate rock in eastern Yunnan. In order to distinguish the ore from the original formation of weathered phosphorite rock, more than 10 kinds of weathering indicators have been proposed as discriminant marks. However, Calculations are based solely on the chemical composition of the ore. After the study, the author pointed out that based on the composition and structure change of phosphorite during the process of secondary weathering, it is necessary to use some of the above discriminant indexes reasonably to determine the weathering ore correctly and determine the value and method of its utilization. The author also points out that carbonate is not only eroded in secondary weathering. As long as the conditions are right, quartz and clay minerals can also dissolve, resulting in higher grade and loose structure of phosphate rock, making it a good ore for washing and dressing.