云南滇池地区风化磷块岩的风化指标研究

长期风化作用使云南滇池地区形成了大面积的风化磷块岩矿石,这种矿石是制取高效磷肥的优质原料。为了圈定这些风化磷块岩矿石,须确定适宜的风化指标。笔者通过风化磷块岩形成过程化学组分变化研究,首次提出将风化指标分为“直接法”和“间接法”两类,进而提出ＣＯ２风化指标为直接法中指标,２Ｐ２Ｏ５＋Ａ．Ｉ＾１）风化指标为间接法中推荐指标。

A STUDY ON THE WEATHERING INDEX OF WEATHERED PHOSPHORITE IN THE DIANCHI AREA OF YUNNAN PROVINCE

The carbonate-type phosphorite has been transformed into weathered phosphorus ores as a result of long-term weathering in the Dianchi area of Yunnan Province. The weathered phosphorus ores are high-graed materials for the production of high quality phosphate fertilizer. It is necessary to determine the proper weathering index so as to define this kind of weathered phosphorus ores. Research on weatheing index was done on the basis of the formation mechanism of weachered phosphorus ores, the changes of chemical compositions of weathered and primary phosphorus ores, and the chemical analysis data of phosphorus ores. It first suggested that the weathering index is divided into two classes "direct method" and "indirect method". Therefore, the CO2 weathering index is recommended as the index of the "direct method" and the 2P2O5+A. I weathering index as the index of the "indirect method".