云南省主要磷石膏化学特性分析

 云南省磷石膏（PG）资源农业利用的可行性已成为磷复肥工业实现可持续发展的关键。对昆明地区3个代表性磷石膏堆放点（草铺、上蒜、古城）不同堆放时间（≤1年、1~3年、≥3年）磷石膏的主要化学特性进行了调查。结果表明，磷石膏酸性较强（pH<5）、有机质（OM）含量最高值只有64mg/kg，而全磷（TP）、速效磷（AP）和有效硫（AS）含量却较高，其最高值分别达170g/kg, 4345mg/kg和489mg/kg，镉（Cd）、砷（As）含量平均分别为17mg/kg和147mg/kg。各堆放时间均以上蒜堆放点磷石膏的酸性最强、全磷和速效磷含量最高，而磷石膏中Cd含量则是草铺堆放点最低；随堆放时间的延长，各堆放点磷石膏pH值均随之显著上升、速效磷和有效硫含量也随之有所增加、As含量则随之呈现下降趋势。最后就磷石膏资源的农用状况及可行性进行了讨论，并指出了云南磷石膏农用的新途径。

The Chemical Characteristics Analysis of Phosphogypsum in Yunnan Province

The feasibility of phosphogypsum (PG) utilization in agricultural may be very important for sustainable development of phosphate fertilizer and compound fertilizer industry in Yunnan Province The major chemical characteristics of phosphogypsum in Kunming City, Yunnan Province under different rock phosphate origins (Caopu, Shangsuan and Gucheng ) and stacking time (≤1a, 1~3a, ≥3a) were determined The results indicated that the PG pH values were < 5, and the content of organic matter (OM) in PG was lower than 64mg/kg, but the content of total phosphorus (TP), available phosphorus (AP) and available sulphur (AS) in PG were relatively high, whose of the maximum values were 170g/kg, 4345mg/kg and 489mg/kg, respectively And the average content of cadmium (Cd) and arsenic (As)in PG were 17mg/kg and 147mg/kg, respectively. The acidity, AP and TP content in PG in Shangshan town were higher than in Gucheng and Caopu town. With increasing of stacking time of PG in all the three places, PG pH value increased significantly, and available phosphorus and sulphur content also showed increase trend but As content appeared decrease trend . Finally, the status and feasibility of PG utilization in agricultural production were summarized and discussed, and the further directions of PG utilization in agricultural production in Yunnan Province were proposed.