关键词: 磷矿;磷酸;分解;响应曲面

Abstract: Based on phosphorite resources which largely exist in Yunnan Province, effects of phosphoric acid concentration, liquid-solid ratio and temperature on the conversion rate of phosphorite were investigated.A regression model of phosphoric acid decomposing phosphorite process were established through experimental design of response surface method(RSM).The relationship among the conversion of phosphate rock and the phosphoric acid concentration,liquid-solid ratio and temperature were reflected by this regression model.The optimal technological conditions of decomposition were temperature of 110℃,liquid-solid ratio of 9 and phosphoric acid concentration of 42% P2O5through this model.And the conversion rate of phosphate rock reached 99.29% under this process condition.Compared with the predicted value, the relative error was less than 1%.It indicated that the relationship between the parameters could accurately reflected by the regression model.Thua, the prediction and optimizaiton about decomposition of phosphate rock could be used this model.

Key words: phosphorite;phosphoric acid;decomposition;response surface