含稀土磷精矿湿法制磷酸过程稀土的浸出规律

The leaching rule of rare earths in production of phosphoric acid by dehydrate process with phosphate concentrates bearing rare earths

为查明二水法制磷酸过程稀土的走向规律,以贵州织金含稀土磷精矿为研究对象,在实验室模拟二水物湿法磷酸生产过程,研究了不同工艺条件下稀土的浸出规律.研究结果表明,在温度75℃,酸过量系数1.25,液固比4:1,反应时间4 h的条件下,稀土的浸出率最高为53.45%.当浸出率综合考虑磷和稀土的浸出率时,最佳的工艺条件为:温度75℃,酸过量系数1.25,液固比3:1,反应时间4 h的条件下,含稀土磷精矿中P2O5的浸出率为96.85%,稀土的浸出率为52.26%.

In order to ascertain the distribution of rare earths in production of phosphate by dihydrate process,the main participants of this study is Zhijin phosphate concentrates bearing rare earths in Guizhou Province.The production process of dihydrate wet-process phosphoric acid in the laboratory is stimulated and the leaching rules of rare earth are investigated under different conditions.The test results show that when the leaching temperature is 75 ℃,the excess coefficient of sulfuric acidis 1.25,liquid to solid ratio 3：1,time consumption is 4 hours,the highest leaching rates of Re2O3 is 53.45%.Under the optimum conditions the leaching temperature is 75 ℃,the excess coefficient of sulfuric acid 1.25,liquid-to-solid ratio 3：1 and time consumption 4 hours.The leaching rates of P2O5 and Re2O3 are 96.85% and 52.26%,respectively.