钾长石-萤石-硫酸-氟硅酸体系提钾工艺研究

The Study on Extracting Potassium Process of Potash Feldspar-Fluorite-SulphuricAcid-Fluosilicic Acid System

实验研究了钾长石-萤石-硫酸-氟硅酸体系提钾工艺过程。结果表明,该体系下提钾优化工艺条件为:m(萤石):m(钾长石)=0.35:1,质量分数为60%的硫酸、10%的氟硅酸用量分别按m(H2SO4):m(钾长石)=1.35:1、m(H2SiF6):m(钾长石)=0.162:1,反应温度为120℃、反应时间为3.5 h,在此条件下钾的提取率达到97.2%。考虑氟化学低温腐蚀钾长石氟元素后续的循环利用,可极大地降低钾长石矿物提钾的成本,因此本工艺具有很好的工业应用前景。

The experiment has studied the system of potash feldspar-fluorite-sulphuric acid-fluosilicic acid to extract potassium.The study has showed that the best extracting potassium process condition is m(fluorite):m(potash feldspar)=0.35:1,the quantities of 60% sulphuric acid and the 10% fluosilicic acid are m(H2SiF6):m(potash feldspar) =1.35:1 and m(H2SiF6):m(potash feldspar)=0.162:1 respectively,the reaction time is 3.5 h,reaction temperature is 120 ℃.In this condition,the highest extraction yield of potassium can reach to 97.2%.Considering fluorine chemistry eroding potash feldspar in low temperature condition,the cycling use of fluorineelement in the followed process can reduce the cost of extracting potassium,which has a favorable industry prospect.