Basic Research Of A New Technology For Extract Potassium And Aluminum From Potash Feldspar By Fluorine Chemical Method

Potash,Bauxite is one of important and shortage strategic resource in our country.On the one hand,more than 60 percent of Potash,Bauxite need to imported per year.On the other hand,China’s insoluble potassium-rich mineral resources is extremely rich,which is rich in potassium,aluminum.But it did not be developed in industrial,because we lack of reasonable technical route.How to take advantage of scale insoluble potassium-rich mineral resources to extrac potassium and aluminum in economic way is the major technical problems that world’s science and technology workers studied a century of years.Study a comprehensive utilization of feldspar process route by fluorine chemistry way,through researching the process characteristics,reactor,residual fluorine in products,reaction rate and the decomposition rate and so on.Base on this,providing theoretical basis for the comprehensive development and industrialization of feldspar by fluorine chemical reaction.Studies show that:1,the method of fluorine chemistry can efficient utilization of the raw materials and the product included potassium sulfate,aluminum oxide,quartz sand,gypsum and other products.The process is simple and low cost of production.2,Pipe reactor was first introduced in the process.Compared with tank reactor,the pipe reactor have better performance in feldspar fluorine chemical corrosion reaction,elemental fluorine recycling,producing strong continuity,easier project to enlarge.Experimental studies have shown:in the reaction process that the K-feldspar was corroded by fluorine chemical,the amount of fluoride acid varies from 1:1:3 to 1:3:3,sulfuric acid dosage varies from 1:3:0.5 to 1:3:3,the reaction the content of total unrecycled fluorine in the reaction product calcined at 400 ℃ range from 1.8%to 5%,the decomposition rate of potash feldspar range from 84%～97%.The content of the uncycling lowest fluorine was 1.78%at a reaction temperature of 70 ℃,the ratio of 1:3:3 when the decomposition rate of potash feldspar was 93%.It was also best for the decomposition rate of potash feldspar.Qualitative and semi-quantitative of XRF analysis showed:1,The mainly fluoride in the reaction residue after the reaction of fluorine chemistry is A1F3,KF,K3AlF6,K2SiF6.2,The insoluble residue containing mainly fluoride for AlF3,K2SiF6.XRD analysis showed that:in the reaction residue and insoluble slag,the mainly fluoride AlF3 and K2SiF6 range increases with an increase in the amount of fluoride acid in the ratio of 1:1:3 to 1:3:3,the range increases with the amount of sulfuric acid in ratio of 1:3:0.5 to 1:3:3.At a reaction temperature of 30～80 ℃,it decrease with increasing temperature,the reaction time in the range of 13～62min with time increases.Thus reducing the amount of fluorosilicic acid and sulfuric acid,or increasing the reaction temperature and reaction residence time helps to reduce the generation of AlF3 and K2SiF6,improve the recycling rate of fluorine.The results show that:fluoride acid in the pipeline reactor reaction order b is 0.2438,sulfuric acid in the pipeline reactor reaction order c is 0.4249,activation energy of the reaction process Ea=19.5695kJ mol-1.In the pipeline reactor fluorine chemical reaction decomposition process,increasing the concentration of fluorosilicic acid reaction,the concentration of sulfuric acid,and the reaction temperature can significantly improve the rate of decomposition of the feldspar,the overall productivity of potassium feldspar also be increased.The differential equations was Derived,mathematical tools MATLAB loop integral calculation method can be used under certain conditions to fast calculated the approximation of decomposition reaction rate of K-feldspar and acid in reactor piping,it can provide a reference for the parameters adjustment in industrial production process,greatly saving time costs,material costs,labor costs and so on in the process of experiments to explore.