PROCESS MINERALOGY STUDY ON K-FELDSPAR ORE IN WUDU,EBIAN COUNTY,SICHUAN PROVINCE

In order to provide a scientific basis for mineral processing and comprehensive utilization of resources of K-feldspar in Wudu area of Ebian County,Sichuan,X-ray fluorescence spectrometer(XRF) and X-ray powder diffractometer(XRD) and other measurement and analysis technique were used to study the composition,structure,granularity and occurrence of disadvantage composition of the ore.It is showed that the chemical composition of first-grade raw ore is SiO2 68.31,Al2O3 14.70,Fe2O3 1.19,TiO2 0.30,CaO 0.69,MgO 0.21,K2O 7.40 and Na2O 2.97.The mineral composition w(B)/% of the ore is composed of K-feldspar(43.79),albite(25.17),quartz(22.66) and clay minerals(8.38).Therefore,the chemical composition of the first-grade raw ore meets the standard of the glass industry except Fe2O3,and it can meet the standard by water-washing and magnetic separation process.Compared with the first-grade raw ore,the content w(B)/% of K-feldspar(29.35) and albite(22.88) in the second-grade raw ore is lower,while the content of quartz(37.57) and clay minerals(10.20) is higher.The process of water-washing and acid-leaching can obviously reduce the content of Fe2O3,but lead to the decrease of useful components and therefore,unable to meet the standard of chemical composition.The occurrence of disadvantage composition Fe2O3 is duo to some iron-rich minerals,such as biotite,hematite,chlorite and hornblende in the ore,and is related to clay minerals with high content iron.