Research On The Raw Materials Of Zisha In Yixing

Zisha pottery,or Zisha,is a kind of ceramic product with traditional Chinese characteristics,especially the Zisha pottery in Yixing.The utility,function,ornamental,artistic and collection of the purple sand collection are deeply loved by people.In recent years,with the continuous development of tea culture,the continuous expansion of the use of purple sand and the continuous improvement of the purple sand collection,the purple sand products,especially the Zisha pottery,are becoming more and more popular in the world.The Zisha in Yixing,the emergence and development of root cause is a condition of mineral resources,in places such as Zisha production of a special Huang Longshan,is rich in process performance is very excellent purple clay mineral raw materials.But as the long-term large-scale mining mineral resources and Yixing Zisha product demand is growing,especially the local government banned limit,purple clay mineral raw material supply is facing huge challenges,for the chaos of the name on the market also let Yixing Zisha didn't get more make full use of the material.This paper uses the many kinds of modern testing analysis?XRD,XRF and SEM,thin section analysis,thermal analysis,etc.?,comparative study the Zisha mineral raw materials in Yixing characteristics of different varieties of mineral raw materials,and the purple sand pottery and porcelain process test,through a large number of experiments and the analysis of test data,the following research results and progress has been made:?1?the Yixing clay mineral raw material,chlorite,red mud and clay with SiO₂,Al₂O₃,Fe₂O₃,K₂O is given priority to,mineral composition in quartz,kaolinite,illite main minerals,including iron ore material purple clay and clay as hematite,red mud as goethite and chlorite as pyrite.Quartz content is 30%³5%?25 to 100 microns?size,kaolinite content is 35%³5%,illite content is 23%²3%,including iron ore content of 4%⁶%,quartz,kaolinite and illite+iron oxide mineral combination is an important feature of yixing purple clay mineral raw materials..?2?the plasticity of yixing zisha mineral raw materials is of medium plasticity,which can give a good forming condition of purple sand.In sintering temperature in1000?¹200?range,each product is the best sintering temperature is slightly different,and the best sintering temperature range of the red mud narrow,about1100?.The loss of red mud>green mud,green mud>mix mud,and mix mud>purple mud,the shrinkage rate increased with the increase of temperature,red mud>green mud,green mud>mix mud,and mix mud>purple mud;The water absorption rate decreases with the increase of temperature,and the water absorption rate is about the same,about 4.5%.The color of each variety of clay becomes darker as the temperature rises.Under the optimum sintering temperature,sintering of purple sand body in short columnar 200 nm to 500 nm of mullite,can gift the strength of the yixing purple sand well,body see more 1³ um open pore and porosity closed,can gift yixing purple sand good permeability.?3?Yixing clay mineral raw materials,mainly illite,showing kaolinite mineral composition detection,but under the scanning electron microscopy?sem?and transmission electron microscopy?sem?did not find its typical characteristics,speculation is illite and kaolinite mixed layer mineral,needs further research.?4?based on the characteristics of the chemical composition of yixing purple clay mineral raw materials,can be divided according to how much Fe content of yixing purple clay mineral raw material varieties,namely the yixing purple purple purple clay Fe₂O₃ about 6%,yixing purple sand chlorite Fe2O3<4%,yixing purple red mud Fe2O3>8%,yixing purple sand clay Fe2O3 about 5%.?5?the yixing purple clay mineral materials are mainly mud,frigidite,emperor,tender can improve the plasticity of the sludge,mud stone redstone yellow is mainly used for coloring,purple sand pottery for rich purple sand pottery handicraft improve more creative inspiration.