Influencing factors on electroconductivity of ultra-pure anthracite
In order to study the electroconductivity of anthracite and improve its conductivity,and make anthracite become a part of filler and electrode materials,ultra-pure anthracite with ash content of 0.13％ was prepared by acid solution method.The effects of moisture,ash content,pressure,particle size and mineral composition on the electroconductivity of ultra-pure anthracite were investigated by powder resistivity tester.The results show that the electrical conductivity of anthracite increases with the increase of moisture and pressure.The electrical conductivity increases gradually with the decrease of ash content.The electrical conductivity increases sharply with the ash content decreasing when the ash content is less than 1.0％.When the pressure is 4.00 MPa,the moisture is 6.21％,the particle size is 0.2-0.1 mm,and the ash content is reduced to 0.13％,the electrical conductivity of anthracite is the best,and its electrical conductivity is 1.44×10-7 S/cm.In the study range,the influence of particle size on the conductivity of anthracite is small.The order of electrical conduc-tivity of common minerals in coal is:pyrite>kaolinite>silica>calcium carbonate>calcium sulfate,pyrite has the highest conductivity value,which reaches 1.32×10-2 S/cm.The electrical conductivity of anthracite increases with the increase of pyrite content,but decreases with the increase of other mineral content.The response surface model is used to optimize the orthogonal experimental results,and the quadratic regression equation between the electrical conductivity of anthracite and moisture,ash content and particle size is obtained.The influence of moisture and ash content on the conductivity testing results of anthracite is significant,in which ash has the greatest influence on conductivity,followed by moisture and particle size.
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