硫铁矿烧渣制备导电陶瓷的工艺研究

采用全铁含量21.89;,Fe2O3含量29.80;的硫铁矿烧渣,在高温还原气氛下以少量还原剂还原,制备了电阻率较低的高强导电陶瓷.研究了烧结温度、保温时间、矿化剂种类及掺杂量对导电陶瓷强度及电阻率的影响.结果表明:导电陶瓷的强度随烧结温度的升高而增加,保温时间的延长而降低,矿化剂掺杂量的增加而增加；而电阻率的变化趋势正好与强度变化相反.当还原剂与硫铁矿烧渣比值为0.1,1400℃保温60 min,萤石掺杂量5.4;,导电陶瓷电阻率达到58 Ω·cm,强度87 MPa；而当Na2O掺杂量达到4;,电阻率为88 Ω·cm,强度为84MPa.

Study on Preparation Technology of Conductivity Ceramic with Pyrite Cinder

The high-strength conductivity ceramic with low resistivity was prepared using small amount of reductant and pyrite cinder with 21.89% total Fe,and 29.80% Fe2O3 in reducing atmosphere at high temperature.The effect of sintering temperature,holding time,type and quantity of mineralizer on the strength and resistivity of electric ceramic was investigated.The results indicated that the strength of conductivity ceramic increased as sintering temperature increasing,holding time and addion of mineralization agent decreasing.However,the trend of resistivity was contrary to change of strength.Conductivity ceramic products with resistivity of 58 Ω·cm and compressive strength of 87 MPa was obtained in laboratory scale when ratio of the reducing agent and pyrite cinder was 0.1 at 1400 ℃ for 60 min under 5.4% dosage of fluorspar,moreover,the resistivity and strength attained to 88 Ω·cm and 84 MPa respectively when the Na2O doping content was 4%.