电热法制备碳化硼的原料预成型工艺探究  

RESEARCH ON RAW MATERIAL PREFORMING TECHNOLOGY OF BORON CARBIDE PREPARED BY ELECTROTHERMAL METHOD

作　　者：李欣[1] 陈滨 牛群 乔佳 程恩庆 付晓莉 邢鹏飞 LI Xin;CHEN Bin;NIU Qun;QIAO Jia;CHENG Enqing;FU Xiaoli;XING Pengfei(Institute of Green Materials and Metallurgy,Jiangsu University,Zhenjiang 212013,China;National New Raw Material Base Construction Engineering Center of Liaoning Province,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]江苏大学绿色材料与冶金研究院,江苏镇江212013 [2]辽宁省国家新型原材料基地建设工程中心,辽宁沈阳110819 [3]东北大学冶金学院,辽宁沈阳110819

出　　处：《铁合金》2022年第4期21-25,共5页Ferro-alloys

基　　金：江苏省自然科学青年基金项目(编号:BK20200898);江苏省教育厅项目(编号:20KJB430022);企业合作课题(高纯超细硼化钛陶瓷粉体制备的新工艺研究,编号:20210898);企业合作课题(无碳铝电解可润湿阴极用硼化钛基复相陶瓷开发与产业化技术攻关,编号:20210786);企业合作课题(铝电解无碳阳极制备工艺研发,项目编号:20210643)。

摘　　要：为改善传统电热法制备碳化硼因采用粉体原料而导致的原料配比失调、产品纯度低和粉尘污染重等弊端,文章以硼酸和石油焦粉为原料,研究并优化了碳化硼制备过程中的原料预成型工艺(压制球团)。探究了制团压力、保压时间、配水量和黏结剂含量对球团物理性能的作用规律,以确定较优的预成型条件参数,同时对比分析了原料预成型工艺对硼酸原料挥发性的影响。研究表明,以羟丙基甲基纤维素为黏结剂,较优的预成型条件参数为:制团压力30 MPa、保压时间45 s、配水量6%,黏结剂含量3%。原料预成型可有效降低硼酸的挥发量,有利于维持原料配比平衡,进而促进碳热还原反应的进行。Aim to improve the disadvantages of the traditional electrothermal method of preparing boron carbide,such as the proportioning ratio imbalance,low purity of products and heavy dust pollution caused by the use of powder mate-rials,the paper studied and optimized the raw material preforming process(pressing pellets)in the preparation process of boron carbide with boric acid and petroleum coke fines as raw materials.The action mechanism of pelletiza-tion pressure,pressure-holding time,moisture content and binder content on the physical properties of pellets were in-vestigated to determine the better preforming condition parameters,and meanwhile the effects of preforming process on the volatilization of boric acid were also compared and analyzed.The results show that the optimal preforming condi-tions for hydroxypropyl methyl cellulose as binder are as follows:30 MPa pressure,45 s pressure-holding time,6%moisture content and 3%binder content.The preforming of raw material can effectively reduce the volatilization of boric acid,which is beneficial to maintain the balance of raw material ratio and promote the carbonthermic reduction reaction.

关 键 词：碳化硼 电热法 预成型 气孔率 抗压强度 

分 类 号：TF654.4[冶金工程—钢铁冶金]