采用磁化焙烧工艺,以自制碱法活性竹炭为磁化焙烧还原剂,研究了添加剂、焙烧温度、保温时间对高岭土中含铁矿物质量磁化率的影响,最终确定磁化焙烧工艺的最佳方案：2．0％硼酸和3．0％ NaHCO3,磁化焙烧温度450℃,保温时间30 min,高岭土中含铁矿物的质量磁化率达5．58×10－4 m3/kg.经磁化焙烧工艺对处理后的高岭土进行湿法球磨,当浆料体系在pH 值为9,球磨时间为30 min时,磁选精矿磁选产率可达84．4％,此时磁选高岭土精矿的煅烧白度(温度1200℃)为87．4％,比未处理高岭土煅烧白度64．8％提高幅度22．6％,比传统化学漂白高岭土的煅烧白度73．2％提高幅度14．2％.
The experiment used magnetic roasting process,took bamboo charcoal powder that was dealt with base activator as magnetic roasting reducing agent.It studied that additive,sintering temperature,and holding time had some effects on mass susceptibility of iron mineral in kaolin.Determined finally the best solution of magnetic roasting process was that it was added 2.0% boric acid and 3.0% NaHCO3 ,its magnetic roasting tem-perature was about 450 ℃,its holding time was 30 min,and mass susceptibility of iron mineral in kaolin reached 5.58×10-4 m3/kg.To kaolin after treatment of magnetic roasting process,it was necessary to deal with it by wet milling.When the pH value in the slurry system was about 9 and milling time was about 30 min.The production rate of magnetic separation was up to 84.4%.And this time the calcined whiteness of magnetic kaolin concentrate (Temperature was 1 200 ℃)was 87.4%.It increased by 22.6% than calcined whiteness 71.3% of untreated kaolin sample,it increased by 14.2% than calcined whiteness 76.5% of original kaolin sample.
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