草酸钴密闭裂解制取钴粉工艺技术研究

【作者】 陈宏；

【导师】 游贤贵； 邓建修；

【作者基本信息】 四川大学 ， 2002， 硕士

【摘要】 金属钴粉作为硬质合金的粘结金属，是硬质合金生产中不可取代的主要原料。钴粉的生产长期以来采用氧化钴氢还原法，即，金属钴→CoC2O4→CoO(+H2) →钴粉。此工艺存在着粉尘及有害气体对环境的污染和对操作者健康的危害。针对氢还原法存在的问题，在理论分析的基础上，拟采用草酸钴密闭热裂解的新工艺路线。通过小型试验，研究了裂解温度，反应时间及物料装填方式对钴粉粒度及氧含量的影响，了解到随裂解温度的升高，反应时间的延长，钴粉的氧含量降低，而粒度增加。确定最适宜的升温方式为三段式升温(200℃-450℃-550℃～600℃)，最好的装填方式为浅层装料。在小试研究的基础上，用自己设计制造的120KW的两段式电加热炉进行了50公斤／台规模的生产性试验。试验结果表明，用密闭热裂解草酸钴制备钴粉与传统的氢还原工艺相比，能制得质量更好，成本更低，粒度更细(2． 5um左右)的球形钴粉。新方法不仅生产工艺短，操作方便，而且从根本上消除了有害气体和粉尘对环境的污染。更多还原

【Abstract】 Cobalt powder, as the bonding agent, is the incomparable main raw materialduring the manfacturing of cemented carbides. Cobalt oxides reduction byhydrogen is the method traditionally used to prepare Co powdef, i.e., metal cobalt→CoC2O4 → CoO (+H2)→ cobait powder. But dust and poisonous gas will result inpollution to the environment and harm to the health of the operators. Owing to this,enclosed thermal decomposition of CoC2O4 is investigated in this study Theinfluence of temperature of decomposition, time duraton of reation and way offilling on the pedicle size and oxygen content of cobalt powder are investigated in asmall-scale experiment. It is concinded that the oxygen contot of resultare cobaltpowder lowers with the increase of decomposition temperatllre and reaction time butthe particle size increases. Three-stage heating method(200℃-450℃-550-600℃)is the most appropriate way of heating and shallow filling is the best way of fillingmaterial. Based on this exPerimellt, a 50kg producton test is conducted by using the120kw two-stage heatng oven made by the author himself It is showed thatcompared to the traditional hydrogen reducton method, the method of enclosedthermal decomposition of CoC2O4 is capable to produce sphercal Co powder ofbetter quality and finer particle size (around 2.5pm) with lower cost. This process isnot only short but also easy to operate and free of dust and poisonous gas pollutionto the enVronmfit.更多还原