According to the difficulty in removing silicic impurity for Cryptocrystalline, research of purification through alkali roasting binding with flotation was carried out. The amount of alkali and flotation contribute to the effect of purification remarkably. In this experiment, a effective way to get rid of the silicic impurity in graphite was found, which help us to get a graphite product with a high microcrystal carbon. The sample had been cleaned from washing process is the efficient fact, by which super pure graphite can be got. In this paper, conclusion was drew that the rudimental natrium ion from alkali leaching process can be deposited with the silicic and aluminous ion during the acid washing process to transform into cryolite substance.%针对微晶石墨中硅杂质难脱除的特点,进行了高温碱法结合浮选法除硅的研究.研究表明,浮选法和氢氧化钠的加入量对提纯效果影响显著.在合适工艺条件下,可得到固定碳含量较高的微晶石墨产品,焙烧后样品水洗干净与否直接影响样品的最终固定碳含量.高温碱处理后残留的钠离子与待处理的铝、硅杂质离子反应,生成不溶性物质,是导致硅杂质脱除效果不佳的主要原因.
展开▼
