Graphite purification methods
Jiaozhou graphite mouldSmall make up to tell youGraphite purification methods
(1) chemical purification using graphite properties of acid, alkali, corrosion resistant, with acid, alkali graphite concentrate processing, to dissolve impurities, and then wash off, improve the concentrate grade. Chemical purification grade of 99% high carbon graphite. There are many chemical purification method, domestic application is one of the most widely sodium hydroxide high temperature melting method.
Fundamental is under the condition of high temperature above 500 ℃, make the impurity in the graphite (mainly silicate minerals) and caustic soda, which react NaOH, produce water soluble reactants, water leaching reagents, can eliminate some impurities, another part of impurities, such as iron oxide, with HCl neutralization after alkaline fusion, generate sub water soluble ferric chloride, washing with water can be removed.
(2) the physical purification namely high temperature purification, according to the property of graphite, high temperature resistant, put in electric furnace, its isolation air heated to 2500 ℃, the ash content (impurities) evaporate, thus improve the concentrate grade. High temperature purification grade of 99.9% high purity graphite.
