Possibly you
have heard of Graphite Crucible,which is produced of graphite. That is for
confident. But how much do you know concerning the machining of graphite?
Let us speak in
regards to the graphite purification technique. To be certain, graphite
purification,can be divided
into two methods which can be integrated chemical purification and physical
purification.
Now, let’s say
one thing about chemical purification, which belongs to Graphite
Machining. Typically speaking, chemical purification can use
the nature of the graphite’s acid resistance, alkali resistance and
anti-corrosion. We can use acid and alkali to do treatment for graphite concentrated
ore. Because of this, we can make impurities dissolve. Right after that, we can
wash all the impurities away. In this way, we are able to increase concentrate
ore’s grade. By using the method of chemical purification, we can get grade 99%
of higher carbon graphite. Electric Discharge Machining may also be used.
Nevertheless,
there are lots of techniques for chemical purification, the approach which we
most extensively use could be sodium hydroxide high-temperature melting
strategy. Graphite
Producer can give us a lot more information.
As for the basic
principle of chemical purification, when it is under the condition of high
temperature which is more than 5 hundred degrees, the graphite’s impurities
(which mainly belong to the silicate minerals) can react with caustic soda
which is called NaOH. In this way, we can make them generate water soluble
reactants. Simultaneously, we are able to use water to leach reaction
materials. As a result, we are able to remove a part of the impurities. As for
another a part of impurities, including iron oxides, we can use alkali fusion
and HCl to finish neutralization. Within this way, we are able to make them to
produce ferric chloride which can be soluble to water. If we use water to wash
such kind of impurities, they are able to all be removed.
The equipments
utilizing Alkali fusion may be primarily divided into anchored mixer, melting
furnace, spiral mixer, V sort washing tank and so on. By the way, the recovery
rate can be eighty 5 to ninety percent. And we must finish investment with a
single hundred and fifty thousand to two hundred thousand yuan. As all of us
know, though the process is far more advanced, but you will find also some
disadvantages. As an example, we need to consume a large volume of water, the
loss of graphite is significantly more, the productivity is low, large volume
of alkali consumption and emissions of waste pollution to the environment.
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