Maybe you have
heard of Graphite
Crucible,which can be
made of graphite. That is for sure. But just how much do you know in regards to
the machining of graphite?
Let us talk in
regards to the graphite purification approach. To become distinct, graphite
purification,can be divided
into two methods which may be incorporated chemical purification and physical
purification.
Now, let’s say
anything about chemical purification, which belongs to Graphite Machining.
Generally speaking, chemical purification can use the nature of the graphite’s
acid resistance, alkali resistance and anti-corrosion. We are able to use acid
and alkali to complete remedy for graphite concentrated ore. Because of this,
we are able to make impurities dissolve. Right after that, we are able to wash
all of the impurities away. Within this way, we are able to increase
concentrate ore’s grade. By utilizing the technique of chemical purification,
we can get grade 99% of higher carbon graphite. Electric Discharge Machining
may also be employed.
However, there
are lots of methods for chemical purification, the technique which we most
extensively use can 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 really is beneath the situation of
high temperature that is more than 5 hundred degrees, the graphite’s impurities
(which mostly belong for the silicate minerals) can react with caustic soda
which is referred to as NaOH. Within this way, we are able to make them
generate water soluble reactants. Simultaneously, we can use water to leach
reaction components. As a result, we are able to eliminate a part of the
impurities. As for another a part of impurities, for example iron oxides, we
are able to use alkali fusion and HCl to finish neutralization. In this way, we
are able to make them to create ferric chloride that is soluble to water. If we
use water to wash such type of impurities, they can all be removed.
The equipments
making use of Alkali fusion might be mainly divided into anchored mixer,
melting furnace, spiral mixer, V variety washing tank and so on. By the way,
the recovery rate might be eighty 5 to ninety %. And we have to finish
investment with a single hundred and fifty thousand to two hundred thousand
yuan. As all of us know, although the process is far more sophisticated, but
you'll find also some disadvantages. For instance, we must consume a sizable
volume of water, the loss of graphite is a lot more, the productivity is low,
large volume of alkali consumption and emissions of waste pollution to the
environment.
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