Special notes for graphite crucibles:
1. Be careful not to give mechanical impact, do not drop or hit
from high places.
2. Do not get wet with water. Store in a dry place.
3. Do not allow graphite cruciblescontact with water after it
is melted and dried.
4. Do not aim the flame directly at the crucible (spray to the
bottom of the crucible) during use. If there is a noticeable
black mark at the bottom of the crucible when it is sprayed.
5. After furnace shutdown, the remaining aluminum and copper
materials should be taken out as far as possible, and no
residual liquid should be left in the chamber.
6. The use of acid (slag remover, etc.) should be used in an
appropriate amount, and excessive use will erode the crucible
and cause cracking.
7. Not impact the crucible and not use mechanical force
when feed raw materials into it.
Save and carry:
1. The graphite crucible is afraid of water, absolutely must
avoid the dampness and the water to drench.
2. Pay attention to surface bruises. Do not place the
cruciblesl directly on the floor and place it on the pallet.
3. Do not roll horizontally on the floor. When you push it on
the floor, you need to pad the soft cardboard or rag on the
floor to avoid bruising the bottom.
4. Pay special attention when handling, do not drop or hit.
Installation:
1. The base of the base must be the same or larger than the
crucible's base diameter of the base, and height of crucible
table should be higher than that of nozzle to prevent
tthe fire be sprayed into the crucible.
2. The refractory block should be made of round refractory
bricks. It needs to be flat and not bent. Do not use half or
uneven bricks. It is better to use imported graphite crucible
table.
3. The graphite crucible table must be placed at the center of
melting, with coke powder, straw ash, or fire-resistant cotton
as the mat to avoid sticking the crucible to the crucible
table. After the crucible is placed in the middle of the melt,
make sure it is horizontal (preferably in horizontal measure).
4. The size of the crucible should be matched with the size of
the furnace body. The distance between the crucible and the
fusion wall should be appropriate, and it should be at least
*0mm.
5. When the nozzle crucible is installed, the contact gap
between the bottom of the crucible nozzle and the refractory
brick should be reserved about the gap of ****0MM, and nothing
can be cushioned under the bottom. The nozzle and furnace wall
should be leveled with refractory cotton.
The furnace wall should have fixed refractory brick (three
points) and crucible shall be cushioned with corrugated board
about 3mm thick as the hot expansion space after heating.
Preheating drying treatment:
1. Preheat the crucible on the oil stove within **5 hours
before use, which is helpful for dehumidifying the surface.
2. Place charcoal or wood in the crucible for about 4 hours
before using the new crucible, which helps to dehumidify the
crucible.
3. The preheating time in the new crucible furnace is as
follows:
oil furnace
0 ℃ ***0 ℃ slow heating 1H
**0 ℃ ***0 ℃ slow heating 4H
electric furnace
0 ℃ ***0 ℃ slow heating up 4H
**0 ℃ ***0 ℃ slow heating 4H
**0 ℃ ***0 ℃ slow heating 4H
**0 °C - **0 °C fast heating to maintain 2H
From **0 ℃ to **0 ℃, the temperature increases rapidly
and keeps 2H
4. After stopping the furnace, the preheating time of the
furnace is as follows: Oil furnaces and electric
furnaces: 0 ℃ ***0 ℃ slow heating 1H**0 ℃ ***0 ℃ slow
heating 4H**0 ℃-rapid heating up to the required
degree
a. Electric furnace: the best way to stop work is to keep the
temperature around **0 ℃; if not, the soup should be
scooped out as far as possible, not to stay in the crucible
too much; if power failure, the material should be taken out
quickly.
b. Oil furnace: After the furnace is stopped, the soup should
be kept as clean as possible. The cover of the furnace and
the vents of the furnace should be covered well, and the
remaining temperature of the furnace should be kept away from
moisture.
5. Feeding: When the first furnace is used, first add the
scrap (small material) and then add the block material, and
then use pliers to tighten and gently put it into the
crucible. You can't add too much at one time to avoid
crushing the crucible.
A. Oil furnace: **0 °C can be added later;
B. electric furnace:
a. **0 °C - **0 °C began to add small materials, **0 °C after
the slowly adding block material, such as the production of
continuous feeding do not add to a fixed position, so as not
to Causes oral oxidation.
b. Dedicated to heat preservation electric furnace. Before
stopping the furnace, it must be preheated to **0°C to pour
aluminum soup.
Precautions in use:
To be gently, not vigorously and placed in a crucible to
avoid crashed through the crucible when feeding.
2. The **-hour non-stop service life will be longer. When the
furnace is shut down, the melting soup in the bowl must be
cleared to prevent the molten soup from solidifying and then
reheating. When the heat is applied, it will expand,
affecting the life of the bowl or even breaking the bowl.
3. Melting Aids: The use of additives (FLLUX) for the melting
of aluminum alloys and borax for copper alloys requires a
small amount for avoid erosion of the crucible walls.
Auxiliaries need to be dissolved in a minimum of 8 minutes
when the aluminum metal is dissolved into the soup. Lightly
mix in the medium and stir it to avoid adhesion to the inner
wall of the crucible.
*Aluminum alloy auxiliaries containing more than *0% NA are
required for special materials.
4. After the daily work is completed, when it is still red,
please remove the metal material attached to the wall and
clean it to prevent the residue from affecting the heat
transfer and increasing the dissolution time, resulting in
thermal expansion and bursting.
5. It is recommended to use the crucible smelting aluminum
alloy for about two months (melting copper alloy weekly) to
check whether the surface is abnormal or not, and the furnace
can be cleaned and the crucible turned in the same time. This
operation is helpful for prolonging the service life of the
crucible.
