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.