Crucible for resistance furnace

Notes before using the product

1. Goods acceptance

When you receive the goods, you should check whether the outer packaging of the goods is intact. The crucible should be checked for any damage during transportation before use.

2. Handling

The crucible must be handled with special handling tools, and the crucible must not be rolled directly on the ground. Collisions should be avoided during handling to avoid damaging the glaze layer and thus affecting the service life of the crucible.

3. Storage

The crucible must be stored in a dry, well-ventilated place, preferably on a wooden bracket. Avoid placing the crucible directly on a brick, earth or concrete floor. Moisture in the crucible can cause damage to the glaze layer thus reducing the melting efficiency and service life of the crucible, and in severe cases even the bottom may fall off.

Product use specification

2) Installation of crucible for rotary furnace

The crucible should be fixed using support bricks on both sides of the crucible pouring nozzle to avoid wedging the crucible tightly. At the same time, a material such as cardboard of about 3-4 mm is padded between the support brick and the crucible as a pre-expansion space for the crucible.

3) Installation of the crucible for resistance furnace

The crucible should be placed in the central part of the resistance furnace, with the bottom of the crucible above the bottom row of heating elements. The crucible should also be sealed with insulation wool between the top of the crucible and the furnace rim.

4) Installation of the crucible for the induction furnace

Make sure that the crucible is placed in the central part of the induction coil to avoid local overheating and cracks in the crucible.

Graphite crucible charging

1）The metal material must be dried before adding.

2）The metal ingot should be gently put down when adding material, and should not be thrown or poured into the crucible to avoid damaging the crucible.

3) Place the metal ingot vertically in the crucible with sufficient expansion space between the metal ingot and the crucible wall. Do not place the metal ingot horizontally in the crucible, so that the expansion of the ingot after heating will not swell the crucible.

4) Some small pieces of metal material can be added in the crucible first as a bedding for the large ingot material.

5) When continuous melting, you can keep part of the metal solution inside the crucible to speed up the melting speed. However, avoid adding large pieces of metal material to a small amount of solution to avoid sudden cooling or solidification of the solution, which may damage the crucible.

6) When adding liquid metal, avoid overfilling, generally not more than 80% of the crucible capacity.

How to Achieve Optimal Performance

The crucible's optimal performance can be maintained and the crucible's service life can be effectively extended if the following points are followed during the use of the crucible.

1）The crucible should be selected for each molten metal for which it is designed.

2） When heating the crucible, pay attention to the following.

• Preheat the new crucible as specified to remove moisture from the crucible.
  
• Heat the crucible so that the outer surface of the crucible is evenly heated.
  
• Use the crucible lid to seal the crucible above to reduce heat loss and oxidation of the crucible. However, allow sufficient expansion space to avoid tight pressure on the upper edge of the crucible.
  
• When using gas or oil-fired crucible furnaces, use a lightly oxidized flame and avoid direct flame injection at the bottom of the crucible.
  
• When adding additives, immediately stir the metal solution and promptly remove the slag from the crucible. When adding flakes or lumps of additives a bellows should be used to immerse them.
  

3）During the pouring process, avoid bumping or knocking the crucible with tools such as crucible tongs and pouring ladle.

4）When cleaning the crucible, use the special tool that comes with the crucible while it is still hot.

5）When the crucible is temporarily out of use, the following matters should be noted：

• If a gas or oil furnace is used, turn off all fans so that cold air does not attack the crucible exterior and cause oxidation or even rupture.
  
• Allow the cyanoskeleton to cool itself to room temperature. Accelerating or retarding the self-cooling may increase oxidation or cause rupture of the crucible.
  
• For crucibles that are used infrequently, they should be stored in a fixed area and kept dry in the storage environment.
  

6）The crucible furnace should be checked frequently to ensure that the crucible furnace is in proper working condition. The slag on the lining of the crucible furnace should be cleaned in time.