Considerations Of Graphite Crucible When Used

Graphite crucible has good thermal conductivity and high temperature resistance,when used at high temperature,it has certain strain resistance to thermal shock and quench.it also has excellent chemical stability,so it has strong corrosion resistance to acid and alkaline solution.it's widely used in many industries.so it's necessary to list the considerations of graphite crucible when used.

1、When Moved it should be handled gently,do not break the surface coating,avoid rolling by all means.

2、Stored in a dry environment,must not be affected with damp.

3、When Used for coke oven,it should be used crucible holder,crucible holder diameter should be slightly bigger than the bottom graphite crucible diameter,fully support the bottom of graphite crucible.

4、Shall not be tilted when inside furnace,top of the graphite curcible is not higher the furnace.between the furnace and the crucible,should be used wall brick,the wall brick is higher the crucible.the cover of the furnace should be on the furnace wall.

5、the coke briquette should be smaller than the spacing of furnace wall and the crucible,which is automatic fall,shall not be ramming.

6、The heat temperature of Graphite crucible need to up to 200℃ for 1-1.5 hours when used at the first time.then one hour up to 800℃,the baking time should not be too long.(first baked,graphite crucible should be rolled constantly,The temperature of the crucible should be slowly up inside and outside,up and down of the crucible,and shall not exceed 100 ℃,when it Stays cool,continues to heat up after water vapor discharges)

7、Furnace lining must keep in good condition,so it can focus the flame.

8、Adopt heating burner,flame should not be direct injection on the crucible,but the crucible holder.

9、Use The same crucible tongs when raised and  loaded.

10、When raised,broken material first then the metal ingot.But not too close and placed horizontally.avoid crucible cracked due to the metal expansion.

11、Better to continuous melting when graphite crucible startd to use,reduce the interval of time.

12、If Stoped in the middle time,The residual liquid should be all clear,avoid crucible cracked when used the next time.

13、In the process of smelting,The dosage of refining agent must be strictly controlled,if too much,it will reduce the life of graphite crucible accordingly.besides,Junction of ballastless must be cleared,which affects graphite crucible and triggers the broken of the upper crucible at the same time.