Showing posts with label Ramming Mass. Show all posts
Showing posts with label Ramming Mass. Show all posts

November 30, 2008

Installation Procedure of Refractory Ramming Mass and Heating Schedule for Induction Furnace

Here is a step-by-step procedure for installation of Refractory Ramming Masses for Induction Furnace as given below:

1. Scrub all loose materials and clean the furnace.

2. Before using heat the refractory material (Ramming mass) at about 100OC to make it free from moisture. Spread the material at the furnace bottom to about 50 - 60 mm thick layer at each time. Then ram the layer uniformly using a suitable rammer. The material has to be rammed layer by layer to get maximum compaction. Before ramming, little bit poking with a rod help to drive away the air-pockets trapped within the loose refractory material spread.

3. Place the steel former on the rammed bottom. Then fix the steel iron block at the center of the steel former to get uniform thickness throughout the furnace wall.

4. For ramming the upper portion of the side-wall just above the induction coil, mix the dry refractory material with 1-1.5% Sodium Silicate solution and 3-4% water.

5. Best results can be achieved by following the heating-schedule for the furnace as mentioned hereunder -

Furnace Heating Schedule


Furnace Temperature

Rate of Heating with Holding Time

Ambient temp to 100OC

@ 30OC / hr.

Hold at 100OC.

4-6 hr depending upon the lining thickness.

100O - 800OC.

@ 50OC / hr.

Hold at 800OC.

2 - 3 hr.

800O - 1400OC.

@ 100OC / hr.

Hold at 1400OC.

4 - 6 hr.

1400OC to furnace operating temperature.

@ 100OC / hr.