What are the different types of refractory materials?
Types of refractories 3 types- 1)Acid refractories (e.g silica bricks) 2)Basic refractories (e.g magnetia bricks) 3)Nutral refractories (e.g karborundum bricks) 15.
What are the steps in the refractory process?
Firing involves heating the refractory material to high temperatures in a periodic (batch) or continuous tunnel kiln to form the ceramic bond that gives the product its refractory properties. The final processing stage involves milling, grinding, and sandblasting of the finished product.
Why is the apparent porosity of a refractory important?
Porosity:The apparent porosity is the volume of the open pores, into which a liquid can penetrate, as a percentage of the total volume of the refractory. This property is important when the refractory is in contact with molten charge and slag. A low apparent porosity prevents molten material from penetrating into the refractory.
Which is an indicator of the strength of a refractory?
Cold crushing strength:The cold crushing strength is the resistance of the refractory to crushing, which mostly happens during transport. It only has an indirect relevance to refractory performance, and is used as one of the indicators of abrasion resistance. Other indicators used are bulk density and porosity.
The typical refractory materials include fireclay refractories, high alumina refractories, silica brick, Magnesite refractories, Chromite refractories, Zirconia refractories, Insulating materials and Monolithic refractory.
How are monolithic refractories used in industrial furnaces?
Monolithic refractories are replacing the conventional type fired refractories at a much faster rate in many applications including those of industrial furnaces. Insulating materials are high porosity refractories with low thermal conductivity used in order to reduce the heat losses.
What are the applications of high alumina refractories?
The refractoriness of high alumina refractories increases with increase in alumina percentage. The applications of high alumina refractories includes the hearth and shaft of blast furnaces, lime and ceramic kilns, cement kilns, glass tanks and crucibles for melting a wide range of metals.
Why is the unshaped refractory technology so important?
As the unshaped refractory, especially the castable, is becoming of prime importance in refractory research, a good amount of work is going on globally to study the effect of nanotechnology on castables. The Effect of different nano-oxide binders, formed from colloidal bonding agents and nano-additives is also important.