Other Products / Services #3720827

Kyanite is an important refractory mineral for the manufacture of high alumina refractories. Though similar in composition to silliminite, kynaite differs from the physical properties in that, on conversion to mullite by heating, kyanite undergoes volumetric expansion of 16% necessitating its calcinations prior to utilization.

Consequently, both chemical and thermo-mechanical conditions are very severe here. The primary criteria for Refractories to be used in these zones are that they should have higher tendency to form a stable coating of clinker which enhance the life of the refractory by protecting it against the mechanical abrasion and chemical action of the clinker. The usage of high alumina Refractories in this zone is diminishing with the advent of large diameter rotary kilns with pre-heaters and pre-calcinators due to increased thermal as well as mechanical load.

The rotary calciner condition (11500C 16500C), lining design (monolithic/refractory shapes) and refractory applications vary depending on the product type and kilns. To meet the critical operational conditions and to the at par with the best achieved performance and refectory consumption (1.25kg/t) overseas, specific qualities of Refractories are desired.

The major problems faced with indigenous Refractories used in alumina calciners are high shall temperature and low abrasion resistance. Low cement/Ultra low cement constable (80 90% Al2O3) and refractory shapes of tailored properties are essential for overcoming these operational problems and achieving improved performance.

This furnace is a large structure, mostly built underground, on a floating foundation. It consists of several pits or cells. Several type of fireclay and insulation Refractories are used in these furnaces.

High grog super duty bricks are mostly used in the flue duct. In back up walls and head walls, high duty and medium duty bricks depending on service conditions are being used. The furnace temperature varies from 13000C to 15000C.

Burning zone and transition zone are the most critical zones of the cement rotary kiln where actual firing of the charge and clinker formation takes place.

Consequently, both chemical and thermo-mechanical conditions are very severe here. The primary criteria for Refractories to be used in these zones are that they should have higher tendency to form a stable coating of clinker which enhance the life of the refractory by protecting it against the mechanical abrasion and chemical action of the clinker. The usage of high alumina Refractories in this zone is diminishing with the advent of large diameter rotary kilns with pre-heaters and pre-calcinators due to increased thermal as well as mechanical load.

This eventually calls for the thermally efficient refractory lining in the rotary kiln. Keeping pace with the improved cement manufacturing technology has been increasingly specialized to offer the opimum possible solution to the cement manufacturers for increasing the life of Refractories lining. Further environmental considerations and disposal regulations in many countries have made the limitation in selection of Refractories for lining the rotary kilns. Super duty basic bricks of direct bonded mag-chrome and mag alumina quality are gradually substituting the presently used high alumina bricks.

Advantages ::

Glass Slumping / Kiln formed glass.

When people are heating glass to a point where, at the right temperature gravity causes the glass to take a new shape. Forming glass in this way requires a mould to get the glass to form into or to allow the glass to slump to create a smooth concave or convex surface. Glass formed in this way can be used for plates, bowls, windows, furniture, panels and many decorative and artistic items. We are supplying a full range of products.

Our products include:

Ceramic fibre blanket, board, papers, rope and braids	Ceramic fittings
Vermiculite products, board and loose	Calcined alumina
Insulating fire bricks	Coating materials
Element wire	Kiln materials and repairs

Glass Blowing.

Glass is contained in either a crucible or tank furnace and is heated to a molten state for use to make formed objects. Glass made this way requires a furnace for holding and melting the glass, a glory hole for keeping the glass hot and workable and an annealing furnace for tempering the glass. Blown glass can be used for items from bowls and plates, sculptures, artwork to specialised equipment. We can supply material for your tank furnace, glory hole and annealing furnace.

Our products include:

High temperature castables to 1800 C	Fused cast (AZS Alumina Zircon Silica) items
High alumina fire bricks and mortar	Ceramic fibre products
Insulating fire bricks	Furnace materials and repairs

Application ::

In various regions of furnace based on Continuous Casting

Solubility resistance to hot metalPenetration prevention of molten substances such as hot metal, etc.Superior thermal stress resistanceHigh thermal conductivity Good spalling resistance. Keeping the above in view, new carbon blocks have been developed for improved characteristics such as: Prevention of matrix solution by adding alumina and by adding siliconImprovement of pore size distribution by improved forming methodImprovement of deformability and thermal conductivity by using a lot of natural graphite.