Perlite Ore are added to molten metal pouring ladles. Perlite Ore will expand when it comes to contact with molten metal, forming a light weight, viscous cellular accumulation. This accumulation of perlite attracts all slag particles in the metal, cleans the metal by coagulating impurities, floating them up to the slag layer and also re-entry of impurities in the metal.
HOT TOPPING AND RISERING
When Perlite mixed with exothermic powders, it can prevent shrinkage cavities in ingots and casting. Perlite is commonly used as lightweight filler because of its availability, low cost and admirable properties.
Perlite Ore is used in the manufacture of refractories where the average temperature does not exceed approximately 1100⁰C (2012⁰F). If it exceeds this temperature, perlite is used as a back-up insulating layer.
FOUNDRY CORE AND MOLDING SAND
Perlite Ore is used for foundry core and molding sand as a cushioning agent to compensate for the expansion crystalline silica. It minimizes casting defects, and cleaning room costs are reduced.
TECHNICAL INFORMATION OF PERLITE USAGE IN FOUNDRY INDUSTRY
• It ensures a clean metal surface free from slag by coagulating the impurities.
• It forms an efficient insulating layer on the top of ladle which significantly reduces the radiant loss of heat that may be maintained until pouring time and hence therefore acts as an insulating barrier.
• It also reduces Sulphur content and prevents re-entry into the bath when added to
ladle by holding them in the slag.
• It does not produce objectionable smoke or noxious fumes, hence non-polluting.This is your new text content. You can modify this text, add more paragraph, change font style or add images by clicking the edit button.
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