Title

FAILURE ANALYSIS OF ROTARY KILN’S TERTIARY AIR DUCTS

Authorship

THOMAZI, CLEBER CAETANO; BRANT, YURI CASTILHO CALDEIRA; NETO, OSVALDO DA SILVA; BAILONA, BALTAZAR AGENOR; ITO, HAMILTON LELIS

THOMAZI, CLEBER CAETANO

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BRANT, YURI CASTILHO CALDEIRA

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NETO, OSVALDO DA SILVA

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BAILONA, BALTAZAR AGENOR

I am this author

ITO, HAMILTON LELIS

I am this author

DOI

10.5151/1516-392X-30663

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Abstract

Rotary kilns are continuous process equipment used on calcining of nickel ore. The chemical and physical reactions are created by means of heat up the material to predetermined temperatures. Tertiary air fans are attached to the kiln shell to maintain oxidizing/reduction conditions. Special ducts orientate the air flow inside the kiln. In the present work, two types of failure on distinct tertiary ducts mounted on the same kiln are reported. Chemical analysis, hardness test, metallographic and fractographic examinations were carried out. Fabrication related problems and creep were identified as the root causes of damages.

Keywords

Kiln, Tertiary air ducts, Casting defects, Creep.

Creep.