Scholarly record

THE TREATMENT OF CUPOLA FURNACE FLY DUST

Peter Futáš

Abstract

Castings production from gray cast iron is 55% of castings production around the world. Cupola furnace is the most used melting furn ace for the cast iron production. There is a counter current heat excha nge during melting process in the cupola furnace. Gases proceed upwards and charge and coke downw ards where they are heated. During this process the emission creation. These emissions come from coke and metallic parts of the charge. Another sources of contamination are particles created by abrasion of charge on the refractory material and also sign ificant part of these emissions is an coke ash. These particles are draged by cupola furnace gases and they are adrifted outside. According to the high demands of clean e nvironment the furnaces are equipped with baghouses. Solid particulates are mostly co llected on sleeve filter. Nowadays foundries export these wastes (fly dust) collected on filters to the dump and they do not try to recycle them. The fly dust from cupola furnace contains also metallic fractions, mainly in form of FeO . This particulates can be recycled in two ways: by direct blowing to the cupola furnace or by adding it to the charge. In the second case it is necessary to compact fly dust by pelletizing or briquetting. The aim of this article was to find the suitable way of compacting method the fly dust, with a goal to use the fly dust as the charge into cupola furnace.

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