Describe The Manufacturing Procedure Of High Alumina Cement

Calcium aluminate cements – also referred to as high alumina cement, aluminous cement or in French, cement fondu - consist of predominantly hydraulic calcium aluminates which can be used in numerous different specialized, small-scale applications.

The manufacturing process consists of fusing a mixture of calcium bearing material (calcium oxide from limestone), and bauxite (an aluminum bearing material for general purposes, or refined alumina for refractory and white cement). The outcome is actually a liquefied mixture that cools to your vesicular clinker which is ground to generate the ultimate product. As melting occurs during the process, the raw material in lump form can be used. A kiln arrangement comprising a reverberator furnace which can be given a shaft pre-heater allows hot exhaust gas to successfully pass upward even though the raw lump material passes downward. Most of the heat from your combustion gases is recuperated through the pre-heater, dehydrating and de-hydroxylating the bauxite, and de-carbonating the limestone. This calcined material drops down into the cool end of the melt bath which overflows in to the hot end of any furnace into steel molds, where it cools and solidifies. The program is fired by oil or pulverized coal and also the clinker ingots are then ground and crushed in to a dark gray powder employing a ball mill.

One of the outstanding attributes of high alumina cement is definitely the extremely high rate of strength development – about 80% from the ultimate strength being achieved after 24 hours. Unfortunately, high alumina cement within its converted form is vunerable to chemical attack, both from alkalis and sulphates. In order to assess the fitness of HAC concrete, it is usually necessary to look for the amount of conversion. When the concrete shows signs and symptoms of any deterioration, it could be necessary to cary out other chemical tests.

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