Different methods for recycling aluminum slag have been used and the best method for turning it into refractory material is presented. The results show that the best method for recycling aluminum slag includes; grinding, sorting and sieving, leaching and calcination of aluminum slag at temperature higher than 1250 ºC. By use of a suitable method, low melting point phases such as aluminum in slag composition are decreased or deleted. Efficiency of this procedure is approved by chemical and phase analyzes. Such a procedure for recycling aluminum slag is enables protection of environment together with using slag as refractory material for lightweight castables. Also, aluminum oxide as secondary product of this method can be obtained.
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