engleski

Stability determination of concentrated alumina suspensions which contain waste alumina powder

This paper reports the results of studying the alumina ceramics which contain a considerable amount of waste alumina powder. During the green machining of the green body, a certain amount of waste ceramic powder is generated which remains unused. In addition, the waste ceramic powder should be disposed of as a non‐hazardous waste in a legally prescribed manner. In this paper the influence of Tiron dispersant on the stability of highly concentrated alumina (Al2O3 – Al2O3 (waste)) suspensions was investigated. The suspension stability of alumina particles has been investigated by measuring the viscosity and the zeta potential. Alumina particles were found to be optimally dispersed at pH between 8 and 10 with the dispersant Tiron. According to the conducted measurements, the investigated composition of waste alumina powder of 20 wt.%. expressed on dry weight basis of alumina powders, with the addition of optimal amounts of additives, indicates possible application in the production of ceramics products by slip casting.

Alumina ; Waste ; Suspension ; Stability ; Tiron

Croatian‐Slovenian bilateral project “Properties of monolithic and composite advanced ceramics obtained by conventional and non‐conventional sintering methods”