Experimental method and apparatus for alumina dissolution rate measurement

2 Experimental method and apparatus for alumina dissolution rate measurement 

With an established alumina refinning process, the particle size distribution of alumina is stable in general. The average grain size of alumina samples is between 60 and 70 pm, belonging to intermediate alumina. 

The composition of the electrolyte is shown in Table 1.8.1. Two hundred grams of electrolyte were added into the quartz crucible. Temperature was controlled at 955 1 °C during the experiment, giving the electrolyte an initial superheat above liquidus of about 3 °C. Two grams of alumina sample was charged into the transparent molten salt at one time. When the previous alumina had been completely dissolved and the temperature returned to the constant 955 °C, another addition was done until the newly added sample dissolved slowly or crucible was seriously damaged by bath corrosion. 

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