Determination of Andalusite Content in Ores by Chemical Phase Analysis Method

The preliminary discussion on the determination of andalusites content in ore samples by chemistical phase analysis method is proposed. The sample was treated with HF-cold dissolution method. Then the residue was filtered and fused with Na2O2 and extracted with hot water. The concentration of Al2O3 was determined by titration method with zinc acetate standard solution and converted into the content of andalusite. Based on the compositional characteristics of andalusite and its associated minerals in Yuedu ore region of Qinhai Province, the effects of experimental conditions including different solvents, dosage of solvents, soaking temperature and time, sample granularity on sample dissolution rate were studied in details. And the correction coefficient was calculated based on the dissolution rate of andalusite in synthesized samples. The aluminiumimetry is chosen as the chemical phase analysis of andalusite in ores.