1.Shaanxi Institute of Geology and Mineral Resources Experiment,Xi’an 710054,China; 2.Shaanxi Key Laboratory of Exploration and Comprehensive Utilization of Mineral Resources,Xi’an 710054,China
Abstract：It is well known that the chemical phase analysis results are greatly influenced by the particle size of sample. However, how to control the particle size of sample is rarely reported. During the establishment of chemical phase analysis method for representative arsenic ore samples in China, the analysis results of sample with different particle sizes were compared to investigate the different between phase states. It was found that the particle size of two kinds of arsenic ore sample (which were mainly composed of orpiment-realgar and arsenopyrite) should be controlled below 0.100 mm to guarantee the accuracy and reliability of chemical phase analysis results. Meanwhile, the automatic mineral liberation analyzer (MLA) was applied for the determination of degree of mineral liberation for arsenic ore samples with different particle sizes. The relationship between phase analysis results and degree of mineral liberation of ore samples was discussed. It was proved that the influence of sample particle size on chemical phase selectivity was related to the dissociation degree of monomineral. For the arsenic ore which was mainly composed of orpiment and realgar, the phase analysis results were accurate and reliable when the degree of mineral liberation of orpiment and realgar was higher than 75%. For the arsenic ore which was mainly composed of arsenopyrite, the processing particle size of sample should be controlled to realize that the degree of mineral liberation of arsenopyrite was higher than 88%.
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