{'fraction_non_alphanumeric': 0.024287222808870117, 'fraction_numerical': 0.012671594508975714, 'mean_word_length': 5.196078431372549, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Application of stirred mill to upgrading of graphite concentrate by flotation

ABSTRACT It is difficult to obtain high-grade concentrates for layered minerals, such as graphite, by mineral processing due to the existence of impurities between interlayers. Conventional grinding mills are inefficient in liberating the mineral layers. Upgrading a graphite concentrate by re-grinding with a designed stirred mill is investigated in this paper. Better liberation of mineral layers was achieved, compared with a ball mill and a rod mill. Through re-grinding with the stirred mill followed by a two-stage cleaning flotation process, a low-grade graphite concentrate containing 84.59% fixed carbon could be refined to a high-quality concentrate containing 98.62% fixed carbon with a graphite recovery of 94.15%. It is demonstrated that the stirred mill is more suitable for selective grinding, mineral flake protection and upgrading of layered minerals.