前言日本东北部地区受热液矿化作用生成的粘土矿床,大多被黄铁矿所污染。在利用时,需将黄铁矿除去。例如板谷粘土,虽用控床浮选选矿,但不能将微细黄铁矿除净。还要用氧化、还原漂白法才能够提高品位。近年来,随高梯度磁选机(HGMS法)的开发,使历来用磁分离法难除的顺磁性物质的分离成为可能,从而可考虑将其用于粘土的除铁精制。本研究的HGMS法对日本东 Foreword Clay deposits formed by hydrothermal mineralization in northeastern Japan are mostly contaminated by pyrite. In use, the need to remove the pyrite. For example, Plate Valley clay, although controlled by bed flotation beneficiation, but not the fine pyrite in addition to net. Also use oxidation, reduction bleaching method can improve the grade. In recent years, with the development of the high-gradient magnetic separator (HGMS method), the separation of paramagnetic substances, which have traditionally been difficult to remove by magnetic separation, has been made possible, so that it can be used for the iron removal refining of clay. The HGMS method of this study is based on Japan East