本文系统阐述了菱镁矿的地质因素和国内外选矿方法，并提出符合国情的浮选途径。通过试验和生产，在国内成功地浮选出与海水提镁相媲美的高纯镁砂．为利用天然资源、确保宝钢生产做出了贡献。 This paper systematically describes the geological factors of magnesite and mineral processing methods at home and abroad, and puts forward the flotation approach in line with the national conditions. Through trial and production, we successfully flotation high-purity magnesia that is comparable to seawater magnesium in China. To make full use of natural resources to ensure the production of Baosteel has made its contribution.