关键词: 浸取, 回收, 浆料, 赤泥, 脱碱

Abstract: Deficiencies of red mud dealkalization mainly exist in the high consumption of acid or alkali，high removal cost，low concentration of alkali in simple water washing. Therefore， the comprehensive utilization of red mud cannot be achieved. This research investigated influences of leaching rate and concentration，temperature，liquid-solid ratio，leaching speed and other factors on the alkali，the alkali leaching rate and concentration with temperature，liquid changes to solid ratio，extraction rate and other factors，with anionic polyacrylamide as flocculant，water as extractant，using five stage countercurrent leaching of alkali in red mud recycling. The optimum extraction conditions were determined as the follwing：temperature 70℃，liquid to solid ratio 3∶1，leaching rate of 15mL/min. Under the above conditions，alkali in red mud leaching rate reached 89.71%，concentration reached 20.44g/L.

Key words: leaching, recovery, slurry, red mud, removal of alkali