Process Optimization of Hydrochloric Acid Leaching of Asbestos Tailings
Improving reaction effectiveness of asbestos tailings and acid is main means to increase the productivity of magnesium hydroxide and amorphous silica and to reduce production costs.In this paper,the process optimization of acid-leaching reaction process of asbestos tailings is reported.Through the orthogonal experiments of four influence factors,such as acid consumption,reaction temperature,reaction time and initial acid concentration in the leaching reaction.The experiment results indicated that the optimal process parameters were as follows: reaction temperature was 95 ℃,reaction time was 1.5h,acid consumption was 218.9g hydrochloric acid(37%) per 100g asbestos tailings and initial acid concentration was about 25%.The influence significance sequence of the four factors was as follows: reaction temperature ＞ reaction time ＞ mass concentration of hydrochloric acid ＞ hydrochloric acid consumption.Under the optimum process conditions,the leaching rate of MgO was 97.3%,total iron 98.15% and Al2O3 57.9%.
Asbestos tailings Hydrochloric Acid Hydrometallurgy Process optimization
G.X.Du H.Ding Y.Liu S.L.Zheng
School of Materials Science and Technology,China University of Geosciences,Beijing,China Department of Chemical and Environment Engineering,China University of Mining and Technology,Beijing
国际会议
XXIV International Mineral Processing Congress(第24届国际矿物加工大会)
北京
英文
3759-3764
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）