CAO Liqiong;ZHANG Lihong;GUO Yanxia;CHENG Fangqin;

• 1:State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources
• 2:Institute of Resources and Environmental Engineering
• 3:Shanxi University

Abstract：

The extraction of alumina from coal gangue is one of the main ways of high value utilization of coal gangue. Thermal activation can effectively stimulate the reaction activity of aluminum bearing minerals in coal gangue and improve the dissolution rate of aluminum in acid leaching process,which is a simple and effective way to activate coal gangue.However,the process is affected by calcination temperature,oxygen concentration,carbon content and other factors.In this paper,the effects of different oxygen concentration and calcination temperature on the efficiency of thermal activated acid leaching of gangue were investigated,and the effects of carbon content in coal gangue and anthracite coal gangue with carbon on the efficiency of thermal activated acid leaching of gangue were studied.The results show that the increasing oxygen concentration( 0-21%) can significantly improve the leaching rate of aluminum from coal gangue after thermal activation.When the oxygen concentration is increased to 21%,that is close to the air atmosphere,the leaching rate of aluminum reaches to 74.24%.However,when the oxygen concentration is increased to 50%,the effect on the leaching rate of aluminum is not significant.In addition,when the calcination temperature is between 600 ℃ and 900 ℃,with the increase of calcination temperature,the alumina leaching rate of coal gangue after calcining presents a trend of first increasing and then decreasing slowly.When the calcination temperature is 700 ℃,the alumina leaching rate reaches to 72.99%.But when the calcination temperature is increased to 900 ℃,the aluminum leaching rate is greatly reduced to 31.77%.Besides,the loss of coal gangue is mainly caused by the combustion of organic matter,such as carbon,which has a certain effect on the leaching rate of activated aluminum.The loss on ignition increases with the increase of oxygen concentration( 0-21%) and calcination temperature. The increase of loss on ignition is propitious to the increase of leaching rate of aluminum,mainly because of the increase of gas released from roasting process and the loosening of coal gangue,which makes the contact between active component and acid more fully,and thus is propitious to the leaching of aluminum. Lastly,the effect of carbon content in coal gangue and coal gangue with carbon on the leaching efficiency of aluminum from coal gangue by thermal activation acid is similar.When the carbon content is less than 23%,the leaching rate of aluminum decreases with the increase of carbon content.But when the carbon content is above 23%,the leaching rate of aluminum increases with the increase of carbon content.

Key Words： coal gangue;carbon content;thermal activation;hydrochloric acid leaching;aluminum extraction rate

Abstract:

Keywords:

Foundation: 国家重点研发计划资助项目(2017YFB0603100,2017YFB0603101);; 山西省煤基低碳科技重大专项资助项目(MC2016-05);; 山西省应用基础研究项目(201801D221328);; 山西省高等学校科技创新项目(2017109)

Authors: CAO Liqiong;ZHANG Lihong;GUO Yanxia;CHENG Fangqin;

DOI: 10.13226/j.issn.1006-6772.19082301

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