The mixture ratio of phosphogypsum in back-filling
Filling the goaf with phosphogypsum can reduce damage to the environment due to phosphate mining.Therefore, research was conducted to test the feasibility of using phosphogypsum as a backfill aggregate, concentrating on the mixture ratio of filling materials and the filling process.First, the physical and chemical characteristics of phosphogypsum, fly ash and yellow phosphorus slag were determined, respectively.Then, two types of cement strength tests were performed.One type of cementation was made up of phosphogypsum, cement and fly ash; the other was made up of phosphogypsum, yellow phosphorus slag, alkali-activator and composite water reducer.The test results show that by adding fly ash, the characteristics of phosphogypsum change making it usable as a backfill aggregate.In addition, the curing agent of cement can be replaced by the yellow phosphorus slag, and a reasonable mixture ratio for backfill materials can be obtained.The new cemented backfill technology (in which the phosphogypsum is used as the main filling aggregate) is developed and used to fill the goaf of the phosphate mine in YongShaBa (KaiLin Group).Engineering practice shows that the phosphogypsum filling technology can greatly relieve the environmental damage inflicted during phosphate mining, and significant economic benefits can be achieved.
Phosphate mining Backfill Material mixture ratio Phosphogypsum Yellow phosphorus slag
Wen-gang Dang Zhi-xiang Liu Xian-qun He Qing-ling Liu
School of Resources and Safety Engineering,Central South University,Changsha 410083,China
国内会议
长沙
英文
190-201
2014-03-01（万方平台首次上网日期，不代表论文的发表时间）