| Since the Three Gorges Reservoir begins to store water, Xiangxi River presents eutrophication and accompanying by the occurrence of algal blooms.Xiangxi River water environment has undergone great changes, however, the waste rock phosphate waters still using extensive open air accumulation. This paper mainly studies characteristics phosphorus release of phosphate gangue in Shukongping in Xingshan County under different environmental factors. According to the characteristics of local climate conditions and phosphate gangue itself, experiments are done such as the static leaching experiment, soil column leaching experiment of natural pH and soil column leaching experiment with different pH values in order to study that regular changes of waste rock phosphate phosphorus release under differing conditions of the ratio of solid to liquid, the sampling time of filtered liquid and the pH environment. The results showed that:(1) In different liquid-solid ratio static leaching conditions, the concentration of total phosphorus is leaching by solubility control; accumulation of phosphorus release is increasing with the liquid-solid ratio increases.(2) Dynamic leaching experiments show that the phosphorus release process is divided into three stages:The first stage of the reaction process between the solid and liquid phases; The second stage is the waste rock phosphate particles gradually formed a microporous silicate quality skeleton; The third stage is the reaction equilibrium between the solid and liquid phases.(3) Under different pH conditions static leaching, extracts of H+ helps to release phosphorus, but The OH- is less influence on phosphorus release. |
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