杂卤石地浸开采实验室模拟  

Modeling of leaching process of polyhalite in laboratory

作　　者：安莲英[1] 杨站君 刘宁[1] 殷辉安[1] 唐明林[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059 [2]青海省地质矿产勘查开发局,青海西宁810006

出　　处：《化工矿物与加工》2008年第10期24-27,共4页Industrial Minerals & Processing

基　　金：自然科学基金(40473035)资助

摘　　要：采用CaCl2溶液作溶浸剂,通过柱浸渗滤试验考察了矿石粒度、溶浸剂氯化钙溶液质量分数、渗滤速度、渗滤路径长度等参数对杂卤石中钾的溶出的影响。试验表明,矿石粒度的大小对体系浸出影响较大。当粒度由2～3mm增大至5～8mm时,K+的浸出率由80.19%降低至42.17%;K+的浸出率随溶浸液的渗滤速度、渗滤路径长度增加而增大;在相同的渗滤速度下,增加渗滤路径长度可提高浸出液中K+的体积质量。试验测得,K+在浸出液中的最大体积质量12.1g/L。浸出过程符合金属浸出动力学模型。浸出液中K+体积质量同渗滤速度与渗滤路径长度之比呈指数关系。根据试验结果计算得到模型中相关参数:当渗滤速度由0.159m/h提高至0.318m/h时,浸出速率常数由0.278h-1增大至0.6725h-1,金属充分浸出开始到进入液所需的时间由2.333h降为0.951h。研究结果为地浸开采埋藏较深的杂卤石提供了初步的试验基础。Take CaCl2 as lixiviant, the effect of the leaching conditions such as concentration of lixiviant （CaClz）, granularity of mineral, the velocity of solution flow and the length of mineral filtration route on the process of lixiviation are studied based on analysing potassium concentrations in the lixiviating solution. The experiment results show that the granularity of mineral is one of the most influencing factor to the recovery of K^＋ from polyhalite which decreases from 80.19% to 42.17% while granularity of mineral changes from 2-3 mm to 5--8 mm. The recovery of K^＋ from polyhalite increases with the velocity of solution flow and the length of mineral on the process of lixiviation. The concentration of potassium ion in lixiviating solution can be heightened to 12.1 g/L by increasing the length of mineral. The dynamic of lixiviation of polyhalite in CaCl2 solution was studied based on the heterogeneous-phase reaction dynamic principle and the experimental data. The lixiviation procedure matches the dynamic model of metal dissolving founded. The parameters in the equation are calculated according to the experiential results. The velocity parameters of leaching improve from 0. 278 h^-1 to 0. 6725 h^- 1 and the time from sufficiency dissolve to inter solution of metal lowers from 2. 333 h to 0. 951 h while the velocity of solution flow increases from 0. 159 m/h to 0. 318 m/h. This lahoratorial study provides a base for leaching experiment in field.

关 键 词：杂卤石 钾 地浸 渗滤实验 

分 类 号：TD871[矿业工程—非金属矿开采] P619.211[矿业工程—矿山开采]