溶剂溶解盐湖低品位固体钾盐的动力学研究

发布时间：2018-09-09 14:18

【摘要】：低品位钾矿溶浸开采时,存在资源浪费严重和溶浸通道被阻断的问题,为了使资源得到充分高效的利用,需改进开采方式及工艺条件。通过单因素试验和正交试验进行溶浸开采工艺条件的研究,考察了溶矿固液比、溶剂中Na Cl的质量分数和Mg Cl2的质量分数三个影响因素,确定最佳工艺条件为:溶矿固液比1:0.5;溶剂配比为氯化钠含量为其饱和度的50%(Na Cl的质量分数为13.24%);氯化镁的质量分数为3%;溶解时间为72h。该条件下溶矿后矿液中KCl的含量大于1.2%,且盐矿骨架不坍塌,溶浸通道畅通,符合工艺要求。在上述实验结论基础上研究马海盐矿中K+、Na+溶解性能和溶解规律,分别选取质量分数为13.24%(即饱和度为50%)的Na Cl溶液和Na Cl+Mg Cl2混合溶液(Na Cl、Mg Cl2质量分数分别为13.24%、3%)为溶剂进行试验,并与水作比较,从而得出其在不同溶剂中的溶解动力学方程。测得数据绘制离子c-t图,进行非线性拟合后得到溶解动力学曲线;再用龙格-库塔微分方程组和单纯形优化法拟合求解stumm模型中的K、n两个参数,程序由matlab编写,最终确定离子的溶解动力学方程并得出不同溶剂中K+、Na+的溶解规律:溶剂中加入Na Cl时,矿液中K+的溶解速率明显增大,且矿液中Na+的溶解速率大幅度减小;再引入Mg2+,K+的溶解速率明显增大,溶解速率常数K由0.1126增大到0.8749,且矿液中Na+的溶解速率常数K也保持在10-10级水平。
[Abstract]:In order to make full and efficient utilization of low grade potassium ore, there are some problems such as serious waste of resources and blocking of leaching channel. In order to make full use of the resource, the mining method and technological conditions should be improved. Through single factor test and orthogonal test to study the technological conditions of leaching and mining, three factors affecting the ratio of solute to liquid, the mass fraction of Na Cl in solvent and the mass fraction of Mg Cl2 were investigated. The optimum technological conditions are as follows: the ratio of solution to solid to liquid is 1: 0.5; the ratio of solvent to sodium chloride is 50% (Na Cl with its saturation is 13.24%); the mass fraction of magnesium chloride is 3%; and the dissolution time is 72 h. Under this condition, the content of KCl in ore solution after ore dissolution is more than 1.2, and the skeleton of salt ore does not collapse, and the leaching channel is open, which conforms to the technological requirements. On the basis of the above experimental conclusions, the solubility and dissolution law of K ~ (2 +) Na in Mahai Salt Mine are studied. Na Cl solution with 13.24% mass fraction (i.e. 50% saturation) and Na Cl Mg Cl2 mixed solution (13.24% Na Cl,Mg Cl2 mass fraction) were chosen as solvents, and compared with water, their dissolution kinetics equations in different solvents were obtained. The ion c-t diagram was drawn from the measured data and the dissolution kinetics curve was obtained after nonlinear fitting, and then the Runge-Kutta differential equation group and simplex optimization method were used to fit and solve the two parameters in the stumm model. The program was written by matlab. Finally, the dissolution kinetics equation of ions was determined and the dissolution law of K ~ (2 +) Na in different solvents was obtained. When Na Cl was added into the solution, the dissolution rate of K in ore solution increased obviously, and the dissolution rate of Na in ore solution decreased significantly. The dissolution rate of Mg2 + K increases obviously, the dissolution rate constant K increases from 0.1126 to 0.8749, and the dissolution rate constant K of Na in ore solution is kept at 10-10 level.
【学位授予单位】：青海大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD871.1

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