Heap Leaching Chaotic Characteristics Of The Infiltration Surface And Control Theory

The saturated area is an important subject in the field of heap leaching. Based on the review of researching on heap leaching at home and abroad, the saturated surface of heap leaching is researched deeply and thoroughly for the first time in nonlinear dynamics. The purpose of this work is to reveal evolvement mechanism of the saturated surface and bring forward a technique antitype to control saturated area.The influence rule of the saturated surface and the relation of the saturated surface and leaching rate are new research tasks. In this dissertation, the influence rule of the saturated surface and the relation of the saturated surface and leaching rate are proved up by simulating heap leaching in the lab. This work is of guiding significance to the understanding of actual distribution of saturated surface in heap and infiltrating course of leaching solution as well as to rational construction of heap and distribution of leaching solution for the improvement of recovery rate of valued constituent.During the heap leaching process, the saturated surface is affected by many kinds of uncertain factors, so it is very hard to describe the evolvement rule truly. In this dissertation, the largest Lyapunov exponents and the correlation dimension are applied to analyze the monitoring data of the saturated surface of simulation test. The results show that the evolution of the saturated surface is a chaos system, and the state of the seepage can be evaluated by the largest Lyapunov exponents. Not only does the work reveal evolution essential of the saturated surface but also point out a new way to analyze the monitoring data.According to the fact that the saturated surface evolvement exists chaos state which gives affection to the state of the seepage, a method of controlling chaos is put forward based on OGY method(weak perturbation). The essence of this method is to analyze the largest Lyapunov exponents and use to discriminate the change of chaotic character in time series before and after superposing a periodic vibration, and further realize chaos control. With this method, the monitoring data of the saturated surface of simulation test is analyzed. The results show that the chaos can be restrained by superposing a periodic vibration.Based on this theory, a technique antitype that tube-pouring is brought forward and the feasibility is analyzed by theory.The evolvement of the saturated surface is a complicated nonlinear dynamical system. The nonlinear dynamical characteristic correlates nearly with the recovery rate of valued mineral. To analyze the nonlinear characteristic, it is necessary to gain many essential data by monitoring. Forecasting is an important content for the monitoring data. In this dissertation, a linear model is proposed by using local prediction method. The results show that the calculating quantity of the proposed forecasting model is less and the model is prone to be operated and the precision of forecasting is better. The value of the forecasting accords with the monitoring data, which can be used to forecast the saturated surface. The effectiveness of the proposed model is tested by comparison of the monitoring data with GM(1,1) model. The comparison shows that the model is better than GM(1,1) model.With regard to the kind of complicated porous medium like heap, it is very important to grasp the distribution rule of seepage filed in heap. During the long time heap leaching process, gravity and rain cause the heap to concentrate. Under this circumstance, the leaching solution is hard to infiltrate, which can lead the seepage filed to distribute asymmetrically. In this dissertation, Fluent is applied to simulate the seepage filed. By studying the distribution rule and the variational characteristic of the seepage field, the technique route is brought forward to improve the distribution of the seepage field for the sake of recovery rate of valued constituent.