基于粒子群算法优化BP神经网络的溶浸开采浸出率预测

为了研究溶浸开采过程中浸出率的预测问题,以含锑硫化矿的浸出过程为例,采用经粒子群算法优化的BP神经网络模型预测浸出率。首先分析得出影响矿物浸出率的主要因素,并将已有样本数据进行变量训练,建立BP神经网络预测模型;其次利用粒子群算法优化该模型;最后分别利用BP神经网络模型和PSO-BP神经网络模型预测浸出率,并对比2种模型预测值与实际值的误差精度。研究结果表明:影响含锑硫化矿浸出率的主要因素有温度、时间、液固比、搅拌速度和HCl浓度,且这些因素相互影响,其与浸出率呈现高度非线性关系,采用粒子群算法优化的BP神经网络模型训练精度较高,对浸出率的预测更精确,相比BP神经网络,该模型得出的预测结果与实际值的相对误差以及方差都有明显下降。由此可见,该预测模型对当前矿区溶浸开采的浸出率优化有一定的参考价值。

Based on Particle Swarm Algorithm to Optimize the BP Neural Network of Leaching Rate Prediction in Leaching Mining

With the development of mining technology,the development of mineral resources in China is progressing steadily.Nowadays,the mining trend is green mining mode with environmental protection and high safety.However,many mining methods are faced with serious pollution and low recovery rate.Leaching mining is a kind of mining method which combines mining,sorting and hydrometallurgy.In order to explore how to improve the leaching rate during the leaching process,in this paper,the leaching process of antimonial sulfide ore was taken as an example to analysis the main factors that influence the leaching rate.The BP neural network prediction model was established and optimized by the particle swarm algorithm,so it can conduct the variable training with existing sample data.Finally,the BP neural network model,the PSO-BP neural network model were used to predict leaching rate,respectively,and compared to two kinds of model error precision of the predicted values and actual values.The research results show that the impact containing antimony sulfide ore leaching rate of interaction between these factors and nonlinear relationship and leaching rate is more by 40 groups will affect the relationship between parameters and the leaching rate of leaching rate of data through the neural network training model to predict the 8 groups of leaching rate data,compare the leaching rate of output value and the actual values can be found using the particle swarm algorithm to optimize BP neural network model training accuracy is higher,the more accurate predictions for leaching rate,the prediction data set of normalized linear curve slope is more close to 1.Through further error analysis,it can be seen that compared with BP neural network,the relative errors and variances of the predicted results of the model optimized by particle swarm optimization algorithm and the actual values are significantly reduced.Therefore,this prediction model has certain reference value for the optimization of leaching rate in the current leaching mining area.