Mineral particle model parameter calibration method based on discrete element method

Abstract

The invention provides a mineral particle model parameter calibration method based on a discrete element method. The mineral particle model parameter calibration method comprises the steps that a mineral particle model parameter constitutive model based on the discrete element method is built through physical test determination and a preliminary prepared method, and the constitutive model is usedfor being combined with stacking angle determination to carry out a physical and numerical simulation dual-directional test; on the basis of preliminary verification results, mineral particle model parameters are taken as independent variables to carry out an orthogonal numerical test, a stacking angle determination value is taken as an evaluation index to carry out regression analysis, and stacking angle physical test measurement is taken as a target value to build a regression model and determine a mineral particle model parameter optimal combination; and the determined optimal combination is verified through a numerical test again, and the mineral particle model parameters based on the discrete element method are determined finally. The technical scheme solves the problems of high difficulty in obtaining parameters and low measurement accuracy of an existing mineral particle model, and provides effective technical means for determining parameters of mineral particle numerical simulation tests.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a method for calibrating mineral particle model parameters based on a discrete element method. Background technique [0002] With the continuous development of mineral resources and the continuous improvement of mineral processing technology, the use of more advanced numerical simulation methods to predict and optimize the mineral separation process has become one of the key research points in the field of mineral processing technology. [0003] Discrete element method DEM (Discrete element method) is one of the important methods for numerical simulation of powder and bulk materials. It has been widely used in chemical industry, geophysics, civil engineering and other fields. Accuracy and other advantages have been gradually applied to the simulation research on the motion behavior of mineral processing particles, which provides an effective means for optimizing the pa...

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Problems solved by technology

In each process stage of mineral processing technology, due to the different processing techniques adopted, the properties of mineral particles are obviously different, and it is difficult to measure the characteristics of mineral particles at each stage. It is generally difficult to provide accurate and effective particle models for numerical simulation research of mineral processing. parameter

[0004] In the current numerical simulation research on the motion behavior of mineral particles, the particle parameters that are relatively easy to measure are generally obtained by conventional measurement methods. Contact parameters such as shear modulus and coefficient of elastic restitution of friction factor are generally obtained based on experience and relevant literature records, and are difficult to obtain through conventional physical test methods. It affects the accuracy of numerical simulation results and cannot provide scientific and effective guidance for the setting and optimization of process parameters

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