Ore milling concentration monitoring method for wet ball mill

Abstract

The invention relates to an ore milling concentration monitoring method for a wet ball mill. The method comprises the following steps of: 1) arranging a vibration sensor and a data acquisition device on a cylindrical wall of the ball mill; 2) acquiring vibration signals of the cylindrical wall of the ball mill by the vibration sensor, transmitting the vibration signals to the a data acquisition device, and drawing a statistical histogram of the vibration signals by the data acquisition device; 3) adopting laplace distribution of zero mean as best fit approximation of vibration signal distribution of the cylindrical wall of the ball mill according to the statistical histogram, and obtaining an estimated value of a vibration signal statistical parameter according to a maximum likelihood estimation of the laplace distribution; 4) changing the ore milling concentration in the ball mill to obtain a corresponding parameter estimated value; 5) expressing the ore milling concentration Cw in the ball mill as undetermined parameters a0, a1 and a2 in a quadratic polynomial determination expression of the ore milling concentration estimated value; and 6) acquiring the vibration signals of the cylindrical wall under different conditions, calculating the estimated value of the statistical parameter, substituting the estimated value into a quadratic polynomial determined in the step 5), and obtaining the corresponding estimated value of the ore milling concentration through calculation.

Description

technical field The invention relates to a monitoring method, in particular to a grinding concentration monitoring method of a wet ball mill. Background technique The ball mill is an important grinding equipment in the production of mineral resources. Its main function is to grind the ore to the particle size required by the subsequent production process. There are two types of ball mills: dry ball mill and wet ball mill. The main difference is whether water needs to be added as an intermediate grinding medium during ore grinding, and the ore discharge method in the ball mill. When the dry ball mill is working, no water is added, and the ground ore is discharged from the ball mill in time through the blast; when the wet ball mill is working, water needs to be added, and the fluidity of the slurry mixed with ground ore and water and the inclination angle inside the ball mill are used to The ground ore is discharged from the ball mill through the sieve holes. Therefore, acco...

AI Technical Summary

Problems solved by technology

Since the working principles of wet ball mills and dry ball mills are quite different, some methods for monitoring the operating conditions of dry ball mills, such as the motor power method and operating noise method, can be applied to the monitoring of wet ball mills, but the actual application poor effect

Other methods, such as the pressure difference method, cannot be applied in the monitoring of the operating conditions of the wet ball mill

In addition, due to the mixed movement of the pulp and steel balls in the wet ball mill, the pulp basically does not affect the trajectory of the steel balls, and the position of the maximum impact point on the barrel wall of the ball mill is basically fixed, regardless of the amount of pulp in the ball mill and the change of the grinding concentration. Therefore, , it is difficult to monitor the grinding concentration in the ball mill by detecting the maximum impact point on the wall of the ball mill

Images