Online forecasting method of pH value of ore pulp in bauxite flotation process

Abstract

The invention discloses an online forecasting method of a pH value of ore pulp in a bauxite flotation process. Aiming at the problem of lag of the pH value control due to relatively large time lag from the adding moment of a bauxite flotation ore pulp pH value regulator to the detecting moment of the pH value and the problem of low manual detection efficiency of the pH value, the method comprises the following steps: firstly building an ore alkali consumption regression model caused by reaction between ores and alkali; then building a pH value mechanism forecasting model according to hydrolysis of the alkali which does not react with the ores in water and the influence of alkaline circulating water on hydrolysis balance; building an error compensation model according to an error time sequence consisting of an actually measured value of the pH value and a forecasting value of the mechanism model; and correcting an error compensation direction according to the change of working conditions based on an expert rule, and compensating the mechanism model by using a corrected compensation value to obtain a forecasting value of the pH value of the ore pulp. The method is used for forecasting the pH value of the ore pulp in an actual production process; a root-mean-square error is 0.0935, and the maximum relative error is 2.83 percent; and the relative errors of 90 percent of test samples are within + / - 2 percent.

Description

technical field [0001] The invention relates to an online prediction method for pulp pH in the bauxite flotation process. Background technique [0002] Beneficiation Bayer process alumina production Through bauxite beneficiation, a large amount of low-grade bauxite in my country can be used in Bayer process production, which greatly saves production energy consumption and reduces emissions. The goal of bauxite beneficiation is to maximize the recovery rate of aluminum under the premise of ensuring the concentrate grade, and the recovery rate directly determines the utilization rate of the ore. [0003] Bauxite beneficiation adopts foam flotation method, by adding flotation agents to the pulp composed of ground mineral particles to adjust the surface properties of mineral particles, and passing air into the pulp to form bubbles, so that useful mineral particles are attached to the bubbles The surface floats with the air bubbles to form a foam layer, and the recovered foam is...

AI Technical Summary

Problems solved by technology

The pH value prediction based on foam characteristics is essentially a soft measurement of pH value, which cannot be used to solve the problem of pH control hysteresis caused by pulp staying in the grinding and classification process

Moreover, the pH control of the flotation process still completely depends on manual experience, and there is no effective online control method

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