Method for automatically controlling the PH of slurry by using lime milk and slag

By combining an online density meter, redundant dual pH electrodes, and a Kalman filter, along with a delayed alkali quantity prediction model and a physical constraint digestion kinetic modeling network, the lime slurry flow rate is dynamically adjusted. This solves the problem that the slurry pH control system cannot predict the potential alkali quantity caused by the delayed alkali release of slag lime slurry, and achieves precise and stable control of slurry pH.

CN122346191APending Publication Date: 2026-07-07YUNNAN TITANIUM TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN TITANIUM TECHNOLOGY CO LTD
Filing Date
2026-04-16
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In existing technologies, the delayed alkali release of slag lime slurry causes the slurry pH control system to be unable to predict the potential alkali content, resulting in a systemic over-alkali phenomenon.

Method used

A Kalman filter combined with an online density meter and redundant dual pH electrodes was used to estimate the pH of the slurry. A Smith predictor compensator was used to offset the pure hysteresis. A delayed alkali quantity prediction compensation model and a physical constraint digestion kinetic modeling network were combined. The lime slurry flow rate was dynamically adjusted through a gain scheduling controller to achieve feedforward compensation and prediction of potential alkali quantity.

Benefits of technology

It effectively eliminates the systemic over-alkali phenomenon caused by delayed alkali release from Inger slag lime slurry, ensuring the accuracy and stability of slurry pH control, and avoiding the passive response of traditional controllers under delayed alkali release conditions.

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Abstract

The present application provides a kind of method for automatically controlling ore pulp PH with lime milk of grid residue, belong to the technical field of automatically controlling ore pulp PH with lime milk of grid residue, the present application is calculated by online densimeter and ore pulp temperature sensor effective alkali concentration of lime milk and feedforward correction flow setting value, utilize redundant double pH electrode and kalman filter fusion estimation ore pulp pH value, based on mechanism titration curve model driving gain scheduling controller in different pH work interval automatic switching proportional band parameter, and the cumulative concentration prediction value of ore pulp output by physical constraint digestion kinetics modeling network is fed back to gain scheduling controller correction dosing output, solve the technical problem that lime milk of grid residue delayed release alkali leads to ore pulp pH control system cannot predict potential alkali amount, cause systematic over-alkaline.
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