Online measurement device for measuring pH value of leached neutralizing tank slurry of uranium ore hydrometallurgical mill

Abstract

The invention provides an online measurement device for measuring a pH value of leached neutralizing tank slurry of a uranium ore hydrometallurgical mill. The device comprises a pH sensor for measuring the pH value, a pH converter for converting a measurement signal and an automatic cleaning device. The composite pH sensor suitable for a medium system is selected, the device with a regular automatic cleaning function is added for the pH sensor on such a basis, and a cleaning controller is regularly and automatically controlled to control an electromagnetic valve to be opened and closed and control a booster pump to be started and stopped to realize automatic cleaning of the composite pH sensor through a pH converter computer system. According to the device, the measurement accuracy is less than or equal to + / -0.1pH when the pH value of the leached neutralizing tank slurry is measured by a certain uranium ore hydrometallurgical mill, and the requirement of an industrial production site on accurate measurement of the pH value of the leached slurry is met.

Description

technical field [0001] The invention relates to an on-line pH value measuring device, in particular to an on-line measuring device for measuring the pH value of the neutralization tank slurry in the leaching process of a uranium ore water smelting plant. Background technique [0002] In the fields of metallurgy, chemical industry, sugar refining, pharmaceuticals, mineral processing, sewage treatment and other fields, the application requirements of pH measurement and control systems are very common. There are many methods for pH measurement, the most basic is the potentiometric method, and other methods are usually based on the data of the potentiometric method. as the basis. The potentiometric pH meter represented by a glass electrode has been widely used. Although the glass electrode has disadvantages such as fragility and cracking, there is no alternative product yet. In some non-pollution or good water quality applications, the glass electrode pH meter can be placed in ...

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Problems solved by technology

[0004] (1) The continuity of the whole process is strong, and the acidity value in the neutralization tank must be accurately measured at each stage of production

[0005] (2) The milk of lime used for neutralization contains incompletely dissolved particles, and the slurry contains a large amount of sediment. During the neutralization reaction of the slurry, it is accompanied by strong mechanical agitation, and the solid particles and sediment have a strong impact and wear on the glass electrode. , which seriously affects the service life of the electrode, and may even break the glass bubble of the measuring electrode and completely scrap the electrode

[0006] (3) The particles of the production process medium are small and the medium itself has high viscosity and adhesion. After a period of time, it adheres to the surface of the electrode probe, thereby isolating the contact between the sensitive film on the electrode surface and the measurement medium, causing the measurement distortion of the acidity meter

[0007] (4) The medium to be measured has strong acidity and alkalinity and is highly corrosive. If the glass electrode is placed in the liquid to be measured for a long time, it is easy to age or damage

[0008] (5) The medium temperature is high, which is conducive to scaling and affects the service life of the electrode

[0009] Based on the actual working conditions of uranium water smelting plants in my country, the application status of the existing general-purpose pH value measurement and control system is not optimistic. Some insoluble salts scale on the pH glass electrode, which quickly passivates the sensitive film of the electrode, seriously affects the measurement accuracy and dynamic response characteristics of the electrode, and requires frequent manual cleaning of the electrode, which virtually increases the labor intensity of the workers. Electrodes are easily damaged during cleaning

Second, due to the high temperature of the leached pulp, accompanied by strong mechanical agitation, the service life of the electrode is short, the error is large, the stability is poor, and the maintenance is large, etc.

Based on the difficulties in the detection and control of the above process parameters, most of the uranium ore smelting plants in my country have not realized the online detection of the pH value of the ore pulp.

At present, the automation level of the leaching production process of my country's uranium ore water smelting plants is low, the labor intensity is high, and the output and quality fluctuate greatly.

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