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A sampling preprocessing and multi-channel switching pH measurement device

A measuring device and pretreatment technology, applied in measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problem of the average service life of electrodes less than 20 days, excessive maintenance workload and operating costs, and increasing the difficulty of pH measurement systems and other issues, to achieve the effect of reducing the number of equipment and electrodes, reducing maintenance workload, and measuring accurately and reliably

Active Publication Date: 2017-08-29
YUNNAN HUALIAN ZINC & INDIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The automatic timing cleaning of the electrode is adopted. Although the measurement sensitivity of the electrode is improved and the calibration period of the electrode is extended, the cleaning effect is still not ideal, and the temperature of the medium is as high as 80-95°C, exceeding the limit service temperature of the electrode, which accelerates the aging of the electrode. The average service life is still less than 20 days
The above situation causes excessive maintenance workload and operating cost of the online detection system of pH value, which increases the difficulty of long-term normal operation and application promotion of the pH measurement system, and also affects normal process operation and reduces production efficiency

Method used

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Embodiment 1

[0044] Example 1: figure 1 Components and instruments above the middle dividing line are installed on the stainless steel bottom plate. Sampling points 1-4 correspond to 4 PH measuring points on the process. Each sampling point is equipped with immersion filters F1-F4, which are installed on the outlet chute of the reaction tank. The filtering part Immersed in the medium, the negative pressure generated by the pneumatic diaphragm pump PM makes the solution enter the filter cavity through the filter surface, and the sampling tube is inserted into the bottom of the cavity. The immersion filter F1-F4 uses ceramic filters, sampling tube connectors and installation It is composed of brackets, which can be disassembled and replaced, and it is convenient to replace and perform manual cleaning when the filtration performance is significantly reduced; the CL outer casing of the sleeve cooler, that is, the cooling water circulation pipe, is made of DN40 304 stainless steel pipes, both en...

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Abstract

The invention discloses a sampling pretreatment and multi-flow switching pH measuring device, and relates to a sampling pretreatment device of a sample solution. The sampling pretreatment device is formed by a ceramic filter, a diaphragm pump, a buffer pool, a flow cell, a pH electrode, a pH transmitter, a pH electrode cleaning system, a PLC and multiple solenoid valves; and a multi-measuring-point sampling flow is automatically switched, filtered and cooled and then sent to a common pH measuring instrument for measurement, and a DCS system is used for reading and displaying measurement data.

Description

technical field [0001] The invention relates to a sampling pretreatment device for sample solution. Background technique [0002] In the leaching process produced in the non-ferrous metallurgical industry, it is necessary to accurately measure and analyze the pH value, acid concentration, and metal ion concentration of the leach pulp. Taking pH measurement as an example, since the measured medium is a liquid-solid mixed dirty fluid, it is very easy to cause fouling of the electrode sensitive membrane, which rapidly deteriorates the measurement performance and leads to lag and distortion of the measurement data. The conventional online detection method is to configure a pH measurement system with an automatic electrode cleaning device for each measurement point. The automatic timing cleaning of the electrode is adopted. Although the measurement sensitivity of the electrode is improved and the calibration period of the electrode is extended, the cleaning effect is still not i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/416
Inventor 易英敏黄维祥黄波蔡侑成
Owner YUNNAN HUALIAN ZINC & INDIUM
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