A device for dissolving platinum-rhodium alloy in waste platinum-rhodium thermocouple

Abstract

The invention discloses a device and a system for dissolving platinum-rhodium alloy in waste platinum-rhodium thermocouple, comprising a reactor shell, a buffer gas inlet chamber is arranged on the upper end of the reactor shell, and a chlorine gas gas inlet is arranged on the chamber wall of the buffer gas inlet chamber The upper end of the buffer inlet chamber is provided with a motor, and a stirrer is arranged in the cavity of the reactor shell. The agitator is made of a hollow tube. The agitator includes an upper straight pipe section and a lower spiral curved structure section. The straight pipe section of the agitator The straight pipe section extends into the buffer air inlet chamber and is fixedly connected to the rotating shaft of the electric motor. The pipe wall of the straight pipe section of the agitator located in the buffer air inlet chamber is provided with a number of air inlet holes, and the agitator is spirally bent. Several air outlet holes are arranged on the pipe wall of the structural section. The advantage of the invention is that chlorine gas is circulated into the device for dissolving platinum-rhodium alloy in waste platinum-rhodium thermocouple, and the tail gas is absorbed by NaOH solution, which not only saves energy and protects the environment, but also realizes continuous and rapid dissolution of platinum-rhodium alloy at normal temperature.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a device for dissolving platinum-rhodium alloys in waste platinum-rhodium thermocouples. Background technique [0002] With the development of temperature measurement technology and the continuous improvement of the performance of measurement instruments and measurement systems, the requirements for temperature measurement accuracy and accuracy are becoming more and more stringent. Thermocouples can directly convert temperature into electrical quantities during temperature measurement, and are especially suitable for automatic temperature adjustment and automatic control. In a wide range of temperature measurement, thermocouples have been widely used in power plants, production enterprises, scientific research institutes and other sectors due to their small size, high sensitivity and stable output signal. [0003] At present, low-cost K-type nickel-chromium thermocouples are ...

AI Technical Summary

Problems solved by technology

The above improved HCl-HNO 3 Although the process can dissolve the platinum-rhodium alloy better, it needs to be carried out at a higher temperature. At the same time, it will produce difficult NOx pollutants and follow up with complex operations such as denitrification, which cannot achieve the purpose of energy saving and environmental protection.

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