Protection device for online infrared temperature measuring instrument during rare earth pyrometallurgical process

Abstract

The invention relates to a protection device for an online infrared temperature measuring instrument during the rare earth pyrometallurgical process. The protection device comprises a protection outer shell, a filtering part and a rectification part, wherein the protection outer shell is made of an electromagnetic shielding material, and air inlet holes are formed in the side surface; the filtering part is an assembly for filtering fluoride and dust, is arranged in the protection outer shell and covers an outer shell of the infrared temperature measuring instrument; one end of the rectification part is in sealed connection with the protection outer shell, and a probe end of the infrared temperature measuring instrument is arranged inside the rectification part; a space between the filtering part and the infrared temperature measuring instrument is communicated with the interior of the rectification part; and the other end of the rectification part is provide with a protective gas outlet. The protection device effectively eliminates the influence of environmental factors such as high temperature, dust, corrosive atmosphere and strong electromagnetic field on the infrared temperature measuring instrument, and ensures the long-term and stable operation of the infrared temperature measuring instrument.

Description

technical field [0001] The invention relates to the technical field of on-line infrared temperature measurement in the rare earth pyrometallurgical process, in particular to a protection device for an online infrared temperature measurement instrument in the rare earth pyrometallurgical process. Background technique [0002] At present, in the process of rare earth pyrometallurgy, visual colorimetry or disposable thermocouples are widely used for temperature measurement. Visual colorimetry is used, and the temperature measurement results are affected by human factors. Using thermocouple temperature measurement technology, thermocouples will melt at high temperature or undergo galvanic corrosion during the measurement process, need to be replaced frequently, and affect the purity of rare earth metals. Due to the discontinuous temperature measurement process, automatic temperature control cannot be realized. [0003] Infrared temperature measurement technology is based on th...

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Problems solved by technology

[0005] Fluoride molten salts are highly corrosive at high temperatures. Traditional industrial refractory materials are difficult to use as rare earth electrolytic cell body materials. Graphite crucibles are usually used as electrolytic cells. The temperature measuring thermocouple inserted during the electrolysis process will be very It is quickly galvanically corroded, pollutes the electrolytic solution, and affects the purity of rare earth metal products

The electrolysis current in the electrolysis process is as high as tens of thousands of amperes, and the electromagnetic field around the electrolysis cell is very strong. Due to the change of the electrolysis working conditions, the alternating electromagnetic field is also very strong, which affects the circuit system of the infrared temperature measuring instrument; at the same time, the fluorine contained in the electrolyte volatilizes The gas will corrode the optical system of the temperature measuring instrument. The optical system is generally made of silicate glass. When encountering fluoride, it will react to form silicon fluoride and gaseous silicon tetrafluoride, which will reduce the light transmittance and affect the temperature measurement accuracy.

[0006] From the above brief description, it can be found that the rare earth pyrometallurgical production environment has the characteristics of high temperature, strong electromagnetic field, and corrosive gas, and the product has high purity requirements. Due to the limitations of these factors, at present, no matter contact measurement or non-contact temperature measurement, None of them can meet the requirements, and there is no ideal solution, which leads to the inability to measure the most critical process control parameters in the industry online and in real time, which affects the technological progress of the industry

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