Device and system 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 a waste platinum-rhodium thermocouple. The device comprises a reactor shell, wherein a buffer air inlet chamber is arranged at the upper end of the reactor shell; a chlorine inlet is formed in the chamber wall of the buffer air inlet chamber; a motor is arranged at the upper end of the buffer air inlet chamber;a stirrer is arranged in a cavity of the reactor shell and made of a hollow pipe; the stirrer comprises an upper straight pipe section and a lower spiral bent structure section; the straight pipe section of the stirrer is in sliding fit with the reactor shell, extends into the buffer air inlet chamber and is fixedly connected with a rotating shaft of the motor; a plurality of air inlet holes are formed in the pipe wall of the straight pipe section, located in the buffer air inlet chamber, of the stirrer; and a plurality of air outlet holes are formed in the pipe wall of the spiral bent structure section of the stirrer. The device and system have the advantages that chlorine is circularly introduced through the device for dissolving the platinum-rhodium alloy in the waste platinum-rhodium thermocouple, tail gas is absorbed through a NaOH solution, energy conservation and environment protection are achieved, and the platinum-rhodium alloy can be continuously and rapidly dissolved at normal temperature.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a device and system 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 measuring instruments and measurement systems, the requirements for temperature measurement precision 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 adjustment and control of temperature. They have been widely used in medium temperatures of -200 to 2500°C such as gases, liquids, and steam. In large-scale temperature measurement, thermocouples have been widely used in power plants, production enterprises, scientific research institutes and other industries due to their small size, high sensi...

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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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