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An online detection system for oxygen ions in high temperature molten salt

A detection system, high-temperature molten salt technology, applied in the direction of material electrochemical variables, etc., can solve the problems of large volume, small range of oxygen concentration measurement, inconvenient detection of oxygen ions, etc.

Active Publication Date: 2020-01-24
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrial measuring element for measuring the oxygen concentration in high temperature liquid metal is Mn / MnO 2 、Cr / Cr 2 o 3 、Bi / Bi 2 o 3 It is a zirconia electrode for internal reference, but these electrodes have a small range of measuring oxygen concentration and are large in size, so it is not convenient for the laboratory to detect the concentration of oxygen ions in a small amount of high-temperature molten salt on-line

Method used

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  • An online detection system for oxygen ions in high temperature molten salt
  • An online detection system for oxygen ions in high temperature molten salt
  • An online detection system for oxygen ions in high temperature molten salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The operation steps are as above, but the structural parameters are different. The specific parameters are: the size of the zirconia tube is 6mm, the wall thickness is 1mm, and the length is 150mm; the internal reference molten salt is 0.75mol / kg silver chloride and 0.03mol / kg carbonic acid Lithium chloride, potassium chloride eutectic salt powder of lithium, the mass is 1g; the temperature of the high-temperature molten salt is 500°C.

[0036] Insert the zirconia oxygen electrode into the molten salt of lithium chloride and potassium chloride at 500°C, pass hydrogen chloride gas into the molten salt, the electromotive force of the zirconia electrode rises rapidly, and reaches re-stabilization within 400s; wait for a period of time to stabilize Then stop feeding hydrogen chloride gas, and start feeding argon gas, the hydrogen chloride in the molten salt is removed by bubbling, and the potential of the electrode begins to decrease; Stable within 400S. Repeat the above ope...

Embodiment 2

[0038] Operation is identical with embodiment 1, and its difference is: zirconia tube size is 6mm, wall thickness 2mm, long 150mm; Internal reference molten salt is the lithium chloride of 0.4mol / kg silver chloride and 0.03mol / kg lithium carbonate 1. Potassium chloride eutectic salt powder, the mass is 0.5g; the temperature of the high-temperature molten salt is 575°C.

[0039] Insert the zirconia electrode into the molten salt of sodium chloride and calcium chloride at 575°C. Add lithium carbonate to the molten salt, and the electromotive force decreases rapidly. After stabilization, hydrogen chloride gas is introduced into the molten salt, and the electromotive force of the zirconia oxygen electrode rises rapidly and stabilizes within 400s. The oxygen ion in the high-temperature molten salt is measured The concentration is 6ppm.

Embodiment 3

[0041] Operation example 1 is identical, and its difference is: zirconia tube size is 6mm, wall thickness 1mm, long 150mm; Internal reference molten salt is the lithium chloride of 0.8mol / kg silver chloride and 0.1mol / kg lithium carbonate, Potassium chloride eutectic salt powder, the mass is 0.75g; the temperature of the high-temperature molten salt is 575°C.

[0042] Insert the zirconia electrode into the molten salt of lithium chloride and potassium chloride at 400°C. Add lithium carbonate to the molten salt, and the electromotive force decreases rapidly. After stabilization, hydrogen chloride gas is introduced into the molten salt, and the electromotive force of the zirconia oxygen electrode rises rapidly and stabilizes within 400s. The oxygen ion in the high-temperature molten salt is measured The concentration is 4ppm.

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Abstract

The invention belongs to the technical field of high temperature fused salt electrochemical analysis and testing, and provides an on-line detection system used for detecting oxygen ions in high temperature fused salt. The on-line detection system comprises a zirconia oxide electrode, a reference electrode, a thermocouple, a temperature recorder, an electrochemical workstation, a computer, a fixing device and signal wires; the zirconia oxide electrode, the reference electrode and the thermocouple are fixed to the fixing device through a lower portion electrode fixing piece; the zirconia oxide electrode and the reference electrode are connected with the electrochemical workstation through the signal wire; the thermocouple is connected with the temperature recorder through the signal wire; the electrochemical workstation and a temperature recorder are connected with the computer. The detection system is simple in structure, convenient to assemble, small in size and light in weight, and is applicable to the concentration of oxygen ions in the high temperature fused salt of various components, on-line detection is achieved, and the system is very suitable for being used in laboratories.

Description

technical field [0001] The invention belongs to the field of electrochemical analysis and testing of high-temperature molten salts, in particular to an online detection system for oxygen ions in high-temperature molten salts. Background technique [0002] High-temperature molten salt is often used as a chemical reaction medium in the metallurgical industry because of its good electrical conductivity, low vapor pressure, low viscosity, and large heat capacity. With the rapid development of molten salt metallurgy, the molten salt metallurgy process has higher requirements on the quality of molten salt, in which the concentration of oxygen ions in molten salt is an important factor in the properties of molten salt, which affects the molten salt metallurgy process very big. Therefore, it is very important to accurately determine the concentration of dissolved oxygen ions in molten salts. [0003] At present, there is no unified and general method for the determination of oxyge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26
CPCG01N27/26
Inventor 肖益群何辉林如山贾艳虹孟照凯
Owner CHINA INSTITUTE OF ATOMIC ENERGY