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Normal-temperature chlorination dissolution treatment method for waste platinum-rhodium thermocouples

A treatment method and thermocouple technology, applied in the field of chemical engineering, can solve the problems of refractory NOx pollutants, failure to achieve energy conservation and environmental protection, and achieve the effect of large industrial application potential, promotion of dissolution rate, and simple operation

Active Publication Date: 2021-05-07
CHONGQING MATERIALS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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, and at the same time it will produce more difficult to handle NO x Pollutants and follow-up will undergo complex operations such as denitrification, which cannot achieve the purpose of energy saving and environmental protection

Method used

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  • Normal-temperature chlorination dissolution treatment method for waste platinum-rhodium thermocouples
  • Normal-temperature chlorination dissolution treatment method for waste platinum-rhodium thermocouples
  • Normal-temperature chlorination dissolution treatment method for waste platinum-rhodium thermocouples

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Effect test

Embodiment 1

[0072] 1500mL concentration is that the hydrochloric acid of 4mol / L is mixed with the iron-based ionic liquid that pre-prepared 200mL concentration is 8mol / L, then weigh the waste and old platinum-rhodium thermocouple fragments (number 1: Pt90wt%, Rh10wt%) that have been pretreated clean. %) placed in the mixed solution, and then feed chlorine gas at a rate of 2L / min to make the chlorine gas in the mixed solution saturated, after stirring evenly, sample 5mL of the mixed solution every 15min, and use the icp-aes analyzer to analyze the platinum content of the mixed solution. ions and rhodium ions are detected. When the contents of platinum ions and rhodium ions in the mixed solution reached 98%, the stirring was stopped, and chlorine gas was stopped;

Embodiment 2

[0074] 1500mL concentration is the hydrochloric acid of 8mol / L and the 300mL concentration prepared in advance is the iron-based ionic liquid of 4mol / L and mixes, and then weighs the 200g waste and old platinum-rhodium thermocouple fragments that have been pretreated cleanly (number 1: Pt80wt%, Rh20wt%) %) in the mixed solution, and then feed chlorine gas at a rate of 2L / min to make the chlorine gas in the mixed solution saturated, after stirring evenly, sample 5mL of the mixed solution every 15min, and use the icp-aes analyzer to analyze the platinum content of the mixed solution. ions and rhodium ions are detected. When the contents of platinum ions and rhodium ions in the mixed solution reached 98%, the stirring was stopped, and chlorine gas was stopped;

Embodiment 3

[0076] 1500mL of hydrochloric acid with a concentration of 12mol / L and the pre-prepared 400mL of 2mol / L iron-based ionic liquid are mixed, and then 200g of waste platinum-rhodium thermocouple particles (number 1: Pt70wt%, Rh30wt%) that have been pretreated are weighed. %) in the mixed solution, and then feed chlorine gas at a rate of 2L / min to make the chlorine gas in the mixed solution saturated, after stirring evenly, sample 5mL of the mixed solution every 15min, and use the icp-aes analyzer to analyze the platinum content of the mixed solution. ions and rhodium ions are detected. When the contents of platinum ions and rhodium ions in the mixed solution reached 98%, the stirring was stopped, and chlorine gas was stopped;

[0077] Materials consumed in table 1 embodiment 1~3

[0078]

[0079] In summary, the present invention utilizes Cl 2 The oxidation and the hypochlorous acid produced dissolve the platinum-rhodium alloy material, and the iron-based ionic liquid is enr...

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Abstract

The invention relates to the field of chemical engineering, in particular to a normal-temperature chlorination dissolution treatment method for waste platinum-rhodium thermocouples. The method comprises the following steps that (1) an iron-based ionic liquid is prepared; (2) the waste platinum-rhodium thermocouples are chlorinated and dissolved at the normal temperature; and (3) elemental rhodium and elemental platinum are purified and separated. According to the method, platinum-rhodium alloy materials are dissolved by the aid of the oxidation action of Cl2 and generated hypochlorous acid at the normal temperature, the iron-based ionic liquid is synthesized from 1-butyl-3-methyl chloro imidazole and ferric trichloride hexahydrate to enrich platinum-rhodium ions and accelerate dissolution of the platinum-rhodium alloy materials, platinum and rhodium can be enriched and recovered through just uniform stirring, and high-temperature conditions are not needed, so that the energy consumption is reduced, the technological cost is reduced, and harmless and resourceful treatment for recovering of waste platinum-rhodium alloys is achieved; the direct recovery rate of the waste thermocouples treated through the method is 98% or above, and the method conforms to the sustainable development road advocated in China and also conforms to the era theme in the current world.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a method for dissolving and dissolving waste platinum and rhodium thermocouples at normal temperature. 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 se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCC22B7/007C22B7/006C22B11/046Y02P10/20
Inventor 罗凤兰吴保安秦钊王丹冉义斌唐会毅梁源玲王云春
Owner CHONGQING MATERIALS RES INST