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A kind of normal temperature chlorination dissolution treatment method of waste platinum and rhodium thermocouple

A treatment method and thermocouple technology, applied in the field of chemical engineering, can solve the problems of energy saving and environmental protection, difficult to deal with NOx pollutants, etc., and achieve the effects of large industrial application potential, promotion of dissolution rate, and low input cost.

Active Publication Date: 2022-07-08
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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  • A kind of normal temperature chlorination dissolution treatment method of waste platinum and rhodium thermocouple
  • A kind of normal temperature chlorination dissolution treatment method of waste platinum and rhodium thermocouple
  • A kind of normal temperature chlorination dissolution treatment method of waste platinum and rhodium thermocouple

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Mix 1500 mL of hydrochloric acid with a concentration of 4 mol / L and a pre-prepared 200 mL of iron-based ionic liquid with a concentration of 8 mol / L, and then weigh 200 g of pretreated waste platinum-rhodium thermocouple fragments (No. 1: Pt90wt%, Rh10wt %) is placed in the mixed solution, then the chlorine gas is fed into the mixed solution at a speed of 2L / min to make the chlorine gas in the mixed solution saturated. The content of ions and rhodium ions was detected. When the contents of platinum ions and rhodium ions in the mixed solution both reach 98%, stop stirring and stop feeding chlorine gas; the reagents consumed by dissolving platinum-rhodium alloys in this embodiment are shown in Table 1.

Embodiment 2

[0074] Mix 1500mL of hydrochloric acid with a concentration of 8mol / L and a pre-prepared 300mL of iron-based ionic liquid with a concentration of 4mol / L, and then weigh 200g of pretreated waste platinum-rhodium thermocouple fragments (No. 1: Pt80wt%, Rh20wt %) is placed in the mixed solution, then the chlorine gas is fed into the mixed solution at a speed of 2L / min to make the chlorine gas in the mixed solution saturated. The content of ions and rhodium ions was detected. When the contents of platinum ions and rhodium ions in the mixed solution both reach 98%, stop stirring and stop feeding chlorine gas; the reagents consumed by dissolving platinum-rhodium alloys in this embodiment are shown in Table 1.

Embodiment 3

[0076] Mix 1500 mL of hydrochloric acid with a concentration of 12 mol / L and a pre-prepared 400 mL of iron-based ionic liquid with a concentration of 2 mol / L, and then weigh 200 g of pretreated waste platinum-rhodium thermocouple fragments (No. 1: Pt70wt%, Rh30wt %) is placed in the mixed solution, then the chlorine gas is fed into the mixed solution at a speed of 2L / min to make the chlorine gas in the mixed solution saturated. The content of ions and rhodium ions was detected. When the contents of platinum ions and rhodium ions in the mixed solution both reach 98%, stop stirring and stop feeding chlorine gas; the reagents consumed by dissolving platinum-rhodium alloys in this embodiment are shown in Table 1.

[0077] Table 1 Materials consumed in Examples 1 to 3

[0078]

[0079] To sum up, the present invention utilizes Cl at normal temperature 2 The oxidation effect and the generated hypochlorous acid dissolve the platinum-rhodium alloy material, and use 1-butyl-3-meth...

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Abstract

The invention relates to the field of chemical engineering, in particular to a method for treating waste platinum-rhodium thermocouples by chlorination at room temperature, comprising the following steps: 1) preparing an iron-based ionic liquid; 2) chlorinating and dissolving waste platinum-rhodium thermocouples at normal temperature; 3) Purify and separate elemental rhodium and elemental platinum. The present invention utilizes Cl at normal temperature 2 The oxidation action and the hypochlorous acid produced make the platinum-rhodium alloy material dissolve, and with 1-butyl-3-methylchloroimidazole and ferric chloride hexahydrate synthesizing iron-based ionic liquid enrichment platinum-rhodium ions to accelerate the dissolution The platinum-rhodium alloy material only needs to be stirred evenly to enrich and recover platinum and rhodium, and does not require high temperature conditions, thereby saving energy consumption, reducing process costs, and realizing the recycling and recycling of waste platinum-rhodium alloys. The treated waste thermocouple has a direct yield of more than 98%, which is in line with the sustainable development road advocated by our country, and also in line with the theme of the times in today's 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 room temperature by chlorination. 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...

Claims

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Application Information

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Patent Type & Authority Patents(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