Trapping agent for recovering platinum group metal from nitrate industrial ammonia oxidation furnace and application of trapping agent

A platinum group metal and ammonia oxidation furnace technology, applied in the field of collectors, can solve the problems of increasing the cost of nitric acid, shortening the service life of the platinum alloy catalytic net, and losing the catalytic activity of the platinum alloy catalytic net, achieving low cost, small resistance, and easy to use long life effect

Inactive Publication Date: 2014-10-01
KUNMING NANBO REGENERATION RESOURCE TECH RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The palladium alloy trapping net installed in the ammonia oxidation furnace is placed under the platinum alloy catalytic net. When the reaction temperature is out of control, the palladium alloy trapping net and the platinum alloy catalytic net will be sintered and bonded together, causing the platinum alloy catalytic net to lose its catalytic activity. Shorten the service life of the platinum alloy catalytic network, affect the production capacity of nitric acid, and increase the cost of nitric acid production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare the collector by the following steps:

[0023] ①Add 18kg of ethylenediamine, 6kg of ethanolamine and 45kg of deionized water into the container, stir evenly and add 13kg of palladium oxalate and 1.7kg of nickel oxalate while stirring, stir well to dissolve the palladium oxalate and nickel oxalate completely, stir During the process, the temperature of the solution is controlled between 25°C and the stirring time is controlled within 2 hours;

[0024] ②Use the solution obtained in step ① to immerse 50 kg of ceramic Raschig rings at a temperature of 20°C for 30 minutes, and then filter to remove excess solution. The specific parameters of the ceramic Raschig ring used are as follows: specification Φ16mm, diameter×height×wall thickness 16×16×3, specific surface area 250, porosity 66, stacking weight 820, stacking The number is 178,000, and the dry packing factor is 870.

[0025] ③Put the ceramic Raschig ring obtained in step ② into a closed electric furnace, fill...

Embodiment 2

[0028] Prepare the collector by the following steps:

[0029] ①Add 18kg of ethylenediamine, 6kg of ethanolamine and 45kg of deionized water into the container, stir evenly and add 18kg of palladium oxalate and 2.4kg of nickel oxalate while stirring, stir well to dissolve the palladium oxalate and nickel oxalate completely, stir During the process, the temperature of the solution is controlled between 25°C and the stirring time is controlled within 2 hours;

[0030] ②Use the solution obtained in step ① to immerse 50 kg of ceramic Raschig rings at a temperature of 20°C for 60 minutes, and then filter to remove excess solution. The specific parameters of the ceramic Raschig ring used are as follows: specification Φ25mm, diameter×height×wall thickness 25×25×3, specific surface area 147, porosity 78, stacking weight 510, stacking The number is 42000, and the dry packing factor is 310.

[0031] ③ Put the ceramic Raschig ring obtained in step ② into a closed electric furnace, fill ...

Embodiment 3

[0034]①Add 18kg of ethylenediamine, 3.6kg of ethanolamine and 36kg of water into the container, stir evenly, add 12.6kg of palladium oxalate and 0.9kg of nickel oxalate while stirring, stir well to dissolve the palladium oxalate and nickel oxalate completely, stir During the process, the solution temperature was controlled at 20°C, and the stirring time was controlled at 2 hours;

[0035] 2. Submerge the ceramic Raschig ring with the solution obtained in step 1. After immersing the ceramic Raschig ring at 10°C for 30 minutes, filter to remove excess solution. %, the mass ratio of nickel content is 0.2%; the specific parameters of the ceramic Raschig ring used are as follows: specification Φ16mm, diameter×height×wall thickness 16×16×3, specific surface area 250, porosity 66, stacking weight 820, stacking number 178000, dry fill factor 870.

[0036] ③ Put the ceramic Raschig ring obtained in step ② into a closed electric furnace, fill it with nitrogen, raise the temperature to ...

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Abstract

The invention relates to a trapping agent for recovering platinum group metal from a nitrate production process. The technology comprises the following processes: (1) adding 1 part of ethanediamine, 0.2-1 part of cholamine and 2-6 parts of water to a container, adding 0.7-1.5 parts of potassium bispalladate dehydrate and 0.05-0.2 part of nickel oxalate when agitating, controlling the temperature of a solution at 20-30 DEG C in the agitating process, and agitating for 2-3 hours; (2) soaking a raschig ring by using the solution obtained in the step (1) at 10-50 DEG C for 30-60 minutes; (3) putting the raschig ring obtained in the step (2) into a sealed electric furnace, filling nitrogen, warming to 100 DEG C within 20-40 minutes, carrying out heat preservation at 100-120 DEG C for 1-2 hours, then warming to 300 DEG C within 20-40 minutes, carrying out heat preservation at 300-400 DEG C for 1-2 hours, then warming to 500 DEG C within 20-40 minutes, naturally cooling to obtain the trapping agent after heat preservation at 500-650 DEG C for 1-3 hours. The trapping agent can be used for 6-8 months, and is low in platinum group metal recovery cost, the production efficiency of the nitrate is not affected, and the purity of the recovered platinum can be up to 99.96%.

Description

Technical field [0001] The invention involves the field of precious metal recycling, and it is more specifically a catcher used to recycle platinum metal in the process of nitric acid production. Background technique [0002] Nitric acid is an important chemical raw material. It is an important raw material for manufacturing chemical products such as explosives, fertilizers, plastics, and dyes. It is widely used in the fertilizer industry, agriculture, chemical industry, defense industry, inorganic chemical products, chemical fiber and metallurgical industry. [0003] During the production of nitric acid, the ammonia oxidation reaction pressure was 0.1 to 1.0MPa and the reaction temperature was 780 to 950 ° C. The catalytic network material used was PTRH or PTPDRH alloy.Under this thermodynamic conditions, the oxide of the platinum 钯 铑 is generated and volatile oxides, and the platinum oxidation is PTO 2 , 铑 oxidation to RHO 2 , RH 2 O 3 The oxygen oxidation is PDO, which forms a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 吴立生王咏梅高应梅李斌王晶张敏
Owner KUNMING NANBO REGENERATION RESOURCE TECH RES
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