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Recovery method for palladium metal in waste palladium-carbon catalyst

A technology of palladium carbon catalyst and recovery method, which is applied in the field of precious metal recovery, can solve the problems of large environmental pollution and low content of precious metals in the recovery process, and achieve the effect of reducing pollutant discharge and volume

Active Publication Date: 2016-12-14
陕西瑞科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for recovering palladium metal in waste palladium carbon catalysts, which solves the problems of large environmental pollution and low content of recovered precious metals in existing recovery processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Register the waste palladium carbon catalysts to be recovered in batches, and carry out detection and testing at the same time to determine the content of palladium inside and whether it contains chlorine, so as to ensure that the subsequent treatment process of each batch of waste palladium carbon catalysts is relatively stable. Independent and independent of each other; add the recovered palladium-carbon catalyst and water into the reaction kettle at a ratio of 1:5, raise the temperature to 60°C, stir and wash for 2 hours, and then centrifuge while it is hot to remove the water-soluble components and The liquid components and filtrate are mixed with other production wastewater in the factory area and then sent to the sewage treatment station for advanced treatment to ensure that the discharge meets the standard, and the filter cake is used for standby;

[0031] Step 2, put the filter cake obtained in step 1 into a high-temperature electric furnace for incinerat...

Embodiment 2

[0035] Step 1. Register the waste palladium carbon catalysts to be recovered in batches, and carry out detection and testing at the same time to determine the content of palladium inside and whether it contains chlorine, so as to ensure that the subsequent treatment process of each batch of waste palladium carbon catalysts is relatively stable. Independent and independent of each other; add the recovered palladium carbon catalyst and water into the reaction kettle at a ratio of 1:8, raise the temperature to 70°C, stir and wash for 1.5 hours, and then centrifuge while it is hot to remove the water-soluble components in the spent palladium carbon catalyst and liquid components, the filtrate is mixed with other production wastewater in the plant area, and then enters the sewage treatment station for advanced treatment to ensure that the discharge meets the standard, and the filter cake is used for standby;

[0036] Step 2, put the filter cake obtained in step 1 into a high-tempera...

Embodiment 3

[0040]Step 1. Register the waste palladium-carbon catalysts to be recovered in batches, and carry out detection and testing at the same time to determine the content of palladium inside and whether it contains chlorine, so as to ensure that the subsequent treatment process of each batch of waste palladium-carbon catalysts is relatively stable. Independent and independent of each other; add the recovered palladium-carbon catalyst and water into the reaction kettle at a ratio of 1:10, heat up to 80°C, stir and wash for 1 hour, and then centrifuge while it is hot to remove the water-soluble components and The liquid components and filtrate are mixed with other production wastewater in the factory area and then sent to the sewage treatment station for advanced treatment to ensure that the discharge meets the standard, and the filter cake is used for standby;

[0041] Step 2, put the filter cake obtained in step 1 into a high-temperature electric furnace for incineration, and raise ...

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Abstract

The invention discloses a recovery method for palladium metal in a waste palladium-carbon catalyst. The palladium-carbon catalyst is subjected to incineration treatment, and then after ash is subjected to dissolution and filtration, ammonium chloride is added into the ash for palladium precipitation. Finally, hydrazine hydrate is added into the mixture, sponge palladium is obtained, and after washing and drying treatment, the palladium metal is obtained. According to the recovery method, hot water washing is adopted first, water-soluble impurities and part of liquid components in the waste palladium-carbon catalyst can be directly removed, and pollutant discharge during later incineration is reduced. After mixed, a filtrate and other factory industrial wastewater together enter a sewage treatment station for deep treatment so as to ensure up-to-standard discharge. Through high-temperature incineration, activated carbon and organic matter are removed, the size is decreased, and favorable conditions are provided for subsequent precious metal dissolution. After the ash is subjected to dissolution, filtration, precipitation purification, dissolution, reduction and final washing, high-purity palladium is obtained. The purity of the palladium recovered through the process can reach 99.9% or above.

Description

technical field [0001] The invention belongs to the technical field of precious metal recovery, and in particular relates to a method for recovering palladium metal in waste palladium carbon catalysts. Background technique [0002] Palladium carbon catalysts are mainly used in the hydrogenation process of fine chemical industries such as pharmaceutical synthesis, dye synthesis, pesticide synthesis, and liquid crystal intermediate synthesis. In practical operation, it plays an irreplaceable important role. As time goes by, the activity and selectivity of the palladium-carbon catalyst will gradually decrease until it becomes deactivated, thus losing its use value. However, there are still a considerable amount of palladium-carbon catalyst The precious metal palladium; the recovery of palladium can obtain considerable economic benefits, reduce the pollution of the waste catalyst to the environment, and achieve sustainable development, which is of great significance in today's i...

Claims

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Application Information

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IPC IPC(8): C22B11/00
CPCC22B11/048
Inventor 周淑雁蔡万煜周爱玲
Owner 陕西瑞科新材料股份有限公司
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