Method and system for treating load type palladium-contained dead catalyst

Abstract

The invention discloses a method and system for treating a load type palladium-contained dead catalyst. A carrier of the load type dead catalyst is alpha-Al2O3 or SiO2-alpha-Al2O3. The method includes the steps that 1, the palladium-contained dead catalyst is calcinated; 2, the calcinated dead catalyst is leached, and the carrier and palladium-contained leachate are obtained; 3, exchange treatment is conducted on the palladium-contained leachate, exchanged liquid and resin for adsorbing palladium are obtained, and most of the exchanged liquid is returned to be leached; 4, the resin for adsorbing palladium is desorbed; 5, desorbed liquid is refined, and palladium products are obtained. By the adoption of the method, the reagent use amount can be greatly reduced, reduction of the production process is achieved, and the recovery rate of palladium reaches up to 99% or above.

Description

technical field

[0001] The invention belongs to the technical field of chemical industry, in particular, the invention relates to a method and system for treating spent palladium-containing catalysts. Background technique

[0002] Precious metals are rare resources, and the spent catalysts made from them play an irreplaceable role in the petrochemical industry. After long-term use, the spent catalyst gradually loses its activity due to the deposition of carbon-containing substances or the poisoning of various harmful impurities. separate. The precious metal waste catalysts currently used in industry are mainly based on alumina or silica as a carrier. With the development of industry and the shortage of resources, precious metals in spent catalysts, as precious secondary resources, have a very large recovery value.

[0003] At present, most of the methods for recycling waste catalysts containing precious metals at home and abroad only recover the precious metals, but the c...

Examples

specific Embodiment

[0049] In one aspect of the present invention, the present invention provides a method for treating supported palladium-containing spent catalyst. According to an embodiment of the present invention, the carrier of the supported spent catalyst can be α-Al 2 o 3 or SiO 2 -α-Al 2 o 3 , it should be noted that SiO 2 -α-Al 2 o 3 Can be understood as containing SiO 2 and α-Al 2 o 3 mixture. Refer below Figure 1-2 The method for treating the supported palladium-containing spent catalyst according to the embodiment of the present invention is described in detail. According to a specific embodiment of the invention, the method includes:

[0050] S100: Roasting the spent palladium-containing catalyst

[0051] According to the embodiment of the present invention, the spent catalyst containing palladium is roasted, so that the carbon deposits and organic matter in the spent catalyst can be effectively removed.

[0052] According to the embodiment of the present invention, ...

Embodiment 1

[0104] The spent supported palladium-containing spent catalyst (the carrier is SiO 2 -α-Al 2 o 3 ) was roasted at 600° C. for 3 hours under the condition of dust collection and tail gas absorption, then got 1500 grams of spent catalyst (containing palladium 0.27wt%) after roasting, and divided into 3 parts, each part of 500 grams, numbered respectively as 1#, 2#, 3#, under the condition of negative pressure and tail gas absorption, add 2L of 4.0mol / L hydrochloric acid solution to 1#, heat to 75°C, and slowly add 5-15mL of 10wt% sodium chlorate solution dropwise, After reacting for 1 hour, most of the palladium was transferred into the solution to obtain a palladium-containing leaching solution, and an ion exchange resin was used to exchange the obtained palladium-containing leaching solution to obtain the exchanged solution and the resin for adsorbing metal palladium, and return the exchanged solution to 1# for further processing. For the second leaching treatment, repeat th...

Embodiment 2

[0106] The spent supported palladium-containing spent catalyst (the carrier is SiO 2 -α-Al 2 o 3 ) was roasted at 600°C for 3 hours under the condition of dust collection and tail gas absorption, and then 18000 grams of spent catalyst (containing palladium 0.27wt%) was taken after roasting, divided into 36 parts, each 500 grams, divided into three groups of numbers, a total of 12 groups, that is, numbered 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, and so on, under the condition of negative pressure and exhaust gas absorption, add to 1-1 2L of 4.0mol / L hydrochloric acid solution was heated to 75°C, and 5-15mL of 10wt% sodium chlorate solution was slowly added dropwise, reacted for 1 hour, and most of the palladium was transferred into the solution to obtain a palladium-containing leaching solution. Repeat the above operations. 1-1 Carry out two more leachings, add an appropriate amount of water to the process ratio in the process, and so on, so that the total palladium-containing leaching...

technical field

[0001] The invention belongs to the technical field of chemical industry, in particular, the invention relates to a method and system for treating spent palladium-containing catalysts. Background technique

[0002] Precious metals are rare resources, and the spent catalysts made from them play an irreplaceable role in the petrochemical industry. After long-term use, the spent catalyst gradually loses its activity due to the deposition of carbon-containing substances or the poisoning of various harmful impurities. separate. The precious metal waste catalysts currently used in industry are mainly based on alumina or silica as a carrier. With the development of industry and the shortage of resources, precious metals in spent catalysts, as precious secondary resources, have a very large recovery value.

[0003] At present, most of the methods for recycling waste catalysts containing precious metals at home and abroad only recover the precious metals, but the c...

Examples

specific Embodiment

[0049] In one aspect of the present invention, the present invention provides a method for treating supported palladium-containing spent catalyst. According to an embodiment of the present invention, the carrier of the supported spent catalyst can be α-Al 2 o 3 or SiO 2 -α-Al 2 o 3 , it should be noted that SiO 2 -α-Al 2 o 3 Can be understood as containing SiO 2 and α-Al 2 o 3 mixture. Refer below Figure 1-2 The method for treating the supported palladium-containing spent catalyst according to the embodiment of the present invention is described in detail. According to a specific embodiment of the invention, the method includes:

[0050] S100: Roasting the spent palladium-containing catalyst

[0051] According to the embodiment of the present invention, the spent catalyst containing palladium is roasted, so that the carbon deposits and organic matter in the spent catalyst can be effectively removed.

[0052] According to the embodiment of the present invention, ...

Embodiment 1

[0104] The spent supported palladium-containing spent catalyst (the carrier is SiO 2 -α-Al 2 o 3 ) was roasted at 600° C. for 3 hours under the condition of dust collection and tail gas absorption, then got 1500 grams of spent catalyst (containing palladium 0.27wt%) after roasting, and divided into 3 parts, each part of 500 grams, numbered respectively as 1#, 2#, 3#, under the condition of negative pressure and tail gas absorption, add 2L of 4.0mol / L hydrochloric acid solution to 1#, heat to 75°C, and slowly add 5-15mL of 10wt% sodium chlorate solution dropwise, After reacting for 1 hour, most of the palladium was transferred into the solution to obtain a palladium-containing leaching solution, and an ion exchange resin was used to exchange the obtained palladium-containing leaching solution to obtain the exchanged solution and the resin for adsorbing metal palladium, and return the exchanged solution to 1# for further processing. For the second leaching treatment, repeat th...

Embodiment 2

[0106] The spent supported palladium-containing spent catalyst (the carrier is SiO 2 -α-Al 2 o 3 ) was roasted at 600°C for 3 hours under the condition of dust collection and tail gas absorption, and then 18000 grams of spent catalyst (containing palladium 0.27wt%) was taken after roasting, divided into 36 parts, each 500 grams, divided into three groups of numbers, a total of 12 groups, that is, numbered 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, and so on, under the condition of negative pressure and exhaust gas absorption, add to 1-1 2L of 4.0mol / L hydrochloric acid solution was heated to 75°C, and 5-15mL of 10wt% sodium chlorate solution was slowly added dropwise, reacted for 1 hour, and most of the palladium was transferred into the solution to obtain a palladium-containing leaching solution. Repeat the above operations. 1-1 Carry out two more leachings, add an appropriate amount of water to the process ratio in the process, and so on, so that the total palladium-containing leaching...

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