Composite material as well as preparation method and application thereof

Abstract

The invention relates to the field of waste catalyst treatment, and discloses a composite material as well as a preparation method thereof, wherein the composite material comprises a spherical inner layer and a coating layer coating at least part of the outer surface of the spherical inner layer, the coating layer is whisker-shaped and / or columnar, and the content of the coating layer is 5-30 wt%based on the total weight of the composite material. The composite material has high specific surface area and low water content; the content of harmful elements such as alkali metal, arsenic, iron and phosphorus in the composite material is remarkably reduced. When the composite material provided by the invention is used for preparing the denitration catalyst, roasting is not needed, and therefore the investment and the operation cost are remarkably reduced. Meanwhile, according to the method provided by the invention, valuable elements in the waste catalyst do not need to be respectively extracted, so that the technological process is simplified, the emission of waste byproducts is reduced, and the secondary pollution is reduced.

Description

technical field

[0001] The invention relates to the field of spent catalyst disposal, in particular to a composite material and its preparation method and application. Background technique

[0002] Catalysts play a very important role in the chemical industry. About 90% of chemical processes require the use of catalysts. At present, there are more than 2,000 types of catalysts used in the chemical industry, and the amount of catalysts used is more than 800,000 tons. The amount of spent catalyst produced worldwide is about 500,000-700,000 tons every year. It contains a lot of valuable metals, such as noble metals (Pt, Ru, Pd, Au and Ag, etc.), non-ferrous metals (Cu, Co, Ni, Cr, etc.) and so on.

[0003] The recovery of waste catalysts in my country started late, and landfills were often used to dispose of waste catalysts in the past, which not only polluted the environment, but also caused a waste of resources.

[0004] In recent years, with the country's emphasis on envir...

Examples

Embodiment 1

[0100] (1) Preparation of composite materials

[0101] a) 100 grams of waste denitrification catalyst was cleaned and soot blown under negative pressure, then ultrasonically cleaned and dried, then ball milled to 400 mesh, and then 600ml of NaOH solution with a mass fraction of 20wt% was added, treated at 180°C for 1 hour, and centrifuged. The solid-to-liquid ratio of spent denitration catalyst powder to surface treatment agent is 1:6g / mL.

[0102] b) Wash the filter residue in step a) three times with 200ml water respectively, then heat and stir 10wt% dilute sulfuric acid solution at 90°C for 30min, then wash with deionized water until the conductivity is 80μs / cm, and mix with water , beating to obtain a slurry, add 3wt% titanyl sulfate and 1wt% silane coupling agent to the above slurry, stir at room temperature for 1.5 hours, filter, then put the filter cake in an oven, and dry at 120°C After 24 hours, composite material A1 was obtained, with a moisture content of 8wt% and ...

Embodiment 2

[0104] (1) Preparation of composite materials

[0105] a) 100 grams of the waste denitration catalyst was cleaned, ultrasonically cleaned and dried, and then ball-milled to 400 mesh, then 200ml of NaOH solution with a mass fraction of 35wt% was added, reacted at 120°C for 4 hours, and then filtered to obtain a liquid phase and a solid phase, wherein , the solid-to-liquid ratio of the spent denitration catalyst powder to the surface treatment agent is 1:2g / mL.

[0106] b) The solid phase in step a) is first washed with deionized water until the conductivity is 69 μs / cm, then mixed with water and beaten to obtain a slurry, and 10 wt% is added to the above slurry Metatitanic acid and 1wt% silane coupling agent, stirred at 40°C for 1 hour, filtered to obtain a filter cake, then put the filter cake in an oven, and dried at 120°C for 24h to obtain composite material A2, containing water The ratio is 3.3wt%, and the specific surface area is 85m 2 / g, based on the total weight of th...

Embodiment 3

[0108] a) 100 grams of the waste denitration catalyst was cleaned, ultrasonically cleaned and dried, and ball-milled to 400 mesh, then 200ml of NaOH solution with a mass fraction of 25wt% was added, reacted at 135°C for 5 hours, and then filtered to obtain a liquid phase and a solid phase, wherein , the solid-to-liquid ratio of the spent denitrification catalyst powder to the surface treatment agent is 1:6g / mL, wherein the spent catalyst is a spent denitrification catalyst.

[0109] b) The solid phase in step a) is first washed with deionized water until the conductivity is 85 μs / cm, then mixed with water, beaten to obtain a slurry, and 6 wt% is added to the above slurry h 2 o 2 After 3 hours of treatment, add 6wt% titanium sulfate and stir at 50°C for 2 hours, filter to obtain a filter cake, and finally place the filter cake in an oven and dry at 120°C for 24 hours to obtain composite material A3. is 4.2wt%, and the specific surface area is 88m 2 / g, based on the total wei...

technical field

[0001] The invention relates to the field of spent catalyst disposal, in particular to a composite material and its preparation method and application. Background technique

[0002] Catalysts play a very important role in the chemical industry. About 90% of chemical processes require the use of catalysts. At present, there are more than 2,000 types of catalysts used in the chemical industry, and the amount of catalysts used is more than 800,000 tons. The amount of spent catalyst produced worldwide is about 500,000-700,000 tons every year. It contains a lot of valuable metals, such as noble metals (Pt, Ru, Pd, Au and Ag, etc.), non-ferrous metals (Cu, Co, Ni, Cr, etc.) and so on.

[0003] The recovery of waste catalysts in my country started late, and landfills were often used to dispose of waste catalysts in the past, which not only polluted the environment, but also caused a waste of resources.

[0004] In recent years, with the country's emphasis on envir...

Examples

Embodiment 1

[0100] (1) Preparation of composite materials

[0101] a) 100 grams of waste denitrification catalyst was cleaned and soot blown under negative pressure, then ultrasonically cleaned and dried, then ball milled to 400 mesh, and then 600ml of NaOH solution with a mass fraction of 20wt% was added, treated at 180°C for 1 hour, and centrifuged. The solid-to-liquid ratio of spent denitration catalyst powder to surface treatment agent is 1:6g / mL.

[0102] b) Wash the filter residue in step a) three times with 200ml water respectively, then heat and stir 10wt% dilute sulfuric acid solution at 90°C for 30min, then wash with deionized water until the conductivity is 80μs / cm, and mix with water , beating to obtain a slurry, add 3wt% titanyl sulfate and 1wt% silane coupling agent to the above slurry, stir at room temperature for 1.5 hours, filter, then put the filter cake in an oven, and dry at 120°C After 24 hours, composite material A1 was obtained, with a moisture content of 8wt% and ...

Embodiment 2

[0104] (1) Preparation of composite materials

[0105] a) 100 grams of the waste denitration catalyst was cleaned, ultrasonically cleaned and dried, and then ball-milled to 400 mesh, then 200ml of NaOH solution with a mass fraction of 35wt% was added, reacted at 120°C for 4 hours, and then filtered to obtain a liquid phase and a solid phase, wherein , the solid-to-liquid ratio of the spent denitration catalyst powder to the surface treatment agent is 1:2g / mL.

[0106] b) The solid phase in step a) is first washed with deionized water until the conductivity is 69 μs / cm, then mixed with water and beaten to obtain a slurry, and 10 wt% is added to the above slurry Metatitanic acid and 1wt% silane coupling agent, stirred at 40°C for 1 hour, filtered to obtain a filter cake, then put the filter cake in an oven, and dried at 120°C for 24h to obtain composite material A2, containing water The ratio is 3.3wt%, and the specific surface area is 85m 2 / g, based on the total weight of th...

Embodiment 3

[0108] a) 100 grams of the waste denitration catalyst was cleaned, ultrasonically cleaned and dried, and ball-milled to 400 mesh, then 200ml of NaOH solution with a mass fraction of 25wt% was added, reacted at 135°C for 5 hours, and then filtered to obtain a liquid phase and a solid phase, wherein , the solid-to-liquid ratio of the spent denitrification catalyst powder to the surface treatment agent is 1:6g / mL, wherein the spent catalyst is a spent denitrification catalyst.

[0109] b) The solid phase in step a) is first washed with deionized water until the conductivity is 85 μs / cm, then mixed with water, beaten to obtain a slurry, and 6 wt% is added to the above slurry h 2 o 2 After 3 hours of treatment, add 6wt% titanium sulfate and stir at 50°C for 2 hours, filter to obtain a filter cake, and finally place the filter cake in an oven and dry at 120°C for 24 hours to obtain composite material A3. is 4.2wt%, and the specific surface area is 88m 2 / g, based on the total wei...

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