Treatment method of oil sludge pyrolysis ash

Abstract

The invention discloses a treatment method of oil sludge pyrolysis ash. The method comprises the following steps: deoiling, drying and grading the size of the oil sludge pyrolysis ash, and screening the oil sludge pyrolysis ash into particles less than or equal to 0.15 mm, particles of 0.15-4.75 mm and particles greater than 4.75 mm; after washing and desliming the particles with the particle size of less than or equal to 0.15 mm and the particles with the particle size of more than 4.75 mm, carrying out mechanical-chemical activation treatment to obtain oil sludge pyrolysis ash powder; the 0.15-4.75 mm particles are reinforced through a matrix and an interface, and reinforced oil sludge pyrolysis ash fine aggregate is obtained; the obtained oil sludge pyrolysis ash powder can replace 1-30% of the mass of cement-based material cement, and 0.15-4.75 mm particles can be used as fine aggregates to replace 1-20% of the mass of cement-based material building sand; the cement-based material admixture prepared based on the method can be used for preparing cement mortar and concrete; a new path is provided for resource utilization of the oil sludge pyrolysis ash, and the problems of environmental pollution and land occupation caused by the oil sludge pyrolysis ash are solved.

Description

Technical Field

[0001] This invention relates to the field of building materials and solid waste resource utilization technology, specifically to a cement-based material admixture with pyrolysis sludge as the main raw material and its preparation method, which is applicable to the production and application of cement-based building mortar and concrete. Background Technology

[0002] Oily sludge is a typical hazardous solid waste generated during petroleum refining and oil and gas extraction. Current disposal methods primarily rely on landfill, incineration, and pyrolysis. While pyrolysis can recover oil and gas, it inevitably produces pyrolysis ash, creating secondary storage pressure due to its limited utilization. Compared to traditional mineral admixtures, oily sludge pyrolysis ash, although primarily composed of Si... It is dominated by inorganic phases such as CaO and has good compatibility with cement-based systems, but it generally contains glassy Si inclusions. Problems such as high proportion, residual carbon and soluble salt inclusions, and smooth and hydrophobic particle surface can lead to insufficient release of activity and limited early strength and durability when directly incorporated.

[0003] To address the aforementioned problems, this invention proposes a resource utilization route for pyrolysis ash from oily sludge: combining oil removal, screening, desliming, and drying processes to obtain particles ≤0.15 mm, 0.15~4.75 mm, and >4.75 mm. On one hand, the ≤0.15 mm and >4.75 mm particles of the pyrolysis sludge are finely ground to a particle size below 0.15 mm, producing an oily sludge pyrolysis ash powder admixture. This is further enhanced by chemical synergistic activation to improve the potential pozzolanic reactivity of the admixture, enabling it to partially replace cement as a powder material. On the other hand, based on the matrix and interface strengthening of the 0.15~4.75 mm particles of the oily sludge pyrolysis ash, it can be used as fine aggregate to partially replace building sand in the preparation of cement mortar or concrete.

[0004] Compared with existing similar technologies, patents CN118388179A, CN116354649A, and CN119330671A use oil sludge pyrolysis residue in cement-stabilized crushed stone, road base concrete, and foamed lightweight soil as road materials. While oil sludge pyrolysis residue can be used in conjunction with cement in road materials and exhibits some reactivity, its reactivity is relatively low. Furthermore, the strength of cement mortar / concrete is typically much higher than that of road materials. Therefore, this invention activates the oil sludge pyrolysis ash powder admixture and strengthens the matrix and interface of the oil sludge pyrolysis ash fine aggregate, which is not addressed in CN118388179A, CN116354649A, and CN119330671A. Patent CN115536430A utilizes oily sludge to prepare sound insulation boards, and CN102924028A utilizes oily sludge sand to produce aerated foam concrete blocks. Neither of these preparation processes involves activation of the oily sludge pyrolysis ash powder admixture or reinforcement of the fine aggregate matrix and interface. Patents CN115403402A, CN115215636A, CN115304353B, and CN109851323A utilize oily sludge, oily sludge pyrolysis tailings, or oily sludge pyrolysis residue to prepare ceramsite, all requiring high-temperature sintering, resulting in high energy consumption. This invention, through physicochemical activation, allows direct use in ordinary mortar or concrete, avoiding high energy consumption and the need for specialized equipment.

[0005] The difference and substantial progress of this invention lies in the following: For the application of pyrolysis sludge ash in cement-based materials, a technical system has been established: "clean pretreatment (degreasing and desludge removal) → fine grinding and mechanochemical activation of pyrolysis sludge ash particles ≤0.15mm and >4.75mm to obtain pyrolysis sludge ash powder admixture → pyrolysis sludge ash powder admixture replacing part of the cement" and "0.15~4.75 mm particle matrix strengthening and interface strengthening → 0.15~4.75 mm coarse particles replacing part of the building sand." This system reduces energy and resource consumption and, through material activation and strengthening techniques, ensures the feasibility of using pyrolysis sludge ash in cement-based materials. This invention possesses clear innovation and practical value. Summary of the Invention

[0006] To address the limited resource utilization of pyrolysis ash from oil sludge, this invention proposes a comprehensive utilization method for pyrolysis ash from oil sludge, after treatment, as a powder admixture and fine aggregate for cement-based materials, thereby expanding its resource utilization pathways.

[0007] The technical solution of this invention is as follows: (1) The pyrolysis ash residue of oil sludge is screened into particles with a particle size ≤ 0.15 mm, particles with a particle size of 0.15~4.75 mm and particles with a particle size > 4.75 mm; (2) The particles with a particle size ≤0.15 mm are subjected to the following mechanical-chemical activation treatment: The particles with a particle size ≤0.15 mm are placed in a (SM-500) ball mill, a grinding aid is added, and the mixture is ground at a speed of 36-60 r / min (preferably 48 r / min) for 5-15 minutes (preferably 10 minutes). Then, a chemical activator is sprayed in, and the grinding continues for 15-75 minutes to obtain pyrolysis ash powder of oil sludge; the mass ratio of the chemical activator to the particles ≤0.15 mm is 3~8:100; the mass ratio of the grinding aid to the particles ≤0.15 mm is 0.01~0.1:100. The chemical activator is one or more of NaOH or Na2SO4; (3) The particles with a diameter > 4.75 mm undergo the following mechanical-chemical activation treatment: the particles with a diameter > 4.75 mm are placed in a (SM-500) ball mill, a grinding aid is added, and the mill is ground at a speed of 36-60 r / min (preferably 48 r / min) for 15-30 minutes (preferably 10 minutes). Then, a chemical activator is sprayed in, and the milling continues for 15-75 minutes to obtain pyrolysis ash powder of oil sludge; the mass ratio of the chemical activator to the particles > 4.75 mm is 6~10:100; the mass ratio of the grinding aid to the particles > 4.75 mm is 0.01~0.1:100. The chemical activator is one or more of NaOH or Na2SO4 (preferably NaOH and Na2SO4, and the mass ratio of NaOH to Na2SO4 is 1:0.5~2). (4) The particles with a diameter of 0.15~4.75 mm are processed as follows: The particles with a diameter of 0.15~4.75 mm are mixed with calcium stearate, sodium dodecyl sulfate and an alkaline solution. After stirring for 10~15 minutes, the mixture is filtered to remove moisture. The particles are then dried at 60°C-70°C to obtain fine aggregate of pyrolysis sludge. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution and the particles with a diameter of 0.15~4.75 mm is 4-8:8-12:100-200:100. The alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1-2. The mass concentration of the industrial water glass solution is 20-45%, and the mass concentration of the NaOH solution is 5-40%.

[0008] Furthermore, the grinding aid is sodium stearate or polyolamine.

[0009] Furthermore, the grinding aid is added in the form of an aqueous solution of sodium stearate with a mass concentration of 0.05-5% or an aqueous solution of polyolamine with a mass concentration of 0.05-5%.

[0010] Furthermore, the chemical activator is added in the form of an aqueous solution, wherein when the chemical activator is NaOH, the mass concentration of the NaOH solution is 5-40%.

[0011] Furthermore, the chemical activator is added in the form of an aqueous solution, wherein when the chemical activator is Na2SO4, the mass concentration of the Na2SO4 solution is 5-20%.

[0012] Furthermore, the pyrolysis ash residue of the oil sludge is cleaned with an oil-soluble cleaning agent before filtration, and the oil-soluble cleaning agent is propylene glycol methyl ether, ethylene glycol butyl ether, or dipropylene glycol methyl ether.

[0013] Furthermore, the pyrolysis ash of the oil sludge is first screened to obtain particles with a diameter ≤0.15mm and particles with a diameter >0.15mm. Then, the particles with a diameter >0.15mm are washed with water until the mud content is ≤5%. After drying, they are further screened into particles with a diameter >4.75mm. The water washing is a three-stage countercurrent water washing, a wheel bucket sand washing machine, a hydrocyclone group water washing, or a flotation machine water washing.

[0014] Furthermore, the pyrolysis ash powder of the oil sludge is used to replace 1-30% of the cement mass in cement-based materials.

[0015] Furthermore, the fine aggregate of pyrolysis sludge is used to replace 1-20% of the mass of building sand in cement-based materials.

[0016] This invention uses pyrolysis ash from oil sludge as raw material. Through the mechanical-chemical synergistic activation of pyrolysis ash powder admixture and the strengthening of the fine aggregate matrix and interface of pyrolysis ash, pyrolysis ash can be used as a powder admixture to replace part of the cement, or modified to replace building sand as fine aggregate. This improves its application range and finished product performance, and has significant innovation and application value. Detailed Implementation

[0017] The present invention is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of skill in the art. The reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods or product instructions. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to the methods of this invention. The preferred embodiments and materials described herein are for illustrative purposes only.

[0019] Example 1

[0020] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in propylene glycol methyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were subjected to three-stage countercurrent water washing until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 60 r / min for 15 minutes, then spray in NaOH aqueous solution and continue grinding for 75 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 8% of the particles ≤0.15 mm, and the mass concentration of NaOH solution is 40%; the mass of sodium stearate is 0.1% of the mass of the particles ≤0.15 mm, and the mass concentration of sodium stearate aqueous solution is 5%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 60 r / min for 30 minutes, then spray in NaOH aqueous solution and continue grinding for 75 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 10% of the particles >4.75 mm, and the mass concentration of NaOH aqueous solution is 40%; the mass of sodium stearate is 0.1% of the mass of the particles >4.75 mm, and the mass concentration of sodium stearate aqueous solution is 5%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 15 minutes, filter to remove water, and dry the particles at 70°C to obtain reinforced particles with a particle size of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a particle size of 0.15~4.75 mm is 8:12:200:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:2, a mass concentration of 45% for the industrial water glass solution, and a mass concentration of 40% for the NaOH solution.

[0021] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 30% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 20% of the building sand mass.

[0022] Example 2

[0023] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in ethylene glycol butyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were washed with water in a wheel bucket sand washing machine until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, grind at 36 r / min for 5 minutes, then spray in a Na2SO4 aqueous solution and continue grinding for 15 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 3% of the particles ≤0.15 mm, and the mass concentration of the Na2SO4 aqueous solution is 5%; the mass of the polyolamine is 0.01% of the mass of the particles ≤0.15 mm, and the mass concentration of the polyolamine aqueous solution is 0.05%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 36 r / min for 15 minutes, then spray in NaOH aqueous solution and continue grinding for 15 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 6% of the particles >4.75 mm, and the mass concentration of NaOH aqueous solution is 5%; the mass of sodium stearate is 0.01% of the mass of the particles >4.75 mm, and the mass concentration of sodium stearate aqueous solution is 0.05%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 10 minutes, filter to remove water, and dry the particles at 60°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 4:12:200:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1, a mass concentration of 20% for the industrial water glass solution, and a mass concentration of 5% for the NaOH solution.

[0024] (5) Thus, steps 2 and 3 yield the oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields the oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 1% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 1% of the building sand mass.

[0025] Example 3

[0026] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in dipropylene glycol methyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were washed with water in a hydrocyclone group until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 48 r / min for 10 minutes, then spray in Na2SO4 aqueous solution and continue grinding for 30 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 5% of the particles ≤0.15 mm, and the mass concentration of Na2SO4 aqueous solution is 10%; the mass of sodium stearate is 0.01% of the mass of the particles ≤0.15 mm, and the mass concentration of sodium stearate aqueous solution is 3%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 36 r / min for 15 minutes, then spray in NaOH aqueous solution and continue grinding for 60 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 7% of the particles >4.75 mm, and the mass concentration of NaOH aqueous solution is 20%; the mass of sodium stearate is 0.05% of the mass of the particles >4.75 mm, and the mass concentration of sodium stearate aqueous solution is 4%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 10 minutes, filter to remove water, and dry the particles at 70°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 8:8:200:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1.5, a mass concentration of 25% for the industrial water glass solution, and a mass concentration of 10% for the NaOH solution.

[0027] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 30% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 1% of the building sand mass.

[0028] Example 4

[0029] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in propylene glycol methyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were washed with water by a flotation machine until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, grind at 60 r / min for 5 minutes, then spray in a NaOH aqueous solution and continue grinding for 45 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 5% of the particles ≤0.15 mm, and the mass concentration of the NaOH aqueous solution is 40%; the mass of the polyolamine is 0.05% of the mass of the particles ≤0.15 mm, and the mass concentration of the polyolamine aqueous solution is 0.5%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 48 r / min for 20 minutes, then spray in NaOH aqueous solution and continue grinding for 15 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 8% of the particles >4.75 mm, and the mass concentration of NaOH aqueous solution is 40%; the mass of sodium stearate is 0.1% of the mass of the particles >4.75 mm, and the mass concentration of sodium stearate aqueous solution is 5%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 15 minutes, filter to remove water, and dry the particles at 60°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 8:12:100:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:2, a mass concentration of 30% for the industrial water glass solution, and a mass concentration of 15% for the NaOH solution.

[0030] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 1% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 20% of the building sand mass.

[0031] Example 5

[0032] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in ethylene glycol butyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were subjected to three-stage countercurrent water washing until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 60 r / min for 10 minutes, then spray in Na2SO4 aqueous solution and continue grinding for 60 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 6% of the particles ≤0.15 mm, and the mass concentration of Na2SO4 aqueous solution is 15%; the mass of sodium stearate is 0.01% of the mass of the particles ≤0.15 mm, and the mass concentration of sodium stearate aqueous solution is 3%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 48 r / min for 25 minutes, then spray in Na2SO4 aqueous solution and continue grinding for 30 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 10% of the particles >4.75 mm, and the mass concentration of Na2SO4 aqueous solution is 5%; the mass of sodium stearate is 0.1% of the mass of the particles >4.75 mm, and the mass concentration of sodium stearate aqueous solution is 3%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 15 minutes, filter to remove water, and dry the particles at 70°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 4:8:100:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1.5, a mass concentration of 35% for the industrial water glass solution, and a mass concentration of 20% for the NaOH solution.

[0033] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 20% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 10% of the building sand mass.

[0034] Example 6

[0035] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in dipropylene glycol methyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were washed with water in a wheel bucket sand washing machine until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, and grind at 48 r / min for 5 minutes. Then spray in a mixed aqueous solution of NaOH and Na2SO4 and continue grinding for 15 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 3% of the particles ≤0.15 mm, and the mass concentration of the NaOH aqueous solution is 30%; the mass of Na2SO4 is 6% of the particles ≤0.15 mm, and the mass concentration of the Na2SO4 aqueous solution is 5%; the mass of the polyolamine is 0.07% of the mass of the particles ≤0.15 mm, and the mass concentration of the polyolamine aqueous solution is 2%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, and grind at 36 r / min for 20 minutes. Then spray in a Na2SO4 aqueous solution and continue grinding for 45 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 10% of the particles >4.75 mm, and the mass concentration of the NaOH aqueous solution is 10%. The mass of the polyolamine is 0.03% of the mass of the particles >4.75 mm, and the mass concentration of the polyolamine aqueous solution is 0.5%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 12 minutes, filter to remove water, and dry the particles at 70°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 8:10:200:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1, a mass concentration of 40% for the industrial water glass solution, and a mass concentration of 25% for the NaOH solution.

[0036] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 15% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 15% of the building sand mass.

[0037] Example 7

[0038] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in propylene glycol methyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were washed with water in a hydrocyclone group until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 48 r / min for 15 minutes, then spray in NaOH aqueous solution and continue grinding for 30 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 8% of the particles ≤0.15 mm, and the mass concentration of NaOH aqueous solution is 10%; the mass of sodium stearate is 0.05% of the mass of the particles ≤0.15 mm, and the mass concentration of sodium stearate aqueous solution is 2%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, and grind at 36 r / min for 25 minutes. Then spray in a mixed aqueous solution of NaOH and Na2SO4 and continue grinding for 60 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 6% of the particles >4.75 mm, and the mass concentration of the NaOH aqueous solution is 20%; the mass of Na2SO4 is 3% of the particles >4.75 mm, and the mass concentration of the Na2SO4 aqueous solution is 10%; the mass of the polyolamine is 0.03% of the mass of the particles >4.75 mm, and the mass concentration of the polyolamine aqueous solution is 1%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 10 minutes, filter to remove water, and dry the particles at 60°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 4:12:150:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1, a mass concentration of 45% for the industrial water glass solution, and a mass concentration of 30% for the NaOH solution.

[0039] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 10% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 20% of the building sand mass.

[0040] Example 8

[0041] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in ethylene glycol butyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were washed with water by a flotation machine until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, and grind at 36 r / min for 15 minutes. Then spray in a Na2SO4 aqueous solution and continue grinding for 45 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 7% of the particles ≤0.15 mm, and the mass concentration of the Na2SO4 aqueous solution is 20%. The mass of the polyolamine is 0.1% of the mass of the particles ≤0.15 mm, and the mass concentration of the polyolamine aqueous solution is 4%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, and grind at 60 r / min for 30 minutes. Then spray in a NaOH aqueous solution and continue grinding for 75 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 8% of the particles >4.75 mm, and the mass concentration of the NaOH aqueous solution is 40%. The mass of the polyolamine is 0.08% of the mass of the particles >4.75 mm, and the mass concentration of the polyolamine aqueous solution is 3%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 15 minutes, filter to remove water, and dry the particles at 60°C to obtain reinforced particles with a particle size of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a particle size of 0.15~4.75 mm is 8:10:150:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1.5, a mass concentration of 40% for the industrial water glass solution, and a mass concentration of 35% for the NaOH solution.

[0042] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 5% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 15% of the building sand mass.

[0043] Example 9

[0044] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in dipropylene glycol methyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were subjected to three-stage countercurrent water washing until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add sodium stearate aqueous solution, grind at 36 r / min for 10 minutes, then spray in NaOH aqueous solution and continue grinding for 60 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 8% of the particles ≤0.15 mm, and the mass concentration of NaOH aqueous solution is 15%; the mass of sodium stearate is 0.1% of the mass of the particles ≤0.15 mm, and the mass concentration of sodium stearate aqueous solution is 5%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add an aqueous solution of polyolamine, and grind at 60 r / min for 15 minutes. Then spray in an aqueous solution of Na2SO4 and continue grinding for 75 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 6% of the particles >4.75 mm, and the mass concentration of the Na2SO4 aqueous solution is 15%. The mass of the polyolamine is 0.1% of the mass of the particles >4.75 mm, and the mass concentration of the polyolamine aqueous solution is 4%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 10 minutes, filter to remove water, and dry the particles at 70°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 8:10:200:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:2, a mass concentration of 35% for the industrial water glass solution, and a mass concentration of 40% for the NaOH solution.

[0045] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 30% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 10% of the building sand mass.

[0046] Example 10

[0047] A cement-based material admixture based on pyrolysis sludge and its preparation method, comprising the following steps: (1) The pyrolysis ash residue of oil sludge was soaked in ethylene glycol butyl ether and allowed to stand for 24 hours, then filtered through a 0.015 mm sieve. Subsequently, the remaining pyrolysis ash residue of oil sludge was dried (in a hot air circulating oven at 100-110℃) (mass change rate ≤0.1% / h); particles ≤0.15 mm and particles >0.15 mm were obtained by sieving; the coarse particles >0.15 mm were subjected to three-stage countercurrent water washing until the mud content was ≤5%, and dried (in a hot air circulating oven at 105±5℃) (mass change rate ≤0.1% / h); the dried particles were further sieved into particles of 0.15~4.75 mm and >4.75 mm. (2) Place particles ≤0.15 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, grind at 60 r / min for 15 minutes, then spray in a NaOH aqueous solution and continue grinding for 75 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of NaOH is 8% of the particles ≤0.15 mm, and the mass concentration of the NaOH aqueous solution is 30%; the mass of the polyolamine is 0.1% of the mass of the particles ≤0.15 mm, and the mass concentration of the polyolamine aqueous solution is 5%. (3) Place particles >4.75 mm in a (SM-500) ball mill, add a polyolamine aqueous solution, and grind at 60 r / min for 25 minutes. Then spray in a Na2SO4 aqueous solution and continue grinding for 75 minutes to obtain activated particles with a particle size ≤0.15 mm. The mass of Na2SO4 is 8% of the particles >4.75 mm, and the mass concentration of the Na2SO4 aqueous solution is 20%. The mass of the polyolamine is 0.08% of the mass of the particles >4.75 mm, and the mass concentration of the polyolamine aqueous solution is 5%. (4) Place 0.15~4.75 mm particles, calcium stearate, and sodium dodecyl sulfate in an alkaline solution, stir for 15 minutes, filter to remove water, and dry the particles at 70°C to obtain reinforced particles with a diameter of 0.15~4.75 mm. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution, and the particles with a diameter of 0.15~4.75 mm is 6:12:200:100; the alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:2, a mass concentration of 25% for the industrial water glass solution, and a mass concentration of 40% for the NaOH solution.

[0048] (5) Thus, steps 2 and 3 yield oil sludge pyrolysis ash powder admixture (activated particles with a particle size ≤ 0.15 mm) and step 4 yields oil sludge pyrolysis ash fine aggregate of 0.15~4.75 mm (reinforced particles with a particle size of 0.15~4.75 mm). The activated particles with a particle size ≤ 0.15 mm and the reinforced particles with a particle size of 0.15~4.75 mm are used as raw materials to prepare building mortar. The activated particles with a particle size ≤ 0.15 mm replace cement in the building mortar, with a replacement amount of 25% of the cement mass. The reinforced particles with a particle size of 0.15~4.75 mm replace building sand in the building mortar, with a replacement amount of 5% of the building sand mass.

[0049] Cement mortar was prepared using the obtained pyrolysis sludge ash powder admixture and 0.15~4.75 mm fine aggregate from the pyrolysis sludge as raw materials, respectively replacing a portion of cement and standard sand. The 28-day compressive strength of the mortar was tested. The testing method followed GB / T17671. The cement used was P·O42.5 cement, whose performance conformed to standard GB 175-2023. The standard sand was Chinese ISO standard sand. The pyrolysis sludge ash powder admixture was also compared with commonly used mineral admixtures, fly ash and slag. The fly ash was Grade II fly ash, and the slag was S95 slag, both of which are the most commonly used mineral admixtures in actual engineering, and their performance conformed to standard GB / T 51003.

[0050] The test results are shown in Table 1 below. Specimen 1 is standard mortar; specimens 2 and 3 are standard mortars in which fly ash and slag replaced 30% of cement, respectively; specimen 4 is standard mortar in which the oil sludge pyrolysis ash powder admixture prepared in Example 1 replaced 30% of cement; specimen 5 is cement mortar in which 0.15~4.75 mm fine aggregate of oil sludge pyrolysis ash prepared in Example 1 replaced 20% of standard sand; and specimens 6~15 are cement mortars in which the oil sludge pyrolysis ash powder admixture and 0.15~4.75 mm fine aggregate of oil sludge pyrolysis ash prepared in Examples 1~10 simultaneously replaced part of cement and standard sand, respectively.

[0051] Table 1

[0052] The test results of specimens 1-4 show that when the content of pyrolysis sludge powder admixture, fly ash, and slag is 30%, the strength of the pyrolysis sludge powder admixture-cement mortar is slightly higher than that of fly ash-cement mortar, but lower than that of slag-cement mortar. Overall, the activity index of the pyrolysis sludge powder admixture is higher than 0.7, meeting the requirements for the activity index of mineral admixtures in standard GB / T 51003. Comparing the test results of specimens 1 and 5, it can be seen that when 0.15~4.75 mm fine aggregate from pyrolysis sludge replaces 20% of the standard sand, the 28-day strength of the cement mortar also decreases slightly. However, when the standard sand replacement rate is 20%, the 28-day compressive strength of the cement mortar is similar to that when pyrolysis sludge powder admixture replaces 30% of the cement (Specimens 4 and 5, 39.1 MPa and 40.21 MPa, respectively). The test results of specimens 6-15 show that when the pyrolysis ash powder of oily mud replaces 1%-30% of cement and the 0.15-4.75 mm fine aggregate of oily mud pyrolysis ash replaces 1%-20% of standard sand, the 28-day compressive strength of cement mortar is about 37.3 MPa-44.3 MPa, which is more than 70% of the 28-day compressive strength of standard mortar (specimen 1), and can be practically used in various construction projects.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for treating pyrolysis ash residue of oil sludge, characterized in that, The processing method is as follows: (1) The pyrolysis ash residue of oil sludge is screened into particles with a particle size ≤ 0.15 mm, particles with a particle size of 0.15~4.75 mm and particles with a particle size > 4.75 mm; (2) The particles with a particle size ≤0.15 mm are subjected to the following mechanical-chemical activation treatment: The particles with a particle size ≤0.15 mm are placed in a ball mill, a grinding aid is added, and the mixture is ground at a speed of 36-60 r / min for 5-15 minutes. Then, a chemical activator is sprayed in, and the mixture is ground for another 15-75 minutes to obtain pyrolysis ash powder of oil sludge. The mass ratio of the chemical activator to the particles ≤0.15 mm is 3~8:100; the mass ratio of the grinding aid to the particles ≤0.15 mm is 0.01~0.1:

100. The chemical activator is one or more of NaOH or Na2SO4. (3) The particles with a diameter > 4.75 mm undergo the following mechanical-chemical activation treatment: the particles with a diameter > 4.75 mm are placed in a ball mill, a grinding aid is added, and the mixture is ground at a speed of 36-60 r / min for 15-30 minutes. Then, a chemical activator is sprayed in, and the mixture is ground for another 15-75 minutes to obtain pyrolysis ash powder of oil sludge. The mass ratio of the chemical activator to the particles > 4.75 mm is 6-10:100; the mass ratio of the grinding aid to the particles > 4.75 mm is 0.01-0.1:

100. The chemical activator is one or more of NaOH or Na2SO4. (4) The particles with a diameter of 0.15~4.75 mm are processed as follows: The particles with a diameter of 0.15~4.75 mm are mixed with calcium stearate, sodium dodecyl sulfate and an alkaline solution. After stirring for 10~15 minutes, the mixture is filtered to remove moisture. The particles are then dried at 60°C-70°C to obtain fine aggregate of pyrolysis sludge. The mass ratio of calcium stearate, sodium dodecyl sulfate, alkaline solution and the particles with a diameter of 0.15~4.75 mm is 4-8:8-12:100-200:

100. The alkaline solution is a mixture of industrial water glass solution and NaOH solution, with a mass ratio of industrial water glass solution to NaOH solution of 1:1-2. The mass concentration of the industrial water glass solution is 20-45%, and the mass concentration of the NaOH solution is 5-40%.

2. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The grinding aid is sodium stearate or polyolamine.

3. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The grinding aid is added in the form of an aqueous solution of sodium stearate with a mass concentration of 0.05-5% or an aqueous solution of polyolamine with a mass concentration of 0.05-5%.

4. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The chemical activator is added in the form of an aqueous solution, wherein when the chemical activator is NaOH, the mass concentration of the NaOH solution is 5-40%.

5. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The chemical activator is added in the form of an aqueous solution, wherein when the chemical activator is Na2SO4, the mass concentration of the Na2SO4 solution is 5-20%.

6. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The pyrolysis ash residue of the oil sludge is cleaned with an oil-soluble cleaning agent before filtration. The oil-soluble cleaning agent is propylene glycol methyl ether, ethylene glycol butyl ether, or dipropylene glycol methyl ether.

7. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The oil sludge pyrolysis ash is first screened to obtain particles with a diameter ≤0.15mm and particles with a diameter >0.15mm. Then, the particles with a diameter >0.15mm are washed with water until the mud content is ≤5%. After drying, they are further screened into particles with a diameter >4.75mm. The water washing is a three-stage countercurrent water washing, a wheel bucket sand washing machine, a hydrocyclone group water washing, or a flotation machine water washing.

8. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The aforementioned pyrolysis ash powder is used to replace 1-30% of the cement mass in cement-based materials.

9. The method for treating pyrolysis ash residue of oil sludge as described in claim 1, characterized in that, The fine aggregate of pyrolysis sludge is used to replace 1-20% of the mass of building sand in cement-based materials.

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