CN108658515B - Preparation method of controllable low-strength material - Google Patents

Preparation method of controllable low-strength material Download PDF

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Publication number
CN108658515B
CN108658515B CN201810491748.4A CN201810491748A CN108658515B CN 108658515 B CN108658515 B CN 108658515B CN 201810491748 A CN201810491748 A CN 201810491748A CN 108658515 B CN108658515 B CN 108658515B
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strength material
controllable low
sludge
petrochemical sludge
petrochemical
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CN201810491748.4A
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CN108658515A (en
Inventor
张骏
夏兰生
陈鑫
杨力
张磊
李营
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Sinopec Engineering Group Co Ltd
Sinopec Ningbo Engineering Co Ltd
Sinopec Ningbo Technology Research Institute
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Sinopec Engineering Group Co Ltd
Sinopec Ningbo Engineering Co Ltd
Sinopec Ningbo Technology Research Institute
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a preparation method of a controllable low-strength material, which comprises the steps of smashing petrochemical sludge, placing the smashed petrochemical sludge in an electric arc plasma generator, reacting at a high temperature, collecting residues after reaction, and mixing the residues with the petrochemical sludge and cement to obtain the controllable low-strength material. The invention discloses a preparation method of a controllable low-strength material, which utilizes the reaction characteristic of plasma to react and gasify organic matters and oil substances in petrochemical sludge, collects gasified residues as one of raw materials of the controllable low-strength material, establishes a new coupling circulation process for partially replacing the raw materials for producing the controllable low-strength material with the gasified residues after deep dehydration of the petrochemical sludge and plasma reaction of the petrochemical sludge, can prepare the controllable low-strength material by utilizing the petrochemical sludge in combination with cement and the residues, can treat the petrochemical sludge, achieves two purposes, and realizes harmless and resource utilization of the petrochemical sludge in the production process of the controllable low-strength material.

Description

Preparation method of controllable low-strength material
Technical Field
The invention belongs to the technical field of environmental engineering, and particularly relates to a preparation method of a controllable low-strength material.
Background
In the sewage treatment process of chemical plants and oil refineries, oil sludge produced by an oil separation tank, scum produced by a flotation tank, residual activated sludge produced by a biochemical tank and tank bottom oil sludge produced by structures such as a sewage adjusting tank, a sump oil tank, a flocculation sedimentation tank and the like are referred to as three sludge for short, the three sludge belongs to petrochemical sludge, and the three sludge contains oil, phenol, COD (chemical oxygen demand), sulfide and other pollutants and cannot be directly discharged into the environment. The petrochemical sludge is easy to stink in the sedimentation tank, has high water content and is difficult to dehydrate, and is a main object for treating the petrochemical sludge.
Foreign treatment methods for petrochemical sludge are mostly landfilled before the eighties of the last century, and terminal treatment is not performed, and related laws and regulations begin to be issued in the eighties, and terminal treatment for petrochemical sludge is gradually performed until the ninety years. At present, the domestic and foreign treatment methods for petrochemical sludge mainly comprise: incinerating (after separation, preparation and dehydration); thermal desorption, which comprises high-temperature treatment and low-temperature thermochemical conversion of oily sludge; a solvent extraction treatment process; wet air oxidation of sludge; biological treatment of sludge; the product is reused as a raw material or quenching liquid of a coking device; the oil slurry is reused as the oil slurry of the fractionating tower of the catalytic cracking unit; the sludge fuel process includes anaerobic sludge fermentation to produce marsh gas, heating to generate electricity, dewatering and synthesizing fuel. The burning method has the outstanding characteristics that: the volume and the weight of the sludge can be greatly reduced, all pathogens are killed, the sludge treatment speed is high, long-term storage is not needed, the sludge can be incinerated on the spot, long-distance transportation is not needed, and the energy can be recovered for power generation, heat supply and the like, so that the method is a domestic popular petrochemical sludge treatment method. However, the burning method has the disadvantages of great consumption and great smoke emission, and what is more important, the recovery of the heat energy of the oil residues is not realized, so that the waste of resources is caused.
The controllable low-strength material (CLSM) is a cement-based low-strength backfill material replacing the traditional backfill material, and the 28d unconfined compressive strength of the controllable low-strength material cannot exceed 8.3 MPa.
The inventor of the application finds that petrochemical sludge can be used as raw materials and raw material sources for producing CLSM materials in the research process, so that the harmless and resource utilization of the petrochemical sludge is realized, and the prepared CLSM material has low unconfined compressive strength and is easy to backfill and construct. In view of this, the present invention provides a method for preparing a controllable low-strength material.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a controllable low-strength material aiming at the defects of the prior art, which can not only utilize petrochemical sludge to combine cement and residues to prepare the controllable low-strength material, but also treat the petrochemical sludge, achieves two purposes, and realizes harmless and resource utilization of the petrochemical sludge in the production process of the controllable low-strength material.
The technical scheme adopted by the invention for solving the technical problems is as follows: a controllable low-strength material is prepared through breaking the petrochemical sludge, putting it in arc plasma generator, reaction at high temp, collecting the residual dregs, and mixing it with petrochemical sludge and cement.
Preferably, the reaction temperature in the arc plasma generator is 5000 to 10000K.
Furthermore, the reaction time in the arc plasma generator is 13-32 s.
Preferably, in the controllable low-strength material, the mass ratio of the petrochemical sludge, the residues and the cement is 1: 0.4-3.2: 0.8-4.
Preferably, the water content of the petrochemical sludge placed in the arc plasma generator and the water content of the petrochemical sludge mixed with the residue and the cement are 60-85%.
Preferably, after the reaction in the arc plasma generator, 0.03-0.2 g of residue is generated per gram of dry petrochemical sludge.
Compared with the prior art, the invention has the following advantages: the invention discloses a preparation method of a controllable low-strength material, which utilizes the reaction characteristic of plasma to react and gasify organic matters and oil substances in petrochemical sludge, collects gasified residues as one of raw materials of the controllable low-strength material, establishes a new coupling circulation process for partially replacing the raw materials for producing the controllable low-strength material with the gasified residues after deep dehydration of the petrochemical sludge and plasma reaction of the petrochemical sludge, can prepare the controllable low-strength material by utilizing the petrochemical sludge in combination with cement and the residues, can treat the petrochemical sludge, achieves two purposes, and realizes harmless and resource utilization of the petrochemical sludge in the production process of the controllable low-strength material. The prepared controllable low-strength material is added with a proper amount of water for construction, after 28 days of maintenance, the tensile strength of the material reaches 3.5-7.6 MPa, and the material can be used for the structural backfill of various municipal public pipe ditches such as electric power, telecommunication, water supply and drainage, oil and gas pipelines and the like, the backfill in highway engineering and the like.
Drawings
FIG. 1 is a histogram of unconfined compressive strength of the material after curing for 28d versus the mix ratio of the material.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Taking 1000g of petrochemical sludge, smashing, placing in an arc plasma generator, reacting for 13-32 s at the temperature of 5000-10000K, collecting 56g of reacted residues, and preparing a plurality of petrochemical sludge and cement for later use.
The cement used in the examples is 42.5 type high performance sulphoaluminate cement, which comprises the following main oxides: 3.6 wt.% SiO2、38.5wt.％CaO、35.6wt.％Al2O3And 1.6 wt.% Fe2O3。
The residue of the petrochemical sludge after plasma treatment used in the examples comprises the following main oxides: 0.9 wt.% Na2O、2.14wt.％MgO、10.90wt.％Al2O3、17.90wt.％SiO2、29.40wt.％CaO、16.00wt.％Fe2O3And others.
Example 1: mixing the petrochemical sludge, the residues and the cement according to the mass ratio of 1:3.2:0.8 to obtain a controllable low-strength material; and uniformly stirring the controllable low-strength material, putting the material into a mould, adding a proper amount of water to immerse the controllable low-strength material into the water, maintaining for 28 days, and testing that the unconfined compressive strength of the controllable low-strength material after 28d is 3.5 MPa.
Example 2: mixing the petrochemical sludge, the residues and the cement according to the mass ratio of 1:2.4:1.6 to obtain a controllable low-strength material; and uniformly stirring the controllable low-strength material, putting the material into a mould, adding a proper amount of water to immerse the controllable low-strength material into the water, maintaining for 28 days, and testing that the unconfined compressive strength of the controllable low-strength material after 28d is 3.9 MPa.
Example 3: mixing the petrochemical sludge, the residues and the cement according to the mass ratio of 1:1.6:2.4 to obtain a controllable low-strength material; and uniformly stirring the controllable low-strength material, putting the material into a mould, adding a proper amount of water to immerse the controllable low-strength material into the water, maintaining for 28 days, and testing that the unconfined compressive strength of the controllable low-strength material after 28d is 6.6 MPa.
Example 4: mixing the petrochemical sludge, the residues and the cement according to the mass ratio of 1:0.8:3.2 to obtain a controllable low-strength material; and uniformly stirring the controllable low-strength material, putting the material into a mould, adding a proper amount of water to immerse the controllable low-strength material into the water, maintaining for 28 days, and testing the unconfined compressive strength of 28d to be 7.0 MPa.
Example 5: mixing the petrochemical sludge, the residues and the cement according to the mass ratio of 1:0.4:3.6 to obtain a controllable low-strength material; and uniformly stirring the controllable low-strength material, putting the material into a mould, adding a proper amount of water to immerse the controllable low-strength material into the water, maintaining for 28 days, and testing the unconfined compressive strength of 28d to be 7.6 MPa.
Comparative example 1: uniformly mixing the petrochemical sludge and the cement in a mass ratio of 1:4, putting the mixture into a mold, adding water for immersion, maintaining for 28 days, and testing that the unconfined compressive strength of 28d is 9.0 MPa.
In examples 1 to 5 and comparative example 1, the histogram of the relationship between the unconfined compressive strength of the material after curing for 28d and the compounding ratio of the material is shown in fig. 1. As can be seen from the figure 1, the residue of the petrochemical sludge after plasma treatment is beneficial to reducing the unconfined compressive strength of the controllable low-strength material, and ensures that the controllable low-strength material meets the use requirement of a backfill material.

Claims (4)

1. A preparation method of a controllable low-strength material is characterized in that petrochemical sludge is smashed and then placed in an electric arc plasma generator, the reaction temperature in the electric arc plasma generator is 5000-10000K, after reaction at a high temperature, residues after reaction are collected, and the residues are mixed with the petrochemical sludge and cement to obtain the controllable low-strength material; in the controllable low-strength material, the mass ratio of petrochemical sludge, residues and cement is 1: 0.4-3.2: 0.8-4.
2. The method of claim 1, wherein the reaction time in the arc plasma generator is 13-32 s.
3. The method of claim 1, wherein the moisture content of the petrochemical sludge disposed in the arc plasma generator and the moisture content of the petrochemical sludge mixed with the sludge and the cement are 60-85%.
4. The method of claim 1, wherein the amount of the residue produced per gram of the dry petrochemical sludge is 0.03-0.2 g after the reaction in the arc plasma generator.
CN201810491748.4A 2018-05-22 2018-05-22 Preparation method of controllable low-strength material Active CN108658515B (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101134632A (en) * 2006-08-28 2008-03-05 扬州石油化工厂 Process for disposal of oil-containing sludge

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101134632A (en) * 2006-08-28 2008-03-05 扬州石油化工厂 Process for disposal of oil-containing sludge

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
含油污泥处理技术综述;张贞浴;《山东工业技术》;20161231;第18页 *
等离子体火炬含油污泥、工业污泥焚烧处理技术方案;无忧固废网;《搜狐》;20180508;第1-6页 *

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