CN113003960A - Sand washing mud calcining mode and application thereof - Google Patents

Sand washing mud calcining mode and application thereof Download PDF

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Publication number
CN113003960A
CN113003960A CN202110242952.4A CN202110242952A CN113003960A CN 113003960 A CN113003960 A CN 113003960A CN 202110242952 A CN202110242952 A CN 202110242952A CN 113003960 A CN113003960 A CN 113003960A
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Prior art keywords
powder
mud
temperature
sand washing
washing mud
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CN202110242952.4A
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Chinese (zh)
Inventor
曾利群
金国亮
金欣
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Shanghai Tesai High Temperature Technology Co ltd
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Shanghai Tesai High Temperature Technology Co ltd
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Priority to CN202110242952.4A priority Critical patent/CN113003960A/en
Publication of CN113003960A publication Critical patent/CN113003960A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/434—Preheating with addition of fuel, e.g. calcining
    • 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
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
    • C04B7/47—Cooling ; Waste heat management
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention discloses a sand washing mud calcining mode and application thereof, comprising a material preparation process and a thermal process, wherein the thermal process comprises the following specific steps: (1) strong heat: placing the powder in a calcining kiln, and heating while stirring; (2) and (3) constant temperature: calcining the powder at constant temperature; (3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling; (4) packaging: and packaging the powder after the temperature of the powder is reduced. According to the invention, by controlling the heating rate in the heating process and the temperature of the cooling package, the dissociation degree of mineral molecule lattices in the sand washing mud is improved, the granularity after calcination is refined, the amount of absorbed moisture in the cooling process is reduced, and the activity of mineral molecules is improved. The sand washing mud prepared by the method replaces part of cement to prepare cement mortar, and has good breaking strength and compressive strength.

Description

Sand washing mud calcining mode and application thereof
Technical Field
The invention relates to the technical field of calcination processes, in particular to a sand washing mud calcination method and application thereof.
Background
The sand washing mud is engineering slag soil of an ore field, and the main components of the sand washing mud are weathered kaolinite, granite ore and the like, and are accompanied by organic components such as other minerals, biological remains such as animals and plants, decayed substances and the like. The sand washing mud is generally treated as waste in the building industry, and a large amount of accumulated sand washing mud is flushed by rainwater and flows to a river channel to cause river channel blockage and even cause natural disasters such as 'debris flow'.
At present, the sand washing mud is recycled mainly for making bricks or producing foamed ceramic insulation boards and the like. However, the sand washing mud for making bricks or producing foamed ceramic insulation boards has strict physical and chemical index limitations, and is limited in use amount and not beneficial to popularization and application. The chinese patent document AN112174558A discloses a method for preparing AN active mineral admixture by using washed sand mud, and the admixture prepared by the washed sand mud can be used as a substitute for cement, but the mineral activity of the admixture prepared by the method still needs to be improved.
Disclosure of Invention
In order to solve the above problems, the first aspect of the present invention provides a sand washing mud calcining method, comprising the steps of:
s1 material preparation:
(1) removing impurities such as fine particles, plant fibers, iron and manganese and the like from the sand washing mud;
(2) filter-pressing into mud cakes with water content of about 30 wt% or spray-drying into powder with water content of less than or equal to 6.0 wt%;
(3) drying the mud cake, crushing after the water content is less than or equal to 6.0 wt%, sieving with a 200-mesh sieve to prepare powder, and performing spray drying to prepare powder without crushing;
s2 thermal process:
(1) strong heat: placing the powder in a calcining kiln, and heating while stirring;
(2) and (3) constant temperature: calcining the powder at constant temperature;
(3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling;
(4) packaging: and packaging the powder after the temperature of the powder is reduced.
Further, the main minerals of the sand washing mud are composed of one or more of montmorillonite, diatom mineral, kaolinite, perlite and muscovite.
Further, the main minerals of the sand wash mud consist of montmorillonite and/or diatom minerals.
Further, the temperature rise rate of the heating process in the strong heating step is not lower than 10 ℃/s.
Further, the temperature rise time of the heating process in the strong heating step is 75-85 min.
Further, the time for temperature maintenance in the constant temperature step is 150-.
Further, the cooling rate of the cooling process in the forced cooling step is not lower than 5-8 ℃/s.
Further, the temperature of the packaging step is less than 150 ℃.
Further, the temperature of the packaging step is 110-150 ℃.
The second aspect of the invention provides application of the sand washing mud, which can be applied to the fields of building materials, ceramics, petrochemical industry, grinding wheels and the like.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by controlling the heating rate in the heating process, the dissociation degree of mineral molecule lattices in the sand washing mud is improved, the granularity after calcination is refined, and the mineral molecule activity is improved. The invention packs the sand washing mud at a higher temperature, which is beneficial to reducing the water absorption of the sand washing mud in the cooling process and improving the mineral molecule activity. The sand washing mud prepared by the method replaces part of cement to prepare cement mortar, and has good breaking strength and compressive strength.
Detailed Description
In order to solve the above problems, the first aspect of the present invention provides a sand washing mud calcining method, comprising the steps of:
s1 material preparation:
(1) removing impurities such as fine particles, plant fibers, iron and manganese and the like from the sand washing mud;
(2) filter-pressing into mud cakes with water content of about 30 wt% or spray-drying into powder with water content of less than or equal to 6.0 wt%;
(3) drying the mud cake, crushing after the water content is less than or equal to 6.0 wt%, sieving with a 200-mesh sieve to prepare powder, and performing spray drying to prepare powder without crushing;
s2 thermal process:
(1) strong heat: placing the powder in a calcining kiln, and heating while stirring;
(2) and (3) constant temperature: calcining the powder at constant temperature;
(3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling;
(4) packaging: and packaging the powder after the temperature of the powder is reduced.
Further, the main minerals of the sand washing mud are composed of one or more of montmorillonite, diatom mineral, kaolinite, perlite and muscovite.
Further, the main minerals of the sand wash mud consist of montmorillonite and/or diatom minerals.
Further, the collection place of the sand washing mud containing the montmorillonite minerals is a Hunan Hengyang sand field, and the main chemical component is Al2O3(30-38wt％)、SiO2(40-53wt％)、MgO、K2O、Fe2O3And the like.
Further, the collection place of the sand washing mud containing the diatom minerals is a Guangdong Shenzhen quarry, and the main chemical component is Al2O3(18-27wt％)、SiO2(50-70wt％)、K2O、Fe2O3、CaO、Na2O, and the like.
The minerals composing the sand washing mud have the main chemical component Al2O3And SiO2And the like, and also contains impurities such as moisture, a small amount of hydrocarbon compounds, sulfur oxides, phosphorus oxides and the like, and the existence of the impurities can reduce the main chemical component Al of the sand washing mud2O3And SiO2Activity of (2).
Moisture is usually present in minerals in the form of adsorbed, bound, structured, and crystallized water. The adsorbed water is gasified and volatilized when the temperature of the mineral is heated to 110 ℃ of 100-. The presence of this moisture reduces the activity of the mineral molecules.
The hydrocarbon compounds can form a layer of film-like substances on the surface of the mineral molecules, and the activity of the mineral molecules is reduced. The sulfur oxide and phosphorus oxide react with water vapor in the mineral dehydration process to produce sulfuric acid and phosphoric acid, and acidize Al2O3Etc. major components are addedThe activity of mineral molecules is reduced in one step.
Further, the temperature rise rate of the heating process in the strong heating step is not lower than 10 ℃/s.
Further, the temperature rise time of the heating process in the strong heating step is 75-85 min.
During the temperature rise process of the sand washing mud, substances such as water, hydrocarbon compounds, sulfur oxides, phosphorus oxides and the like attached to the surfaces of mineral molecules or bonded with mineral crystals are gasified, the volume expansion and the pressure rise, and the rapidly raised temperature can cause the rapid volume expansion of the substances such as water, hydrocarbon compounds, sulfur oxides, phosphorus oxides and the like, so that the impact is caused on the structure of the mineral molecules, the dissociation of the crystal lattices of the mineral molecules and the refinement of the mineral particles are facilitated, and the activity of the calcined sand washing mud is improved.
Further, the temperature in the constant temperature step is maintained at 750-850 ℃.
Further, the time for temperature maintenance in the constant temperature step is 150-.
Further, the cooling rate of the cooling process in the forced cooling step is not lower than 5-8 ℃/s.
Further, the cooling rate of the cooling process in the forced cooling step is not lower than 8 ℃/s.
Further, the temperature of the packaging step is less than 150 ℃.
Further, the temperature of the packaging step is 110-150 ℃.
The applicant finds that the cooling rate of the sand washing mud after calcination is not lower than 8 ℃/s, and the temperature of the sand washing mud after cooling is not lower than 110 ℃ for encapsulation, so that the prepared sand washing mud has good activity. The applicant speculates that the possible reasons are that mineral molecules in the calcined sand washing mud contain a large amount of-Al-O-bonds, -Si-O-bonds and the like, -Al-O-bonds and-Si-O-bonds, which absorb moisture in the air during the cooling process of the sand washing mud, form adsorbed water, combined water, structural water and crystal water again, reduce the activity of the mineral molecules, and maintain higher temperature for a long time, and the-Al-O-bonds and the-Si-O-bonds can be bonded by themselves, so that the activity of the mineral molecules is reduced.
The second aspect of the invention provides application of the sand washing mud, which can be applied to the fields of building materials, ceramics, petrochemical industry, grinding wheels and the like.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Example 1
Provides a sand washing mud calcining method, which comprises the following steps:
s1 material preparation:
(1) removing impurities such as fine particles, plant fibers, iron and manganese and the like from the sand washing mud containing diatomite minerals;
(2) filter-pressing into mud cakes with water content of about 30 wt% or spray-drying into powder with water content of less than or equal to 6.0 wt%;
(3) drying the mud cake, crushing after the water content is less than or equal to 6.0 wt%, sieving with a 200-mesh sieve to prepare powder, and performing spray drying to prepare powder without crushing;
s2 thermal process:
(1) strong heat: placing the powder in a calcining kiln, heating while stirring, and heating the powder to 750 ℃ at a heating rate of 10 ℃/min;
(2) and (3) constant temperature: controlling the temperature at 750 ℃, and calcining for 180 min;
(3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling, and cooling the powder at a cooling rate of 8 ℃/s;
(4) packaging: when the temperature of the powder is reduced to 150 ℃, the powder can be put into a packaging barrel for packaging.
Wherein, in the sand washing mud containing diatomite minerals, the main chemical component Al of diatomite2O3Is 25.86 wt% SiO2The content of (B) was 52.2 wt%.
Also provides application of the sand washing mud prepared by the sand washing mud calcining method in the field of buildings.
Example 2
Provides a sand washing mud calcining method, which comprises the following steps:
s1 material preparation:
(1) removing impurities such as fine particles, plant fibers, iron and manganese and the like from the sand washing mud containing diatomite minerals;
(2) filter-pressing into mud cakes with water content of about 30 wt% or spray-drying into powder with water content of less than or equal to 6.0 wt%;
(3) drying the mud cake, crushing after the water content is less than or equal to 6.0 wt%, sieving with a 200-mesh sieve to prepare powder, and performing spray drying to prepare powder without crushing;
s2 thermal process:
(1) strong heat: placing the powder in a calcining kiln, heating while stirring, and heating the powder to 750 ℃ at a heating rate of 15 ℃/min;
(2) and (3) constant temperature: controlling the temperature at 750 ℃, and calcining for 180 min;
(3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling, and cooling the powder at a cooling rate of 8 ℃/s;
(4) packaging: when the temperature of the powder is reduced to 130 ℃, the powder can be put into a packaging barrel for packaging.
Wherein, in the sand washing mud containing diatomite minerals, the main chemical component Al of diatomite2O3Is 25.86 wt% SiO2The content of (B) was 52.2 wt%.
Also provides application of the sand washing mud prepared by the sand washing mud calcining method in the field of buildings.
Example 3
Provides a sand washing mud calcining method, which comprises the following steps:
s1 material preparation:
(1) removing impurities such as fine particles, plant fibers, iron and manganese and the like from the sand washing mud containing the montmorillonite;
(2) filter-pressing into mud cakes with water content of about 30 wt% or spray-drying into powder with water content of less than or equal to 6.0 wt%;
(3) drying the mud cake, crushing after the water content is less than or equal to 6.0 wt%, sieving with a 200-mesh sieve to prepare powder, and performing spray drying to prepare powder without crushing;
s2 thermal process:
(1) strong heat: placing the powder in a calcining kiln, heating while stirring, and heating the powder to 850 ℃ at the heating rate of 15 ℃/min;
(2) and (3) constant temperature: controlling the temperature at 850 ℃, and calcining for 160 min;
(3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling, and cooling the powder at a cooling rate of 8 ℃/s;
(4) packaging: when the temperature of the powder is reduced to 110 ℃, the powder can be put into a packaging barrel for packaging.
Wherein, in the sand washing mud containing montmorillonite, the main chemical component Al of montmorillonite2O3Has a content of 32.91 wt% and SiO2The content of (B) was 46.4 wt%.
Also provides application of the sand washing mud prepared by the sand washing mud calcining method in the field of buildings.
Comparative example 1
Provides a calcination mode of the sand washing mud and also provides application of the sand washing mud prepared by the calcination mode of the sand washing mud in the field of buildings. The sand washing mud and the specific calcining mode thereof are the same as the embodiment 1, except that the temperature of the powder in the comparative example 1 is reduced to 25 ℃, and the packaging is carried out.
Comparative example 2
Provides a calcination mode of the sand washing mud and also provides application of the sand washing mud prepared by the calcination mode of the sand washing mud in the field of buildings. The sand washing mud and the specific calcining mode thereof are the same as the embodiment 1, except that the temperature of the powder in the comparative example 2 is reduced to 80 ℃, and the packaging is carried out.
Comparative example 3
Provides a calcination mode of the sand washing mud and also provides application of the sand washing mud prepared by the calcination mode of the sand washing mud in the field of buildings. The sand washing mud and the specific calcining mode thereof are the same as the embodiment 1, and the difference is that the temperature reduction rate of the powder of the comparative example 3 is 5 ℃/s.
Comparative example 4
Provides a calcination mode of the sand washing mud and also provides application of the sand washing mud prepared by the calcination mode of the sand washing mud in the field of buildings. The difference between the sand washing mud and the specific calcining mode is that the temperature of the powder in the comparative example 4 is reduced to 80 ℃ and the powder is packaged, wherein the temperature reduction rate is 5 ℃/s.
Comparative example 5
Provides a calcination mode of the sand washing mud and also provides application of the sand washing mud prepared by the calcination mode of the sand washing mud in the field of buildings. The sand washing mud and the specific calcining mode thereof are the same as the embodiment 1, and the difference is that the temperature rising rate of the powder of the comparative example 5 is 5 ℃/min.
Performance testing
The sand-washing mud obtained in examples and comparative examples was used as an additive in place of 12 wt% of cement to prepare cement mortar, and the flexural strength and compressive strength were measured with the cement mortar without the sand-washing mud (hereinafter referred to as "control"). The test data are recorded in table 1.
TABLE 1
Figure BDA0002962962490000071

Claims (10)

1. A sand washing mud calcining method is characterized by comprising the following steps:
s1 material preparation:
(1) removing impurities such as fine particles, plant fibers, iron and manganese and the like from the sand washing mud;
(2) filter-pressing into mud cakes with water content of about 30 wt% or spray-drying into powder with water content of less than or equal to 6.0 wt%;
(3) drying the mud cake, crushing after the water content is less than or equal to 6.0 wt%, sieving with a 200-mesh sieve to prepare powder, and performing spray drying to prepare powder without crushing;
s2 thermal process:
(1) strong heat: placing the powder in a calcining kiln, and heating while stirring;
(2) and (3) constant temperature: calcining the powder at constant temperature;
(3) forced cooling: pouring the calcined high-temperature powder into a cooler for cooling;
(4) packaging: and packaging the powder after the temperature of the powder is reduced.
2. The calcination of sand washing mud as claimed in claim 1, wherein the main mineral of the sand washing mud is composed of one or more of montmorillonite, diatom mineral, kaolinite, perlite and muscovite.
3. The washed sand mud calcination process according to claim 2, wherein the washed sand mud is comprised of a montmorillonite and/or diatom mineral as the main mineral.
4. The washed-out mud calcination mode as claimed in claim 1, wherein the heating rate of the heating process in the intense heat step is not lower than 10 ℃/s.
5. The washed-out mud calcination mode as claimed in claim 1, wherein the temperature rise time of the heating process in the strong heating step is 75-85 min.
6. The calcination manner of sand-washing mud as claimed in claim 1, wherein the temperature is maintained for 150-180min in the constant temperature step.
7. The calcination mode of the sand-washing mud as claimed in claim 1, wherein the cooling rate of the cooling process in the forced cooling step is not lower than 5-8 ℃/s.
8. The washed-out mud calcination pattern of claim 1, wherein the temperature of the packaging step is less than 150 ℃.
9. The calcination of the sand-washing mud as claimed in claim 1, wherein the temperature of the packing step is 110-150 ℃.
10. Use of a sand washing mud according to any of claims 1-9, characterized in that it is used in the fields of building materials, ceramics, petrochemical industry, grinding wheels and the like.
CN202110242952.4A 2021-03-05 2021-03-05 Sand washing mud calcining mode and application thereof Pending CN113003960A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002086121A (en) * 2000-09-13 2002-03-26 Nisshin Steel Co Ltd Method of treating steel making slag and sand-washing sludge
CN111439942A (en) * 2020-03-20 2020-07-24 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) Method for preparing cement admixture by utilizing engineering waste soil, cement admixture and cement composition
CN112174558A (en) * 2020-10-26 2021-01-05 湖南工学院 Method for preparing active mineral admixture by using sand washing mud

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002086121A (en) * 2000-09-13 2002-03-26 Nisshin Steel Co Ltd Method of treating steel making slag and sand-washing sludge
CN111439942A (en) * 2020-03-20 2020-07-24 哈尔滨工业大学(深圳)(哈尔滨工业大学深圳科技创新研究院) Method for preparing cement admixture by utilizing engineering waste soil, cement admixture and cement composition
CN112174558A (en) * 2020-10-26 2021-01-05 湖南工学院 Method for preparing active mineral admixture by using sand washing mud

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
曾利群等: "深圳地区风化花岗岩渣土资源化利用试验研究", 《非金属矿》 *

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