CN112851155B - Method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of white cement clinker - Google Patents

Method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of white cement clinker Download PDF

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CN112851155B
CN112851155B CN202110251983.6A CN202110251983A CN112851155B CN 112851155 B CN112851155 B CN 112851155B CN 202110251983 A CN202110251983 A CN 202110251983A CN 112851155 B CN112851155 B CN 112851155B
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clinker
raw material
percent
white cement
cement clinker
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CN112851155A (en
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张�浩
龙继承
皮光忠
李辉
程海平
龚凤运
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Gezhouba Shimen Special Cement Co ltd
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Gezhouba Shimen Special Cement Co ltd
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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
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • 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
    • C04B7/44—Burning; Melting
    • 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
    • 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
    • C04B7/48—Clinker treatment
    • 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)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of the clinker. The white cement is produced by adopting the white cement to completely replace limestone in the prior art, so that the white cement is recycled, and the whiteness and the strength of the cement are ensured.

Description

Method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of white cement clinker
Technical Field
The invention relates to the technical field of cement production, in particular to a method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of the white cement clinker.
Background
The whiteness of white silicate cement clinker is related to the iron content in the raw material components, the calcining temperature in a rotary kiln, the bleaching of the clinker and the like, so that the selection of materials has extremely high requirements on the iron content of the raw materials such as limestone and silicoaluminophosphate materials. In consideration of the cost of raw materials and the reuse of wastes, at present, enterprises replace the raw materials for cement production with industrial waste residues, and one of the waste papermaking white muds is used.
The white mud is the sludge produced in large quantity in the alkali recovery process of pulping and paper making plant, also called causticized white mud, and its main mineral is calcium carbonate (its content is up to above 90%), which can be used as calcareous material to replace (part of) limestone. But the residual alkali content is high, the water content is as high as 45-60%, and the particles are extremely fine. If white cement having a low iron content is excessively selected as one of raw materials for producing white portland cement clinker, the strength of the cement is not good, and if white cement having a relatively high iron content is selected in consideration of the strength, the whiteness of the white cement is affected. In addition, the cement setting time is unstable due to the excessive content of alkali, and the surface weathering of the set cement is also caused.
How to take the strength and whiteness of white cement into account when the white cement is used for producing the white cement is one of the technical problems which are urgently needed to be solved at present.
In addition, the catalyst waste residue is a large amount of sewage generated after synthesis crystallization, gelling, multiple exchange, washing and filtration in the production process of the oil refining catalyst, and is generated after neutralization, sedimentation and filtration, is a powdery solid and is a dangerous solid pollution source and cannot be discarded at will. The reported catalyst waste residue is 50-70 million tons produced in the world every year, is colloidal, contains more aluminum and rare earth elements, and has water content of more than 70 percent and fine granularity. At present, the treatment of the catalyst waste residue only comprises the regeneration of the carbon deposition inactivation catalyst and the recovery of metals by a leaching method, so that the industrialization is realized to a certain extent, and other methods have not been better for harmless treatment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of the white cement clinker.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of the white cement clinker is characterized by comprising the following steps:
(1) raw material proportioning: according to weight percentage, 84 to 88 percent of white mud, 1 to 3 percent of aluminum chloride, 2.5 to 4.0 percent of catalyst waste residue, 7.5 to 10 percent of siliceous material and 0.3 to 0.5 percent of mineralizer are mixed;
(2) pretreating white mud: adding aluminum chloride into the white mud recovered by papermaking, and fully and uniformly stirring the mixture to neutralize the alkalinity in the white mud;
(3) pre-mixing and pre-sintering: adding catalyst waste residues into the mixture obtained in the step (2), fully mixing, and then sending into a pre-sintering furnace for pre-sintering, wherein the pre-sintering temperature is 200-300 ℃; drying the water and simultaneously solidifying harmful substances in the catalyst waste residue;
(4) grinding: according to the raw material proportion, feeding the mixture obtained by the treatment in the step (3), siliceous materials and mineralizers into a vertical pulverizer for pulverizing, and then feeding the pulverized mixture into a homogenizing warehouse for homogenizing;
(5) thin material fast burning: feeding the raw material treated in the step (4) into a preheater, rapidly preheating the raw material to 850 ℃ from normal temperature, then feeding the raw material into a decomposing furnace for decomposition, and then feeding the raw material into a rotary kiln for calcination, wherein the rotary kiln is kept in a weak reducing atmosphere in the calcination process, and the operation is carried out by adopting a thin material fast burning method so as to ensure that the proportion of fine particles in the clinker is more than 90%;
(6) bleaching and cooling.
Furthermore, in the raw material ingredients, the saturation ratio KH =0.94 +/-0.02, the silicon rate n =5.2 +/-0.3 and Fe2O3≤0.15%。
Further, in the clinker quick-burning step, the burning zone is controlled to be nearest to the kiln head so as to ensure that the raw meal is melted in the shortest time.
Further, in the bleaching and cooling step, the high-temperature clinker from the step (5) enters a bleaching machine for bleaching, the temperature is reduced to 600 ℃, then the high-temperature clinker enters a grate cooler for cooling to be below 100 ℃, and finally the high-temperature clinker is conveyed to a clinker storage for storage, wherein a circulating weak reducing atmosphere is adopted in the bleaching and cooling process.
Compared with the prior art, the invention has the beneficial effects that:
1. white cement is produced by adopting the white cement to completely replace limestone in the prior art, so that the white cement is recycled, and the whiteness and the strength of the cement are ensured;
2. through the pretreatment of the white mud, the premixing and presintering with the catalyst and the like, the alkaline problem of the white mud can be effectively relieved, meanwhile, the strength of the white mud is improved by using the effective components in the catalyst waste residue, and simultaneously, the requirement on whiteness is also met;
3. the invention adopts the operation method of thin material quick firing, which can reduce the generation of clinker powder, reduce the generation of large-particle clinker, ensure that the particles of the clinker discharged from the kiln are uniform and uniform, and the particles are fine, thereby providing guarantee for ensuring the whiteness of the clinker;
4. by adopting the circulating weak reducing atmosphere in the bleaching and cooling step, the bleaching degree can be effectively ensured, and the oxidation is also prevented.
Detailed Description
The present invention will now be described in further detail with reference to specific examples. The following are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent or similar substitutes should fall within the scope of protection of the present application without departing from the inventive concept. And the details which are not described below should be performed according to the prior art or the conventional techniques in the field.
For better explanation of the invention, in terms of raw material selection: the calcareous material is white mud, and the siliceous material is SO2The silica tailings with relatively high content and the mineralizer are fluorite, and the chemical analysis of the raw materials is shown in Table 1.
Table 1: analysis of raw Material composition
Figure 146252DEST_PATH_IMAGE001
Example one
In this embodiment, the method for producing white cement clinker by using chemical waste residues and improving whiteness and strength thereof includes the following steps:
(1) raw material proportioning: according to the weight percentage, 87.5 percent of white mud, 2 percent of aluminum chloride, 2.5 percent of catalyst waste residue, 7.5 percent of silica sand tailings and 0.5 percent of fluorite are mixed;
(2) pretreating white mud: adding aluminum chloride into the white mud recovered by papermaking, and fully and uniformly stirring the mixture to neutralize the alkalinity in the white mud;
(3) pre-mixing and pre-sintering: adding catalyst waste residues into the mixture obtained in the step (2), fully mixing, and then sending into a pre-sintering furnace for pre-sintering, wherein the pre-sintering temperature is 200-300 ℃; drying the water and simultaneously solidifying harmful substances in the catalyst waste residue;
(4) grinding: according to the raw material proportion, feeding the mixture obtained by the treatment in the step (3), siliceous materials and mineralizers into a vertical pulverizer for pulverizing, and then feeding the pulverized mixture into a homogenizing warehouse for homogenizing;
(5) thin material fast burning: feeding the raw material treated in the step (4) into a preheater, rapidly preheating the raw material to 850 ℃ from normal temperature, then feeding the raw material into a decomposing furnace for decomposition, and then feeding the raw material into a rotary kiln for calcination, wherein the rotary kiln is kept in a weak reducing atmosphere in the calcination process, and the operation is carried out by adopting a thin material fast burning method so as to ensure that the proportion of fine particles in the clinker is more than 90%;
(6) bleaching and cooling: and (3) the high-temperature clinker from the step (5) enters a bleaching machine under the drive of reducing gas, bleaching is carried out in a mode of vertical convection of cooling water and the clinker, so that the temperature is reduced to 600 ℃ after bleaching, then the high-temperature clinker enters a grate cooler to be cooled to be below 100 ℃, and finally the high-temperature clinker is conveyed to a clinker storage tank for storage, wherein the bleaching and cooling process is accompanied by circulating weak reducing atmosphere.
Example two
The following differences are the same as in the first embodiment:
raw material proportioning: by weight percentage, 86.1 percent of white mud, 2 percent of aluminum chloride, 3.0 percent of catalyst waste residue, 8.5 percent of silica sand tailings and 0.4 percent of fluorite are mixed.
EXAMPLE III
Raw material proportioning: according to weight percentage, 85.9 percent of white mud, 1 percent of aluminum chloride, 3.6 percent of catalyst waste residue, 9.2 percent of silica sand tailings and 0.3 percent of fluorite are mixed.
Example four
Raw material proportioning: by weight percentage, 85.7 percent of white mud, 1 percent of aluminum chloride, 4.0 percent of catalyst waste residue, 9.0 percent of silica sand tailings and 0.3 percent of fluorite are mixed.
EXAMPLE five
Raw material proportioning: according to weight percentage, 85.3 percent of white mud, 2 percent of aluminum chloride, 2.5 percent of catalyst waste residue, 9.8 percent of silica sand tailings and 0.4 percent of fluorite are mixed.
The chemical components of the raw materials and the physical properties of the clinker in the above five examples are shown in the following tables two and three:
table two: chemical composition of raw meal
Figure 960624DEST_PATH_IMAGE002
Table three: physical properties of clinker
Figure 783087DEST_PATH_IMAGE003
As seen from the table III, the whiteness of the clinker produced by the method basically reaches more than 90, and the 28-day compressive strength reaches more than 67 MPa. Compared with white cement clinker produced by limestone, the white cement clinker has better whiteness.

Claims (4)

1. A method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of the white cement clinker is characterized by comprising the following steps:
(1) raw material proportioning: according to weight percentage, 84 to 88 percent of white mud, 1 to 3 percent of aluminum chloride, 2.5 to 4.0 percent of catalyst waste residue, 7.5 to 10 percent of siliceous material and 0.3 to 0.5 percent of mineralizer are mixed;
(2) pretreating white mud: adding aluminum chloride into the white mud recovered by papermaking, and fully and uniformly stirring the mixture to neutralize the alkalinity in the white mud;
(3) pre-mixing and pre-sintering: adding catalyst waste residues into the mixture obtained in the step (2), fully mixing, and then sending into a pre-sintering furnace for pre-sintering, wherein the pre-sintering temperature is 200-300 ℃; drying the water and simultaneously solidifying harmful substances in the catalyst waste residue;
(4) grinding: according to the raw material proportion, feeding the mixture obtained by the treatment in the step (3), siliceous materials and mineralizers into a vertical pulverizer for pulverizing, and then feeding the pulverized mixture into a homogenizing warehouse for homogenizing;
(5) thin material fast burning: feeding the raw material treated in the step (4) into a preheater, rapidly preheating the raw material to 850 ℃ from normal temperature, then feeding the raw material into a decomposing furnace for decomposition, and then feeding the raw material into a rotary kiln for calcination, wherein the rotary kiln is kept in a weak reducing atmosphere in the calcination process, and the operation is carried out by adopting a thin material fast burning method so as to ensure that the proportion of fine particles in the clinker is more than 90%;
(6) bleaching and cooling.
2. The method as claimed in claim 1, wherein the saturation ratio of raw material is KH =0.94 + -0.02, the silicon ratio is n =5.2 + -0.3, and Fe in the raw material mixture2O3≤0.15%。
3. The method for producing white cement clinker and improving whiteness and strength thereof using chemical waste residues as claimed in claim 1 or 2, wherein in the clinker rapid-burning step, the burning zone is controlled to be nearest to the kiln head to ensure that the raw meal is melted in a minimum time.
4. The method for producing white cement clinker and improving whiteness and strength thereof using chemical waste residues as claimed in claim 3, wherein in the bleaching and cooling step, the high temperature clinker from the step (5) enters a bleaching machine for bleaching, then the temperature is reduced to 600 ℃, then enters a grate cooler for cooling to below 100 ℃, and finally is conveyed to a clinker storage for storage, wherein a circulating weak reducing atmosphere is adopted in the bleaching and cooling process.
CN202110251983.6A 2021-03-08 2021-03-08 Method for producing white cement clinker by using chemical waste residues and improving whiteness and strength of white cement clinker Active CN112851155B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103771735A (en) * 2012-10-19 2014-05-07 中国石油化工股份有限公司 Method for preparing cement by using slaked lime to treat polyolefin catalyst titanium-containing waste residue
CN106977120A (en) * 2017-05-26 2017-07-25 葛洲坝石门特种水泥有限公司 A kind of white cement clinker and its calcining, cooling bleaching method

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* Cited by examiner, † Cited by third party
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US6776838B2 (en) * 2001-03-02 2004-08-17 Albacem, Llc White pozzolan composition and blended cements containing same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103771735A (en) * 2012-10-19 2014-05-07 中国石油化工股份有限公司 Method for preparing cement by using slaked lime to treat polyolefin catalyst titanium-containing waste residue
CN106977120A (en) * 2017-05-26 2017-07-25 葛洲坝石门特种水泥有限公司 A kind of white cement clinker and its calcining, cooling bleaching method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
造纸白泥代替石灰石煅烧水泥熟料的实验研究;时术兆，齐砚勇;《中国水泥》;20081030(第10期);第55-57页 *

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