CN110451823B - Process for preparing portland cement by using carbide slag and tailing slag and portland cement - Google Patents
Process for preparing portland cement by using carbide slag and tailing slag and portland cement Download PDFInfo
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- CN110451823B CN110451823B CN201910681949.5A CN201910681949A CN110451823B CN 110451823 B CN110451823 B CN 110451823B CN 201910681949 A CN201910681949 A CN 201910681949A CN 110451823 B CN110451823 B CN 110451823B
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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
- C04B7/02—Portland cement
- C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
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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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
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- 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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Abstract
The invention discloses a process for preparing portland cement by using carbide slag and tailing slag and corresponding portland cement, which comprises the following steps: 1) drying the carbide slag in a dryer until the water content is less than 1.5 percent, wherein the dehydrated carbide slag mainly comprises Ca (OH)2Powder; 2) 0.55-0.75 part of dried carbide slag, 0.045-0.065 part of aluminum ash, 0.15-0.30 part of tailing slag and 0.02-0.04 part of iron correction raw materials are sent to a raw material mill to be ground into raw material powder with the water content of less than 1.5 percent through a proportioning machine and an electronic belt scale according to the weight part ratio; 3) homogenizing raw material powder and then feeding into a rotary kiln for calcination; 4) after the calcination, cooling the calcined dry material balls by a cooling machine; 5) after the dry material balls in the step 4) are cooled, 5.0-8.0% of gypsum and 12.0-30.0% of mixed material are added into the cooled dry material balls and sent into a ball mill for grinding to prepare the silicate cement with different grades. The invention not only improves the resource recycling, but also solves the problem of serious threat to life, property and ecology caused by long-term stockpiling of wastes.
Description
Technical Field
The invention relates to the field of waste recycling, in particular to a process for preparing portland cement by using carbide slag and tailing slag and corresponding portland cement.
Background
Acetylene sludge, which is the waste residue obtained by hydrolyzing calcium carbide to obtain acetylene gas and taking calcium hydroxide as a main component. Second stepAlkyne (C)2H2) Is one of the important raw materials of the basic organic synthesis industry, and is prepared from calcium carbide (CaC)2) The process for producing acetylene by adding water (wet method) as raw material is simple and mature, and currently occupies a large proportion in China. More than 300 kg of acetylene gas can be generated by adding water into 1t of calcium carbide, and 10t of industrial waste liquid with the solid content of about 12 percent is generated at the same time, and is commonly called as calcium carbide slurry. Acetylene is the main raw material for producing polyvinyl chloride (PVC). According to production experience, 1.5-1.6t of calcium carbide is consumed for producing 1t of PVC product, 1.2t of calcium carbide slag (dry basis) is generated for producing 1.2t of calcium carbide, the water content of the calcium carbide slag is calculated according to 90%, and about 20t of calcium carbide slag slurry is discharged for producing 1t of PVC product. Therefore, the production amount of the carbide slag slurry greatly exceeds the yield of PVC. After further dehydration, the water content of the carbide slag still reaches 40-50 percent, the carbide slag is pasty, the carbide slag is easy to leak and pollute the road surface in the transportation process, and long-term accumulation not only occupies a large amount of land, but also has serious erosion effect on the land. Only the breakthrough is made in the technology, a new treatment process is sought, the waste is changed into valuable, the calcium carbide waste residue is effectively utilized, good economic benefits, environmental benefits and social benefits can be brought, and the waste can be changed into valuable.
The reaction of hydrolyzing the calcium carbide to obtain acetylene and generating calcium carbide slag is as follows:
CaC2+2H2O﹦C2H2+Ca(OH)2+127.3 KJ/mol
The carbide slag mainly comprises the following chemical components:
| item | Ca(OH)2 | MgO | Fe2O3 | SiO3 | H2 | Burning vector |
| Ratio (%) | 85.0-90.0 | 0.55-1.75 | 8.2-10.3 | 0.46-1.4 | 3.38-11 | 1.0-3.0 |
The tailing slag derived tailings refer to solid wastes discharged in the mining and mineral separation processes, retain metal and nonmetal valuable minerals, are composite materials rich in silicate, carbonate and other substances, and have the double characteristics of secondary resources and environmental pollution. It causes serious environmental problems and huge potential safety hazards, but it is essentially a poor, fine and miscellaneous mineral resource, is a resource when being used, is a waste material when not being used, and is a 'timing bomb' if being stockpiled and not protected well "
The main chemical components are as follows:
| item | CaO | MgO | Fe2O3 | Al2O3 | SiO2 | Burning vector |
| Ratio (%) | 8.35-20.5 | 0.55-1.65 | 10.5-26.3 | 1.2-6.0 | 35.6-61.2 | 3.5-4.2 |
Disclosure of Invention
Aiming at the problems, the invention provides a process for preparing portland cement by using waste carbide slag and tailing slag and corresponding portland cement, which not only improves the reutilization of the waste, but also solves the problem of serious life, property and ecology threats caused by long-term stockpiling of the waste.
In order to solve the technical problems, the invention provides a process for preparing portland cement by using carbide slag and tailing slag, which comprises the following steps:
1) drying the carbide slag in a dryer until the water content is less than 1.5 percent, wherein the dehydrated carbide slag mainly comprises Ca (OH)2Powder;
2) 0.55-0.75 part of dried carbide slag, 0.045-0.065 part of aluminum ash, 0.15-0.30 part of tailing slag and 0.02-0.04 part of iron correction raw materials are sent to a raw material mill to be ground into raw material powder with the water content of less than 1.5 percent through a proportioning machine and an electronic belt scale according to the weight part ratio;
3) homogenizing raw material powder and then feeding into a rotary kiln for calcination;
4) after the calcination, cooling the calcined dry material balls by a cooling machine;
5) after the dry material balls in the step 4) are cooled, 5.0-8.0% of gypsum and 12.0-30.0% of mixed material are added into the cooled dry material balls and sent into a ball mill for grinding to prepare the silicate cement with different grades.
Further, the CaO content of the dehydrated carbide slag in the step 1) is 62.0-65.7%.
Further, each raw material in the step 2) is calculated according to the mixture ratio, and three values are respectively controlled: KH is controlled to be 0.88-0.92, SM is controlled to be 2.1-2.5, and IM is controlled to be 1.3-1.5.
Further, the calcining time in the step 3) is 25-45 min until the temperature of the mixture reaches 1350-1450 ℃, the 3-day compressive strength of the calcined clinker is 32-35MPa, and the 28-day compressive strength is 53-57 MPa.
Further, the dried material balls in the step 4) are cooled to be below 80 ℃ by a cooler.
Further, coal ash is sprayed into the rotary kiln through a coal spraying device in the step 3), and the blending amount of the coal ash is 3.0-5.0%.
Further, the incorporation amount of the coal ash is 4.57%.
The portland cement prepared by utilizing the carbide slag and the tailing slag comprises the following raw materials in percentage by weight:
0.55-0.75 parts of dried carbide slag
0.045-0.065 parts of aluminum ash;
0.15-0.30 parts of tailing slag;
0.02-0.04 part of iron correction raw material;
5.0 to 8.0 percent of gypsum;
15.0 to 30.0 percent of mixed material;
the preparation of portland cement was carried out according to the preparation process described above.
Compared with the prior art, the preparation method has the beneficial effects that the preparation process provided by the invention is simple, the carbide slag, the aluminum ash, the tailing slag and the correction material can be mixed and calcined to prepare the portland cement, the solid waste is eliminated, and the local beautiful natural ecological human environment is protected powerfully; accelerating the recycling of renewable resources, changing waste into valuable, turning harm into benefit, treating pollution, improving environment, releasing occupied land resources and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a process diagram illustrating a process for preparing portland cement using carbide slag and tailings.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a process for preparing portland cement by using carbide slag and tailings slag comprises the following steps: firstly, the carbide slag is sent into a dryer to be dried until the moisture content is less than 1.5 percent, and the dehydrated carbide slag mainly comprises Ca (OH)2And (3) powder, wherein the CaO content in the carbide slag is 62.0-65.7%. Then, according to the weight portion ratio, 0.55-0.75 portion of carbide slag, namely dried carbide, 0.045-0.065 portion of aluminum ash, 0.15-0.3 portion of tailing slag and 0.02-0.04 portion of iron correction raw materials are subjected to electronic proportioning, the KH, SM and IM respectively are controlled to be 0.88-0.92, 2.1-2.5 and 1.3-1.5, and the raw materials are conveyed to a raw material mill through a proportioning machine and an electronic belt scale to be subjected to raw material grinding, so that raw material powder with the water content of less than 1.5% is prepared. Homogenizing raw material powder, then feeding the raw material powder into a rotary kiln for calcination for 25-45 min until the temperature of the mixture reaches 1350-1450 ℃; the calcined clinker has a compressive strength of 32-35MPa in 3 days and 53-57MPa in 28 days. And during calcination, coal provided by a fuel storage yard is subjected to a coal grinding process and then is sprayed into the rotary kiln through a coal spraying device, and the blending amount of the coal ash is 3.0-5.0%. After calcination, the dry pellets are fed through a cooling machineCooling the clinker to below 80 ℃; the heat generated when the cooler is cooled can be collected, and the collected heat is used for waste heat power generation or used as a drying heat source of carbide slag or conveyed to the dryer to be used as a grinding heat source for recycling; after the dry material balls are cooled, 5.0-8.0% of gypsum and 12.0-30.0% of mixed material are added into the dry material balls and sent into a ball mill together for finished product grinding to prepare different grades of portland cement, and the portland cement is classified and stored.
The raw material composition analysis of this example is shown in table 1.
TABLE 1 analysis of the ingredients of the main raw materials for preparing Portland cement
The preparation process of the embodiment is used for calculating the ingredients of the raw materials and checking and analyzing the whole process.
The industrial analysis of coal and coal ash is shown in table 2.
TABLE 2 Industrial analysis of coal and coal Ash
Calculating the amount of coal ash incorporated
GA ═ (q × Ay × S)/(Qy) × 100) (S is dust settling rate)
＝(3350*28.56*100)/(20930*100)
＝4.57％
And (3) ingredient calculation: ca (OH) in carbide slag2The content is converted into CaO content of 62.0-65.7%, and the raw material proportioning values are set to KH-0.91, SM-2.10 and IM-1.40.
Let sigma be 97.5%
Then Fe2O3＝∑/((2.8KH+1)(IM+1)SM+2.65IM+1.35)
＝3.5％
Al2O3＝IM*Fe2O3＝4.9％
SiO2＝SM(Al2O3+Fe2O3)＝21.84％
CaO＝∑-(SiO2+Al2O3+Fe2O3)＝67.26％
The chemical compositions of the raw material and the clinker are shown in Table 3.
TABLE 3 analysis of chemical composition of raw material and clinker
Note that the free calcium content is 2.0%.
According to calculated clinker composition check calculation rate value
KH＝(C-1.65*A-0.35F)/2.8S＝0.887
SM＝S/(A+F)＝2.16
IM＝A/F＝1.32
The results KH and IM are slightly lower than required, and the silicon rate is slightly higher but very close to the required value, so that the production can be carried out according to the mixture.
Clinker minerals:
C3S＝3.80(3KH-2)SiO2＝56.39
C2S＝8.60(1-KH)SiO2＝21.81
C3A＝2.65(Al2O3-0.64Fe2O3＝8.48
C4AF＝3.04Fe2O＝12.98
according to the requirement that the ratio of C3S + C2S > 75% in clinker is 78.22%, the sum of C3A + C4AF is 21.46%, the total mineral amount is 99.68%, and the total mineral amount is more than 95.0% of the total mineral amount of portland cement, the production condition of portland cement is met. In conclusion, the preparation process of the embodiment can mix and calcine the white slime/alkali white slime, the aluminum ash, the tailing slag and the correcting material to prepare the portland cement.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The process for preparing the portland cement by using the carbide slag and the tailing slag is characterized by comprising the following steps of: the method comprises the following steps:
1) drying the carbide slag in a dryer until the water content is less than 1.5 percent, wherein the dehydrated carbide slag mainly comprises Ca (OH)2Powder;
2) sending 0.55-0.75 part of dried carbide slag, 0.045-0.065 part of aluminum ash, 0.15-0.30 part of tailing slag and 0.02-0.04 part of iron correction raw materials by weight part ratio to a raw material mill for grinding to prepare raw material powder with the water content of less than 1.5 percent through a proportioning machine and an electronic belt scale;
3) homogenizing raw material powder and then feeding into a rotary kiln for calcination;
4) after the calcination, cooling the calcined dry material balls by a cooling machine;
5) after the dry material balls in the step 4) are cooled, 5.0-8.0% of gypsum and 12.0-30.0% of mixed material are added into the cooled dry material balls and sent into a ball mill for grinding to prepare silicate cement with different grades;
the raw materials in the step 2) are calculated according to the mixture ratio, and three values are respectively controlled: KH is controlled to be 0.88-0.92, SM is controlled to be 2.1-2.5, and IM is controlled to be 1.3-1.5;
the calcination temperature in the step 3) is 1350-1450 ℃, and the calcination time is 25-45 min.
2. The process for producing portland cement using carbide slag and tailings as claimed in claim 1, wherein: the CaO content of the dehydrated carbide slag in the step 1) is 62.0-65.7%.
3. The process for producing portland cement using carbide slag and tailings as claimed in claim 1, wherein: the compression strength of the clinker calcined in the step 3) is 32-35MPa in 3 days, and the compression strength of the clinker calcined in 28 days is 53-57 MPa.
4. The process for producing portland cement using carbide slag and tailings as claimed in claim 1, wherein: and 4) cooling the dried material balls to be below 80 ℃ by a cooler.
5. The process for producing portland cement using carbide slag and tailings as claimed in claim 1, wherein: and 3) spraying coal ash into the rotary kiln through a coal spraying device, wherein the doping amount of the coal ash is 3.0-5.0%.
6. The process for producing portland cement using carbide slag and tailings as claimed in claim 5, wherein: the mixing amount of the coal ash is 4.57%.
7. The portland cement prepared by using the carbide slag and the tailing slag is characterized by comprising the following raw materials in percentage by weight:
0.55-0.75 parts of dried carbide slag
0.045-0.065 parts of aluminum ash;
0.15-0.30 parts of tailing slag;
0.02-0.04 part of iron correction raw material;
5.0 to 8.0 percent of gypsum;
15.0 to 30.0 percent of mixed material;
the production of portland cement is carried out according to the production process of any one of claims 1 to 6.
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| CN111499232A (en) * | 2020-05-08 | 2020-08-07 | 张延年 | Large-mixing-amount industrial solid waste composite Portland cement and preparation method thereof |
| CN112125544A (en) * | 2020-09-25 | 2020-12-25 | 张延年 | Multi-solid waste coupling portland cement and preparation method thereof |
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| JP2001146455A (en) * | 1999-11-15 | 2001-05-29 | Taiheiyo Cement Corp | Hydraulic composition |
| CN108314340A (en) * | 2018-04-09 | 2018-07-24 | 河南理工大学 | It is a kind of using tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN108516709A (en) * | 2018-04-09 | 2018-09-11 | 河南理工大学 | It is a kind of using Pb-Zn tailings as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN109053006A (en) * | 2018-10-24 | 2018-12-21 | 河南理工大学 | It is a kind of using Tungsten tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN109293260A (en) * | 2018-10-24 | 2019-02-01 | 河南理工大学 | It is a kind of using copper tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN109320110A (en) * | 2018-10-24 | 2019-02-12 | 河南理工大学 | It is a kind of using sulphur tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001146455A (en) * | 1999-11-15 | 2001-05-29 | Taiheiyo Cement Corp | Hydraulic composition |
| CN108314340A (en) * | 2018-04-09 | 2018-07-24 | 河南理工大学 | It is a kind of using tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN108516709A (en) * | 2018-04-09 | 2018-09-11 | 河南理工大学 | It is a kind of using Pb-Zn tailings as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN109053006A (en) * | 2018-10-24 | 2018-12-21 | 河南理工大学 | It is a kind of using Tungsten tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN109293260A (en) * | 2018-10-24 | 2019-02-01 | 河南理工大学 | It is a kind of using copper tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
| CN109320110A (en) * | 2018-10-24 | 2019-02-12 | 河南理工大学 | It is a kind of using sulphur tailing as sulphoaluminate cement clinker of raw material and preparation method thereof |
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