CN111268929B - Green and environment-friendly cement and preparation method thereof - Google Patents

Green and environment-friendly cement and preparation method thereof Download PDF

Info

Publication number
CN111268929B
CN111268929B CN202010220537.4A CN202010220537A CN111268929B CN 111268929 B CN111268929 B CN 111268929B CN 202010220537 A CN202010220537 A CN 202010220537A CN 111268929 B CN111268929 B CN 111268929B
Authority
CN
China
Prior art keywords
parts
weight
cement
slag
cement clinker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010220537.4A
Other languages
Chinese (zh)
Other versions
CN111268929A (en
Inventor
李俊周
赵红俊
张其山
吴旭伟
荆永卫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIAXIAN ZHONGLIAN TIANGUANG CEMENT CO Ltd
Original Assignee
JIAXIAN ZHONGLIAN TIANGUANG CEMENT CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JIAXIAN ZHONGLIAN TIANGUANG CEMENT CO Ltd filed Critical JIAXIAN ZHONGLIAN TIANGUANG CEMENT CO Ltd
Priority to CN202010220537.4A priority Critical patent/CN111268929B/en
Publication of CN111268929A publication Critical patent/CN111268929A/en
Application granted granted Critical
Publication of CN111268929B publication Critical patent/CN111268929B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
    • 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
    • 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
    • C04B7/24—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
    • 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

Abstract

The invention discloses green environment-friendly cement and a preparation method thereof, belonging to the technical field of cement manufacture. The green environment-friendly cement comprises cement clinker and a mixed material, wherein the cement clinker is mainly prepared from the following raw materials in parts by weight: 150-160 parts of limestone, 13-15 parts of sandstone, 4-5 parts of pyrite cinder, 8-10 parts of coal gangue and 3-5 parts of iron ore slag. The preparation method of the green environment-friendly cement comprises the following steps: 1) mixing and grinding the raw materials of the cement clinker to prepare raw materials, preheating and decomposing the raw materials, sintering the raw materials at 1350-1450 ℃ for 20 to 30min, and quenching the raw materials to prepare the cement clinker; 2) mixing and grinding the cement clinker prepared in the step 1) and the mixed material to obtain the cement clinker. The green and environment-friendly cement provided by the invention utilizes sulfuric acid slag, iron ore slag and the like, improves the utilization degree of waste materials, is green and environment-friendly, and can reduce the cost.

Description

Green and environment-friendly cement and preparation method thereof
Technical Field
The invention relates to the technical field of cement manufacturing, in particular to green environment-friendly cement and a preparation method thereof.
Background
With the comprehensive development of the infrastructure of China, the use amount of various building materials is larger and larger, and the use amount of cement materials is increased day by day. During cement production, many raw materials are natural non-renewable resources although the raw materials are mineral products with low economic value, and the resource storage amount is gradually reduced along with the increase of the resource usage amount. The industrial solid wastes are adopted to replace or partially replace cement production raw materials to form a sustainable development production mode, and the production cost can be reduced.
However, many industrial solid wastes are complex in ingredients, some of which can play an important role in the cement clinker firing process and some of which are relatively weak. The cement clinker firing is to mix and grind raw materials according to a proper proportion to obtain raw materials, then sinter the raw materials at a high temperature to a molten state and cool the raw materials, wherein the high-temperature sintering mainly comprises the processes of water evaporation, sandstone dehydration, limestone decomposition, solid-phase reaction, liquid-phase reaction and the like, but not all the raw materials participate in the reaction in each process, and how to adjust the proportion of various raw materials to fully play the role of the raw materials can ensure that the waste materials are utilized without reducing the performance of the cement.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide environment-friendly cement which makes full use of various industrial waste residues and improves the strength of the cement.
The second purpose of the invention is to provide a preparation method of environment-friendly cement, which has short high-temperature sintering time and high production efficiency.
In order to achieve the first object, the invention provides the following technical scheme:
the green environment-friendly cement comprises cement clinker and a mixed material, wherein the cement clinker is mainly prepared from the following raw materials in parts by weight: 160 parts of limestone 150-15 parts of sandstone, 4-5 parts of pyrite cinder, 8-10 parts of coal gangue and 3-5 parts of iron ore slag.
By adopting the technical scheme, the raw materials of the cement clinker are added with the pyrite cinder, the sandstone and the coal gangue besides the limestone, so that the effects of different components in various raw materials can be fully exerted, and the finally prepared cement has higher strength. The iron ore slag is added into the raw materials, the content of iron element in the iron ore slag is high, the proportion of iron compound in the finally prepared cement can be improved, the viscosity of a mobile phase can be reduced in the sintering process of cement clinker, the full contact degree between the raw materials is improved, the reaction efficiency is accelerated, the raw materials and the energy are saved, and the production cost is reduced. The sulfuric acid slag contains ferric oxide, aluminum oxide and the like, and can also promote the raw materials to be melted quickly, generate more liquid phases and improve the reaction efficiency. The sulfur contained in the sulfate slag can play a role of mineralization during sintering, promote dicalcium silicate to quickly and fully absorb calcium oxide in a liquid phase, and further improve the reaction efficiency. Because of more liquid phase, the amount of sandstone in the raw materials is larger, and more free SiO can be provided2And the reaction is participated, in addition, the sandstone left over in the limestone mine exploitation can be fully utilized as a raw material, and the waste material is utilized, so that the environmental protection is facilitated. Because the raw materials adopt more industrial waste materials such as sandstone, pyrite cinder, coal gangue and iron ore slag, the waste utilization is realized, the energy consumption can be reduced, and the environment is protected.
The invention is further configured to: the cement clinker is mainly prepared from the following raw materials in parts by weight: 160 portions of limestone 150-one materials, 13.5-15 portions of sandstone, 4.2-5 portions of pyrite cinder, 8.8-10 portions of coal gangue and 3.5-5 portions of iron ore slag.
By adopting the technical scheme, the proportion of the raw materials is optimized, the proportion of the sandstone and the coal gangue is increased, the utilization degree of waste materials is greatly improved, and meanwhile, the raw material cost is integrally reduced.
The invention is further configured to: the raw material also comprises 15-18 parts by weight of construction waste, and the construction waste comprises concrete waste.
By adopting the technical scheme, the construction waste is added into the raw materials of the cement clinker, the problem of treatment of the construction waste can be solved, the cost of construction waste treatment is saved, and the construction waste is utilized and is beneficial to environmental protection. The concrete in the building waste material contains a certain amount of unhydrated clinker particles, the particles are wrapped by hydration products, the hydration products on the surface layer are peeled off in the raw material grinding process, the unhydrated clinker particles are exposed and then refined into fine particles, and the C3S in the fine particles can play a role of seed crystals in the sintering process to improve the easy-burning property of the raw material.
The invention is further configured to: the construction waste comprises the following components in percentage by weight: 55.6% SiO212.5% of Al2O316.7 percent of CaO and 3.7 percent of MgO.
By adopting the technical scheme, the building waste has reasonable component proportion, contains more aluminum and calcium besides silicon, can fully play the activation role of the aluminum and the calcium when the cement clinker is sintered, and improves the easy burning property of the raw material.
The invention is further configured to: the raw material also comprises 3-5 parts by weight of barium slag.
By adopting the technical scheme, the barium slag has good cohesive action and stronger binding force with other raw materials, and the reaction efficiency can be further improved. Moreover, due to the action of alkaline substances in the barium slag, a certain excitation and activation effect can be achieved on a silicon phase and an aluminum phase in the sintering process.
The invention is further configured to: the raw material also comprises 2-3 parts by weight of copper slag.
By adopting the technical scheme, the internal crystals of the copper slag have more defects, the activation energy is lower, and the reaction can occur earlier during sintering. The slag also contains more Fe, so that the lowest eutectic temperature of the fired materials can be reduced, the liquid phase quantity is increased, and the reaction efficiency is improved.
The invention is further configured to: the raw material also comprises 8-10 parts by weight of clay.
Through adopting above-mentioned technical scheme, clay has porous structure, and is more abundant with other raw materials contact, can increase the cohesion between each raw materials, improves the abundant degree of reaction between the raw materials. The calcium oxide generated by decomposing limestone has higher activity, and the clay can provide more free silicon dioxide, so that the probability of early contact with the calcium oxide is increased, the reaction efficiency of generating the C2S phase and the C3S phase is improved, and the easy-burning property of the raw materials is further improved.
The invention is further configured to: the weight ratio of the cement clinker to the mixed material is 65-70:30-35, and the mixed material is formed by mixing limestone, fly ash and desulfurized gypsum according to the weight ratio of 10-12:16-18: 12-15.
By adopting the technical scheme, the mixed material comprises the desulfurized gypsum and the limestone and the fly ash, so that rich calcium element can be provided, and the hydration efficiency of cement can be improved after the mixed material is mixed with cement clinker.
In order to achieve the second object, the invention provides the following technical scheme:
the preparation method of the green environment-friendly cement comprises the following steps:
1) mixing and grinding the raw materials of the cement clinker to prepare raw materials, preheating and decomposing the raw materials, then sintering the raw materials at 1350-;
2) mixing and grinding the cement clinker prepared in the step 1) and the mixed material to obtain the cement clinker.
By adopting the technical scheme, the time for subsequent sintering can be shortened to a certain extent after the raw materials are preheated and decomposed. In addition, a certain amount of iron ore slag is added into the raw materials of the cement clinker, so that the sintering time can be shortened, and the energy consumption is greatly reduced.
The invention is further configured to: the decomposition temperature is 800-900 ℃.
By adopting the technical scheme, the decomposition temperature is 800-900 ℃, most calcium carbonate can be decomposed to generate a large amount of active calcium oxide, the reaction probability with other raw materials is increased, and the reaction efficiency can be further improved.
In conclusion, the invention has the following beneficial effects:
firstly, the green and environment-friendly cement has reasonable component matching of raw materials in the cement clinker, can promote the sintering reaction of the cement clinker and improve the comprehensive performance of the cement clinker. And the sulfuric acid slag, the iron ore slag and the like are utilized, the utilization degree of waste materials is improved, and the environment is protected, and the cost can be reduced.
Secondly, the cement clinker of the green and environment-friendly cement is added with the building waste during preparation, so that the concrete can be recycled, the cost is further saved, the environment pollution caused by the building waste can be avoided, and the environment protection is facilitated.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The cement is obtained by uniformly mixing cement clinker and mixed materials according to the mass ratio of 65-70: 30-35. The mixed material can adopt the mixed material in the prior art, and preferably, the mixed material is formed by mixing limestone, fly ash and desulfurized gypsum according to the weight ratio of 11:18: 12.
Furthermore, the raw materials for preparing the cement clinker of the cement of the invention also comprise 0.8 to 1 weight part of calcium zincate.
The limestone adopted in the invention comprises the following components in percentage by weight: 45-49.5% of CaO and 3-5% of SiO2And 2-3.5% of MgO. Preferably, the limestone comprises the following components in percentage by weight: 49.22% CaO, 3.76% SiO2And 2.63% of MgO.
The pyrite cinder adopted by the invention comprises the following components in percentage by weight: 38-42% Fe2O329-35% of SiO25.6-8.8% of Al2O36.5 to 7.8 percent of CaO and 0.5 to 1.1 percent of MgO. The pyrite cinder also contains 0.8-1.5% of SO3. Preferably, the pyrite cinder comprises the following components in percentage by weight: 41.72% Fe2O330.08% SiO25.75% of Al2O37.22 percent of CaO and 0.82 percent of MgO.
The coal gangue adopted by the invention comprises the following components in percentage by weight: 60-62% SiO219-21% of Al2O35.5-7% of Fe2O34 to 5 percent of CaO, 0.5 to 1.2 percent of MgO and 1.5 to 2.3 percent of K2O, 0.5-0.8% TiO2. Preferably, the coal gangue comprises the following components in percentage by weight: 60.8% SiO220.1% of Al2O36.4% of Fe2O34.8 percent of CaO, 1.1 percent of MgO and 2.0 percent of K2O, 0.6% TiO2。
The iron ore slag adopted by the invention comprises the following components in percentage by weight: 35-37% of SiO25-6% of Al2O327-29% of Fe2O315 to 17 percent of CaO and 2.5 to 3.5 percent of MgO. The ignition loss was 6.36%.
The construction waste adopted by the invention is obtained by crushing and screening concrete, bricks and the like.
The construction waste comprises the following components in percentage by weight: 53-56% SiO211-13% of Al2O315 to 17 percent of CaO and 2.5 to 4 percent of MgO. Preferably, the construction waste comprises the following components in percentage by weight: 55.6% SiO212.5% of Al2O316.7 percent of CaO and 3.7 percent of MgO.
The copper slag adopted in the invention comprises the following components in percentage by weight: 32-33% SiO233 to 35 percent of FeO and 6.5 to 7 percent of Fe2O35-6% of Al2O310.2 to 11.8 percent of CaO and 5 to 6 percent of MgO. Preferably, copper oreThe slag comprises the following components in percentage by weight: 32.87% SiO234.75% FeO, 6.61% Fe2O35.73% of Al2O311.28 percent of CaO and 5.77 percent of MgO.
The barium slag adopted in the invention comprises the following components in percentage by weight: 40-42% of BaO and 11-13% of SO315-17% of SiO23-5% of Al2O35-6% of CaO, 2-3% of MgO and 1-1.5% of Fe2O3. The loss on ignition was 9.5%. Preferably, the barium slag comprises the following components in percentage by weight: 41.25% of BaO and 11.98% of SO315.73% of SiO23.26% of Al2O35.41 percent of CaO, 2.32 percent of MgO and 1.18 percent of Fe2O3。
The clay adopted in the invention is preferably a scleral clay, and further preferably the clay comprises the following components in percentage by weight: 56-57.5% SiO222-24% of Al2O310-11.8% of Fe2O33-4% of K2O and CaO in 0.5-3.5%. The loss on ignition was 5.3%. Further preferably, the clay comprises the following components in percentage by weight: 56.50% SiO222.82% of Al2O310.78% Fe2O33.25% of K2O, 1.63% CaO.
The preparation method of the green environment-friendly cement comprises the following steps: 1) mixing and grinding the raw materials of the cement clinker to prepare raw materials, preheating and decomposing the raw materials, then sintering the raw materials at 1350-; 2) mixing and grinding the cement clinker prepared in the step 1) and the mixed material to obtain the cement clinker.
The step 1) of mixing and grinding the raw materials of the cement clinker is to uniformly mix limestone, sandstone, pyrite cinder, coal gangue and iron ore slag to obtain premix, and then prepare the premix powder into raw materials. Specifically, limestone crushed aggregates, coal gangue crushed aggregates and sandstone are mixed to obtain a first mixture; and uniformly mixing the pyrite cinder and the iron ore slag to obtain a second mixture, and then uniformly mixing the first mixture and the second mixture to obtain the premix.
Or step 1) mixing limestone, sandstone, sulfuric acid residue and coal gangue, and adding barium residue and construction waste. Specifically, limestone crushed aggregates, coal gangue crushed aggregates and sandstone are mixed to obtain a first mixture; mixing the sulfuric acid slag, the iron slag and the barium slag to obtain a second mixture; and then uniformly mixing the first mixture, the second mixture and the construction waste to prepare the premix.
Or step 1) mixing limestone, sandstone, sulfuric acid residue and coal gangue, and adding barium residue, construction waste, copper slag and clay. Specifically, limestone crushed aggregates, coal gangue crushed aggregates and sandstone are mixed to obtain a first mixture; mixing the sulfuric acid slag, the iron slag, the barium slag, the copper slag and the clay to obtain a second mixture; and then uniformly mixing the first mixture, the second mixture and the construction waste to prepare the premix.
After the preheating decomposition, the temperature is raised to 1350 ℃ and 1450 ℃ at the temperature-raising speed of 300 ℃ and 500 ℃/min for sintering.
The volume of 80 μm screen residue in the raw material is not more than 12.5%, and the volume of 200 μm screen residue is not more than 1.6%. Further, the volume of 80 μm screen residue in the raw meal is not more than 10%, and the volume of 200 μm screen residue is not more than 1.2%.
Example 1
The green environment-friendly cement is prepared by mixing cement clinker and a mixed material according to the weight ratio of 70:30, wherein the cement clinker is prepared from the following raw materials by weight: 155.0kg of limestone, 13.0kg of sandstone, 4.0kg of pyrite cinder, 8.0kg of coal gangue and 3.0kg of iron ore slag. The mixed material is formed by mixing limestone, fly ash, desulfurized gypsum and iron ore slag according to the weight ratio of 10:18:12: 9.
Wherein, the mass percent of CaO in the limestone is 49.22%.
The preparation method of the green environment-friendly cement comprises the following steps:
1) crushing limestone and screening to obtain crushed limestone particles; crushing and screening the coal gangue to obtain coal gangue particles; then evenly mixing the limestone particles, the coal gangue particles and the sandstone to obtain a mixture;
uniformly mixing the sulfuric acid slag and the iron slag to obtain a second mixture;
then uniformly mixing the first mixture and the second mixture to obtain a premix;
2) adding the premix prepared in the step 1) into a pulverizer, grinding, screening, adding the granules with larger particle size into the pulverizer again, grinding again, and screening; finally, preparing raw materials; the volume of 80 μm screen residue in the raw material is not more than 12.5%, and the volume of 200 μm screen residue is not more than 1.6%;
3) preheating the raw material prepared in the step 2), predecomposing at 800 ℃, then heating to 1450 ℃ at a heating rate of 300 ℃/min, preserving heat for 25min, and then quenching to obtain cement clinker;
4) mixing and grinding the cement clinker prepared in the step 3) and the mixed material to obtain the cement clinker.
Example 2
The green environment-friendly cement is prepared by mixing cement clinker and a mixed material according to the weight ratio of 70:30, wherein the cement clinker is prepared from the following raw materials by weight: 160.0kg of limestone, 13.5kg of sandstone, 4.5kg of sulfate slag, 9.0kg of coal gangue, 3.5kg of iron ore slag, 15.0kg of construction waste and 3.0kg of barium slag. The mixed material is formed by mixing limestone, fly ash, desulfurized gypsum and iron ore slag according to the weight ratio of 10:18:12: 9.
Wherein, the mass percent of CaO in the limestone is 49.22%.
The preparation method of the green environment-friendly cement comprises the following steps:
1) crushing limestone and screening to obtain crushed limestone particles; crushing and screening the coal gangue to obtain coal gangue particles; then evenly mixing the limestone particles, the coal gangue particles and the sandstone to obtain a first mixture;
uniformly mixing the sulfuric acid slag, the iron ore slag and the barium slag to obtain a second mixture;
then uniformly mixing the first mixture, the second mixture and the construction waste to obtain a premix;
2) adding the premix prepared in the step 1) into a roller mill, grinding, screening, adding the granules with larger particle size into the roller mill again, grinding again, and screening; finally, preparing raw materials; the volume of 80 μm screen residue in the raw material is not more than 10%, and the volume of 200 μm screen residue is not more than 1.2%;
3) preheating the raw material prepared in the step 2), predecomposing at 900 ℃, heating to 1350 ℃ at a heating rate of 350 ℃/min, preserving heat for 30min, and then quenching to obtain cement clinker;
4) mixing and grinding the cement clinker prepared in the step 3) and the mixed material to obtain the cement clinker.
Example 3
The green environment-friendly cement is prepared by mixing cement clinker and a mixed material according to a weight ratio of 65:35, wherein the cement clinker is prepared from the following raw materials by weight: 155.0kg of limestone, 14.0kg of sandstone, 5.0kg of sulfuric acid residue, 10.0kg of coal gangue, 4.0kg of iron ore slag, 16.0kg of construction waste, 5.0kg of barium residue, 3.0kg of copper slag and 8.0kg of clay. The mixed material is formed by mixing limestone, fly ash, desulfurized gypsum and iron ore slag according to the weight ratio of 10:18:12: 9.
Wherein, the mass percent of CaO in the limestone is 49.22%.
The preparation method of the green environment-friendly cement comprises the following steps:
1) crushing limestone and screening to obtain crushed limestone particles; crushing and screening the coal gangue to obtain coal gangue particles; then evenly mixing the limestone particles, the coal gangue particles and the sandstone to obtain a first mixture;
uniformly mixing the sulfuric acid slag, the iron slag, the barium slag, the copper slag and the clay to obtain a second mixture;
then uniformly mixing the first mixture, the second mixture and the construction waste to obtain a premix;
2) adding the premix prepared in the step 1) into a roller mill, grinding, screening, adding the granules with larger particle size into the roller mill again, grinding again, and screening; finally, preparing raw materials; the volume of 80 μm screen residue in the raw material is not more than 10%, and the volume of 200 μm screen residue is not more than 1.2%;
3) preheating the raw material prepared in the step 2), performing pre-decomposition at 850 ℃, then heating to 1350 ℃ at the heating rate of 320 ℃/min, preserving heat for 25min, and then quenching to obtain cement clinker;
4) mixing and grinding the cement clinker prepared in the step 3) and the mixed material to obtain the cement clinker.
Example 4
The green environment-friendly cement is prepared by mixing cement clinker and a mixed material according to a weight ratio of 65:35, wherein the cement clinker is prepared from the following raw materials by weight: 150.0kg of limestone, 14.5kg of sandstone, 4.7kg of sulfate slag, 8.8kg of coal gangue, 5.0kg of iron ore slag, 18.0kg of construction waste, 3.7kg of barium slag, 2.0kg of copper slag, 10.0kg of clay and 0.8kg of calcium zincate. The mixed material is formed by mixing limestone, fly ash, desulfurized gypsum and iron ore slag according to the weight ratio of 10:18:12: 9.
Wherein, the mass percent of CaO in the limestone is 49.22%.
The preparation method of the green environment-friendly cement comprises the following steps:
1) crushing limestone and screening to obtain crushed limestone particles; crushing and screening the coal gangue to obtain coal gangue particles; then evenly mixing the limestone particles, the coal gangue particles and the sandstone to obtain a first mixture;
uniformly mixing the sulfuric acid slag, the iron slag, the barium slag, the copper slag and the clay to obtain a second mixture;
then uniformly mixing the first mixture, the second mixture and the construction waste to obtain a premix;
2) adding the premix prepared in the step 1) into a roller mill, grinding, screening, adding the granules with larger particle size into the roller mill again, grinding again, and screening; finally, preparing raw materials; the volume of 80 μm screen residue in the raw material is not more than 10%, and the volume of 200 μm screen residue is not more than 1.2%;
3) preheating the raw material prepared in the step 2), predecomposing at 830 ℃, heating to 1380 ℃ at a heating rate of 350 ℃/min, preserving heat for 20min, and then quenching to obtain cement clinker;
4) mixing and grinding the cement clinker prepared in the step 3) and the mixed material to obtain the cement clinker.
Example 5
The green environment-friendly cement is prepared by mixing cement clinker and a mixed material according to a weight ratio of 65:35, wherein the cement clinker is prepared from the following raw materials in parts by weight: 152.0kg of limestone, 15.0kg of sandstone, 4.3kg of sulfuric acid residue, 9.2kg of coal gangue, 4.0kg of iron ore slag, 16.5kg of construction waste, 4.5kg of barium slag, 2.5kg of copper ore slag, 8.5kg of clay and 1.0kg of calcium zincate. The mixed material is formed by mixing limestone, fly ash, desulfurized gypsum and iron ore slag according to the weight ratio of 10:18:12: 9.
Wherein, the mass percent of CaO in the limestone is 49.22%.
The preparation method of the green environmental protection cement of this embodiment is the same as that of embodiment 4.
Example 6
The green environment-friendly cement is prepared by mixing cement clinker and a mixed material according to a weight ratio of 65:35, wherein the cement clinker is prepared from the following raw materials by weight: 152.0kg of limestone, 14.8kg of sandstone, 4.2kg of sulfate slag, 9.5kg of coal gangue, 3.5kg of iron ore slag, 17.0kg of construction waste, 4.5kg of barium slag, 2.5kg of copper slag, 8.8kg of clay and 0.8kg of calcium zincate. The mixed material is formed by mixing limestone, fly ash, desulfurized gypsum and iron ore slag according to the weight ratio of 10:18:12: 9.
Wherein, the mass percent of CaO in the limestone is 49.22%.
The preparation method of the green environmental protection cement of this embodiment is the same as that of embodiment 4.
Comparative example
The cement of the comparative example is prepared by mixing cement clinker and mixed materials according to the weight ratio of 95:5, wherein the cement clinker is prepared from the following raw materials by weight: 150kg of limestone, 10kg of sandstone, 8kg of pyrite cinder and 5kg of coal gangue. The mixed material is formed by mixing limestone and desulfurized gypsum according to the weight ratio of 1: 1.5.
The preparation method of the cement of this comparative example comprises the following steps:
1) mixing and grinding the raw materials, screening to obtain raw materials, and homogenizing the raw materials;
2) preheating the homogenized raw material obtained in the step 1), then feeding the raw material into a decomposing furnace, wherein the top temperature of the decomposing furnace is 850 ℃, then calcining the raw material at 1450 ℃ for 40min, cooling and discharging the raw material to obtain cement clinker;
3) mixing and grinding the cement clinker prepared in the step 2) and the mixed material to obtain the cement clinker.
Test examples
The initial setting time and final setting time of the cements prepared in examples 1 to 6 and comparative example were measured according to the test method in JC/T453-2004 "physical test method for self-stressed cement", and the compressive strength thereof was measured according to the method in GB/T17671-1999 "test for Cement mortar Strength", the test results of which are shown in the following tables.
TABLE 1 Cement Performance test results in examples 1-6 and comparative examples
Figure BDA0002425914600000081
As can be seen from the above table, the initial setting time of the cement of the invention is short and can reach 88-98 min. The compression strength of the cement is very high, the 28d compression strength can reach 56.6-63.5MPa, and the cement has very good comprehensive performance. In addition, the cement clinker is added with construction waste during firing, thereby realizing waste utilization and being green and environment-friendly.

Claims (1)

1. A preparation method of green environment-friendly cement is characterized by comprising the following steps: the method comprises the following steps:
1) mixing and grinding the raw materials of the cement clinker to prepare a raw material, wherein the volume of 80 mu m sieve residues in the raw material is not more than 10 percent, and the volume of 200 mu m sieve residues is not more than 1.2 percent, then preheating and decomposing the raw material, wherein the decomposition temperature is 800-;
2) mixing and grinding the cement clinker prepared in the step 1) and the mixed material to obtain the cement clinker;
the cement clinker is mainly prepared from the following raw materials in parts by weight: 160 parts of limestone 150-one, 13-15 parts of sandstone, 4-5 parts of sulfuric acid slag, 8-10 parts of coal gangue, 3-5 parts of iron ore slag, 15-18 parts of construction waste, 3-5 parts of barium slag, 2-3 parts of copper slag, 8-10 parts of clay and 0.8-1 part of calcium zincate; the weight ratio of the cement clinker to the mixed material is 65-70:30-35, and the mixed material is formed by mixing limestone, fly ash and desulfurized gypsum according to the weight ratio of 10-12:16-18: 12-15; the construction waste comprises concrete waste; the limestone comprises the following components in percentage by weight: 49.22% of CaO, 3.76% of SiO2 and 2.63% of MgO; the pyrite cinder comprises the following components in percentage by weight: 41.72% of Fe2O3, 30.08% of SiO2, 5.75% of Al2O3, 7.22% of CaO and 0.82% of MgO; the coal gangue comprises the following components in percentage by weight: 60.8% of SiO2, 20.1% of Al2O3, 6.4% of Fe2O3, 4.8% of CaO, 1.1% of MgO, 2.0% of K2O and 0.6% of TiO 2; the iron slag comprises the following components in percentage by weight: 35-37% of SiO2, 5-6% of Al2O3, 27-29% of Fe2O3, 15-17% of CaO and 2.5-3.5% of MgO, wherein the loss on ignition is 6.36%; the construction waste comprises the following components in percentage by weight: 55.6 percent of SiO2, 12.5 percent of Al2O3, 16.7 percent of CaO and 3.7 percent of MgO; the copper slag comprises the following components in percentage by weight: 32.87% of SiO2, 34.75% of FeO, 6.61% of Fe2O3, 5.73% of Al2O3, 11.28% of CaO and 5.77% of MgO; the barium slag comprises the following components in percentage by weight: 41.25% of BaO, 11.98% of SO3, 15.73% of SiO2, 3.26% of Al2O3, 5.41% of CaO, 2.32% of MgO, and 1.18% of Fe2O 3; the clay comprises the following components in percentage by weight: 56.50% of SiO2, 22.82% of Al2O3, 10.78% of Fe2O3, 3.25% of K2O and 1.63% of CaO.
CN202010220537.4A 2020-03-25 2020-03-25 Green and environment-friendly cement and preparation method thereof Active CN111268929B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010220537.4A CN111268929B (en) 2020-03-25 2020-03-25 Green and environment-friendly cement and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010220537.4A CN111268929B (en) 2020-03-25 2020-03-25 Green and environment-friendly cement and preparation method thereof

Publications (2)

Publication Number Publication Date
CN111268929A CN111268929A (en) 2020-06-12
CN111268929B true CN111268929B (en) 2022-05-20

Family

ID=70993088

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010220537.4A Active CN111268929B (en) 2020-03-25 2020-03-25 Green and environment-friendly cement and preparation method thereof

Country Status (1)

Country Link
CN (1) CN111268929B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112851152B (en) * 2021-01-23 2022-10-21 登封市嵩基水泥有限公司 Cement clinker and cement prepared from lead-zinc smelting furnace slag and preparation method thereof
CN112851153A (en) * 2021-01-27 2021-05-28 黑龙江省宝泉岭农垦宝泉水泥有限公司 Environment-friendly cement and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102276177A (en) * 2010-07-29 2011-12-14 四川川恒化工股份有限公司 Method for producing cement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102276177A (en) * 2010-07-29 2011-12-14 四川川恒化工股份有限公司 Method for producing cement

Also Published As

Publication number Publication date
CN111268929A (en) 2020-06-12

Similar Documents

Publication Publication Date Title
CN111635152B (en) High belite sulphoaluminate cement clinker and preparation method thereof
CN111393043B (en) Cement produced by using inferior limestone and preparation method thereof
CN112608043B (en) High-strength nickel slag-based solid waste cementing material and preparation method thereof
CN110372240B (en) Preparation and use method of normal-temperature-curing low-price alkali-activated cement
CN113087420B (en) Stokehole modified steel slag and preparation method thereof
CN111689701B (en) Electric furnace steel slag-based cement admixture or concrete admixture, preparation method and application
CN109369044B (en) Sulphoaluminate cement and preparation method thereof
CN113185154B (en) Method for preparing cement clinker by using rare earth tailings
CN111268929B (en) Green and environment-friendly cement and preparation method thereof
CN111732352B (en) Low-alkali cement clinker, low-alkali high-strength cement and preparation method thereof
CN111187013A (en) Environment-friendly high-strength cement and preparation method thereof
CN108218269B (en) Nickel iron slag cementing material and preparation process thereof
CN113200698A (en) Preparation method of early strength additive for solid waste based cementing material
CN105621910A (en) Sulphate aluminum cement clinker and preparation method thereof and sulphate aluminum cement
CN111099847A (en) Method for producing cement clinker by using slag waste
CN112279529A (en) Method for improving silicon and aluminum content in sintered cement by using converter steel slag
CN115028395B (en) Solid waste building material product and preparation method thereof
CN114573318B (en) Special mixture for aerated concrete and preparation method thereof
CN115710095A (en) Boron-phosphorus composite modified high belite sulphoaluminate cement clinker and preparation method thereof
CN114835417A (en) Low-carbon cementing material prepared from industrial solid waste steel slag
CN114751668A (en) Early-strength ultrafine mineral admixture and preparation method thereof
CN114409281A (en) Method for producing cement clinker by using steel slag
CN111196689A (en) Energy-saving cement and preparation method thereof
CN111393044B (en) Energy-saving cement and preparation method thereof
CN110981232B (en) Steel slag doped adhesive and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant