CN114195414A - Carbon emission reduction method for production of cementing material - Google Patents

Carbon emission reduction method for production of cementing material Download PDF

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Publication number
CN114195414A
CN114195414A CN202210002871.1A CN202210002871A CN114195414A CN 114195414 A CN114195414 A CN 114195414A CN 202210002871 A CN202210002871 A CN 202210002871A CN 114195414 A CN114195414 A CN 114195414A
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carbon
green
production
cementing material
hydrogen
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Inventor
谭宏斌
马小玲
董发勤
杨飞华
王方流
夏彬
王毅飞
王进明
郑召
邓浩
邓秋林
赵骁锋
张吉秀
贺小春
吴浪
王进
王军霞
施淑颖
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Southwest University of Science and Technology
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Southwest University of Science and Technology
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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
    • C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
    • B28B11/245—Curing concrete articles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/48—Sulfur dioxide; Sulfurous acid
    • C01B17/50—Preparation of sulfur dioxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C04B7/36—Manufacture of hydraulic cements in general
    • 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
    • C04B7/42—Active ingredients added before, or during, the burning process
    • C04B7/421—Inorganic materials
    • C04B7/425—Acids or salts thereof
    • 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
    • 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
    • C04B7/4407—Treatment or selection of the fuel therefor, e.g. use of hazardous waste as secondary fuel ; Use of particular energy sources, e.g. waste hot gases from other processes
    • 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
    • C04B7/46—Burning; Melting electric
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • 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)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The patent discloses a carbon emission reduction method for producing a cementing material, which comprises the steps of uniformly mixing a calcium source, a silicon source and a stabilizer to obtain a raw material, preheating the raw material in a preheater of a kiln tail system, reacting to obtain an intermediate phase, feeding the intermediate phase into a rotary kiln, reacting the intermediate phase in the rotary kiln to obtain clinker, and cooling and grinding the clinker through a grate cooler to obtain the cementing material; and adding water and reinforcing fiber into the cementing material, and maintaining to obtain the high-strength artificial stone. Compared with the prior art, the method has the advantages of simple operation, low cost and obvious carbon reduction effect.

Description

Carbon emission reduction method for production of cementing material
Technical Field
The invention relates to the field of carbon neutralization in building material industry, in particular to fuel and raw material substitution for cement industry, and the method can also be used for producing gypsum-based cementing materials.
Background
The largest carbon dioxide emission in the building material industry is the cement industry, the cement industry is the third largest energy consumption industry in the world and occupies 7% of industrial energy consumption, and the cement industry is the second largest carbon dioxide emission industry in the world and occupies 7% of global carbon dioxide emission. In 2020, carbon emission of cement industry in China is about 13.2 hundred million tons (including power consumption), which accounts for 80% of the building material industry and 13.5% of the whole country. The cement industry has great influence on the building material industry in China to realize the aim of 'double carbon'. The main sources of carbon emissions from the cement industry are electricity consumption for production, fuel combustion and raw material carbonate decomposition. Calculated according to the relevant current national standard value, the carbon dioxide emission of each ton of cement is about 675 kilograms; wherein, the indirect emission of production power consumption accounts for about 11%, the direct emission of fuel combustion accounts for about 31%, the direct emission of raw material carbonate decomposition accounts for about 58% [ Qidong, Zhang Dai, Luoning ] building materials industry carbon neutralization [ J ]. Chinese building materials, 2021, (7): 92-97].
Hydrogen, as a commodity gas and chemical raw material with rich value, can become an energy storage carrier for renewable energy conversion. The water electrolysis technology is combined with the renewable energy power generation, redundant electric energy can be stored in hydrogen in a chemical energy mode, the fluctuation of renewable energy is stabilized, the consumption level is improved, and clean substitution of energy is promoted [ Xueyao, Li Gen base, Sun Tong, etc. ] key technology of hydrogen production by electrolysis under the goal of 'double carbon' and application progress [ J ]. global energy Internet, 2021, 4 (5): 436-446]. The green hydrogen prepared by utilizing renewable energy can be directly applied to the building material industry to replace carbonaceous fuel, and an effective way is provided for realizing deep carbon emission reduction.
Green carbon is a carbonaceous material in which carbon dioxide gas is solidified by plants or industrial processes, and can also be used as a substitute for carbonaceous fuel in the building material industry.
The raw materials of the cementing material adopt industrial waste residues and carbon-free raw materials, so that the low-carbon emission of the raw materials is realized; green electricity, green hydrogen and green carbon are used as energy sources, zero carbon emission of fuel and production power consumption is realized, and low carbon emission in the whole production process of the cementing material is realized; when the artificial stone is maintained, carbon generated in the production process of the cementing material is absorbed and cured, and zero emission of the carbon is realized.
Disclosure of Invention
Compared with the prior art, the method has the characteristics of simple operation, low cost, easy application in the existing kiln, and remarkable economic and social benefits.
A carbon emission reduction method for producing a cementing material comprises the following steps:
uniformly mixing a calcium source, a silicon source and a stabilizer to obtain a raw material, preheating the raw material in a preheater of a kiln tail system, reacting to obtain an intermediate phase, then feeding the intermediate phase into a rotary kiln, reacting the intermediate phase in the rotary kiln to obtain clinker, and cooling and grinding the clinker by a grate cooler to obtain a cementing material; adding water and reinforcing fiber into the cementing material, and curing to obtain the high-strength artificial stone; wherein the calcium source is one of carbide slag, marble powder and industrial gypsum; the silicon source is one of manganese slag, red mud and construction waste, and the addition amount is 30-60% of the mass of the calcium source; the stabilizer is one of apatite, barite and boromagnesite, and the addition amount of the stabilizer is 1.0-5.0% of the mass of the calcium source; the preheater is formed by vertically connecting cyclone cylinders in series, and a ceramic green electric heating element is arranged in a flue gas pipeline and a cyclone cylinder body in the preheater; the fuel adopted in the rotary kiln is sprayed in through a spray pipe, and the fuel is one of green hydrogen and green carbon.
The cooling medium adopted by the grate cooler is a mixed gas of carbon dioxide and oxygen.
The reinforcing fiber is one of basalt fiber, glass fiber and mullite whisker, and the adding amount of the reinforcing fiber is 10-50% of the mass of the calcium source.
And the maintenance adopts carbon dioxide maintenance.
The ceramic green electric heating element is a hollow ceramic plate with a green electric heating element therein, wherein the hollow ceramic plate is one of mullite ceramic and cordierite ceramic, and the green electric heating element is one of iron-chromium-aluminum alloy wire, tungsten wire and molybdenum wire.
The green hydrogen is one of green electrolysis water hydrogen production, photolysis water hydrogen production and nuclear energy hydrogen production.
The green carbon is one of biomass carbon and solidified carbon.
Compared with the prior art, the invention has the following advantages:
the calcium source is one of carbide slag, marble powder and industrial gypsum. The carbide slag is waste slag which is obtained by hydrolyzing carbide to obtain acetylene gas and takes calcium hydroxide as a main component. The marble micro powder is micro powder generated in the processing process of marble. The industrial gypsum is one of phosphogypsum, desulfurized gypsum, titanium gypsum and mirabilite gypsum, and sulfur oxide flue gas generated by decomposing the industrial gypsum is used for producing sulfuric acid or sulfur, so that the sulfur resource is recycled. The industrial waste residue is used as a calcium source, and has the advantage of resource recycling. Carbon dioxide generated by decomposing the marble powder is absorbed in the maintenance process of the artificial stone.
The silicon source is one of manganese slag, red mud and construction waste, and the slag can provide silicon resources required by the cementing material. The manganese slag is obtained by a wet-process manganese smelting process, namely, slag left after sulfuric acid is used for leaching manganese-containing ores to obtain electrolyte. The red mud is industrial solid waste discharged after extracting aluminum oxide in the aluminum production industry. The construction waste refers to waste generated in the process of building, laying, dismantling and repairing various buildings and structures. The industrial waste residue is used as a silicon source, and has the advantage of resource recycling.
The stabilizing agent is one of apatite, barite and boromagnesite, the stabilizing agent contains phosphorus, barium and boron elements which can enable alpha-dicalcium silicate to exist stably at room temperature, and the early hydration activity of the cementing material is improved, according to the detection of the national standard ' portland cement clinker ' (GB/T21372 '), the 3-day compressive strength of the cementing material is more than 40MPa, and other indexes of the cementing material also meet the standard requirements. The cementing material has the characteristic of sulfate resistance, and meets the requirements of national standard 'sulfate-resistant portland cement (GB 748)'.
The preheater is composed of vertical cyclones connected in series, and ceramic green electric heating elements are arranged in the ascending pipeline and the cyclone cylinder. The ceramic green electric heating element is formed by installing the green electric heating element in a hollow ceramic plate, wherein the ceramic is one of mullite ceramic and cordierite ceramic, the surface of the ceramic is microcrystalline cast stone, and materials are not deposited and adhered on the ceramic surface; the two ceramics have the characteristic of good thermal shock performance, and are beneficial to prolonging the service life of the ceramic green electric heating element. The green electric heating element is one of iron-chromium-aluminum alloy wire, tungsten wire and molybdenum wire. The green electric heating element is sealed and placed in the hollow part inside the ceramic plate, and is not contacted with materials and smoke, so that the service life is prolonged, and the continuous service life is longer than 300 days. The heating temperature of the ceramic green electric heating element is adjustable and is 100-1000 ℃; the green electricity is one of solar energy, wind energy, water energy, tidal energy, nuclear energy and geothermal energy for power generation.
In the patent, different ceramic and green electric heating elements are used to achieve the purpose of the invention.
Compared with the traditional cement production line, the cement pre-heater has no decomposing furnace, the materials are decomposed in the pre-heater, the investment can be reduced, and the production efficiency is improved. The raw material is preheated and decomposed and directly heated by green electricity, so that the loss of converting electric energy into other energy sources can be reduced, the production cost is reduced, and the energy utilization efficiency is improved.
The green hydrogen is one of green electrolysis water hydrogen production, photolysis water hydrogen production and nuclear energy hydrogen production, and the hydrogen can obtain the same effect in the invention. The water electrolysis method is one of alkaline solution electrolysis water, solid polymer membrane electrolysis water and high-temperature steam solid electrolyte electrolysis water. The hydrogen is produced by photolyzing water, which means that the hydrogen is produced by catalyzing and decomposing water by utilizing a photocatalysis technology, water is a very stable compound, and the reaction process is realized by the combined action of light and a semiconductor photocatalyst. The nuclear energy hydrogen production is one of an iodine-sulfur circulation method and a mixed sulfur circulation method. As can be seen, the hydrogen is green hydrogen and renewable. The hydrogen generates active atoms during combustion, the combustion is a chain reaction, and the combustion speed is high. The atomic absorbent is added into the hydrogen to absorb the hydrogen atoms, so that the activation center is reduced, the combustion speed of the hydrogen is slowed down, and the flame regulation and control are facilitated. The atom absorbent is one of heavy oil, coal tar and cracking residue. The heavy oil is the residual heavy oil after extracting gasoline and diesel oil from crude oil, and is characterized by large molecular weight and high viscosity. The coal tar is a black or black brown viscous liquid with irritant odor generated during coal dry distillation. The cracking residue is generated in the process of cracking and regenerating the waste mineral oil. The atom absorbent can react with hydrogen atoms to realize hydrogenation, and after the atom absorbent is subjected to hydrogenation reaction, the viscosity is reduced, the fluidity is increased, the dispersion in a combustion zone is facilitated, the mixing with other fuels is facilitated, and the flame stabilization is facilitated. In the burner, hydrogen is the carrier gas for the atomic absorber.
The green carbon is one of biomass carbon and solidified carbon. The biomass carbon is one of straw powder, sludge powder, farm waste and wood processing waste powder, the straw is waste generated in the planting industry, the sludge powder is powder obtained by drying and grinding sludge generated in the urban domestic sewage treatment process, and the farm waste is powder obtained by drying and grinding animal excrement. Green carbon is biomass waste, and is utilized to avoid environmental pollution.
The solidified carbon is a carbonaceous fuel obtained by solidifying carbon dioxide by an industrial method, the carbon dioxide can be recycled by the solidified carbon, and the external energy adopted in the carbon solidification process is green electricity. The industrial carbon fixation method is one of carbon dioxide electrolysis and plasma decomposition. The electrolyte for electrolyzing the carbon dioxide is one of potassium carbonate solution and yttria-stabilized zirconia, and the potassium carbonate solution is the electrolyte to obtain a reduction product which is one of formic acid and ethanol; yttria stabilized zirconia is used as electrolyte to obtain carbon monoxide gas. The plasma discharge decomposes the carbon dioxide, the decomposition product being carbon monoxide. One of dielectric barrier discharge and microwave discharge is adopted for plasma decomposition, one of catalysts g-C3N 4, TiO2, ZnO and MgO is added into a plasma discharge device, and the conversion rate of carbon dioxide can reach 50%.
In the patent, different green hydrogen or green carbon is used as fuel, so that the purpose of the invention can be achieved.
The temperature of the materials in the rotary kiln is 1200-1400 ℃, which is lower than 1450 ℃ in the traditional production of the Portland cement, thus being beneficial to reducing the consumption of fuel and improving the production efficiency.
The cooling medium adopted by the grate cooler is a mixed gas of carbon dioxide and oxygen, and the cooling medium does not generate nitrogen oxide in the production process of the cementing material; at present, the cooling medium adopted by the grate cooler in the cement industry is air, and the air contains nitrogen, so that nitrogen oxides are easily formed in a rotary kiln, and the environment is polluted. The patent uses the mixed gas of carbon dioxide and oxygen as a cooling medium, has high cooling efficiency which is more than 800 ℃/min, is beneficial to the stabilization of high-activity dicalcium silicate crystals, and improves the early strength of the cementing material; the cooled and utilized carbon dioxide is discharged from the preheater and then circularly returned to the grate cooler for utilization; the redundant carbon dioxide in the cementing material production system is used for maintaining the artificial stone, and water vapor in the flue gas is condensed and then used as external water for cementing material forming, so that the flue gas is not discharged. The oxygen in the cooling medium, namely the mixed gas, provides oxygen for the combustion of the green hydrogen and the green carbon.
The reinforced material is one of basalt fiber, glass fiber and mullite whisker, and the reinforced materials have the characteristic of stability under neutral and acidic conditions, so that the defect that carbon dioxide curing corrodes reinforcing steel bars in reinforced concrete is avoided. The reinforced materials are all produced by green electricity, and have the characteristic of no carbon emission.
Carbon dioxide curing, namely carbonization curing, adopts carbon dioxide as gas, the concentration of the carbon dioxide is 1-30%, the gas pressure is 0.1-1MPa, the curing time is 1-7 days, and the curing temperature is 10-20 ℃. The carbon dioxide can promote the hydration reaction of clinker minerals, and is beneficial to improving the early strength of the artificial stone; part of clinker minerals react with carbon dioxide to obtain calcium carbonate, and carbon dioxide gas can be solidified, which is beneficial to reducing greenhouse gas emission.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Uniformly mixing a calcium source, a silicon source and a stabilizer to obtain a raw material, preheating the raw material in a preheater of a kiln tail system, reacting to obtain an intermediate phase, then feeding the intermediate phase into a rotary kiln, reacting the intermediate phase in the rotary kiln to obtain clinker, and cooling and grinding the clinker by a grate cooler to obtain a cementing material; and adding water and reinforcing fiber into the cementing material, and maintaining to obtain the high-strength artificial stone. The formulations of calcium source, silicon source, stabilizer, reinforcing fiber, and 3-day compressive strength of the cement are shown in Table 1.
Figure DEST_PATH_IMAGE001
The embodiment of the invention can be implemented and can achieve the aim of the invention, and the compressive strength of the artificial stone is more than 120MPa in 2 days. The present invention is not limited to these examples.

Claims (7)

1. The carbon emission reduction method for producing the cementing material is characterized by sequentially comprising the following steps of: uniformly mixing a calcium source, a silicon source and a stabilizer to obtain a raw material, preheating the raw material in a preheater of a kiln tail system, reacting to obtain an intermediate phase, then feeding the intermediate phase into a rotary kiln, reacting the intermediate phase in the rotary kiln to obtain clinker, and cooling and grinding the clinker by a grate cooler to obtain a cementing material; adding water and reinforcing fiber into the cementing material, and curing to obtain the high-strength artificial stone; wherein the calcium source is one of carbide slag, marble powder and industrial gypsum; the silicon source is one of manganese slag, red mud and construction waste, and the addition amount is 30-60% of the mass of the calcium source; the stabilizer is one of apatite, barite and boromagnesite, and the addition amount of the stabilizer is 1.0-5.0% of the mass of the calcium source; the preheater is formed by vertically connecting cyclone cylinders in series, and a ceramic green electric heating element is arranged in a flue gas pipeline and a cyclone cylinder body in the preheater; the fuel adopted in the rotary kiln is sprayed in through a spray pipe, and the fuel is one of green hydrogen and green carbon.
2. The carbon emission reduction method for producing the cementing material according to claim 1, wherein the cooling medium adopted by the grate cooler is a mixed gas of carbon dioxide and oxygen.
3. The method for reducing carbon emission in production of the cementing material according to claim 1, wherein the reinforcing fiber is one of basalt fiber, glass fiber and mullite whisker, and the addition amount is 10-50% of the mass of the calcium source.
4. The method for reducing carbon emissions in the production of cementitious material as claimed in claim 1, wherein said curing is carbon dioxide curing.
5. The method of claim 1, wherein the green ceramic plate is one of mullite ceramic and cordierite ceramic, and the green electric heating element is one of iron-chromium-aluminum alloy wire, tungsten wire and molybdenum wire.
6. The method for carbon emission reduction in the production of gel materials as claimed in claim 1, wherein the green hydrogen is one of green electrolysis water hydrogen production, photolysis water hydrogen production and nuclear energy hydrogen production.
7. The method for reducing carbon emissions from cementitious material production as claimed in claim 1, wherein said green carbon is one of biomass carbon and cured carbon.
CN202210002871.1A 2022-01-05 2022-01-05 Carbon emission reduction method for production of cementing material Pending CN114195414A (en)

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