CN114524630B - Method for using aluminium ash as fuel, correcting material and sintering aid for dry cement production - Google Patents
Method for using aluminium ash as fuel, correcting material and sintering aid for dry cement production Download PDFInfo
- Publication number
- CN114524630B CN114524630B CN202210084650.3A CN202210084650A CN114524630B CN 114524630 B CN114524630 B CN 114524630B CN 202210084650 A CN202210084650 A CN 202210084650A CN 114524630 B CN114524630 B CN 114524630B
- Authority
- CN
- China
- Prior art keywords
- aluminum ash
- aluminum
- dry cement
- fuel
- combustion
- 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
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
- C04B7/36—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
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- 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
- C04B7/4423—Waste or refuse used as fuel
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A method for using aluminum ash as fuel, correcting material and sintering aid for dry cement production comprises the following steps: mixing aluminum ash and catalytic combustion accelerant in a conveying pipeline or a combustor, spraying the mixture into a kiln tail decomposing furnace and/or a kiln head rotary kiln of a dry cement production line through a spraying pipe or the combustor, quickly burning out under the catalytic activation action of the catalytic combustion accelerant in a high-temperature environment and in a suspension state, directly supplying heat energy generated by combustion to the decomposition of calcium carbonate and/or the burning of clinker, directly using active aluminum oxide generated by combustion as an aluminum correction raw material of the raw material, and directly using halide and other raw materials contained in the aluminum ash and catalytic elements after work as a burning aid for the burning of the raw material and/or the burning of the clinker. The invention can effectively and comprehensively utilize the aluminum ash, can reduce the cost of cement production raw combustion materials, and can utilize the cement kiln to cooperatively treat dangerous wastes to protect the ecological environment; simple operation, easy implementation, less investment and capability of absorbing various aluminum ashes in a large-scale mode.
Description
Technical Field
The invention relates to a method for comprehensively utilizing industrial waste residue aluminum ash in a harmless, recycling and energy-recycling manner, in particular to a method for using the aluminum ash as a fuel, a correcting material and a sintering aid for dry cement production.
Background
The aluminum ash is mainly obtained from the processes of aluminum ingot casting of electrolytic aluminum enterprises, aluminum processing and casting of aluminum profile enterprises and scrap remelting of secondary aluminum enterprises, and is solid waste slag generated in the aluminum smelting and processing processes.
In 2020, the yield of primary aluminum (electrolytic aluminum) in China is 3708 ten thousand tons, the capacity is increased by 5.6 percent compared with that in 2019, 110 kg of aluminum ash is generated once every 1t of aluminum is produced, and therefore the emission of the aluminum ash is increased day by day. The aluminum ash production amount is nearly 350 ten thousand tons in 2019 years in China, and the annual growth rate is nearly 2 percent.
The aluminum ash is divided into primary aluminum ash and secondary aluminum ash according to different generation modes.
The aluminum ash has complex components, the main chemical compositions of the aluminum ash are Al, Si, Mg, Ca and the like, and the aluminum ash also contains F, Cl, heavy metals, cyanides and other toxic and harmful substances; the main phases are aluminum nitride, fluoride salt, chloride salt, alumina, metallic aluminum, magnesia-alumina spinel, periclase, quartz, aluminum carbide, electrolyte, salt flux and the like. The aluminum nitride in the aluminum ash is resistant to high temperature and oxidation and is not easy to burn, and the aluminum nitride is easy to generate hydrolysis reaction when contacting water or affected by a damp environment to release odorous toxic gases such as ammonia gas and cyanide, so that the air is polluted and potential safety hazards are brought; meanwhile, the electrolyte in the aluminum ash can release free fluorine, and safety risk can be brought to the surrounding environment. In 2016, it is listed in the national records of dangerous waste, category HW 48.
The bulk density of the aluminum ash is 0.828-1.118 g/cm 3 An apparent density of 2.396-2.528 g/cm 3 The pH value of the leaching solution is 9.03-10.1.
In order to overcome the defects of the resource utilization of the aluminum ash at present, research technicians at home and abroad have carried out related researches. Currently, the aluminum ash resource utilization technology can be divided into a primary aluminum ash utilization technology and a secondary aluminum ash utilization technology:
1. resource utilization technology for primary aluminum ash
The existing primary aluminum ash utilization methods comprise an ash frying method, a squeezing method, a ball milling and screening method, a centrifugal separation method, an electrochemical method and the like, and mainly aim at extracting metal aluminum with higher content and value in primary aluminum ash, wherein the method for extracting aluminum from aluminum ash with wider application is the squeezing method, but the method cannot be completely and efficiently utilized due to the influence of the factors that the environmental protection does not reach the standard or the equipment application is limited, the recovery rate of the metal aluminum is lower and the like.
2. Secondary aluminum ash resource utilization technology
(1) And (3) gravity separation aluminum extraction: for example, CN201911367926.3 discloses a method for extracting aluminum oxide from secondary aluminum ash, which comprises grinding, washing with water, drying, adding molten sodium carbonate for reaction, adding hydrochloric acid to remove impurities, washing with alkali to remove impurities to obtain aluminum hydroxide precipitate, and calcining at high temperature to obtain aluminum oxide. The method has a complex process flow, and the extraction efficiency is not high because the aluminum ash contains more impurity components.
(2) And (3) as a converter and molten iron desulfurizing agent: the secondary aluminum ash contains a large amount of Al 2 O 3 A certain amount of limestone can be added to be used as a novel desulfurizer for the industrial boiler, but the use amount is limited due to more harmful substances in the secondary aluminum ash.
(3) Used as a steel-making refining agent: the calcium aluminate refining agent is prepared from the aluminum ash and is used for removing harmful element sulfur in high-quality steel, but the process is complex, the energy consumption is high, and large-scale application is not realized.
(4) Preparing aluminum sulfate: the aluminum ash and the sulfuric acid react to prepare the aluminum sulfate, and the defects are that the additional value of the produced aluminum sulfate is low, harmful gas is generated in the preparation process, and secondary pollution is caused to the environment.
(5) Preparation of polyaluminium sulfate: firstly preparing aluminum sulfate, and then adding a plurality of polymerization agents to carry out polymerization reaction to prepare polyaluminum sulfate as a flocculating agent, but the process is complicated.
(6) Preparing a refractory material: for example, CN 202010075954.4 discloses a method for producing a refractory material by performing innocent treatment on secondary aluminum ash, grinding the secondary aluminum ash, performing oxidative calcination at 1150 ℃ to 1550 ℃ to obtain alumina, volatilizing fluoride and chloride in the secondary aluminum ash at high temperature, and arc-melting the calcined oxide to obtain an aluminum-magnesium refractory material. But the oxidation resistance of the refractory material is not high due to the existence of salt impurities.
(7) The secondary aluminum ash can also be used for producing magnesia-alumina spinel, ceramic tiles with clear water, adsorbents, molecular sieves and the like. However, the technology has the defects of high production cost, complex process and the like, so that the current industrialization level is not high.
On the other hand, because of the excess capacity and the policy of energy conservation and emission reduction of double carbon in the novel dry-process rotary kiln cement clinker production line in China, the cement clinker production line with high energy consumption and high cost is eliminated, and the reasons of high energy consumption and high production cost mainly come from the aspects of raw materials, fuels, process control, equipment and the like, especially whether the raw materials and the fuels can be continuously and stably supplied or not, whether the component fluctuation energy is controlled in a reasonable range or not, and the method plays a crucial role in stable production. Many cement clinker lines have to use high-priced bauxite due to the lack of high-grade aluminum calibration raw materials. In addition, in the recent period, due to the fact that the price of power coal is greatly increased, a plurality of industrial enterprises have the situation of brake-off electricity limiting or production stopping, so that cement enterprises are also configured with a part of bituminous coal, high-sulfur coal and anthracite which have low heat value and are relatively cheap so as to reduce the generation cost, the coal powder combustion speed and the flame temperature are easily reduced, the stable operation of a kiln system is greatly influenced, and the clinker sintering yield and quality are influenced.
The aluminum ash contains partial high-heat-value metal aluminum and aluminum nitride, which are not effectively utilized (the heat value of the metal aluminum is 30222.22kJ/kg, and the generated heat of the aluminum nitride is about 10111 kcal/kg), particularly the content of the metal aluminum in the primary aluminum ash can reach 15% -70%, the most of the existing disposal methods are used for extracting aluminum, and the content of the metal aluminum in the secondary aluminum ash after aluminum extraction is still 8% -20%; secondly, because of the hazardous waste property of the aluminum ash, the aluminum oxide in the primary aluminum ash and the secondary aluminum ash is not fully and effectively utilized.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a method for recycling aluminum ash as fuel, correction material and combustion improver for dry cement production, which has the advantages of low investment, low treatment cost, high utilization rate, simple process and high efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for using aluminium ash as fuel, correcting material and combustion aid for dry cement production, mix aluminium ash and catalytic combustion promoter in the transfer piping, or mix in the burner, spray into kiln tail decomposing furnace of the dry cement production line through the injection pipe or burner, burn out rapidly under the condition of suspending in the high temperature environment of 850-1200 duC within 3-8 seconds under the catalytic activation of the catalytic combustion promoter, the heat energy produced by burning supplies the decomposition of calcium carbonate directly, the active alumina produced by burning is regarded as the aluminium correcting raw material of the raw meal directly, halide fluorine chlorine and other raw materials that contain in the aluminium ash and catalytic element after doing work are regarded as the combustion aid that the raw meal calcines together directly, in order to reduce the heat consumption of firing of the clinker in the rotary kiln; and/or mixing the aluminum ash and the catalytic combustion accelerant in a conveying pipeline, spraying the mixture into a kiln head rotary kiln of a dry cement production line through a spraying pipe or a burner, quickly burning out the mixture in a high-temperature environment of 1650-2200 ℃ within 1-3 seconds under the catalytic activation action of the catalytic combustion accelerant, directly burning the clinker by using heat energy generated by combustion, directly using active alumina generated by combustion as an aluminum correction raw material of a raw material, and directly using halide fluorine chlorine and other raw materials contained in the aluminum ash and catalytic elements after work as a burning aid for burning the clinker so as to reduce the burning heat consumption of the clinker in the rotary kiln.
Further, the aluminum ash is preferably primary aluminum ash or/and secondary aluminum ash treated by a salt-free process, and secondary aluminum ash treated by a salt-melting process can also be adopted.
Further, the adding amount of the aluminum ash is 0.3-3% of the mass of the raw material powder in the dry-method rotary kiln cement clinker production line, and preferably 0.5-2.5%; the addition amount of the secondary aluminum ash treated by the molten salt process is 0.1-1.5% of the mass of the raw material, and the content of chloride ions in the clinker is preferably controlled not to exceed 0.06%.
The salt-free process treatment refers to a process for treating primary aluminum ash by using methods such as plasma melting and the like (a high-temperature salt-free and low-temperature salt-free aluminum ash treatment method), and salt flux is not used in the whole process, so that the environmental hazard is small, the salt content in secondary aluminum ash is low, and the addition proportion is relatively high.
The molten salt process treatment refers to a process method of adding a salt flux with a certain proportion (a high-temperature salting aluminum ash treatment method) in the primary aluminum ash treatment process, and recovering aluminum by utilizing the reaction of the salt flux and the aluminum ash, wherein the salt content of the generated secondary aluminum ash is high, so that the adding proportion of the secondary aluminum ash is relatively low.
Further, the amount of the catalytic combustion accelerant is 0.5-5% of the mass of the aluminum ash.
Furthermore, the fineness of the aluminum ash is 150-500 meshes, and preferably 180-325 meshes.
Further, the water content of the aluminum ash is less than or equal to 1.5 percent.
Further, the catalytic combustion accelerant is a water-soluble ionic solution compound containing rare earth elements such as cerium and the like and catalytic activation elements such as lithium, boron and the like.
Further, the specific operation steps of mixing the aluminum ash and the catalytic combustion promoter in the conveying pipeline or in the combustor are as follows: the aluminum ash containing the catalytic combustion accelerant is continuously fed into a conveying pipeline for mixing or a combustor for mixing by an air-locking feeding mechanism.
Further, the atmosphere in the kiln system of the novel dry-method cement clinker production line is oxidizing atmosphere, and the air surplus coefficient is 1.02-1.2.
The technical principle and the beneficial effects of the invention are as follows: (1) the catalytic oxidation clean combustion technology is adopted, and the high-temperature environment of a cement kiln burning system is utilized to enable combustible components in the aluminum ash to be rapidly burnt to release heat and decomposed into active aluminum oxide and nitrogen; (2) by utilizing the compatibility in the clinker calcining production process of the novel dry-method cement clinker production line, various mineral components in the aluminum ash are effectively utilized, partial raw materials for cement clinker production such as aluminum, silicon, iron, calcium and the like can be saved, heavy metals can be completely solidified, the clinker quality and the cement performance are basically not influenced, and the cement clinker calcining production line is non-toxic and has no secondary pollution; (3) the method has the advantages of simple operation, easy implementation, low investment and large aluminum ash disposal amount, and a cement clinker production line with the capacity of 5000t/d and normal operation can consume 8000-80000 tons of aluminum ash every year according to the characteristics of the aluminum ash, thereby having great significance for promoting the recycling of solid waste, dangerous waste and the like in China.
In summary, the invention can effectively and comprehensively utilize metal aluminum, aluminum nitride and aluminum oxide in the aluminum ash as alternative fuel, aluminum correction material and sintering aid for dry cement production, thereby not only reducing the cost of cement production raw combustion materials, but also utilizing a cement kiln to cooperatively dispose hazardous wastes and protecting the ecological environment; the method has the advantages of simple and convenient operation, easy implementation, less investment and large aluminum ash disposal amount, and can absorb various aluminum ashes in a large-scale manner.
Detailed Description
The present invention will be further described with reference to the following examples.
The catalytic combustion accelerator used in the following examples of the present invention is a water-soluble ionic solution complex containing rare earth elements such as cerium and catalytic activation elements such as lithium and boron, and is purchased from the environmental energy science and technology development company, not contraindicated, of the minor in Hunan province.
Other starting materials are conventionally obtained commercially unless otherwise specified.
Example 1
Taking secondary aluminum ash generated by certain molten salt process treatment, wherein the main chemical component (the content is mass percent, the same below) of the secondary aluminum ash is Al 2 O 3 62.0%，Al 15.4%，AlN 1.52%，F 1.33%，SiO 2 8.3%，Na 2 5.21 percent of O, 3.84 percent of MgO and 2.4 percent of the rest, which are used as a kiln tail alternative fuel, a correcting material and a sintering aid of a novel dry-process rotary kiln cement clinker production line; simultaneously, the primary aluminum ash produced by certain electrolytic aluminum enterprises is taken, and the main chemical component of the primary aluminum ash is Al 2 O 3 41.86%，Al 34.73%，AlN 5.86%，F 0.72%，SiO 2 8.36%，Na 2 5.31 percent of O, 2.87 percent of MgO and 0.29 percent of the rest, which are used as a kiln head alternative fuel, a correcting material and a sintering aid of a novel dry-process rotary kiln cement clinker production line, and the aluminum ash resource utilization test is carried out by utilizing the novel dry-process rotary kiln cement clinker production line with the factory productivity of 5000t/d, and the existing physical coal consumption is 121kg/t clinker.
The operation steps of this embodiment are as follows: in the normal state of production and operation of a kiln system, secondary aluminum ash and a catalytic combustion accelerant are mixed in a conveying pipeline and are sprayed into a kiln tail decomposing furnace of a dry cement production line through a burner, the secondary aluminum ash and the catalytic combustion accelerant are quickly burnt out under the condition of suspension in a high-temperature environment of 920 ℃ within 7 seconds under the catalytic activation action of the catalytic combustion accelerant, heat energy generated by combustion is directly supplied for decomposition of calcium carbonate, active aluminum oxide generated by combustion is directly used as an aluminum correction raw material of a raw material, halide fluorine-chlorine and other raw materials contained in the aluminum ash and a catalytic element after work are directly used as a combustion aid for raw material calcination, and the combustion heat consumption of clinker in a rotary kiln is reduced.
In another embodiment: mixing primary aluminum ash and a catalytic combustion accelerant in a burner, spraying the mixture into a kiln head rotary kiln of a dry cement production line through a coal powder burner, quickly burning out the mixture in a high-temperature environment of 1850 ℃ within 3 seconds under the catalytic activation action of the catalytic combustion accelerant, directly burning clinker by using heat energy generated by combustion, directly using active alumina generated by combustion as an aluminum correction raw material of raw materials, directly using halide fluorine-chlorine and other raw materials contained in the aluminum ash and catalytic elements after work doing as combustion aids for burning the clinker, and reducing the burning heat consumption of the clinker in the rotary kiln.
The fineness of the secondary aluminum ash is 220 meshes, and the water content of the secondary aluminum ash is 1.4%; the fineness of the primary aluminum ash is 200 meshes, and the water content of the primary aluminum ash is 0.9%.
The using amount of the kiln tail catalytic combustion accelerant is 2.6 percent of the mass of the aluminum ash, and the adding amount of the secondary aluminum ash is 0.8 percent of the mass of the raw material.
The using amount of the kiln head catalytic combustion accelerant is 0.4% of the mass of the aluminum ash, and the adding amount of the primary aluminum ash is 1% of the mass of the raw material.
The atmosphere in the kiln system of the novel dry-method cement clinker production line is oxidizing atmosphere, and the air surplus coefficient is 1.13.
During the test, factory feedback: the working condition of a kiln system is normal, the flame at the kiln head is white and bright and powerful, the black fire head is short, the weight of the clinker is increased equivalently, the coal consumption of a firing system is reduced by 7.92% in proportion (the heat consumption of the clinker is obviously reduced), the boiling stability of the clinker is qualified, the initial setting time is 121min, the final setting time is 184min, the water consumption of the standard consistency is 24.8%, the 3d strength of the clinker is 31.7MPa, the 28d strength is 61.4MPa, the heavy metal and chloride ion detection does not exceed the standard, and the emission monitoring of smoke pollutants is not abnormal. The test shows that the aluminum ash as the fuel, the correcting material and the sintering aid for dry cement production has obvious effect, simple method and no secondary pollution.
Example 2
Taking primary aluminum ash generated by certain electrolytic aluminum enterprises, wherein the main chemical component (mass percentage) of the primary aluminum ash is Al 2 O 3 39.53%，Al 37.21%，AlN 5.71%，F 1.34%，SiO 2 8.68%，Na 2 O3.74 percent, MgO 2.92 percent and the balance of 0.87 percent, and the aluminum ash resource utilization test is carried out by utilizing a novel dry-process rotary kiln cement clinker production line with the capacity of 5000t/d in a certain plant, and the existing real object coal consumption is 122kg/t clinker.
The operation steps of this embodiment are as follows: under the normal state of production and operation of a kiln system, primary aluminum ash and a catalytic combustion accelerant are mixed in a conveying pipeline and sprayed into a rotary kiln of a dry cement production line from a kiln head through a pulverized coal burner, the primary aluminum ash and the catalytic combustion accelerant are quickly burnt out under the catalytic activation action of the catalytic combustion accelerant within 2 seconds at the temperature of 1980 ℃, heat energy generated by combustion is directly used for burning clinker, active alumina generated by combustion is directly used as an aluminum correction raw material of a raw material, halide fluorine-chlorine and other raw materials contained in the aluminum ash and catalytic elements after work are directly used as a burning aid for burning the clinker, and the burning heat consumption of the clinker in the rotary kiln is reduced.
The fineness of the aluminum ash is 180 meshes, and the water content of the aluminum ash is 1.3%.
The dosage of the catalytic combustion accelerator is 0.7 percent of the mass of the aluminum ash, and the addition amount of the aluminum ash is 0.9 percent of the mass of the raw material.
The atmosphere in the kiln system of the novel dry-method cement clinker production line is oxidizing atmosphere, and the air surplus coefficient is 1.11.
During the test, factory feedback: the working condition of a kiln system is normal, the flame at the kiln head is white, bright and powerful, the black fire head is short, the weight of clinker is increased considerably, the coal consumption of a sintering system is reduced by 5.87% in proportion (the heat consumption of the clinker is reduced remarkably), the boiling stability of the clinker is qualified, the initial setting time is 113min, the final setting time is 175min, the water consumption for standard consistency is 22.9%, the 3d strength of the clinker is 33.4MPa, the 28d strength is 63.2MPa, the heavy metal and chloride ion detection does not exceed the standard, and the emission monitoring of smoke pollutants is abnormal. The test shows that the primary aluminum ash as the fuel, the correcting material and the combustion assistant for dry cement production has obvious effect, simple method and no secondary pollution.
Example 3
Taking secondary aluminum ash produced by a certain secondary aluminum enterprise, wherein the main chemical component (mass percentage) of the secondary aluminum ash is Al 2 O 3 70.56%，Al 3.7%，AlN 6.32%，F 1.41%，SiO 2 8.76%，Na 2 O2.47 percent, MgO 4.96 percent and the rest 1.82 percent, and the existing physical coal consumption is 112kg/t clinker by utilizing a novel dry-process rotary kiln cement clinker production line with the capacity of 5000t/d in a certain plant to carry out an aluminum ash resource utilization test.
The operation steps of this embodiment are as follows: in the normal state of production and operation of a kiln system, secondary aluminum ash and a catalytic combustion accelerant are mixed in a conveying pipeline and are sprayed into a kiln tail decomposing furnace of a dry cement production line through a burner, the secondary aluminum ash and the catalytic combustion accelerant are quickly burnt out under the condition of suspension in a high-temperature environment of 960 ℃ for 6 seconds under the catalytic activation action of the catalytic combustion accelerant, heat energy generated by combustion is directly supplied for decomposition of calcium carbonate, active aluminum oxide generated by combustion is directly used as an aluminum correction raw material of a raw material, halide fluorine-chlorine and other raw materials contained in the aluminum ash and a catalytic element after work are directly used as a combustion aid for raw material calcination, and the combustion heat consumption of clinker in a rotary kiln is reduced.
The fineness of the aluminum ash is 220 meshes, and the water content of the aluminum ash is 0.8%.
The dosage of the catalytic combustion accelerant is 3.2 percent of the mass of the aluminum ash, and the addition amount of the aluminum ash is 2.6 percent of the mass of the raw material.
The atmosphere in the kiln system of the novel dry-method cement clinker production line is oxidizing atmosphere, and the air surplus coefficient is 1.08.
During the test, factory feedback: the working condition of a kiln system is normal, the weight of the clinker is increased equivalently, the coal consumption of a firing system is reduced by 1.80 percent in the same ratio (the heat consumption of the clinker is reduced), the boiling stability of the clinker is qualified, the initial setting time is 121min, the final setting time is 164min, the water consumption of the standard consistency is 22.5 percent, the 3d strength of the clinker is 30.5MPa, the 28d strength is 59.2MPa, the heavy metal and chloride ion detection does not exceed the standard, and the emission monitoring of smoke pollutants is not abnormal. The test shows that the secondary aluminum ash has obvious effect as a fuel, a correcting material and a sintering aid for dry cement production, the method is simple, and no secondary pollution is caused.
Example 4
Taking secondary aluminum ash produced by certain aluminum profile enterprises, wherein the main chemical component (mass percentage) of the secondary aluminum ash is Al 2 O 3 57.6%，Al 19.5%，AlN 1.31%，F 1.24%，SiO 2 10.15%，Na 2 5.17 percent of O, 2.93 percent of MgO and 2.1 percent of the rest, and the existing physical coal consumption is 131kg/t of clinker by utilizing a novel dry-process rotary kiln cement clinker production line with the capacity of 2500t/d in a certain plant to carry out an aluminum ash resource utilization test.
Under the normal production and operation state of a kiln system, secondary aluminum ash and a catalytic combustion accelerant are mixed in a combustor and sprayed into a rotary kiln at the kiln head of a dry cement production line through the combustor, the secondary aluminum ash and the catalytic combustion accelerant are quickly burnt out under the catalytic activation action of the catalytic combustion accelerant within 2 seconds at 1860 ℃, heat energy generated by combustion is directly used for burning clinker, active alumina generated by combustion is directly used as an aluminum correction raw material of a raw material, halide fluorine-chlorine and other raw materials contained in the aluminum ash and catalytic elements after work are directly used as burning aids for burning the clinker, and the burning heat consumption of the clinker in the rotary kiln is reduced.
The fineness of the aluminum ash is 325 meshes, and the water content of the aluminum ash is 1.2%.
The dosage of the catalytic combustion accelerant is 0.6 percent of the mass of the aluminum ash, and the addition amount of the aluminum ash is 0.8 percent of the mass of the raw material.
The atmosphere in the kiln system of the novel dry-method cement clinker production line is oxidizing atmosphere, and the air surplus coefficient is 1.1.
Factory feedback during the test: the working condition of a kiln system is normal, the flame at the kiln head is white and bright and powerful, the black fire head is shortened, the weight of the clinker is increased equivalently, the coal consumption of a firing system is reduced by 2.18% in proportion (the heat consumption of the clinker is reduced to some extent), the boiling stability of the clinker is qualified, the initial setting time is 107min, the final setting time is 145min, the water consumption of the standard consistency is 23.3%, the 3d strength of the clinker is 28.2MPa, the 28d strength is 59.8MPa, the heavy metal and chloride ion detection does not exceed the standard, and the emission monitoring of smoke pollutants is not abnormal. The test shows that the secondary aluminum ash has obvious effect as a fuel, a correcting material and a sintering aid for dry cement production, the method is simple, and no secondary pollution is caused.
Example 5
Taking primary aluminum ash produced by certain electrolytic aluminum enterprises, wherein the main chemical component (mass percentage) of the primary aluminum ash is Al 2 O 3 43.78%，Al 31.32%，AlN 6.39%，F 0.42%，SiO 2 9.51%，Na 2 4.43 percent of O, 3.84 percent of MgO and 0.31 percent of the rest, and utilizes a novel dry-method rotary kiln cement clinker production line with the capacity of 3200t/d for carrying out an aluminum ash resource utilization test, wherein the existing material coal consumption of the cement clinker production line is 124kg/t clinker.
The operation steps of this embodiment are as follows: under the normal production and operation state of a kiln system, primary aluminum ash and a catalytic combustion accelerant are mixed in a conveying pipeline and are sprayed into a kiln tail decomposing furnace of a dry cement production line through a burner, the mixture is quickly burnt out under the condition of suspension within 4 seconds at the temperature of 885 ℃ under the catalytic activation action of the catalytic combustion accelerant, heat energy generated by combustion is directly supplied for decomposition of calcium carbonate, active alumina generated by combustion is directly used as an aluminum correction raw material of a raw material, halide fluorine-chlorine and other raw materials contained in the aluminum ash and catalytic elements after work are directly used as a combustion aid for raw material calcination, and the combustion heat consumption of clinker in a rotary kiln is reduced.
The fineness of the aluminum ash is 200 meshes, and the water content of the aluminum ash is 1.0%.
The dosage of the catalytic combustion accelerant is 0.9 percent of the mass of the aluminum ash, and the addition amount of the aluminum ash is 1.2 percent of the mass of the raw material.
The atmosphere in the kiln system of the novel dry-method cement clinker production line is oxidizing atmosphere, and the air surplus coefficient is 1.15.
Factory feedback during the test: the working condition of a kiln system is normal, the weight of the clinker is increased equivalently, the coal consumption of a firing system is reduced by 6.07 percent in the same ratio (the heat consumption of the clinker is obviously reduced), the boiling stability of the clinker is qualified, the initial setting time is 124min, the final setting time is 176min, the water consumption of the standard consistency is 24.2 percent, the 3d strength of the clinker is 29.1MPa, the 28d strength is 60.7MPa, the heavy metal and chloride ion detection does not exceed the standard, and the emission monitoring of smoke pollutants is not abnormal. The test shows that the primary aluminum ash as the fuel, the correcting material and the sintering aid for dry cement production has obvious effect, simple method and no secondary pollution.
Claims (17)
1. A method for using aluminum ash as fuel, correcting material and sintering aid for dry cement production is characterized by comprising the following steps: mixing aluminum ash and a catalytic combustion promoter in a conveying pipeline or a combustor, spraying the mixture into a kiln tail decomposing furnace of a dry cement production line through a spraying pipe or the combustor, quickly burning out the mixture under the suspension condition of 3-8 seconds at the high temperature of 850-1200 ℃ under the catalytic activation action of the catalytic combustion promoter, directly supplying heat energy generated by combustion to the decomposition of calcium carbonate, directly taking active alumina generated by combustion as an aluminum correction raw material of a raw material, and directly taking halide fluorine-chlorine and other raw materials contained in the aluminum ash and catalytic elements after work as combustion aids for raw material calcination together so as to reduce the heat consumption of clinker in a rotary kiln; and/or mixing the aluminum ash and the catalytic combustion accelerant in a conveying pipeline, spraying the mixture into a kiln head rotary kiln of a dry cement production line through a spraying pipe or a burner, quickly burning out the mixture in a high-temperature environment of 1650-2200 ℃ within 1-3 seconds under the catalytic activation action of the catalytic combustion accelerant, directly burning the clinker by using heat energy generated by combustion, directly using active alumina generated by combustion as an aluminum correction raw material of a raw material, and directly using halide fluorine-chlorine and other raw materials contained in the aluminum ash and catalytic elements after work as burning aids for burning the clinker so as to reduce the burning heat consumption of the clinker in the rotary kiln;
the catalytic combustion accelerant is a water-soluble ionic solution compound containing catalytic activation elements, rare earth elements, lithium and boron; the dosage of the catalytic combustion accelerant is 0.5-5% of the mass of the aluminum ash.
2. The method for using the aluminum ash as the fuel and the correction material as well as the sintering aid for the dry cement production according to claim 1, wherein the aluminum ash is primary aluminum ash, or secondary aluminum ash treated by a salt-free process, or secondary aluminum ash treated by a molten salt process.
3. The method for using the aluminum ash as the fuel, the correcting material and the combustion aid for the dry cement production according to claim 2, wherein the addition amount of the primary aluminum ash or the secondary aluminum ash treated by the salt-free process is 0.3-3% of the mass of the raw meal in the production line of the dry rotary kiln cement clinker, and the addition amount of the secondary aluminum ash treated by the salt melting process is 0.1-1.5% of the mass of the raw meal.
4. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to claim 3, wherein the addition amount of the primary aluminum ash or the secondary aluminum ash treated by the salt-free process is 0.5 to 2.5 percent of the mass of the raw material powder in the production line of the dry rotary kiln cement clinker.
5. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to any one of claims 1 to 4, wherein the fineness of the aluminum ash is 150-500 meshes.
6. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to claim 5, wherein the fineness of the aluminum ash is 180-325 meshes.
7. The method for producing the fuel, the correcting material and the sintering aid for the dry cement by using the aluminum ash according to any one of claims 1 to 4, wherein the water content of the aluminum ash is less than or equal to 1.5 percent.
8. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to claim 5, wherein the water content of the aluminum ash is less than or equal to 1.5 percent.
9. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to claim 6, wherein the water content of the aluminum ash is less than or equal to 1.5 percent.
10. The method for using aluminum ash as fuel and correction material and combustion promoter in dry cement production according to any one of claims 1 to 4, wherein the specific operation steps of mixing the aluminum ash and the catalytic combustion promoter in the conveying pipeline or in the combustor are as follows: the aluminum ash containing the catalytic combustion accelerant is continuously fed into a conveying pipeline for mixing or a combustor for mixing by an air-locking feeding mechanism.
11. The method for using aluminum ash as fuel and correction material and combustion promoter in dry cement production according to claim 5, wherein the specific operation steps of mixing aluminum ash and catalytic combustion promoter in a conveying pipeline or a combustor are as follows: the aluminum ash containing the catalytic combustion accelerant is continuously fed into a conveying pipeline for mixing or a combustor for mixing by an air-locking feeding mechanism.
12. The method for using the aluminum ash as the fuel and the correction material and the combustion improver for the dry cement production according to claim 6, wherein the specific operation steps of mixing the aluminum ash and the catalytic combustion promoter in a conveying pipeline or a combustor are as follows: the aluminum ash containing the catalytic combustion accelerant is continuously fed into a conveying pipeline for mixing or a combustor for mixing by an air-locking feeding mechanism.
13. The method for using aluminum ash as fuel and correction material and combustion promoter in dry cement production according to claim 7, wherein the specific operation steps of mixing aluminum ash and catalytic combustion promoter in a conveying pipeline or a combustor are as follows: the air-locking feeding mechanism is used for continuously feeding the aluminum ash containing the catalytic combustion accelerant into a conveying pipeline for mixing or a combustor for mixing.
14. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to any one of claims 1 to 4, wherein the atmosphere in the kiln system of the dry cement clinker production line is an oxidizing atmosphere, and the air excess coefficient is 1.02 to 1.2.
15. The method for using aluminum ash as fuel, correcting material and sintering aid for dry cement production according to claim 5, wherein the atmosphere in the kiln system of the dry cement clinker production line is oxidizing atmosphere, and the air excess coefficient is 1.02-1.2.
16. The method for using aluminum ash as fuel, correcting material and sintering aid for dry cement production according to claim 6, wherein the atmosphere in the kiln system of the dry cement clinker production line is oxidizing atmosphere, and the air excess coefficient is 1.02-1.2.
17. The method for using the aluminum ash as the fuel, the correcting material and the sintering aid for the dry cement production according to claim 7, wherein the atmosphere in the kiln system of the dry cement clinker production line is an oxidizing atmosphere, and the air excess coefficient is 1.02-1.2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084650.3A CN114524630B (en) | 2022-01-25 | 2022-01-25 | Method for using aluminium ash as fuel, correcting material and sintering aid for dry cement production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084650.3A CN114524630B (en) | 2022-01-25 | 2022-01-25 | Method for using aluminium ash as fuel, correcting material and sintering aid for dry cement production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114524630A CN114524630A (en) | 2022-05-24 |
| CN114524630B true CN114524630B (en) | 2022-09-30 |
Family
ID=81621153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210084650.3A Active CN114524630B (en) | 2022-01-25 | 2022-01-25 | Method for using aluminium ash as fuel, correcting material and sintering aid for dry cement production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114524630B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB173504A (en) * | 1920-12-24 | 1923-03-21 | Edouard Bouchaud Praceiq | Improvements in the preparation of pulverulent fuels for the purposes of converting their ashes into hydraulic cements |
| JPS57129316A (en) * | 1981-02-05 | 1982-08-11 | Masami Hirai | Utilization of aluminum ash for fuel and combustion furnace therefor |
| CN108585564A (en) * | 2018-07-16 | 2018-09-28 | 长沙中硅水泥技术开发有限公司 | The system and method for cement kiln synergic processing waste slag of electrolytic aluminium coproduction double-quick cement |
| CN112408821A (en) * | 2020-11-26 | 2021-02-26 | 淄博海慧工程设计咨询有限公司 | Method for producing high-iron sulphoaluminate cement by utilizing red mud and aluminum ash |
| CN113603375A (en) * | 2021-08-27 | 2021-11-05 | 中铝郑州有色金属研究院有限公司 | Alumina, mixed clinker for producing alumina and preparation method of mixed clinker |
-
2022
- 2022-01-25 CN CN202210084650.3A patent/CN114524630B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB173504A (en) * | 1920-12-24 | 1923-03-21 | Edouard Bouchaud Praceiq | Improvements in the preparation of pulverulent fuels for the purposes of converting their ashes into hydraulic cements |
| JPS57129316A (en) * | 1981-02-05 | 1982-08-11 | Masami Hirai | Utilization of aluminum ash for fuel and combustion furnace therefor |
| CN108585564A (en) * | 2018-07-16 | 2018-09-28 | 长沙中硅水泥技术开发有限公司 | The system and method for cement kiln synergic processing waste slag of electrolytic aluminium coproduction double-quick cement |
| CN112408821A (en) * | 2020-11-26 | 2021-02-26 | 淄博海慧工程设计咨询有限公司 | Method for producing high-iron sulphoaluminate cement by utilizing red mud and aluminum ash |
| CN113603375A (en) * | 2021-08-27 | 2021-11-05 | 中铝郑州有色金属研究院有限公司 | Alumina, mixed clinker for producing alumina and preparation method of mixed clinker |
Non-Patent Citations (1)
| Title |
|---|
| 铝灰替代部分高铝矾土制备铝酸盐水泥熟料的研究;钟文等;《水泥》;20180910(第09期);第9-13页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114524630A (en) | 2022-05-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102978659B (en) | A kind of Deep method of comprehensive utilization of electrolytic cell overhaul slag | |
| CN111732353B (en) | Method for treating sand-based waste incineration fly ash by using cement kiln in cooperation | |
| CN107720723B (en) | Method for comprehensively treating waste cell lining of aluminum electrolysis cell | |
| CN101357367B (en) | Method for processing waste cell-lining of aluminum cell using coal slack | |
| CN107401746B (en) | Treatment system and treatment method for aluminum electrolysis overhaul slag | |
| CN114105610A (en) | Aluminum ash-based porous ceramic material and preparation method thereof | |
| CN105964660B (en) | A kind of method of harmless treatment aluminium electrolytic tank | |
| CN110282877B (en) | Thermal insulation cotton prepared from ironmaking hot slag and waste incineration fly ash and preparation method thereof | |
| CN102989744B (en) | Method for recycling mixed material dreg of overhauling groove slag of electrolytic cell | |
| CN108545971A (en) | A kind of clinker and preparation method thereof | |
| CN111777344B (en) | Method for treating waste incineration fly ash as admixture by cooperation of cement kiln | |
| CN111594856A (en) | Aluminum ash harmless treatment method | |
| CN113943116A (en) | Process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration | |
| CN113683108A (en) | Method for preparing calcium aluminate product by using secondary aluminum ash | |
| CN112958587A (en) | Method and device for co-processing and utilizing aluminum ash and overhaul slag | |
| CN111607709A (en) | Method for performing harmless treatment on hazardous waste electrolytic aluminum ash | |
| CN111023101A (en) | Method for establishing kiln skin of hazardous waste incineration rotary kiln | |
| CN111250515A (en) | Method for burning and fixing fluorine of waste cathode carbon block of electrolytic aluminum and application thereof | |
| CN114524630B (en) | Method for using aluminium ash as fuel, correcting material and sintering aid for dry cement production | |
| CN107200488B (en) | Method for producing fluoroaluminate cement by using carbon waste of aluminum electrolytic cell in dry-process rotary kiln plant | |
| CN103028592B (en) | A kind of circulation utilization method of electrolytic cell overhaul slag recovery water | |
| CN113979775B (en) | Method for preparing ceramsite proppant by using secondary aluminum ash | |
| CN114524442B (en) | Method for recycling and clean utilization of aluminum ash in grinding station | |
| CN113566207B (en) | Method for reducing slag bonding contamination of boiler and cooperatively treating secondary aluminum ash hazardous waste | |
| CN114835504A (en) | Method for preparing wear-resistant and high-temperature-resistant microporous corundum-spinel castable |
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 |