CN113683108A - Method for preparing calcium aluminate product by using secondary aluminum ash - Google Patents
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- CN113683108A CN113683108A CN202111145386.1A CN202111145386A CN113683108A CN 113683108 A CN113683108 A CN 113683108A CN 202111145386 A CN202111145386 A CN 202111145386A CN 113683108 A CN113683108 A CN 113683108A
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- aluminum ash
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/16—Preparation of alkaline-earth metal aluminates or magnesium aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/164—Calcium aluminates
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for preparing a calcium aluminate product by using secondary aluminum ash. The method comprises the steps of mixing secondary aluminum ash, a calcium source and a binder consisting of waste engine oil and asphalt, pressing the mixture into pellets by a dry method, and oxidizing and roasting the pellets to obtain the aluminum-containing fuel. The method takes industrial hazardous solid waste secondary aluminum ash as a raw material and obtains a calcium aluminate product by oxidizing and roasting with a calcium source; the product can be used as a raw material of calcium aluminate cement or used for secondary recovery of alumina or used as a calcium aluminate desulfurizer in the steel smelting process, the method is simple to operate, no dust is generated in the roasting process, higher economic value can be obtained, and recovery of hazardous wastes and resource utilization are realized.
Description
Technical Field
The invention relates to a preparation method of a calcium aluminate product, in particular to a method for preparing the calcium aluminate product by taking secondary aluminum ash as a raw material and an external calcium source through a high-temperature solid-phase reaction, belonging to the technical field of metal regeneration and comprehensive utilization of solid wastes.
Background
The aluminum ash is derived from a hazardous waste generated in the production, recovery and reprocessing of electrolytic aluminum and secondary aluminum. In the production process of electrolytic aluminum, 2.5-4.5% of aluminum ash slag is additionally generated when one ton of electrolytic aluminum is produced, 13-18% of aluminum ash slag is generated when one ton of secondary aluminum is produced in the processing process of secondary aluminum and aluminum alloy, and the total amount of the aluminum ash slag generated in China every year is more than 300 ten thousand tons.
The secondary aluminum ash is fine ash with the granularity within 100 meshes generated after the aluminum ash slag is subjected to ball milling to recover metal aluminum, and the main components and the contents (mass fraction) of the secondary aluminum ash are as follows: metal aluminum (2-15%), alumina (30-80%), aluminum nitride (3-20%), magnesia-alumina spinel (10-40%), salt and other impurities (5-30%). The aluminum ash is easy to generate corrosive or combustible gas in the stacking process, and brings great harm to the environment if the aluminum ash is not safely treated.
At present, the harmless treatment of the secondary aluminum ash comprises a wet method and a fire method. The wet harmless treatment mainly comprises three methods of acid leaching, alkaline leaching and acid-alkali combined treatment, the wet method can generate a new waste with less salt and a salt solution containing the salt to be recovered, although the salt can be reused as a molten aluminum refining agent, the recovery needs a large energy consumption to remove the water and obtain the salt with no commercial value. The pyrogenic process harmless treatment mainly comprises the steps of carrying out high-temperature roasting denitrification and synchronous fluorine fixation on secondary aluminum ash and a calcium source, wherein salt volatilization is not concerned in research, and adverse effects such as pipeline blockage, equipment corrosion and the like can be caused by salt volatilization and recrystallization.
Aiming at the secondary resources, if the secondary resources are directly used for cement production, the economic value is extremely low; aiming at the characteristic of high alumina content of the regenerated aluminum ash, some enterprises try to process the regenerated aluminum ash into calcium aluminate for preparing the steel-making desulfurizer. However, the regenerated aluminum ash has large difference of the types and contents of valuable components and complex occurrence relationship, which affects the quality stability of the prepared calcium aluminate product, especially contains more harmful elements such as K, Na, Cl, F, N and the like, and can volatilize in a large amount and cause equipment corrosion in the high-temperature preparation process; in addition, residual harmful elements in the product are dissolved into molten steel in the desulfurization process, and the performance of steel is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for obtaining a calcium aluminate product by taking industrial dangerous solid waste secondary aluminum ash as a raw material and carrying out high-temperature roasting through an additional calcium source, the method realizes the dry pressing of the secondary aluminum ash which is difficult to be pelletized by using a special binder to form pellets with certain mechanical strength, so that the pellets can be roasted by adopting a rotary kiln to meet the requirements of industrial production, the volatilization of salt-containing components such as Na, K and Cl of the pellets is realized in the high-temperature roasting process, metal aluminum and aluminum nitride can be oxidized into alumina, and the metal aluminum and the aluminum nitride can react with CaO to generate calcium aluminate simultaneously in the oxidation process; the product can be used as a raw material of calcium aluminate cement, can also be used for secondary recovery of alumina in calcium aluminate, or can be used as a calcium aluminate desulfurizer in the steel smelting process.
In order to realize the technical purpose, the invention provides a method for preparing a calcium aluminate product by using secondary aluminum ash, which comprises the steps of mixing the secondary aluminum ash with a calcium source and a binder, pressing the mixture into pellets by a dry method, and oxidizing and roasting the pellets to obtain the calcium aluminate product; the binder comprises used oil and asphalt.
The technical scheme of the invention uses secondary aluminum ash as a raw material, the secondary aluminum ash is fine-grained aluminum ash generated after metal aluminum is recovered from aluminum ash slag through ball milling and screening, the main component of the secondary aluminum ash is aluminum oxide, and the secondary aluminum ash also contains a small amount of metal aluminum, aluminum nitride, magnesium aluminate spinel, inorganic salt and other impurities. Because the secondary aluminum ash contains aluminum nitride, harmful gas is easy to generate if wet granulation is adoptedThe technical scheme of the invention adopts the special binder consisting of waste engine oil and asphalt to ensure that the secondary aluminum ash is easy to form ball material with higher mechanical strength by dry pressing, thereby realizing roasting through a rotary kiln, and simultaneously, the waste engine oil and the asphalt in the binder are all high hydrocarbon and can be used as fuel in the high-temperature roasting process, thereby reducing the roasting temperature and shortening the roasting time. Meanwhile, the secondary aluminum ash is externally provided with calcium sources, the calcium sources are provided as calcium sources of calcium aluminate on one hand, and the calcium sources such as desulfurized gypsum, limestone, slaked lime and the like can be used as auxiliary agents to promote smooth solid-phase sintering on the other hand. In addition, the small amount of magnesium contained in the secondary aluminum ash can also lower the melting point of the system, and the main mechanism is as follows: from CaO-MgO-Al2O3The ternary phase diagram shows that magnesium oxide and calcium aluminate generate calcium magnesium aluminate under a certain proportion, and the calcium magnesium aluminate is a low-melting-point substance, can reduce the melting point of the calcium aluminate and is beneficial to the application of a calcium aluminate product in a steel-making desulphurization process.
Preferably, the secondary aluminum ash has a particle size of-200 meshes, the content of the main component of aluminum oxide is not less than 75% by weight, and the other components also comprise metallic aluminum, aluminum nitride and magnesium aluminate spinel. The secondary aluminum ash is undersize products obtained by grinding and screening aluminum ash slag to recover metal aluminum, the mass percentage content of the metal aluminum is generally in the range of 0.5-3%, and since refining agents (mainly inorganic salt substances such as sodium salt, potassium salt, fluorine salt and the like) are added in the melting process of the metal aluminum, inorganic salt is doped in the secondary aluminum ash, the melting point of a system can be reduced by the inorganic salt substances at high temperature, the inorganic salt substances can be volatilized, so that the obtained calcium aluminate product hardly contains the inorganic salt, and the inorganic salt can be recovered by recrystallization; aluminum nitride is also present in the secondary aluminum ash, which is generated by the reaction of metallic aluminum with nitrogen in air in a high-temperature molten state, and the reaction equation is as follows: 2Al(s) + N2(g) 2AlN(s), ammonia gas is generated by aluminum nitride and water, so that the wet treatment of aluminum ash requires absorption of ammonia gas, while the pyrogenic treatment of aluminum nitride requires absorption of ammonia gasOnly alumina and nitrogen are generated, and the method has no pollution to the environment. The magnesium aluminate spinel can reduce the melting point of a system, and the magnesium oxide and the calcium aluminate generate calcium magnesium aluminate, so that the melting point of the calcium aluminate can be reduced, and the magnesium aluminate spinel is beneficial to the use of the calcium aluminate in a steel-making desulfurization process.
As a preferable scheme, the binder consists of 75-85% of waste engine oil and 15-25% of asphalt by mass percentage. The waste engine oil is used as organic hazardous waste, the most common treatment method in the prior art is incineration treatment, but the invention utilizes the high adhesive property and the combustibility of the waste engine oil as the binder of secondary aluminum ash, effectively realizes the resource utilization of the waste engine oil, can provide heat energy in the roasting stage of the aluminum ash ball rotary kiln, and can ensure that the aluminum ash balls are roasted more uniformly, and the adopted asphalt can ensure the mechanical strength of the aluminum ash balls and cannot generate toxic and harmful gas in the roasting stage; the high proportion of engine oil and the low proportion of asphalt are used as the binder, so that the problem of piling up a part of dangerous waste can be solved, and the mechanical strength of the aluminum ash balls can be enhanced. The waste engine oil plays a role similar to 'water' in the adhesive, can well dissolve and disperse asphalt, and therefore needs a high content, in the solid-phase consolidation process of the aluminum ash, the high viscosity of the asphalt is mainly acted by the high viscosity of the asphalt, when the asphalt is mixed with the waste engine oil, when the asphalt content is too high, the viscosity of the adhesive is too high, when the aluminum ash and the aluminum ash are mixed and stirred uniformly in a mixing barrel, the aluminum ash and the adhesive are locally agglomerated to cause uneven stirring, and finally, the strength of the extruded aluminum ash ball is uneven (the strength part is higher or lower), so that the proportion of the asphalt cannot be too high; if the proportion of the asphalt is too low, the bonding effect of the binder is poor, so that the finally extruded aluminum ash balls have low strength and can not meet the strength requirements of subsequent transportation and roasting.
Preferably, the addition amount of the binder is 0.5-1.5% of the total mass of the secondary aluminum ash and the calcium source.
As a preferred embodiment, the calcium source is at least one of limestone, desulfurized gypsum and slaked lime.
As a preferable scheme, the proportioning relationship between the secondary aluminum ash and the calcium source satisfies: the ratio of the total molar amount of aluminum and silicon elements in the secondary aluminum ash and the calcium source to the total molar amount of calcium and magnesium elements is 0.54-0.63: 1. The secondary aluminum ash also contains a small amount of oxides of silicon, magnesium and calcium, and CaO is preferentially mixed with SiO in the high-temperature roasting process2Calcium silicate is generated through reaction, and in a quaternary system of oxides of calcium, magnesium, aluminum and silicon, the melting point of the system can be reduced by the doping amount of 1-10% of silicon dioxide. Mg in the secondary aluminum ash mainly exists in the form of magnesia-alumina spinel, and in the high-temperature roasting process, along with the increase of CaO content and the increase of roasting temperature, the magnesia-alumina spinel can react with CaO to generate periclase and calcium aluminate, so that silicon magnesium has a larger influence on a calcium-aluminum system.
As a preferred scheme, the roasting conditions are as follows: roasting for 30-120 min at 900-1200 ℃ in air atmosphere. After the secondary aluminum ash and the calcium source are pressed into balls under the action of the binder, the contact area between the materials is increased, so that the solid-phase reaction is more sufficient, the obtained roasted product is a mixture mainly comprising calcium aluminate and secondarily comprising calcium magnesium aluminate and magnesium aluminum melilite, aluminum nitride is oxidized into alumina while the calcium aluminate is produced, volatile substances such as salts and the like are volatilized and collected, the content of the obtained calcium aluminate is higher than 70%, and the high-efficiency pre-melting type steel-making desulfurizer is excellent.
The oxidizing roasting of the invention is realized by a rotary kiln.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1) the invention takes the secondary aluminum ash of industrial hazardous waste as the raw material, realizes value-added processing while performing harmless comprehensive treatment, prepares the calcium aluminate series products which can be used as the desulfurizing agent for steelmaking and obtains higher economic value;
2) the invention can make the fine-grained aluminum ash into balls by a dry method by using the special binder consisting of the waste engine oil and the asphalt, and the obtained aluminum ash balls with higher mechanical strength lay a foundation for subsequent transportation and roasting;
3) the invention realizes the preparation of calcium aluminate at relatively low temperature and reduces energy consumption by regulating and controlling the raw material components and controlling the high-temperature roasting condition.
Drawings
FIG. 1 shows CaO-MgO-Al2O3Ternary phase diagram of (c).
Detailed Description
The following examples are intended to further illustrate the present disclosure, but not to limit the scope of the claims.
Comparative example 1
Taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, and the granularity is-200 meshes) of a certain regenerated aluminum factory as a raw material, and mixing the aluminum ash with a calcium-containing additive, wherein the calcium-containing additive comprises limestone (the theoretical content of calcium oxide is 52.86 percent), slaked lime (the theoretical content of calcium oxide is 70.42 percent) and 10 percent of desulfurized gypsum (the theoretical content of calcium oxide is 37.68 percent), and the mixing amount is controlled in a mixed material (Al + Si) (Ca + Mg) is 0.54: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 1200 ℃, the roasting time is 90min, and detecting the roasted products. The detection results show that the theoretical content of calcium aluminate in the product is 38.7%, the conversion rate of aluminum nitride is 84.3%, the salt volatilization rate is 65.2%, the breakage rate of aluminum ash balls is 84.7%, the melting point of the product is high, the desulfurization efficiency is low, and the breakage rate is high, so that the industrial production cannot be realized.
Comparative example 2
Taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, and the granularity is-200 meshes) of a certain regenerated aluminum plant as a raw material, and mixing the aluminum ash, a binder and a calcium-containing additive, wherein the addition amount of the binder is 1 percent (comprising 75 percent of waste engine oil and 25 percent of asphalt); the calcium-containing additive comprises limestone (calcium oxide theoretical content of 52.86%), slaked lime (calcium oxide theoretical content of 70.42%) and 10% of desulfurized gypsum (calcium oxide theoretical content of 37.68%), and the dosage is controlled in the mixing material (Al + Si): 0.54: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 800 ℃, the roasting time is 90min, and detecting the roasted products. The detection results show that the theoretical content of calcium aluminate in the product is 44.7%, the conversion rate of aluminum nitride is 85.8%, the volatilization rate of salt is 68.4%, and the breakage rate of aluminum ash balls is 5.2%, so that the product can meet the requirements of industrial production, but the product has high melting point and low desulfurization efficiency, and cannot be used as a steel-making desulfurizer.
Comparative example 3
Taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, the granularity is-200 meshes) of a certain regenerated aluminum plant as a raw material, and mixing the aluminum ash, a binder and a calcium-containing additive, wherein the addition amount of the binder is 0.3 percent (comprising 75 percent of waste engine oil and 25 percent of asphalt); the calcium-containing additive is limestone (calcium oxide theoretical content is 52.86%), and the dosage is controlled in the mixed material (Al + Si): (Ca + Mg) ═ 0.54: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 1200 ℃, the roasting time is 90min, and detecting the roasted products. The detection results show that the product contains 52.1 percent of calcium aluminate theoretical content, 87.9 percent of aluminum nitride conversion rate, 72.3 percent of salt volatilization rate and 4.7 percent of aluminum ash ball breakage rate, can meet the requirements of industrial production, but has high product melting point and low desulfurization efficiency, and can not be used as a steel-making desulfurizer.
Example 1
The method comprises the following steps of taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, and the granularity is-200 meshes) of a certain regenerated aluminum factory as a raw material, mixing the aluminum ash with a binder and a calcium-containing additive, wherein the binder is added in an amount of 1 percent, the binder comprises 75 percent of waste engine oil and 25 percent of asphalt, the calcium-containing additive comprises limestone (the theoretical content of calcium oxide is 52.86 percent), slaked lime (the theoretical content of calcium oxide is 70.42 percent) and 10 percent of desulfurized gypsum (the theoretical content of calcium oxide is 37.68 percent), and the mixing amount is controlled in the mixing material (Al + Si): 0.54: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 1200 ℃, the roasting time is 90min, and detecting the roasted products. The detection result shows that the product contains 91.4 percent of calcium aluminate theoretical content, 100.0 percent of aluminum nitride conversion rate, 99.7 percent of salt volatilization rate and 2.7 percent of aluminum ash ball breakage rate, meets the requirement of industrial production, and can be used as a steel-making desulfurizer.
Example 2
The method comprises the following steps of taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, and the granularity is-200 meshes) of a certain regenerated aluminum factory as a raw material, and mixing the aluminum ash with a binder and a calcium-containing additive, wherein the addition amount of the binder is 1 percent (comprising 80 percent of waste engine oil and 20 percent of asphalt), the calcium-containing additive comprises limestone (the theoretical content of calcium oxide is 52.86 percent), slaked lime (the theoretical content of calcium oxide is 70.42 percent) and 10 percent of desulfurized gypsum (the theoretical content of calcium oxide is 37.68 percent), and the mixing amount is controlled in the mixing material (Al + Si): 0.59: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 1000 ℃, the roasting time is 120min, and detecting the roasted products. The detection results show that the product contains 95.2 percent of calcium aluminate theoretical content, 100.0 percent of aluminum nitride conversion rate, 99.9 percent of salt volatilization rate and 2.2 percent of aluminum ash ball breakage rate, meets the industrial production requirements, and can be used as a steel-making desulfurizer.
Example 3
Taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, and the granularity is-200 meshes) of a certain regenerated aluminum plant as a raw material, and mixing the aluminum ash, a binder and a calcium-containing additive, wherein the addition amount of the binder is 1 percent (comprising 80 percent of waste engine oil and 20 percent of asphalt), the calcium-containing additive is limestone, and the mixing amount is controlled in a mixed material (Al + Si) (the content of (Ca + Mg) is 0.59: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 1200 ℃, the roasting time is 120min, and detecting the roasted products. The detection result shows that the product contains 93.3 percent of calcium aluminate theoretical content, 100.0 percent of aluminum nitride conversion rate, 99.7 percent of salt volatilization rate and 2.4 percent of aluminum ash ball breakage rate, meets the requirement of industrial production, and can be used as a steel-making desulfurizer.
Example 4
The method comprises the following steps of taking secondary aluminum ash (the content of aluminum oxide is 76.5 percent, the content of magnesium oxide is 4.3 percent, the content of silicon dioxide is 3.4 percent, and the granularity is-200 meshes) of a certain regenerated aluminum plant as a raw material, and mixing the aluminum ash with a binder and a calcium-containing additive, wherein the addition amount of the binder is 1.2 percent (comprising 80 percent of waste engine oil and 20 percent of asphalt), the calcium-containing additive comprises limestone (the theoretical content of calcium oxide is 52.86 percent), slaked lime (the theoretical content of calcium oxide is 70.42 percent) and 10 percent of desulfurized gypsum (the theoretical content of calcium oxide is 37.68 percent), and the mixing amount is controlled in the mixing material (Al + Si): 0.59: 1; uniformly mixing the materials, placing the materials in a high-pressure dry powder ball press machine, pressing the materials into balls under the pressure of 50t, finally placing the pressed aluminum ash balls in an air atmosphere for roasting, wherein the roasting temperature is 1200 ℃, the roasting time is 30min, and detecting the roasted products. The detection result shows that the product contains 87.4 percent of calcium aluminate theoretical content, 100.0 percent of aluminum nitride conversion rate, 90.3 percent of salt volatilization rate and 1.7 percent of aluminum ash ball breakage rate, meets the requirement of industrial production, and can be used as a steel-making desulfurizer.
Claims (7)
1. A method for preparing calcium aluminate products by using secondary aluminum ash is characterized in that: mixing the secondary aluminum ash with a calcium source and a binder, pressing the mixture into pellets by a dry method, and oxidizing and roasting the pellets to obtain the aluminum-containing composite material; the binder comprises used oil and asphalt.
2. The method for preparing calcium aluminate product by using secondary aluminum ash as claimed in claim 1, wherein: the secondary aluminum ash has a particle size of-200 meshes, the mass percentage content of the main component of aluminum oxide is not less than 75%, and other components comprise metallic aluminum, aluminum nitride and magnesium aluminate spinel.
3. The method for preparing calcium aluminate product by using secondary aluminum ash as claimed in claim 1, wherein: the adhesive consists of 75-85 wt% of waste engine oil and 15-25 wt% of asphalt.
4. The method for preparing calcium aluminate product by using secondary aluminum ash as claimed in claim 1, wherein: the addition amount of the binder is 0.5-1.5% of the total mass of the secondary aluminum ash and the calcium source.
5. The method for preparing calcium aluminate product using secondary aluminum ash as claimed in claim 1 or 4, wherein: the calcium source is at least one of limestone, desulfurized gypsum and slaked lime.
6. The method for preparing calcium aluminate product by using secondary aluminum ash as claimed in claim 1, wherein: the proportion relationship between the secondary aluminum ash and the calcium source meets the following requirements: the ratio of the total molar amount of aluminum and silicon elements in the secondary aluminum ash and the calcium source to the total molar amount of calcium and magnesium elements is 0.54-0.63: 1.
7. The method for preparing calcium aluminate product by using secondary aluminum ash as claimed in claim 1, wherein: the oxidizing roasting conditions are as follows: roasting for 30-120 min at 900-1200 ℃ in air atmosphere.
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| CN114853460A (en) * | 2022-05-16 | 2022-08-05 | 中南大学 | Method for synchronously preparing calcium aluminate by treating secondary aluminum ash through sintering machine |
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