CN113943116A - Process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration - Google Patents
Process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration Download PDFInfo
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- CN113943116A CN113943116A CN202111262313.0A CN202111262313A CN113943116A CN 113943116 A CN113943116 A CN 113943116A CN 202111262313 A CN202111262313 A CN 202111262313A CN 113943116 A CN113943116 A CN 113943116A
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- fly ash
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- alumina cement
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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
- C04B7/32—Aluminous cements
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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
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
- C01F11/28—Chlorides by chlorination of alkaline-earth metal compounds
-
- 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
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a process for producing high-alumina cement by using fly ash generated after burning aluminum ash and garbage, which comprises the steps of mixing and homogenizing the aluminum ash and the fly ash generated after burning the garbage according to the weight ratio of (6-7) to (3-4), heating the materials to the temperature of 1400 ℃ and 1700 ℃ through a high-temperature smelting furnace, carrying out heating and heat preservation for 2-3h, and crushing and grinding the materials after cooling to obtain the high-alumina cement. According to the scheme, the aluminum ash and the fly ash after waste incineration are mixed, homogenized and then melted at high temperature to prepare the high-alumina cement with the main component of calcium aluminate-calcium aluminosilicate, and the high-alumina cement can reach the CA-60 cement level. The leaching rate of a large amount of heavy metal salts in the fly ash after being melted is low, dioxin can be degraded and harmlessly at about 1400 ℃, and the toxicity leaching after treatment meets the environmental protection requirement and the national standard. After the chloride in the aluminum ash is volatilized at the high temperature of 1400 ℃ and 1700 ℃, the calcium chloride is collected by a rapid cooling dust removal cloth bag through a flue gas pipeline to form a harmless calcium chloride byproduct.
Description
The technical field is as follows:
the invention relates to a production process of high-alumina cement, in particular to a process for producing the high-alumina cement by using aluminum ash and fly ash generated after waste incineration.
Background art:
the aluminum ash is scum floating on the aluminum liquid of the electrolytic bath generated in the aluminum electrolysis process. The aluminum ash is mainly divided into primary aluminum ash (white ash) and secondary aluminum ash (black ash). The primary aluminum ash is aluminum slag generated in the process of producing aluminum from original aluminum, and the primary aluminum ash mainly comprises metallic aluminum and aluminum oxide, wherein the content of the metallic aluminum can reach 30-70%. The secondary aluminum ash is the residue of primary aluminum ash or other waste aluminum after extracting metal aluminum by a physical method or a chemical method, has low content of metal aluminum and relatively complex components, and mainly comprises a small amount of aluminum (the content is less than 10 wt%), a salt flux (more than 10%), an oxide and aluminum nitride (the content is 15-30 wt%). According to the national records of hazardous waste (2016) regulations: four waste residues, namely waste residue generated by maintenance and waste of an electrolytic cell in the aluminum electrolysis process, primary smelting slag generated in the aluminum pyrometallurgical process, salt slag and scum generated in the aluminum electrolysis process and inflammable skimming generated in the aluminum pyrometallurgical process, belong to HW48 non-ferrous metal smelting waste. Therefore, the recovery and utilization of the aluminum ash have important significance on environmental protection, efficient utilization of resources and economic sustainable development.
The fly ash generated after the incineration of the garbage is residue collected in a flue gas purification system (APC) and a heat recovery system (such as an economizer, a boiler and the like), accounts for about 20 percent of the total amount of the ash residue generated after the incineration of the garbage, is a substance collected by a flue gas dust collector after the incineration of the household garbage, is fine dust particles with very low water content, is light grey powder, and generally has the water content of 10 to 23 percent and the heat burning reduction rate of 34 to 51 percent. The particle size of the fly ash is uneven, and is an irregular object formed by gathering particulate matters, reaction products, unreacted products and condensation products, but generally, the particle size is smaller and basically less than 100 mu m, the surface is rough, the fly ash is polygonal, the porosity is higher, and the specific surface area is larger, so that pollutants such as dioxin, heavy metals and the like can be easily gathered in the smoke before the generated fly ash is captured in the waste incineration process (namely, the content is high). Meanwhile, the chlorine content of the household garbage fly ash is generally over ten percent, which corresponds to larger salt content, namely, more pollutants such as heavy metals and the like can be brought into the environment by the soluble part of the fly ash in the environment.
Because the fly ash generated after the garbage incineration has the characteristics, the fly ash can not be directly buried and treated but needs to be stabilized; at present, two main treatment modes for stabilizing fly ash generated after garbage incineration are provided, one is to mix the fly ash with related substances such as cement, chelating agent, water and the like to stabilize the fly ash (i.e. harmful substances cannot be revealed), and then the fly ash is buried, and the treatment cost is low, but the land is saved; the second is to modify the fly ash to produce building materials, which saves land but has high production cost, and the produced building materials have low standards and can only be used as low-standard materials for road construction and the like.
The invention content is as follows:
the invention aims to provide a process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration.
The invention is implemented by the following technical scheme: the process for producing the high-alumina cement by using the fly ash generated after the incineration of the aluminum ash and the garbage comprises the steps of mixing and homogenizing the aluminum ash and the fly ash generated after the incineration of the garbage according to the weight ratio of (6-7) to (3-4), heating the materials to the temperature of 1400 ℃ through a high-temperature smelting furnace, preserving the heat for 2-3h, cooling, crushing and grinding the materials to obtain the high-alumina cement.
Furthermore, the flue gas generated in the high-temperature melting process is cooled and dedusted to obtain a byproduct calcium chloride.
Further, the aluminum ash comprises the following components in parts by weight: 31.55 parts of aluminum oxide, 5.56 parts of silicon dioxide, 2-3 parts of sodium oxide, 2 parts of calcium oxide and 1-2 parts of chloride.
Further, the fly ash comprises the following components in parts by weight: 7.42 parts of alumina, 24.5 parts of silicon dioxide, 4.01 parts of ferric oxide and 33.37 parts of calcium oxide.
The invention has the advantages that: according to the scheme, the aluminum ash and the fly ash after waste incineration are mixed, homogenized and then melted at high temperature to prepare the high-alumina cement with the main component of calcium aluminate-calcium aluminosilicate, and the high-alumina cement can reach the CA-60 cement level. The leaching rate of a large amount of heavy metal salts in the fly ash after being melted is low, dioxin can be degraded and harmlessly at about 1400 ℃, and the toxicity leaching after treatment meets the environmental protection requirement and the national standard. After the chloride in the aluminum ash is volatilized at the high temperature of 1400 ℃ and 1700 ℃, the calcium chloride is collected by a rapid cooling dust removal cloth bag through a flue gas pipeline to form a harmless calcium chloride byproduct.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The aluminum ash and fly ash used in the following examples had the following composition, the aluminum ash comprising, in parts by weight: 31.55 parts of alumina, 5.56 parts of silicon dioxide, 2-3 parts of sodium oxide, 2 parts of calcium oxide and 1.5 parts of chloride. The fly ash comprises the following components in parts by weight: 7.42 parts of alumina, 24.5 parts of silicon dioxide, 4.01 parts of ferric oxide and 33.37 parts of calcium oxide.
Example 1
The process for producing the high-alumina cement by using the fly ash generated after the incineration of the aluminum ash and the garbage comprises the steps of mixing and homogenizing the aluminum ash and the fly ash generated after the incineration of the garbage according to the weight ratio of 6:4, heating the materials to 1600 ℃ through a high-temperature smelting furnace, cooling, crushing and grinding the materials into powder to obtain the high-alumina cement. And cooling and dedusting smoke generated in the high-temperature melting process to obtain a calcium chloride byproduct.
Example 2
The process for producing the high-alumina cement by using the fly ash generated after the incineration of the aluminum ash and the garbage comprises the steps of mixing and homogenizing the aluminum ash and the fly ash generated after the incineration of the garbage according to the weight ratio of 7:3, heating the materials to 1600 ℃ through a high-temperature smelting furnace, cooling, crushing and grinding the materials into powder to obtain the high-alumina cement. And cooling and dedusting smoke generated in the high-temperature melting process to obtain a calcium chloride byproduct.
The high-alumina cement prepared by the production of the embodiment 1 and the embodiment 2 is subjected to a cement mortar strength test according to a cement mortar strength test method (GB/T17671-1999); the detection of the content of dioxin in cement is carried out according to research on the law of hydrothermal degradation of dioxin in municipal waste incineration fly ash. The results are shown in the following table.
| Test item | Example 1 | Example 2 |
| Compressive strength of single shaft (MPa) | 2.74 | 2.99 |
| Dioxin content (ng I-TEQ/N m)3) | 0 | 0 |
As can be seen from the table, the high-alumina cement produced by the scheme has high uniaxial compressive strength, does not contain dioxin, and does not belong to hazardous waste, so the method can realize the effect of changing waste into valuable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The process for producing the high-alumina cement by using the fly ash generated after the incineration of the aluminum ash and the garbage is characterized in that the aluminum ash and the fly ash generated after the incineration of the garbage are mixed and homogenized according to the weight ratio of (6-7) to (3-4), the materials are heated to 1400 ℃ in a high-temperature melting furnace, the temperature is kept for 2-3h, and the materials are crushed and ground into powder after being cooled to obtain the high-alumina cement.
2. The process for producing high alumina cement using aluminum ash and fly ash generated after incineration of garbage according to claim 1, wherein the flue gas generated in the high temperature melting process is cooled and dedusted to obtain calcium chloride as a byproduct.
3. The process for producing high alumina cement according to claim 1, wherein the aluminum ash comprises the following components in parts by weight: 31.55 parts of aluminum oxide, 5.56 parts of silicon dioxide, 2-3 parts of sodium oxide, 2 parts of calcium oxide and 1-2 parts of chloride.
4. The process for producing high alumina cement according to claim 1, wherein the fly ash comprises the following components in parts by weight: 7.42 parts of alumina, 24.5 parts of silicon dioxide, 4.01 parts of ferric oxide and 33.37 parts of calcium oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111262313.0A CN113943116A (en) | 2021-10-28 | 2021-10-28 | Process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111262313.0A CN113943116A (en) | 2021-10-28 | 2021-10-28 | Process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration |
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| CN113943116A true CN113943116A (en) | 2022-01-18 |
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| CN202111262313.0A Pending CN113943116A (en) | 2021-10-28 | 2021-10-28 | Process for producing high-alumina cement by using aluminum ash and fly ash generated after waste incineration |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114425556A (en) * | 2022-02-07 | 2022-05-03 | 浙江美臣新材料科技有限公司 | Aluminum ash recycling treatment method |
| CN114470607A (en) * | 2022-02-07 | 2022-05-13 | 浙江美臣新材料科技有限公司 | Harmless recovery treatment method for aluminum ash |
| CN114538489A (en) * | 2022-03-18 | 2022-05-27 | 四川轻化工大学 | Method and system for preparing efficient powdery accelerator from aluminum ash |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863162A (en) * | 2011-07-04 | 2013-01-09 | 王世林 | Processing technology for high purity calcium aluminate cement |
| CN111333354A (en) * | 2020-03-09 | 2020-06-26 | 常熟理工学院 | Method for preparing non-sintered cement by using municipal domestic waste and product |
| CN112645615A (en) * | 2020-12-28 | 2021-04-13 | 山东大学 | System and method for preparing sulphoaluminate cement from whole solid waste of garbage fly ash heat treatment |
| CN113173718A (en) * | 2021-04-20 | 2021-07-27 | 山东大学 | Waste incineration fly ash curing agent, preparation method and treatment method |
-
2021
- 2021-10-28 CN CN202111262313.0A patent/CN113943116A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102863162A (en) * | 2011-07-04 | 2013-01-09 | 王世林 | Processing technology for high purity calcium aluminate cement |
| CN111333354A (en) * | 2020-03-09 | 2020-06-26 | 常熟理工学院 | Method for preparing non-sintered cement by using municipal domestic waste and product |
| CN112645615A (en) * | 2020-12-28 | 2021-04-13 | 山东大学 | System and method for preparing sulphoaluminate cement from whole solid waste of garbage fly ash heat treatment |
| CN113173718A (en) * | 2021-04-20 | 2021-07-27 | 山东大学 | Waste incineration fly ash curing agent, preparation method and treatment method |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114425556A (en) * | 2022-02-07 | 2022-05-03 | 浙江美臣新材料科技有限公司 | Aluminum ash recycling treatment method |
| CN114470607A (en) * | 2022-02-07 | 2022-05-13 | 浙江美臣新材料科技有限公司 | Harmless recovery treatment method for aluminum ash |
| CN114538489A (en) * | 2022-03-18 | 2022-05-27 | 四川轻化工大学 | Method and system for preparing efficient powdery accelerator from aluminum ash |
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Application publication date: 20220118 |