CN112456529A - Method for preparing alumina powder production raw material by microwave treatment of aluminum ash - Google Patents
Method for preparing alumina powder production raw material by microwave treatment of aluminum ash Download PDFInfo
- Publication number
- CN112456529A CN112456529A CN202011268551.8A CN202011268551A CN112456529A CN 112456529 A CN112456529 A CN 112456529A CN 202011268551 A CN202011268551 A CN 202011268551A CN 112456529 A CN112456529 A CN 112456529A
- Authority
- CN
- China
- Prior art keywords
- aluminum ash
- microwave
- microwave treatment
- powder
- aluminum
- 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.)
- Pending
Links
Classifications
-
- 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
- C01F7/46—Purification of aluminium oxide, aluminium hydroxide or aluminates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/12—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electromagnetic waves
- B01J19/122—Incoherent waves
- B01J19/126—Microwaves
-
- 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
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- 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
Abstract
The invention discloses a method for preparing alumina powder production raw materials by microwave treatment of aluminum ash, which comprises the steps of heating the aluminum ash by microwave energy radiation in a microwave treatment reaction cavity, and treating the aluminum ash at a specific temperature and for a specific radiation time to obtain the alumina powder with high aluminum oxide content, high whiteness and less impurities. Compared with other aluminum ash treatment methods, the method is more energy-saving and more environment-friendly. Is beneficial to resource utilization of industrial hazardous wastes and reduces the cost of raw materials required by the production of the alumina powder.
Description
Technical Field
The invention relates to the field of resource utilization of industrial hazardous solid wastes, and also relates to a method for preparing alumina powder production raw materials by treating aluminum ash with microwaves and equipment for treating the aluminum ash by using the method.
Background
The aluminum ash is waste residue in the aluminum smelting industry, mainly comprises surface insoluble substances and impurities generated in the processes of electrolytic aluminum and aluminum alloy casting and aluminum recovery and reproduction, namely slag, and is dangerous solid waste in industrial production. The aluminum ash mainly contains metallic aluminum, aluminum oxide, aluminum nitride, fluoride, chloride, carbide, silicon dioxide, calcium oxide, magnesium oxide and the like. If the treatment is carried out only by adopting improper methods such as a landfill method and the like, not only the valuable salts such as alumina and the like in the waste are wasted, but also the environmental pollution to soil and underground water is easily caused. According to the national hazardous waste records, the electrolytic bath maintenance and waste slag in the aluminum electrolysis process, primary smelting slag generated in the aluminum pyrometallurgy process, salt slag scum generated in the aluminum electrolysis process and inflammable skimming generated in the aluminum pyrometallurgy process belong to hazardous wastes, and the hazardous waste code is 321-023-026-48.
Microwave heating is different from the traditional heating mode, the microwave heating does not need a heat conduction process, the heating material can become a heating body, and even the material with poor heat conduction can reach the heating temperature in a very short time. Microwave can make the material uniformly permeate electromagnetic wave to generate heat energy, which is not limited by the shape of the object, so the heating is more uniform, and the phenomenon of external heat and internal heat can not occur. The microwave is contacted with the material, but does not pollute the material, and is a very clean energy carrier.
Alumina powder is a stable oxide of aluminum, known in the mining, ceramics and materials sciences as alumina, and is an advanced refractory material. Along with the rapid development of the industries of electrolytic aluminum, ceramics, medicines, electronics, machinery and the like in China, the demand of the market for the aluminum oxide still has a large growth space, and the alumina ore used as the raw material for producing the aluminum oxide is less and less. From the sustainable development point of view, it is very urgent to develop a treatment technology for harmlessly recycling aluminum ash with feasible process and no secondary pollution, and to improve the value of recycling the industrial solid waste aluminum ash.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of low alumina content and high impurity content in the prior art when hazardous waste aluminum ash is treated and the alumina powder raw material is produced by utilizing aluminum ash microwave treatment, the invention provides a method for preparing the alumina powder production raw material by utilizing the aluminum ash microwave treatment. The aluminum ash treated by the method has high aluminum oxide content, high whiteness and less impurities, can be used for producing alumina powder, realizes resource utilization of the aluminum ash which is dangerous solid waste, reduces adverse effects on the environment, and can obtain good economic benefit and environmental protection benefit.
Technical scheme
A method for preparing alumina powder production raw materials by microwave treatment of aluminum ash comprises the following steps:
firstly, carrying out primary selection and crushing on aluminum ash, crushing into 30-100-mesh aluminum ash powder which is completely sieved, and feeding the aluminum ash powder into a collecting hopper;
step two, filling all the sieved aluminum ash powder in the collecting hopper into a microwave treatment reaction cavity by using a screw conveyor;
step three, after the aluminum ash powder is loaded into a microwave treatment reaction cavity, the aluminum ash powder is fully stirred and mixed by one or more spiral shafts in an oxygen-free or oxygen-isolated atmosphere, and simultaneously the aluminum ash powder is heated by microwave radiation to be higher than or equal to 600 ℃ for 10-30 minutes;
and step four, introducing high-temperature air into the microwave treatment reaction cavity to participate in the reaction, heating the aluminum ash in the microwave treatment reaction cavity by microwave continuous radiation under an oxidizing atmosphere with the oxygen content of 10% -21%, keeping the temperature of the aluminum ash above 800 ℃, and continuously treating the aluminum ash for 1-2 hours to obtain the production raw material of the aluminum oxide powder.
And step five, conveying the finished powder to a powder warehouse for storage by using a water-cooling conveyor.
In the third step and the fourth step, a spiral stirring mechanism is arranged in the microwave treatment reaction cavity.
The heating equipment directly heats the aluminum ash powder by microwaves, and the heat source for direct heating is microwave energy generated by a microwave generator. The source of the direct heating is microwave energy. The heating equipment is microwave treatment equipment.
The process of the microwave heating aerobic treatment in the fourth step can be continuous or intermittent, wherein the continuous means that the feeding, the microwave treatment and the discharging can be simultaneously and continuously carried out, the feeding hole is used for continuously feeding, and the discharging hole is used for continuously discharging; intermittent means that feeding and discharging are intermittent, feeding is carried out once, discharging is carried out after the whole microwave treatment process is finished, one batch of treatment is finished, and then the next batch of material is fed for treatment.
The microwave treatment equipment used by the method is a horizontal microwave reaction cavity with an internal stirring structure, the microwave reaction cavity is provided with a feed inlet, a discharge outlet, an air inlet, an air outlet and a microwave energy feedback port which are communicated with the microwave reaction cavity, the feed inlet is positioned on the upper side of one end of the microwave reaction cavity, the discharge outlet is positioned on the lower side of the other end of the microwave reaction cavity, the air inlet is positioned on the lower side of the middle part of the microwave reaction cavity, the air outlet is positioned on the upper sides of the microwave reaction cavity and the discharge end, and the microwave energy feedback port is positioned on the two sides or the top.
Has the advantages that: the method provided by the invention has reasonable process design, adopts microwave energy radiation heating, reduces the fluorine and chlorine contents of the treated aluminum ash to below the national standard at specific temperature and radiation time, has high aluminum oxide content, high whiteness and less impurities, can produce alumina powder, realizes the resource utilization of the aluminum ash which is dangerous solid waste, reduces the adverse effect on the environment, and solves the problem of the gradual shortage of bauxite resources. Compared with other aluminum ash treatment methods, the method is more energy-saving and more environment-friendly. Is beneficial to resource utilization of industrial hazardous wastes and reduces the cost of raw materials required by the production of the alumina powder.
Materials with poor thermal conductivity can also reach the heating temperature in a very short time. Microwave can make the material uniformly permeate electromagnetic wave to generate heat energy, which is not limited by the shape of the object, so the heating is more uniform, and the phenomenon of external heat and internal heat can not occur. The microwave is contacted with the material, but does not pollute the material, and is a very clean energy carrier.
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to specific implementations, and all the portions of the present invention that are not described in detail in the technical features or the connection relationships of the present invention are the prior art.
Example 1
A method for preparing alumina powder production raw materials by microwave treatment of aluminum ash comprises the following steps
Firstly, carrying out primary selection and crushing on aluminum ash, crushing into 30-100-mesh aluminum ash powder which is completely sieved, and feeding the aluminum ash powder into a collecting hopper;
secondly, filling all the sieved aluminum ash powder in the collecting hopper into a microwave treatment reaction cavity by using a screw conveyor;
step three, after the aluminum ash powder is filled into a microwave treatment reaction cavity, fully stirring and mixing the aluminum ash powder by adopting a spiral shaft in an oxygen-free atmosphere, heating the aluminum ash powder to 600 ℃ by using microwave radiation, and keeping the temperature for 20 minutes;
and step four, introducing high-temperature air into the microwave treatment reaction cavity to participate in the reaction, continuously heating the aluminum ash in the microwave treatment reaction cavity by microwave radiation under an oxidizing atmosphere with the oxygen content of 16% to 20%, keeping the temperature of the aluminum ash at 800 ℃, and continuously treating the aluminum ash for 1 hour to obtain the production raw material of the aluminum oxide powder.
And step five, conveying the finished powder to a powder warehouse for storage by using a water-cooling conveyor.
The content of the aluminum oxide contained in the finished powder is detected to be 79.71%, and the whiteness is 68.4%.
The concentration of harmful components in the leachate is smaller than the standard limit value by detecting the finished product powder according to GB5085.3-2007 'identification of hazardous waste identification standard leaching toxicity identification'.
| Detecting items | Concentration of harmful components in the leachate (mg/L) |
| As | 0.000018 |
| Se | 0.143 |
| Cr | 0.0006 |
| Cd | 0.00013 |
| Ba | ND |
| Pb | ND |
| Fluoride compounds | 78.45 |
| Cyanide compounds | 0.018 |
In the third step and the fourth step, a spiral stirring mechanism is arranged in the microwave treatment reaction cavity.
The heating equipment adopts microwave to directly radiate the aluminum ash powder, the heat source for direct heating is microwave energy generated by a microwave generator, the heat source for direct heating is microwave energy, and the heating equipment is microwave treatment equipment.
The whole horizontal reaction chamber with the stirring structure inside is arranged in the microwave treatment equipment, the reaction chamber is provided with a feed inlet, a discharge outlet, an air inlet, an air outlet and a microwave energy feedback port which are communicated with the reaction chamber, the feed inlet is positioned on the upper side of one end of the reaction chamber, the discharge outlet is positioned on the lower side of the other end of the reaction chamber, the air inlet is positioned on the lower side of the middle part of the reaction chamber, the air outlet is positioned on the upper sides of the reaction chamber and the discharge end, and the microwave energy feedback port is positioned on the two. When the microwave treatment equipment is used, the air outlet is connected with the induced draft fan, and the pressure in the microwave treatment equipment can be adjusted by adjusting the working frequency of the induced draft fan. The reaction chamber is provided with a manhole structure to facilitate internal maintenance.
Comparative example 1
A method for preparing alumina powder production raw materials by microwave treatment of aluminum ash comprises the following steps
Firstly, carrying out primary selection and crushing on aluminum ash, crushing into 30-100-mesh aluminum ash powder which is completely sieved, and feeding the aluminum ash powder into a collecting hopper;
secondly, filling all the sieved aluminum ash powder in the collecting hopper into a microwave treatment reaction cavity by using a screw conveyor;
step three, after the aluminum ash powder is filled into a microwave treatment reaction cavity, fully stirring and mixing the aluminum ash powder by adopting a spiral shaft in an oxygen-free atmosphere, heating the aluminum ash powder to 550 ℃ by using microwave radiation, and lasting for 10 minutes;
and step four, introducing high-temperature air into the microwave treatment reaction cavity to participate in the reaction, and under the oxidizing atmosphere with the oxygen content of 10%, continuously radiating and heating by microwaves to increase the temperature of the aluminum ash in the microwave treatment reaction cavity, keeping the temperature at 700 ℃, and continuously treating for 1h to obtain the aluminum ash which is the production raw material of the alumina powder.
And step five, conveying the finished powder to a powder warehouse for storage by using a water-cooling conveyor.
The content of the aluminum oxide in the finished powder is 70.08 percent and the whiteness is 58.9 percent.
It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and all embodiments cannot be exhaustive, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; as long as the use requirements are met, the method is within the protection scope of the invention.
Claims (5)
1. A method for preparing alumina powder production raw materials by microwave treatment of aluminum ash is characterized by comprising the following steps:
firstly, carrying out primary selection and crushing on aluminum ash, crushing into 30-100-mesh aluminum ash powder which is completely sieved, and feeding the aluminum ash powder into a collecting hopper;
secondly, filling all the sieved aluminum ash powder in the collecting hopper into a microwave treatment reaction cavity by using a screw conveyor;
step three, after the aluminum ash powder is filled into a microwave treatment reaction cavity, fully stirring and mixing the aluminum ash powder by adopting one or more spiral shafts in an oxygen-free or oxygen-isolated atmosphere, and simultaneously heating the aluminum ash powder by using microwave radiation to the temperature of more than or equal to 600 ℃ for 10-30 minutes;
introducing high-temperature air into the microwave treatment reaction cavity to participate in the reaction, heating the aluminum ash in the microwave treatment reaction cavity by microwave continuous radiation under an oxidizing atmosphere with the oxygen content of 10-21%, keeping the temperature of the aluminum ash at more than 800 ℃, and performing continuous microwave treatment for 1-2 hours to obtain a production raw material of the aluminum oxide powder;
and step five, then conveying the powder to a powder storage by using a water-cooling conveyor for storage.
2. The method for preparing alumina powder production raw material by microwave treatment of aluminum ash according to claim 1, wherein the method comprises the following steps: in the third step and the fourth step, a spiral stirring mechanism is arranged in the microwave treatment reaction cavity.
3. The method for preparing alumina powder production raw material by microwave treatment of aluminum ash according to claim 1, wherein the method comprises the following steps: the heating equipment directly heats the aluminum ash powder by microwaves, and the heat source for direct heating is microwave energy generated by a microwave generator.
4. The method for preparing alumina powder production raw material by microwave treatment of aluminum ash according to claim 1, wherein the method comprises the following steps: the process of the microwave heating aerobic treatment in the fourth step can be continuous or intermittent, wherein the continuous means that the feeding, the microwave treatment and the discharging can be simultaneously and continuously carried out, the feeding hole is used for continuously feeding, and the discharging hole is used for continuously discharging; intermittent means that feeding and discharging are intermittent, feeding is carried out once, discharging is carried out after the whole microwave treatment process is finished, one batch of treatment is finished, and then the next batch of material is fed for treatment.
5. A microwave processing apparatus for use in the method of claim 1, wherein: the whole microwave treatment equipment is a horizontal reaction cavity with a stirring structure arranged inside; the reaction chamber is provided with a feed inlet, a discharge outlet, an air inlet, an air outlet and a microwave energy feedback port which are communicated with the interior of the reaction chamber, the feed inlet is positioned at the upper side of one end of the reaction chamber, the discharge outlet is positioned at the lower side of the other end of the reaction chamber, the air inlet is positioned at the lower side of the middle part of the reaction chamber, the air outlet is positioned at the upper sides of the reaction chamber and the discharge end, and the microwave energy feedback port is positioned at the.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268551.8A CN112456529A (en) | 2020-11-13 | 2020-11-13 | Method for preparing alumina powder production raw material by microwave treatment of aluminum ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011268551.8A CN112456529A (en) | 2020-11-13 | 2020-11-13 | Method for preparing alumina powder production raw material by microwave treatment of aluminum ash |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112456529A true CN112456529A (en) | 2021-03-09 |
Family
ID=74825764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011268551.8A Pending CN112456529A (en) | 2020-11-13 | 2020-11-13 | Method for preparing alumina powder production raw material by microwave treatment of aluminum ash |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112456529A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113200558A (en) * | 2021-04-29 | 2021-08-03 | 河南长兴实业有限公司 | Production process for producing microcrystalline alpha-alumina by microwave calcination |
| CN113231050A (en) * | 2021-04-20 | 2021-08-10 | 南京三乐微波技术发展有限公司 | Method and device for regenerating waste activated carbon through microwave activation |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271327A (en) * | 2014-09-26 | 2016-01-27 | 昆明冶金研究院 | Method for harmless disposal and recycling of aluminum ash |
| CN111573701A (en) * | 2020-05-20 | 2020-08-25 | 沈阳益富冶炼技术装备有限公司 | Method for preparing brown corundum production raw material by using aluminum ash |
-
2020
- 2020-11-13 CN CN202011268551.8A patent/CN112456529A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271327A (en) * | 2014-09-26 | 2016-01-27 | 昆明冶金研究院 | Method for harmless disposal and recycling of aluminum ash |
| CN111573701A (en) * | 2020-05-20 | 2020-08-25 | 沈阳益富冶炼技术装备有限公司 | Method for preparing brown corundum production raw material by using aluminum ash |
Non-Patent Citations (1)
| Title |
|---|
| 姜发堂等: "方便食品原料学与工艺学", vol. 1, 中国轻工业出版社, pages: 233 - 235 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113231050A (en) * | 2021-04-20 | 2021-08-10 | 南京三乐微波技术发展有限公司 | Method and device for regenerating waste activated carbon through microwave activation |
| CN113200558A (en) * | 2021-04-29 | 2021-08-03 | 河南长兴实业有限公司 | Production process for producing microcrystalline alpha-alumina by microwave calcination |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106077040B (en) | A kind of method of ultrasonic wave auxiliary alkali leaching process aluminum electrolytic waste and old cathode carbon block | |
| JP7204156B2 (en) | Pre-dechlorination and sintering process for highly chlorinated metallurgical waste and incineration fly ash | |
| CN112456529A (en) | Method for preparing alumina powder production raw material by microwave treatment of aluminum ash | |
| CN110144457B (en) | Method for preparing aluminum-silicon-iron alloy by carbon thermal reduction of aluminum ash pretreatment | |
| CN110129506B (en) | Method for preparing ferro-silicon-aluminum alloy by carbon thermal reduction of waste refractory material pretreatment | |
| WO2017031798A1 (en) | Apparatus for treating and recycling aluminum electrolysis solid waste | |
| Zhao et al. | Recycling and utilization of spent potlining by different high temperature treatments | |
| CN110482503A (en) | A kind of method of Quadratic aluminum dust comprehensive utilization of resources | |
| CN109182733B (en) | Smelting process of magnesium-containing hazardous waste/solid waste | |
| CN112453009A (en) | Method for green harmless resource utilization of aluminum ash | |
| CN105460926B (en) | A kind of native graphite is without boat purifying process | |
| CN206069804U (en) | With the anthracitic system of electrolytic aluminium waste cathode carbon block production high graphite | |
| CN101435020B (en) | Method for producing titanium-rich material from titanium ore concentrate | |
| CN107140718A (en) | A kind of utilize couples the method that external field treatment red mud prepares iron aluminium flocculating agent | |
| CN102382992A (en) | Method for treating high-antimony low-silver-tin anode slime | |
| CN104446363A (en) | Method of preparing ceramsite from manganese carbonate residues | |
| CN104651554B (en) | A kind of steel slag cracking granulating method | |
| CN203725483U (en) | Pyrolysis system for aluminum electrolysis waste tank lining | |
| CN114888036B (en) | Method for cooperatively recycling aluminum electrolysis overhaul slag and mining and metallurgy slag | |
| CN105908217A (en) | Method for using waste cathode carbon block of aluminum cell for manufacturing side carbon block | |
| CN109609776A (en) | A method of copper cobalt in copper vessel slag is extracted using waste cathode of aluminum electrolytic cell carbon block | |
| CN105236784A (en) | Preparation method of composite tailing slag active micro-powder for concrete admixture | |
| CN207527596U (en) | Electrolytic aluminium waste slot liner innocuity disposal system | |
| CN107117630A (en) | It is a kind of to be calcined the method that illite efficiently carries potassium | |
| CN113213500A (en) | Energy-saving coal gangue flint clay based manufacturing method |
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 |