CN113621794A - Full-resource cooperative utilization method for gas ash and coal gangue - Google Patents
Full-resource cooperative utilization method for gas ash and coal gangue Download PDFInfo
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- CN113621794A CN113621794A CN202110962203.9A CN202110962203A CN113621794A CN 113621794 A CN113621794 A CN 113621794A CN 202110962203 A CN202110962203 A CN 202110962203A CN 113621794 A CN113621794 A CN 113621794A
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- 239000003245 coal Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 42
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000003825 pressing Methods 0.000 claims abstract description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 230000009467 reduction Effects 0.000 claims description 14
- 238000007885 magnetic separation Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 9
- 230000002195 synergetic effect Effects 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000012300 argon atmosphere Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract description 5
- 239000002956 ash Substances 0.000 description 29
- 239000002910 solid waste Substances 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 229910052799 carbon Inorganic materials 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910000676 Si alloy Inorganic materials 0.000 description 3
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000013332 literature search Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
-
- 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
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
The invention relates to a full resource cooperative utilization method of gas ash and coal gangue, which specifically comprises the following steps: (1) grinding the gas ash and the coal gangue to powder with more than 200 meshes respectively, adding a certain amount of binder, fully and uniformly mixing according to a certain proportion, and pressing into a cylindrical mixed pressing block; (2) drying the mixed briquettes prepared in the step (1); (3) putting the mixed pressing block obtained in the step (2) into a heating furnace, reacting for 90-180 min at the temperature of 1120-1360 ℃, and continuously introducing argon into the heating furnace in the heating process or maintaining a certain vacuum degree in the heating furnace to complete the reaction in a vacuum environment; (4) crushing, grinding, magnetically separating and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder and tailings with high alumina content; the method can synchronously realize full-resource high-added-value utilization of the gas ash and the coal gangue on the premise of not adding a carbonaceous reducing agent.
Description
Technical Field
The invention relates to the technical field of metallurgical solid waste resource utilization, in particular to a full resource cooperative utilization method of gas ash and coal gangue.
Background
Blast furnace gas ash is one of the metallurgical solid wastes generated in the blast furnace smelting process. According to the measurement of about 20kg of blast furnace gas ash generated by smelting each ton of iron, the gas ash amount generated in China every year can reach ten million tons. If the treatment is not proper, the resource is wasted greatly. Meanwhile, the influence on the ecological environment is also serious, and the method is an important problem which each iron and steel enterprise must face.
The coal gangue is solid waste discharged in the coal mining process and the coal washing process, and is a black and gray rock which has lower carbon content and is harder than coal and is associated with a coal bed in the coal forming process. The coal gangue is not used for disposal, occupies a large area of land, and can pollute the atmosphere, farmlands and water bodies. The coal gangue accumulated in China is more than 10 hundred million tons, and 1 hundred million tons of coal gangue are discharged every year.
The gas ash contains ferric oxide as main component and certain amount of silicon dioxide, aluminum oxide and fixed carbon. The coal gangue contains more than 80 percent of silicon dioxide, ferric oxide and aluminum oxide, and contains certain fixed carbon. Found by literature search, Fe2O3Can effectively promote SiO2Reduction of (2), lowering of reaction temperature, and simultaneous separation of Al2O3(research on preparation of ferrosilicon alloy by carbothermic reduction of fly ash [ C]// eleventh China annual meeting of steels).
With the increasing of the national environmental protection law enforcement force, the requirement of people on the environmental quality is continuously improved. If the synergistic recycling and high-added-value utilization of various solid wastes can be realized based on the characteristics of the gas ash and coal gangue solid waste resources, not only can the interaction of respective components be fully exerted, but also a carbonaceous reducing agent can not be added in the reduction process, so that the production cost and the energy consumption are greatly reduced, and the method has great significance for realizing green development of social ecology.
Disclosure of Invention
The invention aims to provide a method for full-resource cooperative utilization of gas ash and coal gangue, aiming at the situation, and the method can synchronously realize full-resource high-added-value utilization of the gas ash and the coal gangue on the premise of not adding a carbonaceous reducing agent.
The specific scheme of the invention is as follows: a full resource cooperative utilization method of gas ash and coal gangue specifically comprises the following steps:
(1) grinding the gas ash and the coal gangue to powder with more than 200 meshes respectively, adding a certain amount of binder, fully and uniformly mixing according to a certain proportion, and pressing into a cylindrical mixed pressing block;
(2) drying the mixed briquettes prepared in the step (1);
(3) putting the mixed pressing block obtained in the step (2) into a heating furnace, reacting for 90-180 min at the temperature of 1120-1360 ℃, continuously introducing argon into the heating furnace in the heating process, and completing the reaction in an argon atmosphere in the whole reaction process, or maintaining a certain vacuum degree in the heating furnace to complete the reaction in a vacuum environment;
(4) and (4) crushing, grinding, magnetically separating and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder and tailings with high alumina content.
Further, the gas ash and the coal gangue are mixed according to a mass ratio of 4-6: 5.
further, the binder is polyvinyl alcohol with the mass fraction of 14-16%, and the addition amount of the binder is 14-16 wt% of the total mass of the gas ash and the coal gangue.
Further, the mixed pressed block needs to be dried in an oven, the drying temperature is 110-130 ℃, and the drying time is 3-4 hours.
Further, if argon is introduced for protection in the whole process, the reduction temperature is 1260-1360 ℃, and the reduction time is 90-120 min; if the vacuum is pumped, the vacuum degree is controlled to be 5-15 Pa, the reduction temperature is 1120-1200 ℃, and the reduction time is 150-180 min.
Further, in the step (4) of the invention, the reduced product is crushed and ground to a particle size of less than 200 meshes which accounts for more than 85% of the total mass of the reduced product, wet magnetic separation is adopted for the magnetic separation, and the magnetic field strength is as follows: 0.08-0.11T.
Further, in the powdered ferrosilicon alloy obtained in the step (4), the silicon content is 18-22%, and the alumina content in the tailings after magnetic separation is more than 75%.
In the above description, min represents minutes, h represents hours, wt% represents weight percent, Pa represents pressure, and T represents magnetic field strength.
Compared with the prior art, the method for full-resource synergistic utilization of the gas ash and the coal gangue provided by the invention adopts metallurgical solid wastes as main raw materials, simultaneously fully exerts the reducing action of carbon-containing components in the gas ash and the coal gangue, realizes comprehensive high-added-value utilization of various solid wastes without adding a carbonaceous reducing agent, has the advantages of low cost, large solid waste absorption, high comprehensive utilization rate and the like, and has good practical use value and economic value.
Drawings
FIG. 1 is a schematic diagram of the process flow structure of the present invention.
Detailed Description
Referring to fig. 1, the invention is a full resource cooperative utilization method of gas ash and coal gangue, which specifically comprises the following steps:
(1) grinding the gas ash and the coal gangue to powder with more than 200 meshes respectively, adding a certain amount of binder, fully and uniformly mixing according to a certain proportion, and pressing into a cylindrical mixed pressing block;
(2) drying the mixed briquettes prepared in the step (1);
(3) putting the mixed pressing block obtained in the step (2) into a heating furnace, reacting for 90-180 min at the temperature of 1120-1360 ℃, continuously introducing argon into the heating furnace in the heating process, and completing the reaction in an argon atmosphere in the whole reaction process, or maintaining a certain vacuum degree in the heating furnace to complete the reaction in a vacuum environment;
(4) and (4) crushing, grinding, magnetically separating and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder and tailings with high alumina content.
Further, in the embodiment, the ratio of the ingredients of the gas ash to the coal gangue by mass is 4-6: 5.
further, in the embodiment, the binder is polyvinyl alcohol with a mass fraction of 14-16%, and the addition amount of the binder is 14-16 wt% of the total mass of the gas ash and the coal gangue.
Further, in the embodiment, the mixed briquettes need to be dried in an oven, the drying temperature is 110-130 ℃, and the drying time is 3-4 hours.
Further, in the embodiment, if argon is introduced for protection in the whole process, the reduction temperature is 1260-1360 ℃, and the reduction time is 90-120 min; if the vacuum is pumped, the vacuum degree is controlled to be 5-15 Pa, the reduction temperature is 1120-1200 ℃, and the reduction time is 150-180 min.
Further, in the step (4) in this embodiment, the reduced product is crushed and ground to a particle size of less than 200 meshes, which accounts for more than 85% of the total mass of the reduced product, wet magnetic separation is adopted for the magnetic separation, and the magnetic field strength is as follows: 0.08-0.11T.
Further, in the powdered ferrosilicon alloy obtained in the step (4) in this embodiment, the content of silicon is 18 to 22%, and the content of alumina in the tailings remaining after magnetic separation is more than 75%.
In the above description, min represents minutes, h represents hours, wt% represents weight percent, Pa represents pressure, and T represents magnetic field strength.
The technical means of the present invention will be described below with reference to specific embodiments.
Example 1:
(1) grinding the gas ash and the coal gangue respectively to form powder with more than 200 meshes. Then adding a binder, fully and uniformly mixing, and pressing into a cylindrical mixed pressing block; wherein, the weight ratio of the ingredients of the gas ash and the coal gangue is 4: 5, the binder is polyvinyl alcohol with the mass fraction of 15%, and the addition amount is 15 wt% of the total mass of the gas ash and the coal gangue.
The main raw material components are as follows: the main mass percent of the gas ash is as follows: SiO 22 8.72%，Al2O3 7.06%，Fe2O356.90%, CaO 3.06%, MgO 0.96%, fixed carbon 27.60%. The main mass percentage of the coal gangue is as follows: SiO 22 52.17%，Al2O325.66%，Fe2O312.10%, MgO 0.64%, fixed carbon 24.70%.
(2) And (2) drying the mixed briquettes in the step (1) at the temperature of 130 ℃ for 3 h, and removing redundant water.
(3) And (3) reducing the mixed briquettes dried in the step (2) at 1280 ℃ for 120 min, and introducing argon for protection in the whole process.
(4) Crushing and grinding the co-reduction product obtained in the step (3) to a particle size of less than 200 meshes which accounts for more than 85% of the total mass of the reduction product, and then carrying out wet magnetic separation to obtain ferrosilicon alloy powder, wherein the magnetic field strength is as follows: 0.10T.
The silicon content of the obtained powdery iron-silicon alloy is 21.26 percent, and meanwhile, the tailings left after magnetic separation contain alumina 75.82 percent.
Example 2:
(1) grinding the gas ash and the coal gangue respectively to form powder with more than 200 meshes. Then adding a binder, fully and uniformly mixing, and pressing into a cylindrical briquette; wherein, the weight ratio of the ingredients of the gas ash and the coal gangue is 6: 5. the adhesive is polyvinyl alcohol with the mass fraction of 16%, and the addition amount of the adhesive is 14 wt% of the total mass of the gas ash and the fly ash.
The main raw material components are as follows: the main mass percent of the gas ash is as follows: SiO 22 8.72%，Al2O3 7.06%，Fe2O356.90%, CaO 3.06%, MgO 0.96%, fixed carbon 27.60%. The main mass percentage of the coal gangue is as follows: SiO 22 52.17%，Al2O325.66%，Fe2O312.10%, MgO 0.64%, fixed carbon 24.70%.
(2) And (2) drying the mixed briquettes in the step (1) at the temperature of 120 ℃ for 3.5 hours, and removing redundant water.
(3) And (3) placing the mixed briquettes dried in the step (2) in a vacuum heating furnace to reduce for 150 min at the temperature of 1200 ℃, and maintaining the vacuum degree of 5-15 Pa in the whole process.
(4) Crushing and grinding the reduced product obtained in the step (3) to a granularity smaller than 200 meshes which accounts for more than 85% of the total mass of the reduced product, and then performing wet magnetic separation to obtain iron-silicon alloy powder, wherein the magnetic field strength is as follows: 0.08T.
The silicon content of the obtained powdery iron-silicon alloy is 20.47 percent. Meanwhile, the tailings left after magnetic separation contain 78.21% of alumina.
Compared with the prior art, the method for full-resource synergistic utilization of the gas ash and the coal gangue provided by the invention adopts metallurgical solid wastes as main raw materials, simultaneously fully exerts the reducing action of carbon-containing components in the gas ash and the coal gangue, realizes comprehensive high-added-value utilization of various solid wastes without adding a carbonaceous reducing agent, has the advantages of low cost, large solid waste absorption, high comprehensive utilization rate and the like, and has good practical use value and economic value.
Claims (7)
1. A full resource cooperative utilization method of gas ash and coal gangue is characterized by comprising the following steps:
(1) grinding the gas ash and the coal gangue to powder with more than 200 meshes respectively, adding a certain amount of binder, fully and uniformly mixing according to a certain proportion, and pressing into a cylindrical mixed pressing block;
(2) drying the mixed briquettes prepared in the step (1);
(3) putting the mixed pressing block obtained in the step (2) into a heating furnace, reacting for 90-180 min at the temperature of 1120-1360 ℃, continuously introducing argon into the heating furnace in the heating process, and completing the reaction in an argon atmosphere in the whole reaction process, or maintaining a certain vacuum degree in the heating furnace to complete the reaction in a vacuum environment;
(4) and (4) crushing, grinding, magnetically separating and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder and tailings with high alumina content.
2. The method for full-resource synergistic utilization of gas ash and coal gangue as claimed in claim 1, wherein the mass ratio of ingredients of the gas ash to the coal gangue is 4-6: 5.
3. the method for full-resource synergistic utilization of the gas ash and the coal gangue as claimed in claim 1, wherein the binder is polyvinyl alcohol with a mass fraction of 14-16%, and the addition amount is 14-16 wt% of the total mass of the gas ash and the coal gangue.
4. The method for full-resource synergistic utilization of gas ash and coal gangue as claimed in claim 1, wherein the mixed briquettes are dried in an oven at a temperature of 110-130 ℃ for 3-4 h.
5. The method for full-resource cooperative utilization of the gas ash and the coal gangue as claimed in claim 1, wherein if argon is introduced for protection in the whole process, the reduction temperature is 1260-1360 ℃, and the reduction time is 90-120 min; if the vacuum is pumped, the vacuum degree is controlled to be 5-15 Pa, the reduction temperature is 1120-1200 ℃, and the reduction time is 150-180 min.
6. The method for full resource cooperative utilization of the gas ash and the coal gangue as claimed in claim 1, wherein in the step (4), the reduced product is crushed and ground to a particle size of less than 200 meshes which accounts for more than 85% of the total mass of the reduced product, wet magnetic separation is adopted for the magnetic separation, and the magnetic field strength is as follows: 0.08-0.11T.
7. The method for full-resource synergistic utilization of the gas ash and the coal gangue as claimed in claim 1, wherein the silicon content in the powdery ferrosilicon obtained in the step (4) is 18-22%, and the alumina content in the tailings left after magnetic separation is more than 75%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109885A (en) * | 2022-07-06 | 2022-09-27 | 湖北理工学院 | Microwave coreduction of gas ash and Bayer process red mud to prepare iron-silicon alloy and separate Al 2 O 3 Method (2) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392125A (en) * | 2011-10-25 | 2012-03-28 | 内蒙古科技大学 | Technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge |
| CN110814359A (en) * | 2019-10-18 | 2020-02-21 | 东北大学 | Method for producing reduced iron powder by using coal gangue through self-heating reduction |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392125A (en) * | 2011-10-25 | 2012-03-28 | 内蒙古科技大学 | Technology for recovering iron ore concentrate and coke powder from blast furnace gas dust or gas sludge |
| CN110814359A (en) * | 2019-10-18 | 2020-02-21 | 东北大学 | Method for producing reduced iron powder by using coal gangue through self-heating reduction |
Non-Patent Citations (1)
| Title |
|---|
| 张鸿波: "《固体废弃物处理》", 31 July 2013, 吉林大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115109885A (en) * | 2022-07-06 | 2022-09-27 | 湖北理工学院 | Microwave coreduction of gas ash and Bayer process red mud to prepare iron-silicon alloy and separate Al 2 O 3 Method (2) |
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