CN113621794B - Method for full-resource cooperative utilization of gas ash and coal gangue - Google Patents
Method for full-resource cooperative utilization of gas ash and coal gangue Download PDFInfo
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- CN113621794B CN113621794B CN202110962203.9A CN202110962203A CN113621794B CN 113621794 B CN113621794 B CN 113621794B CN 202110962203 A CN202110962203 A CN 202110962203A CN 113621794 B CN113621794 B CN 113621794B
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- gas ash
- coal gangue
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- 239000003245 coal Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 38
- 239000004484 Briquette Substances 0.000 claims abstract description 17
- 238000007885 magnetic separation Methods 0.000 claims abstract description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 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 9
- 229910052786 argon Inorganic materials 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 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
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 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
- 239000012300 argon atmosphere Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000010881 fly ash Substances 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
- 238000004064 recycling Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 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
- 239000004615 ingredient Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 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
- 238000012545 processing Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
Abstract
The invention relates to a method for full-resource cooperative utilization of gas ash and coal gangue, which comprises the following steps: (1) Grinding the gas ash and the coal gangue to powder with the particle size of 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 briquette; (2) Drying the mixed briquette prepared in the step (1); (3) Placing the mixed briquette obtained in the step (2) into a heating furnace, reacting for 90-180 min at 1120-1360 ℃, 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, magnetic separation and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder, and obtaining tailings with high alumina content; the method can synchronously realize the full-resource high-added-value utilization of the gas ash and the coal gangue on the premise of not adding the carbonaceous reducing agent.
Description
Technical Field
The invention relates to the technical field of metallurgical solid waste resource utilization, in particular to a method for full resource cooperative utilization of gas ash and coal gangue.
Background
Blast furnace gas ash is one of metallurgical solid wastes generated in the blast furnace smelting process. According to measurement and calculation of about 20kg of blast furnace gas ash produced per ton of iron smelting, the amount of gas ash produced in China per year can reach tens of millions of tons. If the processing is improper, the huge waste of resources is caused. Meanwhile, the influence on the ecological environment is serious, and the method is an important problem which each iron and steel enterprise must face.
The gangue is solid waste discharged in the coal mining process and the coal washing process, and is a black 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 gangue is not used for disposal, occupies a large piece of land and can pollute the atmosphere, farmlands and water bodies. The coal gangue is stored in China to more than 10 hundred million tons, and 1 hundred million tons of coal gangue are discharged each year.
The main component of the gas ash is ferric oxide, and contains a certain amount of silicon dioxide, aluminum oxide and fixed carbon. The total content of silicon dioxide, ferric oxide and aluminum oxide in the gangue is more than 80 percent, and the gangue contains a certain fixed carbon. Through literature search, fe 2 O 3 Can effectively promote SiO 2 Reducing the reaction temperature, and synchronously separating Al 2 O 3 (Yu Wenzhou, li Jie, you Zhixiong, dang Jie, lv Xuewei. Investigation of the carbothermic reduction of fly ash to ferrosilicon [ C ]]V/eleventh chinese steel annual meeting).
With the continuous increase of national environmental protection law enforcement, the requirements of people on environmental quality are continuously improved. If the method can realize the synergic reclamation and high added value utilization of various solid wastes based on the characteristics of solid waste resources of the gas ash and the coal gangue, the interaction of the respective components can be fully exerted, and the carbonaceous reducing agent can be not 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 the green development of the social ecology.
Disclosure of Invention
The invention aims at providing a method for full-resource cooperative utilization of gas ash and coal gangue, which 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 method for full-resource cooperative utilization of gas ash and coal gangue specifically comprises the following steps:
(1) Grinding the gas ash and the coal gangue to powder with the particle size of 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 briquette;
(2) Drying the mixed briquette prepared in the step (1);
(3) Placing the mixed briquette obtained in the step (2) into a heating furnace, reacting for 90-180 min at 1120-1360 ℃, continuously introducing argon into the heating furnace in the heating process, and enabling the whole reaction to be completed under the argon atmosphere, or maintaining a certain vacuum degree in the heating furnace, so that the reaction is completed in a vacuum environment;
(4) Crushing, grinding, magnetic separation and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder, and obtaining tailings with high alumina content.
Further, the proportioning mass ratio of the gas ash to the coal gangue is 4-6: 5.
further, the binder in the invention is polyvinyl alcohol with the 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.
Furthermore, the mixed briquette is required to be dried in an oven at the drying temperature of 110-130 ℃ for 3-4 h.
Further, in the invention, if argon is introduced 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 and Pa, the reduction temperature is 1120-1200 ℃, and the reduction time is 150-180 min.
Further, in the step (4), the reduced product is crushed and ground to a granularity of less than 200 meshes and accounts for more than 85% of the total mass of the reduced product, and wet magnetic separation is adopted for magnetic separation, wherein the magnetic field strength is as follows: 0.08-0.11T.
Further, in the powdery ferrosilicon alloy obtained in the step (4), the silicon content is 18-22%, and the alumina content in the tailings left 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 fully recycling and cooperatively utilizing the gas ash and the coal gangue provided by the invention adopts metallurgical solid waste as a main raw material, fully plays the reduction effect of carbon-containing components in the gas ash and the coal gangue, realizes the 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 relates to a method for full resource co-utilization of gas ash and coal gangue, which specifically comprises the following steps:
(1) Grinding the gas ash and the coal gangue to powder with the particle size of 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 briquette;
(2) Drying the mixed briquette prepared in the step (1);
(3) Placing the mixed briquette obtained in the step (2) into a heating furnace, reacting for 90-180 min at 1120-1360 ℃, continuously introducing argon into the heating furnace in the heating process, and enabling the whole reaction to be completed under the argon atmosphere, or maintaining a certain vacuum degree in the heating furnace, so that the reaction is completed in a vacuum environment;
(4) Crushing, grinding, magnetic separation and drying the co-reduction product obtained in the step (3) to obtain ferrosilicon alloy powder, and obtaining tailings with high alumina content.
Further, in this embodiment, the ratio of the ingredients of the gas ash to the coal gangue is 4-6: 5.
further, the binder in this embodiment 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.
Further, in this embodiment, the mixed briquette is required to be dried in an oven at a drying temperature of 110 to 130 ℃ for a drying time of 3 to 4h.
Further, in this embodiment, if argon is introduced 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 and 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 less than 200 meshes and accounts for more than 85% of the total mass of the reduced product, and the magnetic separation adopts wet 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 silicon content is 18-22%, and the alumina content 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 scheme of the invention is described below in connection with specific embodiments.
Example 1:
(1) Grinding the gas ash and the gangue respectively to powder with the particle size of more than 200 meshes. Then adding a binder, fully and uniformly mixing, and pressing into a cylindrical mixed pressing block; wherein, the batching mass ratio of the gas ash to 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 percentage of the gas ash is as follows: siO (SiO) 2 8.72%，Al 2 O 3 7.06%，Fe 2 O 3 56.90%, caO 3.06%, mgO 0.96% and fixed carbon 27.60%. The main mass percentage of the gangue is as follows: siO (SiO) 2 52.17%，Al 2 O 3 25.66%，Fe 2 O 3 12.10%, mgO 0.64% and fixed carbon 24.70%.
(2) Drying the mixed briquette in the step (1) at 130 ℃ for 3 h, and removing redundant water.
(3) And (3) reducing the mixed pressing block dried in the step (2) at the temperature of 1280 ℃ for 120min, and introducing argon for protecting the whole process.
(4) Crushing and grinding the co-reduction product obtained in the step (3) until the granularity is less than 200 meshes and accounts for more than 85% of the total mass of the reduction product, and then adopting wet magnetic separation to obtain ferrosilicon alloy powder, wherein the magnetic field strength is as follows: 0.10 T.
The obtained powdery ferrosilicon alloy has the silicon content of 21.26 percent, and meanwhile, the residual tailings after magnetic separation contain 75.82 percent of alumina.
Example 2:
(1) Grinding the gas ash and the gangue respectively to powder with the particle size of more than 200 meshes. Then adding a binder, fully and uniformly mixing, and pressing into a cylindrical pressing block; wherein, the batching mass ratio of the gas ash to the coal gangue is 6:5. the binder is polyvinyl alcohol with the mass fraction of 16%, and the addition amount is 14 and wt% of the total mass of the gas ash and the fly ash.
The main raw material components are as follows: the main mass percentage of the gas ash is as follows: siO (SiO) 2 8.72%，Al 2 O 3 7.06%，Fe 2 O 3 56.90%, caO 3.06%, mgO 0.96% and fixed carbon 27.60%. The main mass percentage of the gangue is as follows: siO (SiO) 2 52.17%，Al 2 O 3 25.66%，Fe 2 O 3 12.10%, mgO 0.64% and fixed carbon 24.70%.
(2) Drying the mixed briquette in the step (1) at 120 ℃ for 3.5 h, and removing redundant water.
(3) And (3) placing the mixed pressing block dried in the step (2) in a vacuum heating furnace, reducing for 150 min at the temperature of 1200 ℃, and maintaining the whole-course vacuum degree at 5-15 Pa.
(4) Crushing and grinding the reduced product obtained in the step (3) to a granularity of less than 200 meshes and accounting for more than 85% of the total mass of the reduced product, and then adopting wet magnetic separation to obtain ferrosilicon alloy powder, wherein the magnetic field strength is as follows: 0.08 T.
The obtained powdery ferrosilicon alloy has a silicon content of 20.47%. Meanwhile, the residual tailings after magnetic separation contain 78.21% of alumina.
Compared with the prior art, the method for fully recycling and cooperatively utilizing the gas ash and the coal gangue provided by the invention adopts metallurgical solid waste as a main raw material, fully plays the reduction effect of carbon-containing components in the gas ash and the coal gangue, realizes the 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 (3)
1. A method for full-resource cooperative utilization 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 the particle size of 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 briquette;
(2) Drying the mixed briquette prepared in the step (1);
(3) Putting the mixed briquette obtained in the step (2) into a heating furnace, and introducing argon for protection in the whole process, wherein the reduction temperature is 1260-1360 ℃ and the reduction time is 90-120 min; or vacuumizing, wherein the vacuum degree is controlled to be 5-15 Pa, the reduction temperature is 1120-1200 ℃, and the reduction time is 150-180 min;
(4) Crushing and grinding the co-reduction product obtained in the step (3) to a granularity of less than 200 meshes and accounting for more than 85% of the total mass of the reduction product, and magnetically separating and drying to obtain ferrosilicon alloy powder, wherein wet magnetic separation is adopted for magnetic separation, and the magnetic field strength is as follows: 0.08-0.11T, and obtaining tailings with high alumina content;
the proportioning mass ratio of the gas ash to the coal gangue is 4-6:5;
the binder is polyvinyl alcohol with the mass fraction of 14-16%, and the addition amount is 14-16% of the total mass of the gas ash and the coal gangue.
2. The method for full resource co-utilization of gas ash and coal gangue according to claim 1, wherein the mixed briquette is subjected to drying treatment in an oven at 110-130 ℃ for 3-4 h.
3. The method for full resource co-utilization of gas ash and coal gangue according to claim 1, wherein the silicon content in the powdery ferrosilicon alloy 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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| Application Number | Priority Date | Filing Date | Title |
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| CN202110962203.9A CN113621794B (en) | 2021-08-20 | 2021-08-20 | Method for full-resource cooperative utilization of gas ash and coal gangue |
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| CN202110962203.9A CN113621794B (en) | 2021-08-20 | 2021-08-20 | Method for full-resource cooperative utilization of gas ash and coal gangue |
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| Publication Number | Publication Date |
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| CN113621794A CN113621794A (en) | 2021-11-09 |
| CN113621794B true CN113621794B (en) | 2023-10-20 |
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| 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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- 2021-08-20 CN CN202110962203.9A patent/CN113621794B/en active Active
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.配料对陶粒硼化作用的影响.《固体废弃物处理》.吉林大学出版社,2013,第287页. * |
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Inventor after: Lei Jialiu Inventor after: Hu Ke Inventor after: Chen Yuhang Inventor after: Jiang Kun Inventor after: Wu Qianlong Inventor after: Xiao Mengmeng Inventor after: Jiang Xuanqi Inventor before: Hu Ke Inventor before: Lei Jialiu Inventor before: Chen Yuhang Inventor before: Jiang Kun Inventor before: Wu Qianlong Inventor before: Xiao Mengmeng Inventor before: Jiang Xuanqi |
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