CN112941331A - Method and system for treating electric furnace ash based on smelting reduction method - Google Patents
Method and system for treating electric furnace ash based on smelting reduction method Download PDFInfo
- Publication number
- CN112941331A CN112941331A CN202110119125.6A CN202110119125A CN112941331A CN 112941331 A CN112941331 A CN 112941331A CN 202110119125 A CN202110119125 A CN 202110119125A CN 112941331 A CN112941331 A CN 112941331A
- Authority
- CN
- China
- Prior art keywords
- smelting
- electric furnace
- reducing agent
- slag
- dust
- 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
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000003723 Smelting Methods 0.000 title claims abstract description 40
- 230000009467 reduction Effects 0.000 title claims abstract description 15
- 239000000428 dust Substances 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 14
- 239000011701 zinc Substances 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 230000004907 flux Effects 0.000 claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003546 flue gas Substances 0.000 claims abstract description 8
- 239000011490 mineral wool Substances 0.000 claims abstract description 8
- 239000008188 pellet Substances 0.000 claims abstract description 8
- 239000000853 adhesive Substances 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 7
- 238000005453 pelletization Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000000571 coke Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000002210 silicon-based material Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229920000881 Modified starch Polymers 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 14
- 239000002910 solid waste Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003034 coal gas Substances 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract description 2
- 238000005469 granulation Methods 0.000 abstract description 2
- 230000003179 granulation Effects 0.000 abstract description 2
- 238000009270 solid waste treatment Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910001308 Zinc ferrite Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052656 albite Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- WGEATSXPYVGFCC-UHFFFAOYSA-N zinc ferrite Chemical compound O=[Zn].O=[Fe]O[Fe]=O WGEATSXPYVGFCC-UHFFFAOYSA-N 0.000 description 1
Images
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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/12—Making spongy iron or liquid steel, by direct processes in electric furnaces
-
- 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
- C22B1/02—Roasting processes
-
- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/34—Obtaining zinc oxide
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry 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 and a system for treating electric furnace dust based on a smelting reduction method, and belongs to the technical field of metallurgical solid waste treatment. The methodThe method comprises the following steps: uniformly mixing the electric furnace ash, the internal reducing agent, the adhesive and water, pelletizing and drying to obtain pellets; smelting the pellets, adding a flux, an externally-prepared reducing agent and a slag former in stages during smelting, and respectively obtaining zinc-containing flue gas, molten iron and furnace slag after smelting. The method uses electricity as main energy source, gets rid of adherence to gas such as coal gas, and reduces CO2The method overcomes the defects of long flow and high energy consumption, and is a green energy-saving environment-friendly electric furnace ash disposal process. The main products are molten iron and zinc oxide powder, the dezincification rate is more than 95%, the purity of the obtained zinc oxide powder is more than 70%, meanwhile, the rock wool is prepared by effectively utilizing the residual heat of molten slag through centrifugal granulation, the full treatment and resource utilization of metallurgical solid waste are realized, the utilization rate and economic value of the metallurgical solid waste are further improved, and the method has wide market application prospect.
Description
Technical Field
The invention belongs to the technical field of metallurgical solid waste treatment, and particularly relates to a method and a system for treating electric furnace ash based on a smelting reduction method.
Background
In 2020, the overall production capacity of steel in China is about 11 hundred million tons, wherein the short-process electric furnace smelting capacity is about 1 million tons, and is increased by about 2000 ten thousand tons compared with 2019. Different types of solid wastes such as zinc-containing dust and iron-containing dust can be generated in the steel smelting process. According to statistics, about 10-20kg of electric furnace dust is generated by a ton of steel in a short process, about 200 ten thousand tons of electric furnace dust is generated by accumulation in the whole country in 2020, and the mass fractions of zinc and iron can reach more than 20%.
Currently, the mainstream processes for the current disposal of metallurgical iron and zinc containing dust include: 1) the rotary kiln treatment process has the advantages of low cost and mature technology; the disadvantages are high energy consumption, poor production stability, easy ring formation and need of flue gas desulfurization and denitration facilities. 2) The rotary hearth furnace treatment process has the advantages of high dezincification rate, stable process operation, strong raw material adaptability and small environmental pollution; the disadvantages are high investment cost, long flow path and coal gas dependence of fuel. 3) The wet treatment process, the existing wet treatment process for the electric furnace ash is mainly divided into an acid method and an ammonia method, and has the advantages that the purity of the obtained zinc oxide is high, and the added value of the product is high; the disadvantages are that the treatment capacity is small, the corrosion of equipment is serious, and part of the zinc-containing material (zinc ferrite) is difficult to degrade. Therefore, although the treatment processes of the electric furnace ash are many, how to realize the optimization of the treatment process and the maximization of the economic benefit of the product still needs to be solved.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for treating electric furnace ash based on a smelting reduction method; the second purpose is to provide a system for treating the electric furnace ash based on a smelting reduction method.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a method for treating electric furnace dust based on a smelting reduction method, which comprises the following steps:
uniformly mixing the electric furnace ash, the internal reducing agent, the adhesive and water, pelletizing and drying to obtain pellets; smelting the pellets, adding a flux, an externally-prepared reducing agent and a slag former in stages during smelting, and respectively obtaining zinc-containing flue gas, molten iron and furnace slag after smelting.
Preferably, the method further comprises filtering and enriching the zinc-containing flue gas to obtain zinc oxide powder; and granulating the slag to obtain the rock wool.
Preferably, the mass ratio of the electric furnace ash, the internally-prepared reducing agent, the adhesive and the water is 100:5-10:1-5: 6-12.
Preferably, the pellet radius is 3-5cm, and the compressive strength is not lower than 150N.
Preferably, the mass ratio of the electric furnace ash, the flux, the externally-prepared reducing agent and the slagging agent is 100:3-8:2-10: 15-30.
Preferably, the step of adding the flux, the externally-prepared reducing agent and the slagging agent by stages specifically comprises the following steps: adding a fusing agent in the melting period of 1200-1300 ℃, adding an externally-matched reducing agent in the reduction period of 1300-1500 ℃, and adding a slagging agent in the slagging period of more than 1500 ℃.
Preferably, the content of zinc oxide in the electric furnace ash is 15-30 wt%, and the content of iron oxide is 20-40 wt%; the internal reducing agent is coal powder or coke powder; the adhesive is bentonite or pregelatinized starch; the flux is a calcium-based material or a K, Na-containing light metal material; the externally-prepared reducing agent is coke or coke; the slagging agent is a silicon-based material.
Preferably, the calcium-based material is fluorite, limestone or dolomite.
Preferably, the K, Na-containing light metal material is sodium carbonate, potassium feldspar, albite or kaliophilite.
Preferably, the silicon-based material is silica, glass fiber or quartz sand.
Preferably, the zinc-containing flue gas is filtered and enriched by a cloth bag of a dust collector to obtain zinc oxide powder; and (4) centrifugally granulating the slag to obtain the rock wool.
2. A system for treating electric furnace dust based on a smelting reduction method sequentially comprises a pelletizing system, a smelting system and a molten iron collecting system, wherein the smelting system is connected with a dust removal system and a slag disposal system.
Preferably, the balling system is formed by connecting a mixer, a balling machine, a dryer and a distributor in sequence; smelting in the smelting system by using an electric furnace; and a bag-type dust remover is used for removing dust in the dust removing system.
The invention has the beneficial effects that: compared with the traditional fire method or wet method electric furnace ash disposal process, the method takes electricity as main energy, gets rid of the attachment of gas and other fuel gases, reduces CO2The method overcomes the defects of long flow and high energy consumption, and is a green energy-saving environment-friendly electric furnace ash disposal process. The main products are molten iron and zinc oxide powder, the dezincification rate is more than 95%, the purity of the obtained zinc oxide powder is more than 70%, meanwhile, the rock wool is prepared by effectively utilizing the residual heat of molten slag through centrifugal granulation, the full treatment and resource utilization of the metallurgical solid waste are realized, the utilization rate and the economic value of the metallurgical solid waste are further improved, and the wide market application prospect is achieved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a system for treating electric furnace dust based on a smelting reduction process according to the present invention;
FIG. 2 is a flow chart of the process for treating the electric furnace ash based on the smelting reduction method in the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
FIG. 1 is a schematic view of a system for treating electric furnace dust based on a smelting reduction process according to the present invention, which includes a pelletizing system, a smelting system, and a molten iron collecting system, wherein the smelting system is connected to a dust removal system and a slag disposal system; the balling system is formed by connecting a mixer, a balling machine, a dryer and a distributor in sequence; smelting in a smelting system by using an electric furnace; and a bag-type dust remover is used for removing dust in the dust removing system.
Example 1
The electric furnace ash is treated based on a smelting reduction method, and the treatment process flow is shown in figure 2:
adding electric furnace ash, coal powder, bentonite and water into a proportioning machine in sequence, mixing uniformly in a mixer according to a mass ratio of 100:8:3:11, then putting the mixture into a ball forming machine for ball forming, drying the ball by a dryer to obtain a ball with a radius of 3-5cm and a compressive strength of not less than 150N, thereby ensuring the strength of the ball, reducing the pulverization rate and simultaneously considering the air permeability, volatilizing zinc vapor, adding the obtained ball into the electric furnace for smelting, adding fluorite with 5% of electric furnace ash content during the smelting period of 1200-1300 ℃, adding coke with 2% of electric furnace ash content during the reduction period of 1300-1500 ℃, adding silica with 20% of electric furnace ash content during the slagging period of more than 1500 ℃, respectively obtaining zinc-containing smoke, molten iron and slag after smelting, collecting by using a molten iron collector, adding a proper amount of smoke into a cold air, then putting the smoke into a bag dust collector for filtering and enriching, obtaining zinc oxide powder, and centrifugally granulating the slag to obtain the rock wool.
TABLE 1 main ingredient table contained in electric furnace dust
The test shows that the zinc removal rate>95 percent, the purity of the obtained zinc oxide powder is about 75 percent, the mass fraction of iron in the slag is 5 to 8 percent, and SiO is230-45% of CaO, 40-60% of Al2O3The mass fraction is 10-13%, which basically meets the component requirement of rock wool material preparation.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A method for treating electric furnace ash based on a smelting reduction method is characterized by comprising the following steps:
uniformly mixing the electric furnace ash, the internal reducing agent, the adhesive and water, pelletizing and drying to obtain pellets; smelting the pellets, adding a flux, an externally-prepared reducing agent and a slag former in stages during smelting, and respectively obtaining zinc-containing flue gas, molten iron and furnace slag after smelting.
2. The method as claimed in claim 1, characterized in that the method further comprises the steps of filtering and enriching the zinc-containing flue gas to obtain zinc oxide powder; and granulating the slag to obtain the rock wool.
3. The method of claim 1 or 2, wherein the mass ratio of the electric furnace dust, the internal reducing agent, the adhesive and the water is 100:5-10:1-5: 6-12.
4. The method of claim 1 or 2, wherein the pellet has a radius of 3-5cm and a compressive strength of not less than 150N.
5. The method of claim 1 or 2, wherein the mass ratio of the electric furnace ash, the flux, the externally added reducing agent and the slag former is 100:3-8:2-10: 15-30.
6. The method according to claim 1 or 2, characterized in that the staged addition of flux, external reducing agent and slag former is in particular: adding a fusing agent in the melting period of 1200-1300 ℃, adding an externally-matched reducing agent in the reduction period of 1300-1500 ℃, and adding a slagging agent in the slagging period of more than 1500 ℃.
7. The method of claim 1 or 2, wherein the electric furnace dust has a zinc oxide content of 15 to 30 wt% and an iron oxide content of 20 to 40 wt%; the internal reducing agent is coal powder or coke powder; the adhesive is bentonite or pregelatinized starch; the flux is a calcium-based material or a K, Na-containing light metal material; the externally-prepared reducing agent is coke or coke; the slagging agent is a silicon-based material.
8. The method as claimed in claim 2, characterized in that the zinc-containing flue gas is enriched by bag filtration of a dust collector to obtain zinc oxide powder; and (4) centrifugally granulating the slag to obtain the rock wool.
9. The system for treating the electric furnace dust based on the smelting reduction method is characterized by sequentially comprising a pelletizing system, a smelting system and a molten iron collecting system, wherein the smelting system is connected with a dust removal system and a slag disposal system.
10. The system of claim 9, wherein the pelletizing system is composed of a mixer, a pelletizer, a dryer and a distributor connected in sequence; smelting in the smelting system by using an electric furnace; and a bag-type dust remover is used for removing dust in the dust removing system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110119125.6A CN112941331A (en) | 2021-01-28 | 2021-01-28 | Method and system for treating electric furnace ash based on smelting reduction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110119125.6A CN112941331A (en) | 2021-01-28 | 2021-01-28 | Method and system for treating electric furnace ash based on smelting reduction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112941331A true CN112941331A (en) | 2021-06-11 |
Family
ID=76239539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110119125.6A Pending CN112941331A (en) | 2021-01-28 | 2021-01-28 | Method and system for treating electric furnace ash based on smelting reduction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112941331A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114645141A (en) * | 2022-03-21 | 2022-06-21 | 中冶赛迪技术研究中心有限公司 | Comprehensive recycling and disposal process for zinc and iron-containing smoke dust and slag |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614562A (en) * | 2013-12-06 | 2014-03-05 | 北京科技大学 | Process method for processing solid waste of steelworks by utilizing smelting furnace |
| CN110055410A (en) * | 2019-05-06 | 2019-07-26 | 安徽工业大学 | A kind of electric furnace bag-type dust ash resource utilization method |
-
2021
- 2021-01-28 CN CN202110119125.6A patent/CN112941331A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103614562A (en) * | 2013-12-06 | 2014-03-05 | 北京科技大学 | Process method for processing solid waste of steelworks by utilizing smelting furnace |
| CN110055410A (en) * | 2019-05-06 | 2019-07-26 | 安徽工业大学 | A kind of electric furnace bag-type dust ash resource utilization method |
Non-Patent Citations (1)
| Title |
|---|
| 杨双平等: "《直接还原与熔融还原冶金技术》", 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114645141A (en) * | 2022-03-21 | 2022-06-21 | 中冶赛迪技术研究中心有限公司 | Comprehensive recycling and disposal process for zinc and iron-containing smoke dust and slag |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103173636B (en) | Antimony sulfide concentrate oxygen-enriched melting tank melting method | |
| CN108220610B (en) | A kind of processing method of the dedusting ash containing heavy metal | |
| CN110669942A (en) | Method for treating zinc-containing dust in steel plant | |
| CN114807484B (en) | Method and system for recovering iron and zinc from steel mill ash | |
| CN109306407B (en) | Device and method for treating and utilizing metallurgical zinc-containing dust | |
| CN102965509A (en) | Method and device for treating daub and iron-rich heavy metal solid waste of waste lead-acid storage battery | |
| CN102965510A (en) | Reduction sulfur-fixing bath smelting method and device of low-sulfur lead-containing secondary material and iron-rich heavy metal solid waste | |
| CN101445869A (en) | Method for manufacturing metallic pellets by direct reduction of oxygen-enriched combustion in rotary furnace | |
| Zhu et al. | Multi-process and multi-pollutant control technology for ultra-low emissions in the iron and steel industry | |
| CN110093471A (en) | A kind of efficient low-consume red mud method of comprehensive utilization | |
| CN102399922B (en) | Blast furnace iron making method | |
| CN101532068B (en) | Blast furnace ironmaking production process by cyclically utilizing steel slag and iron slag in metallurgy and chemical industry | |
| CN111996377A (en) | Method for recovering nickel, cobalt and manganese metal from lithium extracted from waste batteries | |
| CN111733330B (en) | Method for enriching and recovering zinc by using rotary kiln | |
| CN110863104B (en) | Method for trapping agglomerate by using platinum group metal-containing waste catalyst iron | |
| CN104651563B (en) | A kind of low lean high phosphorus difficulty selects ferrum/Reduction of manganese ore smelting choosing to combine the method carrying ferrum dephosphorization | |
| CN102344981A (en) | Separation and direct reduction process of iron and boron in boron-containing iron ore concentrate | |
| CN112941331A (en) | Method and system for treating electric furnace ash based on smelting reduction method | |
| CN110512087A (en) | A kind of method of high temperature melting furnace processing steel-making dust-collector | |
| CN112441759A (en) | Method and device for treating waste incineration fly ash with low energy consumption, resource utilization and environmental protection | |
| CN114540617A (en) | Preparation method and application method of redox briquetting of converter fly ash | |
| CN112063848B (en) | Metallurgical furnace for treating copper-containing sludge and treatment method thereof | |
| CN111206158B (en) | Method for recycling blast furnace cloth bag dedusting ash | |
| CN111088437B (en) | Method for treating high-silicon tin ore by using oxygen-enriched top-blown furnace | |
| CN110629054B (en) | Preparation device of manganese-rich slag |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210611 |