CN103436644B - Method for efficiently recovering dust sludge containing C and Fe in iron and steel industry - Google Patents
Method for efficiently recovering dust sludge containing C and Fe in iron and steel industry Download PDFInfo
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- CN103436644B CN103436644B CN201310350248.6A CN201310350248A CN103436644B CN 103436644 B CN103436644 B CN 103436644B CN 201310350248 A CN201310350248 A CN 201310350248A CN 103436644 B CN103436644 B CN 103436644B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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Abstract
The invention provides a method for efficiently recovering dust sludge containing C and Fe in the iron and steel industry and relates to a dust sludge recovering method in the iron and steel industry. According to the method, the dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel industry is screened, crushed, magnetically separated and then selected in a flotation manner to get a high-C-content material, the high-C-content material is added with rosin for lipidation and cementation after being air-dried, then is compressed into the ball or rod shape, and is air-dried to get lipidation coke used as a reducer and fuel in the smelting industry. The method can efficiently recover C and Fe, the yield of the C-containing material is high, the burning is more thorough and sufficient, the heat efficiency is higher, and the method facilitates popularization and application.
Description
Technical field
The present invention relates to a kind of a kind of recovery method of Iron And Steel Industry dirt mud, the particularly high efficiente callback Iron And Steel Industry method containing C, Fe dirt mud.
Background technology
In recent years, China's Iron And Steel Industry is developed rapidly, and according to statistics, within 2009, China's crude steel output reaches 5.7 hundred million tons, accounts for nearly 47% of global ultimate production.But the dirt mud amount produced in Iron And Steel Industry is 1% ~ 1.5% of iron and steel output, be harmful to the element of human health containing some in these dirt mud, if do not processed, then not only cause atmospheric pollution, also can cause water pollutions and soil pollution, therefore, various method process dirt mud is adopted day by day to be paid attention to.At present, what mainly study the recycling technique of dirt mud is recycling how to Fe, and does not recycle C, be generally directly with sale at low prices to brick field, mix baking red bricks in clay by brick field and use.These have the following disadvantages the recoverying and utilizing method of dirt mud: recovery utilization rate is low, and waste is serious.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of high efficiente callback Iron And Steel Industry containing the method for C, Fe dirt mud, to realize the high efficiente callback to C, Fe, and can make burning more fully a more thorough containing C material of recovery.
The technical scheme solved the problems of the technologies described above is: a kind of high efficiente callback Iron And Steel Industry is containing C, the method of Fe dirt mud, the method is containing C by Iron And Steel Industry, Fe, Ca, the dirt mud of Si and other impurity, through screening, magnetic separation is carried out after fragmentation, obtain containing C, Ca, Si powder and containing Fe material, return to steel-making ironworks containing Fe material to utilize, containing C, Ca, Si powder proceeds flotation, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain after air-dry for the esterified Jiao of smelting industry as reductive agent and fuel.
Further technical scheme of the present invention is: the method comprises following concrete steps:
A. sieve:
Steel Plant are contained the dirt mud of C, Fe, Ca, Si and other impurity through bolting, the sieve number of vibratory screening apparatus is 10 ~ 20 orders, obtains screen underflow and screen overflow, and described screen overflow directly utilizes as backfill soil;
B. broken:
Screen underflow is broken through moist ball mill, and particle size after cracking is 150 ~ 250 orders;
C. magnetic separation:
Magnetic separator carries out magnetic separation, obtains containing C, Ca, Si powder and containing Fe material after magnetic separation, described returns the utilization of steel-making ironworks containing Fe material;
D. flotation:
Flotation machine carries out flotation toward containing adding turps flotation agent in C, Ca, Si powder, floatingly select high C material, and wash except containing the deep gouge material except C, the solid thing after washing utilizes as backfill soil, carries out recovery turps to return flotation circuit recycle to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
High C material after air-dry is added rosin to carry out cementing, the rosin be about to after fusing evenly joins in the high C material after air-dry by the 1-2% that add-on is high C weight of material, stir through stirrer under normal temperature, the gel that rosin is produced by cemented together for high C material so that make high C material produce intensity.
G. suppress:
High C material after cementing is pressed into spherical or bar-shaped through high pressure briquetting machine;
H. air-dry:
Natural air drying, obtains for the esterified Jiao of smelting industry as reductive agent and fuel.
Further technical scheme of the present invention is: described contains in the dirt mud of C, Fe, Ca, Si and other impurity, and C content is 5 ~ 20%, Fe content of gross weight is 20 ~ 35% of gross weight.
Further technical scheme more of the present invention is: described contains in Fe material, and Fe content is containing Fe weight of material 45 ~ 70%.
Further technical scheme more of the present invention is: in described high C material, C content is 70 ~ 90% of high C weight of material.
Owing to adopting said structure, the high efficiente callback Iron And Steel Industry of the present invention contains the method for C, Fe dirt mud compared with prior art, has following beneficial effect:
1. can realize the high efficiente callback to C:
Because the present invention is dirt mud Iron And Steel Industry being contained C, Fe, Ca, Si and other impurity, carry out floatingly selecting high C material after screening, fragmentation, magnetic separation, in this high C material, C content is 70 ~ 90% of its gross weight, its comprehensive recovery is about about 90 %, therefore, the present invention can realize the high efficiente callback to C.
2. can realize the high efficiente callback to iron:
The present invention is dirt mud Iron And Steel Industry being contained C, Fe, Ca, Si and other impurity, on magnetic separator, magnetic separation is carried out after screening, fragmentation, obtain containing C, Ca, Si powder and containing Fe material after magnetic separation, wherein can return to steel-making ironworks containing Fe material to utilize, should containing in Fe material, Fe content is containing Fe weight of material 45 ~ 70%, and the rate of recovery is about about 60%, therefore, the present invention can realize the high efficiente callback to iron.
3. the yield rate of high C material is high, and burning is more thoroughly more abundant, and thermo-efficiency is higher:
The present invention is dirt mud Iron And Steel Industry being contained C, Fe, Ca, Si and other impurity, flotation is carried out after screening, fragmentation, magnetic separation, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain after air-dry for esterified Jiao of smelting industry as reductive agent and fuel.Because the present invention adds rosin in bonding process, and rosin has cohesive action, feature that heat is high, first, due to its cohesive action, can make to be pressed into fully in the pressing process of high C material below spherical or bar-shaped, thus substantially increase yield rate and the ventilation property of high C material; The second, because rosin heat is high, the burning of high C material can be made more thorough, and more fully, thermo-efficiency is higher.
4. the present invention can realize, to the high efficiente callback containing C, Fe material in Iron And Steel Industry dirt mud, eliminating harmful impurity, avoiding contaminate environment, make economy obtain cycle development, solve the resource problem of Iron and Steel Production, make the development of Iron And Steel Industry go on the road of health.
5. method is easy, is easy to apply; Economic benefit, social benefit are considerable; Without environmental protection pressure, waste water, waste gas can reach zero release.
Below, in conjunction with Figure of description and embodiment, the technical characteristic of the high efficiente callback Iron And Steel Industry of the present invention containing the method for C, Fe dirt mud is further described.
Accompanying drawing explanation
Fig. 1: the high efficiente callback Iron And Steel Industry of the present invention contains the process flow sheet of the method for C, Fe dirt mud.
Embodiment
Embodiment one:
A kind of high efficiente callback Iron And Steel Industry is containing C, the method of Fe dirt mud, the method is containing C by Iron And Steel Industry, Fe, Ca, the dirt mud of Si and other impurity, through screening, magnetic separation is carried out after fragmentation, obtain containing C, Ca, Si powder and containing Fe material, return to steel-making ironworks containing Fe material to utilize, containing C, Ca, Si powder proceeds flotation, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain for the esterified Jiao of smelting industry as reductive agent and fuel after air-dry, the method comprises following concrete steps:
A. sieve:
Steel Plant are contained the dirt mud of C, Fe, Ca, Si and other impurity through bolting, contain in the dirt mud of C, Fe, Ca, Si and other impurity described, C content is 5%, Fe content of dirt mud gross weight is 20% of dirt mud gross weight; The sieve number of described vibratory screening apparatus is 10 orders, obtains screen underflow and screen overflow, and described screen overflow directly utilizes as backfill soil;
B. broken:
Screen underflow is broken through moist ball mill, and particle size after cracking is 150 orders;
C. magnetic separation:
Magnetic separator carries out magnetic separation, obtains containing C, Ca, Si powder and containing Fe material after magnetic separation, described contains in Fe material, and Fe content is containing Fe weight of material 45%, should return the utilization of steel-making ironworks containing Fe material;
D. flotation:
Flotation machine carries out flotation toward containing adding turps flotation agent in C, Ca, Si powder, and floatingly select high C material, in this high C material, C content is 70% of high C weight of material; And wash except containing the deep gouge material except C, the solid thing after washing utilizes as backfill soil, carries out recovery turps to return flotation circuit recycle to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
High C material after air-dry is added rosin to carry out cementing, the rosin be about to after fusing is that 1% of high C weight of material evenly joins in the high C material after air-dry by add-on, stir through stirrer under normal temperature, the gel that rosin is produced by cemented together for high C material so that make high C material produce intensity.
G. suppress:
High C material after cementing is pressed into spherical through high pressure briquetting machine;
H. air-dry:
Natural air drying, obtains for the esterified Jiao of smelting industry as reductive agent and fuel.
Embodiment two:
A kind of high efficiente callback Iron And Steel Industry is containing C, the method of Fe dirt mud, the method is containing C by Iron And Steel Industry, Fe, Ca, the dirt mud of Si and other impurity, through screening, magnetic separation is carried out after fragmentation, obtain containing C, Ca, Si powder and containing Fe material, return to steel-making ironworks containing Fe material to utilize, containing C, Ca, Si powder proceeds flotation, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain for the esterified Jiao of smelting industry as reductive agent and fuel after air-dry, the method comprises following concrete steps:
A. sieve:
Steel Plant are contained the dirt mud of C, Fe, Ca, Si and other impurity through bolting, contain in the dirt mud of C, Fe, Ca, Si and other impurity described, C content is 10%, Fe content of dirt mud gross weight is 25% of dirt mud gross weight; The sieve number of described vibratory screening apparatus is 15 orders, obtains screen underflow and screen overflow, and described screen overflow directly utilizes as backfill soil;
B. broken:
Screen underflow is broken through moist ball mill, and particle size after cracking is 200 orders;
C. magnetic separation:
Magnetic separator carries out magnetic separation, obtains containing C, Ca, Si powder and containing Fe material after magnetic separation, described contains in Fe material, and Fe content is containing Fe weight of material 55%, should return the utilization of steel-making ironworks containing Fe material;
D. flotation:
Flotation machine carries out flotation toward containing adding turps flotation agent in C, Ca, Si powder, and floatingly select high C material, in this high C material, C content is 80% of high C weight of material; And wash except containing the deep gouge material except C, the solid thing after washing utilizes as backfill soil, carries out recovery turps to return flotation circuit recycle to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
High C material after air-dry is added rosin to carry out cementing, the rosin be about to after fusing is that 1.5% of high C weight of material evenly joins in the high C material after air-dry by add-on, stir through stirrer, the gel that rosin produces, by cemented together for high C material, high C material is made to produce intensity.
G. suppress:
High C material after cementing is pressed into bar-shaped through high pressure briquetting machine;
H. air-dry:
Natural air drying, obtains for the esterified Jiao of smelting industry as reductive agent and fuel.
Embodiment three:
A kind of high efficiente callback Iron And Steel Industry is containing C, the method of Fe dirt mud, the method is containing C by Iron And Steel Industry, Fe, Ca, the dirt mud of Si and other impurity, through screening, magnetic separation is carried out after fragmentation, obtain containing C, Ca, Si powder and containing Fe material, return to steel-making ironworks containing Fe material to utilize, containing C, Ca, Si powder proceeds flotation, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain for the esterified Jiao of smelting industry as reductive agent and fuel after air-dry, the method comprises following concrete steps:
A. sieve:
Steel Plant are contained the dirt mud of C, Fe, Ca, Si and other impurity through bolting, contain in the dirt mud of C, Fe, Ca, Si and other impurity described, C content is 15%, Fe content of dirt mud gross weight is 30% of dirt mud gross weight; The sieve number of described vibratory screening apparatus is 18 orders, obtains screen underflow and screen overflow, and described screen overflow directly utilizes as backfill soil;
B. broken:
Screen underflow is broken through moist ball mill, and particle size after cracking is 220 orders;
C. magnetic separation:
Magnetic separator carries out magnetic separation, obtains containing C, Ca, Si powder and containing Fe material after magnetic separation, described contains in Fe material, and Fe content is containing Fe weight of material 65%, should return the utilization of steel-making ironworks containing Fe material;
D. flotation:
Flotation machine carries out flotation toward containing adding turps flotation agent in C, Ca, Si powder, and floatingly select high C material, in this high C material, C content is 85% of high C weight of material; And wash except containing the deep gouge material except C, the solid thing after washing utilizes as backfill soil, carries out recovery turps to return flotation circuit recycle to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
High C material after air-dry is added rosin to carry out cementing, the rosin be about to after fusing is that 1.5% of high C weight of material evenly joins in the high C material after air-dry by add-on, stir through stirrer, the gel that rosin produces, by cemented together for high C material, high C material is made to produce intensity.
G. suppress:
High C material after cementing is pressed into spherical through high pressure briquetting machine;
H. air-dry:
Natural air drying, obtains for the esterified Jiao of smelting industry as reductive agent and fuel.
Embodiment four:
A kind of high efficiente callback Iron And Steel Industry is containing C, the method of Fe dirt mud, the method is containing C by Iron And Steel Industry, Fe, Ca, the dirt mud of Si and other impurity, through screening, magnetic separation is carried out after fragmentation, obtain containing C, Ca, Si powder and containing Fe material, return to steel-making ironworks containing Fe material to utilize, containing C, Ca, Si powder proceeds flotation, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain for the esterified Jiao of smelting industry as reductive agent and fuel after air-dry, the method comprises following concrete steps:
A. sieve:
Steel Plant are contained the dirt mud of C, Fe, Ca, Si and other impurity through bolting, contain in the dirt mud of C, Fe, Ca, Si and other impurity described, C content is 20%, Fe content of dirt mud gross weight is 35% of dirt mud gross weight; The sieve number of described vibratory screening apparatus is 20 orders, obtains screen underflow and screen overflow, and described screen overflow directly utilizes as backfill soil;
B. broken:
Screen underflow is broken through moist ball mill, and particle size after cracking is 250 orders;
C. magnetic separation:
Magnetic separator carries out magnetic separation, obtains containing C, Ca, Si powder and containing Fe material after magnetic separation, described contains in Fe material, and Fe content is containing Fe weight of material 70%, should return the utilization of steel-making ironworks containing Fe material;
D. flotation:
Flotation machine carries out flotation toward containing adding turps flotation agent in C, Ca, Si powder, and floatingly select high C material, in this high C material, C content is 90% of high C weight of material; And wash except containing the deep gouge material except C, the solid thing after washing utilizes as backfill soil, carries out recovery turps to return flotation circuit recycle to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
High C material after air-dry is added rosin to carry out cementing, the rosin be about to after fusing is that 2% of high C weight of material evenly joins in the high C material after air-dry by add-on, stirs through stirrer, the gel that rosin produces, by cemented together for high C material, high C material is made to produce intensity.
G. suppress:
High C material after cementing is pressed into bar-shaped through high pressure briquetting machine;
H. air-dry:
Natural air drying, obtains for the esterified Jiao of smelting industry as reductive agent and fuel.
Claims (6)
1. a high efficiente callback Iron And Steel Industry is containing the method for C, Fe dirt mud, it is characterized in that: the method is dirt mud Iron And Steel Industry being contained C, Fe, Ca, Si and other impurity, magnetic separation is carried out after screening, fragmentation, obtain containing C, Ca, Si powder and containing Fe material, return to steel-making ironworks containing Fe material to utilize, flotation is proceeded containing C, Ca, Si powder, floatingly select high C material, high C material is after air-dry, adding rosin carries out cementing, then repressed glomeration or bar-shaped, can obtain for esterified Jiao of smelting industry as reductive agent and fuel after air-dry;
The method comprises following concrete steps:
A. sieve:
Steel Plant are contained the dirt mud of C, Fe, Ca, Si and other impurity through bolting, the sieve number of vibratory screening apparatus is 10 ~ 20 orders, obtains screen underflow and screen overflow, and described screen overflow directly utilizes as backfill soil;
B. broken:
Screen underflow is broken through moist ball mill, and particle size after cracking is 150 ~ 250 orders;
C. magnetic separation:
Magnetic separator carries out magnetic separation, obtains containing C, Ca, Si powder and containing Fe material after magnetic separation, described returns the utilization of steel-making ironworks containing Fe material;
D. flotation:
Flotation machine carries out flotation toward containing adding turps flotation agent in C, Ca, Si powder, floatingly select high C material, and wash except containing the deep gouge material except C, the solid thing after washing utilizes as backfill soil, carries out recovery turps to return flotation circuit recycle to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
High C material after air-dry is added rosin to carry out cementing, the rosin be about to after fusing is that 1 ~ 2% of high C weight of material evenly joins in the high C material after air-dry by add-on, stir through stirrer under normal temperature, the gel that rosin is produced by cemented together for high C material so that make high C material produce intensity;
G. suppress:
High C material after cementing is pressed into spherical or bar-shaped through high pressure briquetting machine;
H. air-dry:
Natural air drying, obtains for the esterified Jiao of smelting industry as reductive agent and fuel.
2. high efficiente callback Iron And Steel Industry according to claim 1 is containing the method for C, Fe dirt mud, it is characterized in that: described contains in the dirt mud of C, Fe, Ca, Si and other impurity, and C content is 5 ~ 20%, Fe content of gross weight is 20 ~ 35% of gross weight.
3. high efficiente callback Iron And Steel Industry according to claim 1 is containing the method for C, Fe dirt mud, it is characterized in that: described contains in Fe material, and Fe content is containing Fe weight of material 45 ~ 70%.
4. high efficiente callback Iron And Steel Industry according to claim 1 is containing the method for C, Fe dirt mud, and it is characterized in that: in described high C material, C content is 70 ~ 90% of high C weight of material.
5. high efficiente callback Iron And Steel Industry according to claim 2 is containing the method for C, Fe dirt mud, and it is characterized in that: in described high C material, C content is 70 ~ 90% of high C weight of material.
6. high efficiente callback Iron And Steel Industry according to claim 3 is containing the method for C, Fe dirt mud, and it is characterized in that: in described high C material, C content is 70 ~ 90% of high C weight of material.
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| CN104907171B (en) * | 2015-06-09 | 2017-01-25 | 安徽工业大学 | Method for recycling crystalline flake graphite from molten iron desulphurization residues |
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| CN102319617A (en) * | 2011-08-15 | 2012-01-18 | 鞍钢集团矿业公司 | Process for recovering iron and carbon elements from blast furnace gas ash |
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