CN103436644A - 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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- CN103436644A CN103436644A CN2013103502486A CN201310350248A CN103436644A CN 103436644 A CN103436644 A CN 103436644A CN 2013103502486 A CN2013103502486 A CN 2013103502486A CN 201310350248 A CN201310350248 A CN 201310350248A CN 103436644 A CN103436644 A CN 103436644A
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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 recovery method of Iron And Steel Industry dirt mud, particularly a kind of high efficiente callback Iron And Steel Industry is containing the method for 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.Yet the dirt mud amount produced in Iron And Steel Industry is 1%～1.5% of iron and steel output, contain the element that some are harmful to human health in these dirt mud, if do not processed, not only cause atmospheric pollution, also can cause water to pollute and soil pollution, therefore, adopting the whole bag of tricks to process dirt mud is paid attention to day by day.At present, what the recycling technique of dirt mud was mainly studied is how to the recycling of Fe, and C is not recycled, and is generally directly to be sold at a low price brick field, by brick field, is mixed into baking red bricks in clay and is used.These recoverying and utilizing methods to dirt mud have the following disadvantages: recovery utilization rate is low, and waste is serious.
Summary of the invention
The technical problem to be solved in the present invention is: the method for a kind of high efficiente callback Iron And Steel Industry containing C, Fe dirt mud is provided, in order to realize the high efficiente callback to C, Fe, and can makes the C material that contains reclaimed burn more fully a more thorough.
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, carry out magnetic separation after fragmentation, obtain containing C, Ca, Si powder and containing the Fe material, returning to the steel-making ironworks containing the Fe material utilizes, containing C, Ca, the Si powder is proceeded flotation, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry.
Further technical scheme of the present invention is: the method comprises following concrete steps:
A. screening:
The dirt mud that Steel Plant are contained to C, Fe, Ca, Si and other impurity is through bolting, and the sieve number of vibratory screening apparatus is 10～20 orders, obtains screen underflow and screen overflow, and described screen overflow is directly as the backfill soil utilization;
B. broken:
By screen underflow, through moist ball mill fragmentation, particle size after cracking is 150～250 orders;
C. magnetic separation:
Carry out magnetic separation on magnetic separator, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, the described Fe material that contains returns to the utilization of steel-making ironworks;
D. flotation:
On flotation machine, toward containing in C, Ca, Si powder, add turps flotation agent to carry out flotation, floatingly select high C material, and the deep gouge material except containing C is washed, the solid thing after washing, as the backfill soil utilization, is reclaimed turps in order to return to the recycle of flotation operation to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
Add rosin to carry out the high C material after air-dry cementing, the 1-2% that rosin after being about to melt is high C weight of material by add-on evenly joins in the high C material after air-dry, under normal temperature, through stirrer, stir, the gel that rosin is produced is cemented together by high C material, in order to make high C material produce intensity.
G. compacting:
By the high C material after cementing, through the high pressure briquetting machine, be pressed into spherical or bar-shaped;
H. air-dry:
Natural air drying, make esterified Jiao as reductive agent and fuel for smelting industry.
Further technical scheme of the present invention is: described containing in the dirt mud of C, Fe, Ca, Si and other impurity, C content is gross weight 5～20%, and Fe content is gross weight 20～35%.
Further technical scheme more of the present invention is: described containing in the Fe material, Fe content is for containing 45～70% of Fe weight of material.
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 present invention's high efficiente callback Iron And Steel Industry containing 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 the dirt mud containing C, Fe, Ca, Si and other impurity by Iron And Steel Industry, floatingly selected 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 90 left and right %, 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 the dirt mud containing C, Fe, Ca, Si and other impurity by Iron And Steel Industry, carry out magnetic separation on magnetic separator after screening, fragmentation, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, wherein containing the Fe material, can return to the steel-making ironworks utilizes, should be containing in the Fe material, Fe content is for containing 45～70% of Fe weight of material, and the rate of recovery is about 60% left and right, therefore, the present invention can realize the high efficiente callback to iron.
3. the yield rate of high C material is high, burns more thoroughly more abundant, and thermo-efficiency is higher:
The present invention is the dirt mud containing C, Fe, Ca, Si and other impurity by Iron And Steel Industry, carry out flotation after screening, fragmentation, magnetic separation, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry.Because the present invention has added rosin in cementing process, and rosin has cohesive action, characteristics that heat is high, first, due to its cohesive action, can make high C material be pressed into fully in the pressing process of back spherical or bar-shaped, thereby greatly improve yield rate and the ventilation property of high C material; The second, because the rosin heat is high, can make the burning of high C material more thorough, more abundant, thermo-efficiency is higher.
The present invention can realize in Iron And Steel Industry dirt mud containing the high efficiente callback of C, Fe material, removed harmful impurity, avoided contaminate environment, make economy obtain cycle development, solved 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, to the present invention's high efficiente callback Iron And Steel Industry, the technical characterictic containing the method for C, Fe dirt mud is further described.
The accompanying drawing explanation
Fig. 1: the present invention's high efficiente callback Iron And Steel Industry is containing the process flow sheet of the method for C, Fe dirt mud.
Embodiment
Embodiment mono-:
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, carry out magnetic separation after fragmentation, obtain containing C, Ca, Si powder and containing the Fe material, returning to the steel-making ironworks containing the Fe material utilizes, containing C, Ca, the Si powder is proceeded flotation, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry, the method comprises following concrete steps:
A. screening:
By Steel Plant containing the dirt mud of C, Fe, Ca, Si and other impurity through bolting, containing in the dirt mud of C, Fe, Ca, Si and other impurity, C content is 5% of dirt mud gross weight described, Fe content 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 is directly as the backfill soil utilization;
B. broken:
By screen underflow, through moist ball mill fragmentation, particle size after cracking is 150 orders;
C. magnetic separation:
Carry out magnetic separation on magnetic separator, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, described containing in the Fe material, Fe content is containing 45% of Fe weight of material, should contain the Fe material and return to the utilization of steel-making ironworks;
D. flotation:
Toward containing in C, Ca, Si powder, adding turps flotation agent to carry out flotation, floatingly select high C material on flotation machine, in this high C material, C content is 70% of high C weight of material; And the deep gouge material except containing C is washed, the solid thing after washing, as the backfill soil utilization, is reclaimed turps in order to return to the recycle of flotation operation to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
Add rosin to carry out the high C material after air-dry cementing, rosin after being about to melt is that 1% of high C weight of material evenly joins in the high C material after air-dry by add-on, under normal temperature, through stirrer, stir, the gel that rosin is produced is cemented together by high C material, in order to make high C material produce intensity.
G. compacting:
By the high C material after cementing, through the high pressure briquetting machine, be pressed into spherical;
H. air-dry:
Natural air drying, make esterified Jiao as reductive agent and fuel for smelting industry.
Embodiment bis-:
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, carry out magnetic separation after fragmentation, obtain containing C, Ca, Si powder and containing the Fe material, returning to the steel-making ironworks containing the Fe material utilizes, containing C, Ca, the Si powder is proceeded flotation, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry, the method comprises following concrete steps:
A. screening:
By Steel Plant containing the dirt mud of C, Fe, Ca, Si and other impurity through bolting, containing in the dirt mud of C, Fe, Ca, Si and other impurity, C content is 10% of dirt mud gross weight described, Fe content 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 is directly as the backfill soil utilization;
B. broken:
By screen underflow, through moist ball mill fragmentation, particle size after cracking is 200 orders;
C. magnetic separation:
Carry out magnetic separation on magnetic separator, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, described containing in the Fe material, Fe content is containing 55% of Fe weight of material, should contain the Fe material and return to the utilization of steel-making ironworks;
D. flotation:
Toward containing in C, Ca, Si powder, adding turps flotation agent to carry out flotation, floatingly select high C material on flotation machine, in this high C material, C content is 80% of high C weight of material; And the deep gouge material except containing C is washed, the solid thing after washing, as the backfill soil utilization, is reclaimed turps in order to return to the recycle of flotation operation to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
Add rosin to carry out the high C material after air-dry cementing, rosin after being about to melt is that 1.5% of high C weight of material evenly joins in the high C material after air-dry by add-on, through stirrer, stir, the gel that rosin produces, high C material is cemented together, make high C material produce intensity.
G. compacting:
By the high C material after cementing, through the high pressure briquetting machine, be pressed into bar-shaped;
H. air-dry:
Natural air drying, make esterified Jiao as reductive agent and fuel for smelting industry.
Embodiment tri-:
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, carry out magnetic separation after fragmentation, obtain containing C, Ca, Si powder and containing the Fe material, returning to the steel-making ironworks containing the Fe material utilizes, containing C, Ca, the Si powder is proceeded flotation, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry, the method comprises following concrete steps:
A. screening:
By Steel Plant containing the dirt mud of C, Fe, Ca, Si and other impurity through bolting, containing in the dirt mud of C, Fe, Ca, Si and other impurity, C content is 15% of dirt mud gross weight described, Fe content 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 is directly as the backfill soil utilization;
B. broken:
By screen underflow, through moist ball mill fragmentation, particle size after cracking is 220 orders;
C. magnetic separation:
Carry out magnetic separation on magnetic separator, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, described containing in the Fe material, Fe content is containing 65% of Fe weight of material, should contain the Fe material and return to the utilization of steel-making ironworks;
D. flotation:
Toward containing in C, Ca, Si powder, adding turps flotation agent to carry out flotation, floatingly select high C material on flotation machine, in this high C material, C content is 85% of high C weight of material; And the deep gouge material except containing C is washed, the solid thing after washing, as the backfill soil utilization, is reclaimed turps in order to return to the recycle of flotation operation to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
Add rosin to carry out the high C material after air-dry cementing, rosin after being about to melt is that 1.5% of high C weight of material evenly joins in the high C material after air-dry by add-on, through stirrer, stir, the gel that rosin produces, high C material is cemented together, make high C material produce intensity.
G. compacting:
By the high C material after cementing, through the high pressure briquetting machine, be pressed into spherical;
H. air-dry:
Natural air drying, make esterified Jiao as reductive agent and fuel for smelting industry.
Embodiment tetra-:
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, carry out magnetic separation after fragmentation, obtain containing C, Ca, Si powder and containing the Fe material, returning to the steel-making ironworks containing the Fe material utilizes, containing C, Ca, the Si powder is proceeded flotation, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry, the method comprises following concrete steps:
A. screening:
By Steel Plant containing the dirt mud of C, Fe, Ca, Si and other impurity through bolting, containing in the dirt mud of C, Fe, Ca, Si and other impurity, C content is 20% of dirt mud gross weight described, Fe content 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 is directly as the backfill soil utilization;
B. broken:
By screen underflow, through moist ball mill fragmentation, particle size after cracking is 250 orders;
C. magnetic separation:
Carry out magnetic separation on magnetic separator, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, described containing in the Fe material, Fe content is containing 70% of Fe weight of material, should contain the Fe material and return to the utilization of steel-making ironworks;
D. flotation:
Toward containing in C, Ca, Si powder, adding turps flotation agent to carry out flotation, floatingly select high C material on flotation machine, in this high C material, C content is 90% of high C weight of material; And the deep gouge material except containing C is washed, the solid thing after washing, as the backfill soil utilization, is reclaimed turps in order to return to the recycle of flotation operation to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
Add rosin to carry out the high C material after air-dry cementing, rosin after being about to melt is that 2% of high C weight of material evenly joins in the high C material after air-dry by add-on, through stirrer, stirs, and the gel that rosin produces, high C material is cemented together, make high C material produce intensity.
G. compacting:
By the high C material after cementing, through the high pressure briquetting machine, be pressed into bar-shaped;
H. air-dry:
Natural air drying, make esterified Jiao as reductive agent and fuel for smelting industry.
Claims (7)
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 the dirt mud containing C, Fe, Ca, Si and other impurity by Iron And Steel Industry, carry out magnetic separation after screening, fragmentation, obtain containing C, Ca, Si powder and contain the Fe material, returning to the steel-making ironworks containing the Fe material utilizes, proceed flotation containing C, Ca, Si powder, floatingly select high C material, high C material is after air-dry, add rosin to carry out cementing, then repressed glomeration or bar-shaped, can make esterified Jiao as reductive agent and fuel for smelting industry after air-dry.
2. 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: the method comprises following concrete steps:
A. screening:
The dirt mud that Steel Plant are contained to C, Fe, Ca, Si and other impurity is through bolting, and the sieve number of vibratory screening apparatus is 10～20 orders, obtains screen underflow and screen overflow, and described screen overflow is directly as the backfill soil utilization;
B. broken:
By screen underflow, through moist ball mill fragmentation, particle size after cracking is 150～250 orders;
C. magnetic separation:
Carry out magnetic separation on magnetic separator, obtain containing C, Ca, Si powder after magnetic separation and contain the Fe material, the described Fe material that contains returns to the utilization of steel-making ironworks;
D. flotation:
On flotation machine, toward containing in C, Ca, Si powder, add turps flotation agent to carry out flotation, floatingly select high C material, and the deep gouge material except containing C is washed, the solid thing after washing, as the backfill soil utilization, is reclaimed turps in order to return to the recycle of flotation operation to washing lotion;
E. air-dry:
By the high C material that floatingly selects through natural air drying;
F. cementing:
Add rosin to carry out the high C material after air-dry cementing, rosin after being about to melt is that 1～2% of high C weight of material evenly joins in the high C material after air-dry by add-on, under normal temperature, through stirrer, stir, the gel that rosin is produced is cemented together by high C material, in order to make high C material produce intensity;
G. compacting:
By the high C material after cementing, through the high pressure briquetting machine, be pressed into spherical or bar-shaped;
H. air-dry:
Natural air drying, make esterified Jiao as reductive agent and fuel for smelting industry.
3. high efficiente callback Iron And Steel Industry according to claim 1 and 2, containing the method for C, Fe dirt mud, is characterized in that: described containing in the dirt mud of C, Fe, Ca, Si and other impurity, C content is gross weight 5～20%, and Fe content is gross weight 20～35%.
4. high efficiente callback Iron And Steel Industry according to claim 1 and 2, containing the method for C, Fe dirt mud, is characterized in that: described containing in the Fe material, Fe content is for containing 45～70% of Fe weight of material.
5. high efficiente callback Iron And Steel Industry according to claim 1 and 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.
7. high efficiente callback Iron And Steel Industry according to claim 4 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104907171A (en) * | 2015-06-09 | 2015-09-16 | 安徽工业大学 | Method for recycling crystalline flake graphite from molten iron desulphurization residues |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104907171A (en) * | 2015-06-09 | 2015-09-16 | 安徽工业大学 | Method for recycling crystalline flake graphite from molten iron desulphurization residues |
| 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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| CN103436644B (en) | 2015-04-08 |
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