CN104141019A - Modification method of iron-containing slag and special equipment for modification method - Google Patents
Modification method of iron-containing slag and special equipment for modification method Download PDFInfo
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- CN104141019A CN104141019A CN201410305578.8A CN201410305578A CN104141019A CN 104141019 A CN104141019 A CN 104141019A CN 201410305578 A CN201410305578 A CN 201410305578A CN 104141019 A CN104141019 A CN 104141019A
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- slag
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- coal dust
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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
Abstract
The invention discloses a modification method of iron-containing slag and special equipment for the modification method. The method sequentially comprises the following steps: (1) spraying a mixture of a modifier and pulverized coal into a furnace hearth of a modification furnace so as to melt the modifier, and feeding the modifier in a high-temperature liquid state into the molten iron-containing slag; (2) adding a reducing agent into the slag and carrying out reduction on the slag so as to extract iron; (3) further spraying and blowing the mixture of the modifier and the pulverized coal into the furnace hearth of the modification furnace after the extraction of the iron and smelting the slag again. During the two modification processes, the mixture of the modifier and the pulverized coal is sprayed into the furnace hearth by virtue of two symmetric coal-fired vortex nozzles along a tangential direction of the furnace wall of the modification furnace, so that the modifier is molten in a heating manner and can be easily and evenly mixed with the molten slag; the modified slag can be directly used for preparing a high added-value product, so that the defects of the existing slag treatment and utilization mode which is simple, coarse, high in energy consumption and the like are avoided. The modification method disclosed by the invention has the characteristics of diversification of utilization mode, high utilization rate, good economic benefit, less environmental pollution and the like.
Description
Technical field
The present invention relates to the method for utilizing of metallurgical cinder, relate in particular to the method for modifying of the iron content slag producing in the smelting process of metal and the specific equipment of realizing the method, belong to the upgrading field of iron content slag.
Background technology
In the smelting process of current black and non-ferrous metal, produced a large amount of high-temperature molten-state slags, these slags are that the institutes such as gangue that are mingled with in smelting the slag former that need to deliberately add or ore form, and its main component is SiO
2, CaO, MgO, Al
2o
3, FeO, Fe
2o
3deng oxide compound, because the fusing point of these oxide compounds and the complex compound that forms thereof is all higher, the temperature of the slag of therefore discharging in metallurgical process is generally all higher than 1500 ℃, and to the processing and utilizing of these slags, be all almost for cold conditions slag at present, and the mode of utilizing is also fairly simple, extensive, a part is produced cement, non-burning brick, the material of construction such as aggregate of paving the way, a part turns back to again in smelting procedure after simple process, also have greatly owing to cannot processed utilization being landfilled, heap is abandoned, therefore exist utilization ratio lower, deficiency in economic performance, environmental pollution seriously waits series of problems.
Simultaneously because the temperature of slag is higher and its hot melt is large thereby it has contained huge heat energy, although the recycling of slag heat has been carried out to a large amount of research both at home and abroad, but also mainly concentrate on by physics heat exchange or the single way of recycling of chemical energy transform mode, nearly all because equipment is complicated, operation cost is high, heat energy recovery rate and economic benefit is low etc. that problem causes realizing large-scale industrialization.
In a word, be there is to following problem in the utilization of slag at present:
(1) to the utilization of slag, be all to utilize separately for " slag " and " heat ", finally cause that utilization ratio is low, deficiency in economic performance etc.
(2) to slag utilize process in because the composition of slag is difficult to satisfy the demand, a part can be by modified utilization under cold conditions, therefore need to carry out broken abrasive dust to slag, special in the larger slag of hardness, this technological process efficiency is very low, energy consumption is higher, and the added value of product of preparing is generally all lower.And the slag of the overwhelming majority due to the composition demand difference of its composition and target material greatly or under cold conditions, cannot realize and modifiedly cause it to go out of use.
(3) heat of slag is almost all wasted, even if adopt current a certain technique to reclaim certain heat energy, but also needs to pay very high cost.And sometimes in order to utilize slag also to need cold slag to reheat fusing, improved greatly and utilized cost.
In order effectively to utilize slag, need to carry out upgrading to slag; Which kind of at present, to mainly facing following problem in molten state slag upgrading process, have much room for improvement: the 1. type of heating of melting materials capable: because modification agent is cold burden thereby needs heating to be melted in upgrading process, thereby select type of heating extremely important.2. modification agent add mode: because the viscosity of molten state slag is larger, and the decline meeting of viscosity with temperature increases rapidly, if therefore directly cold burden is joined in molten state slag and will make slag solidify rapidly, then melted very difficult, cost is very high.3. the blending manner of molten state slag and modification agent: if molten state slag directly mixes with solid-state modification agent, be difficult to reach evenly, and modification agent can be covered in slag surface, make slag crust.
Summary of the invention
Technical problem to be solved by this invention is to overcome the deficiencies in the prior art, and the method for modifying of a kind of iron content slag that a kind of processing cost is low, slag utilizes wide ranges is provided.
First the present invention provides a kind of method for modifying of iron content slag, and the method comprises successively upgrading, carries iron, secondary upgrading; Wherein, a described upgrading comprises: the cold slag of iron content is melted in upgrading stove and obtain molten state iron content slag; The mixture of modification agent and coal dust is sprayed in the burner hearth of upgrading stove, utilize coal dust firing liberated heat to make modification agent fusing enter into iron content slag with the form of high-temperature liquid state;
The described iron of carrying comprises: the furnace bottom of upgrading stove and furnace bosh are separated, reductive agent is joined in slag, in the burner hearth of upgrading stove, spray into pure coal dust firing heat release, the temperature of iron is put forward in the interior reduction of burner hearth that maintains upgrading stove;
Described secondary upgrading comprises: carry iron and finish rear continuation to the mixture of jet in the burner hearth of upgrading stove modification agent and coal dust, slag is smelted again.
Wherein, described iron content slag is preferably molten steel slag.
Described modification agent is preferably flyash.At upgrading for the first time and for the second time in upgrading, the volume ratio of modification agent flyash and coal dust is preferably 1:1.
Be preferably coal dust carrying the reductive agent described in iron step.
The present invention has adopted the mode of combusting coal fines to carry out heat fused to modification agent, main consideration coal dust is a kind of fuel of less expensive, temperature of combustion is high and technology is relatively ripe, use for reference the slag tap technology in fuel-burning power plant simultaneously, winding-up simultaneously after modification agent is mixed with coal dust, can utilize very efficiently the heat of coal dust firing like this, modification agent is melt into liquid state, liquid modification agent is very easy to mix with molten state slag, liquid modification agent carries a large amount of heats simultaneously, can carry out concurrent heating to molten state slag.In order to improve the heat utilization ratio of coal powder injection burning, the present invention, at upgrading and for the second time in upgrading process, sprays into the mixture of modification agent and coal dust in burner hearth along upgrading stove furnace wall tangential direction by two coal-fired swirl nozzles of symmetry; When coal dust is during at stove chamber inner combustion, its combustion flame will become eddy flow and along furnace wall rising, can extend the residence time of high-temperature gas in stove at freeze profile, and then strengthen the heat utilization rate of coal dust firing.
Another object of the present invention is to provide a kind of specific equipment of realizing described upgrading metering method.
Another object of the present invention is achieved through the following technical solutions:
A specific equipment of realizing described upgrading metering method, comprising: upgrading furnace body and blowing device; Described upgrading furnace body comprises furnace bottom, furnace bosh, furnace roof three parts; Furnace bottom both sides symmetric design two gudgeons, by gudgeon by furnace bottom stand on chassis; Furnace roof leaves a flue in one side, leaves at an upper portion thereof a vision slit, in flue bottom design one circulating water smoke test pipe; Wherein, at the bottom of furnace bosh, slightly higher position place is two symmetrical coal-fired swirl nozzles, two coal-fired swirl nozzle symmetries along furnace wall tangential direction, enter burner hearth, coal-fired eddy flow spray is connected with blowing device; When coal dust is during at stove chamber inner combustion, its combustion flame will become eddy flow and along furnace wall rising, can extend the residence time of high-temperature gas in stove at freeze profile, and then strengthen the heat utilization rate of coal dust firing.
Wherein, between furnace bosh and furnace bottom, preferably adopt flange to be connected, facilitate furnace bosh and furnace bottom to separate, to reductive agent is joined in slag slag is reduced.
It is 2 times of furnace bottom height for furnace waist height, and relatively long furnace bosh is conducive to extend the residence time of high-temperature flue gas in stove; Furnace roof height is less, is 1/2 of furnace bottom substantially.
Described coal dust and modification agent blowing device be by gas feed, jet gun, and pan feeding flowrate control valve, feed bin, spraying gun, material, gas mixture outlet, bin blanking mouth, jet gun nozzle form; Wherein jet gun is positioned at the inside of spraying gun, and the place ahead of jet gun nozzle is material, gas mixture outlet, and feed bin is connected by feed opening with spraying gun; Feed opening is positioned at the back upper place of jet gun nozzle; Pan feeding flowrate control valve is arranged in bin blanking mouth.
The present invention adopts two coal-fired swirl nozzles of symmetry to enter burner hearth along furnace wall tangential direction, its combustion flame will become eddy flow and along furnace wall rising, modification agent will be heated into molten state at freeze profile, easily mix with molten state slag, the modification agent of liquid molten state carries a large amount of heats simultaneously, realizes the concurrent heating to molten state slag.Slag after upgrading can be directly used in prepares high value added product, avoided the simple, extensive of existing slag processing and utilizing mode form, and cold slag is carried out to the high energy consumption that reflow process causes, therefore can realize the two of " slag " of slag and " heat " are utilized, there is the mode utilized variation, utilization ratio feature high, good in economic efficiency, low in the pollution of the environment.
Accompanying drawing explanation
Fig. 1 upgrading furnace body schematic diagram;
Illustrate: 1-molten bath, 2-furnace bottom, 3-furnace bosh, 4-furnace roof, 5-vision slit, 6-flue, 7-smoke test pipe, 8-cooling water intake, 9-eddy flow spout, 10-gudgeon, 11-chassis, 12-refractory materials.
The coal-fired nozzle throat area of Fig. 2 furnace bosh place eddy flow schematic diagram;
Illustrate: 9-eddy flow spout, the coal-fired nozzle of 13-eddy flow, 14-furnace wall.
Fig. 3 coal dust and modification agent blowing device schematic diagram;
Illustrate: 15-gas feed, 16-jet gun, 17-pan feeding flowrate control valve, 18-feed bin, 19-spraying gun, 20-material, gas mixture outlet, 21-bin blanking mouth, 22-jet gun nozzle.
Fig. 4 molten steel slag modifying process schema.
Embodiment
Below in conjunction with specific embodiment, further describe the present invention, advantage and disadvantage of the present invention will be more clear along with description.But these embodiment are only exemplary, scope of the present invention are not formed to any restriction.It will be understood by those skilled in the art that under without departing from the spirit and scope of the present invention and can details of the present invention and form be modified or be replaced, but these modifications and replacement all fall within the scope of protection of the present invention.
Take and utilize flyash to become devitrified glass raw material embodiment of the present invention to be further described as example molten steel slag upgrading as modification agent, according to preparing the requirement of devitrified glass composition, the upgrading of molten steel slag is comprised to iron upgrading and devitrified glass upgrading two processes put forward, carry iron upgrading and put forward iron basicity 1.1 for first the dual alkalinity of slag being utilized flyash be adjusted into the best, then add reductive agent coal dust to reduce, after reduction finishes, again the basicity of slag is utilized flyash to be adjusted into 0.7 and made the composition of slag meet the requirement of devitrified glass.
In order to access the good molten steel slag of mobility, in implementation process, first slag is worn into slag micro powder, its composition is as shown in table 1, then the mixture of slag micro powder and coal dust is injected in upgrading stove by oxygen, utilize coal dust firing liberated heat that slag micro powder is melted, thereby obtain molten state slag, the technical analysis of coal dust is as shown in table 2.
Iron level in table 1 slag micro powder
The anthracitic technical analysis of table 2
In experiment, adopt pure oxygen as blowing gas, and the gas flow of every cover coal dust and modification agent blowing device is controlled as 30m
3/ h.Slag micro powder consumption 30Kg, slag micro powder and coal dust are by 1/2 prepare burden, therefore melting the required coal dust of slag is 60Kg, and ash oontent in coal dust is 10.08%, large appointment produces the ash content of 2kg left and right, and each component content is as shown in table 3 in ash content, very approaching with modification agent flyash composition, and need add 41.8% flyash when slag is adjusted to best reduction dual alkalinity 1.1, therefore still need the flyash of 6.54Kg, according to flyash and coal dust proportioning 1/1, also need to add the flyash of 13.08Kg and the mixture of coal dust.When slag basicity is adjusted to basicity 0.7, need add flyash is 90.2%, therefore after carrying iron and finishing, still need to add 48.4% flyash, be 14.52Kg flyash, ash content comprising flyash and coal dust firing generation, according to flyash and coal dust proportioning, be 1/1 again, knownly from basicity 1.1, adjust to needs flyash 13.17Kg, coal dust 13.17Kg at 0.7 o'clock, in upgrading process, each stage raw material consumption is as shown in table 4 below.
Table 3 coal dust ash content of coal composition
Each stage raw material consumption in table 4 upgrading process
Whole modifying process flow process as shown in Figure 4, before fusing slag micro powder, first in furnace bottom (2), put into a certain amount of timber and light, then promote chassis (11) by furnace bottom (2) be placed in furnace bosh (3) under, and by furnace bosh (3) below on furnace bottom (2), and furnace bosh (3) and furnace bottom (2) are linked by flange with bolt, at this moment open oxygen flow valve the timber in furnace bottom (2) is fully burned, fire box temperature is reached can firing coal-dust.At furnace bosh (3) end, slightly place, higher position is symmetrical two coal-fired swirl nozzles (13), and symmetrical (14) tangential direction along furnace wall of two coal-fired swirl nozzles (13) enters burner hearth, and coal-fired eddy flow spray 13 is connected with blowing device.To adding in feed bin (18) pure coal dust to continue preheating burner hearth, approximately after 5min by being mixed to join in feed bin (18) of slag and coal dust, start to melt slag.After the mixture winding-up of slag and coal dust finishes, continue pulverized coal injection ash, with the mixture of coal dust, the basicity of molten state slag is adjusted to 1.1.After blowing bundle to be painted, lift furnace bosh (3), in slag, add the coal dust of 2.4Kg and stir with iron staff.Then put down the pure coal dust that furnace bosh (3) continues the about 5min of winding-up, the iron in slag is reduced fully.It is 0.7 that the mixture that finally continues pulverized coal injection ash and coal dust makes the adjustment basicity of slag, lifts furnace bosh (3) and will pull chassis (11) that body of heater is hauled out after winding-up finishes, and with iron staff stirring slag, makes its composition reach even.Then rotate gudgeon (10) slag is poured in pond and carries out shrend, after the frit after shrend is dried, with magnet, select the metal iron block being wherein reduced out.After the iron block amount of selecting and shrend, in frit, iron level is as shown in table 5, by calculating the rate of recovery and the degree of metalization of known iron, is respectively 82% and 94%.
The iron amount that the experiment of table 5 molten state steel slag modification is reclaimed and the iron level in Water Quenching Slag
Claims (10)
1. a method for modifying for iron content slag, comprises successively upgrading, carries iron, secondary upgrading; It is characterized in that, a described upgrading comprises: the cold slag of iron content is melted in upgrading stove and obtain molten state iron content slag; The mixture of modification agent and coal dust is sprayed in the burner hearth of upgrading stove, utilize coal dust firing liberated heat to make modification agent fusing enter into molten state iron content slag with the form of high-temperature liquid state;
Described secondary upgrading comprises: carry iron and finish rear continuation to the mixture of jet in the burner hearth of upgrading stove modification agent and coal dust, slag is smelted again.
2. according to method for modifying claimed in claim 1, it is characterized in that, the described iron of carrying comprises: the furnace bottom of upgrading stove and furnace bosh are separated, reductive agent is joined in slag and reduces and carry iron.
3. according to method for modifying claimed in claim 2, it is characterized in that: described reductive agent is coal dust.
4. according to method for modifying claimed in claim 1, it is characterized in that: described iron content slag is molten steel slag.
5. according to method for modifying claimed in claim 1, it is characterized in that: described modification agent is flyash; At upgrading for the first time and for the second time in upgrading, the volume ratio of modification agent flyash and coal dust is 1:1.
6. a specific equipment of realizing method for modifying described in claim 1, comprises upgrading furnace body and blowing device; Described upgrading furnace body comprises furnace bottom (2), furnace bosh (3), furnace roof (4) three parts; Furnace bottom both sides symmetric design two gudgeons (10), by gudgeon (10) by furnace bottom (2) stand on chassis (11); Furnace roof (4) leaves a flue (6) in one side, leaves at an upper portion thereof a vision slit (5), in flue bottom design one circulating water smoke test pipe (7); It is characterized in that: at furnace bosh (3) end, slightly place, higher position is symmetrical two coal-fired swirl nozzles (13), symmetrical (14) tangential direction along furnace wall of two coal-fired swirl nozzles (13) enters burner hearth, and coal-fired eddy flow spray 13 is connected with blowing device.
7. according to specific equipment claimed in claim 6, it is characterized in that: described coal dust and modification agent blowing device are by gas feed (15), jet gun (16), pan feeding flowrate control valve (17), feed bin (18), spraying gun (19), material, gas mixture outlet (20), bin blanking mouth (21), jet gun nozzle (22) form; Wherein, jet gun (16) is positioned at the inside of spraying gun (19), and the place ahead of jet gun nozzle (22) is material, gas mixture outlet (20), and feed bin (18) is connected by feed opening (21) with spraying gun (19); Feed opening (21) is positioned at the back upper place of jet gun nozzle; Pan feeding flowrate control valve (17) is arranged in bin blanking mouth (21).
8. according to specific equipment claimed in claim 6, it is characterized in that: between furnace bosh (3) and furnace bottom (2), adopt flange to be connected.
9. according to specific equipment claimed in claim 6, it is characterized in that: its 2 times of being furnace bottom (2) height of furnace bosh (3) height.
10. according to specific equipment claimed in claim 6, it is characterized in that: half that furnace roof (4) is furnace bottom (2) height.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104986961A (en) * | 2015-07-21 | 2015-10-21 | 北京蓝昊环保设备有限公司 | Method for tempering high temperature slag and mineral cotton production method |
| CN114908212A (en) * | 2022-04-24 | 2022-08-16 | 北京科技大学 | Method for reducing viscosity of steel slag by chemically and online tempering steel slag of electric arc furnace |
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