CN104141019B - 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 PDF

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Publication number
CN104141019B
CN104141019B CN201410305578.8A CN201410305578A CN104141019B CN 104141019 B CN104141019 B CN 104141019B CN 201410305578 A CN201410305578 A CN 201410305578A CN 104141019 B CN104141019 B CN 104141019B
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furnace
slag
modification
coal
modifier
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CN104141019A (en
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杨志杰
张战军
苗瑞平
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High Aluminum Coal Resources Development and Utilization R&D Center of Datang International Power Generation Co Ltd
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High Aluminum Coal Resources Development and Utilization R&D Center of Datang International Power Generation Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, 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

The method for modifying of iron content slag and its special equipment
Technical field
The present invention relates to the iron content slag producing in the smelting process of the Application way of metallurgical cinder, more particularly, to metal Method for modifying and the special equipment realizing the method, belong to the modification field of iron content slag.
Background technology
Create substantial amounts of high-temperature molten-state slag in the smelting process of current black and non-ferrous metal, these slags be by Smelt stone-like pulse being mingled with the slag former needing to be deliberately added into or Ore etc. to be formed, its main component is SiO2、CaO、 MgO、Al2O3、FeO、Fe2O3Deng oxide, because the fusing point of these oxides and its complex compound being constituted is all higher, The temperature of the slag therefore discharged in metallurgical process is higher than all typically 1500 DEG C, and the process to these slags utilizes almost at present It is entirely to be directed to cold conditions slag, and the mode utilizing is also fairly simple, extensive, a part is produced cement, non-burning brick, bone of paving the way The construction materials such as material, a part returns in smelting procedure after simple process again, also greatly due to being located Reason using and be landfilled, heap is abandoned, and therefore has that utilization rate is relatively low, a series of problems, such as deficiency in economic performance, environmental pollution are serious.
Simultaneously because the temperature of slag is higher and its hot melt is larger thus it has contained huge heat energy although right both at home and abroad The recycling of slag heat has carried out substantial amounts of research, but is also concentrated mainly on by physics heat exchange or chemical energy transform mode Single way of recycling, nearly all because equipment is complicated, operation cost is high, heat energy recovery rate and the low problem of economic benefit lead to Large-scale industrialization could not be realized.
In a word, there is following problem to the utilization of slag at present:
(1) to slag using being both for " slag " and " hot " individually with ultimately resulting in that utilization rate is low, deficiency in economic performance Deng.
(2) because the composition of slag is difficult to meet needs during the utilization to slag, a part can be by quenched under cold conditions It is obtained by it is therefore desirable to slag be carried out with broken pulverizing, especially for the slag of hardness is bigger, this technical process efficiency is very low, energy Consumption is higher, and the added value of product prepared is typically all relatively low.And the slag of the overwhelming majority is due to its composition and target material Composition requirements difference is larger or cold conditions under cannot realize quenched leading to it can only go out of use.
(3) the heat almost all of slag is wasted, even if reclaiming certain heat energy using a certain technique at present, but also needs Pay very high cost.And also need to cold slag is carried out reheating fusing sometimes for using slag, greatly improve profit Use cost.
In order to effectively utilize slag, need slag is modified;At present, to face main in molten state slag upgrading processes Face following problem to have much room for improvement:1. the mode of heating of melting materialss:Because modification agent needs for cold burden thus in upgrading processes Heating is melted, thus then extremely important from which kind of mode of heating.2. the feed postition of modification agent:Due to molten state slag Viscosity is larger, and the decline of viscosity with temperature can increase rapidly, will in molten state slag if be therefore directly added to cold burden Make slag quick solidification, and it is very high to be melted then extremely difficult, cost again.3. the blending manner of molten state slag and modification agent:As Fruit molten state slag is directly mixed with solid-state modification agent, is extremely difficult to uniformly, and modification agent can be covered in slag surface, makes slag Crust.
Content of the invention
The technical problem to be solved is to overcome the deficiencies in the prior art, provides that a kind of processing cost is low, slag A kind of method for modifying of the wide iron content slag of utilization scope.
Present invention firstly provides a kind of method for modifying of iron content slag, the method includes once modifying successively, carry ferrum, two Secondary modification;Wherein, described once modification includes:By cold for iron content slag, in modification stove, fusing obtains molten state iron content slag;Will The mixture of modification agent and coal dust sprays in the burner hearth of modification stove, so that modification agent is melted with height using coal dust firing liberated heat The form of warm liquid enters in iron content slag;
The described ferrum that carries includes:Furnace bottom and the furnace bosh of modification stove are separated, reducing agent is added in slag, to modification stove Burner hearth in spray into pure coal dust firing heat release, maintain reduction in the burner hearth of modification stove to put forward the temperature of ferrum;
Described secondary modification includes:Carry continue after ferrum terminates mixed to injection modification agent in the burner hearth of modification stove and coal dust Compound, smelts again to slag.
Wherein, described iron content slag is preferably molten steel slag.
Described modification agent is preferably flyash.In first time modification and second modify, modification agent flyash and The volume ratio of coal dust is preferably 1:1.
It is preferably coal dust carrying the reducing agent described in ferrum step.
The mode that present invention employs combusting coal fines carries out heating fusing to modification agent, and main consideration coal dust is a kind of compared with warp The fuel of Ji, ignition temperature is high and technology relative maturity, uses for reference the slag tap technology in thermal power plant simultaneously, by modification agent with It is blown after coal dust mixing simultaneously, so can efficiently utilize very much the heat of coal dust firing, modification agent is melt into liquid, and The modification agent of liquid is then very easy to mix homogeneously with molten state slag, and the modification agent of liquid carries substantial amounts of heat simultaneously, can Concurrent heating is carried out to molten state slag.In order to improve the heat utilization ratio of coal powder injection burning, the present invention is once modifying and is changing for the second time During matter, by the mixture of modification agent and coal dust pass through two symmetrically coal-fired swirl nozzle along modification stove furnace wall tangential direction Spray in burner hearth;When coal dust is in stove chamber inner combustion, its combustion flame will freeze profile become eddy flow and along furnace wall slow on Rise, the time of staying in stove for the high-temperature gas can be extended, and then enhance the heat utilization rate of coal dust firing.
It is a further object of the present invention to provide a kind of realize described in change the special equipment of quality method.
It is another object of the present invention to be achieved through the following technical solutions:
A kind of realize described in change the special equipment of quality method, including:Modification furnace body and blowing device;Described modification Furnace body includes furnace bottom, furnace bosh, furnace roof three part;Two gudgeons of furnace bottom both sides symmetric design, by gudgeon by furnace bottom stand On chassis;Furnace roof leaves a flue in its side, leaves an observation port at an upper portion thereof, devises a circulation in stack base Water cooling smoke test pipe;Wherein, it is symmetrical two fire coal swirl nozzle at the slightly higher position in furnace bosh bottom, two coal-fired eddy flows What nozzle was symmetrical enters burner hearth along furnace wall tangential direction, and coal-fired eddy flow spray is connected with blowing device;When coal dust is in burner hearth internal combustion During burning, its combustion flame will become eddy flow in freeze profile and slowly rise along furnace wall, can extend high-temperature gas in stove The time of staying, and then enhance the heat utilization rate of coal dust firing.
Wherein, preferably employ flange between furnace bosh and furnace bottom to be connected, facilitate furnace bosh to separate with furnace bottom, so as by reducing agent plus Enter and in slag, slag is reduced.
Furnace waist height its be 2 times of furnace bottom height, relatively long furnace bosh is conducive to extending high-temperature flue gas stopping in stove Stay the time;Furnace roof height is less, essentially the 1/2 of furnace bottom.
Described coal dust and modification agent blowing device are by gas feed, jet gun, pan feeding flow control valve, feed bin, material spray Rifle, material, gas mixture outlet, bin blanking mouth, jet gun nozzle composition;Wherein jet gun is located at the inside of spraying gun, jet The front of rifle nozzle is material, gas mixture outlet, and feed bin is connected by feed opening with spraying gun;Feed opening is located at jet gun and sprays The back upper place of mouth;Pan feeding flow control valve is arranged in bin blanking mouth.
The present invention adopt two symmetrically coal-fired swirl nozzle enter burner hearth along furnace wall tangential direction, its combustion flame will be Freeze profile becomes eddy flow and along slow rising the in furnace wall, modification agent is heated into molten state, easily mixs homogeneously with molten state slag, The modification agent of liquid molten state carries substantial amounts of heat simultaneously, realizes the concurrent heating to molten state slag.Slag after modification can directly be used In preparing high value added product, it is to avoid existing Slag treatment Land use systems form simple, extensive, and cold slag is carried out with weight The high energy consumption that molten process is led to, therefore, it is possible to realize double utilizations of " slag " to slag and " hot ", has Land use systems various Change, utilization rate feature high, good in economic efficiency, low in the pollution of the environment.
Brief description
Fig. 1 modifies furnace body schematic diagram;
Illustrate:1- molten bath, 2 furnace bottoms, 3 furnace bosh, 4 furnace roofs, 5 observation ports, 6 flues, 7 smoke tests Pipe, 8 cooling water intakes, 9 eddy flow spouts, 10 gudgeons, 11 chassis, 12 refractory materials.
Eddy flow fire coal nozzle throat area schematic diagram at Fig. 2 furnace bosh;
Illustrate:9 eddy flow spouts, 13 eddy flow fire coal nozzles, 14 furnace walls.
Fig. 3 coal dust and modification agent blowing device schematic diagram;
Illustrate:15 gas feeds, 16 jet guns, 17 pan feeding flow control valves, 18 feed bins, 19 material sprays Rifle, 20 material, gas mixture outlet, 21- bin blanking mouth, 22- jet gun nozzle.
Fig. 4 molten steel slag modifying process flow chart.
Specific embodiment
To further describe the present invention with reference to specific embodiment, advantages of the present invention and feature will be with description and Apparent.But these embodiments are only exemplary, any restriction is not constituted to the scope of the present invention.People in the art Member it should be understood that lower without departing from the spirit and scope of the present invention can modifying to the details of the present invention and form or Replace, but these modifications and replacement each fall within protection scope of the present invention.
Taking molten steel slag is modified to devitrified glass raw material by the use of flyash as modification agent as a example to embodiment party of the present invention Formula is further described, and according to preparing devitrified glass component requirements, the modification to molten steel slag includes carrying ferrum modification and crystallite glass Glass modifies two processes, carries ferrum and modifies and most preferably puies forward ferrum basicity 1.1 for being adjusted to the dual alkalinity of slag using flyash first, so Reducing agent coal dust is added to be reduced afterwards, again using flyash, the basicity of slag being adjusted to 0.7 after reduction terminates makes slag Composition meet the requirement of devitrified glass.
In order to obtain the preferable molten steel slag of mobility, in implementation process, first slag is worn into slag micro powder, The mixture of slag micro powder and coal dust as shown in table 1, is then injected in modification stove, using coal dust combustion by its composition by oxygen Burn liberated heat to melt slag micro powder, thus obtaining molten state slag, the Industrial Analysis of coal dust is as shown in table 2.
Iron content in table 1 slag micro powder
The anthracitic Industrial Analysis of table 2
Adopt pure oxygen in experiment as blowing gas, and the gas flow of often set coal dust and modification agent blowing device is controlled to 30m3/h.Slag micro powder consumption 30Kg, slag micro powder and coal dust by 1/2 carry out dispensing, therefore needed for fusing slag, coal dust is then For 60Kg, and the content of ashes in coal dust is 10.08%, then big appointment produce 2kg about ash, and in ash, each composition contains Amount as shown in table 3, with modification agent fine coal ash component closely, and slag is adjusted to most preferably reduce during dual alkalinity 1.1 and needs Add 41.8% flyash, therefore still need to the flyash of 6.54Kg, according to flyash and coal dust proportioning 1/1, then also need to add Enter the flyash of 13.08Kg and the mixture of coal dust.Slag basicity is adjusted to during basicity 0.7 to add the flyash be 90.2%, therefore carry the flyash still needing to add 48.4% after ferrum terminates, i.e. 14.52Kg flyash, including flyash and The ash that coal dust firing produces, and be 1/1 according to flyash and coal dust proportioning, then understand needs when basicity 1.1 is adjusted to 0.7 Flyash 13.17Kg, coal dust 13.17Kg, in upgrading processes, each stage raw material dosage is as shown in table 4 below.
Table 3 coal dust ash content of coal composition
Each stage raw material dosage in table 4 upgrading processes
Whole modifying process flow process is as shown in figure 4, before fusing slag micro powder, put into certain first in furnace bottom (2) The timber of amount is simultaneously lighted, and then promotes chassis (11) that furnace bottom (2) is placed in the underface of furnace bosh (3), and by below furnace bosh (3) in On furnace bottom (2), blending bolt is passed through flange and is linked furnace bosh (3) and furnace bottom (2), and at this moment opening oxygen flow valve makes furnace bottom (2) In timber be fully burned, so that fire box temperature is reached can firing coal-dust.It is symmetrical two at the slightly higher position in furnace bosh (3) bottom Individual fire coal swirl nozzle (13), what two coal-fired swirl nozzles (13) were symmetrical enters burner hearth, combustion along furnace wall (14) tangential direction Coal eddy flow spray 13 is connected with blowing device.Pure coal dust is added to continue preheating burner hearth, by steel after about 5min in feed bin (18) Slag is mixed to join in feed bin (18) with coal dust, starts to melt slag.After the mixture injection of slag and coal dust terminates, continue The basicity of molten state slag is adjusted to 1.1 with the mixture of coal dust by continuous pulverized coal injection ash.Furnace bosh is lifted after blowing bundle to be painted (3) in slag, add the coal dust of 2.4Kg and be stirred with iron staff.Then put down furnace bosh (3) and continue injection about 5min's Pure coal dust, makes the ferrum in slag sufficiently be reduced.Finally continuing grey and coal dust the mixture of pulverized coal injection makes the tune of slag Whole basicity is 0.7, and injection is lifted furnace bosh (3) and pulled on chassis (11) after terminating and hauls out body of heater, makes it with iron staff stirring slag Composition reaches uniformly.Then rotate gudgeon (10) and slag is poured in pond and carry out water quenching, the frit after water quenching is dried Select the metal iron block being wherein reduced out afterwards with Magnet.In iron content such as table 5 in frit after the iron block amount selected and water quenching Shown, it is respectively 82% and 94% by calculating the response rate understanding ferrum and degree of metalization.
Iron content in the iron of table 5 molten state steel slag modification experiment recovery and Water Quenching Slag

Claims (1)

1. a kind of special equipment of iron content slag modification, including modification furnace body and blowing device;Described modification furnace body bag Include furnace bottom (2), furnace bosh (3), furnace roof (4) three part;Two gudgeons (10) of furnace bottom both sides symmetric design, will by gudgeon (10) Furnace bottom (2) stand is on chassis (11);Furnace roof (4) leaves a flue (6) in its side, leaves an observation port at an upper portion thereof (5), devise circulating water smoke test pipe (7) in stack base;It is symmetrical two at the slightly higher position in furnace bosh (3) bottom Individual fire coal swirl nozzle (13), what two coal-fired swirl nozzles (13) were symmetrical enters burner hearth, combustion along furnace wall (14) tangential direction Coal swirl nozzle (13) be connected with blowing device it is characterised in that:Described blowing device is by gas feed (15), jet gun (16), pan feeding flow control valve (17), feed bin (18), spraying gun (19), material, gas mixture outlet (20), bin blanking mouth (21), jet gun nozzle (22) composition;Wherein, jet gun (16) is located at the inside of spraying gun (19), jet gun nozzle (22) Front is material, gas mixture outlet (20), and feed bin (18) is connected by feed opening (21) with spraying gun (19);Feed opening (21) Back upper place positioned at jet gun nozzle;Pan feeding flow control valve (17) is arranged in bin blanking mouth (21);Described furnace bosh (3) with Flange is adopted to connect between furnace bottom (2), furnace bosh (3) is highly 2 times of furnace bottom (2) height, furnace roof (4) is furnace bottom (2) height Half.
CN201410305578.8A 2014-06-30 2014-06-30 Modification method of iron-containing slag and special equipment for modification method Active CN104141019B (en)

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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

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CN2814161Y (en) * 2005-02-02 2006-09-06 上海宝珥动力设备有限公司 Fly ash melting furnace
CN101445848B (en) * 2008-12-22 2010-08-11 莱芜钢铁集团有限公司 Process and device for continuous steelmaking from ferriferous material
CN101914639A (en) * 2010-09-08 2010-12-15 北京科技大学 Method for recycling iron on line from iron-containing industrial slag and preparing glass ceramics frit
CN103553340B (en) * 2013-11-05 2015-08-12 北京科技大学 Blast furnace slag produces die casting process method and the equipment thereof of devitrified glass
CN204224623U (en) * 2014-06-30 2015-03-25 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 The specific equipment of iron content slag upgrading

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