CN104372170B - Method and system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge - Google Patents
Method and system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge Download PDFInfo
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- CN104372170B CN104372170B CN201410543047.2A CN201410543047A CN104372170B CN 104372170 B CN104372170 B CN 104372170B CN 201410543047 A CN201410543047 A CN 201410543047A CN 104372170 B CN104372170 B CN 104372170B
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- dedusting ash
- mud
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
Abstract
The invention discloses a method and a system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge. The preparation method comprises the following steps: 1), preparing the steel plant dedusting ash or the steel plant sludge; 2), in accordance with the mass ratio, weighting raw materials of 75-85% of the steel plant dedusting ash and/or the steel plant sludge, 10-20% of iron oxide scales and 2-15% of bentonite, and mixing evenly; 3), fine blending the mixture with water, and carrying out ball pressing and molding into pellets; 4), sending the prepared pellets into a closed still kettle, directly introducing steam, carrying out steam curing heating on the pellets, and allowing to generate a steam curing reaction, wherein a steam curing medium is water steam, the steam curing pressure is 0.05-1.4 MPa, the water steam temperature is 105 DEG-195 DEG C, and the steam curing time is 0.5-2 h; and 5), carrying out dust separation and screening on the product after steam curing, and thus finally obtaining the finished product. The cooled pellets are prepared by the method, so that the energy can be saved, the production equipment investment and the production cost are reduced, the production cycle is shortened, and the product quality is improved.
Description
Technical field
The invention belongs to iron and steel metallurgical industry, it is related to a kind of steel mill dedusting ash or steel mill's mud makes cooling slag making pelletizing
Method.
Background technology
Requirement with environmental legislation is more and more tighter, and the requirement to iron and steel enterprise's environmental suitability also improves constantly.Therefore,
The technical method that some reduce energy resource consumption, minimizing waste discharge and scrap concrete recycling is pushed greatly in steel mill
Extensively.Some steel mill's scrap concrete, the reuse technologies developed in recent years have all been succeeded application.These technology can be realized all
As reduced waste discharge, saving waste treatment expense, recycle the effect that part contains fe, zn product.Steel mill's dedusting ash
With steel mill's mud, in steel mill's garbage, occupy important proportion, if enabling its recycling, to protection social environment, fall
Low entreprise cost is significant, it is reported that, often recycle one ton of dedusting ash and can save 500 yuan.
Currently for the process of dedusting ash, typically take following technique: steel-making dedusting ash passes through a literary composition, two literary compositions, gravity
Dehydrator, elbow separator, wet rotation dehydrator bring sump into by converter turbid circulating water, enter back into sewage disposal device, through precipitation
Mud is transported to pelletizing workshop afterwards, as the raw material of coal-pressing ball, adds bentonite and binding agent, makes pelletizing after mixing, baking
Obtain afterwards cooling down slag making pelletizing (referred to as cooling down pelletizing afterwards), pelletizing will be cooled down and send into converter high hopper, can be used as converter
The coolant of steel-making.
But, the method device therefor quantity is a lot, and the requirement to each equipment is also very high, therefore equipment cost and maintenance cost
All very high.In addition, the method needs dryer section twice to can be only achieved finished product, drying existing steam heating and two kinds of electrical heating, steam
Vapour is heated to be radiator heat exchange, and thermal losses is big, and electrically heated heat conversion is low, therefore the overall height that consumes energy；Due to existing pelletizing system
Make technique, and drying equipment restricts, general yield is generally low；Rate of drying is low, and the yield of drying equipment, leads to yield to be subject to
Restriction, long preparation period；Pellet quality depends primarily on pellet strength, hardness, water content and the ball press quality making pelletizing,
Existing pelletizing processing technology is wanted to produce qualified pelletizing, pressure ball is required very high, needs high-pressure ball press to make pelletizing, this
Directly result in pressure ball equipment cost high, electric power energy has high demands, power consumption is big, then again under atmospheric pressure state, 150 DEG C of left sides of temperature
The right side, the drying time that the elapsed time is up to more than 12 hours just can obtain qualified pelletizing.Although as above time consumption and energy consumption consumes
Equipment cost, but the quality of gained pelletizing is but difficult to improve a lot, the problems such as still easily efflorescence；Meanwhile, add in production
Plus binding agent be generally cmc tar starch polyethylene alcohol (one of best binding agent in domestic market), the market price is minimum
5000 yuan/ton, pelletizing content is not less than 2%, calculates by one ton of pelletizing, and pelletizing per ton contains 20kg, cost 100 yuan/per ton, by
This improves production cost, and cmc tar starch polyethylene alcohol also has that resistance to elevated temperatures is poor, easily lose in roasting process
The shortcomings of viscosity causes pelletizing pulverization rate, the hardness of impact pelletizing and intensity.More it is essential that this physical method be obtained pelletizing
The viscosity of middle binding agent also has, and on molten steel, before also not throwing in, pelletizing is easily because secondary high-temperature viscous storehouse to feed bin occurs
Problem, when leading to throw in, the injected volume control of cooling slag making pelletizing can not be accurate, not only affects the effect cooling down, more directly affects
The quality of molten steel and purity.
Content of the invention
The technical problem to be solved be provide a kind of energy-saving and environmental protection, good product quality use steel mill's dedusting ash
Or steel mill's mud makes the method and system of cooling slag making pelletizing, at present in steel mill's dedusting ash or steel mill's mud recycling
High energy consumption present in method, high equipment investment and low output, low quality etc. are not enough and unreasonable, have considered each side
After factor, to recycling the design that technique has all carried out again to parameters of technique process etc. from material choice to device layout,
Design content includes:
(1) prepare in the raw material of pelletizing, without any binding agent of the other in addition to bentonite；
(2) remove twice drying unit when preparing producing line system, can be selected for lower-powered ball press；
(3) prepare pelletizing finished product using steam-cured method and using suitable parameters.
The present invention to realize particular by technical scheme below:
A kind of use steel mill dedusting ash or steel mill's mud make the method cooling down slag making pelletizing, comprise the steps:
1), prepare steel mill's dedusting ash or steel mill's mud, prepare can to make steel dedusting with dry collection method during steel mill's dedusting ash
Ash is collected by sack cleaner, is transported to pelletizing workshop, completes the preparation of steel mill's dedusting ash；Prepare to use wet method during steel mill's mud
Collecting method will be made steel dedusting ash and be passed through a literary composition, two literary compositions, gravity dewatering apparatus, elbow separator, wet rotation dehydrator by converter turbid circulating water
Bring sump into, enter back into sewage disposal device, after precipitation mud is transported to pelletizing workshop, complete the preparation of steel mill's mud.
2) content of ferrum and the technique complexity of recovery needed for, the present invention considers general cooling pelletizing finished product,
Determine eventually according to mass ratio be steel mill's dedusting ash and/or steel mill's mud 75～85%, iron scale 10～20%, bentonite 2～
15% ratio weighs raw material mix homogeneously；Wherein specifically, steel mill's dedusting ash and/or steel mill's mud, oxygen have been taken into full account
Change the practical problem of iron sheet, the respective performance of bentonite and recycling: steel mill's dedusting ash and/or steel mill's mud are sharp as reclaiming
Main body, its content is more beneficial to returning of steel mill's waste material steel mill dedusting ash and steel mill's mud when making pelletizing using must be more
Receive, beneficial to energy-saving and emission-reduction, so that the cost of material of finished product is reduced, meanwhile, iron scale is used for supplementing ferrum element, and price is relatively
Height, if consumption is fewer, is more beneficial to reduces cost, in the case of aforementioned proportion, can be according to steel mill to the iron content cooling down pelletizing
The selection of the suitability is done in the requirement of amount to the amount of steel mill's dedusting ash or steel mill's mud, iron scale；The present invention considers follow-up work
Skill is chemical method, and does not dry the problem of cracking, therefore can suitably reduce the requirement to pressure ball molding, also can reduce to former
The requirement of adhesive effect between material is also cost-effective simultaneously and avoids follow-up viscous storehouse problem, and inventor selects in the feed
Without binding agent, and bentonite uses as similar binding agent, if the amount using is fewer, the purity of pelletizing is higher, more sharp
In the quality improving pelletizing, based on follow-up steam curing process, meanwhile, one is to consider that bentonite exists as similar binding agent to the present invention
The content must having in technique, two is that after equilibrium, preferably bentonitic mass ratio is controlled to 3 in order to improve the purity of pelletizing and quality
～6%.
3), said mixture is finely tuned and make pelletizing through pressure ball molding after water, for the benefit of pelletizing molding, preferably, adjust
In mixture after entering minor amount of water, moisture accounts for the 1～20% of mixture gross mass；It is chemical method in view of subsequent technique, and
Do not dry the problem of cracking, inventor, through test of many times, finds can suitably reduce the requirement to pressure ball molding, thus conduct
Preferably, suitably reduce the requirement to pressure ball, that is, in pressure ball molding, can be selected for lower-powered ball press and carry out pressure ball molding,
One is to greatly save equipment cost, and two is to greatly save electric power energy；More optimizedly, using two lower-powered ball presses,
First it is used for precompressed using one, reuse other one for pressure ball molding.
4), above-mentioned prepared pelletizing is sent in airtight still kettle, directly lead to steam and steam-cured heating is carried out to pelletizing, make
There is steam-cured reaction in it, steam-cured medium is vapor, and steam-cured pressure is 0.05～1.4mpa, and steam temperature is 105 DEG C～195
DEG C, steam-cured time 0.5～2h.Steam curing process directly leads to steam to carry out steam-cured heating in closed pressure vessel, compares steam
Heat exchange and electrical heating utilization rate are high, according to pressure come regulating time, can greatly save production efficiency.The main object of the present invention is
Consume steel mill's dedusting ash and steel mill's mud and prepare cooling pelletizing, inventor, through the analysis to composition, determines preparing pelletizing
When using steam-cured reaction, the present invention, through test of many times, finds that pressure just can start in more than 0.05mpa steam-cured to pelletizing,
General pressure is bigger, and the steam-cured time is shorter, and what the energy consumption doing a ton was converted into cost is the 1/3 of process energy consumption in the past, significantly saves
The about energy, and steaming maximum pressure when oxygen kettle is typically designed is 1.4mpa, therefore for considering to save using common steaming oxygen kettle
About system cost, therefore take above-mentioned steam-cured pressure 0.05～1.4mpa.
5), by above-mentioned steam-cured after product carry out dust separation screening, finally obtain finished product.
Present invention also offers one kind is used for realizing above-mentioned use steel mill dedusting ash or steel mill's mud makes cooling slag making pelletizing
The system of method, the proportioner comprising to set gradually, mixing arrangement, ball press system, still kettle system, screening plant, under
Material device；Described proportioner is used for for raw material entering mixing arrangement from proportioner；Described mixing arrangement is used for mixing raw material
Close uniformly, described ball press system is used for the raw material of mix homogeneously being carried out pressure ball molding, then by pressure ball molding gained pelletizing
Send into still kettle system and carry out steam-cured, described screening plant is used for carrying out dust screening to the pelletizing after steam-cured；Described mixing dress
Put containing priming apparatus, for the material fine setting water entering mixing arrangement；For greatling save equipment cost and electric power energy, as
Preferably, ball press system selects lower-powered ball press, more optimizedly, using two lower-powered ball presses, first uses
One is used for precompressed, reuses other one for pressure ball molding.
Compared with the making thinking of existing cooling slag making pelletizing, the present invention differs primarily in that:
1. the raw material making pelletizing is different
The raw material of the present invention, in addition to adding iron scale and bentonite in steel mill's dedusting ash or steel mill's mud, does not add
Plus other binding agents.Under existing process, in raw material, also need to add binding agent, the binding agent of interpolation is generally cmc tar starch
Polyvinyl alcohol (one of best binding agent in domestic market), minimum 5000 yuan/ton of the market price, pelletizing content is not less than 2%, presses
One ton of pelletizing calculates, and pelletizing per ton contains 20kg, that is, thus much one just cost is improve 100 yuan/ton, and for steel mill,
The demand of pelletizing is very large, long-range apparently, cost just improves a lot；In addition, cmc tar starch polyethylene alcohol also has
The shortcomings of resistance to elevated temperatures is poor, volatile vanishing viscosity causes pelletizing pulverization rate in roasting process, the hardness of impact pelletizing and intensity,
Reduce practical efficiency in cooling procedure for the pelletizing；More it is essential that current method belongs to physical method, the method is obtained
Pelletizing in the viscosity of binding agent will not change because the temporary transient feed bin placing cooling pelletizing is on molten steel, also do not throwing
Before putting, pelletizing is just easily because the problem of viscosity of binding agent therein generating unit bulb separation group when by secondary high-temperature is asked in viscous storehouse
Topic, when leading to throw in, the injected volume control of cooling slag making pelletizing can not be accurate, not only affects the effect cooling down, does not reach estimated
Cooling-down effect, more because directly affecting quality and the purity of steel finished product the problems such as component ratio.The present invention considers subsequent technique
For chemical method, and do not dry the problem of cracking, therefore can suitably reduce the requirement to pressure ball molding, can reduce to raw material yet
Between adhesive effect requirement, be also cost-effective simultaneously and avoid follow-up viscous storehouse problem, inventor selects in the feed not
Add binding agent.
2. the less ball press of available horsepower carries out pressure ball molding
Because adopting steam curing process, steam curing process is chemical method, and does not dry the problem of cracking, therefore inventor passes through
Test of many times, finds can suitably reduce the requirement to pressure ball molding, so, the less ball press of available horsepower carries out pressure ball one-tenth
Type, one is reduction of equipment cost, and two are reduction of the energy consumption cost in production process.
3. prepare pelletizing finished product with steam-cured method
Steam curing process is directly to lead to steam in closed pressure vessel to carry out steam-cured heating, adds than steam heat-exchanging and electricity
Heat utilization efficiency is high, and according to pressure come regulating time, pressure just can start, general pressure steam-cured to pelletizing in more than 0.05mpa
Bigger, the steam-cured time is shorter, and what the energy consumption doing a ton was converted into cost is the 1/3 of process energy consumption in the past, greatlys save the energy.
Under enough pressure and temperatures, the steam-cured pelletizing of still kettle belongs to chemical reaction, and the pellet quality obtaining is good: pelletizing
Intensity is up to 65kg/cm2More than, compared with the 15kg/cm of existing process2Improve a lot, after pellet strength increases, one is permissible
Greatly reduce the breaking and Dusting rate that pelletizing causes before being transported to feed bin in transmission belt because of mutual collision or difference in height etc., by
This greatly improves the utilization rate of cooling pelletizing, and two when being to put in molten steel as coolant, and the speed because of decomposes can phase
To relatively slow, extending it as the time of coolant, so improving cooling effectiveness, thus can reduce the use of pelletizing needed for cooling
Amount；When pelletizing is used as coolant cooling molten steel, for ensureing the quality of steel finished product, pelletizing moisture is more few better, this
Bright prepared pelletizing moisture is 4% about, much lower compared with minimum the 8% of existing process, and if under existing process, make
Pelletizing moisture be less than 8% when, water content is lower, and pulverization rate is higher, and yield rate is lower, thus the method for the present invention obtain
Low-moisture also do not reduce yield rate simultaneously, there is good practical value；The pelletizing size maximum of the present invention can reach
60mm, is 1.5 times of 40mm of existing process, pelletizing size is bigger, and one is that yield is high, and two is to put into molten steel as coolant
When middle, the speed of decline is fast, and the depth of decline is also deep, therefore heat absorption is fast, and the area of cooling is wide, efficiency high；Three is not have in pelletizing
Binding agent, bentonite through steam-cured reaction also without viscosity, even if also will not stick together material through post bake in feed bin
The problem in storehouse is it is easy to precise control cools down the injected volume of pelletizing.
4th, the equipment preparing the system requirements of pelletizing is few, less demanding to equipment
Preparation system needed for the present invention only needs to comprise proportioner, mixing arrangement (containing priming apparatus), ball press system,
Still kettle system, screening plant, blanking device, compared with prior art rotary drying device, proportioner, mixing arrangement (containing plus
Water installations), ball press system, curer system, blanking device overall device reduces a lot, and the requirement to ball press system also can have
Very big reduction, greatly reduces equipment cost and maintenance cost, and the power consumption cost of equipment itself also has substantial degradation.
Compared with prior art, the invention has the beneficial effects as follows:
After the present invention has considered the factor of each side, to recycle technique from material choice to device layout to work
Skill procedure parameter etc. has all carried out design again, using new composition of raw materials, in conjunction with rational mass ratio, then coordinates steam-cured
Technique and rigorous parameter, finally give cooling pelletizing, benefit of the invention is that: one is to do one ton of energy consumption to be converted into cost
Before being, the 1/3 of process energy consumption, greatlys save the energy；Two is the process not needing to be dried twice, and steam-cured general pressure is got over
Greatly, the steam-cured time is shorter, substantially reduces the production cycle, and 12 hours from before shorten to 2～3 hours, improve production
Efficiency；Three be gained pellet quality good: 1, pellet strength: 65kg/cm2, compared with the 15kg/cm of existing process2Improve a lot,
After pellet strength increases, one is can to greatly reduce pelletizing to collide or high because mutual in transmission belt before being transported to feed bin
The breaking and Dusting rate that degree difference etc. causes, thus greatly improves the utilization rate of cooling pelletizing；2nd, pelletizing moisture: 4% about, more existing
Minimum the 8% of technique is much lower, and if make under existing process moisture be less than 8% when, water content is lower, pulverization rate
Higher, yield rate is lower；3rd, pelletizing size: maximum can reach 60mm, is 1.5 times of 40mm of existing process, pelletizing size is got over
Greatly, one is that yield is high, and two when being to put in molten steel as coolant, and the speed of decline is fast, and the depth of decline is also deep, therefore heat absorption
Quickly, the area of cooling is wide, efficiency high；Three is not have binding agent in pelletizing, and bentonite reacts also without viscosity through steam-cured,
Even if in feed bin through post bake also will not stick together feed bin problem it is easy to precise control cool down pelletizing injected volume.
Cooling pelletizing is produced by the method for the present invention, significantly reduces production and cost of investment, for wider in China
General energy-saving and emission-reduction of promoting serve positive effect with recycling steel mill's dedusting ash or steel mill's mud, have very high economic valency
Value.
Brief description
Fig. 1 is the process chart of the present invention.
Specific embodiment
Embodiment 1
A kind of use steel mill dedusting ash or steel mill's mud make the method cooling down slag making pelletizing, comprise the steps:
1), prepare steel mill's dedusting ash or steel mill's mud, dedusting ash will be made steel with dry collection method and be received by sack cleaner
Collection, is transported to pelletizing workshop；Or dedusting ash will be made steel by a literary composition, the dehydration of two literary compositions, gravity dewatering apparatus, elbow with wet method collecting method
Device, wet rotation dehydrator bring sump into by converter turbid circulating water, enter back into sewage disposal device, after precipitation mud are transported to pelletizing
Workshop；
2), according to mass ratio be steel mill's dedusting ash and/or steel mill's mud 75%, iron scale 12%, bentonite 13%
Ratio weighs raw material mix homogeneously；
3), said mixture is finely tuned and make pelletizing through pressure ball molding after water；In mixture after calling in minor amount of water, moisture contains
Amount accounts for the 5% of mixture gross mass；Adopt two lower-powered ball presses during pressure ball molding, be first used for precompressed using one,
Reuse other one for pressure ball molding；
4), above-mentioned prepared pelletizing is sent in airtight still kettle, directly lead to steam and steam-cured heating is carried out to pelletizing, make
There is steam-cured reaction in it, steam-cured medium is vapor, and steam-cured pressure is 0.05mpa, and steam temperature is 105 DEG C, the steam-cured time
2h；
5), by above-mentioned steam-cured after product carry out dust separation screening, finally obtain finished product.
The pellet strength of prepared cooling pelletizing is 30kg/cm to the maximum2.
Embodiment 2
A kind of use steel mill dedusting ash or steel mill's mud make the method cooling down slag making pelletizing, comprise the steps:
1), prepare steel mill's dedusting ash or steel mill's mud, dedusting ash will be made steel with dry collection method and be received by sack cleaner
Collection, is transported to pelletizing workshop；Or dedusting ash will be made steel by a literary composition, the dehydration of two literary compositions, gravity dewatering apparatus, elbow with wet method collecting method
Device, wet rotation dehydrator bring sump into by converter turbid circulating water, enter back into sewage disposal device, after precipitation mud are transported to pelletizing
Workshop；
2), according to mass ratio be steel mill's dedusting ash and/or steel mill's mud 80%, the ratio of iron scale 17%, bentonite 3%
Example weighs raw material mix homogeneously；
3), said mixture is finely tuned and make pelletizing through pressure ball molding after water；In mixture after calling in minor amount of water, moisture contains
Amount accounts for the 15% of mixture gross mass；Adopt two lower-powered ball presses during pressure ball molding, be first used for precompressed using one,
Reuse other one for pressure ball molding；
4), above-mentioned prepared pelletizing is sent in airtight still kettle, directly lead to steam and steam-cured heating is carried out to pelletizing, make
There is steam-cured reaction in it, steam-cured medium is vapor, and steam-cured pressure is 0.8mpa, and steam temperature is 170 DEG C, the steam-cured time 40
Minute；
5), by above-mentioned steam-cured after product carry out dust separation screening, finally obtain finished product.
The pellet strength of prepared cooling pelletizing is 50kg/cm to the maximum2.
Embodiment 3
A kind of use steel mill dedusting ash or steel mill's mud make the method cooling down slag making pelletizing, comprise the steps:
1), prepare steel mill's dedusting ash or steel mill's mud, dedusting ash will be made steel with dry collection method and be received by sack cleaner
Collection, is transported to pelletizing workshop；Or dedusting ash will be made steel by a literary composition, the dehydration of two literary compositions, gravity dewatering apparatus, elbow with wet method collecting method
Device, wet rotation dehydrator bring sump into by converter turbid circulating water, enter back into sewage disposal device, after precipitation mud are transported to pelletizing
Workshop；
2), according to mass ratio be steel mill's dedusting ash and/or steel mill's mud 84%, the ratio of iron scale 10%, bentonite 6%
Example weighs raw material mix homogeneously；
3), said mixture is finely tuned and make pelletizing through pressure ball molding after water；In mixture after calling in minor amount of water, moisture contains
Amount accounts for the 20% of mixture gross mass；Adopt two lower-powered ball presses during pressure ball molding, be first used for precompressed using one,
Reuse other one for pressure ball molding；
4), above-mentioned prepared pelletizing is sent in airtight still kettle, directly lead to steam and steam-cured heating is carried out to pelletizing, make
There is steam-cured reaction in it, steam-cured medium is vapor, and steam-cured pressure is 1.4mpa, and steam temperature is 195 DEG C, the steam-cured time 30
Minute；
5), by above-mentioned steam-cured after product carry out dust separation screening, finally obtain finished product.
The pellet strength of prepared cooling pelletizing is 65kg/cm to the maximum2.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
The change or replacement expected without creative work, all should be included within the scope of the present invention.Therefore, the present invention
Protection domain should be defined by the protection domain that claims are limited.
Claims (5)
1. a kind of use steel mill dedusting ash or steel mill's mud make the method for cooling slag making pelletizing it is characterised in that including following walking
Rapid:
1), steel mill's dedusting ash or steel mill's mud are prepared；
2), according to mass ratio be steel mill's dedusting ash and/or steel mill's mud 75～85%, iron scale 10～20%, bentonite 2～
15% ratio weighs raw material mix homogeneously；
3), said mixture is finely tuned and make pelletizing through pressure ball molding after water, during pressure ball molding, using two lower-powered pressures
Ball machine, is first used for precompressed using one, reuses other one for pressure ball molding；
4), above-mentioned prepared pelletizing is sent in airtight still kettle, directly lead to steam and pelletizing is carried out with steam-cured heating so as to send out
Raw steam-cured reaction, steam-cured medium is vapor, and steam-cured pressure is 0.05～1.4mpa, and steam temperature is 105 DEG C～195 DEG C,
Steam-cured time 0.5～2h；
5), by above-mentioned steam-cured after product carry out dust separation screening, finally obtain finished product.
2. use steel mill dedusting ash according to claim 1 or steel mill's mud make the method cooling down slag making pelletizing, its feature
It is, described step 1) in, prepare steel mill's dedusting ash or steel mill's mud, the method preparing steel mill's dedusting ash is: uses dry collection
Method will be made steel dedusting ash and be collected by sack cleaner, be transported to pelletizing workshop；The method preparing steel mill's mud is: is collected with wet method
Method is brought into making steel dedusting ash by converter turbid circulating water by a literary composition, two literary compositions, gravity dewatering apparatus, elbow separator, wet rotation dehydrator
Sump, enters back into sewage disposal device, after precipitation mud is transported to pelletizing workshop.
3. use steel mill dedusting ash according to claim 1 or steel mill's mud make the method cooling down slag making pelletizing, its feature
Be, described step 2) described in bentonitic mass ratio be 3～6%.
4. use steel mill dedusting ash according to claim 1 or steel mill's mud make the method cooling down slag making pelletizing, its feature
Be, described step 3) in call in minor amount of water after in mixture moisture account for the 1～20% of mixture gross mass.
5. a kind of for realizing described in claim 1 with what steel mill's dedusting ash or steel mill mud made cooling slag making pelletizing method being
System it is characterised in that comprise to set gradually proportioner, mixing arrangement, ball press system, still kettle system, screening plant,
Blanking device；Described proportioner is used for for raw material entering mixing arrangement from proportioner；Described mixing arrangement is used for raw material
Mix homogeneously, described ball press system is used for the raw material of mix homogeneously being carried out pressure ball molding, then by pressure ball molding gained ball
Group sends into still kettle system and carries out steam-cured, and described ball press system comprises two lower-powered ball presses, and wherein one is used for
Precompressed, in addition one is used for pressure ball molding, and described screening plant is used for carrying out dust screening to the pelletizing after steam-cured；Described mixing
Device contains priming apparatus, for the material fine setting water entering mixing arrangement.
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| CN201410543047.2A CN104372170B (en) | 2014-10-14 | 2014-10-14 | Method and system for manufacturing cooled slag-making pellets from steel plant dedusting ash or steel plant sludge |
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| CN104694745A (en) * | 2015-03-06 | 2015-06-10 | 江苏永钢集团有限公司 | Preparation method of pellets for blast furnace smelting |
| CN106929625A (en) * | 2015-12-29 | 2017-07-07 | 林士凯 | The sludge that steel mill is produced is reclaimed and is made as the method that steel mill produces auxiliary material again |
| CN108103308B (en) * | 2016-11-25 | 2019-10-18 | 上海梅山钢铁股份有限公司 | A kind of device and method for steel-smelting sewage sludge pelletizing |
| CN106702154B (en) * | 2016-11-30 | 2019-08-20 | 振石集团东方特钢有限公司 | A kind of method of stainless steel solid waste pelletizing production |
| CN114875236A (en) * | 2022-05-17 | 2022-08-09 | 新源县渣宝环保技术有限公司 | Method for producing high-strength pellets by using steel slag fine powder |
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| WO2004050924A1 (en) * | 2002-12-02 | 2004-06-17 | Council Of Scientific And Industrial Research | Cold briquetting and pelletisation of mineral fines using an iron-bearing hydraulic binder |
| CN101270410A (en) * | 2007-03-20 | 2008-09-24 | 尚国洪 | Cold bonded pellet and method of producing the same |
| CN102925675B (en) * | 2011-07-27 | 2014-04-30 | 宝钢集团有限公司 | Method for recovering sludge from smelting ironmaking |
| CN102851418A (en) * | 2012-09-07 | 2013-01-02 | 中冶南方工程技术有限公司 | Method for cold consolidation briquetting and briquette blast furnace coking-free smelting |
| CN103320607B (en) * | 2013-07-05 | 2016-01-13 | 首钢京唐钢铁联合有限责任公司 | A kind of cold-consolidated ball and preparation method thereof |
| CN104109755B (en) * | 2014-07-30 | 2016-04-20 | 中冶南方工程技术有限公司 | A kind of dedusting ash is colded pressing metal pelletizing production system and method |
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