CN87102197A - The novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker - Google Patents
The novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker Download PDFInfo
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- CN87102197A CN87102197A CN198787102197A CN87102197A CN87102197A CN 87102197 A CN87102197 A CN 87102197A CN 198787102197 A CN198787102197 A CN 198787102197A CN 87102197 A CN87102197 A CN 87102197A CN 87102197 A CN87102197 A CN 87102197A
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker belongs to a kind of preparation method of material of construction.It is with the mixing of blast furnace gas and heated and pressurized air after the pressurization and burns into 1500～1600 ℃ flue gas, and newly adds powder stock generation uniform mixing.Produce the silicate chemistry reaction simultaneously, gather in centrifugal gathering in the reactor then, and make reaction thoroughly generate the granular cement grog.
This novel process can make full use of blast-furnace slag, makes full use of slag heat energy and coal gas heat energy, produces the broad variety Portland clinker.
Description
The invention belongs to the preparation method of material of construction.
Producing cement with blast-furnace slag now is with the quenching of melted gangue water, granulation, and makes the vitreum grain slag, after the drying, as cement clinker with addition of material.General proportioning is 30～40%.
Use with addition of material method operating mine slag cement, the heat of melted gangue fails to utilize.Grain slag grinding current consumption is big, and efficient is low.And production grain slag water loss is big, and slag cement strength can only reach 400
#About, early age strength of concrete is low.
By chemical analysis to blast-furnace slag, the dry slag of foundry iron and conversion pig, calcium oxide wherein (CaO), silicon-dioxide (SiO
2), aluminium sesquioxide (Al
2O
3) and magnesium oxide (MgO) content account for more than 95 percent of total amount, ferric oxide (Fe
2O
3), the content of manganese oxide (MnO) and sulphur (S) generally is about one of percentage.The chemical constitution of silicate cement and the chemical constitution of blast-furnace slag are just the same, only the content difference.The blast-furnace slag composition of each big steel mill sees Table one.
The mineral composition of blast-furnace slag according to the scoriaceous lithofacies appraise of China's different components, owing to the content of silicon-dioxide in the slag and aluminium sesquioxide is more, generates more pseudowollastonite (α-2CaOSiO
2) and gehlenite (2CaOAi
2O
3SiO
2) and make slag mesosilicic acid dicalcium (2CaOSiO
2) growing amount significantly reduce, and can't generate tricalcium silicate (3CaOSiO
2)
In order to make full use of blast-furnace slag, make full use of the heat energy of fusion blast-furnace slag, designed a kind of novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker, produce the cement clinker that general utility value is arranged.
The present invention mixes with the heated and pressurized air that is loaded with high temperature powder raw material with the blast furnace gas after the pressurization, and burn into 1500～1600 ℃ of high temperature two-phase flow gases, jet from mixing effusive 1450～1500 ℃ of melted gangues of slag hearth with the flow velocity of 200～300m/S, it is nebulized, and solid powder raw material-calcium oxide (CaO), the ferric oxide (Fe vaporific with high temperature
2O
3), Calcium Fluoride (Fluorspan) (CaF
2) wait the uniform mixing that takes place under the turbulent flow attitude, the silicate chemistry reaction takes place simultaneously.Gather in centrifugal gathering in the reactor then, and control and prolong the reaction times, make reaction thoroughly, calcium oxide absorptions that be done generates the granular cement grog, and flue gas and grog separated.
The cement clinker technological process of production of the present invention such as accompanying drawing 1, processing unit is arranged as accompanying drawing 2.
High temperature molten blast furnace slag liquid is poured inlet (1) into, is flowed into the slag well (20) that the mixed slag hearth (2) that heating and insulation effect are arranged passes through the energy dominant discharge among Fig. 2, flow in the slag spraying gun (19), the two-phase flow of the compositions such as solid powder raw material-calcium oxide, ferric oxide and Calcium Fluoride (Fluorspan) that high temperature air and high temperature are vaporific enters the burning spout by transfer lime (16), with spray into from the front burning spout through being pressurized to 4～6Kg/Cm
2Blast furnace gas (not drawing in the equipment layout) in burning spout burning, eject 1500～1600 ℃ high-temperature gas, spray into spraying gun with the flow velocity of 200～300m/S, make ore deposit liquid atomizing, and with raw material powder generation uniform mixing.Mixed raw material, by reaction transfer lime (4), spray into the centrifugal reactor (5) that gathers with the flow velocity of 100～200m/S from tangential direction, gather in the reactor (5) centrifugal, on barrel, assemble rapidly because of centrifugal action makes the high temperature semi liquid state cement clinker of generation, and separate with flue gas.After cement clinker is isolated,, carry kiln (13) and enter rotation by the regular scraping of gravity and water-cooled scraper plate, and control and prolonged the reaction times.By the rotation that kiln is carried in the rotation that certain inclination angle is arranged, grog is transported to flow separator (14) and falls on the combined type castor formula cooler (15).This moment, calcium oxide was absorbed fully, generated the granular cement grog.Then through 4-6Kg/Cm
2Pressurized air cool off fast.Promote tricalcium silicate (3CaO, SiO
2) generation, increase the content of grog tricalcium silicate, by crusher (17) fragmentation, flow to the grog stockyard at last from (18).
Pressurized air and high temperature chamotte in combined type castor formula cooler (17) carry out heat exchange, make its temperature reach 750～850 ℃, high temperature compressed air enters in the hot air delivery pipe (16), converge mutually with effusive high temperature raw material powder bottom fourth stage whirlwind tube heat exchanger (7), form two-phase flow and be transported to the burning spout, arrive at last in the ore deposit liquid atomization device (19).
Centrifugally gather isolated high-temperature flue gas in the reactor (5), enter the hot-wind inlet of fourth stage whirlwind tube heat exchanger (7) from tangential direction by rotation conveying kiln (13), successively through (8), (9), (10) whirlwind tube at different levels heat exchanger, finish the heat exchange of raw material powder is discharged.
Iron ore, Wingdale, fluorite are through being ground into the powder below the 90 μ m, and be mixed by certain ratio of components, enter (10), (9), (8), (7) successively through limit material controller (11) in former feed bin (12), whirlwind tube heat exchangers at different levels are with high-temperature flue gas generation heat exchange.Raw material is heated to 750～850 ℃, enters hot air delivery pipe (16) in the bottom of fourth stage whirlwind tube heat exchanger (7), is transported in burning spout and the ore deposit liquid atomization device (19) by the high pressure-temperature air again.
The feed amount of each limit material controller, all available electron computer unified managements such as blast, wind-warm syndrome, air quantity constantly realize above each circulation, the continuous production cement clinker.The feed amount of limit material controller and air quantity synchronization control all can guarantee the ordinary production of technology in error 10 scopes.
Basic metal (Na in this processing requirement cement clinker
2Ok
2O) content is not more than magnesium oxide in 1.2% blast-furnace slag (MgO) content and is not more than 10%.
This processing requirement adopts corresponding measures for the prevention of explosion and security measures.
The design implementation scheme of main technique equipment of the present invention is described as follows:
This equipment design is to produce 450000 tons of iron per year, and the iron work of 1232 tons of blast-furnace slag liquid of daily output is design basis.
1, ore deposit liquid winding-up spraying gun:
It is by growing 2.4 meters, 0.45 meter of external diameter, the fire-resistant boiler weldless steel tube composition that internal diameter is 0.4 meter.Outer wall of steel pipe cools off with tank.The high-temperature flue gas that generates after the gas-fired, the two-phase flow with high temperature raw material powder is formed with the flow velocity of 279m/S, by the jet action of jet pipe, nebulizes the winding-up of fused blast-furnace slag, simultaneously with newly add raw material powder and mix, silicate chemistry takes place to react.Ore deposit liquid winding-up atomizer structure such as accompanying drawing 3:
2, reaction transfer lime
By 2.5 meters of external diameters, thick 10 millimeters steel pipe, 0.171 meter thick alumina firebrick of interior block and 0.23 meter thick light weight fireclay brick constitute, and it is 14 meters of vertical heights, and the oblique line that level is long 20 meters is arranged.And be provided with to give and stay logical grey hole, ash output opening and hand-hole.
The reaction transfer lime connects spraying gun and the centrifugal reactor that gathers, and the pyritous two-phase fluid enters in this pipe, and the intact coal gas of unburn burns away, and material spreads mixing in high-speed motion, in high velocity impact and produce silicate chemistry reaction, convey materials simultaneously.This moment, the fluid medial temperature was 1400～1500 ℃, and transported fluid into the centrifugal reactor that gathers with the mean flow rate of 38m/S.
3, the centrifugal reactor that gathers:
By high 7 meters, 2.5 meters thick steel cylinders of 10 millimeters of external diameter are formed, build in the tube 0.171 meter thick alumina firebrick and 0.23 meter thick light weight fireclay brick are arranged, two-phase fluid in the autoreaction transfer lime, speed with 150m/S sprays into the centrifugal reactor that gathers from tangential direction, utilize scoriaceous cohesiveness of high temperature and centrifugal action, cement clinker is assembled on barrel rapidly, and flue gas and grog are separated.Because the tight contact of storeroom and control certain residence time, calcium oxide is thoroughly absorbed, and silicate reaction is thorough.For the sticking in a large number wall of anti-grog, be provided with steel water-cooled garden scraper plate in the centrifugal reactor head of gathering, regularly scrape the material on the barrel.
4, heat exchanger:
Category Four cyclone tube heat exchanger and combined type castor formula cooler are selected national standard equipment for use.
5, air-pressure equipment:
By 1725 tons of the ripe pugs of this production technique daily output water, per second produces 19.96 kilograms in grog.Then needing pressure is 4-6kg/Cm
2Flow is 10.94NM
3The air of/S and pressure are 4～6kg/Cm
2, flow is 12.87NM
3The blast furnace gas of/S is selected corresponding air, gas compressor for use according to pressure and flow.
6, fragmentation, screening and mixing equipment
Select corresponding raw material crushing machine, ball mill and screening mixing equipment for use, cement clinker ball mill and screening plant.
The advantage of this novel process:
1, this novel process is under 1450～1600 ℃ high temperature, and working procedures (ore deposit liquid atomizing, batch mixing, sinterable silicon hydrochlorate, flue gas separate) is all finished in multi-form pipeline simultaneously, so compact equipment is simple, reliable.
2, the chemical reaction of this novel process from start to finish all takes place in liquid phase, initial reaction is to carry out in 50% blast-furnace slag liquid is arranged, and the reaction of Dicalcium Phosphate (Feed Grade) and calcium oxide is to take place in 39.36% amount of liquid phase is arranged, and calcium oxide is constantly absorbed, and the tricalcium silicate crystal is constantly separated out.Because the existence of amount of liquid phase, and accelerate the formation speed of tricalcium silicate greatly.
3, the novel process raw material does not have the process of heating gradually, after raw materials such as calcium oxide, ferric oxide, Calcium Fluoride (Fluorspan) give heat by heat exchanger, be warmed to 1500～1600 ℃ at burning spout moment (a few tens of milliseconds), and with flue gas, 1450～1500 ℃ the blast-furnace slag liquid of jetting immediately, make it form particulate, and mix mutually, react simultaneously, avoid calcium oxide to burn till dying embers, increase the textural defect of reactant, helped the generation of silicate.
4, be easy to adopt control type, calculation type, robot calculator, be easy to control and technology for detection automatically, further guarantee quality product, easily change the cement clinker product type fast.
5, can make full use of industrial waste, make full use of the depleted energy.Because of high-temperature liquid state winding-up is pulverized slag and high temperature batch mixing, conveying, chemical reaction can carry out simultaneously in sealing-duct.Therefore further reduce energy consumption of unit product, water consumption and raw material consumption again, and reduce pollution environment.
6, the chemical reaction that is produced from spraying gun to centrifugal accumulator belongs to thermopositive reaction.1 kilogram of grog of every production is emitted 51.84 kilocalories of heat.And calcium ferrite (CaOFe
2O
3) in the time of 1450 ℃, absorb a large amount of heat of liquefactions, can guarantee effectively that therefore whole process constant temperature produces under 1450 ℃ condition.
Economical effectiveness:
Produce 500000 tons of pig iron per year with the water steel and calculate, iron per ton produces 700 kilograms of the quantity of slag, and blast furnace is produced 350000 tons of slags per year, and 1,400 hundred million kilocalories of recyclable heat energy are equivalent to the heat that 20,000 tons of standard coal burnings produce.Whole nation smelter was produced about 2,500 ten thousand tons of blast-furnace slags per year in 84 years, adopted this technology can convert thereof into 5,000 ten thousand tons of cement clinkers.Produce more than 6,000 ten thousand tons of cement, the output value reaches 6,100,000,000 yuan.At present conventional production process needs 0.236 ton of calculating of standard coal by cement clinker per ton, then can save 1,180 ten thousand tons of standard coals with this novel process, by 25 yuan of standard coals per ton, capable of saving fuelly takes 2.95 hundred million yuan.Save 3,300 ten thousand yuan of cement raw material and various transport charges.Greatly reduce the manufacture of cement cost.Because blast-furnace slag belongs to industrial waste, dry residue emission need take big time soil, takies a large amount of human and material resources, and therefore, this technology is protected soil to the protection face of land, and protection is biological, and great realistic meaning is all arranged.
Embodiment 1
With this explained hereafter portland cement clinker
1, selects the chemical constitution of raw material for use
| Material name | SiO 2 | Fe 2O 3 | AI 2O 3 | CaO | MgO | Loss on ignition |
| Wingdale | 4.02 | 0.5 | 1.1 | 52.18 | 0.87 | 40.62 |
| Ferriferous raw material | 17.5 | 47.14 | 3.48 | 14.6 | 3.91 | 10.49 |
| Water steel slag | 30.5 | 0.8 | 13.76 | 42.89 | 4.48 | 6.5 |
2, as calculated, the dried feed weight ratio is selected for use:
Coal stone=57.2% ferriferous raw material=4.1%
Blast-furnace slag=38.7%
3, product grog chemical constitution is:
SiO
2＝20% AI
2O
3＝8.24% CaO＝54.49%
Fe
2O＝3.43% MgO＝3.23%
4, each rate value of cement clinker is:
KH＝0.94 n＝2.5 p＝2.4
5, known water steel slag output is 9.8Kg/S, then newly adds the required flow of raw material to be:
Wingdale=14.57Kg/S
Ferriferous raw material=1.04Kg/S
6, this technology is produced 580000 tons of cement clinkers per year.
With this explained hereafter cement for dam grog
1, select for use the chemical constitution of raw material with embodiment 1
2, the dried feed weight ratio is selected for use as calculated:
Wingdale=57.0% ferriferous raw material=11.51%
Blast-furnace slag=31.5%
3, then the chemical constitution of product grog is:
SiO
2＝19.17% AI
2O
3＝7.41% CaO＝60.94%
Fe
2O
3＝8.1% MgO＝3.23%
4, the mineral composition of cement for dam grog is:
C
3S＝40.95% C
2S＝24.02% C
3A＝5.89%
C
4AF＝24.63% C
2F＝6%
5, each rate value of cement clinker is:
KH＝0.855 n＝1.24 p＝0.91
6, known water steel slag output is 9.8Kg/S, and calculating newly adds the required flow of raw material and is:
Wingdale=17.77Kg/S
Ferriferous raw material=3.6Kg/S
7, the annual production of cement for dam grog is 690,000 tons.
With this explained hereafter white portland cement clinker
1, selects the chemical constitution of raw material for use
| Material name | SiO 2 | AI 2O 3 | Fe 2O 3 | CaO | MgO | Loss on ignition |
| Wingdale | 1.38 | 0.25 | 0.09 | 54.23 | 0.6 | 42.81 |
| Ferriferous raw material | 91.02 | 0.2 | 0.6 | 0.75 | 0.9 | 0.53 |
| Water steel slag | 30.5 | 13.76 | 0.8 | 42.89 | 4.48 | 6.502 |
2, as calculated, the dried feed weight ratio is selected for use:
The siliceous white clay of Wingdale=63.2%=5.6% blast-furnace slag=31%
3, then the chemical constitution of product grog is:
SiO
2＝21.87% AI
2O
3＝6.75% CaO＝67.21%
Fe
2O
3＝0.48% MgO＝2.52%
4, calculate each rate value of cement clinker:
KH＝0.912 n＝3.0 p＝14.12
5, known water steel slag output is 9.8Kg/S, and calculating newly adds the required flow of raw material and is:
Wingdale=19.97Kg/S
Siliceous white clay=1.77Kg/S
6, the annual production of white cement grog is 690,000 tons.
Subordinate list 1
Claims (10)
1, the novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker, it comprises pulverizing and the mixing system that newly adds raw material, the heat exchange system of air and high temperature chamotte, the heat exchange system of high-temperature flue gas and raw material powder, the separation system of high-temperature flue gas and high temperature chamotte.It is characterized in that with blast furnace gas after the pressurization and the burning of the air mixed after the pressurized, heated, produce flue gas, form and the kinetic energy high temperature two-phase flow that newly adds raw material powder composition, direct winding-up molten blast furnace slag, make it become liquid vaporific, solid powder raw material under the turbulent flow attitude with vaporific slag uniform mixing, and the silicate chemistry reaction takes place.Gather in centrifugal gathering in the reactor then, flue gas is separated with grog, and control and prolongation reaction times, make silicate reaction thorough, generate cement clinker.
2, by the described novel process of claim (1), it is characterized in that slag pulverizes the uniform mixing of atomizing and high-temp solid powder raw material, and the silicate chemistry reaction takes place, be by spraying gun, the reaction transfer lime carried out in the reactor until centrifugal gathering.
3, by the described novel process of claim (1), it is characterized in that blast furnace gas is pressurized to 4～6kg/Cm
2Air pressurized to 4～6kg/Cm
2, and the wind-warm syndrome after the heat exchange is 750～850 ℃.
4, by the described novel process of claim (1), it is characterized in that newly adding raw material through being ground into the solid particulate below the 90 μ m, and abundant mixing.Through whirlwind tube heat exchanger heats, temperature reaches 750～850 ℃.
5, by the described novel process of claim (1), it is characterized in that molten blast furnace slag temperature is 1450～1500 ℃, and in mixing slag hearth, store, enter the winding-up pipe through the slag well.
By the described novel process of claim (1), it is characterized in that 6, the two-phase flow temperature that the burning of coal gas is formed flue gas and coal gas is instantaneous to reach 1500～1600 ℃.
7, by claim (1), (2) described novel process, spraying gun is made up of the taper heat resisting pipe, and outer wall adopts the cooling of tank flowing water.
8, by claim (1), (2) described novel process, it is characterized in that, the pipeline of transferring raw material, the reaction transport pipe, the centrifugal reactor that gathers is steel garden tube, the thermal insulation fire-resistant material that interior block is different.
9, by claim (1), (2) described novel process, it is characterized in that centrifugal accumulator top is provided with internal recycle water cooling garden rubbing board, by regular moving up and down, and the grog on the scraping accumulator inwall is transported in the castor formula composite cooler it.
10, by the described novel process of claim (1), it is characterized in that two-phase flow is 200～300m/s to the injecting velocity of ore deposit liquid, the weight ratio of flue gas consumption and cement clinker output is 1.3～2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198787102197A CN87102197A (en) | 1987-03-18 | 1987-03-18 | The novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN198787102197A CN87102197A (en) | 1987-03-18 | 1987-03-18 | The novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87102197A true CN87102197A (en) | 1988-11-02 |
Family
ID=4813859
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|---|---|---|---|
| CN198787102197A Pending CN87102197A (en) | 1987-03-18 | 1987-03-18 | The novel process of fechnology for direct conversion of blast furnace melting slag into cement clinker |
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|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195521B (en) * | 2007-12-19 | 2010-09-15 | 莱芜钢铁集团有限公司 | Method for producing margin coal gas by using steel in rotary cement kiln predecomposition furnace |
| CN102950057A (en) * | 2012-11-28 | 2013-03-06 | 四川省川威集团有限公司 | Continuous converting method for mutually converting clinker and slag powder |
| CN103201231A (en) * | 2010-11-10 | 2013-07-10 | 易高麦斯特株式会社 | Ultra-rapidly hardening hydraulic binder using reducing slag powders, and method for preparing same |
| CN104197730A (en) * | 2014-09-05 | 2014-12-10 | 秦冶工程技术(北京)有限责任公司 | Sintering exhaust gas waste heat recycling system and method |
| CN104232819A (en) * | 2013-06-20 | 2014-12-24 | 山东建筑大学 | Granulating device and method of liquid steel slag or liquid iron slag |
| CN107586900A (en) * | 2017-08-22 | 2018-01-16 | 上海驰春节能科技有限公司 | A kind of method and device of spray-granulated molten blast furnace slag |
| CN107674929A (en) * | 2017-08-22 | 2018-02-09 | 上海驰春节能科技有限公司 | A kind of fused solution slag particle and the method and its system and device of heat exchange |
| WO2020206834A1 (en) * | 2019-04-11 | 2020-10-15 | 东北大学 | Method for directly cementing molten blast furnace slag |
-
1987
- 1987-03-18 CN CN198787102197A patent/CN87102197A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101195521B (en) * | 2007-12-19 | 2010-09-15 | 莱芜钢铁集团有限公司 | Method for producing margin coal gas by using steel in rotary cement kiln predecomposition furnace |
| CN103201231A (en) * | 2010-11-10 | 2013-07-10 | 易高麦斯特株式会社 | Ultra-rapidly hardening hydraulic binder using reducing slag powders, and method for preparing same |
| CN103201231B (en) * | 2010-11-10 | 2015-12-02 | 易高麦斯特株式会社 | Utilize the rigid bond material of ultrafast petrifying water and the manufacture method thereof of reducing slag powder |
| CN102950057A (en) * | 2012-11-28 | 2013-03-06 | 四川省川威集团有限公司 | Continuous converting method for mutually converting clinker and slag powder |
| CN104232819A (en) * | 2013-06-20 | 2014-12-24 | 山东建筑大学 | Granulating device and method of liquid steel slag or liquid iron slag |
| CN104197730A (en) * | 2014-09-05 | 2014-12-10 | 秦冶工程技术(北京)有限责任公司 | Sintering exhaust gas waste heat recycling system and method |
| CN104197730B (en) * | 2014-09-05 | 2016-03-02 | 秦冶工程技术(北京)有限责任公司 | A kind of sintered discharge gas waste heat recycling system and method |
| CN107586900A (en) * | 2017-08-22 | 2018-01-16 | 上海驰春节能科技有限公司 | A kind of method and device of spray-granulated molten blast furnace slag |
| CN107674929A (en) * | 2017-08-22 | 2018-02-09 | 上海驰春节能科技有限公司 | A kind of fused solution slag particle and the method and its system and device of heat exchange |
| CN107586900B (en) * | 2017-08-22 | 2019-03-29 | 上海驰春节能科技有限公司 | A kind of method and device of spray-granulated molten blast furnace slag |
| CN107674929B (en) * | 2017-08-22 | 2019-04-30 | 上海驰春节能科技有限公司 | A kind of fused solution slag particle and the method and its system and device of heat exchange |
| WO2020206834A1 (en) * | 2019-04-11 | 2020-10-15 | 东北大学 | Method for directly cementing molten blast furnace slag |
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