CN1271221C - Method for producing ferrum products using low temperature reduction of iron ore powder - Google Patents
Method for producing ferrum products using low temperature reduction of iron ore powder Download PDFInfo
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- CN1271221C CN1271221C CN 200410000815 CN200410000815A CN1271221C CN 1271221 C CN1271221 C CN 1271221C CN 200410000815 CN200410000815 CN 200410000815 CN 200410000815 A CN200410000815 A CN 200410000815A CN 1271221 C CN1271221 C CN 1271221C
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Abstract
The present invention is more suitable for adopting a preparation method for rapidly reducing iron ore powder at low temperature to produce the products of iron melt and sponge iron, which belongs to the field of a preparation method of metallurgical reduction iron. The preparation method comprises the concrete flow that after iron ore concentrates, coal and a catalyst and a desulfurizing agent which are added are adopted to be crushed in a ball mill, a binding agent is added for mixed pelletization. The present invention is characterized in that the granularity of material powder used for pelletization is from 2 to 80 mum, the material powder comprises the ingredients of (by weight percentage) 82 to 98% of mineral powder and coal dust, 1 to 10% of binding agent, 0.1 to 5% of catalyst and at most 3% of desulfurizing agent. The reduction reaction temperature is from 500 to 1100 DEG C, and the reduction reaction time is from 10 to 200 minutes. Compared with the prior art, the method of the present invention has the characteristics of high production efficiency, rapid reduction reaction speed, simple preparation process, low energy consumption and high environmental protection.
Description
Technical field
The invention belongs to the preparation method field of metallurgical reduction iron production.Be more suitable for adopting quick low-temperature reduction powdered iron ore to produce the method for molten iron and sponge iron.
Background technology
As everyone knows, adopting blast furnace iron-making process is the main ironmaking flow process of modern steel industry, and this method mainly includes technological process parts such as coking, sintering (pelletizing), blast-furnace body, hot blast, coal powder injection and forms.Though the blast furnace iron-making process flow process is complicated, energy consumption is high, defectives such as pollute and cost of investment is big are arranged, and remains the main flow process of countries nowadays iron-smelting process at present.Therefore people also attempt to develop the preparation method of various non-blast furnace ironmaking, to replace blast furnace iron-making process.In the various direct method of reducing that develops at present, though coal-based rotary kiln technology is not used coking coal because its reduction rate too slow (about 1000 ℃ of charge-temperature, 10h), the too low (0.4t/m of production efficiency
3Day), energy consumption 13.4GJ/t.The energy consumption of the coal-based shaft furnace of external-heat is 14.6GJ/t.Convert sponge iron to molten iron if consider, the method energy consumption of various coal-based direct reductions all will be above the energy consumption (total energy consumption of blast furnace ironmaking is about 13.8GJ/t) of blast furnace iron-making method, and the production efficiency of blast furnace ironmaking is again apparently higher than the method for various coal-based direct reductions still more.So present coal-based direct reduction technology also can't be compared with blast furnace iron-making method.Adopt the production method of gas base directly reducing in addition in addition, its energy consumption is about 10.7GJ/t, though this production method energy consumption a little less than blast furnace iron-making process, the needed amount of natural gas of this method is about 300m
3/ t, and Sweet natural gas is with CH
4In hydrocarbon polymer is main, need change into CO and H
2Be master's reducing gas, price own is all higher with the conversion cost, has the natural gas reservoir amount of China also less again, the also very difficult technology that the Sweet natural gas of costliness is used for producing iron product of therefore just present China.In the various smelting reduction process that China developed, the COREX method is the processing method of rare input suitability for industrialized production, but its process energy consumption is too high, reaches 23GJ/t, the environmental pollution that causes simultaneously is more serious, and the tail gas that contains CO in a large number that produces still needs to carry out the extra comprehensive regulation and utilization.
Summary of the invention
The objective of the invention is to propose a kind of production efficiency height, reduction reaction speed is fast, preparation technology simple, less energy-consumption and high environmental protection, and also has the method for the low-temperature reduction powdered iron ore production sponge iron that fixed investment is few and production cost is low.
The method of producing sponge iron according to the low-temperature reduction powdered iron ore that the object of the invention proposed is compared with the prior art analysis as can be seen, no matter is direct method of reducing or melting reduction method, and its production efficiency and energy consumption are all less than existing blast furnace production method.In order to develop the coal-based direct reduction ironmaking technology that is fit to China's national situation, what need solution is the speed of response that how to improve coal-based direct reduction, improves energy utilization efficiency, reduces the energy consumption in the production process.Know that from the iron-smelting process flow process of prior art the energy expenditure of ironmaking approximately can resolve into 5 parts: the physics heat of (1) material; (2) reaction heat dissipation; (3) thermosteresis of tail gas; (4) heat radiation; (5) energy consumption that is connected of each equipment etc.The effective way that cuts down the consumption of energy is at first to avoid occurring the heating that repeats of material, as agglomerate in the blast furnace iron-making process and coke.It two should be enhanced productivity, and reduces unnecessary heat lost by radiation.It three is exactly to reduce reduction temperature, not only can reduce the physics heat of material, also can reduce the thermosteresis and the heat lost by radiation of waste gas.Therefore low-temperature reduction powdered iron ore proposed by the invention is produced the method for sponge iron, and its purpose is to solve and changes traditional coal-based direct reduction and gas base directly reducing and produces sponge iron " slow at 800 ℃ of-1100 ℃ of reduction rates " this hampers the difficult problem of ironmaking technology development for a long time.Show according to the result that we studied: adopt efficient ball mill that materials such as iron ore are processed the resulting superfine powder in back and have high activation performance, the granularity of powdered iron ore and coal dust body is thin more, and reactivity is then high more.Reduction reaction meeting good low-temperature effect between activatory powdered iron ore and the coal dust: promptly carbon dust can obtain iron product with regard to reducible powdered iron ore about 500 ℃.Traditional metallurgical thermodynamics viewpoint thinks, the iron ore reduction activation temperature is to obtain iron product just might reacting more than 710 ℃; Cryogenic effect not only appears in the thermodynamics, also appear in the reduction kinetics, traditional coal-based solid state reduction theory is thought, only be higher than 1200 ℃ in temperature of reaction, speed of response just may obviously accelerate, and the iron method of reducing that the inventive method will propose, its activatory powdered iron ore and coal dust can be 600 ℃ of preparation methods that realize fast restore.Consider that powder is thin more, the cost of required preparation powder is just high more, and from reducing the cost purpose of the inventive method, we are controlled at 2-80 μ m with the granularity of powdered iron ore and coal dust.We show further that by the result who researchs and analyses and test the realization degree of metalization is 93% sponge iron, at 900 ℃ of reduction 60min, can realize that degree of metalization is the sponge iron more than 90%: the powdered iron ore, coal dust and the catalyzer that account for more than 90% of selecting for use granularity to be about 40 μ m are only used 10min 1100 ℃ of reduction, can obtain the high sponge iron of degree of metalization.Thereby realized the fast restore of iron ore.Moreover, we are reduced to temperature of reaction below 900 ℃, even low to 500 ℃, also can obtain the higher sponge iron of degree of metalization in 180min.Therefore adopt the inventive method far below existing metallurgical temperature range of smelting iron.
Produce the method for sponge iron according to the low-temperature reduction powdered iron ore that the object of the invention proposed, state in above content with us the inventive method, therefore our the method idiographic flow of designed low temperature fast restore powdered iron ore production sponge iron is, adopt iron ore concentrate, coal dust and the catalyzer that is added, sweetening agent in ball mill, to carry out adding binding agent again after fragmentation is processed and carry out mixed pelletizing, in heating installation, reduce after the pelletizing drying and obtain sponge iron.The granularity that it is characterized in that making the raw materials used powder of ball is 2-80 μ m, and the batch mixing weight ratio of powdered iron ore and coal dust is 1 in making the raw materials used powder of ball: 0.2-0.4, the catalyzer in the reduction powder is for containing Li
+, Na
+, K
+, Ca
2+, Sr
2+, Ba
2+Or Mg
2+In any one compound; Sweetening agent in the reduction powder is any one in rhombspar, unslaked lime, the Wingdale; Binding agent is meant in water glass, clay, the bentonite any one in the reducing material powder; Gross weight with the reduction powder is a benchmark, the adding weight % of powdered iron ore, coal dust is: 82-98%, binding agent adds weight %: 1-10%, catalyzer adds weight %: 0.1-5%, the adding weight % of sweetening agent is≤3%, and the gross weight % of powdered iron ore, coal dust, catalyzer, binding agent and sweetening agent is 100%; Reduction reaction temperature is 500-1100 ℃, and the reduction reaction time is 10-200 minute.Other features of the inventive method also have granularity be the powder of 2-40 μ m account for reduction powder gross weight 90%.Binding agent in this reduction powder be by water glass, clay, bentonite in combination more than any one.Catalyzer in the reduction powder is for containing Li
+, Na
+, K
+, Ca
2+, Sr
2+, Ba
2+Or Mg
2+Compound in any two or more combination.
Adopt low temperature fast restore method of the present invention because the priming reaction temperature is lower, therefore this method is less demanding to the reduction equipment used, all can use as equipment such as shaft furnace, tunnel furnace, rotary kiln, tube furnaces, meet the service requirements of the inventive method as long as equipment adjusted to slightly.Type of heating all is feasible as outer heating, internal heating.In the methods of the invention, catalyzer is the material of alkali metal containing ion or alkaline-earth metal ions, as all containing Ca in unslaked lime, Wingdale, the rhombspar
2+Ion, and contain Mg in the rhombspar, wagnerite
2+Ion has a variety of by that analogy.So in the methods of the invention selecting catalyst can be wherein any one or several be used in combination.Binding agent is to select for use to make ball or briquetting binding agent commonly used equally.In each flow process of the present invention, if adopt portion C O or H
2Reduce, its effect can be better.
The technical process of production method of the present invention is similar to existing method, and is comprehensively as follows:
The first step: with ball mill raw materials such as powdered iron ore, coal dust, sweetening agent, catalyzer are milled down to and set the binding agent that adds 1-10% after the granularity;
Second step: with raw material blending;
The 3rd step: pressure ball or agglomeration;
The 4th step: pelletizing or agglomeration are carried out drying;
The 5th step: in heating installation, adopt the inventive method to reduce processing then;
The 6th step: sponge iron is smelted into molten iron in high temperature service or sorting is carried out in sponge iron cooling back in magnetic plant.
On this basis, we have designed three kinds of technical process.Flow process one: (binding agent can be selected any one or several combination in the binding agents such as water glass, clay, bentonite with powdered iron ore, coal dust, binding agent, the content of binding agent be less than pelletizing weight 10%) and catalyzer (alkalimetal ion and/or alkaline-earth metal ions, its content for less than pelletizing weight 5%) mix and make pelletizing or bulk (granularity of powdered iron ore and coal dust is accounting for more than 90% of 40 μ m), after the drying pellet is reduced in heating installation, reduction temperature is 1000 ℃, and the recovery time is 100min.The high-temperature sponge iron that restores is imported in the smelting furnace, adopt electrically heated that it is melted, in the sponge iron melting process, also can adopt oxygen blast to flux.
Reduction temperature in this flow process and traditional directly also original production sponge iron temperature is close, but reduction rate can be traditional directly also about 10 times of the reduction rate of original production sponge iron.The total energy consumption of this method is less than 10GJ, and coal consumption is about the 400-750kg/ molten iron, the about 150kWh-400kWh of power consumption.
Flow process two: (binding agent can be selected any one or several combination in the binding agents such as water glass, clay, bentonite with powdered iron ore, coal dust, binding agent, the content of binding agent is less than 10% of pelletizing weight) and catalyzer (alkalimetal ion and/or alkaline-earth metal ions, its content less than for pelletizing weight 5%) mix and make pelletizing or bulk (granularity of powdered iron ore and coal dust is accounting for more than 90% of 40 μ m), pellet carries out the drying back and reduces in heating installation, reduction temperature is 950 ℃, recovery time 120min.With the high-temperature sponge iron cooling that restores, in magnetic plant, separate impurity such as gangue then.
With the difference of flow process one be the sponge iron cooling that high temperature is come out, carry out magnetic separation, the gangue in the iron powder (comprises SiO
2, Al
2O
3, FeO, CaO, MgO, calcium sulfate, sulfurated lime, phosphoric acid salt etc.) separation rate can be greater than 50%.This flow process adds sweetening agent, the sulphur in iron ore and the coal can be fixed into CaS or MgS, when magnetic separation part S is separated from sponge iron.Because temperature of reaction is low, phosphorus still exists with phosphatic form basically, go in the solid iron and be difficult to solid solution, so flow process two can also be separated part phosphorus from sponge iron.
The final degree of metalization of the sponge iron that flow process two is produced is about 92%, and gangue content is about 2-10%, and this depends on the Chemical Composition of iron ore concentrate and coal.Its energy consumption is less than 8GJ, and coal consumption is about the 400-700kg/ sponge iron.
Flow process three: (binding agent can be any one or several combination in the binding agents such as water glass, clay, bentonite with powdered iron ore, coal dust, binding agent, the gross weight of binding agent less than be pelletizing or lump ore weight 10%) and catalyzer (alkalimetal ion and/or alkaline-earth metal ions, consumption less than for pelletizing or lump ore weight 5%) mix and make pelletizing or bulk (granularity of powdered iron ore and coal dust be 40 μ m account for 90%), treat in reduction apparatus, to reduce after the pellet drying, reduction temperature is 750 ℃, and the recovery time is less than 150min.With the high-temperature sponge iron cooling that restores, in magnetic plant, separate impurity such as gangue then.
Can show the low temperature characteristics in the depth of the night of flow process, the thermal load of equipment material therefor is also minimum.Also corresponding declines such as the physics heat of material, the physics heat of tail gas, heat radiation, thereby energy consumption is also low.Under this temperature, sulphur is difficult to enter tail gas, NO with gasification attitude or SOx gas form such as (x=2,3)
xAlso be difficult to form, therefore be more conducive to environmental protection.
The final degree of metalization of the sponge iron that flow process three is produced is 92%, and gangue content is about 2-10%, and this depends on the Chemical Composition of iron ore concentrate and coal.Its energy consumption is less than 7GJ, and coal consumption is about the 300-600kg/ sponge iron.
Adopt method that low temperature fast restore powdered iron ore proposed by the invention produces sponge iron compared with prior art, have following characteristics:
(1), the production efficiency height, low temperature fast restore technology has realized quick production sponge iron and molten iron technology, reduction rate can be about 10 times of reduction rate of traditional sponge process for making iron, is higher than the reduction rate of blast furnace ironmaking and other non-blast furnace ironmaking technology.
(2), energy consumption is low, low temperature fast restore technology makes the energy consumptions such as physics heat, heat radiation of physics heat, waste gas of material descend, thereby has improved utilization efficiency of heat energy, so energy consumption is lower than blast furnace ironmaking and other non-blast furnace ironmaking technology.
(3), the environment-friendly type iron-smelting process, at first the inventive method is to adopt bituminous coal or hard coal as the main reductive agent of iron reductive, and does not need coking process, thereby topsoil is descended significantly; Its two because energy consumption is low, show that directly the consumption of coal will lack, thereby the total amount of elements such as C, S, N descends significantly also in the corresponding coal, because C finally is with CO in the energy consumption
2Therefore enter in the atmosphere, the CO that produced of iron-smelting process ton iron of the present invention
2Amount is also wanted corresponding other iron-smelting process that is lower than.Under identical condition, SO
2, NO
xThe quantity that produces also is lower than other iron-smelting process.In addition adopt low temperature technique of the present invention to make NO
x, SO
xBe difficult to form.So CO of the ironmaking technology ton iron generation of the present invention's proposition
2, SO
x, NO
xDeng the obnoxious flavour amount far below other iron-smelting process; Its three, the low temperature technique that the present invention proposes will descend the consumption of water significantly; At last, the iron-smelting process ton slag amount of the present invention's proposition also is lower than traditional ironmaking technology.Therefore, " environment-friendly type technique " is the important feature of the iron-smelting process that proposes of the present invention.
(4), can produce clean sponge iron because the iron-smelting process that the present invention proposes can effectively be removed impurity such as gangue, and harmful elements such as part that can be removed sulphur, phosphorus also simultaneously, obtain gangue, sulphur, sponge iron that phosphorus content is low, alleviate the post-order process burden.
(5), Production Flow Chart is simple, fixed investment is few, production cost is low owing to adopt the low-temperature reduction technology, Production Flow Chart is obviously simplified, blast furnace iron-making process needs main equipments such as sintering, coking, hot blast, blast-furnace body.And this technology only needs simple devices such as low-temperature heat equipment, separating device and Passivation Treatment.Adopt this method owing to do not need complicated cooling system, thereby reduced the cost that uses equipment.Since this method have production efficiency height, environmental protection, coal consumption low, do not use coke, simplified equipment, flow process short, characteristics such as refractory consumption rate is few make ton ferropexy investment and production cost be starkly lower than blast furnace ironmaking and other iron-smelting process.
Specific embodiments
Adopt the embodiment of production sponge iron process of the present invention in tube furnace and shaft furnace, to reduce simultaneous test.Contain T.Fe=65% in the powdered iron ore, make reductive agent (fixed carbon is 80% in the hard coal, and fixed carbon is 50% in the bituminous coal) with coal dust.Powdered iron ore and coal dust are compared test by granularity different.Catalyzer is selected CaO, CaCO for use
3, Na
2CO
3Deng; Binding agent is selected water glass and bentonite etc. for use, and temperature of reaction is elected 600 ℃ to 1050 ℃ as.Every comparative test result is listed in the table 1 in its technology.Comparing process flows is: adopt ball mill that raw materials such as powdered iron ore, coal dust, sweetening agent, catalyzer are milled down to and set the tackiness agent that adds set amount after the granularity, carry out pressure ball after again raw material being mixed and carry out drying treatment, in tube furnace, pelletizing is reduced processing then, in simultaneous test is fallen in the above-mentioned enforcement of the inventive method, the kind of selected powder particles and proportioning, catalyzer and binding agent and add-on, and pelletizing granularity, reduction reaction temperature and time and metallization recovery rate etc. are all listed in the table 1.Test number 1-12 is the embodiment of the invention in table 1, and 13,14, No. 15 is Comparative Examples.
As seen, the granularity of raw material powder is the most remarkable to the reducing property influence from simultaneous test table 1.0.04mm the reducing property of the powder of following (360 order) is good, and the powder reducing property that is higher than more than the 0.080mm is poor.0.05mm the reducing property of following (280 order) is between between them.It is more suitable that the granularity of therefore selected powder should be 0.04mm (360 orders should account for more than 90% of total powder amount), and the powder proportion of other granularity should be controlled at about 10%.
As seen from Table 1, catalyzer is bigger to the reducing property influence, and temperature of reaction is low more, can consider to add site catalyst, but considers the cost problem, and the catalyzer suggestion is controlled in 5%.
The influence of pelletizing granularity is to reducing influence and not very big itself, but this influences heat transfer efficiency and ventilation property, should be advisable at 5-60mm.
Binding agent has certain influence to reducing property, and suggestion is used and to be made ball binding agents such as water glass commonly used, and its add-on should be controlled within 10%, when content better effects if less than 5% time.
Any one is because they all have excellent desulfurizing effect as sweetening agent in selection unslaked lime, Wingdale, the rhombspar, but add-on should be controlled at below 3%.
In addition in embodiments of the present invention, sequence number the 6, the 15th adopts the comparison test of carrying out in tube furnace, and all the other all adopt and compare test in shaft furnace.
Table 2 is to be used in the prepared agglomerate pelletizing of the inventive method and prior art in fuel consumption, energy consumption, production efficiency, environmental protection and use the comparison of equipment cost, from this table 2, also can clearly see, being used in the inventive method produces, no matter be on production cost and environment protecting, still on the advantages of simple of technology, all have significantly superior and creative than prior art.
Table 1 is the contrast and experiment under each processing condition in the embodiment of the invention
| Test number | Powdered iron ore coal dust mean particle size | Raw meal particle size is than≤40 μ m% | Powdered iron ore/coal dust weight % | Catalyst type | The catalyzer add-on | The binding agent kind | The binding agent add-on | The sweetening agent add-on | The granularity of pelletizing | Temperature of reaction | Recovery time | Degree of metalization |
| 1 | 0.05mm | 90 | 1∶0.25A----96％ | Na 2CO 3 | 2％ | Water glass | 2％ | / | 10mm | 900℃ | 60 minutes | 85％ |
| 2 | 0.042mm | 92 | 1∶0.25A---97％ | Na 2CO 3 | 1％ | Water glass | 2％ | / | 10mm | 900℃ | 60 minutes | 90％ |
| 3 | 0.046mm | 90 | 1∶0.23A-93.5％ | Na 2CO 3 | 1.5％ | Water glass | 5％ | CaCO 32％ | 20mm | 950℃ | 40 minutes | 93％ |
| 4 | 0.04mm | 95 | 1∶0.25B---97％ | CaO | 1％ | Water glass | 2％ | / | 15mm | 900℃ | 60 minutes | 88％ |
| 5 | 0.043mm | 90 | 1∶0.25B---93％ | CaCO 3 | 1％ | Bentonite | 6％ | / | 25mm | 900℃ | 60 minutes | 85％ |
| 6 | 0.042mm | 91 | 1∶0.25A---96％ | Rhombspar | 2％ | Water glass | 2％ | / | 10mm | 1050℃ | 20 minutes | 95％ |
| 7 | 0.048mm | 90 | 1∶0.35B---96％ | Na 2CO 3 | 0.5％ | Bentonite | 2％ | Unslaked lime 1.5% | 30mm | 900℃ | 60 minutes | 90％ |
| 8 | 0.041mm | 93 | 1∶0.25A---97％ | Na 2CO 3 | 1％ | Water glass | 2％ | / | 10mm | 900℃ | 30 minutes | 92％ |
| 9 | 0.044mm | 90 | 1∶0.3A---96％ | Na 2CO 3 | 2％ | Water glass | 2％ | / | 15mm | 800℃ | 90 minutes | 91％ |
| 10 | 0.042mm | 91 | 1∶0.35A-94.5％ | CaO | 2％ | Bentonite | 2％ | CaO 1.5％ | 25mm | 800℃ | 100 minutes | 90％ |
| 11 | 0.040mm | 92 | 1∶0.25A---92％ | CaCO 3 | 4％ | Water glass | 3％ | Rhombspar 1% | 30mm | 600℃ | 150 minutes | 90％ |
| 12 | 0.042mm | 90 | 1∶0.25A---94％ | Na 2CO 3 + CaCO 3 | 3％ | Water glass | 3％ | / | 15mm | 600℃ | 120 minutes | 92％ |
| 13 | 0.094mm | / | 1∶0.3A---94％ | CaCO 3 | 3％ | Water glass | 3％ | / | 20mm | 900℃ | 200 minutes | 50％ |
| 14 | 0.125mm | / | 1∶0.25A-95.1％ | Na 2CO 3 | 2％ | Water glass | 2.9％ | / | 10mm | 950℃ | 180 minutes | 65％ |
| 15 | 0.100mm | / | 1∶0.3A---92％ | Na 2CO 3 | 4％ | Water glass | 4％ | / | 15mm | 1050℃ | 150 minutes | 73％ |
Annotate: A is that hard coal, B are bituminous coal.Sulfur content of raw material and desulfurization degree are respectively: 3#0.21%, 88%; 7#0.18%, 86%; 10#0.25%, 87%; 11#0.2%, 90%.
Table 2 is the comparative result of the inventive method embodiment and prior art
| Fuel consumption | Energy consumption | Production efficiency | Environmental protection | Major equipment | |
| Blast furnace | 760kg coal (coke is converted into coking coal) does not comprise coking, sintering, hot blast energy consumption | 11GJ (blast-furnace body) | Big blast furnace (＞1000m 3)～2.5t/m 3Day small furnace (500m 3)～3.5t/m 3·day | The big cooling water consumption of the maximum quantity of slag of waste gas is big | Sintering system coker blast-furnace body system hotblast stove |
| Corex | ～1000kg | 23GJ | Reduction shaft furnace+melting Gas-making Furnace～4～7t/m 3·day | The big water coolant of the maximum quantity of slag of CO2 gas is more | Melting Gas-making Furnace system of reduction shaft furnace system coal gas system |
| Midrex | Use Sweet natural gas to make reductive agent (300m 3) | 11GJ | Reduction section+preheating section 7.3t/m 3·day | It is minimum to pollute the moderate quantity of slag | Reduction furnace gas reforming stove |
| Rotary kiln | ～800kg | 13.4GJ | 0.35t/m 3·day | The many quantity of slag of waste gas are bigger | Rotary kiln |
| This technology | ～500kg | 6.9GJ | Reduction section+preheating section＞900 ℃～20t/m 3·day 500～900℃10～20t/m 3·day | Pollute little | The efficient ball mill reduction furnace |
Claims (4)
1, a kind of low temperature fast restore powdered iron ore is produced the method for sponge iron, the idiographic flow of this production method is, adopt iron ore concentrate, coal dust and the catalyzer that is added, sweetening agent in ball mill, to carry out adding binding agent again after the fragmentation and carry out mixed pelletizing, in heating installation, reduce after the pelletizing drying and obtain sponge iron, the granularity that it is characterized in that making the raw materials used powder of ball is 2-80 μ m, the batch mixing weight ratio of powdered iron ore and coal dust is 1 in making the raw materials used powder of ball: 0.2-0.4, the catalyzer in the reduction powder is for containing Li
+, Na
+, K
+, Ca
2+, Sr
2+, Ba
2+Or Mg
2+In any one compound; Sweetening agent in the reduction powder is any one in rhombspar, unslaked lime, the Wingdale; Binding agent is meant in water glass, clay, the bentonite any one in the reducing material powder; Gross weight with the reduction powder is a benchmark, the adding weight % of powdered iron ore, coal dust is: 82-98%, binding agent adds weight %: 1-10%, catalyzer adds weight %: 0.1-5%, the adding weight % of sweetening agent is≤3%, and the gross weight % of powdered iron ore, coal dust, catalyzer, binding agent and sweetening agent is 100%; Reduction reaction temperature is 500-1100 ℃, and the reduction reaction time is 10-200 minute.
2, according to the described production method of claim 1, a kind of feature of low temperature fast restore powdered iron ore production sponge iron process also comprise granularity be the powder of 2-40 μ m account for reduction powder gross weight 90%.
3, according to the described production method of claim 1, a kind of feature of low temperature fast restore powdered iron ore production sponge iron process comprises that also making the used binding agent of ball is by the combination more than any one in water glass, clay, the bentonite.
4, according to the described method of claim 1, a kind of feature of low temperature fast restore powdered iron ore production sponge iron process comprises that also the catalyzer of reduction in the powder is for containing Li
+, Na
+, K
+, Ca
2+, Sr
2+, Ba
2+Or Mg
2+Compound in any two or more combination.
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|---|---|---|---|
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| US8518146B2 (en) | 2009-06-29 | 2013-08-27 | Gb Group Holdings Limited | Metal reduction processes, metallurgical processes and products and apparatus |
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| CN103468343A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Sulfur-fixing agent for carbon-containing pellets and preparation method thereof |
| CN106755956A (en) * | 2016-11-24 | 2017-05-31 | 攀枝花市徳铭再生资源开发有限公司 | The low temperature smelting method of vanadium titano-magnetite |
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| US8518146B2 (en) | 2009-06-29 | 2013-08-27 | Gb Group Holdings Limited | Metal reduction processes, metallurgical processes and products and apparatus |
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| CN1557973A (en) | 2004-12-29 |
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