CN104263916A - Adhesive for pellet and preparation method of pellet - Google Patents

Adhesive for pellet and preparation method of pellet Download PDF

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Publication number
CN104263916A
CN104263916A CN201410526558.3A CN201410526558A CN104263916A CN 104263916 A CN104263916 A CN 104263916A CN 201410526558 A CN201410526558 A CN 201410526558A CN 104263916 A CN104263916 A CN 104263916A
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pellet
binding agent
ball
present
adhesive
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CN201410526558.3A
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CN104263916B (en
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杨志英
赫英军
徐剑南
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00Preliminary treatment of ores or scrap
    • C22B1/14Agglomerating; Briquetting; Binding; Granulating
    • C22B1/24Binding; Briquetting ; Granulating
    • C22B1/242Binding; Briquetting ; Granulating with binders

Abstract

The invention provides adhesive for a pellet and a preparation method of the pellet. The adhesive for the pellet comprises the following constituents in percentage by weight: 76-98% of a magnesium-containing substance, 1-10% of a calcium-containing substance, and 1-15% of vegetable albumen glue. The adhesive provided by the invention is used for preparing the pellet, the reduced expansion rate of the obtained pellet is lowered, and the quality of the pellet is effectively improved; meanwhile, the agglomerate combined with the pellet to be used is free of addition of the magnesium-containing substance, so as to greatly improve the quality of the agglomerate; furthermore, when the adhesive provided by the invention is used for preparing the pellet, the adhesive has good economic benefit and emission reduction effect. The experimental results show that the reduced expansion rate of the prepared pellet is decreased by 6%; when the adhesive is applied to a pelletizing plant with a pellet production capacity of 2,100,000 tons per year, the annual composite economic result is 5,411,000 Yuan per year, the discharge of the blast furnace slag can be decreased by 32,200 tons per year, and the emission load of CO2 can be reduced by 35,780 tons per year.

Description

A kind of for the tackiness agent of pellet and the preparation method of pellet
Technical field
The present invention relates to ironmaking technology field, particularly relate to a kind of tackiness agent of pellet and the preparation method of pellet.
Background technology
Pellet is that fine grinding concentrate is made the lumpy material that can meet smelting requirements, namely be by raw materials such as fine grinding fine ore and binding agents, prepare burden by a certain percentage and mix, through technological processs such as pelletizing, drying, roasting, coolings, consolidation becomes the ball-type iron-bearing material with some strength and metallurgical performance.In pellet, Iron grade is high, impurity is few, chemical composition stability, is conducive to the raising of blast furnace feed grade; Pellet epigranular, intensity is good, powder is few, and blast fumance can be made more smooth and easy, and protection smelting equipment, boosts productivity; Be conducive to Reasonable adjustment Bf Burden; Be conducive to saving energy and reduce the cost, reduce pollution to environment.
It is wilkinite that prior art prepares the binding agent that pellet often adopts, and wilkinite wherein, owing to having comparatively strong cohesive property, adsorptivity and cationic exchange and high-temperature stability etc., is usually used in the preparation of iron ore pellets.In fine iron breeze, add the wilkinite of 1.5wt% ~ 4.5wt%, after pelletizing, drying, roasting, cooling, become pelletizing, provide high quality raw material with agglomerate with the use of for blast furnace.
But in prior art, blast furnace uses the ratio of pellet to never have breakthrough 30%, and this is mainly due to Fe in pellet 2o 3content is high, causes the reduction swellability of pellet too high in reduction process, and blast furnace vast scale causes stove ore deposit to have some setbacks because pellet ore reduction swellability rate index is not good after using pellet.
Summary of the invention
The object of the present invention is to provide a kind of for the binding agent of pellet and the preparation method of pellet, binding agent provided by the invention is used for the preparation of pellet, and the pellet obtained has lower reduction swellability rate.
The invention provides a kind of binding agent for pellet, comprise following component:
76wt% ~ 98wt% contains magnesium material, and the described quality containing magnesium material is in magnesium oxide;
The calcareous material of 1wt% ~ 10wt%, the quality of described calcareous material is in calcium oxide;
The vegetable-protein glue of 1wt% ~ 15wt%.
Preferably, what comprise 81wt% ~ 94wt% contains magnesium material.
Preferably, the described magnesium material that contains comprises magnesium oxide and/or magnesiumcarbonate..
Preferably, the described magnesium material that contains comprises wagnerite;
Described calcareous material is wagnerite.
Preferably, following component is comprised:
The wagnerite of 94wt% ~ 96wt%;
The vegetable-protein glue of 4wt% ~ 6wt%.
Preferably, described is powdery containing magnesium material;
The described particle diameter containing magnesium material is less than 0.2mm.
Preferably, the vegetable-protein glue of 2.4wt% ~ 12.7wt% is comprised.
The invention provides a kind of preparation method of pellet, comprise the following steps:
By the binding agent mixture described in iron ore and technique scheme, obtain mixture, the mass ratio of described iron ore and binding agent is 100:(3 ~ 6);
By described mixture balling-up, obtain green-ball;
Described green-ball is carried out roasting, obtains pellet finished product.
Preferably, the mass ratio of described iron ore and binding agent is 100:(4 ~ 5).
Preferably, the water content 8.8wt% ~ 9.8wt% of described mixture.
Preferably, the time of described balling-up is 10min ~ 15min.
Preferably, the temperature of described roasting is 1200 DEG C ~ 1320 DEG C.
The invention provides a kind of binding agent for pellet, comprise following component: 76wt% ~ 98wt% contains magnesium material; The calcareous material of 1wt% ~ 10wt%; The vegetable-protein glue of 1wt% ~ 15wt%.Wilkinite is adopted to prepare compared with the technical scheme of pellet as binding agent with prior art, binding agent provided by the invention is used for the preparation of pellet, the pellet ore reduction swellability rate obtained declines, experimental result shows, the reduction swellability rate of the pellet that the present invention prepares reduces 6%, effectively improves the quality of pellet.
And, not containing SiO in binding agent provided by the invention 2and Al 2o 3, decrease SiO in furnace charge 2and Al 2o 3content, improves feed grade; Containing Mg in binding agent provided by the invention, with it with the use of agglomerate without the need to adding magnesium oxide again, improve the quality of agglomerate; Experimental result shows, adopts binding agent provided by the invention, can improve feed grade 0.09%; The agglomerate used that matches is cancelled with addition of containing magnesium material, has increased substantially sinter quality.
And adopt binding agent provided by the invention to prepare pellet and have good economic benefit and reduce discharging benefit, the raising of feed grade, can increase production, fall Jiao, and saves the magnesian use of agglomerate; Quantity discharged and the CO of slag can also be reduced 2quantity discharged.Experimental result shows, applies in the pelletizing plant of pellet formation ability 2,100,000 tons/year, year overall economic efficiency be 541.1 ten thousand yuan/year, blast furnace slag 3.22 ten thousand tons/year can be reduced discharging, can CO be reduced 2quantity discharged 2.93 ten thousand tons/year.
Embodiment
The invention provides a kind of binding agent for pellet, comprise following component:
76wt% ~ 98wt% contains magnesium material;
The calcareous material of 1wt% ~ 10wt%;
The vegetable-protein glue of 1wt% ~ 15wt%.
Binding agent provided by the invention and iron ore batch mixing, prepare pellet, and described binding agent makes the reduction swellability rate of the pellet obtained reduce, and effectively improves the quality of pellet.Experimental result shows, the reduction swellability rate of the pellet that the present invention prepares reduces 6%.
Binding agent for pellet provided by the invention comprise 76wt% ~ 98wt% containing magnesium material, be preferably 81wt% ~ 94wt%.In the present invention, describedly preferably include magnesium oxide and/or magnesiumcarbonate containing magnesium material, when described be magnesium oxide containing magnesium material time, binding agent provided by the invention preferably includes the magnesium oxide of 81wt% ~ 90wt%, be more preferably 81.5wt% ~ 88.5wt%, most preferably be 81.6wt% ~ 87.7wt%; When described containing magnesium material be magnesiumcarbonate time, binding agent provided by the invention preferably includes the magnesiumcarbonate of 90wt% ~ 95wt%, is more preferably 90.3wt% ~ 94wt%, most preferably is 90.3wt% ~ 93.8wt%.Concrete, in embodiment in the present invention, the described magnesium material that contains can be specially wagnerite, and described wagnerite comprises magnesiumcarbonate, calcium carbonate and silicon-dioxide; The mass content of described wagnerite in described binding agent is preferably 92wt% ~ 98wt%, is more preferably 94wt% ~ 97wt%, most preferably is 94wt% ~ 96wt%.In the present invention, in described wagnerite, the mass content of calcium carbonate is preferably 85wt% ~ 90wt%, is more preferably 87wt% ~ 89wt%, most preferably is 88.58wt%; In described wagnerite, the mass content of described calcium carbonate is preferably 2wt% ~ 5wt%, is more preferably 2.5wt% ~ 3.5wt%, most preferably is 3.1wt%; In described wagnerite, in described calcium carbonate, the mass content of silicon-dioxide is preferably 2wt% ~ 5wt%, is more preferably 3wt% ~ 4wt%, most preferably is 3.3wt%.
In the present invention, the described magnesium material that contains is preferably powdery; The described particle diameter containing magnesium material is preferably less than 0.2mm, is more preferably and is less than 0.05mm, most preferably be 0.01mm ~ 0.05mm.
Binding agent provided by the invention comprises containing magnesium material, makes the physical index of the pellet obtained and hot index be obtained for improvement; When using binding agent provided by the invention to prepare pellet, the agglomerate of follow-up use is without the need to adding magnesium oxide again, and its grade can improve 0.13%, is equivalent to improve feed grade 0.09%.And, adopt binding agent provided by the invention to prepare pellet, make in the pellet obtained containing metal M g, become magnesia pelletizing, the magnesium in this pellet is useful to molten iron, in ironmaking or steelmaking process, can have the effect of clean molten iron, and the slag produced is less.
Binding agent for pellet provided by the invention comprises the calcareous material of 1.5wt% ~ 10wt%, is preferably 1.8wt% ~ 6.3wt%.In the present invention, described calcareous material is preferably calcium oxide and/or calcium carbonate; Concrete, when described calcareous material is calcium oxide, described calcium oxide mass content is in a binder preferably 1.5wt% ~ 4wt%, is more preferably 1.8wt% ~ 3.6wt%; When described calcareous material is calcium carbonate, described calcium carbonate mass content is in a binder preferably 2.5wt% ~ 8wt%, is more preferably 3.2wt% ~ 6.3wt%.In an embodiment of the present invention, when described containing magnesium material be wagnerite time, the calcium carbonate contained in wagnerite described in technique scheme of the present invention can meet the needs of binding agent, without the need to adding calcareous material in addition again.
Binding agent for pellet provided by the invention comprises the vegetable-protein glue of 1wt% ~ 15wt%, is preferably 2.4wt% ~ 12.7wt%, most preferably is 4wt% ~ 10wt%.In the present invention, described vegetable-protein glue is preferably powdery, and the granularity of described vegetable-protein glue is preferably 200 orders; The source of the present invention to described vegetable-protein glue does not have special restriction, adopts the commercial goods of described vegetable-protein glue, prepares and the vegetable-protein glue sold as adopted Chinese forest-science academy.
The preparation method of the present invention to the described binding agent for pellet does not have special restriction, adopts the preparation method of composition well known to those skilled in the art.The present invention preferably mixes described in technique scheme with vegetable-protein glue containing magnesium material, calcareous material, can obtain the binding agent for pellet.
Present invention also offers a kind of preparation method of pellet, comprise the following steps:
By the binding agent mixture described in iron ore and technique scheme, obtain mixture, the mass ratio of described iron ore and binding agent is 100:(3 ~ 6);
By described mixture balling-up, obtain green-ball;
Described green-ball is carried out roasting, obtains pellet finished product.
The present invention, by binding agent mixture described in iron ore and technique scheme, obtains mixture, and the mass ratio of described iron ore and binding agent is 100:(3 ~ 6).In the present invention, described iron ore is preferably iron ore concentrate, is more preferably magnetite.In described iron ore concentrate ,-200 object content are preferably greater than 80wt%, are more preferably and are greater than 90wt%.
In the present invention, the mass ratio of described iron ore and described binding agent is 100:(3 ~ 6), be more preferably 100:(4 ~ 5).In an embodiment of the present invention, the consumption of described binding agent can according to SiO in pelletizing 2content determine, concrete, the content of Mg in described binding agent is converted to magnesian quality, in magnesian quality, SiO in magnesian quality and pelletizing in described binding agent 2mass ratio be preferably (0.4 ~ 0.5): 1, be more preferably (0.44 ~ 0.46): 1.
The equipment of the present invention to described mixture does not have special restriction, adopts the mixing equipment adopted when preparing pellet well known to those skilled in the art, as prepared burden on proportioning belt.
The mixture of iron ore and binding agent and water preferably mix by the present invention, obtain pelletizing raw material.In the present invention, the water content of described pelletizing raw material is preferably less than 9wt%, is more preferably 8wt% ~ 8.5wt%.
After obtaining pelletizing raw material, the present invention, by the balling-up of described pelletizing raw material, obtains green-ball.The method of the present invention to described balling-up does not have special restriction, adopts the balling-up technical scheme adopted in pellet preparation technology well known to those skilled in the art.Concrete can be placed in pelletizer pelletizing by described pelletizing raw material.The kind of the present invention to described pelletizer does not have special restriction, adopts pelletizer well known to those skilled in the art, as being drum pelletizer, can also be balling disc.
In the present invention, the particle diameter of described green-ball is preferably 9mm ~ 16mm; The material powder of the diameter < 5mm that balling-up obtains and diameter > 16mm preferably carries out green-ball pulverizing, and pelletizing, screening, make green-ball again.In the present invention, the preferred < 10wt% of moisture content of described green-ball, is more preferably 9.0wt% ~ 9.5wt%.
In the present invention, the process of described balling-up preferably includes that mother bulb is formed, green-ball grows up and compacting process.In the present invention, the time of described balling-up is preferably 10min ~ 15min, is more preferably 11min ~ 13min, most preferably is 12min.Concrete, in the present invention, the time that described mother bulb is formed, by being preferably 2min ~ 4min, being more preferably 2.5min ~ 3.5min, most preferably being 3min; The time that described green-ball is grown up is preferably 5min ~ 7min, is more preferably 5.5min ~ 6.5min, most preferably is 6min; The time of described compacting process is preferably 2min ~ 4min, is more preferably 2.5min ~ 3.5min, most preferably is 3min.
After obtaining green-ball, described green-ball is preferably carried out roasting by the present invention, obtains pellet finished product.In the present invention, the temperature of described roasting is preferably 1200 DEG C ~ 1320 DEG C, is more preferably 1250 DEG C ~ 1300 DEG C, most preferably is 1270 DEG C; 12 minutes ~ 14 minutes time of described roasting.The present invention does not have special restriction to the equipment that described roasting is used, and adopting the roasting apparatus adopted when preparing pellet well known to those skilled in the art, as adopted belt machine roasting apparatus, also can be grate kiln roasting apparatus.
The performance of the present invention to the green-ball obtained and pellet is tested, concrete: adopt green pellet cracking determinator to carry out green pellet cracking performance test, require burst temperature >=300 DEG C;
Compression strength of green pellet trier is adopted to carry out intensity test to green-ball, resistance to compression >=12N/ ball;
Adopt green-ball drop detector to fall performance to green-ball to test, height of fall is 0.5m, drop number >=4 time.
The invention provides a kind of binding agent for pellet, wilkinite is adopted to prepare compared with the technical scheme of pellet as binding agent with prior art, binding agent provided by the invention is used for the preparation of pellet, the pellet ore reduction swellability rate obtained declines, and effectively improves the quality of pellet.
And, containing Mg in binding agent provided by the invention, with it with the use of agglomerate without the need to adding magnesium oxide again, improve feed grade, experimental result shows, adopts binding agent provided by the invention, can improve feed grade 0.09%; And adopt binding agent provided by the invention to prepare pellet and have good economic benefit and reduce discharging benefit, the raising of feed grade, can increase production, fall Jiao, and saves the magnesian use of agglomerate; Quantity discharged and the CO of slag can also be reduced 2quantity discharged.
Direct economy effect:
After pelletizing uses binding agent provided by the invention, grade of sinter improves 0.13%, and in blast furnace burden, agglomerate ratio is by 70%, then improve blast furnace feeding grade 0.09%, and rule of thumb formula blast furnace feeding grade improves 1%, and volume increase 2% falls burnt 3%.Current ton ferropexy expense is 150 yuan, and comprehensive coke price is 1150 yuan/ton, and ton iron comprehensive coke ratio is 490kg/t, then ton iron benefit is:
(1) yield increase effect
150-[1 ÷ (1+0.09 × 1 × 2%)] × 100=0.270 yuan/ton
(2) burnt benefit is fallen
(490 ÷ 1000) × 0.09 × 3% × 1150=1.523 yuan/ton
(3) blast furnace year economic benefit
Belt pelletizing year produces pellet 2,100,000 tons, and current ton iron ore consumption is 1.62, and pellet ratio is 30%, then ton iron consumes pellet 0.486,2,100,000 tons of pellets and can produce 432.1 ten thousand tons of pig iron, and the volume increase of the pig iron is fallen burnt benefit and is:
432.1 × (0.270+1.523)=774.76 ten thousand yuan/year;
(4) the magnesite expense after agglomerate reduces magnesite consumption reduces
After pelletizing uses binding agent provided by the invention, to stop using magnesite powder, magnesite powder price be 85 yuan/ton (getting home valency containing freight charges), 2,100,000 tons of pelletizings need adapted agglomerate to be 4,900,000 tons, agglomerate magnesite unit consumption 16 kg/ton agglomerate, its annual cost is:
85 × 490 × 16 ÷ 1000=666.4 ten thousand yuan/year;
(5) the cost change using binding agent provided by the invention to bring
The wilkinite unit price now used is 351 yuan/ton, and binding agent provided by the invention is 230 yuan/ton, and two kinds of binding agent unit consumption are respectively 14.0 kg/ton pellets and 40 kg/ton pellets, and pelletizing cost changing conditions is:
Pellet cost per ton increases
230 × 40 ÷ 1000-351 × 14 ÷ 1000=4.286/ ton pellets;
Annual cost increases:
2100000 tons × 4.098=900.06 ten thousand yuan/year;
(6) comprehensive income is year:
774.76+666.4-900.06=541.1 ten thousand yuan/year.
Reduce discharging benefit
Reduce blast furnace slag quantity discharged:
It is 2,100,000 tons that current belt pelletizing year produces pellet, needs wilkinite amount to be 2.24 ten thousand tons, after using binding agent provided by the invention in year, young wilkinite 2.24 ten thousand tons.In wilkinite, the composition of about 60wt% is SiO 2, the basicity of blast furnace slag is about 1.4, in and wilkinite in SiO 2the amount of the CaO that must add is:
2.24 × 60% × 1.4=1.88 ten thousand tons;
The blast furnace quantity of slag reduced is:
2.24 × 60%+1.88=3.22 ten thousand tons;
Namely can reduce discharging blast furnace slag year is 3.22 ten thousand tons.
Reduce greenhouse gases CO 2quantity discharged:
Because CaO is that decomposition of limestone gets, according to calculating, produce 1 ton of CaO by the CO of generation 0.44 ton 2quantity discharged, then because the few wilkinite of belt pelletizing to cause in blast furnace slag few CaO amount to be 1.88 ten thousand tons, then year reduces the CO of decomposition of limestone 2quantity discharged be:
1.88 × 0.786=0.83 ten thousand tons;
Reduce the CO that comprehensive coke ratio is less 2quantity discharged:
According to calculating, 1 ton of carbon perfect combustion is by the CO of generation 3.67 tons 2, because of the rising of feed grade, the carbon amounts that ton iron reduces is:
(490 ÷ 1000) × 0.09 × 3%=0.0013 ton/ton iron;
2100000 tons of ball ore deposits can produce 432.1 ten thousand tons of pig iron, then the carbon amounts reduced is:
432.1 × 0.0013=0.572 ten thousand tons;
The CO reduced 2quantity discharged is
0.572 × 3.67=2.10 ten thousand tons;
Year reduces greenhouse gases CO 2quantity discharged be:
0.83+2.10=2.93 ten thousand tons.
According to the above analysis, the direct economic benefit of 541.1 ten thousand yuan can be produced every year, can reduce by 2.93 ten thousand tons of CO every year 2discharge, can reduce by the blast furnace slag quantity discharged of 3.22 ten thousand tons every year.
In order to further illustrate the present invention, being described in detail for the binding agent of pellet and the preparation method of pellet provided by the invention below in conjunction with embodiment, but they can not being interpreted as limiting the scope of the present invention.
In embodiment 1 ~ 2, vegetable-protein glue is purchased from Chinese forest-science academy.
In following embodiment 3 ~ 6, iron ore concentrate adopts rhombohedral iron ore and magnetite, and the physical and chemical index of rhombohedral iron ore and magnetite is as shown in table 1:
The physical and chemical index of the iron ore concentrate that table 1 embodiment of the present invention adopts
Following testing installation is adopted: balling disc: Φ 1000 × 200 in following embodiment; Green pellet cracking determinator: Φ 500 × 1000; Compression strength of green pellet trier: WKD-10 (20N); Green-ball drop detector: 0.5m; Sai Duolisi Moisture Meter: MA30-000V 3.
Embodiment 1
The vegetable-protein glue process of magnesite stone flour and 4wt% that 96wt%, granularity are less than 0.2mm stirs, mixes, and obtains the binding agent for pellet.
Embodiment 2
The vegetable-protein glue process of magnesite stone flour and 6wt% that 94wt%, granularity are less than 0.2mm stirs, mixes, and obtains the binding agent for pellet.
Embodiment 3
The binding agent 4wt% manual mixing magnetite of 67wt%, the rhombohedral iron ore of 29wt% and 4wt% embodiment 1 prepared stirs material, is mixed by material; Add water in material, make moisture content be 8.0wt%, obtain balling-up material;
Balling-up material is placed in balling disc and carries out pelletizing, the balling-up time is 12min, and wherein: mother bulb formation time is 3min, the green-ball time of growing up is 6min, and the closely knit time is 3min;
The present invention to green-ball resistance to compression, fall, burst temperature detects, require: resistance to compression >=12N/ ball; Fall >=4 times; Burst temperature >=300 DEG C;
Adopt electric tube furnace to carry out roasting test, maturing temperature is 1270 DEG C, and carries out materialization and hot index analysis, and result is as shown in table 2, and table 2 is the performance test results of the green-ball that the embodiment of the present invention 3 ~ 6 and comparative example 1 obtain.
The finished ball obtained is carried out chemical composition analysis and hot index test by the present invention, and result is as shown in table 3, and table 3 is the test result of the finished ball that the embodiment of the present invention 3 ~ 6 and comparative example 1 obtain.
Embodiment 4
The technical scheme of embodiment 3 is adopted to prepare pellet, unlike, the binding agent that the present embodiment adopts is the binding agent that embodiment 2 prepares, and the mass content of binding agent is 4wt%; The mass content of magnetite is 67wt%, and the mass content of rhombohedral iron ore is 28wt%.。
The present invention adopts the performance of the testing method of embodiment 3 to the green-ball obtained and finished ball to test, result is as shown in table 2 and table 3, the performance test results of the green-ball that table 2 obtains for the embodiment of the present invention 3 ~ 6 and comparative example 1, table 3 is the test result of the finished ball that the embodiment of the present invention 3 ~ 6 and comparative example 1 obtain.
Embodiment 5
The technical scheme of embodiment 3 is adopted to prepare pellet, unlike, in the present embodiment, the mass content of binding agent is 5wt%, and the mass content of magnetite is 67wt%, and the mass content of rhombohedral iron ore is 28wt%.
The present invention adopts the performance of the testing method of embodiment 3 to the green-ball obtained and finished ball to test, result is as shown in table 2 and table 3, the performance test results of the green-ball that table 2 obtains for the embodiment of the present invention 3 ~ 6 and comparative example 1, table 3 is the test result of the finished ball that the embodiment of the present invention 4 ~ 7 and comparative example 1 obtain.
Embodiment 6
The technical scheme of embodiment 3 is adopted to prepare pellet, unlike, the binding agent that the present embodiment adopts is the binding agent that embodiment 2 prepares, and the mass content of binding agent is 5wt%, the mass content of magnetite is 67wt%, and the mass content of rhombohedral iron ore is 28wt%.
The present invention adopts the performance of the testing method of embodiment 3 to the green-ball obtained and finished ball to test, result is as shown in table 2 and table 3, the performance test results of the green-ball that table 2 obtains for the embodiment of the present invention 3 ~ 6 and comparative example 1, table 3 is the test result of the finished ball that the embodiment of the present invention 3 ~ 6 and comparative example 1 obtain.
Comparative example 1
The technical scheme of embodiment 3 is adopted to prepare pellet, unlike, in this comparative example, binding agent is wilkinite, and the mass content of binding agent is 2.1wt%, and the mass content of magnetite is 68wt%, and the mass content of rhombohedral iron ore is 29.9wt%.
The present invention adopts the performance of the testing method of embodiment 4 to the green-ball obtained and finished ball to test, result is as shown in table 2 and table 3, the performance test results of the green-ball that table 2 obtains for the embodiment of the present invention 3 ~ 6 and comparative example 1, table 3 is the test result of the finished ball that the embodiment of the present invention 3 ~ 6 and comparative example 1 obtain.
The performance test results of the green-ball that table 2 embodiment of the present invention 3 ~ 6 and comparative example 1 obtain
As can be seen from Table 2: after using tackiness agent provided by the invention, every physical index of the green-ball prepared and hot index are obtained for improvement.
. the test result of the finished ball that table 3 embodiment of the present invention 3 ~ 6 and comparative example 1 obtain
Note: RDI is pelletizing low temperature reduction degradation index.
As can be seen from Table 3, after using tackiness agent provided by the invention, content of MgO increase, make with it with the use of agglomerate in without the need to adding magnesium oxide again, its grade can improve 0.13%, be equivalent to improve feed grade 0.09%; Use tackiness agent provided by the invention to prepare pellet, agglomerate its quality after magnesite of stopping using can be greatly improved; Use tackiness agent provided by the invention to prepare pellet, its reduction swellability rate reduces 6%, effectively improves pellet quality.
As seen from the above embodiment, the binding agent for pellet that the invention provides comprises following component: 76wt% ~ 98wt% contains magnesium material; The calcareous material of 1wt% ~ 10wt%, the vegetable-protein glue of 1wt% ~ 15wt%.Wilkinite is adopted to prepare compared with the technical scheme of pellet as binding agent with prior art, binding agent provided by the invention is used for the preparation of pellet, the pellet ore reduction swellability rate obtained declines, experimental result shows, the reduction swellability rate of the pellet that the present invention prepares reduces 6%, effectively improves the quality of pellet.
And containing Mg in binding agent provided by the invention, the magnesium oxide without the need to adding again in agglomerate, improves feed grade, and experimental result shows, adopts binding agent provided by the invention, can improve feed grade 0.09%; And adopt binding agent provided by the invention to prepare pellet and have good economic benefit and reduce discharging benefit, the raising of feed grade, can increase production, fall Jiao, and saves the magnesian use of agglomerate; Quantity discharged and the CO of slag can also be reduced 2quantity discharged.Experimental result shows, the pelletizing plant being 2,100,000 tons/year in pellet formation ability applies, and within its year, overall economic efficiency is 541.1 ten thousand yuan/year, can reduce discharging blast furnace slag 3.22 ten thousand tons/year, can reduce CO 2quantity discharged 2.93 ten thousand tons/year.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (12)

1., for a binding agent for pellet, comprise following component:
76wt% ~ 98wt% contains magnesium material;
The calcareous material of 1wt% ~ 10wt%;
The vegetable-protein glue of 1wt% ~ 15wt%.
2. the binding agent for pellet according to claim 1, is characterized in that, what comprise 81wt% ~ 94wt% contains magnesium material.
3. the binding agent for pellet according to claim 1, is characterized in that, the described magnesium material that contains comprises magnesium oxide and/or magnesiumcarbonate.
4. the binding agent for pellet according to claim 1, is characterized in that, the described magnesium material that contains comprises wagnerite;
Described calcareous material is wagnerite.
5. the binding agent for pellet according to claim 4, is characterized in that, comprises following component:
The wagnerite of 94wt% ~ 96wt%;
The vegetable-protein glue of 4wt% ~ 6wt%.
6. the binding agent for pellet according to claim 1, is characterized in that, described is powdery containing magnesium material;
The described particle diameter containing magnesium material is less than 0.2mm.
7. the binding agent for pellet according to claim 1, is characterized in that, comprises the vegetable-protein glue of 2.4wt% ~ 12.7wt%.
8. a preparation method for pellet, comprises the following steps:
By the binding agent mixture described in iron ore and claim 1 ~ 7 any one, obtain mixture, the mass ratio of described iron ore and binding agent is 100:(3 ~ 6);
By described mixture balling-up, obtain green-ball;
Described green-ball is carried out roasting, obtains pellet finished product.
9. preparation method according to claim 8, is characterized in that, the mass ratio of described iron ore and binding agent is 100:(4 ~ 5).
10. preparation method according to claim 8, is characterized in that, the water content 8.8wt% ~ 9.8wt% of described mixture.
11. preparation methods according to claim 8, is characterized in that, the time of described balling-up is 10min ~ 15min.
12. preparation methods according to claim 8, is characterized in that, the temperature of described roasting is 1200 DEG C ~ 1320 DEG C.
CN201410526558.3A 2014-10-09 2014-10-09 Adhesive for pellet and preparation method of pellet Expired - Fee Related CN104263916B (en)

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CN111057841A (en) * 2019-12-28 2020-04-24 海城市鹏程镁矿有限公司 Magnesite powder ore pelletizing method using inorganic binder
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CN107365908A (en) * 2017-07-14 2017-11-21 鞍山市正大炉料有限公司 A kind of magnesia compound binding agent of pellet and preparation method thereof and application method
CN111057841A (en) * 2019-12-28 2020-04-24 海城市鹏程镁矿有限公司 Magnesite powder ore pelletizing method using inorganic binder
CN111057842A (en) * 2019-12-28 2020-04-24 海城市鹏程镁矿有限公司 Method for preparing magnesite powder ore green ball by carbon dioxide carbonization method

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