CN104263916B - Adhesive for pellet and preparation method of pellet - Google Patents
Adhesive for pellet and preparation method of pellet Download PDFInfo
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- CN104263916B CN104263916B CN201410526558.3A CN201410526558A CN104263916B CN 104263916 B CN104263916 B CN 104263916B CN 201410526558 A CN201410526558 A CN 201410526558A CN 104263916 B CN104263916 B CN 104263916B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
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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
Technical field
The present invention relates to ironmaking technology field, more particularly to a kind of preparation method of the binding agent and pellet of pellet.
Background technology
Pellet is to be constructed to meet the lump material of smelting requirements by fine grinding concentrate, is by fine grinding fine ore and bonding
The raw materials such as agent, dispensing and mixing by a certain percentage, through technical processs such as pelletizing, drying, roasting, coolings, consolidation becomes and has
The ball-type iron-bearing material of 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, protection
Smelting equipment, improves productivity ratio；Be conducive to Reasonable adjustment Bf Burden；Be conducive to dirt energy-saving, that reduction is to environment
Dye.
Prior art prepare pellet frequently with binding agent be bentonite, bentonite therein is due to boning with relatively strong
Property, adsorptivity and cation exchange and high-temperature stability etc., are usually used in the preparation of iron ore pellets.Add in fine iron breeze
The bentonite of 1.5wt%～4.5wt%, Jing after pelletizing, drying, roasting, cooling into pelletizing, is used cooperatively as blast furnace with sintering deposit
Quality raw materials are provided.
But in prior art, blast furnace never breaks through 30% using the ratio of pellet, and this is mainly due to pelletizing
Fe in ore deposit2O3Content is high, causes the reduction swellability of pellet too high in reduction process, after blast furnace vast scale uses pellet, because
Pellet ore reduction swellability rate index is not good and causes stove ore deposit to have some setbacks.
The content of the invention
It is an object of the invention to provide a kind of preparation method of the binding agent and pellet for pellet, the present invention is carried
For binding agent be used for the preparation of pellet, the pellet for obtaining has relatively low reduction swellability rate.
The invention provides a kind of binding agent for pellet, including following components：
The material containing magnesium of 76wt%～98wt%, the quality containing magnesium material is in terms of magnesium oxide；
The calcareous material of 1wt%～10wt%, the quality of the calcareous material is in terms of calcium oxide；
The vegetable protein glue of 1wt%～15wt%.
Preferably, including 81wt%～94wt% materials containing magnesium.
Preferably, the material containing magnesium includes magnesium oxide and/or magnesium carbonate..
Preferably, the material containing magnesium includes magnesite；
The calcareous material is magnesite.
Preferably, including following components：
The magnesite of 94wt%～96wt%；
The vegetable protein glue of 4wt%～6wt%.
Preferably, the material containing magnesium is powdery；
The particle diameter containing magnesium material is less than 0.2mm.
Preferably, including the vegetable protein glue of 2.4wt%～12.7wt%.
The invention provides a kind of preparation method of pellet, comprises the following steps：
By iron mine and the binding agent mixture described in above-mentioned technical proposal, mixed material, the iron mine and binding agent are obtained
Mass ratio is 100:(3～6)；
By the mixed material balling-up, green-ball is obtained；
The green-ball is carried out into roasting, pellet finished product is obtained.
Preferably, the iron mine and the mass ratio of binding agent are 100:(4～5).
Preferably, water content 8.8wt% of the mixed material～9.8wt%.
Preferably, the time of the balling-up is 10min～15min.
Preferably, the temperature of the roasting is 1200 DEG C～1320 DEG C.
The invention provides a kind of binding agent for pellet, including following components：76wt%～98wt% containing magnesium
Material；The calcareous material of 1wt%～10wt%；The vegetable protein glue of 1wt%～15wt%.Made using bentonite with prior art
The technical scheme that pellet is prepared for binding agent is compared, and the binding agent that the present invention is provided is used for the preparation of pellet, obtains
Pellet ore reduction swellability rate declines, test result indicate that, the reduction swellability rate of the pellet that the present invention is prepared is reduced
6%, effectively increase the quality of pellet.
And, SiO is not contained in the binding agent that the present invention is provided2And Al2O3, reduce SiO in furnace charge2And Al2O3Content, carries
High feed grade；Contain Mg in the binding agent that the present invention is provided, the matched sintering deposit for using need not add magnesium oxide again,
Improve the quality of sintering deposit；Test result indicate that, the binding agent provided using the present invention can improve feed grade 0.09%；
The matching sintering deposit for using is cancelled with addition of material containing magnesium, and sinter quality is greatly improved.
And, the binding agent provided using the present invention prepares pellet to be had good economic benefit and reduces discharging benefit, enters
The raising of stove grade, can increase production, tar reduction, and save the use of the magnesium oxide of sintering deposit；The row that slag can also be reduced
High-volume and CO2Discharge capacity.Test result indicate that, in pelletizing production ability, 2,100,000 tons/year of pelletizing plant is applied, Nian Zong
Conjunction economic benefit is 541.1 ten thousand yuan/year, can reduce discharging 3.22 ten thousand tons/year of blast furnace slag, it is possible to decrease CO22.93 ten thousand tons/year of discharge capacity.
Specific embodiment
The invention provides a kind of binding agent for pellet, including following components：
The material containing magnesium of 76wt%～98wt%；
The calcareous material of 1wt%～10wt%；
The vegetable protein glue of 1wt%～15wt%.
The binding agent that the present invention is provided and iron mine batch mixing, prepare pellet, and the binding agent makes going back for the pellet for obtaining
Former expansion rate is reduced, and effectively increases the quality of pellet.Test result indicate that, the reduction of the pellet that the present invention is prepared
Expansion rate reduces 6%.
Include the material containing magnesium of 76wt%～98wt% provided by the present invention for the binding agent of pellet, preferably
81wt%～94wt%.In the present invention, the material containing magnesium preferably includes magnesium oxide and/or magnesium carbonate, when the thing containing magnesium
When matter is magnesium oxide, the binding agent that the present invention is provided preferably includes the magnesium oxide of 81wt%～90wt%, more preferably
81.5wt%～88.5wt%, most preferably 81.6wt%～87.7wt%；When the material containing magnesium is magnesium carbonate, the present invention
The binding agent of offer preferably includes the magnesium carbonate of 90wt%～95wt%, more preferably 90.3wt%～94wt%, most preferably
90.3wt%～93.8wt%.Specifically, in embodiment in the present invention, the material containing magnesium can be specially magnesite, institute
Stating magnesite includes magnesium carbonate, Calcium Carbonate and silicon dioxide；Mass content of the magnesite in the binding agent is preferred
For 92wt%～98wt%, most preferably more preferably 94wt%～97wt%, 94wt%～96wt%.In the present invention, institute
The mass content for stating Calcium Carbonate in magnesite is preferably 85wt%～90wt%, more preferably 87wt%～89wt%, most preferably
For 88.58wt%；In the magnesite, the mass content of the Calcium Carbonate is preferably 2wt%～5wt%, more preferably
2.5wt%～3.5wt%, most preferably 3.1wt%；In the magnesite, in the Calcium Carbonate, the quality of silicon dioxide contains
Amount is preferably 2wt%～5wt%, most preferably more preferably 3wt%～4wt%, 3.3wt%.
In the present invention, the material containing magnesium is preferably powdery；The particle diameter containing magnesium material is preferably smaller than 0.2mm, more
Preferably less than 0.05mm, most preferably 0.01mm～0.05mm.
The present invention provide binding agent include material containing magnesium, so as to get pellet physical index and hot index all obtain
Improvement is arrived；When the binding agent provided using the present invention prepares pellet, the sintering deposit for subsequently using need not add magnesium oxide again,
Its grade can improve 0.13%, equivalent to raising feed grade 0.09%.And, the binding agent provided using the present invention prepares ball
Nodulizing, so as to get pellet in contain metal Mg, become magnesia pelletizing, the magnesium in the pellet is beneficial to molten iron, ironmaking
Or in steelmaking process, can have the effect of clean molten iron, and the slag for producing is less.
Include the calcareous material of 1.5wt%～10wt% provided by the present invention for the binding agent of pellet, preferably
1.8wt%～6.3wt%.In the present invention, the calcareous material is preferably calcium oxide and/or Calcium Carbonate；Specifically, when described
When calcareous material is calcium oxide, calcium oxide mass content in a binder is preferably 1.5wt%～4wt%, more preferably
For 1.8wt%～3.6wt%；When the calcareous material is Calcium Carbonate, Calcium Carbonate mass content in a binder is excellent
Elect 2.5wt%～8wt%, more preferably 3.2wt%～6.3wt% as.In an embodiment of the present invention, when the material containing magnesium
For magnesite when, the needs of binding agent, nothing are met by the Calcium Carbonate contained in magnesite described in above-mentioned technical proposal of the present invention
Calcareous material need to still further be added.
Include the vegetable protein glue of 1wt%～15wt% provided by the present invention for the binding agent of pellet, preferably
2.4wt%～12.7wt%, most preferably 4wt%～10wt%.In the present invention, the vegetable protein glue is preferably powdery,
The granularity of the vegetable protein glue is preferably 200 mesh；The present invention does not have special restriction to the source of the vegetable protein glue, adopts
With the commercial goods of the vegetable protein glue, the vegetable protein glue that Chinese forest-science academy prepares and sells can be such as adopted i.e.
Can.
The present invention does not have special restriction to the preparation method of the binding agent for pellet, using art technology
The preparation method of compositionss known to personnel.The present invention is preferably by material containing magnesium, calcareous material described in above-mentioned technical proposal
Mix with vegetable protein glue, you can obtain the binding agent for pellet.
Present invention also offers a kind of preparation method of pellet, comprises the following steps：
By iron mine and the binding agent mixture described in above-mentioned technical proposal, mixed material, the iron mine and binding agent are obtained
Mass ratio is 100:(3～6)；
By the mixed material balling-up, green-ball is obtained；
The green-ball is carried out into roasting, pellet finished product is obtained.
Iron mine and binding agent mixture described in above-mentioned technical proposal are obtained mixed material, the iron mine and bonding by the present invention
The mass ratio of agent is 100:(3～6).In the present invention, the iron mine is preferably iron ore concentrate, more preferably magnetic iron ore.The ferrum
In concentrate, the content of -200 mesh is preferably greater than 80wt%, more preferably higher than 90wt%.
In the present invention, the iron mine and the mass ratio of the binding agent are 100:(3～6), more preferably 100:(4～
5).In an embodiment of the present invention, the consumption of the binding agent can be according to SiO in pelletizing2Content determine, specifically, by institute
The content for stating Mg in binding agent is converted to the quality of magnesium oxide, in terms of the quality of magnesium oxide, the matter of magnesium oxide in the binding agent
Amount and SiO in pelletizing2Mass ratio be preferably (0.4～0.5):1, more preferably (0.44～0.46):1.
The present invention does not have special restriction to the equipment of the mixture, prepares pelletizing using well known to those skilled in the art
The mixing equipment adopted during ore deposit, such as can carry out dispensing on proportioning belt.
Iron mine is preferably mixed by the present invention with the mixed material and water of binding agent, obtains pelletizing raw material.In the present invention, institute
The water content for stating pelletizing raw material is preferably less than 9wt%, more preferably 8wt%～8.5wt%.
After obtaining pelletizing raw material, the pelletizing raw material balling-up is obtained green-ball by the present invention.Side of the present invention to the balling-up
Method does not have special restriction, using the balling-up technical scheme adopted in pellet preparation technology well known to those skilled in the art i.e.
Can.Specifically the pelletizing raw material can be placed in pelletizing in pelletizer.The present invention is not special to the species of the pelletizer
Restriction, using pelletizer well known to those skilled in the art, can such as be pelletising drum, can also be disk pelletizing
Machine.
In the present invention, the particle diameter of the green-ball is preferably 9mm～16mm；Diameter ＜ 5mm and diameter ＞ that balling-up is obtained
The feed powder of 16mm preferably carries out green-ball crushing, and pelletizing, screening, make green-ball again.In the present invention, the moisture of the green-ball contains
Measure preferred ＜ 10wt%, more preferably 9.0wt%～9.5wt%.
In the present invention, the process of the balling-up preferably includes that mother bulb is formed, green-ball grows up and compacting process.In the present invention
In, the time of the balling-up is preferably 10min～15min, most preferably more preferably 11min～13min, 12min.Specifically
, in the present invention, the time that the mother bulb is formed presses preferably 2min～4min, more preferably 2.5min～3.5min, most
Preferably 3min；The time that the green-ball is grown up is preferably 5min～7min, more preferably 5.5min～6.5min, most preferably
6min；The time of the compacting process is preferably 2min～4min, most preferably more preferably 2.5min～3.5min, 3min.
After obtaining green-ball, the green-ball is preferably carried out roasting by the present invention, obtains pellet finished product.In the present invention, institute
The temperature for stating roasting is preferably 1200 DEG C～1320 DEG C, more preferably 1250 DEG C～1300 DEG C, most preferably 1270 DEG C；The roasting
12 minutes～14 minutes time of burning.The present invention does not have special restriction to the equipment that the roasting is used, using this area skill
The roasting apparatus adopted during pellet is prepared known to art personnel, belt machine roasting apparatus can be such as adopted, or
Grate kiln roasting apparatus.
The performance of the green-ball and pellet to obtaining of the invention is tested, specifically：Device is determined using green pellet cracking
Carry out green pellet cracking performance test, it is desirable to burst temperature >=300 DEG C；
Intensity test, resistance to compression >=12N/ ball are carried out using compression strength of green pel let testing machine to green-ball；
Performance is fallen to green-ball using green-ball drop detector to test, height of fall is 0.5m, drop number >=4
It is secondary.
The invention provides a kind of binding agent for pellet, is prepared as binding agent using bentonite with prior art
The technical scheme of pellet is compared, and the binding agent that the present invention is provided is used for the preparation of pellet, and the pellet ore reduction for obtaining is swollen
Swollen rate declines, and effectively increases the quality of pellet.
And, containing Mg in the binding agent that the present invention is provided, the matched sintering deposit for using need not add magnesium oxide again,
Feed grade is improve, test result indicate that, the binding agent provided using the present invention can improve feed grade 0.09%；And,
The binding agent provided using the present invention prepares pellet to be had good economic benefit and reduces discharging benefit, the raising of feed grade,
Can increase production, tar reduction, and save the use of the magnesium oxide of sintering deposit；The discharge capacity and CO of slag can also be reduced2Row
High-volume.
Direct economy effect：
After binding agent of the pelletizing using present invention offer, grade of sinter improves 0.13%, sintering deposit ratio in blast furnace burden
Example improves blast furnace feeding grade 0.09% based on 70%, then, and rule of thumb formula blast furnace feeding grade improves 1%, increases production 2%,
Tar reduction 3%.The expense of ton ferropexy at present is 150 yuan, and comprehensive coke price is 1150 yuan/ton, and ton ferrum comprehensive coke ratio is 490kg/
T, then ton ferrum benefit be：
(1) yield increase effect
150- [1 ÷ (1+0.09 × 1 × 2%)] × 100=0.270 yuan/ton
(2) tar reduction benefit
(490 ÷ 1000) × 0.09 × 3% × 1150=1.523 yuan/ton
(3) blast furnace year economic benefit
Produce 2,100,000 tons of pellet belt pelletizing year, current ton iron mine consumption is 1.62, and pellet ratio is 30%, then ton
Ferrum consumes 0.486,2,100,000 tons of pellets of pellet and can produce 432.1 ten thousand tons of pig iron, and the volume increase tar reduction benefit of the pig iron is：
432.1 × (0.270+1.523)=774.76 ten thousand yuan/year；
(4) sintering deposit reduces the magnesite expense reduction after magnesite consumption
After due to binding agent of the pelletizing using present invention offer, magnesite powder is disabled, magnesite powder price is 85 yuan/ton (containing fortune
Take valency of getting home), it is 4,900,000 tons that 2,100,000 tons of pelletizings need adapted sintering deposit, 16 kg/ton of sintering deposits of sintering deposit magnesite unit consumption, its
Annual cost is：
85 × 490 × 16 ÷ 1000=666.4, ten thousand yuan/year；
(5) the cost change that the binding agent provided using the present invention is brought
The bentonite unit price for now using is 351 yuan/ton, and the binding agent that the present invention is provided is 230 yuan/ton, two kinds of binding agents
Unit consumption is respectively 14.0 kg/ton of pellets and 40 kg/ton of pellets, and pelletizing cost situation of change 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) year comprehensive income is：
774.76+666.4-900.06=541.1 ten thousand yuan/year.
Reduce discharging benefit
Reduce blast furnace slag discharge capacity：
The pellet of belt pelletizing year production at present is 2,100,000 tons, needs bentonite amount year for 2.24 ten thousand tons, using the present invention
After the binding agent of offer, 2.24 ten thousand tons of young use bentonite.In bentonite, the composition of about 60wt% is SiO2, the basicity of blast furnace slag
For 1.4 or so, the SiO in bentonite is neutralized2Must the amount of CaO of addition be：
Ten thousand tons of 2.24 × 60% × 1.4=1.88；
The blast furnace quantity of slag of reduction is：
Ten thousand tons of 2.24 × 60%+1.88=3.22；
Blast furnace slag can be reduced discharging year for 3.22 ten thousand tons.
Reduce greenhouse gases CO2Discharge capacity：
As CaO is that decomposition of limestone gets, according to calculating, produce 1 ton of CaO and will produce 0.44 ton of CO2Discharge
Amount, then as the few bentonite of belt pelletizing causes few CaO in blast furnace slag to measure as 1.88 ten thousand tons, then reduce decomposition of limestone in year
CO2Discharge capacity be：
Ten thousand tons of 1.88 × 0.786=0.83；
Reduce the less CO of comprehensive coke ratio2Discharge capacity：
According to calculating, 1 ton of carbon burns completely and will produce 3.67 tons of CO2, because of the carbon that the rising of feed grade, ton ferrum are reduced
Measure and be：
(490 ÷ 1000) × 0.09 × 3%=0.0013 tons/ton ferrum；
2100000 tons of ball ore deposits can produce 432.1 ten thousand tons of pig iron, then the carbon amounts for reducing is：
Ten thousand tons of 432.1 × 0.0013=0.572；
The CO of reduction2Discharge capacity is
Ten thousand tons of 0.572 × 3.67=2.10；
Year reduces greenhouse gases CO2Discharge capacity be：
Ten thousand tons of 0.83+2.10=2.93.
According to the above analysis, 541.1 ten thousand yuan of direct economic benefit can be produced every year, can reduce 2.93 ten thousand tons every year
CO2Discharge, can reduce by 3.22 ten thousand tons of blast furnace slag discharge capacity every year.
In order to further illustrate the present invention, with reference to embodiment to the binding agent provided by the present invention for pellet and
The preparation method of pellet is described in detail, but they can not be 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 embodiments 3～6, iron ore concentrate adopts the physical and chemical index of bloodstone and magnetic iron ore, bloodstone and magnetic iron ore
As shown in table 1：
The physical and chemical index of the iron ore concentrate that 1 embodiment of the present invention of table is adopted
Following testing equipment is adopted in following embodiments：Disc balling machine：Φ1000×200；Green pellet cracking determines device：
Φ500×1000；Compression strength of green pel let testing machine：WKD-10(20N)；Green-ball drop detector：0.5m；Sai Duolisi moisture
Instrument：MA30-000V3。
Embodiment 1
96wt%, granularity are passed through stirring, mixed less than the vegetable protein glue of the magnesite stone powder and 4wt% of 0.2mm, is obtained
For the binding agent of pellet.
Embodiment 2
94wt%, granularity are passed through stirring, mixed less than the vegetable protein glue of the magnesite stone powder and 6wt% of 0.2mm, is obtained
For the binding agent of pellet.
Embodiment 3
The binding agent 4wt% handss that the magnetic iron ore of 67wt%, the bloodstone of 29wt% and 4wt% embodiments 1 are prepared
Work mixes material, and material is mixed；Add water in material so that moisture is 8.0wt%, obtain balling-up material；
Balling-up material is placed in disc balling machine carries out pelletizing, and the balling-up time is 12min, wherein：Mother bulb forms the time
For 3min, green-ball grows up the time for 6min, and the closely knit time is 3min；
The present invention to green-ball resistance to compression, fall, burst temperature is detected, it is desirable to：Resistance to compression >=12N/ ball；Fall >=4 times；
Burst temperature >=300 DEG C；
Oven test is carried out using electric tube furnace, sintering temperature is 1270 DEG C, and carry out materialization and hot index analysis, knot
As shown in table 2, table 2 is the performance test results of the green-ball that the embodiment of the present invention 3～6 and comparative example 1 are obtained to fruit.
The finished ball for obtaining is carried out chemical composition analysis and hot index test, as a result as shown in table 3, table 3 by the present invention
The test result of the finished ball obtained for the embodiment of the present invention 3～6 and comparative example 1.
Embodiment 4
Pellet is prepared using the technical scheme of embodiment 3, except for the difference that, the binding agent that the present embodiment is adopted is for embodiment
2 binding agents for preparing, the mass content of binding agent is 4wt%；The mass content of magnetic iron ore be 67wt%, the matter of bloodstone
Amount content is 28wt%..
The present invention is tested to the performance of the green-ball that obtains and finished ball using the method for testing of embodiment 3, as a result such as
Shown in table 2 and table 3, table 2 is the performance test results of the green-ball that the embodiment of the present invention 3～6 and comparative example 1 are obtained, and table 3 is this
The test result of the finished ball that bright embodiment 3～6 and comparative example 1 are obtained.
Embodiment 5
Pellet is prepared using the technical scheme of embodiment 3, except for the difference that, the mass content of binding agent is in the present embodiment
5wt%, the mass content of magnetic iron ore is 67wt%, and the mass content of bloodstone is 28wt%.
The present invention is tested to the performance of the green-ball that obtains and finished ball using the method for testing of embodiment 3, as a result such as
Shown in table 2 and table 3, table 2 is the performance test results of the green-ball that the embodiment of the present invention 3～6 and comparative example 1 are obtained, and table 3 is this
The test result of the finished ball that bright embodiment 4～7 and comparative example 1 are obtained.
Embodiment 6
Pellet is prepared using the technical scheme of embodiment 3, except for the difference that, the binding agent that the present embodiment is adopted is for embodiment
2 binding agents for preparing, the mass content of binding agent is 5wt%, and the mass content of magnetic iron ore is 67wt%, the matter of bloodstone
Amount content is 28wt%.
The present invention is tested to the performance of the green-ball that obtains and finished ball using the method for testing of embodiment 3, as a result such as
Shown in table 2 and table 3, table 2 is the performance test results of the green-ball that the embodiment of the present invention 3～6 and comparative example 1 are obtained, and table 3 is this
The test result of the finished ball that bright embodiment 3～6 and comparative example 1 are obtained.
Comparative example 1
Pellet is prepared using the technical scheme of embodiment 3, except for the difference that, in this comparative example, binding agent is bentonite, glued
The mass content of knot agent is 2.1wt%, and the mass content of magnetic iron ore is 68wt%, and the mass content of bloodstone is 29.9wt%.
The present invention is tested to the performance of the green-ball that obtains and finished ball using the method for testing of embodiment 4, as a result such as
Shown in table 2 and table 3, table 2 is the performance test results of the green-ball that the embodiment of the present invention 3～6 and comparative example 1 are obtained, and table 3 is this
The test result of the finished ball that bright embodiment 3～6 and comparative example 1 are obtained.
The performance test results of the green-ball that 2 embodiment of the present invention 3～6 of table and comparative example 1 are obtained
As can be seen from Table 2：Using the present invention provide binding agent after, every physical index of the green-ball for preparing with
Hot index is obtained for improvement.
. the test result of the finished ball that 3 embodiment of the present invention 3～6 of table and comparative example 1 are obtained
Note：RDI is pelletizing low temperature reduction degradation index.
As can be seen from Table 3, due to using after the binding agent that the present invention is provided, content of MgO increases, and makes matched use
Sintering deposit in without the need for adding magnesium oxide again, its grade can improve 0.13%, equivalent to improving feed grade 0.09%；Using this
The binding agent that invention is provided prepares pellet, and after sintering deposit disables magnesite, its quality can be greatly improved；Carried using the present invention
For binding agent prepare pellet, its reduction swellability rate reduces 6%, effectively increases pellet quality.
As seen from the above embodiment, the invention provides the binding agent for pellet include following components：76wt%
The material containing magnesium of～98wt%；The calcareous material of 1wt%～10wt%, the vegetable protein glue of 1wt%～15wt%.With existing skill
Art is compared as the technical scheme that binding agent prepares pellet using bentonite, and the binding agent that the present invention is provided is used for pellet
Preparation, the pellet ore reduction swellability rate that obtains declines, test result indicate that, the reduction of the pellet that the present invention is prepared is swollen
Swollen rate reduces 6%, effectively increases the quality of pellet.
And, contain Mg in the binding agent that the present invention is provided, without the need for the magnesium oxide for adding again in sintering deposit, improve into stove
Grade, test result indicate that, the binding agent provided using the present invention can improve feed grade 0.09%；And, using the present invention
The binding agent of offer prepares pellet to be had good economic benefit and reduces discharging benefit, and the raising of feed grade can be increased production, drop
Jiao, and save the use of the magnesium oxide of sintering deposit；The discharge capacity and CO of slag can also be reduced2Discharge capacity.Experiment knot
Fruit shows, is applied in the pelletizing plant that pelletizing production ability is 2,100,000 tons/year that overall economic efficiency was 541.1 ten thousand in its year
Unit/year, can reduce discharging 3.22 ten thousand tons/year of blast furnace slag, it is possible to decrease CO22.93 ten thousand tons/year of discharge capacity.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of binding agent for pellet, composed of the following components：
The magnesite of 94wt%～96wt%；
The vegetable protein glue of 4wt%～6wt%；
The magnesite is powdery；The particle diameter of the magnesite is less than 0.2mm.
2. a kind of preparation method of pellet, comprises the following steps：
By iron mine and the binding agent mixture described in claim 1, mixed material is obtained, the iron mine with the mass ratio of binding agent is
100:(3～6)；
By the mixed material balling-up, green-ball is obtained；
The green-ball is carried out into roasting, pellet finished product is obtained.
3. preparation method according to claim 2, it is characterised in that the iron mine is 100 with the mass ratio of binding agent:(4
～5).
4. preparation method according to claim 3, it is characterised in that water content 8.8wt% of the mixed material～
9.8wt%.
5. preparation method according to claim 2, it is characterised in that the time of the balling-up is 10min～15min.
6. preparation method according to claim 2, it is characterised in that the temperature of the roasting is 1200 DEG C～1320 DEG C.
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| CN201410526558.3A CN104263916B (en) | 2014-10-09 | 2014-10-09 | Adhesive for pellet and preparation method of pellet |
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| CN104263916B true CN104263916B (en) | 2017-04-12 |
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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 |
| CN115927843A (en) * | 2022-12-01 | 2023-04-07 | 中冶长天国际工程有限责任公司 | Low-temperature consolidated composite pellet, preparation method thereof and drying consolidation method |
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| CN101736148A (en) * | 2008-11-21 | 2010-06-16 | 刘贵堂 | Sintering-pelletizing additive, preparation method and application thereof |
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| CN1035481C (en) * | 1994-06-30 | 1997-07-23 | 潘金海 | Organic binder for metallurgy |
| CN1737170A (en) * | 2005-09-06 | 2006-02-22 | 季建梅 | Iron concentrate pelletization binder of calcium magnesium reaction type |
| CN100529003C (en) * | 2007-11-20 | 2009-08-19 | 湘潭市海森科技有限公司 | Binder adapted for production of cooled agglomerated pellet by using iron-bearing material |
| CN102373332A (en) * | 2010-08-17 | 2012-03-14 | 上海汉堂实业有限公司 | Ultra-micro magnesium carbonate pellet additive, preparation method thereof, and application thereof |
| WO2012040037A1 (en) * | 2010-09-20 | 2012-03-29 | State Of Oregon Acting By & Through The State Board Of Higher Edu. On Behalf Of Oregon State Univ. | Soy adhesives and composites made from the adhesives |
| CN101956066B (en) * | 2010-10-03 | 2012-02-01 | 马鞍山市金鑫建材有限公司 | Metallurgical pellet compound binding agent |
| CN102329953A (en) * | 2011-06-01 | 2012-01-25 | 刘贵堂 | Cellulose ether iron ore pellet complex additive as well as preparation method and application thereof |
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| 高效镁质添加剂用于铁矿球团的试验研究;李艳茹等;《钢铁》;20100531;17-19 * |
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