CN102337394A - Composition for fabricating pellets - Google Patents
Composition for fabricating pellets Download PDFInfo
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- CN102337394A CN102337394A CN2011102828959A CN201110282895A CN102337394A CN 102337394 A CN102337394 A CN 102337394A CN 2011102828959 A CN2011102828959 A CN 2011102828959A CN 201110282895 A CN201110282895 A CN 201110282895A CN 102337394 A CN102337394 A CN 102337394A
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- boron mud
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Abstract
The invention relates to a composition for fabricating pellets, which comprises boric sludge and cement. The composition can be fabricated by directly adopting boron or ferroboron tailing powder, namely the boric sludge; the pellets fabricated from wastes not only have low cost, the bonding performance of the pellets is improved simultaneously, and the stability and fluidity of slag are improved; especially in the process of smelting the pellets, no or a little magnesium powder and boron powder both with high price are necessary to prepare, therefore the smelting cost is further reduced.
Description
Technical field
The present invention relates to a kind of compsn that pelletizing is used of making.
Background technology
Pelletizing is the epigranular of being processed by breeze such as powdered iron ore, the globe with sufficient intensity.When making pelletizing, in breeze, add an amount of moisture and sticker earlier, be made into green-ball through pelletizer then, again green-ball is carried out roasting in oxidizing atmosphere after drying, the preheating, to process pelletizing or to be referred to as pellet.In iron and steel domain, pellet and agglomerate become important blast furnace burden equally, also are applicable to non-ferrous metal metallurgy simultaneously.
Because contain a certain amount of moisture in the green-ball, in drying process, the temperature of sintering green-ball is too high; Moisture content in the green-ball sees through steam and spreads from inside to outside; When steam too much has little time to be diffused into the green-ball surface, cause in the green-ball vp too high, and the vp in it is when surpassing dry surface layer radially with tangential tensile strength; Pelletizing will produce explosion, and the pelletizing structure is destroyed; If the temperature of sintering green-ball is low excessively, though the flow velocity of medium is slow, the green-ball that is dried is difficult for generation and breaks, and the output of this sintering processing is relatively low, and the cost of making pelletizing is improved.
In order to address the above problem; The mode that available technology adopting is added tackiness agent improve green-ball radially and tangential tensile strength; And tackiness agent to select wilkinite, slaked lime and organic binder bond etc., its meaning usually for use be to want to utilize the strong water-holding power of tackiness agent to slow down the rate of drying on pelletizing surface so that the steam in it through the surface to external diffusion; To reduce the vp in the green-ball, guarantee that pelletizing is not broken.Though this kind tackiness agent can improve the quality of pelletizing; But for the pelletizing made from ground hematite; In the process of smelting palletizing, require slag to have satisfactory stability property and flowability, and the stability of slag and flowing property depend primarily on contained magnesian amount in it; It does not contain in above-mentioned wilkinite, slaked lime and the organic binder bond or Natural manganese dioxide that content is less relatively, so can not improve the stability of slag and mobile; In addition, when smelting palletizing, because rhombohedral iron ore (red oxide of iron) is in being reduced into the process of Z 250; Its cubical expansivity about 25%; And above-mentioned tackiness agent can not suppress this " catastrophic expansion ", so in the prior art, adopts the mode of adding magnesium to solve the rate of expansion problem usually; Be called " a kind of slag is regulated feed composition; method of manufacture and the method for use in iron and steel " like Chinese patent 102061359A number disclosed name and just propose to add a large amount of magnesian teachings, but, can directly cause the raising of smelting cost because magnesian cost is higher.
Boron mud is that boron rock or paigeite are difficult for the further mine tailing of sorting again, utilizes it as the compsn of making pelletizing, is refuse reclamation on the one hand; Reducing the cost of pelletizing, is on the other hand in the process of smelting palletizing, owing to contain compositions such as Natural manganese dioxide, boron oxide and quicklime in the pelletizing; After pellets will; Natural manganese dioxide in the boron mud can improve the stable and mobile of slag, and need not extra interpolation when agglomerates of sintered pellets or add the magnesium powder of high price on a small quantity, to reduce smelting cost; Boron oxide in the boron mud can dissolve multiple MOX under molten state; And the formation basic oxide, to improve the quality of iron, the quicklime in the boron mud can play the effect of tackiness agent and oxygenant under the pellets will state.
For this reason; The name of Chinese patent 1153218A number bulletin is called the teachings that just proposes to utilize boron mud in " iron ore pellet compound additive "; But contain a spot of boron mud in this kind additive; Main raw material still adopts wilkinite, boric acid and cement, also is added with ethyloic-Mierocrystalline cellulose and feldspar simultaneously.Owing to generally believe in the prior art; In pelletizing, add 2% boron mud, can reduce the maturing temperature of pellet, and can also improve the intensity of pellet; But boron mud can reduce the burst temperature and the dry bulb intensity of green-ball; And then influence the performance of green-ball, so mistaken ideas of prior art are to add boron mud less as far as possible.
In addition, Chinese patent 88103362A number disclosed name is called " wet processing method of boron-lime mud podwer " and proposes a kind of additive of making pelletizing, adopts the boron mud of 50-55% and the unslaked lime of 45-50% in this kind additive; And Chinese patent 101613798A number disclosed name is called additive employing boron mud and the quicklime that " ironmaking additive and preparation method thereof " proposes, and weight ratio between the two is 60-120:5-40.Though the content of boron mud is relatively large in above-mentioned two kinds of additives,, when making pelletizing, only adopt this a kind of additive can reduce the burst temperature and the dry bulb intensity of green-ball really because the bond properties of unslaked lime (quicklime) is not really desirable; When smelting palletizing, pelletizing need freely fall in the blast furnace at several meters high position, and the process in falling into blast furnace simultaneously; Can collide each other and impact between the pelletizing, if the anti-pressure ability of pelletizing less than 2200 kilograms every square metre, it falls into degradation rate in the blast furnace greatly about about 30%; Cause its poor mobile performance, thereby increase the loss of the energy, and can influence the quality of iron and steel; Yet, all adopt unslaked lime as tackiness agent in above-mentioned two patents, because the bond properties of unslaked lime is relatively poor relatively; According to the pelletizing that said ratio is made, its anti-pressure ability is all less than 2200 kilograms every square metre; In addition, the bond properties difference of pelletizing also can influence its output, because pelletizer is in making the process of ball, its balling ratio is usually less than and is lower than 93%.
Summary of the invention
Task of the present invention provides a kind ofly to be utilized the mode that improves boron mud bond properties to solve pelletizing to be prone to produce the compsn that breaks with the making pelletizing of problem such as smelting cost height.
The compsn that making pelletizing proposed by the invention is used comprises the material of following weight percent: boron mud 80-98%, cement 2-20%.Generally contain Natural manganese dioxide 32-40% in the boron mud, boron oxide 2-3%, silica 1 5-25%; Full iron 5-15% adopts this waste of boron mud except that full iron capable of using, and Natural manganese dioxide wherein can improve the stable and mobile of slag; And need not extra interpolation when agglomerates of sintered pellets or add the magnesium powder of high price on a small quantity; And boron oxide wherein can dissolve multiple MOX under molten state, and forms basic oxide, to improve the quality of iron; Cement can increase on the one hand the hardness and the anti-pressure ability of green pellets, and balling ratio, on the other hand can desulfurization in iron manufacturing process, if the cement addition, can increase the cost of making pelletizing greater than 20%, and less than 2% can influence pelletizing intensity.
Said composition also comprises gypsum, and its weight percent is: boron mud 80-98%, cement 1-10%, gypsum 1-10%.Add gypsum in the pelletizing and can make its fast dewatering, to accelerate the hardness that balling-up speed also can also improve pelletizing, simultaneously, main chemical compositions is a calcium sulfate in the gypsum, can desiliconization in iron manufacturing process.
Said composition also comprises lime, and its weight percent is: boron mud 80-98%, cement 1-10%, lime 1-10%.Because the staple of lime is quicklime and Natural manganese dioxide, for the lower boron mud of content of magnesia, can add lime in right amount, to increase the flowability of pelletizing.
Said composition comprises the material of following weight percent: boron mud 80-98%, cement 1-10%, lime 0.5-4%, gypsum 0.5-6%.
The particle of boron mud, cement, lime and gypsum in the said composition is more than 320 orders.
It is boron mud and cement compatibility that the compsn of making pelletizing proposed by the invention can directly adopt boron or ferro-boron mine tailing, through detecting, adds the cement more than 2% in the said composition; Anti-pressure ability with the pelletizing of its making just can be greater than 2400 kilograms every square metre, and balling ratio is more than 95%, and when smelting palletizing; After rendering to it in blast furnace, only below 10%, degradation rate is almost nil for its percentage of damage; So, utilize depleted boron mud and cement to make pelletizing, can not only be with low cost; Do not need to be equipped with again or to be equipped with less the magnesium powder and the boron powder of high price, can also improve the bond properties of pelletizing simultaneously, and improve the stable and mobile of slag; In addition, gypsum and lime that said composition is added on the basis of boron mud and cement again can further improve the hardness and the flowability of pelletizing, and the effect that removes the gred.
Embodiment:
Embodiment 1:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 980Kg, cement 20Kg with grinding the particle more than 320 orders after boron mud and the cement mixing or grinding the particle remix more than 320 orders respectively, is compsn proposed by the invention.
Embodiment 2:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 900Kg, cement 100Kg processes compsn proposed by the invention according to the method for embodiment 1.5
Embodiment 3:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 800Kg, cement 200Kg processes compsn proposed by the invention according to the method for embodiment 1.
Embodiment 4:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 850Kg, cement 150Kg processes compsn proposed by the invention according to the method for embodiment 1.
Embodiment 5:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used; Get boron mud 980Kg, cement 10Kg, gypsum 10Kg; With grinding the particle more than 320 orders or grind the particle remix more than 320 orders respectively after boron mud and cement and the gypsum mixing, be compsn proposed by the invention.
Embodiment 6:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 800Kg, cement 100Kg, gypsum 100Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 7:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 850Kg, cement 100Kg, gypsum 50Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 8:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 900Kg, cement 50Kg, gypsum 50Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 9:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 820Kg, cement 80Kg, gypsum 80Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 10:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used; Get boron mud 980Kg, cement 10Kg, lime 10Kg; With grinding the particle more than 320 orders or grind the particle remix more than 320 orders respectively after boron mud and cement and the gypsum mixing, be compsn proposed by the invention.
Embodiment 11:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 800Kg, cement 100Kg, lime 100Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 12:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 850Kg, cement 100Kg, lime 50Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 13:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 900Kg, cement 50Kg, lime 50Kg processes compsn proposed by the invention according to the method for embodiment 5
Embodiment 14:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 820Kg, cement 80Kg, lime 80Kg processes compsn proposed by the invention according to the method for embodiment 5.
Embodiment 15:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used; Get boron mud 980Kg; Cement 10Kg, lime 5Kg, gypsum 5Kg; Boron mud, cement, gypsum and lime are mixed the back grind the particle more than 320 orders or grind the particle remix more than 320 orders respectively, be compsn proposed by the invention.
Embodiment 16:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 900Kg, cement 50Kg, lime 20Kg, gypsum 30Kg processes compsn proposed by the invention according to the method for embodiment 15.
Embodiment 17:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 800Kg, cement 100Kg, lime 40Kg, gypsum 60Kg processes compsn proposed by the invention according to the method for embodiment 15.
Embodiment 18:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 850Kg, cement 60Kg, lime 30Kg, gypsum 60Kg processes compsn proposed by the invention according to the method for embodiment 15.
Embodiment 18:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 820Kg, cement 120Kg, lime 20Kg, gypsum 40Kg processes compsn proposed by the invention according to the method for embodiment 15.
Embodiment 19:
Produce the compsn that 1000Kg making pelletizing proposed by the invention is used, get boron mud 820Kg, cement 130Kg, lime 25Kg, gypsum 45Kg processes compsn proposed by the invention according to the method for embodiment 15.
When utilizing the compsn described in the foregoing description 1 to 19 to make green pellets, can said composition and breeze such as powdered iron ore directly be mixed the back and make according to prior art.
Claims (7)
1. make the compsn that pelletizing is used, it is characterized in that: said composition comprises the material of following weight percent: boron mud 80-98%, cement 2-20%.
2. compsn according to claim 1 is characterized in that: said composition also comprises gypsum.
3. compsn according to claim 2 is characterized in that: said composition comprises the material of following weight percent: boron mud 80-98%, cement 1-10%, gypsum 1-10%.
4. compsn according to claim 1 and 2 is characterized in that: said composition also comprises lime.
5. compsn according to claim 4 is characterized in that: said composition comprises the material of following weight percent: boron mud 80-98%, cement 1-10%, lime 1-10%.
6. compsn according to claim 4 is characterized in that: said composition comprises the material of following weight percent: boron mud 80-98%, cement 1-10%, lime 0.5-4%, gypsum 0.5-6%.
7. compsn according to claim 6 is characterized in that: the particle of boron mud, cement, lime and gypsum in the said composition is more than 320 orders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102828959A CN102337394A (en) | 2011-09-22 | 2011-09-22 | Composition for fabricating pellets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102828959A CN102337394A (en) | 2011-09-22 | 2011-09-22 | Composition for fabricating pellets |
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| Publication Number | Publication Date |
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| CN102337394A true CN102337394A (en) | 2012-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102828959A Pending CN102337394A (en) | 2011-09-22 | 2011-09-22 | Composition for fabricating pellets |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676799A (en) * | 2012-03-30 | 2012-09-19 | 东北大学 | Preparation method for boron-magnesium composite additive for pellets and product |
| CN104975171A (en) * | 2015-05-28 | 2015-10-14 | 营口市林合茂科技开发有限公司 | Boric sludge pellet binder/iron smelting auxiliary and preparation method of boric sludge pellet binder/iron smelting auxiliary |
| CN105219956A (en) * | 2015-10-30 | 2016-01-06 | 兰州大学 | A kind of preparation method of iron powder coal-pressing ball compound binding agent |
| CN106834574A (en) * | 2017-02-24 | 2017-06-13 | 本钢板材股份有限公司 | One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153218A (en) * | 1995-12-27 | 1997-07-02 | 北京科技大学 | Iron ore pellet compound additive |
| CN1351179A (en) * | 2000-10-30 | 2002-05-29 | 马钢江东企业公司金属制品厂 | Process for sphericizing broken agglomerate |
-
2011
- 2011-09-22 CN CN2011102828959A patent/CN102337394A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1153218A (en) * | 1995-12-27 | 1997-07-02 | 北京科技大学 | Iron ore pellet compound additive |
| CN1351179A (en) * | 2000-10-30 | 2002-05-29 | 马钢江东企业公司金属制品厂 | Process for sphericizing broken agglomerate |
Non-Patent Citations (2)
| Title |
|---|
| 王子鸣等: "提高本钢球团厂生球质量的实践", 《本钢技术》, no. 5, 31 May 2010 (2010-05-31), pages 9 - 12 * |
| 田昕等: "金属尾矿渣大量利用的适用技术", 《砖瓦》, no. 5, 31 May 2011 (2011-05-31), pages 24 - 1 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102676799A (en) * | 2012-03-30 | 2012-09-19 | 东北大学 | Preparation method for boron-magnesium composite additive for pellets and product |
| CN102676799B (en) * | 2012-03-30 | 2014-05-28 | 东北大学 | Preparation method for boron-magnesium composite additive for pellets and product |
| CN104975171A (en) * | 2015-05-28 | 2015-10-14 | 营口市林合茂科技开发有限公司 | Boric sludge pellet binder/iron smelting auxiliary and preparation method of boric sludge pellet binder/iron smelting auxiliary |
| CN105219956A (en) * | 2015-10-30 | 2016-01-06 | 兰州大学 | A kind of preparation method of iron powder coal-pressing ball compound binding agent |
| CN106834574A (en) * | 2017-02-24 | 2017-06-13 | 本钢板材股份有限公司 | One kind is colded pressing boracic pelletizing blast furnace prepurging solvent and its preparation, application method |
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Application publication date: 20120201 |