CN104046772A - Method for making cooled agglomerated pellets by use of converter gas dry-method electrostatic precipitator - Google Patents
Method for making cooled agglomerated pellets by use of converter gas dry-method electrostatic precipitator Download PDFInfo
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- CN104046772A CN104046772A CN201310083011.6A CN201310083011A CN104046772A CN 104046772 A CN104046772 A CN 104046772A CN 201310083011 A CN201310083011 A CN 201310083011A CN 104046772 A CN104046772 A CN 104046772A
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- converter gas
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Abstract
The invention discloses a method for making cooled agglomerated pellets by the use of converter gas dry-method electrostatic precipitator so as to mainly solve the technical problem in the prior art that cooled agglomerated pellets prepared from converter gas dry-method electrostatic precipitator have high pulverulent ratio and the use of cooled agglomerated pellets is limited. According to the invention, sodium bentonite and water glass are added into converter gas dry-method electrostatic precipitator which undergoes digestive treatment so as to prepare cooled agglomerated pellets. During the converter molten steel smelting process, the cooled agglomerated pellets which are used as a cold material are added into molten steel. Thus, smelting cost of molten steel in iron and steel enterprises is reduced, and large-scale cyclic utilization of the converter gas dry-method electrostatic precipitator is realized.
Description
Technical field
The present invention relates to a kind for the treatment of process of coal gas dust removal of converter ash, particularly a kind of method of manufacturing cooled agglomerated pellet with converter gas dry method electro-precipitating dust.
Background technology
In prior art, the purification of coal gas of converter is reclaimed to general converter gas wet treatment process and the converter gas dry method electric dust-removing process of adopting, converter gas dry method electric dust-removing process is with respect to converter gas wet treatment process, there is good dedusting effect, gas recovery is many, dust removal installation running maintenance is low, the advantage of water-saving economize on electricity, therefore widely applied by domestic and international iron and steel enterprise; In in converter gas dry method electro-precipitating dust, all iron content reaches 49～55%, makes good use of the smelting molten steel cost that converter gas dry method electro-precipitating dust can significantly reduce iron and steel enterprise.Prior art lacks the method for effectively utilizing converter gas dry method electro-precipitating dust.
China Shoudu Iron and Steel Co Jing Tang Steel Plant are converter gas dry method electro-precipitating dust to be added to bonding agent again with iron scale or fine ore be jointly pressed into pelletizing to the treatment process of converter gas dry method electro-precipitating dust, rotary kiln use after then drying.Its converter gas dry method electro-precipitating dust is manufactured cooled agglomerated pellet proportion scheme: converter gas dry method electro-precipitating dust 60～70%, iron scale or fine ore 10～15%, starch adesive 8～10% and water 12～15%.Cooled agglomerated pellet external diameter is respectively: 38mm, 26mm, 15mm, single ball intensity >=800N; The Pulverization ratio of the cooled agglomerated pellet that the method is manufactured is high, is about 20%, in converter smelting molten steel process, adds the cooled agglomerated pellet that Pulverization ratio is high, can produce volume of smoke, and contaminate environment, has limited the utilization of cooled agglomerated pellet.Prior art lacks the method for effectively utilizing converter gas dry method electro-precipitating dust.
Summary of the invention
The object of this invention is to provide a kind of method of using converter gas dry method electro-precipitating dust to manufacture cooled agglomerated pellet, mainly solve in prior art and make with converter gas dry method electro-precipitating dust the high technical problem that limits cooled agglomerated pellet use of Pulverization ratio that cooled agglomerated pellet exists.
The technical solution used in the present invention is:
A method of manufacturing cooled agglomerated pellet with converter gas dry method electro-precipitating dust, comprises the following steps:
A, converter gas dry method electro-precipitating dust is carried out to digestion process, the quality of the water adding in digestion process is 8～12% of converter gas dry method electro-precipitating dust quality, digestion time is 14.5～15.5 hours, makes calcium oxide in converter gas dry method electro-precipitating dust all be converted into calcium hydroxide;
After adding bonding agent sodium bentonite, water glass and water in b, the converter gas dry method electro-precipitating dust after digestion process, stir the uniform compound of formation, the mass percent of mixing component is: converter gas dry method electro-precipitating dust 85.1～88.5%, sodium bentonite 3.5～5.3%, water glass 1.8～2.2%, water 4.4～8.5%; In sodium bentonite, the mass percent of component is: silicon-dioxide 50～65%, aluminium sesquioxide 15～20%, magnesium oxide 3～4%, ferric oxide 2～4%, sodium oxide 3.5～4.3%;
C, by high pressure double-roll type ball press, the compound forming in step b is pressed into the pelletizing that physical dimension is 50 * 50 * 40mm;
D, by the pelletizing being pressed in the dry environment ventilating maintenance 11.5～12.5 days qualified cooled agglomerated pellet.
Further, in step b, the addition of bonding agent sodium bentonite should be appropriate, and too high easy giving in cooled agglomerated pellet brought a large amount of silicon, unfavorable to converter smelting low-silicon steel kind, the too low effect that does not have bonding, and the Pulverization ratio of cooled agglomerated pellet is high; Through test, the addition of sodium bentonite of the present invention is mixture quality 4.3%, and the Pulverization ratio of the cooled agglomerated pellet of making is minimum.
Again, in step b, the addition of bonding agent water glass should be appropriate, water glass main component is water glass, it is the bonding agent that a kind of price is relatively high, it can increase the early strength of cooled agglomerated pellet, prevent the efflorescence of cooled agglomerated pellet, water glass too high levels in cooled agglomerated pellet, can increase cooled agglomerated pellet production cost, and then cooled agglomerated pellet reduces utility value, in cooled agglomerated pellet, the Pulverization ratio of the too low pelletizing of water glass content can be higher, through test, the addition of water glass of the present invention is 2.1% of mixture quality, the Pulverization ratio of the cooled agglomerated pellet of making is minimum, manufacturing cost is minimum.
The Pulverization ratio of the cooled agglomerated pellet described in the present invention, refer to finished product cooled agglomerated pellet be take the common carbon steel board that upper yield strength is 235MPa to thickness 10mm from 1.8 meters of height freely falling bodies, the quality of the particle diameter of measuring≤10mm part accounts for the per-cent of test gross weight.
A kind of method of manufacturing cooled agglomerated pellet with converter gas dry method electro-precipitating dust disclosed by the invention, by adding certain bonding agent at converter gas dry method electro-precipitating dust, make cooled agglomerated pellet, in converter molten steel smelting process, as cold burden, add in molten steel, the recycle of metallic element in converter gas dry method electro-precipitating dust, has reduced the smelting cost of iron and steel enterprise's molten steel.
The present invention has following positively effect compared to existing technology:
1. the present invention adopts sodium bentonite, water glass as bonding agent, the Pulverization ratio of the cooled agglomerated pellet of making is lower than 5%, cooled agglomerated pellet is as the cold burden in converter molten steel smelting process, can add in a large number in molten steel, reduced the consumption of steel scrap, unslaked lime in converter molten steel smelting process, ton steel production cost reduces by 0.2 yuan.
2. the present invention has realized the recycle of converter gas dry method electro-precipitating dust, for the recovery of metal in converter gas dry method electro-precipitating dust and extensive efficient utilization provide a kind of Technology Ways.
Embodiment
Below in conjunction with embodiment, further illustrate the present invention, should understand following embodiment and only for the present invention is described, is not used in and limits the scope of the invention.
A kind of method of manufacturing cooled agglomerated pellet with converter gas dry method electro-precipitating dust disclosed by the invention, comprises the following steps:
A, converter gas dry method electro-precipitating dust is carried out to digestion process, the quality of the water adding in digestion process is 8～12% of converter gas dry method electro-precipitating dust quality, and digestion time is 14.5～15.5 hours;
After adding bonding agent sodium bentonite, water glass and water in b, the converter gas dry method electro-precipitating dust after digestion process, stir the uniform compound of formation, the mass percent of mixing component is: converter gas dry method electro-precipitating dust 85.1～88.5%, sodium bentonite 3.5～5.3%, water glass 1.8～2.2%, water 4.4～8.5%; In sodium bentonite, the mass percent of component is: silicon-dioxide 50～65%, aluminium sesquioxide 15～20%, magnesium oxide 3～4%, ferric oxide 2～4%, sodium oxide 3.5～4.3%;
C, the high pressure double-roll type ball press that is GSJ-450 by model are pressed into by the compound forming in step b the pelletizing that physical dimension is 50 * 50 * 40mm;
D, by the pelletizing being pressed in the dry environment ventilating maintenance 11.5～12.5 days qualified cooled agglomerated pellet.
The proportioning raw materials of embodiment as shown in table 1 and Pulverization ratio.
The proportioning raw materials of table 1 embodiment 1～5 and Pulverization ratio
A kind of converter gas dry method electro-precipitating dust disclosed by the invention is manufactured the method for cooled agglomerated pellet, utilizes the method embodiment 1～5, for Per Ton of Steel Production In Pangang Group Chengdu I & s Co. ltd falls, is originally respectively 0.45,0.43,0.53,0.40,0.22 yuan.
The realization of this inventive method in converter gas dry method electro-precipitating dust metal recovery and extensive efficient utilization, reduced the smelting molten steel cost of iron and steel enterprise simultaneously.
Claims (3)
1. with converter gas dry method electro-precipitating dust, manufacture a method for cooled agglomerated pellet, it is characterized in that, the described method with converter gas dry method electro-precipitating dust manufacture cooled agglomerated pellet comprises the following steps:
A, converter gas dry method electro-precipitating dust is carried out to digestion process, the quality of the water adding in digestion process is 8～12% of converter gas dry method electro-precipitating dust quality, and digestion time is 14.5～15.5 hours;
After adding bonding agent sodium bentonite, water glass and water in b, the converter gas dry method electro-precipitating dust after digestion process, stir the uniform compound of formation, the mass percent of mixing component is: converter gas dry method electro-precipitating dust 85.1～88.5%, sodium bentonite 3.5～5.3%, water glass 1.8～2.2%, water 4.4～8.5%; In sodium bentonite, the mass percent of component is: silicon-dioxide 50～65%, aluminium sesquioxide 15～20%, magnesium oxide 3～4%, ferric oxide 2～4%, sodium oxide 3.5～4.3%;
C, by high pressure double-roll type ball press, the compound forming in step b is pressed into the pelletizing that physical dimension is 50 * 50 * 40mm;
D, by the pelletizing being pressed in the dry environment ventilating maintenance 11.5～12.5 days qualified cooled agglomerated pellet.
2. a kind of method of manufacturing cooled agglomerated pellet with converter gas dry method electro-precipitating dust as claimed in claim 1, is characterized in that, in described step b, the addition of bonding agent sodium bentonite is mixture quality 4.3%.
3. a kind of method of manufacturing cooled agglomerated pellet with converter gas dry method electro-precipitating dust as claimed in claim 1, is characterized in that, in described step b, the addition of bonding agent water glass is mixture quality 2.1%.
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| CN201310083011.6A CN104046772B (en) | 2013-03-15 | 2013-03-15 | A kind of converter gas dry method electro-precipitating dust manufactures the method for cooled agglomerated pellet |
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| CN201310083011.6A CN104046772B (en) | 2013-03-15 | 2013-03-15 | A kind of converter gas dry method electro-precipitating dust manufactures the method for cooled agglomerated pellet |
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| CN104046772B CN104046772B (en) | 2016-12-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803190A (en) * | 2014-12-30 | 2016-07-27 | 上海梅山钢铁股份有限公司 | Method for preparing cold-bonded pellets of low water content by using dry method electrostatic precipitator dust of converter gas |
| CN108277342A (en) * | 2018-02-27 | 2018-07-13 | 首钢京唐钢铁联合有限责任公司 | A method of producing cooled agglomerated pellet |
| CN112429994A (en) * | 2020-12-11 | 2021-03-02 | 新疆中非夏子街膨润土有限责任公司 | Steel-making ash adhesive using sodium bentonite as main material and preparation method thereof |
| CN112725618A (en) * | 2020-12-25 | 2021-04-30 | 广西柳钢环保股份有限公司 | Special binder for converter dedusting cold-pressed pellets |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803190A (en) * | 2014-12-30 | 2016-07-27 | 上海梅山钢铁股份有限公司 | Method for preparing cold-bonded pellets of low water content by using dry method electrostatic precipitator dust of converter gas |
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| CN112429994A (en) * | 2020-12-11 | 2021-03-02 | 新疆中非夏子街膨润土有限责任公司 | Steel-making ash adhesive using sodium bentonite as main material and preparation method thereof |
| CN112725618A (en) * | 2020-12-25 | 2021-04-30 | 广西柳钢环保股份有限公司 | Special binder for converter dedusting cold-pressed pellets |
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| CN104046772B (en) | 2016-12-28 |
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