CN104232888A - Method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas - Google Patents
Method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas Download PDFInfo
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- CN104232888A CN104232888A CN201310247700.6A CN201310247700A CN104232888A CN 104232888 A CN104232888 A CN 104232888A CN 201310247700 A CN201310247700 A CN 201310247700A CN 104232888 A CN104232888 A CN 104232888A
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- converter gas
- dry method
- cooled agglomerated
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- precipitating dust
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Abstract
The invention discloses a method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas, and is mainly used for solving the technical problem that in the prior art, the cooled agglomerated pellets are limited in use due to high pulverization ratio in preparation of the cooled agglomerated pellets by using dry method electric fly ash of converter gas as well as the problem of high preparation cost. According to the method disclosed by the invention, a sodium polyacrylamide aqueous solution is added into the dry method electric fly ash of converter gas after slaking treatment to prepare the cooled agglomerated pellets, and in the smelting process of molten steel of the converter, the cooled agglomerated pellets which are used as a cold material are added into molten steel, so that the smelting cost of molten steel of an iron and steel enterprise is lowered, and large-scaled recycling of the dry method electric fly ash of converter gas is achieved.
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 converter gas dry method electro-precipitating dust manufactures the method for cooled agglomerated pellet.
Background technology
In prior art, converter gas wet treatment process and converter gas dry method electric dust-removing process are generally adopted to the Recovery Purifying of coal gas of converter, converter gas dry method electric dust-removing process is relative 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 significantly can reduce iron and steel enterprise.Prior art lacks the method effectively utilizing converter gas dry method electro-precipitating dust.
The China's treatment process of Shoudu Iron and Steel Co Jing Tang Steel Plant to converter gas dry method electro-precipitating dust converter gas dry method electro-precipitating dust and iron scale or fine ore is added bonding agent be more jointly pressed into pelletizing, and after then drying, rotary kiln uses.Its converter gas dry method electro-precipitating dust manufactures 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 manufactures is high, is about 20%, adds the high cooled agglomerated pellet of Pulverization ratio, can produce volume of smoke, contaminate environment, limit the utilization of cooled agglomerated pellet in converter smelting molten steel process.
Chinese Patent Application No. is a kind of method that CN201310083011.6 provides that converter gas dry method electro-precipitating dust manufactures cooled agglomerated pellet, but its manufacturing cost is higher, hinders applying of this technology.
Summary of the invention
The object of this invention is to provide a kind of converter gas dry method electro-precipitating dust and manufacture the method for cooled agglomerated pellet, mainly solve in prior art and make with converter gas dry method electro-precipitating dust that the Pulverization ratio that cooled agglomerated pellet exists is high, the technical problem of the higher restriction cooled agglomerated pellet use of manufacturing cost.
The technical solution used in the present invention is:
Converter gas dry method electro-precipitating dust manufactures a method for cooled agglomerated pellet, comprises the following steps:
A, digestion process is carried out to converter gas dry method electro-precipitating dust, the quality of the water added 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;
Carry out stirring after adding bonding agent polyacrylamide sodium water solution in b, converter gas dry method electro-precipitating dust after digestion process and form uniform compound, the mass percent of mixing component is: converter gas dry method electro-precipitating dust 85.1 ~ 88.5%, polyacrylamide sodium water solution 5.3 ~ 7.5%, water 4.4 ~ 8.5%.
C, by high pressure double-roll type ball press, the compound formed in step b is pressed into the pelletizing that physical dimension is 50 × 50 × 40mm;
In d, environment that the pelletizing be pressed into is ventilated in drying maintenance 11.5 ~ 12.5 days qualified cooled agglomerated pellet.
Further, should be appropriate as the addition of the polyacrylamide sodium water solution of bonding agent in step b of the present invention, too high easily giving in cooled agglomerated pellet brings a large amount of moisture, and during use, dust is comparatively large, and too low, do not have the effect of bonding, the Pulverization ratio of cooled agglomerated pellet is high; Through test, when the addition of polyacrylamide sodium water solution of the present invention is 6.3 ~ 6.5%, the over-all properties of cooled agglomerated pellet and manufacturing cost are good.
Again, in step b of the present invention, polyacrylamide sodium water solution is added water by polyacrylamide sodium reagent to be made into, and tests through up to a hundred groups, and applicant finds that concentration is not less than 12% polyacrylamide sodium water solution and can realizes object of the present invention preferably unexpectedly; Concentration is 12% polyacrylamide sodium water solution than Chinese Patent Application No. is that bonding agent per ton cost disclosed in CN201310083011.6 is low nearly 1000 yuan, two kinds of bonding agents are suitable to the bond effect of converter gas dry method electro-precipitating dust, therefore production cost of the present invention is lower.
The Pulverization ratio of the cooled agglomerated pellet described in the present invention, refer to finished product cooled agglomerated pellet from 1.8 meters of height freely falling bodies to thickness 10mm with upper yield strength be 235MPa common carbon steel board, the quality of the particle diameter measured≤10mm part accounts for the per-cent of test gross weight.
A kind of converter gas dry method electro-precipitating dust disclosed by the invention manufactures the method for cooled agglomerated pellet, cooled agglomerated pellet is made by adding certain bonding agent at converter gas dry method electro-precipitating dust, add in molten steel as cold burden in converter molten steel smelting process, the recycle of metallic element in converter gas dry method electro-precipitating dust, reduces the smelting cost of iron and steel enterprise's molten steel.
The present invention has following positively effect compared to existing technology:
1. polyacrylamide sodium water solution of the present invention is as bonding agent, the Pulverization ratio of the cooled agglomerated pellet made is lower than 5%, cooled agglomerated pellet is as the cold burden in converter molten steel smelting process, can add in molten steel in a large number, decrease the consumption of steel scrap, unslaked lime in converter molten steel smelting process, ton steel production cost reduces by more than 0.4 yuan, and be in CN201310083011.6 compared with disclosed technology with Chinese Patent Application No., manufacturing cost reduces by 50 yuan/ton.
2. present invention achieves 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 efficiency utilization provide a kind of Technology Ways.
Embodiment
Below in conjunction with embodiment, illustrate the present invention further, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
A kind of converter gas dry method electro-precipitating dust disclosed by the invention manufactures the method for cooled agglomerated pellet, comprises the following steps:
A, carry out digestion process to converter gas dry method electro-precipitating dust, the quality of the water added in digestion process is 8 ~ 12% of converter gas dry method electro-precipitating dust quality, and digestion time is 14.5 ~ 15.5 hours;
Adding concentration in b, converter gas dry method electro-precipitating dust after digestion process is carry out stirring after 12% polyacrylamide sodium water solution to form uniform compound, the mass percent of mixing component is: converter gas dry method electro-precipitating dust 85.1 ~ 88.5%, polyacrylamide sodium water solution 5.3 ~ 7.5%, water 4.4 ~ 8.5%.
C, be that the compound formed in step b is pressed into the pelletizing that physical dimension is 50 × 50 × 40mm by the high pressure double-roll type ball press of GSJ-450 by model;
In d, environment that the pelletizing be pressed into is ventilated in drying 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 manufactures the method for cooled agglomerated pellet, utilizes the method embodiment 1 ~ 5, is originally respectively 0.51,0.53,0.52,0.47,0.48 yuan for Per Ton of Steel Production In Pangang Group Chengdu I & s Co. ltd falls.
This inventive method achieve metal in a kind of low cost converter gas dry method electro-precipitating dust recovery and extensive efficiency utilization, manufacturing cost is reduced simultaneously, also reduces the smelting molten steel cost of iron and steel enterprise.
Claims (3)
1. manufacture a method for cooled agglomerated pellet with converter gas dry method electro-precipitating dust, it is characterized in that, the method that described converter gas dry method electro-precipitating dust manufactures cooled agglomerated pellet comprises the following steps:
A, carry out digestion process to converter gas dry method electro-precipitating dust, the quality of the water added in digestion process is 8 ~ 12% of converter gas dry method electro-precipitating dust quality, and digestion time is 14.5 ~ 15.5 hours;
Carry out stirring after adding bonding agent polyacrylamide sodium water solution in b, converter gas dry method electro-precipitating dust after digestion process and form uniform compound, the mass percent of mixing component is: converter gas dry method electro-precipitating dust 85.1 ~ 88.5%, polyacrylamide sodium water solution 5.3 ~ 7.5%, water 4.4 ~ 8.5%.
C, by high pressure double-roll type ball press, the compound formed in step b is pressed into the pelletizing that physical dimension is 50 × 50 × 40mm;
In d, environment that the pelletizing be pressed into is ventilated in drying maintenance 11.5 ~ 12.5 days qualified cooled agglomerated pellet.
2. a kind of converter gas dry method electro-precipitating dust as claimed in claim 1 manufactures the method for cooled agglomerated pellet, and it is characterized in that, in described step b, the concentration of polyacrylamide sodium water solution is not less than 12%.
3. a kind of converter gas dry method electro-precipitating dust as claimed in claim 1 manufactures the method for cooled agglomerated pellet, and it is characterized in that, in described step b, the mass percent of polyacrylamide sodium water solution in described compound is 6.3 ~ 6.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310247700.6A CN104232888A (en) | 2013-06-21 | 2013-06-21 | Method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310247700.6A CN104232888A (en) | 2013-06-21 | 2013-06-21 | Method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas |
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| CN104232888A true CN104232888A (en) | 2014-12-24 |
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| CN201310247700.6A Pending CN104232888A (en) | 2013-06-21 | 2013-06-21 | Method for preparing cooled agglomerated pellets by using dry method electric fly ash of converter gas |
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Cited By (3)
| 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 |
| CN110669921A (en) * | 2019-10-18 | 2020-01-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for resourcefully treating steelmaking secondary dedusting ash |
| 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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| CN86106532A (en) * | 1986-10-03 | 1987-11-11 | 冶金部建筑研究总院 | Acidic waste water treatment agent |
| WO2000039351A1 (en) * | 1998-12-23 | 2000-07-06 | L & C Steinmuller (Africa) (Proprietary) Limited | Eaf dust treatment by pelletising and fluidised-bed reduction |
| JP2008291331A (en) * | 2007-05-26 | 2008-12-04 | Jfe Steel Kk | Method for manufacturing zinc-containing dust agglomerate |
| CN102367499A (en) * | 2011-09-02 | 2012-03-07 | 北京首钢国际工程技术有限公司 | Technology for producing cold-bonded pellets from dust collected by converter dry dedusting |
| CN102978387A (en) * | 2012-11-22 | 2013-03-20 | 北京科大国泰能源环境工程技术有限公司 | Process for producing cold-bonded pellet by using fly ash in steel solid waste |
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| CN86106532A (en) * | 1986-10-03 | 1987-11-11 | 冶金部建筑研究总院 | Acidic waste water treatment agent |
| WO2000039351A1 (en) * | 1998-12-23 | 2000-07-06 | L & C Steinmuller (Africa) (Proprietary) Limited | Eaf dust treatment by pelletising and fluidised-bed reduction |
| JP2008291331A (en) * | 2007-05-26 | 2008-12-04 | Jfe Steel Kk | Method for manufacturing zinc-containing dust agglomerate |
| CN102367499A (en) * | 2011-09-02 | 2012-03-07 | 北京首钢国际工程技术有限公司 | Technology for producing cold-bonded pellets from dust collected by converter dry dedusting |
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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 |
| CN110669921A (en) * | 2019-10-18 | 2020-01-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for resourcefully treating steelmaking secondary dedusting ash |
| CN110669921B (en) * | 2019-10-18 | 2023-10-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | System and method for recycling steelmaking secondary dust removal ash |
| 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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Application publication date: 20141224 |
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