CN101691621B - Method of producing sponge iron from carbon dedusting ash and iron scales - Google Patents
Method of producing sponge iron from carbon dedusting ash and iron scales Download PDFInfo
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- CN101691621B CN101691621B CN2009100754351A CN200910075435A CN101691621B CN 101691621 B CN101691621 B CN 101691621B CN 2009100754351 A CN2009100754351 A CN 2009100754351A CN 200910075435 A CN200910075435 A CN 200910075435A CN 101691621 B CN101691621 B CN 101691621B
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Abstract
The invention relates to method of producing sponge iron from carbon dedusting ash and iron scaless, comprising the following steps: (1) stirring evenly the raw materials including 1-50 portions of dust of blast furnace gas dust by mass, 1-20 portions of the carbon dedusting ash and 30-80 portions of iron scales, and adding and stirring 1-15 portions of water by mass and 1-5 portions of agglomerant by mass to the raw materials; (2) pressing the mixture into balls, and baking or airing the balls; (3) spreading the balls on a tunnel kiln bogie, spreading a layer of coke on the surfaces of the balls, keeping the balls at 1200+/-100 DEG C for 12+/-1h, cooling the balls into the sponge iron, and moving the sponge iron out of the tunnel kiln; and (4) separating the surface of the sponge iron, spreading coke powder on the sponge iron and putting the finished sponge iron which contains more than 90 percent of TFe in the storage, wherein in the step (1), less than 20 portions of coke powder by mass can be added to the mixture. The method of producing the sponge iron from the carbon dedusting ash and the iron scaless has low cost and high efficiency.
Description
Technical field
The present invention relates to a kind of method of utilizing dedusting ash and iron scale to produce sponge iron, specifically is a kind of method of utilizing of utilizing carbon dedusting ash and iron scale to make sponge iron.
Background technology
In recent years, country greatly develops recycling economy, energy-saving and emission-reduction, but along with the fast development of China's metallurgical industry, iron and steel output grows steadily, and associated resources increases thereupon, as iron scale, dedusting ash etc., as effectively not utilizing, not only can waste ample resources, also can pollute causing serious environmental.Therefore, these resources of research and utilization have just become to press for the problem of solution.For general carbon dedusting ash, major part enters sintering plant, carry out sintering, but owing to contain alkali metals such as a large amount of K, Na, Zn in the part dedusting ash (as blast furnace dust, converter dust-removing ash), can reduce sinter quality if enter sintering, especially alkali metals such as K, Na, Zn enter blast furnace, can quicken other disadvantageous effects such as blast furnace lining corroding, thereby reduce blast furnace work-ing life.At present, most of production sponge iron reductive agent is a coke powder, and the production cycle is long, and the cost height is to improve the sponge iron economic benefit, is badly in need of reducing its production cost.Therefore, research improves carbon dedusting ash, iron scale utilising efficiency, reduces sponge iron and produces the low-cost extremely urgent problem that just becomes.
Summary of the invention
In order to overcome the existing above-mentioned deficiency of utilizing carbon dedusting ash and iron scale to produce the method for sponge iron, the invention provides the method for utilizing carbon dedusting ash and iron scale to produce sponge iron that a kind of cost is low, efficient is high.
This method of utilizing carbon dedusting ash and iron scale to produce sponge iron comprises following sequential steps:
(1) batch mixing
Blast furnace dust, carbon dedusting ash and iron scale are stirred by following proportion by weight:
Blast furnace dust 1～50 carbon dedusting ash 1～20 iron scale 30～80
And then add the water of proportion by weight 1～15 and 1～5 binding agent, mix.Binding agent is a humic acid.
(2) pressure ball
After above-mentioned material mixing, send into the pair roller ball press with belt, under 10MPa～200MPa pressure, be squeezed into pressure ball, spherical diameter is 30～50mm, pressure ball oven dry or natural air drying.
(3) going into kiln smelts
Pressure ball is tiled on the tunnel furnace chassis, layer thickness is 500mm～700mm, be generally 600mm, at the coke of pressure ball top layer tiling thickness 40mm～60mm, be generally the coke of 50mm, under 1200 ℃ ± 100 ℃ conditions, insulation 12h ± 1h, cooling 6h ± 1h generally is cooled to i.e. 400 ℃ ± 100 ℃ one-tenth sponge iron, kiln discharge.
(4) finished product warehouse-in
The sponge iron screening of kiln discharge is separated top layer tiling coke powder, promptly get the sponge iron finished product of TFe＞90%, warehouse-in.
This method of utilizing dedusting ash and iron scale production sponge iron can add coke powder≤20, the granularity≤3mm of coke powder in step () batch mixing.
The method that this utilizes carbon dedusting ash and iron scale to produce sponge iron, promptly utilizing blast furnace dust (1%～50%) to substitute the part coke powder is reductive agent, recycles wherein Fe and carbon dust.Make full use of blast furnace dust and contained the C height, efficiently utilize carbon dedusting ash, reduced required coke powder of production sponge iron and iron scale, reduced production sponge iron raw materials cost, improved sponge iron production efficiency and metallurgical wasted resources efficient.Shorten tap to tap time, improved the metal content of recovery rate of iron and sponge iron.Reduced production cost, the production efficiency height has also digested the waste resource that produces in the steelmaking process, has prevented environmental pollution.Adopt method of the present invention can produce the sponge iron of spherical or other shapes.The sponge iron intensity height of producing, the metal content height, use properties is good.Being particularly suitable for smelting equipments such as converter, electric furnace uses.The sponge iron TFe that this method is produced is not less than 90%, meets the service requirements of converter, electric stove metal raw material fully.
Embodiment
Describe this in detail below in conjunction with embodiment and utilize carbon dedusting ash and iron scale to produce the embodiment of the method for sponge iron, but this embodiment of utilizing carbon dedusting ash and iron scale to produce the method for sponge iron is not limited to following embodiment.
Embodiment one
This embodiment that utilizes carbon dedusting ash and iron scale to produce the method for sponge iron is following sequential steps:
The method of utilizing carbon dedusting ash and iron scale to produce sponge iron comprises following sequential steps:
(1) batch mixing
Blast furnace dust, carbon dedusting ash and iron scale are stirred by following proportion by weight: blast furnace dust 29 carbon dedusting ash 1 iron scale 70
And then add the water of proportion by weight 3 and 1 binding agent mixes.
(2) pressure ball
After above-mentioned material mixing, send into the pair roller ball press with belt, under 10MPa pressure, be squeezed into the pressure ball of diameter 5cm, pressure ball warehouse-in natural curing 3 days promptly gets the pressure ball finished product.
(3) going into kiln smelts
Pressure ball is tiled on the tunnel furnace chassis, and layer thickness is 600mm, the coke of top layer tiling 50mm, under 1200 ℃ of conditions, insulation 12h, cooling 6h sponge iron, kiln discharge.
(4) finished product warehouse-in
The sponge iron screening of kiln discharge is separated top layer tiling coke powder, promptly get the sponge iron finished product of TFe＞90%, warehouse-in.
The proportion by weight of the main component of the sponge iron of present embodiment sees Table 1.
Table 1
Embodiment two
This utilize carbon dedusting ash and iron scale produce sponge iron method embodiment for following successively
Step:
(1) batch mixing
Blast furnace dust, carbon dedusting ash, iron scale and coke powder are stirred by following proportion by weight:
Blast furnace dust 22 carbon dedusting ash 3 iron scales 65 coke powders 10
And then add the water of proportion by weight 3 and 1 part binding agent mixes.
(2) pressure ball
After above-mentioned material mixing, send into the pair roller ball press with belt, under 10MPa pressure, be squeezed into the pressure ball of diameter 5cm, pressure ball warehouse-in natural curing 3 days promptly gets the pressure ball finished product.
(3) going into kiln smelts
Pressure ball is tiled on the tunnel furnace chassis, and layer thickness is 600mm, the coke of top layer tiling 50mm, under 1200 ℃ of conditions, insulation 12h, cooling 6h sponge iron, kiln discharge.
(4) finished product warehouse-in
The sponge iron screening of kiln discharge is separated top layer tiling coke powder, promptly get the sponge iron finished product of TFe＞90%, warehouse-in.
The proportion by weight of the main component of the sponge iron of present embodiment sees Table 2.
Table 2
The raw material of above-mentioned two embodiment is 600Kg for every part, and binding agent is a humic acid.
Claims (1)
1. method of utilizing carbon dedusting ash and iron scale to produce sponge iron, it comprises following sequential steps:
(1) batch mixing
Blast furnace dust, carbon dedusting ash and iron scale are stirred by following proportion by weight:
Blast furnace dust 1～50 carbon dedusting ash 1～20 iron scale 30～80
And then adding the water of proportion by weight 1～15 and 1～5 binding agent mixes, binding agent is a humic acid;
(2) pressure ball
After above-mentioned material mixing, be squeezed into pressure ball with the pair roller ball press, pressure ball oven dry or natural air drying;
(3) going into kiln smelts
Pressure ball is tiled on the tunnel furnace chassis, and layer thickness is 500mm～700mm, at the coke of pressure ball top layer tiling thickness 40mm～60mm, and under 1200 ℃ ± 100 ℃ conditions, insulation 12h ± 1h, the cooling back becomes sponge iron, kiln discharge;
(4) finished product warehouse-in
The sponge iron screening of kiln discharge is separated top layer tiling coke powder, promptly get the sponge iron finished product of TFe＞90%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100754351A CN101691621B (en) | 2009-09-15 | 2009-09-15 | Method of producing sponge iron from carbon dedusting ash and iron scales |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100754351A CN101691621B (en) | 2009-09-15 | 2009-09-15 | Method of producing sponge iron from carbon dedusting ash and iron scales |
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| Publication Number | Publication Date |
|---|---|
| CN101691621A CN101691621A (en) | 2010-04-07 |
| CN101691621B true CN101691621B (en) | 2011-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100754351A Expired - Fee Related CN101691621B (en) | 2009-09-15 | 2009-09-15 | Method of producing sponge iron from carbon dedusting ash and iron scales |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351474A (en) * | 2011-07-11 | 2012-02-15 | 山西太钢不锈钢股份有限公司 | Method for preparing shaft furnace carbon brick from abrasive dust |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041379A (en) * | 2010-09-29 | 2011-05-04 | 山西太钢不锈钢股份有限公司 | Utilization method of acid remelted iron powder |
| CN102212679A (en) * | 2011-05-23 | 2011-10-12 | 山西太钢不锈钢股份有限公司 | Method for recycling acid regeneration iron powder pressed balls |
| CN102776361A (en) * | 2012-06-12 | 2012-11-14 | 山西太钢不锈钢股份有限公司 | Method for producing sinter through utilizing stainless steel dedusting ash and stainless steel mill scale |
| CN103741030B (en) * | 2013-12-16 | 2016-05-04 | 芜湖市天雄新材料科技有限公司 | A kind of high performance powder metallurgical gear |
| CN106244755B (en) * | 2016-08-19 | 2018-06-08 | 环境保护部华南环境科学研究所 | A kind of device for producing sponge iron |
| CN114752722A (en) * | 2022-04-27 | 2022-07-15 | 山东钢铁股份有限公司 | Method for treating electric furnace dust removal ash through tunnel kiln technology |
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2009
- 2009-09-15 CN CN2009100754351A patent/CN101691621B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351474A (en) * | 2011-07-11 | 2012-02-15 | 山西太钢不锈钢股份有限公司 | Method for preparing shaft furnace carbon brick from abrasive dust |
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