CN103042223B - A kind of production technology of reduced iron powder - Google Patents
A kind of production technology of reduced iron powder Download PDFInfo
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- CN103042223B CN103042223B CN201210560366.5A CN201210560366A CN103042223B CN 103042223 B CN103042223 B CN 103042223B CN 201210560366 A CN201210560366 A CN 201210560366A CN 103042223 B CN103042223 B CN 103042223B
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Abstract
The present invention relates to a kind of production technology of reduced iron powder.Be characterized in, comprise the steps: (1) by Iron concentrate, reduction coal dust and the pulverized limestone ratio batching by weight 75-85: 12-18: 3-7, weigh, add after preparing in damp mill and carry out mixing and grinding, mix wet feed; (2) wet feed is transported to ball press and carries out pressure ball process; (3) finished ball is made a gift to someone in drying grate and dry, in rotary hearth furnace, complete green-ball be transformed into DRI-metallized pellet; (4) directly enter in quenching tank or quenching bath after coming out of the stove and cool fast, grinding becomes powder, and the impurity then removed wherein obtains an iron powder; (5) dry in dryer, then deliver in secondary reduction stove and carry out secondary reduction.Present approach provides DRI prepared by a kind of rotary hearth furnace as the new technology of an iron powder, the iron powder that tunnel cave is produced can be substituted, thus solve current tunnel cave produce in Problems existing.
Description
Technical field
The present invention relates to a kind of production technology of reduced iron powder.
Background technology
Reduced iron powder is the raw material that powder metallurgy industry manufactures ferrous metals parts.At present, the preparation technology of domestic and international reduced iron powder still continues to use traditional tunnel cave+essence reduction two-step process, that is: fine iron breeze is reduced to DRI by the first step in tunnel cave.Namely DRI becomes an iron powder after broken, grinding, the gangue sieving and remove after magnetic separation wherein and other impurity; Second step is being that reducing gas carries out essence reduction in crawler type reduction furnace with hydrogen, is deeply reduced by the remainder fe fine ore be not reduced, and, utilize higher reduction temperature to remove the internal stress existed in iron powder in a reduction process.But tunnel cave is produced reduced iron and is had that production cost is high, energy consumption is high, the time is long, pollutions is large and workman's working condition poor energy serious problems.Therefore, new reduced iron preparation technology is explored to substitute the technique fallen behind at present be urgent and very necessary.
Rotary hearth furnace is a kind of equipment preparing reduced iron newly grown up in recent years.The technique that a whole set of maturation set up by reduced iron is prepared around rotary hearth furnace.Adopt rotary hearth furnace to produce reduced iron to have that production capacity is high, cost is low, the time is short and the outstanding advantages such as not pollute to environment.Reduced iron prepared by past rotary hearth furnace is mainly used in, as ironmaking and steel-making raw material, seldom relating to for the preparation of in reduced iron powder.So research rotary hearth furnace is prepared powder used in metallurgy iron powder and is had very important significance for the development exploring the new preparation technology of reduced iron powder and promotion powder metallurgy industry.
Summary of the invention
The object of this invention is to provide a kind of production technology of reduced iron powder, the reduced iron powder meeting national standard can be made.
A production technology for reduced iron powder, its special feature is, comprises the steps:
(1) by Iron concentrate, reduction coal dust and the pulverized limestone ratio batching by weight 75-85: 12-18: 3-7, weigh, add after preparing in damp mill and carry out mixing and grinding, controlling pellet weight ratio is 8-12: 1, join after raw material is mixed 40-60min in damp mill in puddle mixer, add the syrup accounting for the bentonite of raw material total amount 2-3wt%, the water of 4-6wt% and 2-3wt% simultaneously and mix wet feed;
(2) wet feed is transported to ball press and carries out pressure ball process;
(3) finished ball is made a gift to someone in drying grate and dry, dry gas temperature 250 DEG C-270 DEG C, dry and send into rotary hearth furnace system to moisture lower than after≤3wt%, in rotary hearth furnace, complete green-ball be transformed into DRI-metallized pellet;
(4) the metallized pellet tapping temperature≤800 ° C of red heat, directly enter in quenching tank or quenching bath after coming out of the stove and cool fast, cooled metallized pellet is delivered to ball mill grinding and becomes powder, then obtain an iron powder by high intensity magnetic separation and gravity separation with the impurity removed wherein;
(5) dried in dryer by obtain iron powder, then deliver in secondary reduction stove and carry out secondary reduction, reduction temperature is 880 DEG C-910 DEG C, and the temperature retention time at least 60min of reduction, namely can obtain reduced iron powder after secondary reduction.
Overall moisture≤the 9wt% of wet feed in step (1).
The raw material that step (1) adopts is: grade is the high-purity refined iron-mineral powder of 70-72wt%, and granularity-200 order is greater than 70%; The fine coal powder of low-phosphorous, low-sulfur, low ash content and fixed carbon content >=75wt%, granularity-200 order is greater than 70%; The pulverized limestone of low-phosphorous, low-sulfur and calcium oxide content >=65wt% powder, granularity-200 order is greater than 50%.
The finished ball that step (2) obtains is ellipticity, and sphere volume is: 23-27mm × 18-22mm × 10-14mm.
In step (4), ball mill adopts the ball mill of Φ 2.1m × 3m.
In step (5), dryer adopts the rotary dryer of Φ 1.5m × 7m.
Secondary reduction stove in step (5) is the crawler type secondary reduction stove adopting constituents to obtain reducing gas hydrogen.
Present approach provides DRI prepared by a kind of rotary hearth furnace as the new technology of an iron powder, the iron powder that tunnel cave is produced can be substituted, thus solve current tunnel cave produce in Problems existing.The inventive method is for primary raw material is according to certain ratio batching, weighing, mixing, adding additives, pressure ball, oven dry, screening with high purity iron fine powder, fine coal powder and pulverized limestone, then, rotary hearth furnace reduction, shrend, fragmentation, ball milling, magnetic separation, gravity preparation, secondary reduction and finished product packing is entered.Detect after test is produced and prove: after a series of technical process, the metal Ferrum content of the powder that the DRI produced by rotary hearth furnace obtains reaches more than 98%, and iron powder is how spherical in group in irregular shape.After secondary reduction, the indices of reduced iron powder reaches the standard of national powder used in metallurgy reduced iron powder completely, and acid non-soluble substance≤0.15, hydrogen loss≤0.15, is suitable for the powder metallurgy parts preparing middle and high intensity.And this technique also have production capacity high, pollute the outstanding advantages such as low and production cost is low.
Detailed description of the invention
Embodiment 1:
By ultrapure iron concentrate powder (TFe70.5wt%, granularity-200 order is greater than 70%), high-quality anthracite powder (fixed carbon 80.2wt%, granularity-200 order is greater than 70%) and fat lime powder (CaO67.2wt%, granularity-200 order is greater than 50%) ratio batching according to 80: 15: 5, to weigh, and to add in damp mill mixing and grinding continuously.Raw material mixes 60min in damp mill, material ball ratio 10: 1.
Raw material after mixed is joined in puddle mixer and carries out mechanical mixture again, the water simultaneously adding the bentonite of 2-3wt%, the syrup bonding agent of 2wt% and about 4wt% stir material is mixed wet.Afterwards, wet feed is joined continuously the oval mini-pellets being pressed into 10mm × 20mm in two roller ball press.Made a gift to someone by mini-pellets in drying grate and dry, dry gas temperature 265 DEG C, after drying, the dry bulb of (moisture is lower than 3wt%) is sent into rotary hearth furnace system and green-ball is reduced to reduced iron pelletizing.Hot-bulb group discharges from rotary hearth furnace when 700 ° of C, and directly enters in quenching tank and cool.
Reduced iron pelletizing after quench cooled is pulled out from quenching tank, joins broken in the ball mill of Φ 1.5m × 3m and grinding, become powder.To be graded by ash in the gangue carried in fine ore and reduction coal Impurity removal by the method for magnetic separation+gravity separation, the iron powder selected puts into Φ 1.5m × 7m rotary dryer 265 DEG C oven dry.
Obtain reduced iron powder being joined continuously and obtains reducing gas with constituents---carry out secondary reduction in the crawler type secondary reduction stove of hydrogen, reduction temperature is 900 DEG C, the temperature retention time 90min of reduction.After secondary reduction, the caking of reduced iron powder smashed and sieved, weighs, pack rear warehouse-in.
After testing: after above-mentioned technical process, the metal Ferrum content of the reduced iron powder that the DRI produced by rotary hearth furnace obtains reaches more than 98%, and iron powder is how spherical in irregular group.After secondary reduction, indices reaches the standard of national powder used in metallurgy reduced iron powder completely, wherein, and loose shape density 2.45g/cm
3, mobility 25.8s/50g, hydrogen loss 0.18%, compressibility 6.78g/cm
3, hydrochloric acid insoluble substance 0.23%, is suitable for the powder metallurgy parts preparing middle and high intensity.
Claims (1)
1. a production technology for reduced iron powder, is characterized in that, comprises the steps:
TFe70.5wt% granularity-200 order is greater than the ultrapure iron concentrate powder of 70%, fixed carbon 80.2wt% granularity-200 order be greater than 70% high-quality anthracite powder and CaO67.2wt% granularity-200 order fat lime powder that is greater than 50% prepare burden according to the ratio of 80:15:5, weigh, and add mixing and grinding in damp mill continuously, raw material mixes 60min in damp mill, material ball ratio 10:1;
Raw material after mixed is joined in puddle mixer and carries out mechanical mixture again, add simultaneously the bentonite of 2-3wt%, the syrup bonding agent of 2wt% and the water of 4wt% stir material is mixed wet; Afterwards, wet feed is joined continuously the oval mini-pellets being pressed into 10mm × 20mm in two roller ball press, mini-pellets is sent in drying grate and dries, dry gas temperature 265 DEG C, green-ball is reduced to reduced iron pelletizing lower than the dry bulb feeding rotary hearth furnace system of 3wt% by the rear i.e. moisture of oven dry, hot-bulb group discharges from rotary hearth furnace when 700oC, and directly enters in quenching tank and cool;
Reduced iron pelletizing after quench cooled is pulled out from quenching tank, joins broken in the ball mill of Φ 1.5m × 3m and grinding, become powder; Removed by ash content in the gangue carried in fine ore and reduction coal by the method for magnetic separation+gravity separation, the iron powder selected puts into Φ 1.5m × 7m rotary dryer 265 DEG C oven dry;
Obtain reduced iron powder is joined continuously and obtains reducing gas with constituents---carry out secondary reduction in the crawler type secondary reduction stove of hydrogen, reduction temperature is 900 DEG C, the temperature retention time 90min of reduction, after secondary reduction, the caking of reduced iron powder smashed and sieved, weighs, pack rear warehouse-in.
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| CN201210560366.5A CN103042223B (en) | 2012-12-21 | 2012-12-21 | A kind of production technology of reduced iron powder |
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|---|---|---|---|---|
| CN103499192B (en) * | 2013-06-25 | 2016-08-31 | 吉林省华兴粉末冶金科技有限公司 | Raw material iron powder chain-type two-chamber drying unit |
| CN103433496B (en) * | 2013-06-25 | 2017-03-22 | 吉林省华兴粉末冶金科技有限公司 | Preparation system of iron powder for powder metallurgy |
| CN103966428B (en) * | 2014-05-21 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of iron concentrate containing high sulphur produces the method for low-sulfur metallized pellet |
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| CN105200228B (en) * | 2015-09-23 | 2017-09-29 | 神雾科技集团股份有限公司 | A kind of processing method of DRI pelletizings |
| CN106238745A (en) * | 2016-08-19 | 2016-12-21 | 朝阳金河粉末冶金材料有限公司 | The method utilizing strip stove temperature production reduced iron powder |
| CN107419157B (en) * | 2017-06-15 | 2019-08-02 | 江苏大学 | A method of Nd Fe B alloys are smelted with reduced iron powder substitution pure iron |
| CN108465547A (en) * | 2018-03-19 | 2018-08-31 | 江苏大学 | A method of utilizing makes deferrization of pulverized coal ash and decarburization be carried out at the same time |
| CN109234486B (en) * | 2018-09-25 | 2023-04-11 | 张雷 | Method and device for producing reduced iron by coal-based direct reduction roasting |
| CN110029200B (en) * | 2019-03-28 | 2020-05-22 | 钢铁研究总院 | Preparation method of iron powder for reducing content of acid insoluble substances in iron raw material |
| CN111068886A (en) * | 2019-12-26 | 2020-04-28 | 广西绿顺生物科技有限公司 | Method for producing high-purity reduced iron powder from red mud |
| CN111389859A (en) * | 2020-03-20 | 2020-07-10 | 安徽工业大学 | Method for recovering iron powder by direct reduction of red mud |
| CN112404430A (en) * | 2020-11-17 | 2021-02-26 | 南通英诺威体育用品科技有限公司 | Production process of sports fitness equipment counter weight |
| CN115213103A (en) * | 2022-07-25 | 2022-10-21 | 北京首钢国际工程技术有限公司 | Method for recovering kiln slag iron powder |
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