CN101586172B - Method for preparing metallized pellet and reduced iron powder - Google Patents
Method for preparing metallized pellet and reduced iron powder Download PDFInfo
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- CN101586172B CN101586172B CN200910304064XA CN200910304064A CN101586172B CN 101586172 B CN101586172 B CN 101586172B CN 200910304064X A CN200910304064X A CN 200910304064XA CN 200910304064 A CN200910304064 A CN 200910304064A CN 101586172 B CN101586172 B CN 101586172B
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Abstract
The present invention relates to a method for preparing a metallized pellet and reduced iron powder, belonging to a metallurgy field. The technical problem resolved by the invention is to provide a method for preparing the metallized pellet and reduced iron powder without an enclosed or non oxygen action. The method for preparing the metallized pellet includes steps a. mixing the iron concentrate,a catalyst and a reducing agent according to a weight ratio: 1:0.02-0.2:0.1-0.8 uniformly; b. making the mixed material at a temperature of 800 to 1400 DEG C to react thoroughly; c. cooling to obtainthe metallized pellet. The metallized pellet is crushed and milled to prepate the reduced iron powder. The preparation method of the invention has advantages of non pollution, high iron recovery rate, low cost and high quality of the reduced iron powder (the purity of the reduced iron powder will be more than 96%). The invention provides a novel selection for preparing the metallized pellet and the reduced iron powder, and has a wide application prospect.
Description
Technical field
The present invention relates to the preparation method of metallized pellet and reduced iron powder, belong to field of metallurgy.
Background technology
Reduced iron powder normally utilizes the oxide compound (iron ore concentrate, steel scale of steel rolling etc.) of solid or gaseous reducing agent (coke, charcoal, hard coal, water-gas, conversion Sweet natural gas, cracked ammonium, hydrogen etc.) reduced iron to produce spongiform iron.The main application of reduced iron powder has: the sintered metal product reduced iron powder, and the industry consumes 60～80% of reduced iron powder total amount; The welding electrode reduced iron powder adds 10～70% reduced iron powders and can improve the weldprocedure of welding rod and significantly improve deposition efficiency in coating; The chemical industry reduced iron powder is mainly used in chemical catalyst, the precious metal reduction, and alloy adds, copper displacement etc.; The cutting stainless steel reduced iron powder when the cutting steel work, sprays iron powder in oxy-acetylene flame, can improve cutting property, enlarges the scope of cutting steel grade, but improves cutting thickness.
At present, the main He Genasifa of employing produces reduced iron powder, this method at first fills in the high grade iron concentrate (TFe 〉=70%) of purifying in the fire-clay crucible with solid reductant (hard coals of coke powder or blending 10～15% lime powders), then in tunnel furnace internal heating to 1150～1250 ℃, unload jar through taking out about long-time reduction (reaching tens hours) postcooling to 200 ℃, vent one's spleen with the ammonia branch through the iron sponge powder of choosing of fragmentation mill and the acquisition of dry back and in heat-stable steel band type stove, carry out reduced anneal (annealing temperature is 800～900 ℃) and obtain reduced iron powder.But the used recovery time of this method is longer, and energy consumption is big, and the iron level of required iron ore concentrate is higher, and is inapplicable for the iron ore concentrate that iron level is lower, and this method need carry out under airtight or oxygen free condition, to the equipment requirements height, also can increase production cost.
The iron ore concentrate of China particularly the sefstromite concentrate of Panzhihua Region because iron level lower (being generally about 58%), be difficult to utilize it to produce reduced iron powder, usually adopt the mode of blast furnace smelting to produce molten iron-steelmaking, this method has the energy consumption height, pollutes shortcomings such as heavy, that coke consumption is big, cost is high, flow process is tediously long, and the titanium in the blast furnace slag and vanadium are difficult to be utilized effectively.
Summary of the invention
Technical problem to be solved by this invention provides a kind of do not need the to take metallized pellet of airtight or anaerobic measure and the preparation method of reduced iron powder.
The used iron ore concentrate of the present invention is meant the common iron ore concentrate (iron ore concentrate that does not contain the vanadium titanium) of iron level 〉=50% or the sefstromite concentrate of iron level 〉=25%.
The preparation method of metallized pellet of the present invention comprises the steps:
A, mixing of materials: with iron ore concentrate, catalyzer and reductive agent by weight 1: 0.02～0.2: 0.1～0.8 mixing; Wherein, described catalyzer is sodium salt or sylvite, as: sodium-chlor, sodium sulfate, Repone K or vitriolate of tartar etc.; Described reductive agent can adopt the conventional reduction agent, as: at least a in coke, charcoal, the coal dust;
B, reduction: the material behind a step mixing is in 800～1400 ℃ of fully reactions (reacting 5～60min generally speaking gets final product) down of temperature; Reduction can be carried out in kilns such as grate kiln, shaft furnace or tunnel furnace; Reduction process is without any need for airtight or gas shield measure, and (being that oxygen level is about 20%) gets final product in air;
C, cooling obtain metallized pellet (degree of metalization can reach more than 80%, can be directly used in ironmaking and steel-making).
The preparation method of reduced iron powder of the present invention, be with the preparation method of above-mentioned metallized pellet preparation and metallized pellet obtain reduced iron powder through broken, ore dressing.
The preparation method of metallized pellet of the present invention and reduced iron powder; (iron level of common iron ore concentrate can be low to moderate 50% can to adopt low taste; the iron level of sefstromite concentrate can be low to moderate 25%) iron ore concentrate produce; thoroughly solved the technical barrier that is difficult to produce metallized pellet and reduced iron powder with more low-grade iron ore concentrate; its production process is without any need for airtight or gas shield measure; (being that oxygen level is about 20%) can realize the production of reduced iron powder in air; equipment requirements is low, and the metallized pellet of being produced can be directly used in ironmaking and steel-making.The inventive method is pollution-free, iron recovery is high, cost is low, the quality of gained reduced iron powder higher (purity of reduced iron powder can reach more than 96%).For producing of metallized pellet and reduced iron powder provides a kind of new selection, have broad application prospects.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
The preparation method of metallized pellet of the present invention and reduced iron powder comprises the steps:
A, mixing of materials: with iron ore concentrate, catalyzer and reductive agent by weight 1: 0.02～0.2: 0.1～0.8 mixing; Wherein, described catalyzer is sodium salt or sylvite, as: sodium-chlor, sodium sulfate, Repone K or vitriolate of tartar etc.; Described reductive agent can adopt the conventional reduction agent, as: at least a in coke, charcoal, the coal dust;
B, reduction: the material behind a step mixing is in 800～1400 ℃ of fully reactions (reacting 5～60min generally speaking gets final product) down of temperature; Reduction can be carried out in kilns such as grate kiln, shaft furnace or tunnel furnace; Reduction process is without any need for airtight or gas shield measure, and (being that oxygen level is about 20%) gets final product in air;
C, cooling obtain metallized pellet (degree of metalization can reach more than 80%, can be directly used in ironmaking and steel-making).
Further, in order to shorten the reaction times, enhance productivity, the granularity of iron ore concentrate, sodium salt and the reductive agent described in the above-mentioned a step is preferably 20～200 orders.
Further, in order to improve reduction rate, shorten the recovery time, also add binding agent during above-mentioned a step mixing of materials, make ball, drying according to a conventional method behind each material mixing, enter the reduction of b step then.The pelletizing diameter of making ball is generally 0.2～6 centimetre.Wherein, described binding agent is conventional iron concentrate pelletization binding agent, as: wilkinite.The consumption of binding agent is a conventional amount used, makes the ball needs and gets final product to satisfy.
Above-mentioned c, the described cooling of d step, fragmentation, ore dressing can be undertaken by this area ordinary method.As: cooling can be adopted the blowing cooling, direct water drenches bubble or other cooling systems that can reach cooling performance are finished.In order to shorten cooling time, effectively prevent secondary oxidation, water spray is preferably adopted in the described cooling of above-mentioned c step or the mode that is soaked in water is cooled off.
The preparation method of reduced iron powder of the present invention, be with the preparation method of above-mentioned metallized pellet preparation and metallized pellet obtain reduced iron powder through broken, ore dressing.
Further,, the gained reduced iron powder can be crushed to below granularity 200 orders, reduce under hydrogen atmosphere in 600～950 ℃ then and obtain the secondary reduction iron powder in order to obtain the higher reduced iron powder of purity.
Further, the tailings of ore dressing is the vanadium titanium products among the preparation method of reduced iron powder of the present invention, through handling recyclable titanium and vanadium again, realizes mineral resources comprehensive utilization.
Below in conjunction with embodiment the specific embodiment of the present invention is further described, does not therefore limit the present invention to (iron level among the following embodiment, content of titanium dioxide are the quality percentage composition) among the described scope of embodiments.
Embodiment 1 adopts the inventive method to prepare metallized pellet and reduced iron powder
With the common iron ore concentrate of 100g (iron content: 63%, granularity is-200 orders), 30g coal dust (granularity is-200 orders), 5g sodium sulfate and 1.8g wilkinite mixing, reaction is 5 minutes under 1300 ℃ temperature, and atmosphere is that oxygen level is less than 18%.Through water cooling, obtain grade and be 85% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 93.62%, and the rate of recovery is 78%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 600 ℃ through hydrogen reducings then is 97.68% secondary reduction iron powder.
Embodiment 2 adopts the inventive method to prepare metallized pellet and reduced iron powder
With the common iron ore concentrate of 100g (iron content: 65%, granularity is-20 orders), 30g coal dust (granularity is-200 orders), 1g Repone K and 3g wilkinite mixing, make ball, 150 ℃ of oven dry, reaction is 60 minutes under 1300 ℃ temperature, atmosphere is that oxygen level is less than 20%.Through water cooling, obtain grade and be 90% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 94.79%, and the rate of recovery is 82%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 800 ℃ through hydrogen reducings then is 98.87% secondary reduction iron powder.
Embodiment 3 adopts the inventive method to prepare metallized pellet and reduced iron powder
With 100g sefstromite concentrate (iron content: 57.25%, titanium dioxide: 10.83%, granularity is-200 orders), 30g coke powder (granularity is-20 orders), 15g sodium-chlor and 2.3g wilkinite mixing, reaction is 60 minutes under 1000 ℃ temperature, atmosphere is that oxygen level is less than 16%.Through water cooling, obtain grade and be 78% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 90.28%, and the rate of recovery is 69%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 850 ℃ through hydrogen reducings then is 96.92% secondary reduction iron powder.
Embodiment 4 adopts the inventive method to prepare metallized pellet and reduced iron powder
With 100g sefstromite concentrate (iron content: 56.68%, titanium dioxide: 10.72%, granularity is-200 orders), 30g coke powder (granularity is-200 orders), 5g vitriolate of tartar and 1.2g wilkinite mixing, make ball, 150 ℃ of oven dry, reaction is 20 minutes under 1400 ℃ temperature, and atmosphere is that oxygen level is less than 17%.Through water cooling, obtain grade and be 83% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 95.66%, and the rate of recovery is 80%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 950 ℃ through hydrogen reducings then is 98.55% secondary reduction iron powder.
Embodiment 5 adopts the inventive method to prepare metallized pellet and reduced iron powder
With 100g sefstromite concentrate (iron content: 56.91%, titanium dioxide: 12%, granularity is-200 orders), 30g coal dust (granularity is-200 orders), 20g sodium sulfate and 1g wilkinite mixing, make ball, 150 ℃ of oven dry, reaction is 20 minutes under 1300 ℃ temperature, atmosphere is that oxygen level is less than 20%.Through water cooling, obtain grade and be 88% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 94.88%, and the rate of recovery is 83%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 850 ℃ through hydrogen reducings then is 98.67% secondary reduction iron powder.
Embodiment 6 adopts the inventive method to prepare metallized pellet and reduced iron powder
With 100g sefstromite concentrate (iron content: 57.46%, titanium dioxide: 6.33%, granularity is-200 orders), 60g coal dust (granularity is-200 orders), 5g sodium sulfate and 1.8g wilkinite mixing, make ball, 150 ℃ of oven dry, reaction is 30 minutes under 1300 ℃ temperature, atmosphere is that oxygen level is less than 20%.Through water cooling, obtain grade and be 82% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 95.45%, and the rate of recovery is 82%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 650 ℃ through hydrogen reducings then is 98.32% secondary reduction iron powder.
Embodiment 7 adopts the inventive method to prepare metallized pellet and reduced iron powder
With 100g sefstromite concentrate (iron content: 57.46%, titanium dioxide: 6.33%, granularity is-20 orders), 50g coal dust (granularity is-200 orders), 3g vitriolate of tartar and 1.8g wilkinite mix, make ball, 150 ℃ of oven dry, reaction is 30 minutes under 1300 ℃ temperature, atmosphere is that oxygen level is less than 20%.Through water cooling, obtain grade and be 80% metallized pellet, metallized pellet obtains reduced iron powder through broken, ore dressing, and the grade of iron is 93.56%, and the rate of recovery is 77%; Reduced iron powder is crushed to below granularity 200 orders, and obtaining the iron grade in 750 ℃ through hydrogen reducings then is 98.55% secondary reduction iron powder.
Claims (9)
1. the preparation method of metallized pellet is characterized in that: comprise the steps:
A, mixing of materials: with iron ore concentrate, catalyzer and reductive agent by weight 1: 0.02～0.2: 0.1～0.8 mixing; Wherein, described catalyzer is sodium-chlor, sodium sulfate, Repone K or vitriolate of tartar;
B, reduction: the material behind a step mixing under 1300～1400 ℃ of temperature at grate kiln, shaft furnace or tunnel furnace internal reaction 5～30min;
C, cooling obtain metallized pellet.
2. the preparation method of metallized pellet according to claim 1, it is characterized in that: the reductive agent described in a step is at least a in coke, charcoal, the coal dust;
3. the preparation method of metallized pellet according to claim 1, it is characterized in that: the granularity of described iron ore concentrate, catalyzer and reductive agent is 20～200 orders.
4. according to the preparation method of each described metallized pellet of claim 1～3, it is characterized in that: also add binding agent during a step mixing of materials, make ball, drying behind each material mixing, enter the reduction of b step then.
5. the preparation method of metallized pellet according to claim 4, it is characterized in that: described binding agent is a wilkinite.
6. according to the preparation method of claim 1,2,3 or 5 described metallized pellets, it is characterized in that: the described type of cooling of c step is for spraying or the cooling that is soaked in water with the cooling of blowing, water.
7. the preparation method of metallized pellet according to claim 4 is characterized in that: the described type of cooling of c step is for spraying or the cooling that is soaked in water with the cooling of blowing, water.
8. the preparation method of reduced iron powder, it is characterized in that: the preparation method by each described metallized pellet of claim 1～7 prepares metallized pellet, and metallized pellet fragmentation, ore dressing are obtained reduced iron powder.
9. the preparation method of reduced iron powder according to claim 8, it is characterized in that: the gained reduced iron powder is crushed to below granularity 200 orders, then in 600～950 ℃ under hydrogen atmosphere reduction obtain the secondary reduction iron powder.
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| CN102329912A (en) * | 2011-10-28 | 2012-01-25 | 余成鹏 | Quick reduction method for directly reducing iron |
| CN102642027B (en) * | 2012-04-11 | 2014-01-15 | 莱芜钢铁集团有限公司 | Process for producing reduced iron powder |
| CN103451415A (en) * | 2012-06-01 | 2013-12-18 | 李永毅 | Preparation method of semi-steel iron pellets as iron&steel smelting raw material |
| CN102703714A (en) * | 2012-06-04 | 2012-10-03 | 红河锌联科技发展有限公司 | Method for preparing iron powder and recovering nonferrous metal from blast furnace iron making smoke dust |
| CN103290159B (en) * | 2013-06-06 | 2015-09-09 | 昆明钢铁集团有限责任公司 | The method of direct-reduction iron powder is produced in a kind of microwave heating |
| CN104278147B (en) * | 2013-07-03 | 2016-08-17 | 中冶东方工程技术有限公司秦皇岛研究设计院 | Use the method that carbonaceous pelletizing produces DRI |
| CN103572044B (en) * | 2013-10-12 | 2015-03-04 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN104152620B (en) * | 2014-08-28 | 2016-04-06 | 攀枝花市立宇矿业有限公司 | For the method and apparatus of powdered iron ore direct-reduction |
| CN104178593B (en) * | 2014-08-28 | 2016-05-25 | 攀枝花市立宇矿业有限公司 | Iron Ore Powder direct reduction process and equipment |
| CN104493184B (en) * | 2014-11-27 | 2017-08-22 | 南京大学 | The manufacture method of spherical bell metal powder |
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| CN105772706B (en) * | 2016-04-19 | 2018-01-16 | 玉溪大红山矿业有限公司 | The method that qualified micro alloy iron powder is produced with a reduced iron powder of the high hydrogen loss of high-carbon |
| CN107674933A (en) * | 2017-09-30 | 2018-02-09 | 徐州众工精密模锻有限公司 | A kind of method of reducing iron ore |
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| MX2022013918A (en) * | 2020-05-28 | 2022-11-30 | Nippon Steel Corp | Method for producing reduced iron. |
| CN112410540B (en) * | 2020-11-27 | 2023-01-31 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN113174459A (en) * | 2021-04-13 | 2021-07-27 | 中国科学院过程工程研究所 | Method for preparing secondary reduced iron powder by using iron ore concentrate |
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Free format text: FORMER OWNER: GUAN XIAOWEI AN DONG Owner name: PANZHIHUA LIYU MINING CO., LTD. Free format text: FORMER OWNER: HE DEWU Effective date: 20111115 |
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Effective date of registration: 20111115 Address after: 617000 Panzhihua City, Sichuan province Miyi County town of Wu Qingcun seven back agency Panzhihua Liyu Mining Co. Ltd. Patentee after: Panzhihua Liyu Mining Co., Ltd. Address before: 4, building 3, building 479, No. 617000 east side, Eastern District, Panzhihua, Sichuan Co-patentee before: Guan Xiaowei Patentee before: He Dewu Co-patentee before: An Dong |