CN102198509A - Method for producing iron concentrate powder by using reductive magnetizing rotary furnace - Google Patents
Method for producing iron concentrate powder by using reductive magnetizing rotary furnace Download PDFInfo
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- CN102198509A CN102198509A CN2010101303145A CN201010130314A CN102198509A CN 102198509 A CN102198509 A CN 102198509A CN 2010101303145 A CN2010101303145 A CN 2010101303145A CN 201010130314 A CN201010130314 A CN 201010130314A CN 102198509 A CN102198509 A CN 102198509A
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Abstract
The invention relates to a method for producing iron concentrate powder by using a reductive magnetizing rotary furnace. The method comprises the following steps of: fully mixing 3 or 5 weight percent of reducing carbon with granularity of less than or equal to 5 millimeters and 97 or 95 weight percent of limonite powder with granularity of less than or equal to 10 millimeters and grade of 45 percent to obtain powder; delivering the powder to the magnetizing rotary furnace, delivering the burning coal gas generated by a coal gas producer to the magnetizing rotary furnace to roast the powder in the furnace, performing attached water removal, the reaction being: Fe2O3.nHO2O(H2O)+heat-> Fe2O3.nH2O+H2O, crystallization water removal, the reaction being: Fe2O3.nH2O+heat-> Fe2O3.nH2O and reductive magnetization, the reaction being: C+6Fe2O3->4Fe3O4+CO2+heat at the temperature of between 600 and 900 DEG C, delivering dust-containing smoke to a smoke chamber outside the furnace from the magnetizing rotary furnace, performing five-stage dust removal, collecting dust, and exhausting tail gas; delivering the powder calcined by the magnetizing rotary furnace to a cooler, and performing water quenching to obtain finished limonite powder with grade of 56 percent; and sequentially delivering the finished limonite powder to a ball mill and a magnetic separator, and finally obtaining the iron concentrate powder with grade of 60 percent.
Description
Technical field
The present invention relates to a kind of iron slag that low-grade limonite, bloodstone or sulfuric acid plant are effluxed and produce the preparation method that grade is higher than 60% the smart powder of iron, the preparation method who especially utilizes reduction magnetization rotary furnace to produce the smart powder of iron as raw material.
Background technology
Although the explored iron ore reserves of China are occupied the 5th position in world's seniority among brothers and sisters, 97.5% in its reserves are lean ores, and the abundant ore source that can smelt iron, make steel directly into stove only accounts for 1.8% of gross reserves.Obviously, China spends more the foreign exchange of expense definitely more than surrounding countries on the problem that solves ironmaking, steel-making " fine fodder ".In the face of many, the mineral resources of the lean ore resource problem wide, mineral comprehensive utilization difference that distributes, domestic have considerable enterprise to develop much to be of value to that the lean ore resource is handled or the new process of mine tailing resource processing.For example, all provided the technology path of the lean ore raw material being brought up the recovery of preferred metal iron respectively in C22B1/02, the C04B7/00 of patent classification, the document of its Chinese patent disclosure of B03C1/00 field " a kind of method ", " a kind of method of magnetic separation concentration " etc. with weak magnetic iron ore for producing fine iron powder and cement.Yet attachment removal water is an a kind of technique known difficult problem with taking off the crystallization water in the solution mineral resources in producing the smart powder process of iron; How doing, how do i is the present invention's problem that painstakingly will solve just.
Summary of the invention
Purpose of the present invention and technical problem to be solved be when the limonite of producing low-grade (～48%), when bloodstone is produced as raw material with the attached water in the raw material with take off the crystallization water and separate out as far as possible, be higher than 60% iron essence powder thereby guarantee to produce grade;
For this reason, the technical scheme that the present invention solves described problem is: a kind of preparation method who utilizes reduction magnetization rotary furnace to produce the smart powder of iron may further comprise the steps:
(1) reduction carbon and the weight ratio that with weight ratio be 3% or 5%, granularity is less than or equal to 5mm is 97% or 95%, granularity is less than or equal to 10mm, grade for～45% brown ocher fully mix the material powder;
(2) will expect that powder inputs to the magnetization rotary furnace, the burning coal gas that is produced by gas generator inputs to the magnetization rotary furnace to expecting in the stove that powder carries out roasting, is to carry out under 600～900 ℃ of conditions in temperature: attachment removal water, Fe
2O
3NHO
2O (H
2O)+heat → Fe
2O
3NH
2O+H
2O ↑,
Take off the crystallization water, F
2O
3NH
2O+ heat → Fe
2O
3+ nH
2O ↑,
The reduction magnetization, C+6Fe
2O
3→ 4Fe
3O
4+ CO
2↑+heat,
And carry ash-laden gas to carry out the Pyatyi dedusting, reclaim dust, discharge tail gas by magnetization rotary furnace smoke-box outside stove;
(3) input to cooler through the material powder of magnetization rotary furnace calcining and carry out shrend, grade is～56% finished product brown ocher;
(4) the finished product brown ocher is imported ball mill, magnetic separator in regular turn, eventually grade be～60% iron essence powder.
Preferably, its Control for Kiln Temperature interval of described reduction magnetization rotary furnace is divided into four sections by the furnace superintendent direction: dryer section, preheating section, conversion zone, cooling section, and the temperature of whole section is set in 600 ℃ to 900 ℃, stove exit gas temperature and is controlled at 400 ℃ to 500 ℃.
Preferably, negative pressure is set in 20Pa to 50Pa in described its stove of reduction magnetization rotary furnace.
Preferably, described its body of heater rotary kiln speed of reduction magnetization rotary furnace is set in 1 to 2r/min.
Compared to existing technology, the good effect that the present invention produced is: the limonite of low-grade (～48% or following), bloodstone can be carried out magnetic separation through ball mill, magnetic separator after through the roasting of magnetization rotary furnace again by this preparation method and finally can obtain grade and be higher than 60% the smart powder of iron.Its guaranteed conditions is exactly to make original low-grade iron ore bring up to more than 90% through the material powder magnetic susceptibility after the roasting by method of the present invention, and in the face of material powder to be processed like this, the grade of the smart powder of its ultimate product iron has high-quality lifting naturally.
Description of drawings
Fig. 1 is that preparation method's flow chart that rotary furnace is produced the smart powder of iron is magnetized in the utilization reduction that the present invention relates to.
Among the figure: the visual magnetization rotary furnace transition of dotted portion situation random installation.
The specific embodiment
Referring to accompanying drawing 1, the present invention relates to a kind of preparation method who utilizes reduction magnetization rotary furnace to produce the smart powder of iron, may further comprise the steps:
(1) reduction coal dust and the weight ratio that with weight ratio be 3% or 5%, granularity is less than or equal to 5mm is 97% or 95%, granularity is less than or equal to 10mm, grade for～45% brown ocher fully mix the material powder;
(2) will expect that powder inputs to the magnetization rotary furnace, the burning coal gas that is produced by gas generator inputs to the magnetization rotary furnace to expecting in the stove that powder carries out roasting, is to carry out under 600～900 ℃ of conditions in temperature: attachment removal water, Fe
2O
3NHO
2O (H
2O)+heat → Fe
2O
3NH
2O+H
2O ↑,
Take off the crystallization water, F
2O
3NH
2O+ heat → Fe
2O
3+ nH
2O ↑
The reduction magnetization, C+6Fe
2O
3→ 4Fe
3O
4+ CO
2↑+heat,
And carry ash-laden gas to carry out the Pyatyi dedusting, reclaim dust, discharge tail gas by magnetization rotary furnace smoke-box outside stove;
(3) input to cooler through the material powder of magnetization rotary furnace calcining and carry out shrend, grade is～56% finished product brown ocher;
(4) the finished product brown ocher is imported ball mill, magnetic separator in regular turn, eventually grade be～60% iron essence powder.
Specifically, for obtaining the smart powder of high-grade iron, the technical measures of the protection that the present invention points out comprise a plurality of key elements such as body of heater rotary kiln speed, body of heater installation gradient, the combustion-supporting blast of burner, combustion air volume, stove tail temperature, stove tail negative pressure, stove exit gas amount.For example, must emphasize that to the installation of magnetization rotary furnace it installs gradient is 5%; The requirement of body of heater rotating speed should be limited between 1 to 2r/min, because the time of staying of compound powder in stove was set in about 50～90 minutes, then compound is short at residing time in furnace if stove is reported too soon, physical and chemical reaction is poor, then compound is long at residing time in furnace if stove is reported too slowly, physical and chemical reaction is complete but the batch processed amount is low, and the product amount of the smart powder of iron is little; And the combustion-supporting blast of burner should be controlled at 6000～7000Pa, combustion air volume～7000m
3/ h; Again for example, optimize the interior temperature-controlled area section of the stove that magnetizes rotary furnace and should be divided into four sections: dryer section, preheating section, conversion zone, cooling section by the furnace superintendent direction.This is that the reaction speed of ferriferous oxide is faster because temperature is higher in the stove; But temperature is too high, the corrosion of furnace lining aggravation is shortened the life-span of furnace lining, also causes the fusing of compound powder to make in the stove ring formation simultaneously easily and causes the smart powder kiln discharge of iron rate low, and body of heater is fragile.So must limit the temperature index of each section in the body of heater, in the practice, the temperature of the compound powder in each preferable section with the gas temperature corresponding relation that enters in the body of heater is: 450～600 ℃ of dryer section to 650～700 ℃ of 400～500 ℃, preheating section to 800～900 ℃ of 700 ~ 800 ℃, conversion zone to 600～700 ℃ of 850 ~ 950 ℃, cooling section to 500 ~ 600 ℃; And the temperature of whole section is set in 600 ℃ to 900 ℃, stove exit gas temperature and is controlled at 400 ℃ to 500 ℃.
In addition, the setting that could obtain negative pressure in smart powder of high-grade iron and the body of heater also has direct relation, if negative pressure is excessive, the air that then enters in the stove increases, reduced furnace reduction atmosphere, cause stove tail temperature to raise and to cause the charging elephant trunk to damage, even cause material powder fine grained to be taken away, strengthened the load of dust pelletizing system simultaneously with waste gas; If negative pressure is too small, furnace air quantity not sufficient then, the reach of thermotonus section influences the body of heater operate as normal equally, and the smart opaque amount of iron can not get stable assurance, and therefore, negative pressure is set in 20Pa to 50Pa in the stove in the practice.
The method that utilization the present invention relates to is produced the smart powder of iron and has been satisfied environmental protection requirement simultaneously.This is to should be the present invention to have adopted five step process of cleaning: the first step is to reenter the stove roasting with being reclaimed to mix with iron powder once more by the thick dirt in the smoke-box, simultaneously flue gas is sent into the thick dirt recovery in second step of gas cooler cooling realization and incorporated into stove dirt, by sack cleaner the fine dust in the flue gas is reclaimed again and incorporate stove dirt into and realized for the 3rd step, the flue gas that comes out through sack cleaner is admitted to desulfurizing tower and obtains the byproduct output effect that desulfurated plaster realized for the 4th step simultaneously, and last the 5th step is to have realized that through discharging the tail gas dustiness is limited at≤500/Nm
3
Through facts have proved, can produce the iron slag that 500 tons brown, bloodstone or sulfuric acid plant efflux daily according to preparation method of the present invention, its economic benefit is self-evident.
Claims (4)
1. one kind is utilized reduction to magnetize the preparation method that rotary furnace is produced the smart powder of iron, may further comprise the steps:
(1) reduction carbon and the weight ratio that with weight ratio be 3% or 5%, granularity is less than or equal to 5mm is 97% or 95%, granularity is less than or equal to 10mm, grade for～45% brown ocher fully mix the material powder;
(2) will expect that powder inputs to the magnetization rotary furnace, the burning coal gas that is produced by gas generator inputs to the magnetization rotary furnace to expecting in the stove that powder carries out roasting, is to carry out under 600～900 ℃ of conditions in temperature: attachment removal water, Fe
2O
3NHO
2O (H
2O)+heat → Fe
2O
3NH
2O+H
2O ↑,
Take off the crystallization water, F
2O
3NH
2O+ heat → Fe
2O
3+ nH
2O ↑,
The reduction magnetization, C+6Fe
2O
3→ 4Fe
3O
4+ CO
2↑+heat,
And carry ash-laden gas to carry out the Pyatyi dedusting, reclaim dust, discharge tail gas by magnetization rotary furnace smoke-box outside stove;
(3) input to cooler through the material powder of magnetization rotary furnace calcining and carry out shrend, grade is～56% finished product brown ocher;
(4) the finished product brown ocher is imported ball mill, magnetic separator in regular turn, eventually grade be～60% iron essence powder.
2. the preparation method that utilization reduction magnetization rotary furnace according to claim 1 is produced the smart powder of iron, it is characterized in that, its Control for Kiln Temperature interval of described magnetization rotary furnace is divided into four sections by the furnace superintendent direction: dryer section, preheating section, conversion zone, cooling section, and the temperature of whole section is set in 600 ℃ to 900 ℃, stove exit gas temperature and is controlled at 400 ℃ to 500 ℃.
3. the preparation method that utilization reduction magnetization rotary furnace according to claim 1 is produced the smart powder of iron is characterized in that negative pressure is set in 20Pa to 50Pa in described its stove of magnetization rotary furnace.
4. the preparation method that utilization reduction magnetization rotary furnace according to claim 1 is produced the smart powder of iron is characterized in that its body of heater rotary kiln speed of described magnetization rotary furnace is set in 1 to 2r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101303145A CN102198509A (en) | 2010-03-23 | 2010-03-23 | Method for producing iron concentrate powder by using reductive magnetizing rotary furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101303145A CN102198509A (en) | 2010-03-23 | 2010-03-23 | Method for producing iron concentrate powder by using reductive magnetizing rotary furnace |
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| CN102198509A true CN102198509A (en) | 2011-09-28 |
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ID=44659645
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605168A (en) * | 2011-12-05 | 2012-07-25 | 唐兆青 | Method for extracting limonite and ferric oxide titanium dioxide |
| CN104263908A (en) * | 2014-10-11 | 2015-01-07 | 陈小众 | Reduction roasting method of siderite in rotary kiln |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57171608A (en) * | 1981-04-16 | 1982-10-22 | Res Assoc Residual Oil Process<Rarop> | Method for thermal decomposition of heavy and production of reduced iron powder |
| CN1062767A (en) * | 1991-08-17 | 1992-07-15 | 萍乡钢铁厂 | Shaft furnace process is produced the technology and the equipment of limonite pelletizing |
| CN1827800A (en) * | 2006-04-04 | 2006-09-06 | 张志发 | Method for improving recovery of hematite and limonite |
| CN1861265A (en) * | 2005-04-22 | 2006-11-15 | 纪礽辉 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN101603121A (en) * | 2009-07-01 | 2009-12-16 | 武汉科技大学 | A kind of method with weak magnetic iron ore for producing fine iron powder and cement |
| CN101623670A (en) * | 2009-07-27 | 2010-01-13 | 山东科力华电磁设备有限公司 | Technique for extracting iron ore concentrate powder from sand iron mine of gobi desert |
-
2010
- 2010-03-23 CN CN2010101303145A patent/CN102198509A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57171608A (en) * | 1981-04-16 | 1982-10-22 | Res Assoc Residual Oil Process<Rarop> | Method for thermal decomposition of heavy and production of reduced iron powder |
| CN1062767A (en) * | 1991-08-17 | 1992-07-15 | 萍乡钢铁厂 | Shaft furnace process is produced the technology and the equipment of limonite pelletizing |
| CN1861265A (en) * | 2005-04-22 | 2006-11-15 | 纪礽辉 | Ore-dressing process by using carbon-contg. block to reduce lean iron ore for prodn. of magnetite |
| CN1827800A (en) * | 2006-04-04 | 2006-09-06 | 张志发 | Method for improving recovery of hematite and limonite |
| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN101603121A (en) * | 2009-07-01 | 2009-12-16 | 武汉科技大学 | A kind of method with weak magnetic iron ore for producing fine iron powder and cement |
| CN101623670A (en) * | 2009-07-27 | 2010-01-13 | 山东科力华电磁设备有限公司 | Technique for extracting iron ore concentrate powder from sand iron mine of gobi desert |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605168A (en) * | 2011-12-05 | 2012-07-25 | 唐兆青 | Method for extracting limonite and ferric oxide titanium dioxide |
| CN104263908A (en) * | 2014-10-11 | 2015-01-07 | 陈小众 | Reduction roasting method of siderite in rotary kiln |
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Application publication date: 20110928 |