CN104263908A - Reduction roasting method of siderite in rotary kiln - Google Patents
Reduction roasting method of siderite in rotary kiln Download PDFInfo
- Publication number
- CN104263908A CN104263908A CN201410534417.6A CN201410534417A CN104263908A CN 104263908 A CN104263908 A CN 104263908A CN 201410534417 A CN201410534417 A CN 201410534417A CN 104263908 A CN104263908 A CN 104263908A
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- CN
- China
- Prior art keywords
- rotary kiln
- iron ore
- coal
- raw material
- spathic iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
Abstract
The invention discloses a reduction roasting method of siderite in a rotary kiln. The method comprises steps as follows: 1, hydrothermal siderite is crushed into particles with particle size smaller than or equal to 0.9 mm, blind coal is crushed into particles with particle size smaller than or equal to 5 mm, and the particles are sufficiently mixed to form mixed raw material powder; 2, the mixed raw material powder enters the rotary kiln from the tail section of the rotary kiln, burning gas generated by a gas generator enters the rotary kiln from the front section of the rotary kiln, a coal powder injection device injects coal powder from the front section of the rotary kiln, the mixed raw material powder in the rotary kiln is roasted at the roasting temperature ranging from 650 DEG C to 1,100 DEG C for 30 min, and tail gas is discharged out of the rotary kiln from an exhaust passage at the tail section of the rotary kiln; and 3, iron ore powder roasted in the rotary kiln is discharged to a cooling pond from the front section of the rotary kiln for water quenching, so that the finished product of the iron ore powder is obtained. Compared with the prior art, the grade of the iron ore powder roasted with the reduction roasting method of siderite in the rotary kiln is stable.
Description
Technical field
The present invention relates to the smelting of spathic iron ore, the method for particularly a kind of spathic iron ore rotary kiln reducing roasting.
Background technology
In recent years, China's Iron And Steel Industry grows continuously and fast increasing to the demand of iron ore, along with constantly riseing of International Iron Ore stone price, the utilization of domestic low-grade siderite more and more comes into one's own, and China's iron ore reserves feature is that lean ore is many in addition, and rich ore is few, low-grade hydrothermal solution spathic iron ore reserves are large and distribution is comparatively concentrated, be suitable for exploitation, but the hydrothermal solution spathic iron ore grade of exploiting out is low.It is large that the present invention is positioned at Hezhang County, Guizhou Province hydrothermal solution spathic iron ore reserves; Product is special; Be rich in magnesium oxide, calcium etc.; The features such as harmful element is extremely low.There is the value of roasting after very high exploitation.
Summary of the invention
Object of the present invention is just the method providing the reducing roasting of a kind of hydrothermal solution spathic iron ore rotary kiln, and the powdered iron ore grade after the method roasting of this hydrothermal solution spathic iron ore rotary kiln reducing roasting is stablized.
Technical scheme of the present invention is: the method for a kind of hydrothermal solution spathic iron ore rotary kiln reducing roasting, comprises the following steps:
1. hydrothermal solution spathic iron ore is broken into that particle diameter is less than or equal to 0.9mm, hard coal is broken into particle diameter and is less than or equal to 5mm, is fully mixed into mixing raw material powder;
2. mixing raw material powder enters rotary kiln from rotary kiln rear, the burning coal gas produced by producer gas generator enters rotary kiln from rotary kiln leading portion, coal powder injection machine carries out roasting from rotary kiln leading portion to Coal powder spray in rotary kiln to mixing raw material powder in rotary kiln, maturing temperature is 650 DEG C-1100 DEG C, the maturing temperature time is 30 minutes, by the exhaust passage of rotary kiln rear, tail gas is discharged rotary kiln;
3. the powdered iron ore after rotary kiln calcining is expelled to cooling pool from rotary kiln leading portion and carries out shrend, obtains finished iron breeze.
Compared with prior art, principle of the present invention and beneficial effect are:
The present invention is by being processed into high grade iron breeze (48-55%) by rotary kiln reducing roasting by low-grade to low-grade hydrothermal solution spathic iron ore (30-37%),, very complicated Mineral change can be there is in the roasting in a heated condition of hydrothermal solution spathic iron ore.Under different reducing atmosphere, differing temps, the mixture and fe etc. of the mixture of rhombohedral iron ore, magnetite, rhombohedral iron ore and magnetite, rhombohedral iron ore and magnetite can be generated.The starting material such as this project hydrothermal solution spathic iron ore spathic iron ore raw ore, coal gas, popular smokeless coal in rotary kiln, add thermal bake-out according to a certain percentage and cooling refining forms, and principal reaction formula is:
3FeCO
3+1/20
2＝Fe
2O
3+CO2↑
The present invention greatly can promote the mining development of China's Iron And Steel Industry mainstay industry, and forms relevant industrial chain, drives the development of its related industries.The huge low-grade hydrothermal solution spathic iron ore of development and utilization China reserves, resources advantage can be transformed into economic advantages and establish solid basis, reduce the dependence to import resources.For the state of the art of China's ore research field is greatly improved.Labour intensity is low, and starting material, fuel, reductive agent are unrestricted, wide material sources, raw ore after roasting changes original mineral formation, does not produce any mine tailing, i.e. environmental protection, economical again, comprehensive treating process is got rid of to waste gas, plays positively effect in energy-saving and emission-reduction.
Name Resolution
In grade-the present invention, grade refers to the per-cent of iron-holder in powder, and as iron content 30% in 30 product bit representation powder, in the present invention, grade is 30 for low-grade, higher than more than 50 be higher-grade.
Accompanying drawing explanation
Fig. 1 is present invention process schema schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As Fig. 1, the method for a kind of spathic iron ore rotary kiln reducing roasting, comprises the following steps:
1. Hezhang County hydrothermal solution spathic iron ore is broken into that particle diameter is less than or equal to 0.9mm, hard coal is broken into particle diameter and is less than or equal to 5mm, is fully mixed into mixing raw material powder.
2. mixing raw material powder enters rotary kiln from rotary kiln rear, and the burning coal gas produced by producer gas generator enters rotary kiln from rotary kiln leading portion, and (speed is 2000m
3/ h), coal powder injection machine carries out roasting to Coal powder spray in rotary kiln (spray speed for 500kg/h) to mixing raw material powder in rotary kiln from rotary kiln leading portion, rotary kiln rotating speed is 2r/min, and volume is 2.4m
3, installing gradient is 5 degree, and maturing temperature is 650 DEG C-1100 DEG C, and the maturing temperature time is 30 minutes, by the exhaust passage of rotary kiln rear, tail gas is discharged rotary kiln.
3. the powdered iron ore after rotary kiln calcining is expelled to cooling pool from rotary kiln leading portion and carries out shrend, obtains finished iron breeze.
Embodiment 1
1. 1000kg Hezhang County hydrothermal solution spathic iron ore is broken into particle diameter to be less than or equal to 0.9mm, 20kg hard coal and to be broken into particle diameter and to be less than or equal to 5mm, is fully mixed into mixing raw material powder.
2. mixing raw material powder enters rotary kiln from rotary kiln rear, and the burning coal gas produced by producer gas generator enters rotary kiln from rotary kiln leading portion, and (speed is 2000m
3/ h), coal powder injection machine carries out roasting to Coal powder spray in rotary kiln (spray speed for 500kg/h) to mixing raw material powder in rotary kiln from rotary kiln leading portion, rotary kiln rotating speed is 2r/min, and volume is 2.4m
3, installing gradient is 5 degree, and maturing temperature is 650 DEG C-1100 DEG C, and the maturing temperature time is 30 minutes, by the exhaust passage of rotary kiln rear, tail gas is discharged rotary kiln.
3. the powdered iron ore after rotary kiln calcining is expelled to cooling pool from rotary kiln leading portion and carries out shrend, obtains 75kg finished iron breeze.
Embodiment 2
1. 2000kg Hezhang County hydrothermal solution spathic iron ore is broken into particle diameter to be less than or equal to 0.9mm, 50kg hard coal and to be broken into particle diameter and to be less than or equal to 5mm, is fully mixed into mixing raw material powder.
2. mixing raw material powder enters rotary kiln from rotary kiln rear, the burning coal gas produced by producer gas generator enters rotary kiln (speed is 2000m3/h) from rotary kiln leading portion, coal powder injection machine carries out roasting to Coal powder spray in rotary kiln (spray speed is 500kg/h) to mixing raw material powder in rotary kiln from rotary kiln leading portion, rotary kiln rotating speed is 2r/min, and volume is 2.4m
3, installing gradient is 5 degree, and maturing temperature is 650 DEG C-1100 DEG C, and the maturing temperature time is 30 minutes, by the exhaust passage of rotary kiln rear, tail gas is discharged rotary kiln.
3. the powdered iron ore after rotary kiln calcining is expelled to cooling pool from rotary kiln leading portion and carries out shrend, obtains 145kg finished iron breeze.
Respectively the spathic iron ore raw material of embodiment 1 and 2 and powdered iron ore product are carried out respectively iron level, content of magnesia, calcium oxide content, dioxide-containing silica detection, detected result sees the following form:
Table one
Numerical value in table one is test content/example weight * 100%, and as 10 of embodiment 1 magnesium oxide hurdle powdered iron ore item refers to that sample thief weight is 100 grams, wherein magnesian content is 10 grams is 10%.
Claims (4)
1. a method for spathic iron ore rotary kiln reducing roasting, comprises the following steps:
1. hydrothermal solution spathic iron ore is broken into that particle diameter is less than or equal to 0.9mm, hard coal is broken into particle diameter and is less than or equal to 5mm, is fully mixed into mixing raw material powder;
2. mixing raw material powder enters rotary kiln from rotary kiln rear, the burning coal gas produced by producer gas generator enters rotary kiln from rotary kiln leading portion, coal powder injection machine carries out roasting from rotary kiln leading portion to Coal powder spray in rotary kiln to mixing raw material powder in rotary kiln, maturing temperature is 650 DEG C-1100 DEG C, the maturing temperature time is 30 minutes, by the exhaust passage of rotary kiln rear, tail gas is discharged rotary kiln;
3. the powdered iron ore after rotary kiln calcining is expelled to cooling pool from rotary kiln leading portion and carries out shrend, obtains finished iron breeze.
2. the method for spathic iron ore rotary kiln according to claim 1 reducing roasting, is characterized in that: described hydrothermal solution spathic iron ore is Hezhang County, Guizhou Province hydrothermal solution spathic iron ore.
3. the method for spathic iron ore rotary kiln according to claim 1 reducing roasting, is characterized in that: described rotary kiln rotating speed is 2r/min, and volume is 2.4m
3, installing gradient is 5 degree, and gas velocity is 2000m
3/ h, Coal powder spray spray speed is 500kg/h.
4. the method for the spathic iron ore rotary kiln reducing roasting according to the arbitrary claim of claim 1-3, is characterized in that: described hydrothermal solution spathic iron ore: hard coal weight ratio is 100:20-25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410534417.6A CN104263908A (en) | 2014-10-11 | 2014-10-11 | Reduction roasting method of siderite in rotary kiln |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410534417.6A CN104263908A (en) | 2014-10-11 | 2014-10-11 | Reduction roasting method of siderite in rotary kiln |
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| CN104263908A true CN104263908A (en) | 2015-01-07 |
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ID=52155481
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| CN201410534417.6A Pending CN104263908A (en) | 2014-10-11 | 2014-10-11 | Reduction roasting method of siderite in rotary kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106631055A (en) * | 2016-11-22 | 2017-05-10 | 常州思宇知识产权运营有限公司 | Preparation method of refractory material |
| CN111926176A (en) * | 2020-08-13 | 2020-11-13 | 赫章县黎明矿业有限公司 | Method for roasting siderite by belt sintering machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN102198509A (en) * | 2010-03-23 | 2011-09-28 | 郑永贤 | Method for producing iron concentrate powder by using reductive magnetizing rotary furnace |
| CN103088208A (en) * | 2013-01-16 | 2013-05-08 | 北京矿冶研究总院 | Method for treating manganese-containing and phosphorus-containing hematite |
-
2014
- 2014-10-11 CN CN201410534417.6A patent/CN104263908A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101117661A (en) * | 2006-07-31 | 2008-02-06 | 郭元杰 | Method for producing iron concentrate by brown hematite and siderite and reduction roaster |
| CN102198509A (en) * | 2010-03-23 | 2011-09-28 | 郑永贤 | Method for producing iron concentrate powder by using reductive magnetizing rotary furnace |
| CN103088208A (en) * | 2013-01-16 | 2013-05-08 | 北京矿冶研究总院 | Method for treating manganese-containing and phosphorus-containing hematite |
Non-Patent Citations (1)
| Title |
|---|
| 沈旭: "《化学选矿技术》", 31 July 2011 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106631055A (en) * | 2016-11-22 | 2017-05-10 | 常州思宇知识产权运营有限公司 | Preparation method of refractory material |
| CN111926176A (en) * | 2020-08-13 | 2020-11-13 | 赫章县黎明矿业有限公司 | Method for roasting siderite by belt sintering machine |
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Effective date of registration: 20160226 Address after: 551700, Bijie District, Guizhou Province, Hezhang County, Zhuhai City, unity village, Taiwan sand dam group Applicant after: Hezhang Liming mining industry Co., Ltd. Address before: Fuqing City, Fuzhou City Harbour Town, Fujian province accounted for 350300 Yang Village North No. 91 Applicant before: Chen Xiaozhong |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150107 |
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