CN105525091B - A kind of method of roasting of speculum iron at high proportion - Google Patents
A kind of method of roasting of speculum iron at high proportion Download PDFInfo
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- CN105525091B CN105525091B CN201610056164.5A CN201610056164A CN105525091B CN 105525091 B CN105525091 B CN 105525091B CN 201610056164 A CN201610056164 A CN 201610056164A CN 105525091 B CN105525091 B CN 105525091B
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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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
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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
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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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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Abstract
The invention discloses a kind of method of roasting of speculum iron at high proportion, belong to pelletizing production technical field.Groped by experimental study, practice, continue to optimize and improve existing grate-kiln pelletizing process producing line technology and equipment, optimum thermal parameter is obtained in each drying of grate kiln, furnace zone, obtain the breakthrough of bloodstone roasting technology, so that especially qualified finished pellet is stablized in specularite pellets production acquisition to bloodstone at high proportion, the method for gradually forming a set of mature and stable roasting of speculum iron at high proportion, improve the practical level of hematite pellets technology, economic benefit is obvious, and it is great to promote reference.
Description
Technical field
The present invention relates to a kind of method of roasting of speculum iron at high proportion, belong to pelletizing production technical field.
Background technology
The fine iron breeze that grate-kiln pelletizing production line uses be it is a kind of containing bloodstone, magnetic iron ore, speculum iron and
In the bulk concentrate of limonite, wherein raw ore matching based on speculum iron, ratio accounts for more than 60%.Speculum iron is general in geology
Formed by hydrothermal process, deposition or diagenism, fusing point reaches as high as 1594 DEG C, causes solid phase in roasting process
The temperature of consolidation and each drying, furnace zone temperature are homogeneously in requisition for improve, and the high-temperature simultaneously bi-directionally required is dry, roasting work
Skill proposes higher requirement to production process control, and roasting cost also accordingly raises.And speculum iron is the mutation of bloodstone,
Not heat release in preheating, roasting process.Given birth to for such a complicated iron ore concentrate based on speculum iron using grate kiln technique
Pellet is produced, is at home and abroad all had no precedent to go by, meets specularite pellets thermal regulation at high proportion therefore, formulating, optimization production
Wiring technology and equipment, steady production, meet companies needs, it is extremely urgent.
The content of the invention
The present invention is intended to provide a kind of method of roasting of speculum iron at high proportion, has determined and has met speculum iron ball at high proportion
Group's thermal regulation, optimizes production-line technique and equipment, solves such a containing bloodstone, magnetic iron ore, speculum iron and limonite
COMPLEX MIXED concentrate use grate kiln technique productions pellet problem.
A kind of method of roasting of speculum iron at high proportion provided by the invention, the weight proportion of speculum iron is 60% ~ 75%.
The method of roasting of speculum iron at high proportion of the present invention, comprises the following steps：
Pelletizing step：Concentrate drying-high pressure roller mill-dispensing-pelletizing-drying, preheating-roasting-central cooler cooling
1. concentrate drying：It is partially dehydrated that concentrate is carried out on demand.
2. high pressure roller mill：Concentrate pre-processes.
3. dispensing：By binding agent（Pelletizing typically uses bentonite）Supplying fine ore simultaneously mixes.
4. pelletizing：Compound after mixing is made to particle diameter 9-16mm green-ball through balling equipment.
5. dry, preheating：Carried out in drying grate, drying grate is divided into forced air drying, exhausting is dry, preheats I sections, preheating II
Section, dryer section is completely out by green-ball moisture, and preheating section is heated up green-ball with appropriate temperature gradient, and following thermal regulation has
Embody.
6. it is calcined：Carried out in rotary kiln, pre- hot-bulb is uniformly calcined in high temperature, forms Partial Liquid Phase, improves ball
Group's intensity.
7. cool down：Carried out in central cooler, high temperature pelletizing is cooled down stage by stage, and be back to use according to discarded temperature other
Point.
The method of roasting of speculum iron at high proportion of the present invention, the improvement to pelletizing process include herein below：
（1）Increase Pretreatment by high pressure roller grinding technology：
Pretreatment by high pressure roller grinding have improve iron ore concentrate specific surface area and fine particle content, change granule-morphology feature,
Increase rough and forming portion divides gap and fresh surface, reduction bentonite ore ratio, improvement pelletizing preheating and baking are special
The effect of property, at a temperature of same heat power engineering system, improves pre- hot-bulb, pelletizing crushing strength.
Concrete operations in the present invention on high pressure roller mill：Pressure is maintained at 40-60bar in roller mill, and granularity is after roller mill：
85-90%, miberal powder specific surface area >=2000cm are accounted for less than 0.037mm grades2/g。
（2）Drying grate preheats I, II section concurrent heating technique and coal rifle and injection technology：
For speculum iron grate-kiln pelletizing production technology at high proportion, maximum difficult point is that heat release is few, causes
Levels preheated ball difference is big.Preheating temperature, which is improved, for this situation and extends the two kinds of solutions of high temperature preheating time does
Method.
A, preheating I, II section petticoat pipe partition wall height is improved：Lifted by former 400mm to 900mm, hot blast is increased by sectional area
To 4m2, extend 1.5-4 minutes high temperature preheating time of green-ball, make the heating gradient of whole preheating section gentle, improve drying grate material
The intensity of Ceng Zhong lower floors ball.
B, exploitation is applied to spray gun and the corresponding blowing process that drying grate II section of coal powder injection of preheating uses：
In preheating II sections, coal powder lance is set, its pipette tips extends longitudinally into drying grate preheating II section 1500mm by drying grate head,
Flame conditions is formed 600mm coal column after being sprayed for coal dust by adjusting injection parameter, burnt on coal column top, flame it is long and
Concentrate, effectively avoid chute body and shovel flitch；
（3）Improve roasting thermal regulation
Because speculum iron roasting particularity, whole pelletizing process thermal regulation grope and it is incremental, by 60%
Speculum iron matches somebody with somebody ore deposit to 75% speculum iron, progressively finds out a set of specularite pellets thermal regulation at high proportion：
1. blasting drying period：Temperature≤100 DEG C of petticoat pipe, the temperature of bellows：190~220 DEG C；
Down-draft drying zone：The temperature of petticoat pipe：380~440 DEG C, the temperature of bellows：130~230 DEG C；
I section of preheating：780 DEG C of the temperature ＞ of petticoat pipe, the temperature of bellows：300~400 DEG C；
II section of preheating：The temperature of petticoat pipe：Summer control is at 1100~1150 DEG C, and winter control is at 1130~1180 DEG C, wind
The temperature of case：520~600 DEG C；
2. the temperature of kiln hood seal closure is：1180~1200 DEG C；The temperature of kiln tail seal closure is：940~980 DEG C；
3. the temperature that cold one section of ring is：900~1050 DEG C；
The temperature that cold two sections of ring is：700~900 DEG C；
The temperature that cold three sections of ring is：300~400 DEG C；
The temperature that cold four sections of ring is：≤100℃；
（4）The cold 4 sections of hot blast recycling technologies of ring
Cold 4 sections of hot blast of ring is passed through into return duct towards the cooling blower entrance towards cold one section of ring, to recycle.
The coal powder injection state modulator exists：Coal powder injection pressure 0.04MPa, combustion-supporting wind pressure 15kPa, 230~240m of flow3/
min。
The structure of the coal powder lance：Coal powder lance muzzle is divided into three passages, and medial center is interior wind passage, outermost layer passage
It is mixed coal wind duct between interior wind passage and exogenous wind passage for exogenous wind passage；The outer wall of exogenous wind passage is made up of refractory material；Spray
Pressure gauge is provided with the middle part of rifle, pressure gauge side is provided with FlexbleJoint, combustion air inlet duct, combustion air are provided with below pressure gauge
Inlet duct is provided with the first regulating valve；Combustion air inlet duct is connected with fuel inlet conduit by bend pipe, is set on the bend pipe
There is the second regulating valve；Coal wind inlet duct is provided with above fuel inlet conduit, fuel inlet conduit is with coal wind inlet duct into 30 °
Angle.
Beneficial effects of the present invention：
(1) the present invention is applied to high proportion specularite pelletizing production, and the addition of speculum iron is up to 75%；
(2) pelletizing production technique of the invention improves thermal regulation with reference to domestic grate kiln-ring pelletizing process,
Qualified pellet is finally made；
(3) the structure of coal powder lance is improved, and adjusts the coal that injection parameter makes flame conditions form 600mm after being sprayed for coal dust
Post, burnt on coal column top, flame is long and concentrates, and effectively avoids chute body and shovel flitch.
Brief description of the drawings
Fig. 1 is the profile of gun head.
Fig. 2 is the structural representation for the coal powder lance that preheating II sections are set.
1 is interior wind passage in figure, and 2 be exogenous wind passage, and 3 be mixed coal wind duct, and 4 be refractory material, and 5 be pressure gauge, and 6 be ripple
Line compensator, 7 be combustion air inlet duct, and 8 be the first regulating valve, and 9 be fuel inlet conduit, and 10 be bend pipe, and 11 be the second tune
Valve is saved, 12 be coal wind inlet duct, and 13 be gun head.
Embodiment
The present invention is further illustrated below by embodiment, but is not limited to following examples.
Lanxian County mining company home-made concentrate bloodstone content is more than 80%, and raw ore amount of allocating is based on speculum iron, present mirror
The addition of iron ore is maintained at the 75% of gross weight, and pelletizing process is with reference to domestic grate kiln-ring pelletizing process, but herein
On the basis of be directed to haze ore deposit feature, add process procedure, whole pelletizing process is more suitable for the roasting of speculum iron at high proportion.
（1）Raw material can use profit mill and high pressure roller mill technique, solve the problems, such as powder particle size.In this patent, using high pressure roller
Mill pretreatment concentrate technology, mainly increase the ratio of miberal powder specific surface area and grade.
Include the raw material of following weight proportion：
Speculum iron 75%；Conglomerate ore deposit 10%, quartz type ore deposit 15%
Roller grinding process parameter：Pressure is 40-60bar in roller mill, and roller gap is 25mm；
Specific surface area is ＞ 2000cm after roller mill2/ g accounts for 85-90% less than 0.037mm granularities；
（2）In preheating I, II section increase concurrent heating technique and develop supporting coal rifle and injection technology.
Coal powder injection pressure 0.04MPa, combustion-supporting wind pressure 15kPa, 230~240m of flow3/min。
As shown in Figure 1 and 2, the structure of preheating II section coal powder lances is：Coal powder lance muzzle is divided into three passages, and medial center is
Interior wind passage 1, outermost layer passage are exogenous wind passage 2, are mixed coal wind duct 3 between interior wind passage 1 and exogenous wind passage 2；Exogenous wind leads to
The outer wall in road 2 is made up of refractory material 4；Pressure gauge 5 is provided with the middle part of spray gun, the side of pressure gauge 5 is provided with FlexbleJoint 6, pressure
The lower section of table 5 is provided with combustion air inlet duct 7, and combustion air inlet duct 7 is provided with the first regulating valve 8；Combustion air inlet duct 7 with
Fuel inlet conduit 9 is connected by bend pipe 10, and bend pipe 10 is provided with the second regulating valve 11；The top of fuel inlet conduit 9 is provided with coal
Wind inlet duct 12, fuel inlet conduit 9 and coal wind inlet duct 12 are into 30 ° of angles.
（3）Improve roasting thermal regulation
1. blasting drying period：Temperature≤100 DEG C of petticoat pipe, the temperature of bellows：190~220 DEG C；
Down-draft drying zone：The temperature of petticoat pipe：380~440 DEG C, the temperature of bellows：130~230 DEG C；
I section of preheating：780 DEG C of the temperature ＞ of petticoat pipe, the temperature of bellows：300~400 DEG C；
II section of preheating：The temperature of petticoat pipe：Summer control is at 1100~1150 DEG C, and winter control is at 1130~1180 DEG C, wind
The temperature of case：520~600 DEG C；
2. the temperature of kiln hood seal closure is：1180~1200 DEG C；The temperature of kiln tail seal closure is：940~980 DEG C；
3. the temperature that cold one section of ring is：900~1050 DEG C；
The temperature that cold two sections of ring is：700~900 DEG C；
The temperature that cold three sections of ring is：300~400 DEG C；
The temperature that cold four sections of ring is：≤100℃；
（4）The cold 4 sections of hot waste gas of ring are changed to reuse by line, reduce heat loss.
Technical scheme provided by the invention is on probation in the expansion of pelletizing portion of Lanxian County mining company, has realized up to 75% mirror
The pellet roasting of iron ore, the daily output is more than 7500 tons, and coefficient of stabilization is up to more than 95%.
Claims (3)
- A kind of 1. method of roasting of speculum iron at high proportion, it is characterised in that：Comprise the following steps：Concentrate drying-high pressure roller mill- Dispensing-pelletizing-drying, preheating-roasting-central cooler cooling；The speculum iron account for the proportioning of raw material gross weight for 60% ~ 75%；The method of roasting specifically includes herein below：（1）Increase Pretreatment by high pressure roller grinding technology：The concrete operations of high pressure roller mill：Pressure is maintained at 40-60bar in roller mill, and granularity is after roller mill：Less than 0.037mm grades Account for 85-90%, miberal powder specific surface area >=2000cm2/g；（2）Drying grate preheats I, II section concurrent heating technique：Preheating I, II section petticoat pipe partition wall height is improved, extends 1.5-4 minutes high temperature preheating time of green-ball, makes whole preheating section Heating gradient is gentle, improves the intensity of lower floor's ball in the drying grate bed of material；（3）Coal rifle and injection technology：Exploitation is applied to drying grate and preheats spray gun and the corresponding blowing process that II section of coal powder injection uses：Coal powder lance is set in preheating II sections, its pipette tips extends longitudinally into drying grate preheating II section 1500mm by drying grate head, passed through Adjustment injection parameter makes flame conditions form 600mm coal column after being sprayed for coal dust, is burnt on coal column top, and flame is long and collects In, effectively avoid chute body and shovel flitch；The structure of the coal powder lance is：Coal powder lance muzzle is divided into three passages, and medial center is interior wind passage, and outermost layer passage is Exogenous wind passage, it is mixed coal wind duct between interior wind passage and exogenous wind passage；The outer wall of exogenous wind passage is made up of refractory material；Spray gun Middle part is provided with pressure gauge, and pressure gauge side is provided with FlexbleJoint, is provided with combustion air inlet duct below pressure gauge, combustion air enters Mouth pipeline is provided with the first regulating valve；Combustion air inlet duct is connected with fuel inlet conduit by bend pipe, and the bend pipe is provided with Second regulating valve；Coal wind inlet duct is provided with above fuel inlet conduit, fuel inlet conduit presss from both sides with coal wind inlet duct into 30 ° Angle；（4）Improve roasting thermal regulation1. blasting drying period：Temperature≤100 DEG C of petticoat pipe, the temperature of bellows：190~220 DEG C；Down-draft drying zone：The temperature of petticoat pipe：380~440 DEG C, the temperature of bellows：130~230 DEG C；I section of preheating：780 DEG C of the temperature ＞ of petticoat pipe, the temperature of bellows：300~400 DEG C；II section of preheating：The temperature of petticoat pipe：Summer control is at 1100~1150 DEG C, and winter is controlled at 1130~1180 DEG C, bellows Temperature：520~600 DEG C；2. the temperature of kiln hood seal closure is：1180~1200 DEG C；The temperature of kiln tail seal closure is：940~980 DEG C；3. the temperature that cold one section of ring is：900~1050 DEG C；The temperature that cold two sections of ring is：700~900 DEG C；The temperature that cold three sections of ring is：300~400 DEG C；The temperature that cold four sections of ring is：≤100℃；（5）The cold 4 sections of hot blast recycling technologies of ringCold 4 sections of hot blast of ring is passed through into return duct towards the cooling blower entrance towards cold one section of ring, to recycle.
- 2. the method for roasting of speculum iron at high proportion according to claim 1, it is characterised in that：The step（2）In, improve Preheat I, II section petticoat pipe partition wall height：Lifted by former 400mm to 900mm, hot blast increases to 4m by sectional area2。
- 3. the method for roasting of speculum iron at high proportion according to claim 1, it is characterised in that：The injection parameters For：Coal powder injection pressure 0.04MPa, combustion-supporting wind pressure 15kPa, 230~240m of flow3/min。
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| CN108680003B (en) * | 2018-05-31 | 2024-01-19 | 新吉电(吉林)工程技术有限公司 | Rectangular shaft furnace for roasting ferrochrome pellets and roasting method thereof |
| CN110453067B (en) * | 2019-09-11 | 2021-01-26 | 中南大学 | Preparation process of fluorine-containing iron ore roasted pellets |
| CN111575479B (en) * | 2020-07-07 | 2021-09-14 | 中冶北方（大连）工程技术有限公司 | Method for producing oxidized pellet by specularite |
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| CN102031364B (en) * | 2010-12-17 | 2012-10-03 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN103834801B (en) * | 2014-03-21 | 2015-09-23 | 山西太钢不锈钢股份有限公司 | A kind of method improving magnetite powder pellet quality |
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