CN110129550A - A kind of superfluxed pellets and preparation method thereof - Google Patents
A kind of superfluxed pellets and preparation method thereof Download PDFInfo
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- CN110129550A CN110129550A CN201910407758.XA CN201910407758A CN110129550A CN 110129550 A CN110129550 A CN 110129550A CN 201910407758 A CN201910407758 A CN 201910407758A CN 110129550 A CN110129550 A CN 110129550A
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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
- C22B1/14—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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- Environmental & Geological Engineering (AREA)
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- Inorganic Chemistry (AREA)
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Abstract
The invention belongs to metallurgical technology fields, it is related to a kind of preparation method of superfluxed pellets, including ingredient, mixing pelletizing, roasting, cooling, wherein, the granularity, drying grate thickness of feed layer and drying grate wind speed of pellet are had adjusted, the dual alkalinity of prepared superfluxed pellets is 0.8-1.4.The preparation method of superfluxed pellets of the invention makes the AC tumbler index of preheated pellets mine reduce 3 or more percentage points, substantially increases the intensity of superfluxed pellets.
Description
Technical field
The invention belongs to metallurgical technology field, it is related to a kind of superfluxed pellets and preparation method thereof, more particularly to a kind of
It can reduce the preparation method of the pellet of preheated pellets mine AC converter index.
Background technique
Superfluxed pellets is a kind of iron charge of blast furnace, and grate kiln technique is the leading work of Chinese acid pellet
Skill has the characteristics that large-scale, continuous, high temperature, closing, but produces superfluxed pellets using grate kiln roasting apparatus
When, the AC tumbler index of pre- hot-bulb is higher, and pellet is also easy to produce powder when entering rotary kiln, and rotary kiln is easily tied when high-temperature roasting
Circle influences being normally carried out for production.
It is therefore desirable to develop a kind of new high basicity pellet ore production technology, AC tumbler index is reduced.
Summary of the invention
The purpose of the present invention is in view of the drawbacks of the prior art, provide a kind of superfluxed pellets and preparation method thereof.
On the one hand, the present invention provides a kind of preparation method of superfluxed pellets, including ingredient, mix pelletizing, roasting,
It is cooling, have adjusted the granularity, drying grate thickness of feed layer and drying grate wind speed of pellet.
The preparation method of above-mentioned superfluxed pellets, the granularity of the pellet are 7mm-13mm, the drying grate material
For layer with a thickness of 130-190mm, the drying grate wind speed is 1.9-2.1m/s.
The preparation method of above-mentioned superfluxed pellets, drying grate dryer section box temperature are 210-220 DEG C.
The preparation method of above-mentioned superfluxed pellets, the pelletizing that mixes obtain the ball that moisture content is 9.1%-9.6%
Group.
The preparation method of above-mentioned superfluxed pellets, the ingredient include Iron Ore Powder, lime stone and bentonite.
The preparation method of above-mentioned superfluxed pellets, the Iron Ore Powder are Shanxi Lvliang City ground hematite.
On the other hand, the present invention provides a kind of superfluxed pellets, the dual alkalinity of the superfluxed pellets is
0.8-1.4。
Technical solution of the present invention have it is following the utility model has the advantages that
The preparation method of superfluxed pellets of the invention, improve the granularity of pellet, the thickness of feed layer of drying grate and
The temperature of drying grate blasting drying period bellows, the AC tumbler index of obtained preheated pellets mine reduce 3 or more percentage points,
Substantially increase the intensity of superfluxed pellets.
Specific embodiment
In order to fully understand the purpose of the present invention, feature and effect, by following specific embodiments, the present invention is made detailed
It describes in detail bright.For process of the invention in addition to following the description, remaining is all made of the conventional method or device of this field.Following nouns
Term is unless otherwise stated, all have the normally understood meaning of those skilled in the art.
On the one hand, the present invention provides a kind of preparation method of superfluxed pellets, including ingredient, mix pelletizing, roasting,
It is cooling, wherein to have adjusted the granularity, drying grate thickness of feed layer and drying grate wind speed of pellet.
In some preferred embodiments, the thickness of feed layer is 130-190mm, and the drying grate wind speed is 1.9-
2.1m/s, the dryer section box temperature are 210-220 DEG C.
The present invention improves granularity, thickness of feed layer and the drying grate drum of pellet using grate kiln technique
The temperature of wind dryer section bellows can reduce the AC tumbler index of obtained preheated pellets mine by 3 or more percentage points.
Optionally, in some embodiments, the ingredient includes the agstone of 50-90 parts by weight, 850-950 weight
The Iron Ore Powder of part and the bentonite of 8-15 parts by weight.Wherein, the ratio of the ingredient can be according to lime stone, Iron Ore Powder and bentonite
Type or the difference of grade and it is different.
Optionally, CaO content is 51.7% in the agstone, and ratio of the partial size less than 0.044mm is 78%.
Wherein, the pelletizing that mixes obtains the pelletizing that moisture content is 9.1%-9.6%, and the moisture content of pelletizing is to guarantee its matter
Excellent essential condition is measured, through test of many times, for inventor's discovery when moisture content is 9.1%-9.6%, the performance of pelletizing is best.
Wherein, the average grain diameter of the pelletizing is 7mm-13mm.
Preferably, the Iron Ore Powder is Shanxi Lvliang City ground hematite.Shanxi Lvliang City ground hematite granularity is less than
The content of 0.037mm (400 mesh) is 92%, ground hematite Iron grade 64.8%, SiO2For 3.7%, FeO 7.6%.
Wherein, the roasting and cooling step are this field conventional technology, and the present invention does not do specific limit herein
It is fixed.
Wherein, the bentonite is the conventional bentonite bought often.
On the other hand, the present invention provides a kind of superfluxed pellets, the dual alkalinity of the superfluxed pellets is
0.8-1.4.Wherein, the dual alkalinity is CaO/SiO2Ratio.
Embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.In the following examples, the experimental methods for specific conditions are not specified, according to conventional methods and conditions.Following implementation
Raw material used in example is that conventional market purchase obtains.
Benchmark embodiment
Benchmark embodiment is the production stage of conventional high basicity pellet, specific as follows:
(1) ingredient
Iron Ore Powder, agstone, bentonite carry out weighing ingredient by following weight parts, specific to match are as follows:
60 parts of agstone
918 parts of Iron Ore Powder
12 parts of bentonite,
Wherein Iron Ore Powder is Shanxi Lvliang City ground hematite, and the content that granularity is less than 0.037mm (400 mesh) is 92%, red iron
Miberal powder Iron grade is 64.8%, SiO2For 3.7%, FeO 7.6%.The CaO content of agstone is 51.7%, and partial size is less than
The ratio of 0.044mm is 78%, and bentonite is the conventional bentonite of market purchase.
(2) pelletizing is mixed
Above-mentioned agstone, Iron Ore Powder and bentonite are mixed through batch mixer, is then added in disc balling machine and supplements water
Pelletizing produces pelletizing, obtains the pelletizing that moisture content is 9.3% (by weight percentage), average grain diameter 9mm-16mm.
(3) it roasts
Cloth, roasting are carried out on grate kiln roasting apparatus, obtain finished pellet.Wherein, the bed of material is thick when cloth
Degree is 200mm, and wind speed is 1.8m/s in drying grate, and drying grate blasting drying period box temperature is 230-250 DEG C, preheats II section of cigarette
1150-1160 DEG C of cover temperature.
Through detecting, the dual alkalinity (CaO/SiO of finished ball nodulizing2) it is 0.9, the AC tumbler index of pre- hot-bulb is
7.13%.
Said reference example shows that the superfluxed pellets of routinely technique production, the AC tumbler index of pre- hot-bulb are
7.13%, much higher than the standard less than 5% of custom requirements, powder is too many when into rotary kiln baking, the easy ring formation of rotary kiln.
Embodiment 1
When the present embodiment produces superfluxed pellets, relative to benchmark embodiment, the granularity of pellet is only had adjusted, chain is combed
The thickness of feed layer and wind speed of machine.Wherein, the granularity of pellet is adjusted to 7mm-13mm by 9-16mm, when cloth thickness of feed layer by
200mm is adjusted to 180mm, and wind speed is adjusted to 2.1m/s by 1.8m/s in drying grate, drying grate blasting drying period box temperature by
230-250 DEG C is adjusted to 210-220 DEG C.Specific step is as follows.
(1) ingredient
Iron Ore Powder, agstone, bentonite carry out weighing ingredient by following weight parts, specific to match are as follows:
60 parts of agstone
928 parts of Iron Ore Powder
12 parts of bentonite
Wherein, Iron Ore Powder is Shanxi Lvliang City ground hematite, and the content that granularity is less than 0.037mm (400 mesh) is 92%, red iron
Miberal powder Iron grade is 64.8%, SiO2For 3.7%, FeO 7.6%.The CaO content of agstone is 51.7%, and partial size is less than
The ratio of 0.044mm is 78%, and bentonite is the conventional bentonite of market purchase.
(2) pelletizing is mixed
Above-mentioned agstone, Iron Ore Powder and bentonite are mixed through batch mixer, is then added in disc balling machine and supplements water
Pelletizing produces pelletizing, obtains the pelletizing that moisture content is 9.3% (by weight percentage), average grain diameter 7mm-13mm.
(3) it roasts
Cloth, roasting are carried out on grate kiln roasting apparatus, obtain finished pellet.Wherein, the bed of material is thick when cloth
Degree is 180mm, and wind speed is 2.1m/s in drying grate, preheats II section of 1150-1160 DEG C of petticoat pipe temperature, drying grate blasting drying period wind
Box temperature is 210-220 DEG C.
Through detecting, the dual alkalinity (CaO/SiO of finished ball nodulizing2) it is 0.9, the AC tumbler index of pre- hot-bulb is
4.11%.
Embodiment 2
When the present embodiment produces superfluxed pellets, relative to benchmark embodiment, the granularity of pellet is only had adjusted, chain is combed
The thickness of feed layer and wind speed of machine, wherein the granularity of pellet is adjusted to 7mm-13mm by 9-16mm, when cloth thickness of feed layer by
200mm is adjusted to 160mm, and wind speed is adjusted to 2.0m/s by 1.8m/s in drying grate.Specific step is as follows.
(1) ingredient:
Iron Ore Powder, agstone, bentonite carry out weighing ingredient by following weight parts, specific to match are as follows:
60 parts of agstone
928 parts of Iron Ore Powder
12 parts of bentonite,
Wherein, Iron Ore Powder is Shanxi Lvliang City ground hematite, and the content that granularity is less than 0.037mm (400 mesh) is 92%, red iron
Miberal powder Iron grade is 64.8%, SiO2For 3.7%, FeO 7.6%.The content of the CaO of agstone is 51.7%, and partial size is small
It is 78% in the ratio of 0.044mm, bentonite is the conventional bentonite of market purchase.
(2) pelletizing is mixed
Above-mentioned agstone, Iron Ore Powder and bentonite are mixed through batch mixer, is then added in disc balling machine and supplements water
Pelletizing produces pelletizing, obtains the pelletizing that moisture content is 9.3% (by weight percentage), average grain diameter 7mm-13mm.
(3) it roasts
Cloth, roasting are carried out on grate kiln roasting apparatus, obtain finished pellet.Wherein, the bed of material is thick when cloth
Degree is 160mm, and wind speed is 2.0m/s in drying grate, preheats II section of 1150-1160 DEG C of petticoat pipe temperature, drying grate blasting drying period wind
Box temperature is 210-220 DEG C.
Through detecting, the dual alkalinity (CaO/SiO of finished ball nodulizing2) it is 0.9, the AC tumbler index of pre- hot-bulb is
3.87%.
Embodiment 3
When the present embodiment produces superfluxed pellets, relative to benchmark embodiment, the granularity of pellet is only had adjusted, chain is combed
The thickness of feed layer and wind speed of machine, wherein the granularity of pellet is adjusted to 7mm-13mm by 9-16mm, when cloth thickness of feed layer by
200mm is adjusted to 140mm, and wind speed is adjusted to 1.9m/s by 1.8m/s in drying grate.Specific step is as follows.
(1) ingredient:
Iron Ore Powder, agstone, bentonite carry out weighing ingredient by following weight parts, specific to match are as follows:
60 parts of agstone
928 parts of Iron Ore Powder
12 parts of bentonite,
Wherein, Iron Ore Powder is Shanxi Lvliang City ground hematite, and the content that granularity is less than 0.037mm (400 mesh) is 92%, red iron
Miberal powder Iron grade is 64.8%, SiO2For 3.7%, FeO 7.6%.The content of the CaO of agstone is 51.7%, and partial size is small
It is 78% in the ratio of 0.044mm, bentonite is the conventional bentonite of market purchase.
(2) pelletizing is mixed
Above-mentioned agstone, Iron Ore Powder and bentonite are mixed through batch mixer, is then added in disc balling machine and supplements water
Pelletizing produces pelletizing, obtains the pelletizing that moisture content is 9.3% (by weight percentage), average grain diameter 7mm-13mm.
(3) it roasts
Cloth, roasting are carried out on grate kiln roasting apparatus, obtain finished pellet.Wherein, the bed of material is thick when cloth
Degree is 140mm, and wind speed is 1.9m/s in drying grate, preheats II section of 1150-1160 DEG C of petticoat pipe temperature, drying grate blasting drying period wind
Box temperature degree is 210-220 DEG C.
Through detecting, the dual alkalinity (CaO/SiO of finished ball nodulizing2) it is 0.9, the AC tumbler index of pre- hot-bulb is
3.64%.
Embodiment 4
The present embodiment produces the superfluxed pellets that basicity is 1.1, wherein other than the content shown in the present embodiment,
All operating methods are identical with benchmark embodiment.Specific manufacturing method is as follows:
(1) ingredient:
Iron Ore Powder, agstone, bentonite carry out weighing ingredient by following weight parts, specific to match are as follows:
77 parts of agstone
911 parts of Iron Ore Powder
12 parts of bentonite,
Wherein, Iron Ore Powder is Shanxi Lvliang City ground hematite, and the content that granularity is less than 0.037mm (400 mesh) is 92%, red iron
Miberal powder Iron grade is 64.8%, SiO2For 3.7%, FeO 7.6%.The content of the CaO of agstone is 51.7%, and partial size is small
It is 78% in the ratio of 0.044mm, bentonite is the conventional bentonite of market purchase.
(2) pelletizing is mixed
Above-mentioned agstone, Iron Ore Powder and bentonite are mixed through batch mixer, is then added in disc balling machine and supplements water
Pelletizing produces pelletizing, obtains the pelletizing that moisture content is 9.3% (by weight percentage), average grain diameter 7mm-13mm.
(3) it roasts
Cloth, roasting are carried out on grate kiln roasting apparatus, obtain finished pellet.Wherein, the bed of material is thick when cloth
Degree is 140mm, and wind speed is 1.9m/s in drying grate, preheats II section of 1150-1160 DEG C of petticoat pipe temperature, drying grate blasting drying period wind
Box temperature degree is 210-220 DEG C.
Through detecting, the dual alkalinity (CaO/SiO of finished ball nodulizing2) it is 1.1, the AC tumbler index of pre- hot-bulb is 4.07%
Data analysis
Above-described embodiment shows for embodiment 1, when producing the superfluxed pellets that basicity is 0.9, by the grain of pellet
Degree is adjusted to 7mm-13mm by 9-16mm, and thickness of feed layer is adjusted to 180mm by 200mm when cloth, and wind speed is by 1.8m/ in drying grate
S is adjusted to 2.1m/s, when drying grate blasting drying period box temperature is adjusted to 210-220 DEG C by 230-250 DEG C, preheated pellets
The AC tumbler index of mine is reduced to 4.11% by the 7.13% of benchmark example.
Embodiment 2 is adjusted the granularity of pellet by 9-16mm when producing the superfluxed pellets that basicity is 0.9
For 7mm-13mm, thickness of feed layer is adjusted to 160mm by 200mm when cloth, and wind speed is adjusted to 2.0m/s by 1.8m/s in drying grate
When, when drying grate blasting drying period box temperature is adjusted to 210-220 DEG C by 230-250 DEG C, compared with benchmark example, pre- hot-bulb
The AC tumbler index of nodulizing is reduced to 3.87% by the 7.13% of benchmark example.
Embodiment 3 is adjusted the granularity of pellet by 9-16mm when producing the superfluxed pellets that basicity is 0.9
For 7mm-13mm, thickness of feed layer is adjusted to 140mm by 200mm when cloth, and wind speed is adjusted to 1.9m/s by 1.8m/s in drying grate,
When drying grate blasting drying period box temperature is adjusted to 210-220 DEG C by 230-250 DEG C, compared with benchmark example, preheated pellets
The AC tumbler index of mine is reduced to 3.64% by the 7.13% of benchmark example.
Embodiment 4 is adjusted the granularity of pellet by 9-16mm when producing the superfluxed pellets that basicity is 1.1
For 7mm-13mm, thickness of feed layer is adjusted to 140mm by 200mm when cloth, and wind speed is adjusted to 1.9m/s by 1.8m/s in drying grate,
When drying grate blasting drying period box temperature is adjusted to 210-220 DEG C by 230-250 DEG C, compared with benchmark example, preheated pellets
The AC tumbler index of mine is reduced to 4.07% by the 7.13% of benchmark example.
In conclusion the superfluxed pellets produced using method provided by the invention, can reduce the AC of preheated pellets mine
Tumbler index.
The present invention is hereinbefore disclosed with preferred embodiment, but it should be understood by those skilled in the art that, these
Embodiment is only used for describing the present invention, but should not be understood as limiting the scope of the invention.It should be noted that all implement with these
Example equivalent variation and displacement, should all be set as being covered by scope of the presently claimed invention.Therefore, protection scope of the present invention
It should be subject to range defined in claims.
Claims (7)
1. a kind of preparation method of superfluxed pellets, including ingredient, mixing pelletizing, roasting, cooling, which is characterized in that adjustment
The granularity of pellet, drying grate thickness of feed layer and drying grate wind speed.
2. the preparation method of superfluxed pellets according to claim 1, which is characterized in that the granularity of the pellet is
7mm-13mm, the drying grate thickness of feed layer are 130-190mm, and the drying grate wind speed is 1.9-2.1m/s.
3. the preparation method of superfluxed pellets according to claim 2, which is characterized in that drying grate dryer section bellows temperature
Degree is 210-220 DEG C.
4. the preparation method of superfluxed pellets according to claim 1, which is characterized in that the mixing pelletizing is contained
Water rate is the pelletizing of 9.1%-9.6%.
5. the preparation method of superfluxed pellets according to claim 1, which is characterized in that the ingredient includes iron ore
Powder, lime stone and bentonite.
6. the preparation method of superfluxed pellets according to claim 5, which is characterized in that the Iron Ore Powder is Shanxi Lyu
Beam ground hematite.
7. superfluxed pellets described in any one of claims 1-6, which is characterized in that the diacidic base of the superfluxed pellets
Degree is 0.8-1.4.
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| CN201910407758.XA CN110129550A (en) | 2019-05-16 | 2019-05-16 | A kind of superfluxed pellets and preparation method thereof |
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| CN201910407758.XA CN110129550A (en) | 2019-05-16 | 2019-05-16 | A kind of superfluxed pellets and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930612A (en) * | 2021-10-15 | 2022-01-14 | 四川德胜集团钒钛有限公司 | Limestone alkaline pellet and preparation process thereof |
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|---|---|---|---|---|
| US4145210A (en) * | 1976-02-24 | 1979-03-20 | Sumitomo Metal Industries, Ltd. | Process for indurating dried pellets in a rotary kiln |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN102102147A (en) * | 2009-12-17 | 2011-06-22 | 鞍钢集团矿业公司 | Process for producing magnesium pellet by grate rotary kiln |
| CN109371232A (en) * | 2018-11-28 | 2019-02-22 | 山西太钢不锈钢股份有限公司 | For reducing the method for pellet expansion rate |
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2019
- 2019-05-16 CN CN201910407758.XA patent/CN110129550A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4145210A (en) * | 1976-02-24 | 1979-03-20 | Sumitomo Metal Industries, Ltd. | Process for indurating dried pellets in a rotary kiln |
| CN102102147A (en) * | 2009-12-17 | 2011-06-22 | 鞍钢集团矿业公司 | Process for producing magnesium pellet by grate rotary kiln |
| CN102031364A (en) * | 2010-12-17 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for enhancing intensity of ground hematite pellet preheated pellets |
| CN109371232A (en) * | 2018-11-28 | 2019-02-22 | 山西太钢不锈钢股份有限公司 | For reducing the method for pellet expansion rate |
Non-Patent Citations (1)
| Title |
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| 张汉泉: "链篦机- 回转窑铁矿氧化球团干燥预热工艺参数研究", 《矿冶》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113930612A (en) * | 2021-10-15 | 2022-01-14 | 四川德胜集团钒钛有限公司 | Limestone alkaline pellet and preparation process thereof |
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| CB02 | Change of applicant information |
Address after: 030003, Shanxi, Taiyuan, pointed lawn area, lawn street, No. 2 Applicant after: Shanxi Taigang Stainless Steel Co.,Ltd. Address before: 030003 Taiyuan science and technology center, Shanxi 2 Applicant before: Shanxi Taigang Stainless Steel Co.,Ltd. |
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Application publication date: 20190816 |
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