CN104087746A - Preparation method of magnesium titanium-containing pellets - Google Patents
Preparation method of magnesium titanium-containing pellets Download PDFInfo
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- CN104087746A CN104087746A CN201410336403.3A CN201410336403A CN104087746A CN 104087746 A CN104087746 A CN 104087746A CN 201410336403 A CN201410336403 A CN 201410336403A CN 104087746 A CN104087746 A CN 104087746A
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Abstract
The invention discloses a preparation method of magnesium titanium-containing pellets and belongs to the technical field of pellet production for blast furnace ironmaking. The preparation method comprises the following steps: adding 1.3-3.5 parts by weight of magnesium oxide powder into 95.9-98.2 parts by weight of titanium concentrate powder, then, adding 0.5-0.6 part by weight of bentonite as a mixed material, and uniformly mixing by using mixing equipment, adding water, pelletizing by using the mixed material in a disc balling machine to obtain fresh pellets; and sequentially drying, preheating, roasting and cooling the fresh pellets to obtain the magnesium titanium-containing pellets. By adding the titanium concentrate powder and magnesium oxide powder, the problems that the reduction degree of titanium-containing pellets is low, the reduction swelling rate and low temperature reduction pulverization rate are high, and molten drop performance is poor can be effectively improved, meanwhile the magnesium oxide powder is finely ground to the fact that particles with particle diameters less than 44 micrometers reach more than 80 percent, the bentonite ratio during a titanium fine powder pelletizing process can be reduced, so that the content of SiO2 of titanium-containing pellets is reduced, and the magnesium low-silicon titanium-containing pellets are obtained.
Description
Technical field
The invention belongs to blast furnace ironmaking iron ore pellets production technical field, particularly a kind of preparation method of magnesia titaniferous pellet.
Background technology
Titaniferous pellet is one of main furnace retaining material of using of blast furnace.Due to blast-furnace smelting, during to the middle and later periods, all need to carry out furnace retaining, extend its Production Life.The main raw material that blast furnace protecting is used is at present titaniferous lump ore or titaniferous pellet.The quality of furnace retaining material and performance are extremely important to the stable smooth operation of blast-furnace smelting and life-span.Because the resource of titaniferous lump ore is less, so the demand of titaniferous pellet is larger.Domestic main Pan Ganghe Chengde pelletizing plant produces vanadium-titanium pellet, but what produce is mainly common acid titaniferous pellet, pellet TiO
2content is at 8-15%, SiO
2content is substantially more than 4.6%.The SiO of this titaniferous pellet
2the shortcomings such as content is higher, and metallurgical performance is poor, as low in reduction degree, and melt-dropping property is bad.SiO
2content is high, can increase the quantity of slag of blast furnace, and reduction degree is low, is unfavorable for the carrying out of blast furnace indirect reduction, the bad stable smooth operation that can affect blast furnace of melt-dropping property.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of magnesia titaniferous pellet and preparation method thereof, has solved the low and SiO of titaniferous metallurgical properties
2content high-technology problem.
For solving the problems of the technologies described above, the invention provides a kind of preparation method of magnesia titaniferous pellet, comprise the steps:
The magnesia powder of 1.3-3.5 weight part is allocated in the ilmenite concentrate powder of 95.9-98.2 weight part, and then with addition of the wilkinite of 0.5-0.6 weight part as batch mixing;
With mixing equipment, described batch mixing is mixed;
Add moisture, the described batch mixing mixing is carried out to pelletizing in balling disc, obtain green-ball;
After described green-ball successively drying, preheating, roasting and process of cooling, obtain magnesia titaniferous pellet.
Further, in described magnesia powder MgO content at the more than 80% of total amount.
Further, the content that in described magnesia powder, grade is less than 44 μ m reaches the more than 80% of total amount.
Further, described dry comprising:
Temperature is elevated to 400 ℃ gradually from 230 ℃, and temperature rise rate is 17 ℃ of per minutes, and be 10 minutes total time of drying.
Further, described warm comprises:
When temperature is 500 ℃, preheating is 2 minutes, is warming up to 600 ℃ of preheatings 2 minutes again, then is warming up to 700 ℃ of preheatings 2 minutes, and then be warming up to 800 ℃ of preheatings 2 minutes, then be warming up to 900 ℃ of preheatings 3 minutes, is finally warming up to 1000 ℃ of preheatings 4 minutes.
Further, described roasting method comprises:
Temperature is 1100 ℃ of roastings 2 minutes, is warming up to 1200 ℃ of roastings 3 minutes, and then is warming up to 1250 ℃ of roastings 3 minutes, finally 1280-1300 ℃ of roasting 10 minutes.
The preparation method of magnesia titaniferous pellet provided by the invention, ilmenite concentrate powder is with addition of magnesia powder, the reduction degree that can effectively improve titaniferous pellet is low, reduction swellability rate and low temperature reduction degradation index are high, the problem that melt-dropping property is poor, simultaneous oxidation magnesium powder is finely ground to the following grade of 44 μ m and reaches more than 80%, can reduce the bentonite ore ratio of titanium fine powder pelletizing process, thereby reduces the SiO of titaniferous pellet
2content, obtains low silicon, the blast furnace protecting iron charge of good metallurgical performance.The SiO of the magnesia titaniferous pellet that present method obtains
2content is below 3%, and MgO content is at 1.8-3.5%, TiO
2content is at 10-20%, and reduction degree is more than 75%.
Accompanying drawing explanation
Preparation method's process step figure of the magnesia titaniferous pellet that Fig. 1 provides for the embodiment of the present invention.
Embodiment
Referring to Fig. 1, the preparation method of a kind of magnesia titaniferous pellet that the embodiment of the present invention provides, comprises the steps:
The magnesia powder of 1.3-3.5kg is allocated in the ilmenite concentrate powder of 95.9-98.2kg, and then with addition of the wilkinite of 0.5-0.6kg as batch mixing, wherein, titaniferous fine ore is with addition of magnesia powder, the reduction degree that can effectively improve titaniferous pellet is low, reduction swellability rate and low temperature reduction degradation index are high, the problem that melt-dropping property is poor;
With mixing equipment all batch mixing mix;
Add moisture, the batch mixing mixing is carried out in balling disc to pelletizing, obtain green-ball;
After green-ball successively drying, preheating, roasting and process of cooling, obtain magnesia titaniferous pellet.
embodiment 1:
In embodiments of the present invention, also provide a kind of concrete preparation method of magnesia titaniferous pellet, comprise the steps:
Step 101: the magnesia powder of 1.3kg is allocated in the ilmenite concentrate powder of 98.2kg, and then with addition of the wilkinite of 0.5kg as batch mixing, wherein, in magnesia powder, MgO content is 90%, in magnesia powder, to be less than the content of 44 μ m be 83% of total amount to grade.Magnesia powder is finely ground to the following grade of 44 μ m and reaches 80%, can reduce the bentonite ore ratio of titanium fine powder pelletizing process, thereby reduces the SiO of titaniferous pellet
2content, obtains low silicon, the blast furnace protecting iron charge of good metallurgical performance;
Step 102: batch mixing is mixed with mixing equipment;
Step 103: add moisture, make moisture account for batch mixing total amount 8.0%, the batch mixing mixing is carried out in balling disc to pelletizing, obtain green-ball, wherein, the mean diameter of green-ball is 13mm;
Step 104: this green-ball is dried, and drying process temperature is 230 ℃ and is elevated to gradually 400 ℃, 17 ℃ of temperature rise rate control per minutes, be 10 minutes total time of drying.
Step 105: then this green-ball is carried out to preheating, at 500 ℃, preheating is 2 minutes, then be warming up to 600 ℃ of preheatings 2 minutes, and then be warming up to 700 ℃ of preheatings 2 minutes, and then be warming up to 800 ℃ of preheatings 2 minutes, and then be warming up to 900 ℃ of preheatings 3 minutes, and being finally warming up to 1000 ℃ of preheatings 4 minutes, be 15 minutes total warm up time.
Step 106: after preheating,, to this green-ball roasting, roasting process is 1100 ℃ of roastings 2 minutes, is then warming up to 1200 ℃ of roastings 3 minutes, and then be warming up to 1250 ℃ of roastings 3 minutes, finally 1280 ℃ of roastings 10 minutes, total roasting time is 18 minutes;
Step 107: the pelletizing after roasting is cooled to below 150 ℃, obtains magnesia titaniferous pellet.
Magnesia titaniferous pellet prepared by the embodiment of the present invention, SiO
2content is that 2.89%, MgO content is 1.8%, and reduction degree is 75.1%.
embodiment 2:
In embodiments of the present invention, also provide a kind of concrete preparation method of magnesia titaniferous pellet, comprise the steps:
Step 201: the magnesia powder of 3.5kg is allocated in the ilmenite concentrate powder of 95.9kg, and then with addition of the wilkinite of 0.6kg as batch mixing, wherein, in magnesia powder, MgO content is 85% of total content, and the content that in magnesia powder, grade is less than 44 μ m reaches 92% of total content;
Step 202: batch mixing is mixed with mixing equipment;
Step 203: add moisture, make moisture account for batch mixing total amount 8.5%, the batch mixing mixing is carried out in balling disc to pelletizing, obtain green-ball, wherein, the mean diameter of green-ball is 12.5mm;
Step 204: this green-ball is dried, and drying process temperature is 230 ℃ and is elevated to gradually 400 ℃, 17 ℃ of temperature rise rate control per minutes, be 10 minutes total time of drying.
Step 205: then this green-ball is carried out to preheating, at 500 ℃, preheating is 2 minutes, then be warming up to 600 ℃ of preheatings 2 minutes, and then be warming up to 700 ℃ of preheatings 2 minutes, and then be warming up to 800 ℃ of preheatings 2 minutes, and then be warming up to 900 ℃ of preheatings 3 minutes, and being finally warming up to 1000 ℃ of preheatings 4 minutes, be 15 minutes total warm up time.
Step 206: after preheating,, to this green-ball roasting, roasting process is 1100 ℃ of roastings 2 minutes, is then warming up to 1200 ℃ of roastings 3 minutes, and then be warming up to 1250 ℃ of roastings 3 minutes, finally 1300 ℃ of roastings 10 minutes, total roasting time is 18 minutes;
Step 207: the pelletizing after roasting is cooled to below 150 ℃, obtains magnesia titaniferous pellet.
Magnesia titaniferous pellet prepared by the embodiment of the present invention, SiO
2content at 2.95%, MgO content 3.5%, reduction degree 77.5%.
Table 1 is the metallurgical performance comparison of the magnesia titaniferous pellet that do not obtain with addition of the common titaniferous pellet of magnesia powder and the embodiment of the present invention 1 and 2 methods.The SiO of common titaniferous pellet
2content is 3.91%, and reduction swellability rate is high, reaches 26.4%, and reduction degree is low, is 65.5%.And the SiO of the magnesia titaniferous pellet that in present method, example 1 obtains
2content is that 2.89%, MgO content is 1.80%, and reduction swellability rate is 19.43%, and reduction degree is 75.1%.The magnesia titaniferous pellet SiO that present method example 2 obtains
2content is 2.95%, and reduction swellability rate is 15.32%, and reduction degree reaches 77.5%.
The magnesia titaniferous metallurgical properties comparison that the common titaniferous pelletizing of table 1 and present method obtain
Table 2 is that ilmenite concentrate powder adds magnesia powder and the green-ball index situation during with addition of fine grinding magnesia powder.From table, while being unworthy of magnesia powder, when titaniferous fine ore need to be joined 2.0% wilkinite, green-ball falls index and reaches 5.1 times/0.5m, and during with addition of 1.3-3.5% fine grinding magnesia powder, bentonite ore ratio 0.5% and 0.6% time, green-ball index has reached and 2.0% bentonitic green-ball index level.Illustrate that titaniferous fine ore can reduce bentonite ore ratio, pellet SiO after fine grinding magnesia powder
2content is down to below 2.95% by 3.91%.
The comparison of table 2 green-ball index
Magnesia titaniferous pellet that the embodiment of the present invention provides and preparation method thereof, ilmenite concentrate powder is with addition of magnesia powder, the reduction degree that can effectively improve titaniferous pellet is low, reduction swellability rate and low temperature reduction degradation index are high, the problem that melt-dropping property is poor, simultaneous oxidation magnesium powder is finely ground to the following grade of 44 μ m and reaches more than 80%, can reduce the bentonite ore ratio of titanium fine powder pelletizing process, thereby reduces the SiO of titaniferous pellet
2content, obtains low silicon, the blast furnace protecting iron charge of good metallurgical performance.The SiO of the magnesia titaniferous pellet that present method obtains
2content is below 3%, and MgO content is at 1.8-3.5%, TiO
2at 10-20%, reduction degree is more than 75%.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. a preparation method for magnesia titaniferous pellet, is characterized in that, comprises the steps:
The magnesia powder of 1.3-3.5 weight part is allocated in the ilmenite concentrate powder of 95.9-98.2 weight part, and then with addition of the wilkinite of 0.5-0.6 weight part as batch mixing;
With mixing equipment, described batch mixing is mixed;
Add moisture, the described batch mixing mixing is carried out to pelletizing in balling disc, obtain green-ball;
After described green-ball successively drying, preheating, roasting and process of cooling, obtain magnesia titaniferous pellet.
2. preparation method according to claim 1, is characterized in that, in ilmenite concentrate powder with addition of MgO content at more than 80% magnesia powder.
3. preparation method according to claim 2, is characterized in that, the content that in described magnesia powder, grade is less than 44 μ m reaches more than 80%.
4. preparation method according to claim 1, is characterized in that, described dry comprising:
Temperature is elevated to 400 ℃ gradually from 230 ℃, and temperature rise rate is 17 ℃ of per minutes, and be 10 minutes total time of drying.
5. preparation method according to claim 4, is characterized in that, described warm comprises:
When temperature is 500 ℃, preheating is 2 minutes, is warming up to 600 ℃ of preheatings 2 minutes again, then is warming up to 700 ℃ of preheatings 2 minutes, and then be warming up to 800 ℃ of preheatings 2 minutes, then be warming up to 900 ℃ of preheatings 3 minutes, is finally warming up to 1000 ℃ of preheatings 4 minutes.
6. preparation method according to claim 5, is characterized in that, described roasting method comprises:
Temperature is 1100 ℃ of roastings 2 minutes, is warming up to 1200 ℃ of roastings 3 minutes, and then is warming up to 1250 ℃ of roastings 3 minutes, finally 1280-1300 ℃ of roasting 10 minutes.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104372127A (en) * | 2014-11-11 | 2015-02-25 | 首钢总公司 | Method for improving furnace maintenance efficiency of blast furnace |
| CN104946885A (en) * | 2015-06-18 | 2015-09-30 | 首钢京唐钢铁联合有限责任公司 | Production method of titanium-contained pellet |
| CN107841620A (en) * | 2017-10-25 | 2018-03-27 | 河钢股份有限公司 | A kind of magnesia iron ore pellets preparation method of low titanium |
| CN110106351A (en) * | 2019-04-19 | 2019-08-09 | 承德信通首承矿业有限责任公司 | A kind of production method of magnesium-rich pellet nodulizing |
| CN114410960A (en) * | 2021-12-17 | 2022-04-29 | 萍乡市众邦冶金有限公司 | Pelletizing production process for steel smelting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104372127A (en) * | 2014-11-11 | 2015-02-25 | 首钢总公司 | Method for improving furnace maintenance efficiency of blast furnace |
| CN104946885A (en) * | 2015-06-18 | 2015-09-30 | 首钢京唐钢铁联合有限责任公司 | Production method of titanium-contained pellet |
| CN104946885B (en) * | 2015-06-18 | 2017-10-10 | 首钢京唐钢铁联合有限责任公司 | A kind of production method of titaniferous pelletizing |
| CN107841620A (en) * | 2017-10-25 | 2018-03-27 | 河钢股份有限公司 | A kind of magnesia iron ore pellets preparation method of low titanium |
| CN110106351A (en) * | 2019-04-19 | 2019-08-09 | 承德信通首承矿业有限责任公司 | A kind of production method of magnesium-rich pellet nodulizing |
| CN110106351B (en) * | 2019-04-19 | 2021-10-22 | 承德信通首承科技有限责任公司 | Production method of high-magnesium pellet ore |
| CN114410960A (en) * | 2021-12-17 | 2022-04-29 | 萍乡市众邦冶金有限公司 | Pelletizing production process for steel smelting |
| CN114410960B (en) * | 2021-12-17 | 2023-12-12 | 萍乡市众邦冶金有限公司 | Pellet production process for steel smelting |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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