CN103924069A - Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials - Google Patents
Method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials Download PDFInfo
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- CN103924069A CN103924069A CN201410150434.XA CN201410150434A CN103924069A CN 103924069 A CN103924069 A CN 103924069A CN 201410150434 A CN201410150434 A CN 201410150434A CN 103924069 A CN103924069 A CN 103924069A
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Abstract
The invention relates to the field of oxidized pellets, in particular to a method for preparing oxidized pellets by utilizing iron-containing royalex sea sand concentrates as raw materials. The invention aims at providing an oxidized pellet preparation method capable of economically and efficiently producing high-quality oxidized pellets. The method for preparing the oxidized pellets by utilizing the iron-containing royalex sea sand concentrates as the raw materials comprises the following steps: a, selecting the sea sand concentrates, performing magnetic separation for mineral separation, mixing the sea sand concentrates with a bentonite ingredient, and adding water; b, pelletizing and roasting a mixture of the sea sand concentrates and the bentonite ingredient; c, obtaining the oxidized pellets. The compressive strength of a finished pellet is greater than or equal to 2500N per piece, and the reduction expansion index of the finished pellet is less than 20%. Since the iron-containing royalex sea sand concentrates are extensive in source, rich in inventory, easily available, and low in cost, the obtained pellets are high in strength and good in metallurgy property. The method is especially applicable to preparing high-quality oxidized pellets by use of the iron-containing royalex sea sand concentrates.
Description
Technical field
The present invention relates to the oxidisability pellet field of ferrous metallurgy, especially a kind of method of preparing oxide pellet taking iron content Indonesia sea sand concentrate as raw material.
Background technology
Oxidisability pellet is as the important component part of Bf Burden, and the quality of its performance directly affects blast-furnace smelting so that whole Iron and Steel Production.Although China's pellet is produced and is had a great development, but still exists many problems, is mainly reflected in the following aspects: (1) grade is low; (2) SiO
2high; (3) ultimate compression strength is poor; (4) problem such as bentonite ore ratio is higher.Trace it to its cause and be mainly: China's iron ore grade is low, and foreign matter content is high, cause concentrate character complexity, balling property is poor.Therefore, pellet formation towards maximize and automation development in, on raw material, select higher-grade, fine granularity, low SiO
2fine ore, manage to reduce bentonite consumption, study new highly effective binder, set up raw material drying equipment, adopt profit mill and high pressure roller mill technique pre-treated mixed material, adopt rational balling equipment and technique, adopting roasting apparatus and the cooling apparatus technique etc. of high-level efficiency, less energy-consumption, maximization is the development trend of pellet formation.Wherein the quality of iron ore concentrate is one of the key factor that determines pellet quality, and the large raw material of the cheap reserves of How to choose reasonable price becomes and improves pellet quality and make enterprise keep for a long time the emphasis of competitive power.Therefore, there is no at present not only economy but also the efficiently method of production high-quality oxidisability pellet.
Summary of the invention
Technical problem to be solved by this invention is to provide one, and to utilize iron content Indonesia sea sand concentrate be raw material, thereby can be comparatively economical and the oxide pellet preparation method of production high-quality oxidisability pellet efficiently.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material, comprises the following steps:
A, choose extra large sand concentrate and described extra large sand concentrate is carried out to magnetic separation ore dressing, mix and add water with wilkinite batching choosing the extra large sand concentrate obtaining, obtain the mixture that extra large sand concentrate and wilkinite are prepared burden;
Thereby b, the mixture of the extra large sand concentrate obtaining and wilkinite batching is carried out to pelletizing obtain green-ball, described green-ball is carried out to roasting;
C, prepare oxidisability pelletizing.
Further, the main composition of extra large sand concentrate obtaining through magnetic separation ore dressing in step a is configured to TFe60%～61%, SiO
25%, Al
2o
33.6%, CaO1%, TiO
29.95%, MgO3.5%.
Further, raw material is iron content Indonesia sea sand concentrate, and in described iron content Indonesia sea sand concentrate, to be less than the mass percent of the iron content Indonesia sea sand concentrate of 0.074mm be 40%～90% to granularity.
Further, described iron content Indonesia sea sand concentrate grinds little by the grinding of high pressure roller mill by the granularity of iron content Indonesia sea sand concentrate.
Further, in step b, the wilkinite of green-ball batching mass ratio range is 1.8%～2.5%, and the mass range of green-ball moisture is 7.0～7.5%.
Further, described green-ball is carried out to preheating before the calcination steps in step b, 700 DEG C～1000 DEG C of the preheating temperatures of described preheating, warm up time 8～15min.
Further, the maturing temperature scope of roasting in step b is 1200 DEG C～1250 DEG C, and roasting time is 10～20min.
The invention has the beneficial effects as follows: the present invention is based on iron content Indonesia sea sand concentrate, described iron content Indonesia sea sand concentrate is mixed and added water with wilkinite batching, and successively described mixture is carried out to pelletizing and roasting, can obtain the oxidisability pelletizing of high-quality.A finished pellet ultimate compression strength >=2500N/ obtaining, reduction swellability index is below 20%.Due to iron content Indonesia sea sand concentrate wide material sources, reserves are abundant, are easy to obtain, and cost is low, and meanwhile, the intensity of the pelletizing obtaining is high, and metallurgical performance is good.The present invention is particularly useful for utilizing iron content Indonesia sea sand concentrate to prepare the oxidisability pelletizing of high-quality.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
A kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material, comprise the following steps: a, choose extra large sand concentrate and described extra large sand concentrate is carried out to magnetic separation ore dressing, mix and add water with wilkinite batching choosing the extra large sand concentrate obtaining, obtaining the mixture of extra large sand concentrate and wilkinite batching; Thereby b, the mixture of the extra large sand concentrate obtaining and wilkinite batching is carried out to pelletizing obtain green-ball, described green-ball is carried out to roasting; C, prepare oxidisability pelletizing.
Wherein, described extra large sand concentrate is iron content Indonesia sea sand concentrate, described iron content Indonesia sea sand concentrate is that Indonesia's one band is found a kind of extra large placer original name iron sand, it is the product that the underflow that goes out of volcanic eruption forms after by seawater scouring, between ferrous grade 42% to 51%, the extra large placer resource reserve of the Indonesia of having verified is more than 200,000,000 tons, cheap.This new raw material cost is low, and obtains easily, and this provides guarantee for reducing oxidisability pellet formation cost.Simultaneously, what described wilkinite adopted is taking montmorillonite as main moisture clay pit, in producing, practice is also easy to obtain, wherein, the chemical composition of described montmorillonite is: (Na, Ca) 0.33 (Al, Mg, Fe) 2[(Si, Al) 4O10] (OH) 2nH2O (montmorillonite); Analytical value: Al2O3:16.54%, FeO:0.26%, SiO2:50.95%, Fe2O3:1.36%, MgO:4.65%, CaO:2.26%, K2O:0.47%, H2O:23.29%.Wilkinite is carried out modification by bentonitic basic preparation method, make its performance must be with improvement, concrete modified technique has high-temperature roasting method, acid activation method, sodium modification method and microwave method etc., and conventional sodium modification method technique is: high mixed (agent of original soil+sodium) → natural placement → test performance of original soil pulverizing → sodium).Mix by above-mentioned iron content Indonesia sea sand concentrate is passed through with wilkinite batching, add water, pelletizing and roasting, can obtain the oxidisability pelletizing of high-quality.
For iron content Indonesia sea sand concentrate, after magnetic separation ore dressing, the main composition of the preferred extra large sand concentrate obtaining is configured to TFe60%～61%, SiO
25%, Al
2o
33.6%, CaO1%, TiO
29.95%, MgO3.5%.In the production of practice, the product quality that the extra large sand concentrate of above-mentioned main component obtains is for best, and not only finished pellet ultimate compression strength is greatly enhanced, and reduction swellability index also has reduction at the same time.
In order to make the mixed effect of extra large sand concentrate and wilkinite batching better, after a large amount of experiments, while being iron content Indonesia sea sand concentrate for raw material, in first-selected described iron content Indonesia sea sand concentrate, to be less than the mass percent of the iron content Indonesia sea sand concentrate of 0.074mm be 40%～90% to granularity.When the mass percent that is less than the iron content Indonesia sea sand concentrate of 0.074mm in granularity is 40%～90%, iron content Indonesia sea sand concentrate reaches best with the mixed effect that wilkinite is prepared burden, and this can directly improve the quality of oxidisability pelletizing.Meanwhile, in practice, general selection is passed through the grinding of high pressure roller mill by little the granularity mill of iron content Indonesia sea sand concentrate, and such producer formula weight is large and can ensure product quality.
For the wilkinite batching mass ratio of green-ball, preferred scope is 1.8%～2.5%, and the mass range of green-ball moisture is 7.0～7.5%.Aforementioned proportion scope is also that the practice based on a large amount of obtains, and can ensure the quality of the oxidisability pelletizing obtaining.
After green-ball finishes, if it is carried out to preheating, can further improve the quality of oxidisability pelletizing, concrete operating method is: 700 DEG C～1000 DEG C of the preheating temperatures of preheating, warm up time 8～15min.
Simultaneously, in the roasting of carrying out after preheating, thereby also needing temperature to control the product that better obtains high-quality, general operation is: maturing temperature scope is 1200 DEG C～1250 DEG C, and roasting time is 10～20min.
It is raw material that the present invention chooses the iron content Indonesia sea sand concentrate that is comparatively easy to obtain, thus through with wilkinite batching economical and efficient make oxidisability pelletizing, not only greatly reduce production cost, also allow the oxidisability pelletizing quality obtaining be improved.
Embodiment
Embodiment 1. is controlled at the mass percent that is less than 0.074mm for being greater than 40% by extra large sand granularity of concentrate, wilkinite ratio 2.5%, and green-ball moisture controlled is 7.5%.The shatter strength of green pellet 4.1N/ of preparation, 800 DEG C of preheating temperatures, warm up time 10min, 1250 DEG C of maturing temperatures, roasting time 20min.A finished pellet ultimate compression strength 2526N/ finally obtaining, reduction swellability index 18.8%.
Embodiment 2. is controlled at the mass percent that is less than 0.074mm for being greater than 50% by extra large sand granularity of concentrate, wilkinite ratio 2.2%, green-ball moisture controlled is 7.4%, the shatter strength of green pellet 4.3N/ of preparation, 850 DEG C of preheating temperatures, warm up time 15min, 1220 DEG C of maturing temperatures, roasting time 14min.A finished pellet ultimate compression strength 2630N/ finally obtaining, reduction swellability index 17.2%.
Embodiment 3. is controlled at the mass percent that is less than 0.074mm for being greater than 60% by extra large sand granularity of concentrate, wilkinite ratio 2.2%, green-ball moisture controlled is 7.3%, the shatter strength of green pellet 4.5N/ of preparation, 850 DEG C of preheating temperatures, warm up time 12min, 1240 DEG C of maturing temperatures, roasting time 17min.A finished pellet ultimate compression strength 2580N/ finally obtaining, reduction swellability index 14.5%.
Embodiment 4. is controlled at the mass percent that is less than 0.074mm for being greater than 70% by extra large sand granularity of concentrate, wilkinite ratio 2.0%, green-ball moisture controlled is 7.1%, the shatter strength of green pellet 4.3N/ of preparation, 850 DEG C of preheating temperatures, warm up time 10min, 1230 DEG C of maturing temperatures, roasting time 19min.A finished pellet ultimate compression strength 2700N/ finally obtaining, reduction swellability index 16.4%.
Embodiment 5. is controlled at the mass percent that is less than 0.074mm for being greater than 80% by extra large sand granularity of concentrate, wilkinite ratio 1.9%, and green-ball moisture controlled is 7.1%, the shatter strength of green pellet 5N/ of preparation, 900 DEG C of preheating temperatures, warm up time 14min, 1200 DEG C of maturing temperatures, roasting time 16min.A finished pellet ultimate compression strength 2850N/ finally obtaining, reduction swellability index 12.4%.
Implement 6. extra large sand granularity of concentrate is controlled to the mass percent that is less than 0.074mm for being greater than 85%, wilkinite ratio 1.85%, green-ball moisture controlled is 7.15%, the shatter strength of green pellet 6.5N/ of preparation, 950 DEG C of preheating temperatures, warm up time 13min, 1200 DEG C of maturing temperatures, roasting time 15min.A finished pellet ultimate compression strength 2788N/ finally obtaining, reduction swellability index 13.9%.
Embodiment 7. is controlled at the mass percent that is less than 0.074mm for being greater than 90% by extra large sand granularity of concentrate, wilkinite ratio 1.8%, green-ball moisture controlled is 7.28%, the shatter strength of green pellet 7.3N/ of preparation, 900 DEG C of preheating temperatures, warm up time 8min, 1210 DEG C of maturing temperatures, roasting time 18min.A finished pellet ultimate compression strength 2910N/ finally obtaining, reduction swellability index 14.2%.
Embodiment 8. is controlled at the mass percent that is less than 0.074mm for being greater than 75% by extra large sand granularity of concentrate, wilkinite ratio 19%, green-ball moisture controlled is 7.43%, the shatter strength of green pellet 4.67N/ of preparation, 950 DEG C of preheating temperatures, warm up time 12min, 1210 DEG C of maturing temperatures, roasting time 14min.A finished pellet ultimate compression strength 2520N/ finally obtaining, reduction swellability index 9.9%.
Embodiment 9. is controlled at the mass percent that is less than 0.074mm for being greater than 65% by extra large sand granularity of concentrate, wilkinite ratio 19%, green-ball moisture controlled is 7.34%, the shatter strength of green pellet 4.23N/ of preparation, 850 DEG C of preheating temperatures, warm up time 10min, 1235 DEG C of maturing temperatures, roasting time 12min.A finished pellet ultimate compression strength 2500N/ finally obtaining, reduction swellability index 11.6%.
Embodiment 10. is controlled at the mass percent that is less than 0.074mm for being greater than 55% by extra large sand granularity of concentrate, wilkinite ratio 2.35%, green-ball moisture controlled is 7.45%, the shatter strength of green pellet 4.12N/ of preparation, 850 DEG C of preheating temperatures, warm up time 11min, 1220 DEG C of maturing temperatures, roasting time 10min.A finished pellet ultimate compression strength 2550N/ finally obtaining, reduction swellability index 10.8%.
Embodiment 11. is controlled at the mass percent that is less than 0.074mm for being greater than 45% by extra large sand granularity of concentrate, wilkinite ratio 2.45%, green-ball moisture controlled is 7.5%, the shatter strength of green pellet 4.24N/ of preparation, 900 DEG C of preheating temperatures, warm up time 14min, 1240 DEG C of maturing temperatures, roasting time 15min.A finished pellet ultimate compression strength 2620N/ finally obtaining, reduction swellability index 13.3%.
Claims (7)
1. a method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material, is characterized in that, comprises the following steps:
A, choose extra large sand concentrate and described extra large sand concentrate is carried out to magnetic separation ore dressing, mix and add water with wilkinite batching choosing the extra large sand concentrate obtaining, obtain the mixture that extra large sand concentrate and wilkinite are prepared burden;
Thereby b, the mixture of the extra large sand concentrate obtaining and wilkinite batching is carried out to pelletizing obtain green-ball, described green-ball is carried out to roasting;
C, prepare oxidisability pelletizing.
2. a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material as claimed in claim 1, is characterized in that: the main composition of extra large sand concentrate obtaining through magnetic separation ore dressing in step a is configured to TFe60%～61%, SiO
25%, Al
2o
33.6%, CaO1%, TiO
29.95%, MgO3.5%.
3. a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material as claimed in claim 1 or 2, it is characterized in that: raw material is iron content Indonesia sea sand concentrate, in described iron content Indonesia sea sand concentrate, to be less than the mass percent of the iron content Indonesia sea sand concentrate of 0.074mm be 40%～90% to granularity.
4. a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material as claimed in claim 3, is characterized in that: described iron content Indonesia sea sand concentrate grinds little by the grinding of high pressure roller mill by the granularity of iron content Indonesia sea sand concentrate.
5. a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material as claimed in claim 1 or 2, it is characterized in that: in step b, the wilkinite of green-ball batching mass ratio range is 1.8%～2.5%, and the mass range of green-ball moisture is 7.0～7.5%.
6. a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material as claimed in claim 1 or 2, it is characterized in that: before the calcination steps in step b, described green-ball is carried out to preheating, 700 DEG C～1000 DEG C of the preheating temperatures of described preheating, warm up time 8～15min.
7. a kind of method of preparing oxidisability pelletizing taking iron content Indonesia sea sand concentrate as raw material as claimed in claim 6, is characterized in that: the maturing temperature scope of roasting in step b is 1200 DEG C～1250 DEG C, and roasting time is 10～20min.
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Cited By (7)
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| CN104388612A (en) * | 2014-10-23 | 2015-03-04 | 大冶特殊钢股份有限公司 | Furnace protecting method for blast furnace with low-cost titanium ore |
| CN104458795A (en) * | 2014-12-01 | 2015-03-25 | 武钢集团昆明钢铁股份有限公司 | Method for rapidly and accurately measuring cracking temperature of green pellets |
| CN104593590A (en) * | 2015-01-04 | 2015-05-06 | 张�诚 | Pretreatment method of marine placer |
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| CN110512074A (en) * | 2019-09-29 | 2019-11-29 | 东北大学 | A kind of method that high mixture ratio New Zealand sea sand raw ore prepares acid pellet |
| CN114196823A (en) * | 2021-11-23 | 2022-03-18 | 东北大学 | High-proportion sea sand type vanadium titano-magnetite multi-shell pellet and preparation method thereof |
| CN114807598A (en) * | 2022-04-12 | 2022-07-29 | 黑龙江建龙钢铁有限公司 | Method for preparing vanadium-titanium pellets by using sea sand coarse powder |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104458795A (en) * | 2014-12-01 | 2015-03-25 | 武钢集团昆明钢铁股份有限公司 | Method for rapidly and accurately measuring cracking temperature of green pellets |
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| CN110512074A (en) * | 2019-09-29 | 2019-11-29 | 东北大学 | A kind of method that high mixture ratio New Zealand sea sand raw ore prepares acid pellet |
| CN114196823A (en) * | 2021-11-23 | 2022-03-18 | 东北大学 | High-proportion sea sand type vanadium titano-magnetite multi-shell pellet and preparation method thereof |
| CN114196823B (en) * | 2021-11-23 | 2022-12-13 | 东北大学 | High-proportion sea sand type vanadium titano-magnetite multi-shell pellet and preparation method thereof |
| CN114807598A (en) * | 2022-04-12 | 2022-07-29 | 黑龙江建龙钢铁有限公司 | Method for preparing vanadium-titanium pellets by using sea sand coarse powder |
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