CN104263917A - Raw material and method for producing magnesium pellets by using belt type machine - Google Patents
Raw material and method for producing magnesium pellets by using belt type machine Download PDFInfo
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- CN104263917A CN104263917A CN201410481824.5A CN201410481824A CN104263917A CN 104263917 A CN104263917 A CN 104263917A CN 201410481824 A CN201410481824 A CN 201410481824A CN 104263917 A CN104263917 A CN 104263917A
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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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Abstract
The invention discloses a raw material and method for producing magnesium pellets by using a belt type machine. The method comprises the steps of sufficiently mixing an iron-containing raw material, serpentine and bentonite in an intensive mixer to obtain a mixture, wherein the serpentine accounts for 1.0-2.5% of the mixture, and the bentonite accounts for 2% of the mixture; pelletizing the mixture in a pelletizing pan to obtain green pellets; drying the green pellets on a forced air drying zone and an induced-draft drying zone of the belt type machine, preheating the green pellets on a preheating zone, roasting the green pellets on a roasting zone, recrystallizing the green pellets on a soaking zone, and cooling the green pellets on a first cooling zone and a second cooling zone to finally obtain the magnesium oxidized pellets. According to the method, the serpentine is used as a magnesium additive for producing the magnesium pellets, and the metallurgical performances of the pellets with special baiyenebo iron concentrate ratio can be remarkably improved by virtue of a technical measure that the serpentine is added.
Description
Technical field
The invention belongs to a kind of iron-smelting raw material pellet agglomeration technology, particularly relate to a kind of belt machine and produce magnesia pellet raw material and magnesia pellet production method thereof.
Background technology
Can blast fumance carry out with the performance of slag closely related smoothly, and the performance of slag is by the impact of several factors, and topmost in these influence factors is exactly slag composition.Domestic and international metallargist is found by large quantifier elimination, suitably improves slag content of MgO to raising slag fluidity and stability, improves slag integrated metallurgical performance, reduces silicon content in pig iron and plays good effect.Research in the past once did systematic study to the optimization of MgO in high burden structure, think fit and improve content of MgO in slag, slag fluidity can be improved, improve slag desulfurization capacity and row's alkali content etc., content of MgO suitable in slag should control at 8-10%, adopt low MgO agglomerate both can meet the demand of blast furnace slag to content of MgO with addition of the burden structure containing MgO pellet simultaneously, the metallurgical performance of comprehensive furnace charge can be improved again, to the excellent blast furnace burden of production performance, improve permeability of stock column, optimize blast furnace slag metallurgical performance etc. and there is important references be worth.
The metallurgical performance of contrast Baogang agglomerate, pellet can be found out, the reflowing temperature of Baogang's agglomerate is higher than the reflowing temperature of pellet many, make comprehensive furnace charge cohesive zone temperature range thicker, but along with agglomerate reduces content of MgO and pellet raising content of MgO, agglomerate reflowing temperature reduces, pellet reflowing temperature improves, thus the molten temperature region of agglomerate and pellet reaches unanimity, and makes whole furnace charge cohesive zone temperature range thinning.Ge great scientific research institutions had extensively carried out the research work of magnesia pellet exploitation both at home and abroad in recent years, and result of study shows: the metallurgical performance of acidic pellet ore is improved with content of MgO increase in pelletizing comprehensively.After Baogang's pellet improves MgO, reduction swellability rate is improved, and soft heat interval narrows, and reflowing temperature raises, and maximum differential pressure obviously reduces, and will be conducive to improving Baogang's pellet quality and BF Technology in Bao Steel index so each pelletizing process of Baogang develops magnesia pelletizing.
Application number 200910248480.2, the patent document of applying date 2009.12.17 discloses a kind of chain grate machine rotary kiln and produces magnesia pelletizing process.The correlative study of magnesia pelletizing is not also carried out at present for belt machine technique.
Summary of the invention
Technical problem solved by the invention is to provide a kind of belt machine and produces magnesia pellet raw material, utilizes the technical measures with addition of serpentine obviously can improve the metallurgical performance of pellet.
Technical scheme is as follows:
A kind of belt machine produces magnesia pellet raw material, and according to weight percent meter, comprising: iron-bearing material, serpentine and wilkinite, serpentine is 1.0 ~ 2.5% of compound, and wilkinite is 2% of compound; Wherein,
Iron-bearing material comprises: the first iron ore concentrate 0 ~ 45%, second iron ore concentrate 55% ~ 100%; The chemical composition of the first iron ore concentrate, according to weight percent meter, comprising: TFe65.8 ~ 66.6%, FeO28.5 ~ 29.1%, MgO0.87 ~ 0.98%, CaO1.13 ~ 1.73%, Al
2o
3≤ 0.2%, SiO
21.05 ~ 2.04%, S0.54 ~ 0.83%, P≤0.05%, K
2o≤0.15%, Na
2o≤0.07%; In first iron ore concentrate, the per-cent that the concentrate of granularity≤0.074mm accounts for the first iron ore concentrate gross weight is at least 95%; The chemical composition of the second iron ore concentrate, according to weight percent meter, comprising: TFe64.91 ~ 65.83%, FeO27.9 ~ 29.0%, MgO0.89 ~ 1.13%, CaO1.06 ~ 1.94%, Al
2o
3≤ 0.8%, SiO
22.99 ~ 4.01%, S0.45 ~ 0.57%, P≤0.05%, K
2o≤0.08%, Na
2o≤0.08%; The per-cent that in second iron ore concentrate, the concentrate of granularity≤0.074mm accounts for the second iron ore concentrate gross weight is at least 90%;
Serpentine, according to weight percent meter, comprising: SiO
2>=38%, MgO>=38%, CaO≤1%, Ig≤13%, granularity≤0.074mm in serpentine.
Further: the first iron ore concentrate is the 40% of iron-bearing material, second iron ore is 60% of iron-bearing material, and the weight percent of serpentine in pelletizing compound is 1.5%, and the weight percent of wilkinite in pelletizing compound is 2%.
Technical problem solved by the invention is to provide a kind of belt machine and produces magnesia pellet method, utilizes the technical measures with addition of serpentine obviously can improve the metallurgical performance of pellet.
Technical scheme is as follows:
A kind of belt machine produces magnesia pellet method, comprising:
Iron-bearing material, serpentine and wilkinite be fully mixed to get compound in strong mixed machine, and serpentine weight percent is 1.0 ~ 2.5% of compound, and wilkinite weight percent is 2% of compound; The component of iron-bearing material comprises according to weight percent: the first iron ore 0 ~ 45%, second iron ore 55% ~ 100%; First iron ore concentrate, according to weight percent meter, comprising: TFe65.8 ~ 66.6%, FeO28.5 ~ 29.1%, MgO0.87 ~ 0.98%, CaO1.13 ~ 1.73%, Al
2o
3≤ 0.2%, SiO
21.05 ~ 2.04%, S0.54 ~ 0.83%, P≤0.05%, K
2o≤0.15%, Na
2o≤0.07%; In first iron ore concentrate, the per-cent that the concentrate of granularity≤0.074mm accounts for the first iron ore concentrate gross weight is at least 95%; Second iron ore concentrate comprises according to weight percent meter: TFe64.91 ~ 65.83%, FeO27.9 ~ 29.0%, MgO0.89 ~ 1.13%, CaO1.06 ~ 1.94%, Al
2o
3≤ 0.8%, SiO
22.99 ~ 4.01%, S0.45 ~ 0.57%, P≤0.05%, K
2o≤0.08%, Na
2o≤0.08%; The per-cent that in second iron ore concentrate, the concentrate of granularity≤0.074mm accounts for the second iron ore concentrate gross weight is at least 90%; Serpentine comprises according to weight percent meter: SiO2>=38%, MgO>=38%, CaO≤1%, Ig≤13%, granularity≤0.074mm in serpentine;
Compound pelletizing in balling disk (-sc) is obtained green-ball, green-ball is carried out drying via belt machine blasting drying period and down-draft drying zone, preheating section carries out preheating, firing section carries out roasting, soaking zone carries out pellet recrystallize, then cool cooling one section and two sections, finally obtain magnesia oxide pellet; The machine speed of belt machine at 1.4m/s ~ 1.6m/s, the condition of blasting drying period: temperature is 150 ~ 250 DEG C, the time is 4.69 ~ 5.36min, wind speed 2.2 ~ 2.5m/s; The condition of down-draft drying zone: temperature is 240 ~ 330 DEG C, the time is 3.75 ~ 4.29min, wind speed 1.1 ~ 1.4m/s; The condition of preheating: temperature is 600 ~ 900 DEG C, the time is 3.13 ~ 3.57min, wind speed 1.2 ~ 1.5m/s; The condition of roasting: temperature is 1240 ~ 1280 DEG C, the time is 6.25 ~ 7.14min, wind speed 1.2 ~ 1.5m/s; The condition of soaking: temperature is 800 ~ 1000 DEG C, the time is 3.13 ~ 3.57min, wind speed 1.2 ~ 1.5m/sa; Cool the condition of a section: temperature is 750 ~ 850 DEG C, the time is 9.38 ~ 10.71min, wind speed 1.5 ~ 1.7m/s; Cool the condition of two sections: temperature is 290 ~ 350 DEG C, the time is 3.75 ~ 4.29min, wind speed 1.9 ~ 2.2m/s.
Further: the first iron ore concentrate is the 40% of iron-bearing material, second iron ore is 60% of iron-bearing material, and the weight percent of serpentine in pelletizing compound is 1.5%, and the weight percent of wilkinite in pelletizing compound is 2%.
Further: magnesia pellet is according to weight percent meter, and content of MgO controls in 0.98% ~ 1.80% scope.
Compared with prior art, the technology of the present invention effect comprises:
1, the present invention is directed to band process and carry out magnesia pellet formation, utilize belt machine to produce magnesia pellet, the easier stability contorting of production process.
2, the present invention is serpentine at the magnesia additive that magnesia pellet formation is used, utilizes the technical measures with addition of serpentine obviously can improve the metallurgical performance of pellet under Bayan Obo particular iron concentrate proportioning.
Produce for belt machine, all can meet blast furnace demand with the magnesia pellet ultimate compression strength of this explained hereafter and barrate strength, the metallurgical performance such as its low-temperature reduction disintegration energy, reduction swellability performance, soft melting dropping performance, high-temperature reductibility all has and significantly improves simultaneously.The magnesia pellet simultaneously produced is than general acidic pellet, and metallurgical performance has and significantly improves.
3, the blast furnace burden that the present invention is excellent to production performance, improves permeability of stock column, and joint Jiao puies forward the aspects such as product and has important value.Annual more than 1,000,000 yuan of projected economic benefit.
Accompanying drawing explanation
Fig. 1 is the schema that in the present invention, belt machine produces magnesia pellet method.
Embodiment
The present invention be directed to magnesia pellet and production method thereof that a kind of belt machine of belt machine process exploitation produces, determine and be suitable for belt machine and produce with addition of the drying of the magnesia pellet of serpentine, preheating, roasting system.
Below with reference to the accompanying drawings and preferred embodiment, technical solution of the present invention is elaborated.
As shown in Figure 1, be the schema that in the present invention, belt machine produces magnesia pellet method.
Belt machine produces magnesia pellet method, comprises the following steps:
Step 1: first added weight per-cent is the serpentine of 1.0 ~ 2.5% and the wilkinite of 2% in iron-bearing material, is fully mixed to get compound in strong mixed machine; The component of iron-bearing material comprises according to weight percent: the first iron ore concentrate 0 ~ 45%, second iron ore concentrate 55% ~ 100%;
The chemical composition of the first iron ore concentrate, according to weight percent meter, comprising: TFe65.8 ~ 66.6%, FeO28.5 ~ 29.1%, MgO0.87 ~ 0.98%, CaO1.13 ~ 1.73%, Al
2o
3≤ 0.2%, SiO
21.05 ~ 2.04%, S0.54 ~ 0.83%, P≤0.05%, K
2o≤0.15%, Na
2o≤0.07%; In first iron ore concentrate, the per-cent that the concentrate of granularity≤0.074mm accounts for the first iron ore concentrate gross weight is at least 95%.
The chemical composition of the second iron ore concentrate, according to weight percent meter, comprising: TFe64.91 ~ 65.83%, FeO27.9 ~ 29.0%, MgO0.89 ~ 1.13%, CaO1.06 ~ 1.94%, Al
2o
3≤ 0.8%, SiO
22.99 ~ 4.01%, S0.45 ~ 0.57%, P≤0.05%, K
2o≤0.08%, Na
2o≤0.08%; The per-cent that in second iron ore concentrate, the concentrate of granularity≤0.074mm accounts for the second iron ore concentrate gross weight is at least 90%.
Serpentine, according to weight percent meter, comprising: SiO
2>=38%, MgO>=38%, CaO≤1%, Ig (Ig represents scaling loss percentage content)≤13%, granularity≤0.074mm in serpentine.
In the preferred embodiment of the present invention, the proportioning of the first iron ore concentrate, the second iron ore concentrate, serpentine, according to weight percent meter, first iron ore concentrate is 40% of iron-bearing material, second iron ore is 60% of iron-bearing material, the weight percent of serpentine in pelletizing compound is 1.5%, and the weight percent of wilkinite in pelletizing compound is 2%.
Step 2: described compound pelletizing in balling disk (-sc) is obtained green-ball, green-ball is carried out drying via belt machine blasting drying period and down-draft drying zone, preheating section carries out preheating, firing section carries out roasting, soaking zone carries out pellet recrystallize, then cool cooling one section and two sections, finally obtain magnesia oxide pellet.
The machine speed of belt machine at 1.4m/s ~ 1.6m/s, the condition of blasting drying period: temperature is 150 ~ 250 DEG C, the time is 4.69 ~ 5.36min, wind speed 2.2 ~ 2.5m/s; The condition of down-draft drying zone: temperature is 240 ~ 330 DEG C, the time is 3.75 ~ 4.29min, wind speed 1.1 ~ 1.4m/s; The condition of preheating: temperature is 600 ~ 900 DEG C, the time is 3.13 ~ 3.57min, wind speed 1.2 ~ 1.5m/s; The condition of roasting: temperature is 1240 ~ 1280 DEG C, the time is 6.25 ~ 7.14min, wind speed 1.2 ~ 1.5m/s; The condition of soaking: temperature is 800 ~ 1000 DEG C, the time is 3.13 ~ 3.57min, wind speed 1.2 ~ 1.5m/sa; Cool the condition of a section: temperature is 750 ~ 850 DEG C, the time is 9.38 ~ 10.71min, wind speed 1.5 ~ 1.7m/s; Cool the condition of two sections: temperature is 290 ~ 350 DEG C, the time is 3.75 ~ 4.29min, wind speed 1.9 ~ 2.2m/s.
The magnesia pellet that belt machine is produced, according to weight percent meter, its content of MgO controls in 0.98% ~ 1.80% scope.
Further illustrate the specific embodiment of the present invention below by three embodiments, but the specific embodiment of the present invention is not limited to following examples.
Utilize the magnesia pellet raw material configuration of belt machine production interpolation serpentine, composition and correlated performance respectively in Table in each embodiment.
Table 1 embodiment preparation of raw material scheme, %
| Test number | Compound | Serpentine |
| Embodiment 1 | 45% the first iron ore concentrate+55% second iron ore concentrate+2% wilkinites | - |
| Embodiment 2 | 45% the first iron ore concentrate+55% second iron ore concentrate+2% wilkinites | 1.5 |
| Embodiment 3 | 45% the first iron ore concentrate+55% second iron ore concentrate+2% wilkinites | 2.5 |
Table 2 embodiment green-ball and balling property
Table 3 embodiment finished pellet ore deposit chemical composition analysis, %
| Test number | TFe | FeO | SiO 2 | CaO | MgO | F | K 2O | Na 2O | R |
| PA | 63.69 | 1.97 | 4.30 | 1.29 | 0.98 | 0.05 | 0.134 | 0.083 | 0.30 |
| PB | 63.05 | 3.68 | 4.52 | 1.31 | 1.49 | 0.05 | 0.103 | 0.080 | 0.29 |
| PC | 62.62 | 2.60 | 4.81 | 1.36 | 1.81 | 0.05 | 0.104 | 0.073 | 0.28 |
* R represents finished ball nodulizing dual alkalinity
Table 4 embodiment pellet melt-dropping property detected result
* T
10characterize the beginning softening temperature of furnace charge; T
stemperature when pressure reduction skyrockets, characterize the beginning temperature of ore melting, the height of this temperature, represents the height of fusion zone position in stove; T
40-T
4represent the width between softened zone; T
d-T
srepresent between melting zone, say that the melting interval width of furnace charge represents the thickness of cohesive zone in blast furnace in a sense; △ P
maxrepresent the ventilation property of cohesive zone; TP
maxrepresent the temperature corresponding to maximum differential pressure.
From table 1 ~ 4:
(1), bentonite (wilkinite) proportioning substantially constant in the pellet forming process index of pellet is 2%, green-ball moisture is when slightly fluctuating, add the shatter strength of green pellet of different ratios serpentine, compression strength of green pellet, dry after pelletizing ultimate compression strength all can meet band process technical requirements.
(2) below 1.80%, (1.8% is controlling valu to finished ball nodulizing content of MgO, 1.81% is analytical value, select controlling valu), no matter with addition of the ratio of serpentine, finished ball nodulizing ultimate compression strength can meet BF Technology in Bao Steel requirement completely.
(3) along with the raising of its serpentine proportioning, pelletizing rate of expansion is obvious downtrending, and when in pellet, content of MgO brings up to 1.80%, its melting position in blast furnace obviously moves down, and this is conducive to the improvement of blast-furnace smelting high-temperature zone ventilation property.
Claims (5)
1. belt machine produces a magnesia pellet raw material, according to weight percent meter, comprising: iron-bearing material, serpentine and wilkinite, and serpentine is 1.0 ~ 2.5% of compound, and wilkinite is 2% of compound; Wherein,
Iron-bearing material comprises: the first iron ore concentrate 0 ~ 45%, second iron ore concentrate 55% ~ 100%; The chemical composition of the first iron ore concentrate, according to weight percent meter, comprising: TFe65.8 ~ 66.6%, FeO28.5 ~ 29.1%, MgO0.87 ~ 0.98%, CaO1.13 ~ 1.73%, Al
2o
3≤ 0.2%, SiO
21.05 ~ 2.04%, S0.54 ~ 0.83%, P≤0.05%, K
2o≤0.15%, Na
2o≤0.07%; In first iron ore concentrate, the per-cent that the concentrate of granularity≤0.074mm accounts for the first iron ore concentrate gross weight is at least 95%; The chemical composition of the second iron ore concentrate, according to weight percent meter, comprising: TFe64.91 ~ 65.83%, FeO27.9 ~ 29.0%, MgO0.89 ~ 1.13%, CaO1.06 ~ 1.94%, Al
2o
3≤ 0.8%, SiO
22.99 ~ 4.01%, S0.45 ~ 0.57%, P≤0.05%, K
2o≤0.08%, Na
2o≤0.08%; The per-cent that in second iron ore concentrate, the concentrate of granularity≤0.074mm accounts for the second iron ore concentrate gross weight is at least 90%;
Serpentine, according to weight percent meter, comprising: SiO
2>=38%, MgO>=38%, CaO≤1%, Ig≤13%, granularity≤0.074mm in serpentine.
2. belt machine produces magnesia pellet raw material as claimed in claim 1, it is characterized in that: the first iron ore concentrate is 40% of iron-bearing material, second iron ore is 60% of iron-bearing material, the weight percent of serpentine in pelletizing compound is 1.5%, and the weight percent of wilkinite in pelletizing compound is 2%.
3. belt machine produces a magnesia pellet method, comprising:
Iron-bearing material, serpentine and wilkinite be fully mixed to get compound in strong mixed machine, and serpentine weight percent is 1.0 ~ 2.5% of compound, and wilkinite weight percent is 2% of compound; The component of iron-bearing material comprises according to weight percent: the first iron ore 0 ~ 45%, second iron ore 55% ~ 100%; First iron ore concentrate, according to weight percent meter, comprising: TFe65.8 ~ 66.6%, FeO28.5 ~ 29.1%, MgO0.87 ~ 0.98%, CaO1.13 ~ 1.73%, Al
2o
3≤ 0.2%, SiO
21.05 ~ 2.04%, S0.54 ~ 0.83%, P≤0.05%, K
2o≤0.15%, Na
2o≤0.07%; In first iron ore concentrate, the per-cent that the concentrate of granularity≤0.074mm accounts for the first iron ore concentrate gross weight is at least 95%; Second iron ore concentrate comprises according to weight percent meter: TFe64.91 ~ 65.83%, FeO27.9 ~ 29.0%, MgO0.89 ~ 1.13%, CaO1.06 ~ 1.94%, Al
2o
3≤ 0.8%, SiO
22.99 ~ 4.01%, S0.45 ~ 0.57%, P≤0.05%, K
2o≤0.08%, Na
2o≤0.08%; The per-cent that in second iron ore concentrate, the concentrate of granularity≤0.074mm accounts for the second iron ore concentrate gross weight is at least 90%; Serpentine comprises according to weight percent meter: SiO2>=38%, MgO>=38%, CaO≤1%, Ig≤13%, granularity≤0.074mm in serpentine;
Compound pelletizing in balling disk (-sc) is obtained green-ball, green-ball is carried out drying via belt machine blasting drying period and down-draft drying zone, preheating section carries out preheating, firing section carries out roasting, soaking zone carries out pellet recrystallize, then cool cooling one section and two sections, finally obtain magnesia oxide pellet; The machine speed of belt machine at 1.4m/s ~ 1.6m/s, the condition of blasting drying period: temperature is 150 ~ 250 DEG C, the time is 4.69 ~ 5.36min, wind speed 2.2 ~ 2.5m/s; The condition of down-draft drying zone: temperature is 240 ~ 330 DEG C, the time is 3.75 ~ 4.29min, wind speed 1.1 ~ 1.4m/s; The condition of preheating: temperature is 600 ~ 900 DEG C, the time is 3.13 ~ 3.57min, wind speed 1.2 ~ 1.5m/s; The condition of roasting: temperature is 1240 ~ 1280 DEG C, the time is 6.25 ~ 7.14min, wind speed 1.2 ~ 1.5m/s; The condition of soaking: temperature is 800 ~ 1000 DEG C, the time is 3.13 ~ 3.57min, wind speed 1.2 ~ 1.5m/sa; Cool the condition of a section: temperature is 750 ~ 850 DEG C, the time is 9.38 ~ 10.71min, wind speed 1.5 ~ 1.7m/s; Cool the condition of two sections: temperature is 290 ~ 350 DEG C, the time is 3.75 ~ 4.29min, wind speed 1.9 ~ 2.2m/s.
4. belt machine produces magnesia pellet method as claimed in claim 3, it is characterized in that: the first iron ore concentrate is 40% of iron-bearing material, second iron ore is 60% of iron-bearing material, the weight percent of serpentine in pelletizing compound is 1.5%, and the weight percent of wilkinite in pelletizing compound is 2%.
5. belt machine produces magnesia pellet method as claimed in claim 3, it is characterized in that: magnesia pellet is according to weight percent meter, and content of MgO controls in 0.98% ~ 1.80% scope.
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| CN104561534A (en) * | 2015-01-26 | 2015-04-29 | 内蒙古包钢钢联股份有限公司 | Magnesium containing fluxed oxide pellets and preparation method thereof |
| CN104789757A (en) * | 2015-04-28 | 2015-07-22 | 内蒙古包钢钢联股份有限公司 | Pellet ore with surface adhered with calcined magnesite and preparation method thereof |
| CN107604156A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of oxide pellet and preparation method thereof |
| CN111074066A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | High-magnesium pellet ore and production method thereof |
| CN113088686A (en) * | 2021-03-29 | 2021-07-09 | 天津市新天钢联合特钢有限公司 | Pellet produced by shaft furnace without using moistening mill and production method thereof |
| CN114058841A (en) * | 2021-11-16 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for controlling chemical components of alkali-containing metal pellet ore by controlling reduction expansion rate |
| CN114410958A (en) * | 2022-02-28 | 2022-04-29 | 安徽工业大学 | Production method for reducing pulverization of pellets |
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| CN107604156A (en) * | 2017-08-31 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | A kind of oxide pellet and preparation method thereof |
| CN111074066A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | High-magnesium pellet ore and production method thereof |
| CN113088686A (en) * | 2021-03-29 | 2021-07-09 | 天津市新天钢联合特钢有限公司 | Pellet produced by shaft furnace without using moistening mill and production method thereof |
| CN114058841A (en) * | 2021-11-16 | 2022-02-18 | 包头钢铁（集团）有限责任公司 | Method for controlling chemical components of alkali-containing metal pellet ore by controlling reduction expansion rate |
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