Technology elaboration for borate ore utilization at iron ore pellets production

Input of intensifying additives, influencing the strengthening of iron ore pellets, can be one of methods to strengthen the pellets and to decrease the volume of fines in them. Boron oxide ore borate ore can be used as such additives. Study of technology aspects of boron-containing pellets production and elaboration of technology of boron input into Kachkanar vanadiumcontaining raw materials was the purpose of the study, aimed at exclusion from BF burden of sinter, which does not contain vanadium. A possibility was justified to use borate ore at iron ore pellets production by a partial substitution of bentonite. Influence of borate ore additives on pellets metallurgical properties studied. As a result of laboratory studies it was determined, that the borate ore has not binding properties and its utilization is possible only in a mixture with bentonite. Optimal content of borate ore in pellets determined, exceeding of which a decrease of reducibility is observed, accompanied by a considerable swelling, which makes impossible the utilization of such pellets in blast furnaces. It was shown, that input of optimal volume of borate ore additives enables to keep the reducibility and swelling at the level of Kachkanar pellets being produced. The mechanism of borate ore content influence on strength characteristics of burnt pellets and their behavior during reducing studied. The regularity of borate ore additives influence on cold and hot pellets strength determined. It was determined, that at input of 0.5% of borate ore practically does not influence on the pellets reducibility while swelling will be constant. The input of borate ore up to 2% will result in a sharp increase of swelling. The decrease of reducibility with simultaneous increase of swelling of pellets having more than 0.5% of borate ore does not allow using such pellets in blast furnaces. Recommendations provided for slag regime optimizing, decreasing of metal losses with slag and test BF heats of pellets, having optimal additives of borate ore and bentonite carrying out.

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The transition to the production of non-bentonite highly basic iron ore pellets on a flux bond is a real solution to the complex problems of raw material preparation and the blast furnace process

Metallurgicheskaya i gornorudnaya promyshlennost ◽

10.33101/s001-11019 ◽

2019 ◽

pp. 2-5

Author(s):

Zh.V. Svyrydenko ◽

M.V. Yagolnik ◽

V.M. Zakharchenko

Keyword(s):

Iron Ore ◽

Raw Materials ◽

Bentonite Clay ◽

Raw Material ◽

Practical Significance ◽

Blast Furnaces ◽

Iron Ore Pellets ◽

Ore Pellets ◽

Output Increase ◽

Technical And Economic Indicators

Purpose. Show the possibility of producing bentonitic iron ore pellets with basicity of 0.6-1.2 on a flux bond. Methodology. Testing the properties of the flux binder in the production of pellets at different stages of technology. Analysis of the properties of the obtained pellets and technical and economic indicators of the operation of the firing conveyor machine during the periods of pellet production using bentonite clay and using a flux bond. Results. The advantages of the flux ligament compared to the bentonite are shown. The characteristics of the experimental pellets are given and the economic efficiency of using this technology is proved (bentonite output, increase in iron content, as well as the productivity of roasting machines up to 10%). The scientific novelty of the work lies in the fact that the formation mechanism and the rate of hydration of the flux bond as well as the time of formation of the colloidal binder solution have been clarified. A method of preparing a binder flux has been developed, which allows taking into account all the features of the raw materials and the existing products in the agglomeration factories. The practical significance lies in the possibility of introducing a technology for the production of pellets on a flux bundle in the conditions of any mining plant, which allows: to get rid of the use of bentonite clay, to increase the productivity of kiln machines, to reduce the consumption of limestone and coke in blast furnaces, to increase the productivity of blast furnaces. Il 3. Tab. 3. Bibliogr .: 3 titles. Keywords: non-bentonitic pellets, flux binder, efficiency.

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Utilization of High Sulfur Raw Materials in Iron Ore Pellets

Journal of Iron and Steel Research International ◽

10.1016/s1006-706x(13)60173-9 ◽

2013 ◽

Vol 20 (10) ◽

pp. 32-38 ◽

Cited By ~ 3

Author(s):

De-qing Zhu ◽

Zhi-yong Ruan ◽

Tie-jun Chun ◽

Jian Pan

Keyword(s):

Iron Ore ◽

Raw Materials ◽

Iron Ore Pellets ◽

Ore Pellets

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Change in Oxidizing and Reduction Roasting of Complex Iron-Titanium Ores

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.380.181 ◽

2017 ◽

Vol 380 ◽

pp. 181-185

Author(s):

Andrey N. Dmitriev ◽

R.V. Petukhov ◽

G.Yu. Vitkina ◽

Alexey V. Dolmatov ◽

L.A. Ovchinnikova

Keyword(s):

Phase Transformations ◽

Iron Ore ◽

Raw Materials ◽

Reduction Roasting ◽

Iron Ore Pellets ◽

Ore Pellets

The questions of oxidizing roasting of iron ore raw materials with production sinter and pellets are considered. The question of reduction roasting of iron ore raw materials is studied. Phase transformations of oxidizing and regenerative roasting are considered. Features of phase transformations of iron ore raw materials containing titanium are discussed. The reducibility, durability and temperatures of softening and melting of metallurgical iron ore raw materials are studied In Vitro. The effect of the durability of burned iron ore pellets on compression is also defined.

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Iron ore pellets as a solution to steel—making raw materials at the crossroad and dominant constituent of basket of iron ores available for export in the future

Mineral Economics ◽

10.1007/s13563-013-0040-6 ◽

2013 ◽

Vol 26 (3) ◽

pp. 127-141 ◽

Cited By ~ 2

Author(s):

G. D. Kalra

Keyword(s):

Iron Ore ◽

Raw Materials ◽

Iron Ores ◽

Iron Ore Pellets ◽

Ore Pellets ◽

Steel Making ◽

The Future

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Improvement of iron ore pellets metallurgical properties by their fluxing by lime

Ferrous Metallurgy Bulletin of Scientific Technical and Economic Information ◽

10.32339/0135-5910-2021-1-11-19 ◽

2021 ◽

Vol 77 (1) ◽

pp. 11-19

Author(s):

V. V. Bragin ◽

I. S. Bersenev ◽

G. G. Bardavelidze ◽

A. V. Borodin ◽

N. A. Spirin ◽

...

Keyword(s):

Blast Furnace ◽

Iron Ore ◽

Partial Substitution ◽

Content Increase ◽

Furnace Charge ◽

Iron Ore Pellets ◽

Metallurgical Properties ◽

Ore Pellets ◽

Blast Furnace Charge ◽

Slaked Lime

Fluxed iron ore pellets, obtained by application of raw limestone are widely used in the iron ore share of blast furnace charge. Decomposition of the raw limestone in the process of the pellets burning requires considerable energy. The purpose of the work was to study quality variation of raw and burned pellets, as well as metallurgical properties variation, caused by substitution of limestone by burned and slaked lime. Physical simulation of the pelletizing process and pellets burning process was done. In the process of the experiment simulation of total and partial substitution of limestone by lime as well as with partial substitution of limestone by slaked lime was accomplished. Diagrams of plasticity and strength of raw and burned pellets at various shares of limestone, burned and slaked lime presented. It was shown that the strength during reducing RDI-1 (ISO 4696-1) has a tendency to increase when application of lime. Increase of Index RDI+6,3 value accounted for 3.6% (abs.) at application of quicklime and slaked lime correspondently. Index RDI−3,15 value decreased by 1.06% (abs.) and 0.88% (abs.) and that of index RDI−0,5 – by 0.75% (abs.) and 0.8% (abs.) at application of quicklime and slaked lime correspondently. It was assumed that application of slaked lime can contribute to bentonite share decrease and thus to total iron content increase. It was established that application of lime enables to decrease heat consumption for pellets burning. Application of slaked lime instead of limestone in the process of pellets production results in an increase of their strength during reducing and compression strength. This effect enables to reach a higher efficiency in the process of such pellets usage in blast furnace charge or in the process of their metallization, comparing with the usage of pellets fluxed by limestone.

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