Iron ore pelletization

Acrylamide copolymers are effective iron ore pellet binders (118). When the ore slurry in water has a pH above 8, anionic polymers are effective. If the ore is acid washed to remove manganese, then a cationic polymer is effective. 

Heat hardening of green iron-ore pellets is accomplished in a vertical shaft furnace, a traveling-grate machine, or a grate-plus-ldln combination (see Ball et al., op. cit.). 

Fig. 22. Mean diameter of iron ore pellets as a function of the number of disk revolutions. [From Kanetkar (K1).]... 

Fig. 23. (I) Effect of water content on the growth rate of agglomerates sand granules grown by crushing and layering mechanism [from Capes and Danckwerts (C5)]. (II) Limestone nuclei by random coalescence [from Kapur (K2)]. (Ill) Limestone balls by nonrandom coale-scene [from Kapur (K4)]. (IV) Iron ore pelletized in a disk.[From Kanetkar (K1)].

Fig. 24. Effect of bentonite additive on the balling rate of iron ore pellets. [From Kapur et al. (K7).]...

Other Tests. The so-called tumbler tests are usually used for testing material like coke, coal, iron ore pellets or tablets. They can be divided into drum tests and ball mill type tests. The latter type is used to derive both the Hardgrove Index and the Bond s Work Index, which are often used to classify the material friability as described in Sec. 3. They are generally more suited to coarse material. The Hardgrove Grindability test requires an initial size range form 595 to 1190 microns. 

Airborne particles collected with filters distributed across Vitoria, Brazil were analyzed by MB spectroscopy, whereby certain Fe-bearing minerals indicated different pollution sources. For example, hematite comes mostly from iron ore pellet plants, pyrite from handling and storing coal in the industrial area, and magnetite is related to steelwork plants (de Souza et al. 2001). 

Iron-nickel alloys, 17 101 Iron-nickel martensitic alloys, 23 308 Iron(II) nitrate hexahydrate, 14 541 Iron(III) nitrate hexahydrate, 14 541 Iron ore(s), 14 494-497 agglomeration of, 14 497 beneficiation of, 14 495-497 economic aspects of, 14 523 high- and low-grade grade, 14 495-496 reduction of, 14 510-513 sources of, 14 494-495 U.S. consumption of, 14 527t Iron ore pelletizing, smectites application, 6 697t, 698... 

D. L. Death, A. P. Cunningham and L. J. Pollard, Multielement analysis of iron ore pellets by Laser-induced breakdown spectroscopy and principal components regression, Spectrochim. Acta, Part B, 63, 2008, 763-769. 

Steel Electric Furnace Baghouse Dust, BOF Dust, OH Dust, Coke Fines, Raw Materials, Iron Ore Pelletizing... 

Previous studies of direct reduction on iron ore pellets have been reviewed by Themelis(1), Bogdandy(2) and Huebler(3). Work on reduction by mixtures has been reported by Szekely(4) and Hughes et al(5). Modelling studies on countercurrent moving bed systems have been reported by Spitzer(6) for isothermal reduction in hydrogen, by Miller(7) for non-isothermal reduction in carbon monoxide and more recently by Tsay et al(8) and Kam and Hughes(9) for C0/H2 mixtures. However, since iron is known to be a catalyst for the water gas shift reaction, this reaction will influence the gas composition and therefore the extent of reduction. None of the previous analyses have considered this aspect and the objective of the present paper is to account for the overall reduction by inclusion of this reaction. 

First commercial iron ore pelletizing plants in operation. Dramatic increases in plant capacity. 

D.S. Cahn and J.M. Karpinski, Compression testing of green and dry iron ore pellets, Trans. Amer. Inst. Mining Eng., 241 (1968) 475—481. 

J.R. Wynnyckyj and W.A. McCurdy, Causes of the shell and core structure and layered inhomogeneity in iron ore pellets, Met. Trans., 5 (1974) 2207—2215. 

Some attempts have been made to include more of these effects in equations to predict optimum moisture content for balling. For example, the following equation has been derived [10] for the optimum moisture content of green iron ore pellets ... 

Fig. 3.7. Effect of particle size and size distribution on the growth rate of iron ore pellets in a laboratory balling drum [13]. (By permission The Institution of Mining and Metallurgy.) [Hematite ore, minus 300 mesh (o) and minus 120 plus 200 mesh ( ). ]...

Typical data on shaft furnaces for iron ore pelletization [2]. 

Some characteristics of a modern travelling grate iron ore pelletizing machine [7]. 

Process design factors for iron ore pelletizing machines [8]. Factors are based on effective areas. 

A.A. Dor, A. English, R.D. Frans and J.S. Wakeman, Design trends and operating experience in iron ore pelletizing plants, Proc. Int. Miner. Process. Congr., 9th (Prague, 1970) 173-238. 

Electric Furnace Baghouse Dust, BOF Dust, OH Dust, Coke Fines, Raw Materials, Iron Ore Pelletizing Baghouse Dust, Mold Sand Fines Silicon, Ferrosilicon, Ferromanganese, Ferrochrome Concentrates, Smelter Dust, Precipitates Concentrates, Sinter Mix, Flue Dust, Drosses Tungsten, Molybdenum, Antimony, Brass, Tin,... 

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