taconite balling drum

Figure 5 presents the average pellet diameter as a function of the number of drum revolutions during the batch balling of taconite concentrates with 0.5 and 10.8 % by weight of addition of bentonite and water, respectively. This green ball- growth curve shows a characteristic S-shape indicating varying agglomeration rates.

balling drum design Krech Ojard performed a feasibility study at a northern Minnesota iron ore mine to improve their taconite balling drum design. The project involved the replacement of two existing ten foot diameter drums with two twelve foot diameter drums…

United Taconite May 2010 - Jan 2011 9 ... Monitored process to ensure balling of ore an balling compounds.Detected malfuntions in the drums via a computerized system.Perform labor duties as ...

Clean inner surface of balling drum and moisten very lightly. It may be desirable to precoat inner surface of drum with a thin layer of material being agglomerated. Start rotation of drum and add small quantities of ore in 50 gram amounts to the drum. With a water spray bottle, ensure a fine adequate wetting of the ore surface.

BALLING DRUMS Minnesota Performed a feasibility study at a Northern Minnesota Iron Mine to improve their taconite balling process. The project involved the replacement of two existing ten foot diameter drums with two twelve foot diameter drums, reworking feed and takeaway conveyors, and replacing the existing roll screens with wider,

Taconite mining and processing fall under the North American Industry Classification System (NAICS) 21221 Iron Ore Mining. According to ... C pelletization by wet tumbling with a balling drum or balling disc; and C indurating using a vertical shaft furnace, straight grate, or grate/kiln, and material

1.3 Balling process In this process, balling equipment produces green balls from the pre-wetted material prepared in the previous process. The green balls are produced either by a balling drum (Fig. 5), or by a balling pan (disc) (Fig. 6). Both of the units utilize centrifugal force to form the fine materials into spheroids. The green

Taconite iron ore concentrate is pelletized by mixing the binder of the invention in a suitable amount with taconite concentrate in balling drums and then heat treating. The pellets from the balling drum are referred to as "green balls." Tests are used to determine green ball strength, namely the green ball drop tests and the green ball ...

Pelletizing of animal feeds can result in pellets from 1.2 mm (0.047 in) (shrimp feeds), through to 3–4 mm (0.12–0.16 in) (poultry feeds) up to 8–10 mm (0.31–0.39 in) (stock feeds). The pelletizing of stock feed is done with the pellet mill machinery, which is done in a feed mill.. Preparation of raw ingredients. Feed ingredients are normally first hammered to reduce the particle size ...

US2984860A US855180A US85518059A US2984860A US 2984860 A US2984860 A US 2984860A US 855180 A US855180 A US 855180A US 85518059 A US85518059 A US 85518059A US 2984860 A US2984860 A US 2984860A Authority US United States Prior art keywords drum fines scrapers deflectors balling Prior art date Legal status (The legal status is an assumption and is not …

The following taconite ore production processes will be covered by the rule (EPA, 2001): • liberation of the iron ore by wet or dry crushing and grinding in gyratory crushers, cone crushers, rod mills, and ball mills; • concentrating of the iron ore by magnetic separation or flotation; • pelletization by wet tumbling with a balling drum ...

Real-time fine aerosol exposures in taconite mining operations ... balling drum operator, and concentrator operator) for PM2.5 and RPM. ADSA and PN generally had highest GMs in the pelletizing department, which processed large amounts of …

1.3 Balling process In this process, balling equipment produces green balls from the pre-wetted material prepared in the previous process. The green balls are produced either by a balling drum (Fig. 5), or by a balling pan (disc) (Fig. 6). Both of the units utilize centrifugal force to form the fine materials into spheroids. The green

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iron-rich mixture, and the residue is fed into balling drums where a bentonite clay is added to the mix. The bentonite, mined in Wyoming, binds the semi-loose slurry into pellets in the balling mill. The "green pellets," as they are known to mining engineers, are then placed in a kiln and fired at 3,000 degrees.

Iron ore pelletizing plants rely on high-capacity balling drums to agglomerate ore fines and concentrates into pellets ranging from 8 – 16 mm for optimal performance in the blast furnace. Pelletizing iron ore products in a balling drum offers the following benefits: Mitigation of …

The rotation speed, the depth of the material in the drum (controlled by scrappers), and the time required for balling are constraints that need to be satisfied. The residence time in a drum is given by Eq. (1): T ¼ 0:0037 ðÞ þ 24 L nDS (1) where: T is the residence time (minutes). L is the drum length (feet). D is the drum diameter (feet).

Balling drum operator ... Although taconite processes are similar across all mines currently, the responsibilities for similar job classifications varied slightly between the mines due to the presence or absence of unionization, number of employees, and management. For instance, the workers at mine A, the sole mine in the eastern zone, are non ...

taconite balling drum. Iron Ore Processing for the Blast Furnace. The iron ore concentrate is now mixed and ready for the pelletizing process. Pelletizing A pellet plant contains a series of balling drums where the iron ore concentrate is formed into soft pellets, ...

Balling Drum Design - KrechOjard balling drum design Krech Ojard performed a feasibility study at a northern Minnesota iron ore mine to improve their taconite balling drum design. The project involved the replacement of two existing ten foot diameter drums with two twelve foot diameter drums, reworking feed and takeaway conveyors, and replacing ...

Once the pellets exit the balling drum they are relatively dry and, therefore, have the potential to emit particulate HAP. During the indurating process, the unfired taconite pellets are hardened and oxidized in the indurating furnace at a fusion temperature between 2,290 to 2,550 °F.

Which type of Iron ore is mixed with the binder in a balling drum to form pellets Taconite 2 What three materials are melted in a blast furnace Coke, limestone and iron ore 3 Which ingredient in a blast furnace combines with impurities to form slag Limestone 4

the detrimental effect of di-valent cations in balling. In hydrometallurgy, drum filters are used, so wash water can be sprayed on ·filter cakes to recover the leached values (Cu, Au, etc.) in interstitial water. In the taconite industry, however, disc filters are used. Filter cakes on disc filters may become unstable when wash water is applied.

Balling drum The balling drum equipment fundamentally consists of an inclined rotating cylindrical shell with water sprays in its inlet end, where the feed material is introduced to make balls. All formed pellets are discharged, regardless of particle size, which is different from the disc where only balls larger than a certain size are discharged.

This mixture is blended together in a mixer and fed to balling discs or drums to produce green pellets of size typically about 9-16mm. The green pellets are then fed to the induration machine. Both straight grates and grate kilns dry the pellets out in a drying section, then bring the pellets up to a temperature of about 800-900 °C in a ...

The balling drum comprises a large cylindrical drum having a generally horizontal but slightly inclined axis. As the drum rotates, particles of the concentrate form nuclei, and, due to the rotation and inclination of the drum, partake of a rolling action which results in the formation of balls which are commonly referred to as green pellets.

Taconite is a hard, banded, low-grade ore, and is the predominant iron ore remaining in the ... generally is accomplished by tumbling moistened concentrate with a balling drum or balling disc. A binder, usually powdered bentonite, may be added to the concentrate to improve ball formation and the

Taconite mining and processing on the Iron Range in northeastern Minnesota releases mineral fibers and particles that have been a public concern since the 1970s (Higgins et al., ... Balling drum operators run and check on the balling drums and the pellets in this building ...

S. Sastry and D. W. Fuerstenau, A laboratory method for determining the balling behavior of taconite concentrates, Trans. SME/AIME, 250 (1971)64_ 11 P. C. Kapur, Balling and agglomeration, Adv_ Chem- Eng., 11 (1977) 55. 12 C. E. Capes and P. V. Danckwerts, Granule formation by the agglomeration of damp powders- Part I_ The mechanism of granule ...

From the balling drum, the unfired pellets are conveyed to the indurating furnace. The unfired taconite pellets enter the induration furnace where they are hardened and oxidized at a temperature of between 2,290 to 2,550 degrees Fahrenheit. Indurating furnaces are either straight grate furnaces or grate kiln furnaces.

North America Iron Ore Pellets Market, By Source (Hematite, Magnetite, Taconite and Others), Grade (Blast Furnace and Direct Reduction), Technology (Oxygen Based/Blast Furnace, Electric Arc Furnace and Electric Induction Furnace), Pelletizing Process (Grate Kiln and Straight Travelling Grate), Balling Technology (Balling Disc and Balling Drum), Industry (Construction, Automotive, Railway ...

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The USBM conducted a number of small scale tests using papermill sludge and other additives in place of bentonite as a binder for taconite pellets. Their balling tests indicated that acceptable green-ball strength could be achieved with papermill sludge. The fired pellet evaluations, however, were based on muffle furnace tests which do not ...

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