Material Handling of Highest Complexity

Raw Materials Handling

Material Handling of Highest Complexity

Large-scale Raw Materials Handling at Bushan Steel's Integrated Steel Plant
For the expansion of Bhushan Steel’s steel plant at Meramandali, India, Larsen and Toubro carried out the design, engineering, supply, erection, testing and commissioning of the raw material handling system that included 43 kilometres of belt conveyors, a wagon and truck unloading system, eight stacker/reclaimers and three bucket wheel reclaimers.
(ed. WoMaMarcel - 09/10/2015)
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Stockyard and Yard Machines

Stockyard and the yard machines are designed to cater the raw material needs for the 6 million tonnes per year stage. The stock yard is serviced by eight stacker/reclaimers and three bucket wheel reclaimers (see Figs. 4 and 5). Out of the total eleven yard machines, ten machines have been supplied and erected by L&T including one stacker/reclaimer which comes within a covered storage area. The brief specifications of the yard machines are furnished in Table 2.

Sinter Base Blending System

This circuit comprises of the raw material preparation and handling system for feeding raw materials from stock yards to sinter plants SP2 and SP3, conveying product sinter to the blast furnace stock house, coke and lump ore to blast furnace stock house and handling coke/sinter fines generated in stock house.

The primary reason of adding sinter in the blast furnace is to increase its efficiency. Sinter is produced using base mix in the base blending system and the course of raw materials is given in the following sections.

Fig. 4: One of the three bucket wheel reclaim- ers installed at the raw material stockyard.

Fig. 5: Stacker/reclaimer No. 7 operates in a covered stockyard.
Table 2: Stockyard and base blending machines, materials handled and main specifications.

Iron Ore Fines, Limestone and Dolomite

Iron ore fines reclaimed from the yard will be discharged on to eight bins in the base bin building through reversible shuttle conveyor and charging hatches.

The limestone and dolomite reclaimed from the stock yard is fed on to the surge bins in the flux crushing and screening building. The flux (+25 to 50 mm) is crushed to predominantly (-3 mm) with the help of three reversible hammer mill crushers (2W+1S) and the oversize material (+3 mm), screened using flip flop screens, is crushed with the help of three secondary reversible hammer mill crushers (2W+1S). The flip flop screens ensure recirculation of (+3 mm) size to the secondary crushers. Thus (-3 mm) flux produced during closed loop crushing and screening system is transported to the four bins in the base bin building through four high angle conveyors (vertical conveying system) due to space constraint and reversible shuttle conveyor. Vibro feeders are used to regulate the feed to crushers and screens.

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