Manufacturing Facilities - Other
Facilities
Acid Regeneration Plant
Process
The hydrochloric acid used in the pickling line
after its use, when its concentration falls below 6%, is sent for regeneration to the ARP
installed. This reduces the consumption of fresh acid and also the cost of treating the
effluents of the plant. The waste pickle liquor collected from the line is sent into a
roaster at high temperature. Hydrolysis of the stock takes place and iron chloride
separates from the spent acid and mixes with the excess water to form iron oxide and
regenerated acid. The regenerated acid in vapor form passes upwards and is passed thro a
venturi to increase its concentration. The iron oxide falls to the bottom of the roaster
and is collected in bags for disposal as a by-product.
Quality checks
1. Concentration of acid in regenerated acid
should be minimum 18%.
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| Acid Regeneration Plant (Rear
view) |
Acid Regeneration Plant |
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Roll Grinding Shop
Facility: For servicing the critical roll
requirement of the two mills (6 Hi Cold Rolling and 4 Hi two stands Temper / DCR mill)
there is a Herkules - WS 450 - 20 x 5000 CNC based Roll Grinder. This grinder has a
capacity to grind rolls with a diameter ranging from 50 to 1450 mm. Maximum work piece
weight is 25 tonnes. The grinding wheel used is of 46, 80 100 and 120 grit. Its tolerances
during grinding are 0.002 mm in diameter and roundness and 0.002 mm / meter in
parrallelity. Coupled along with this machine is a shot blaster roll etching unit for
feeding the first stand of the temper mill.
Quality checks
1. Crack and bruise on the ground rolls using
eddy current
2. Roll diameter and roundness
3. Profile of the ground roll
4. Surface roughness
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| Roll Grinding Machine |
Shot Blasting Machine |
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