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Date: 2007-2008

Project Description:The subject of this project is construction of plant for blast furnace slag granulation. The envisaged annual capacity of the plant is granulation of 530,000 tons of liquid slag. The plant for granulation of blast furnace slag is an addition made within the scope of the modernization project for the existing Blast Furnace, and is also part of the technological entity for production of crude iron.

The technology of slag processing through granulation starts by effusion of slag from the Blast Furnace. The melted (liquid) slag at the temperature of 1300°C – 1550°C is led into granulation chamber through a channel system (with an internal refractorylining).

A direct contact between pressurized water stream and melted liquid slag takes place in the granulation chamber. Due to rapid cooling and the impact of water pressure, the melted slag is granulated into small, 12 mm particles which form a hydro mixture with water, and then are transported to the granulated slag basin through the channel. In the granulated slag basin the granulated slag cools down, and the slag is taken out of the basin with a crane equipped with a grab bucket and transferred to draining bins where the slag is relieved from the water surplus through draining. The drained slag is extracted from draining bins onto the conveyors system to the loading bin via brimming hopper. From the loading bin the slag is gravitationally extracted and batched into the mobile bin scale where it is weighed and then gravitationally loaded into railway wagons or trucks which ends the process of producing granulated slag.

Charachteristics:

Direct Slag Granulation System is consist of following parts:

Granulation chamber
Granulation chamber is built as a steel metal form where the melted liquid slag is treated by water jets. The vapor that is developed during the contact of melted slag and water in the granulation chamber is drained by steam pipeline inside of which the granulation chamber is situated

Steam pipeline
The steam pipeline is build as a cylindrical steel metal structure through which the vapor developed in the granulation chamber is brought outside of the plant, and the top of the steam pipeline is located above the roof of the hall.

Steam pipeline diameter in the beginning D= 4,5 m
Steam pipeline diameter in the end D= 3,5 m
Steam pipeline height L= 46 m

Granulation basin
Basin length L= 30 m
Basin width B= 14 m
Basin depth H= 4 m

Two Bridge cranes with grab buckets
Lifting capacity Q= 10 t

Draining bins
Volume of one segment V= 100 m3

Belt conveyor T1
L= 29.4 m
Conveyor capacity Q= 150 t/h

Belt conveyor T2
L= 95.5 m
Lifting height H= 23,6 m
Conveyor capacity Q= 150 t/h

Loading bin
Total volume of loading bins V= 300 m3
Height of loading bin structure H= 24 m

Automotive bin scale
Volume of scale bin V= 19 m3
Carrying capacity of the balance cart N= 300 kN

Wagon positioner
Tensile force of the cart V= 8000 kg
Maximum stroke of the cart L= 24 m

Water Distribution System
The direct slag granulation system also includes the
distribution of all waters used in slag granulation process.

Scope of Work:

»Basic and detail design of Direct Slag Granulation System
» Manufacturing of equipment
»QA During Manufacturing
»Erection and commissioning
» Start-Up
» Testing
» Training of Production and Maintenance personnel