Iron Ore Fines are transported from mines to manufacturing site in BOBSN Rakes. These Rakes are unloaded at various Track Hoppers (TH) and then supplied onwards.
BOBSN type of wagons are side-discharge type, where the doors on both the sides of wagons are opened and Iron Ore fines (IOF) is expected to flow down from wagons, under gravity, into the hoppers below, from where it then gets transported through a series of Conveyors. However, at times the IOF does not flow under gravity because of stickiness and requires poking of the floor and walls of the wagon to create vibration and make IOF flow. Stickiness depends on multiple factors such as mineralogy index, moisture, and weather.
Wagons having non-sticky IOF gets unloaded within 120 minutes, whereas the Wagons with Sticky IOF may take up to 20 hrs.
The problems faced because of stickiness are as below.
- Continuous manual poking on wagon floor to release IOF causes fatigue.
- Unpredictive unloading time makes it difficult to plan the Iron Ore inventory.
Owing to the above problems, we are seeking solutions to unload iron ore fines from wagons within 165 minutes regardless of their stickiness.
The proposed solution should address one or both of the following requirements:
- Make the iron ore fines non-sticky at the loading point.
- If stickiness of iron ore cannot be avoided, then solution should ensure that the emptying time of sticky iron ore fines is same as non-sticky iron ore fines.
Multiple options were tried out to solve this problem, as:
- Usage of high-pressure multi-nozzle water jet & high-pressure water jet
- Vibrating the wagons with devices used for vibrating concrete
- Plastic curtains spread in the wagon separating IOF and the walls (of wagon) before loading of IOF
- Usage of air pressure jet
- Drilling through the ore
Awards:- INR 20,00,000