Re: Dust Extraction For Iron Ore Shiploader
Dear Sirs,
please contact our agency VAC air Technology AT Sout Africa
by warren@vacair.co.za
phone 0027 11 4727311
May be they can help you
With best regards
VSR Industrietechnik GmbH
47198 Duisburg
Germany
Export Manager
W. Schlabach ■
Re: Dust Extraction For Iron Ore Shiploader
Hi!
You are not alone with your problem. Many people and companies are loking for solutions to resolve this problem, and only few of them are lucky.
You have very high rate of loading, but widespread kind of cargo and many similar systems for this task were designed.
Basically the construction of dust extraction system depends on the type of your shiploader. Maybe if you can give more information about your shiploaders' design, i will advace you about companies that can really help you.
Best regards. ■
Dust Extraction For Iron Ore Shiploader
Hugo,
In Australia, all iron ore shiploaders depend on water addition (dust suppression) with a final application at the end of the boom. When the system is well designed and moisture is raised to 4% or 5%, this method is more successful than dust collection.
Once the material has reached the end of the boom, especially at 10,000 t/h, you have no chance of catching the dust.
Michael Reid. ■
Re: Dust Extraction For Iron Ore Shiploader
Michael
Can you please send me the locations of such shiploaders with the spray systems on board in Australia. Traveling loaders prefered. There is a possibility of visiting Australia and then we can visit those machines.
All dust extraction proposals lead to dead ends due to high volumes. ■
Dust Control On Iron Ore Shiploaders.
Hugo,
Dust extraction doesn't work except where there are enclosures, i.e., transfer chutes, screens etc.
Dust suppression is a process of gradually adding water and maintaining the moisture level from the mine to the port. Trying to add it all in one go causes blockages and mess. Stacking, reclaiming and shiploading are the dustiest operations.
The ports I have direct experience of are Port Hedland and Finucane Island (BHP Billiton), Dampier, Cape Lambert and East Intercourse Island (RioTinto).
I can send contact names by email if you like.
Regards,
Michael Reid. ■
Re: Dust Extraction For Iron Ore Shiploader
Dust suppression system well used for stacking, but if we are talking about cape size vessels loading: Isn't it means that we have to put abt 4,000 tonnes of water per each 100,000 tonnes of loaded weight? ■
Re: Dust Extraction For Iron Ore Shiploader
Dust suppression system well used for stacking, but if we are talking about cape size vessels loading: Isn't it means that we have to add abt 4,000 tonnes of water per each 100,000 tonnes of loaded weight? ■
Dust Extraction For Iron Ore Shiploader
Run of mine ore has an inherent moisture content (sometimes as high as 7% if mined below the water table). The trick with dust suppression is to maintain that at 4% or 5% all the way through processing, stockpiling and reclaiming. It is not necessary to add 4% all in one go. That would be a disaster.
Michael Reid. ■
Re: Dust Extraction For Iron Ore Shiploader
Hi
Our company supplies equipment of dust suppression system by wetting agent + water spraying.
We have just finished the equipments of 4 ship unloader for Arcelor in France
WWW.ramenvironnement.com
ram@ramenvironnement.com
Contact : Mr Deniel : +33 2 38 46 31 10
GG ■
Re: Dust Extraction For Iron Ore Shiploader
Several years ago I did a modelling exercise on dust control during shiploading. It was not iron ore, but a dense material that needed to be kept dry.
At that stage, there was nothing available commercially that could control the problem.
I offer a few comments on the process of loading.
The falling orestream entrains air both within itself and as a boundary layer, which causes dusting. This effect has been described by various researchers and is summarised in this paper:
Cooper P, Arnold P C. Air Entrainment and Dust Generation from a Falling Stream of Bulk Material. Kona Powder and Particle No. 13 (1995)
The falling orestream acts like a pump, circulating a load of dust within the hold. If the hold were a piece of fixed plant, one could install baffles to encourage settling. But this is not possible with ship's holds. However, hold geometry can have an effect, and this is described in:
Jünemann R, Holzhauer R. The Reduction of Dust Emissions in Bulk Handling Installations. Bulk Solids Handling, Volume 12, No. 2 May 1992.
The interaction of cross winds with the circulating load of dust in the hold is significant. I doubt that an extraction system alone could cope with it.
In the case of iron ore, I tend to agree with Michael's comments above, which reflect a broader view I have expressed here before and will continue to espouse. Water control throughout the whole process is critical to the end result. ■
A Wildcard
I was reflecting on this subject and it occurred to me that this might be one potential application for the use of a foam suppressant.
The concept has been around for a while and I have never seen it used, but in this particular application, if the foam was of suitable consistency and you could fill the hold with it, it might just work. Loading visibility is a first obvious problem.
I leave it to you to hunt it down if you think it worthwhile. ■
Dust Extraction Foriron Ore Shiploader.
Horrors!
First of all, you would have to get sufficient volume of foam and then keep replenishing it, I imagine. You would need to get agreement from customer, ship owner etc. Might have trouble with wind. Probably very expensive.
Seen it used in iron ore conveying, not impressed.
Michael Reid. ■
Horrors
>>Seen it used in iron ore conveying, not impressed.
LOL! I was not too impressed with the concept when it was first presented to me. I am interested to hear that you have observed it. I wonder if it was a mutual colleague that was the instigator.
I don't know about the costs of foam, but I suspect that a the cost of a cubic meter of foam is insignificantly small in comparison with the cost of a cubic metre of iron ore.
The replenishment rate should be mainly determined by the effects of cross winds I think. And that would be a function of the foam consistency.
Foam could potentially counteract the in-hold circulation that is a key to dust emissions at loading.
Approvals should not be a problem for a single trial.
If it went pear shaped, and large chunks of foam drifted across the harbour, then maybe it could be passed off as an artistic endeavour.
You have to float a few 'out there' ideas or it gets too boring. ■
Dust Suppression
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For N R D Industries
DIPALI SHAH. ■
Dust Extraction for Iron Ore Shiploader
We are loading Iron Ore in South Africa at a rate of 10 000 metric tonnes per hour into Cape size vessels.
We want to look into a dust extraction system to be installed. Can anybody be of help of companies that have such systems running in the rest of the world?
Hugo Lombaard ■