Originally Posted by r.j.morrish

Hi All,

Due to capacity issues, we have to stockpile our cement clinker in addition to exisitng silos to provide adequate supply to the finish grinding mills during akiln planned shutdown.

For various reasons, we have to cover the plie.

As the storage system will only be used every 14-18months, the costs for a fully automated system do not appear justified, hence, a simpler and dumber concept will probably prevail.

We are thinking of a tensioned fabric shed for the protective storage system. The issues are getting the dusty clinker in the shed and out with powered mobile equipment without having too many issues with visibility etc etc.

I am thinking that we have to look at some sinmple mechanical ways to stockpile the clinker - we are looking at 80 to 100kT of capacity eg

overhead conveyor / tripper car system (but simple shed take this).

ground level side mounted conveyor with stacker or tripper/jet slinger

mobile stacker/slinger.

reclaim would prob. be by FEL with external hopper/reclaimer system - tram clinker to the exsiting hopper/export system.

If anyone can toss their 2 bobs worth my way - that will be appreciated.

I am aware of flat storage ssytem for cement - with FEL operations - but have yet to see one in real life....

I have not considered dome silos as yet. Nothing is out of the questions - sheds, silos, domes etc.

Clinker supply will be via truck loader system attached to existing clinker silo but we could look at option for take off from silo feed ssytem from kiln - rate not high plus temp issues.

Thanks vm.

James M

Hello Mr. Morrish,

A lot of folks use the hoop sheds to store salt and landscape bark, compost, topsoil etc.

Quite often they use the rectangual concrete blocks jokingly refered to as Mafia blocks to act as

walls and barriers between different materials in storage.

The hoop sheds are anchored to the blocks with concrete anchorage bolts and there are hundreds

of them here in the states.

The farmtek folks are the people I bought my two sheds from -even though are small they are of high quality.

www.farmtek.com

is the home page and they are very friendly people to deal with and they export complete hoop sheds as well.

A hoop shed for the amount of material you intend to store has been done ofr other materials.

Using the blocks for the walls and the back would be easy to accomplish by creating a running bond of the blocks

for the side walls and the end.

==========================================================

About storage;

Placing the material will be easy eniugh by using material thrower to pile and stack the clinker without machinery

as the material is simply thrown and allowed to settle with the walls of the structure acting as the containment.

A simple to use grain vacuum system could be used to transfer the clinker from the dumping point out side or

just inside the shed to the material thrower and then to the pile.

A very small skid steer loader could be employed to reclaim the clinker to a vacuum hopper and the grain vacuum

using dilute phase conveying could be used to fill trucks for transprt for further processing.

I will provide more information about the grain vacs and material throwers here

The material throwers require a trailing power cable and the grain vacs can be either diesel or electric portable or stationary.

grain vacuums www.walinga.com

One brand of material throwers Halley and Mellowes Group www.hmagroup.au.com



info@hmagroup.au.com



About the throwers many throwers are offered for sale, the best one

would be one that is mounted on rubber tires to make it easy to move

and position where the HMA have soild wheels for flat floors.

Mesto has material throwers But I am unsure if they have throwers that are rubber tire mounted

and I was unable to determine if the throwers were mounted on tires from the web site

www.redler.com is another supplier of throwers that is wheeled and I would imagine they have a rubber tire mounted model

www.wilsonmdi.com is another supplier of throwers I am unsure of the brand but I will check for you.

Jansen & Huening www.jh.nl offer high speed throwers/stockpilers

The Walinga grain vacuuums can also load into trucks with a

moveable spout to reduce dust and time required for loading.

The systems can be trailer mounted and are easy to repair with minimal tools.

leon ■

In Ras Al Khaimah, possibly similar climate, they used to pile the clinker and just spray it with water pumped right out of the Persian Gulf. A crust quickly formed and kept the ensilement totally safe. If you compare the cost of a steel shed to the cost of the cement skin then its probably not dumb enough after all.

I couldn't believe it when I saw it but the fact is it worked very well in the hot dry climate. Since then the locality has made a pile of money out of the Dubai building boom, gone all progressive and invested in a huge geodome. Maybe that is the really dumb part. ■

Whenever I think of temporary flat storage I always think of big front end loaders.

Fitted with a blade on a pole to push material up into a big pile, fitted with a big bucket to reclaim the stuff. The delivery trucks tip close to the pile and reclaiming trucks position close to the pile so the there's not too much running around for the front end loader.

Hire it in when you need it, send it back when you don't ■

James,

You should speak with B&W Mechanical Handling Ltd. in the UK.

www.bwmech.co.uk

They have a mobile radial boom stacker that do what you are looking for.

If you need any further support please reply. ■

Hello,

As you have mentioned you are open to varied options. This has relevance to storage capacity, blending requirement if any, and money to be invested in plant. You will be tackling about the system choice accordingly. Some information is as below:

Routine arrangement is overhead tripper conveyor, installed in sloping shed steel silo. The external ground level reclaim conveyor with hopper is fed by payloader at 2 - 3 points. The reclaim hopper and payloader movement will be covered by annex enclosure. The conveyor will be totally enclosed. This will give reliable protection against rain. Steel silo storage will have long life, and do not need any attention.

To reduce dusting during stacking, it should begin stacking on face of full height stockpile, and tripper moves step by step advancement, so that material free fall is always limited to say 2.5 m.

Clinker is sluggish material to flow, so do not make very tall stockpile when reclaiming is by payloader.

Such arrangement has small benefit about blending of material. The system is easily available from many sources.

As for systems using portal scraper, etc., their performance will be neat, clean, with blending, etc., but at a price.

Regards,

Ishwar G. Mulani

Author of Book: Engineering Science And Application Design For Belt Conveyors (new print November, 2012)

Author of Book: Belt Feeder Design And Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Pune, India.

Tel.: 0091 (0)20 25871916

Email: conveyor.ishwar.mulani@gmail.com

Website: www.conveyor.ishwarmulani.com ■

Who's struck the rock.

After 5 years in the wilderness this is better never than late.

The guy was asking for something cheap and nasty and when he got answers he shut up shop. ■