This Site may help,

or this one

This company makes smaller dedusting equipment

Is the stuff at all magnetic? A good electromagnet might help if so. Somehow I doubt this would have been overlooked by the pros, but ya never know...

Techno had some good information and the people that wrote those regs have had experiences in the DR field. Some of the facts about dust in DR plants are: dust materials from feed circuits of course will be non-magnetic iron ore dust of less than 10 microns, mostly. Dust from the product side will be smaller and lighter and will contain some carbon along with reduced iron. It will also be explosive about the same as carbon dust in the same concentrations and it will re-oxidize in normal atmospheres, causing fires if left to accumalate and stack up. DR dust is mostly magnetic so can be picked up by magnets in an open area like roadways. This is being done in some cleanup methods of plants and vacuum trucks are used as well. Wash down may be used if it can be quickly saturated so the DR dust material is overwelmed by flooding.

It is very difficult to handle the DR dust after collection as it is all less than 8 microns with not many facets to allow briquetting without massive binder use unless you use a ram briquettor method (T.C.Inc. patent)

The only effective method of dust collection for DR dust has been a higher than normal design of increased velocity of air flow, to keep it in suspension or it will settle in pipes. You can install all collection ductwork in a vertical mode to keep the dust from settling. The settling dust will possibly re-oxidize in any pipe and again can cause fires.

It is also good to consider adding to any dust collection system or having available inert gas like nitrogen to keep the gas oxygen down below 13% if any problems exist with re-oxidation of the DR dust, & to prevent an explosive mixture. This inert gas should be available also for any collection tank or bin in handling DRI.

We have spent almost 40 years in DRI developement and handling. Any further comments or questions please contact us at T.C.Inc., USA, tele: 503-630-6759, email: tcinc002@aol.com