How to Restore Big Granular Compound to Powder

If your "..powder-like chemical compound..." is hydraulic cement, it will be difficult to unring the bell.

Seriously, it does rather depend on what the powder is. There are certain techniques one wouldn't use with ammonium nitrate, for example.

Why original postings don't give details of the materials, temperatures, pressures and quantities involved is quite abstruse.

and/or

Then see post # 1 if necessary.

Only heating or dehumidifying can break it into powder?

WTF is this powder? Sheesh.

If a powder absorbs moisture it changes the physical (and sometimes chemical) properties of the material. There is often a significant change in crystalline structure etc. If you want to restore it to what it was before as requested in post title, yes. If you just want to grind it up then you can do so.

As others have said it depends on the powder.

Please tell us what the chemical powder is otherwise we are guessing, or at worse offering a solution that could cause the powder to explode.

Different chemical compounds to prepare hydroponic solution.

Some of such compounds can absorb moisture quite easily.

Ken, this is hardly not useful information.

How can we be friends if you keep secrets from us?

As a preventative measure you can apply an inert gas purge to the hoppers and other process equipment. Very common for nitrogen to be used as a blanket to drive-off moisture.

OK, so mineral nutrients used to grow plants without the use of soil. That helps narrow things down.

Well these are unlikely to be hazardous (ie- explode due to the application of heat, pressure or when aerated).

You could simple vacuum seal the open bulk bags to prevent moisture in the air (humidity) causing the minerals to clump together and try a little heat and movement to dry out small amounts of the damp minerals (perhaps a hairdryer and a course sieve).

Hydroponic solutions may contain salts that can make pretty powerful explosives. Dissolve the clumped salt in hot water until it is saturated, determine the concentration at saturation, and add the required aliquot when making your working solution. Simple GREENHOUSE 101 solution.

I had experienced a horrible chemical reaction between two common hydroponic compounds:

3CaCl2 + 2H3PO4 -----> Ca3 (PO4)2 + 6Hcl(vapor form)

Fortunately my apartment has a yard and I did it outside.

I got this equation on internet after I had observed the toxic fume!

When did CaCl2 become a hydroponic compound? I use Ca(NO3)2 or CaSO4 depending on the Nitrogen/Sulphur requirement of the crop. Chloride ion gets toxic to many plants at fairly low concentration.

but Cl ion is essential for plant!

http://www.tetrachemicals.com/Products/Agriculture/Chloride_-_An_Essential_Element.aqf

but Cl ion is essential for plant!

True, I use (NH4)Cl or KCl for that.

Questions about soil, grow lights, indoor hydroponics and now a mysterious powder, enough to make you go hmmm?

I think you may have already absorbed some of this, "powder-like chemical compound" into your system, and it has affected you adversely.

Tell us what the, "powder-like chemical compound" is.

I like pounding the crap outta it with the big hammer, per PWSlack! Then, if it does blow up, if it's strong enough........................................................,,,,,,,,,,,//////////////

Yep. If it's strong enough, end of problem.

You can start here: http://www.bulk-online.com/Cat/905.htm

Send it back to manufacture for reprocessing. If they won't touch, nor should I as the rule goes.