File and polish ores from cobalt

jagetype off to a rocking start Member since July 2013 Posts: 12	File and polish ores from cobalt Jul 16, 2013 17:59:31 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jagetype on Jul 16, 2013 17:59:31 GMT -5 I will Dilute the Acid with 50% water nex time, I have some tiny nuggets that are more Pure to try Thanks

vegasjames
no longer being taken for granite

Member since June 2013
Posts: 9,558

File and polish ores from cobalt Jul 16, 2013 18:24:18 GMT -5

Quote

Post by vegasjames on Jul 16, 2013 18:24:18 GMT -5

Jul 16, 2013 8:57:59 GMT -5 sheldon74 said:

Muriatic acid has no effect on silver or nickel.

Yes it does on both.

The reason muriatic acid (hydrochloric acid) is commonly used in nickel testing of potential meteorites is because the dilute acid dissolves some of the nickel creating nickle (II) and nickle (III) chlorides that can then react tested for with dimethylglyoxime.

Hydrochloric acid reacts with silver forming silver chloride. It is not a strong reaction, but it does occur which can pit the metal or dissolve it completely given time.

This is why I asked in my earlier post why he would want to treat the ore with hydrochloric acid. It can destroy the natural beauty of the stone.

I use concentrated hydrochloric acid all the time to clean caliche off stones, to expose crinoid fossils, etc. But you have to know what the acid will and will not react with and watch the stones carefully with short, repeated baths to prevent destroying the stones.

Deleted Deleted Member Member since January 1970 Posts: 0	File and polish ores from cobalt Jul 17, 2013 12:01:08 GMT -5 sheldon74 likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Deleted on Jul 17, 2013 12:01:08 GMT -5 jagetype, thanks for making this thread. I am enjoying it a lot. I hope you keep posting new pics and what you learn along the way.

barclay has rocks in the head Lowly Padawan of rocks Member since November 2011 Posts: 510	File and polish ores from cobalt Jul 19, 2013 19:07:48 GMT -5 sheldon74 likes this Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by barclay on Jul 19, 2013 19:07:48 GMT -5 If you are dry sanding heavy metal ores like nickel remember respiratory protection. You never know what you are breathing or what is in the dust you take in your home.
	To seek out new rocks, new civilizations. To boldly go where other people have found cool rocks!

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