Base metal removal

[Yggdrasil]

Wouldnt it just cement out once its saturated with iron? Next batch perhaps?

As long as the Iron is in metallic state yes.

 

[jphayesjr]

In minerals, iron is found as oxides or sulphides eventually, it is difficult to explain how he reduced the iron to metallic, if the iron in the final alloy comes from the ore, since temperatures of the order of 1500 degrees Celsius are required. and very reducing conditions in the molten bath. An alternative, as mentioned, is the fusion of the bar and the blowing of the molten material with pressurized air, forming a fine shot that is leachable with hot hydrochloric or sulfuric acid and with agitation.

Edited by Moderator to get the posters text out of the quote

 

[jphayesjr]

Iron telluride is also a ferrous mineral.

 

[g_axelsson]

Since we don't know what percentage of different metals there are in the bar it's hard to give good advice. 1,2% silver in iron is a whole different story as 1,2% pgm. Depending on the relative amount of precious metals it would make sense to go after metals in different order.

One thing I've always wanted to test but hasn't done it myself is to use liquid - liquid extraction of gold from iron. Melt a sample with silver as a collector metal. Silver shouldn't alloy with the iron and create a separate phase. It needs mixing for a while to let the gold (or maybe other precious metals) to be absorbed in the silver phase.
At least for gold the affinity for dissolving in silver is a whole lot higher than in iron.

Göran

 

[Yggdrasil]

Since we don't know what percentage of different metals there are in the bar it's hard to give good advice. 1,2% silver in iron is a whole different story as 1,2% pgm. Depending on the relative amount of precious metals it would make sense to go after metals in different order.

One thing I've always wanted to test but hasn't done it myself is to use liquid - liquid extraction of gold from iron. Melt a sample with silver as a collector metal. Silver shouldn't alloy with the iron and create a separate phase. It needs mixing for a while to let the gold (or maybe other precious metals) to be absorbed in the silver phase.
At least for gold the affinity for dissolving in silver is a whole lot higher than in iron.

Göran

Nice to see you again

 

[Mr.Rhodium]

Since we don't know what percentage of different metals there are in the bar it's hard to give good advice. 1,2% silver in iron is a whole different story as 1,2% pgm. Depending on the relative amount of precious metals it would make sense to go after metals in different order.

One thing I've always wanted to test but hasn't done it myself is to use liquid - liquid extraction of gold from iron. Melt a sample with silver as a collector metal. Silver shouldn't alloy with the iron and create a separate phase. It needs mixing for a while to let the gold (or maybe other precious metals) to be absorbed in the silver phase.
At least for gold the affinity for dissolving in silver is a whole lot higher than in iron.

Göran

Thank you Göran,
It is about 1,1% PMGs and Au and 0,1% silver.
I tried before 2 other method of smelting-

1. Silver collector- was nice and cleaner, but harder to separate the some PGMs because some went to nitric.
At the end I got a powder of of it with mixed precious metals but not all of them.
I got 0,2% in hand of them excluding the silver.

2. I used iron powder as collector, It collected mostly Au and Ir but it was extremely hard to separate.

Those test have been dome before testing it with no collector which I found the fasted and easiest way to extract from the ore.

At this stage I know my best option are with Cu as collector or without any collector.

I will try electroplating with one of those-
solution of sulfuric acid and water, as it can effectively dissolve the iron while leaving the precious metals unaffected.
Alternatively, a solution of sodium chloride can be used as an electrolyte.

 

[Lino1406]

Thank you Göran,
It is about 1,1% PMGs and Au and 0,1% silver.
I tried before 2 other method of smelting-

1. Silver collector- was nice and cleaner, but harder to separate the some PGMs because some went to nitric.
At the end I got a powder of of it with mixed precious metals but not all of them.
I got 0,2% in hand of them excluding the silver.

2. I used iron powder as collector, It collected mostly Au and Ir but it was extremely hard to separate.

Those test have been dome before testing it with no collector which I found the fasted and easiest way to extract from the ore.

At this stage I know my best option are with Cu as collector or without any collector.

I will try electroplating with one of those-
solution of sulfuric acid and water, as it can effectively dissolve the iron while leaving the precious metals unaffected.
Alternatively, a solution of sodium chloride can be used as an electrolyte.

Also aluminum combines with most precious metals, and it dissolves in alkali

 

[Yggdrasil]

Also aluminum combines with most precious metals, and it dissolves in alkali

Hmm, you say with most.
Interesting.
Which ones do not combine well with Al?

 

[Lino1406]

Also aluminum combines with most precious metals, and it dissolves in alkali

All of them combine, but iron too

 

[Yggdrasil]

All of them combine, but iron too

Too bad, then Silver may be a better solution.

 

[Lino1406]

Too bad, then Silver may be a better solution.

I am not sure if rhodium, iridium dissolve in silver. Maybe in such concentrations. Silver also looks too expensive

 

[Yggdrasil]

I am not sure if rhodium, iridium dissolve in silver. Maybe in such concentrations. Silver also looks too expensive

Lou told it was not ideal as collector for Rhodium, but Iron and Silver do not mix well, which is interesting in this setting.
The Silver will collect the Gold which on the other hand is an excellent collector for Rhodium,if it will carry it into the Silver is another question.
It could be an interesting thing to test though.