Processing

processing machinery

When the tin ore was found underground, it did not occur in big pieces, but in small crystals scattered through the rock.

Once the rock has been mined underground it was hoisted to the surface where it needed to be processed to become a tin concentrate – a fine powder know as ‘black tin’. This would be taken away to be smelted into the tin metal that we are familiar with.

 

 Photograph reproduced with the kind permission of the T Grevatt collection held by Cornwall Council

 

Grinding

Click to see a larger version of this imagepile of balls for grinding in the ball mill

Grinding reduced the tin ore into much finer particles- about the size of grains of sand.


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Smelting

Click to see a larger version of this imagemolten tin

The process of smelting changes tin ore into metal.


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Brunton Calciner

Click to see a larger version of this imagedrawing of the interior of a brunton calciner

In the 1830s the Brunton Calciner was developed for arsenic recovery, which were used many Cornish mines until the 1950s.


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Sorting

Click to see a larger version of this imagemill worker working on the picking belt in the Mill

Once the ore has been crushed it would first be washed and then sorted. 


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Comment left by stephanie murrietta on 2009-10-12 19:01:25

you made to good on my project

Comment left by p.srinivas on 2010-12-20 14:45:27

very good article,plz pass to me

 

Comment left by selllyy on 2011-05-17 12:58:12

this was really great

 

Comment left by kran balka on 2011-07-30 18:17:28

Thank you very much for that dazzling article

 

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