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MINING-HISTORY  May 2008

MINING-HISTORY May 2008

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Subject:

Re: Reverberatory calciner

From:

"NEWMAN, Phil" <[log in to unmask]>

Reply-To:

The mining-history list.

Date:

Tue, 27 May 2008 22:36:40 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (47 lines)

Hi Tom,

There's an account of The Burning House, with illustrations, in:

Henderson, J 1858 'Methods of Tin and Copper Dressing in Cornwall' Proc Inst Civil Engineers, Vol 17, 195-220. The one illustrated is of very similar layout to those at Atlas and Little Gem. 

Lynne Mayers produced a  booklet version of this paper a couple of years ago; she may still have copies.

A little earlier, Henwood (1832) provided the following description of the operation of roasting in a similar structure, also described. 

'The furnace being raised to a dull red heat, about seven cwt of ore is put into it, through a hole in the top: if it were roughly stirred at once, the rapid evaporation of the moisture, contained in it, would probably dissipate a portion of the ore: it is therefore, allowed to remain unmoved for about an hour, in order to [allow?] the gentle evaporation of the water: it is then spread over the furnace for about four feet in length, nearest the fire; and, by means of an iron rake, it is turned every half-hour or oftener, that the whole may be equally exposed to the action of the fire. This continues until it ceases to give out whitish fumes; it is then turned, to exhibit bright sparkles; it is then withdrawn through a hole now uncovered in the bottom of the furnace, and allowed to cool'. For full description see Henwood, W J 1832 Roy Geol. Soc Cornwall, Vol 4, 153.

Perhaps the best illustration is in: Scoffern, J 1857 The Useful Metals and Their Alloys (London)Which is available on the internet but is a huge unmanageable 35mb PDF file. 

I have copies of all of these if you need them in a hurry. 

All the best

Phil Newman





-----Original Message-----
From: mining-history on behalf of Tom Greeves
Sent: Sat 24/05/2008 20:21
To: [log in to unmask]
Subject: Reverberatory calciner
 
Does anyone know of a mid- to late 19th century account of the operation of a brick built REVERBERATORY CALCINER for roasting tin or other ores? This is something different from a BRUNTON calciner.

Dr Tom Greeves, MA PhD
39 Bannawell Street, Tavistock
Devon PL19 0DN
(tel: 01822 617004)
www.tomgreeves.org

 


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