Process for the Production of Building Stones and like articles.
Year: 1898

page_text: Date of Application, 17th Jan., 1898-Accepted, 26th Mar., 1898
Process for the Production of Building Stones and like articles.
I, PETER KLEBER, of 64, Trierer-Alleestrasse, Malstatt-Burbach, Rhine Province, in
the Kingdom of Prussia, Manufacturer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:—
The object of the present invention is the production of fire-proof building stones,
or stones of other shape, and the new process is as follows,-
The relative quantities used for the production of the required stones consist of
6 pounds of dried sand or similar material mixed with pound of calcined and
pulverised lime and then tempered with to 1 pound of hydro-chloric acid, the said
acid being previously diluted with 10 to 20 times its weight of water.
This raw material is piled up in small stacks about a yard in height for the purpose
of partial setting and cooling, and is left in these small stacks for a few hours.
After cooling, the mass which is still plastic is shaped or worked into the required
forms of the stones or like articles, and then placed in number on any suitable truck
or conveyance. These stones are then, while yet in this fresh and soft condition,
placed in tiers in a steam tight containing vessel, suitable man-boles being arranged so
that the stones may be wheeled in, in any quantity. The man holes are closed up
and the bricks are exposed to high pressure super-heated steam. This exposure after
the expiration of a few hours renders the stones sufficiently hard and permanent for
building purposes.
According to the required hardness of the stone, the articles are exposed for a
longer or shorter time to the high pressure super-heated steam, and for instance in
the case of paving stones or flags the exposure would be much longer than for
ordinary building stones. The cost of production referring to the ordinary kiln
fire-bricks when compared with bricks of the same size produced by this process
is in the first mentioned case from 13 to 14 shillings per thousand, whereas in the
new process it only amounts to from 6 to 7 shillings per thousand.
A second method of carrying the invention into effect is as follows,-The plastic
mass is formed of lime and sand in the same manner as that hereinbefore described
only without the addition of the hydro-chloric acid, and this plastic mass is allowed to
partially set for a few days before being treated as follows-The articles of the the
required shape are formed and then placed in a similar steam pressure boiler, but
instead of being treated only with super-heated steam, hydro-chloric acid vapour is
also present, this causes the articles to harden up in a similar manner to the first
process and also in this method the hardness can be varied according to the time of
exposure in the closed vessel. Stones or like articles produced by either of the two
processes when fully completed have a grain which cannot be distinguished by the
naked eye, and the structure has almost the appearance of smelting together of
metal.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the saine is to be performed, I declare that what
I claim is :-
Quaduation of firm neaof building stones or like articles

page_text: consisting of slaking or tempering a mixture of pulverised calcined lime and sand,
quartz, or the like, with dilute hydro-chloric acid, and subjecting the same when it is
formed and shaped into the required article to high pressure super-heated steam in a
vessel of suitable construction, all substantially as herein before described.
2, A process for the production of fire proof building stones or like articles con-
sisting of forming a plastic mass of a mixture of pulverised and calcined lime and sand
quartz or the like, and slaked or tempered with water, and then after partial setting
shaping or forming the required article, and then exposing in a vessel to a mixture of
super-heated steam and hydro-chloric acid vapour, all substantially as herein before
described.
Dated thin 17th day of Tanna 1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents.