Improved Process or Treatment of Waste Materials Obtained in the Manufacture of Ammonium Compounds to Produce a Substance suitable for Use as a Paper Filling in the Manufacture of Paper.
Year: 1895

page_text: Date of Application, 3rd Oct., 1895
Complete Specification Left, 24th June, 1896-Accepted, 25th July, 1896
PROVISIONAL SPECIFICATION.
Improved Process or Treatment of Waste Materials Obtained in the
Manufacture of Ammonium Compounds to Produce a Substance
suitable for Use as a Paper Filling in the Manufacture of
Paper.
I, WILLIAM BROTHERS, of Higher Clews Chemical Works, Rawtenstall, in
County of Lancaster, Manufacturing Chemist, do hereby declare the nature of this
invention to be as follows:-
:-
The invention has reference to an improved process or treatment of certain
waste materials obtained in the manufacture of ammonium compounds or say
materials containing carbonate of lime sulphate of lime and hydrate of lime, to
produce a substance or material suitable for use as a paper filling or loading in the
manufacture of paper.
It consists essentially in treating the waste material with carbonic acid gas to
convert all the hydrate of lime in the waste material into precipitated chalk by
which action a neutral compound of sulphate of lime and precipitated chalk is
produced which will be found a suitable substance for use as a paper filling.
In carrying out the invention I take a quantity of waste material say such as is
produced in the manufacture of ammonium compounds by the action of slaked
lime on sulphate of ammonia and this I treat with carbonic acid gas in a suitable
receptacle or container to convert all the hydrate of lime into precipitated chalk.
By this treatment a neutral compound of sulphate of lime and precipitated chalk
is formed which may be employed in any ordinary or suitable manner as a paper
filling in the manufacture of paper.
Dated this 2nd day of October 1895.
W. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.
COMPLETE SPECIFICATION.
Improved Process or Treatment of Waste Materials Obtained in the
Manufacture of Ammonium Compounds to Produce a Substance
suitable for Use as a Paper Filling in the Manufacture of
Paper.
I, WILLIAM BROTHERS, of Higher Clews Chemical Works, Rawtenstall, in
the County of Lancaster, Manufacturing Chemist, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
The invention has reference to an improved process or treatment of certain waste
materials obtained in the manufacture of ammonium compounds or say materials
containing carbonate of lime sulphate of lime and hydrate of lime, to produce a
substance or material suitable for use as a paper filling or loading in the manufacture
of paper.

page_text: It consists essentially in treating the waste material with carbonic acid gas to
convert all the hydrate of lime in the waste material into precipitated chalk by
which action a neutral compound of sulphate of lime and precipitated chalk is
produced which will be found a suitable substance for use as a paper filling.
In carrying out the invention I take a quantity of waste material say such as is
produced in the manufacture of ammonium compounds by the action of slaked
lime on sulphate of ammonia this is reduced to a liquid state by the addition of
water in which it is kept suspended by agitation or otherwise. Into this liquid
I blow furnace gas containing carbonic acid (CO2) until all the free or hydrated
lime therein is converted into carbonate of lime or precipitated chalk.
The waste material contains approximately about 20% of hydrate of lime and
by forcing furnace gas containing about 20% of carbonic acid gas (CO2) into the
material while it is kept in a state of agitation by a dasher the operation occupies
about 6 hours.
A longer or shorter time may be occupied according to the quantity of material
under operation. It must be continued until the mixture is completely neutral
when tested with litmus.
By this process a neutral compound of sulphate of lime and precipitated chalk
is formed which may be employed in any ordinary or suitable manner as a paper
filling in the manufacture of paper, or for any other purpose for which it may be
found suitable.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is,
The process for producing a substance suitable for use as a paper filling which
consists in treating waste products such as described containing hydrate of lime by
blowing therethrough gases containing a quantity of carbonic acid gas until all the
lime is converted into carbonate substantially as described.
Dated this 10th day of Lune 1896
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.