METALLIC VAPOURS,. COMPOUNDS OF METALS, SULPHUR DIOXIDE, OR OTHER VAPOURS FROM THE CHIMNEYS AND FLUES OF CHEMICAL, METALLURGICAL OR OTHER WORKS
Year: 1884

page_text: ERNEST HENRY COOK Trade and Mining School Nelson Street Bristol, Analytical
Chemist, do hereby declare the nature of my invention for PREVENTING THE
EMISSION OF METALLIC VAPOURS,. COMPOUNDS OF METALS, SULPHUR DIOXIDE, OR
OTHER VAPOURS FROM THE CHIMNEYS AND FLUES OF CHEMICAL, METALLURGICAL
OR OTHER WORKS, to be as follows:-
The vapours and gases are made to pass in their passage to the stack through
flues where they are brought into contact with sulphuretted hydrogen, either in the
form of gas or in solution in water or in any other form; or with alkaline or other
sulphides or mixtures of them with each other or with sulphuretted hydrogen.
The substance which will be most extensively used as the source of these sulphur
compounds will be that known as "alkali maker's waste." Steam, or a mixture of
steam and air will be blown through a mixture of alkali waste and water and the
mixed gases thus obtained passed into the flues. The sulphuretted hydrogen will
also in some cases be produced by the action of acids upon this waste.
The following chemical change will occur between the sulphurdioxide and the
sulphuretted hydrogen;
S + SO₂ = 2 H₂O + S,
2 H₂
2
The changes which will occur in the other cases will depend upon the works to
which the invention is applied. In the case of Lead works they will be as
(1) Pb + SH. = Pb S + H₁
(2) PbO+SH.:
= Pb S + H, O
(3.) Pb SO, + 3 SH₁ = Pb S + 3 H, O + S,

page_text: ERNEST HENRY COOK Trade and Mining School, Nelson Street, Bristol Analytical
Chemist do hereby declare the nature of my invention for PREVENTING THE
EMISSION OF METALLIC VAPOURS COMPOUNDS OF METALS, SULPHUR DIOXIDE, OR
OTHER VAPOURS FROM THE CHIMNEYS AND FLUES OF CHEMICAL METALLURGICAL
OR OTHER WORKS and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement:-
The invention consists in the use of sulphuretted hydrogen, alkaline sulphides,
and mixtures of these with each other for preventing the vapours given off from
furnaces used for bringing about chemical changes leaving the stacks and thus
getting into the open air.
The mode in which this is effected is to cause the above substance or substances
to come into contact with the exhalations from the furnaces in the flues, chambers,
or passages leading to the stacks or place or places of exit for the gases or vapours
into the atmosphere.
The sulphur compounds are produced from the substance known as " alkali-
maker's waste" which is produced in large quantities in works where carbonate of
sodium is made by what is known as Leblanc's process.
"
The modes of treating this "waste in order to utilize the sulphur compounds
which it contains are as follows:-
1st The substance being placed in a suitable vessel or receptacle and moistened
with water; air or steam either singly or together is blown through the mass.
This air or steam or both enters the vessel at one opening, becomes charged with
sulphur compounds, i.e. sulphuretted hydrogen, alkaline sulphides, or mixtures of
these, and leaves at a second opening which is in communication with the flues,
chambers or passages leading to the stack or stacks or exit or exits. In these
flues, chambers or passages the air or steam or both thus charged comes into contact
with the gases or vapours given off from the furnaces, and chemical changes occur:
These result in the deposition of the metal or metals present, combined for the most
part with sulphur; and also in the decomposition of the sulphur dioxide, sulphur
being deposited.
2nd The waste having been mixed with water, cloths are steeped in it and these
are suspended in the flues &et, when similar chemical actions will occur as before.
3rd The waste is mixed with water and the gases and vapours from the furnaces
made to come into contact with this mixture.
In addition to these various modes of treating this substance any other mode
may also be employed the object being to bring its sulphur compounds into contact
with the vapours and gases from the furnaces.

page_text: The various chemical changes which will occur will depend upon the works to
which the invention is applied. In the case of lead works they will be as follows :-
TI
CUTT
C
TT
(2) IDU + >H₂ = F¢ Q + £₂ V.
(3.) PbSO, +3 SH, = PbS + 3 H₂O + S
(4.) SO, +2 SH₁ = 2 H, O + S
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is
1st The use of sulphur compounds of all or any kinds in preventing the emission
of metallic vapours, compounds of metals, sulphur dioxide or other vapours from
the chimneys and flues of chemical, metallurgical or other works.
(2) The use of the substance known as "alkali-maker's waste" as a source of
the-sulphur compounds used for these purposes.