IMPROVEMENTS IN PROCESSES FOR THE UTILISATION OF GALVANIZERS FLUX AND OTHER MATTERS IN THE MANUFACTURE OF ZINC PAINT AND OTHER PRODUCTS
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by Hartley Kenyon at the Office of the
Commissioners of Patents on the 19th August 1882.
HARTLEY KENYON of Altrincham in the County of Chester, Manufacturing
Chemist, "IMPROVEMENTS IN PROCESSES FOR THE UTILISATION OF GALVANIZERS
FLUX AND OTHER MATTERS IN THE MANUFACTURE OF ZINC PAINT AND OTHER
PRODUCTS
37
My Invention has for its principal object to utilise galvanizers flux, gas iron, and
sawdust manure in the obtainment of useful products and bye-products. I charge
the said flux on the floor of a roasting furnace of a suitable construction. I prefer
to use a furnace having a long slanting floor say about fifty feet long heated by
sub-flues and a crown also heated by flues the depth of the furnace from floor to
crown varying from nine to fifteen inches. The flux may or may not be ground or
crushed and lixiviated before being charged into the roaster. To aid in tbe
operation I burn in the roaster sulphuretted hydrogen or the gas obtained by
distilling slack coal or both gases and I also admit highly heated air which has
been passed through the bridges and parts which require to be cooled. The air is
deoxidised and the liberated nitrogen combining with hydrogen forms ammonia.
I somtimes add ground coke or sawdust manure to the charge in the furnace to
assist the operation and to regulate the flow of the charge down the inclined bed.
I obtain sulphuretted hydrogen from gas iron. I wash to remove soluble matters
and heat in a furnace adding iron if necessary. From the sulphide thus produced I
obtain sulphuretted hydrogen by treatment with acid. I calcine sawdust manure
in a suitable retort and volatilise the ammonia, pyroligneous acid, and naptha and
collect the ammonia in vitriol. The refined acid and naptha being freed from tarry
matters are easily separated. By passing the impure sulphate of ammonia through
vat waste and steam' I obtain sulphide of ammonium. The residual sulphate of
lime is available as a deodarant for excreta. The chlorides of ammonium and zinc
are volatilised and are delivered into an absorber which may consist of a long
cylindrical chamber through which passes a shaft carrying agitators. I charge
this absorber with solutions of sulphide of ammonium, sodium or calcium.
Price 577
The

page_text: solution is brought into contact with the fumes by means of the revolving agitator
and is also discharged into the absorber in the form of spray. When I wish to
obtain spelter I withdraw the charge from the roaster when the chlorides have
been driven over but when I wish to obtain a larger proportion of zinc compounds
I continue the roasting until the zinc has passed over into the absorber. The said
agitator is formed to propel the zinc deposit towards the discharge end of the
absorber the said deposit being washed and treated to render it suitable for use in
From the said absorber I also obtain
the manufacture of paint or for other uses.
chlorides of ammonium, sodium or calcium or double salts according to the
sulphides employed-To obtain the sulphide of sodium for use in the absorber I
charge a roasting chamber with salt cake to which is added a suitable amount of
coal slack to reduce the sulphate into sulphide. To produce the sulphide of
ammonium I combine carbonate of ammonia with an equivalent of sulphide
of sodium and pass over the sulphide of ammonium the resultant being carbonate
of soda.
To obtain carbonic acid and other gases used as aforesaid I heat vat waste in a
suitable chamber or vessel in company with an equivalent of sulphuric acid.
Sulphuretted hydrogen and carbonic oxide are given off and are conveyed into the
roaster. To the residium I add slack coal sufficient to de-oxidise and to liberate
carbonic acid. From the resultant sulphuretted hydrogen can be again obtained
by treatment with sulphuric acid. To produce chloride of zinc I heat the zinc
deposit from the absorber in a still with hydrochloric acid when sulphuretted
From the resultant chloride of zinc
hydrogen is given off and is used as aforesaid.
I obtain a sulphide of zinc by freeing the chloride from iron and treating with
sulphide of sodium or calcium
From the chloride of ammonium obtained from the absorber I obtain by reaction
carbonate of soda. I charge a still with the chloride of ammonium and decompose
with lime. I then convey into the resultant carbonic acid which may be obtained
from the aforesaid treatment of salt cake, whereby I obtain carbonate of ammonia.
I charge an absorber with sulphide of sodium and force in the carbonate of
ammonia and by re-action I obtain sulphide of ammonium which I can pass into
the absorber to precipitate the zinc, carbonate of soda being left in solution.
I work the whole of my Invention in combination or parts of it separately.