IMPROVEMENTS IN PROCESSES AND APPARATUS FOR OBTAINING USEFUL PRODUCTS IN THE TREATMENT OF GALVANIZERS FLUX AND OTHER MATTERS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Hartley Kenyon at the Office of the.
'Commissioners of Patents on the 17th May 1883.
10 "
****... *17).
HARTLEY KENYON of Altrincham in the County of Chester, Manufacturing
Chemist, IMPROVEMENTS IN PROCESSES AND APPARATUS FOR OBTAINING USEFUL
PRODUCTS IN THE TREATMENT OF GALVANIZERS FLUX AND OTHER MATTERS"
.
My Invention has for its principal object to utilise galvanizers flux and dross
and similar matters and thereby to obtain zinc paint and other useful products. I
treat the flux in the following manner. The flux is ground or disintegrated and
sieved and is then placed in vats into which are run the washing waters resulting
from previous operations. The resulting liquor I will term crude ammonia zinc liquor.
The insoluble residuum is drained and dried and placed in cisterns in which the
zinc and iron are dissolved by means of hydrochloric acid. In some cases the
flocculent carbon is removed by means of a flint filter. The filtered liquor I will
term impure zinc liquor from which I obtain pure chloride of zinc liquor. In some.
cases I use the liquor without filtration. In the manufacture of sulphide of zinc I
may utilise soda-makers vat-waste or gas-lime but I prefer to specially prepare a
sulphide of calcium free from carbonate and hydrate. of calcium. I treat salt cake,
mud-lime from caustic soda filters in equivalents with an excess of carbon in a
reverberatory furnace whereby I obtain carbonate of soda and sulphide of calcium
without the presence of free lime. I wash the resultant to remove the carbonate
of soda and obtain nearly pure sulphide of calcium. In another method I place
vat-waste with an equivalent of salt cake and an excess of carbon in the furnace
and obtain a similar product. I prepare a chloride of ammonium by treating a
portion of the said ammonia zinc liquor with an equivalent of soda liquor obtained
from the washings. The resultant carbonate of zinc is removed by precipitation
chlorides of sodium and ammonium being present in solution. I prepare sulphide
of ammonium by placing in a still the chloride of ammonium obtained as aforesaid
or as hereinafter mentioned in company with an excess of vat-waste or of the said
sulphide of calcium the latter being preferred. I charge a receiver with the
aforesaid pure chloride of zinc liquor. I obtain pure sulphide of zinc and chloride
of ammonium and I remove the latter by washing or roasting or by suitable means.

page_text: I may substitute the said crude ammonia zinc liquor or zinc liquor obtained
otherwise than as herein indicated. for the said chloride of zinc liquor but the
resulting sulphide of zinc may not be so pure. I recover spelter and lead from
dross in the following manner. The dross is spread upon the floor of a roasting
furnace which is heated by means of gas from a gas producer or by means of coke
or by suitable means. The said floor is slightly concave or slopes from each side
to the centre and also from the front to the back. At the back end is a collecting
pot, chamber or receptacle into which the metals run. The spelter is skimmed or
removed from the top and the dross is removed leaving the lead. The dross is
returned to the furnace. The gas producer is supplied with Arly or Forrest of Dean
coal or with a coal rich in nitrogen and hydrogen and superheated steam is injected
into the producer alone or in company with air or heated air. I also inject the
said flocculent carbon and a solution of chloride of zinc which may be a resultant
of my process into the gas producer. The gas is passed into a chamber in which is
deposited oxide of zinc and is then passed into a washer to remove ammonia. I
prefer to have two chambers to be used alternately. Previously to the producer
being charged I stop the injection of chloride of zinc-if it is important to prevent
the fumes from being a nuisance-and-discharge the said chloride into the gas
conduit. From the gas washer I obtain chloride of ammonium. The gas is mixed
with air as it is introduced into the furnace the air being heated by preference. I
also use the gas in place of fuel in other operations. The products of combustion
and the matters carried over from the furnace are passed into a depositing chamber
through which they are compelled by means of partitions to take a circuitous
course. Oxide of zinc is deposited. I prefer to use a Körting injector or other
apparatus to draw the said products and matter from the furnace and through the
said depositing chamber and to deliver them below the surface of water in order to
arrest any undeposited oxide. For drying the sulphide I prefer to use a revolving
furnace or a tiled furnace provided with a sloping bed heated by gas. I also use
the sulphide of Ammonium to precipitate sulphide of barium from the chloride-