The Manufacture of a Porous Magnetic Ferric Oxide Filtering Medium.
Year: 1892

page_text: Date of Application, 21st May, 1892
Complete Specification Left, 25th June, 1892-Accepted, 24th Sept., 1892
PROVISIONAL SPECIFICATION.
The Manufacture of a Porous Magnetic Ferric Oxide Filtering
Medium.
I CHARLES HENRY GARNET HARVEY Sanitary Engineer of 29 Lorn Road
Brixton in the County of London do hereby declare the nature of this invention to
be as follows:-
This invention has for its object the manufacture of a porous magnetic ferric
oxide filtering medium from iron ores more particularly carbonates of iron and other
analogous ores and in the apparatus employed therefor.
For this purpose I apply heat to the ore in the manner and in the apparatus
hereafter to be explained.
In carrying out my invention I use a kiln or oven constructed of fire brick or
other suitable material with an outer shell of ordinary brick, bound together with
wrought iron bands, and having four apertures at the base at equal distances apart
for the purpose of admitting air (and also for drawing the ore when treated) the
supply being regulated by dampers.
The fuel I prefer to use is charcoal, wood or peat, but other fuels not containing an
abnormal quantity of sulphur may be found suitable.
The kiln or oven when charged with the ore to be treated. is fired and an
average temperature of about 800 (Far.) maintained (or such temperature as may
be found necessary) for 12 hours, or until such time as the whole of the carbonic
acid of the ore is converted into carbonic acid gas and driven off.
When this process is completed the ore is converted into a porous magnetic
ferric oxide which is an efficient filtering medium, inasmuch as all organic matter
coming in contact with it is converted into carbonic acid by the oxidising action of
the filter.
Dated this 21st day of May 1892.
CHARLES HENRY GARNET HARVEY.
COMPLETE SPECIFICATION.
The Manufacture of a Porous Magnetic Ferric Oxide Filtering
Medium.
I, CHARLES HENRY GARNET HARVEY Sanitary Engineer of 29 Lorn Road
Brixton in the County of London 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 :—
This invention has for its object the manufacture of a porous magnetic ferric
oxide filtering medium from iron ores more particularly carbonates of iron and other
analogous ores and in the apparatus employed therefor.
For this purpose I apply heat to the ore in the manner and in the apparatus
hereafter to be explained.
In carrying out my invention I use a kiln or oven constructed of fire brick or
other suitable material with an outer shell of ordinary brick bound together with
wrought iron bands, and having 4 or more apertures at the base at equal
distances apart for the purpose of admitting air (and also for drawing the ore when
treated) the supply being regulated by dampers.
The fuels I prefer to use are charcoal, wood or peat but other fuels not containing
an abnormal quantity of sulphur may be found suitable. The kiln or oven when
charged with the ore to be treated is fired and an average temperature of about 800 to

page_text: .
1200 Fahrenheit maintained (or such temperature as may be found necessary) for
12 hours or until such time as the whole of the carbonic acid of the ore is converted
into carbonic acid gas and driven off.
When this process is completed, the ore is converted into a porous ferric and
magnetic oxide, which is an efficient filtering medium, inasmuch as all organic
matter containing carbon, coming in contact with it is converted by oxidation in
carbonic acid and any nitrogen into free ammonia. The annexed drawing of a kiln
or oven illustrates the before-mentioned invention for the treatment of iron ores,
both on the sectional and ground plans, the outer shell of ordinary brick is
marked "B" the inner shell of fire brick or other suitable material is marked "A,"
the wrought iron bands binding together the kiln or oven are denoted by "C," the
apertures at the base of the kiln for the purpose of admitting air (the supply being
regulated by dampers) and also for charging with and drawing the ore when treated
are marked "D," the flue for conveying away the carbonic acid evolved from the
ore and other organic bodies present is marked "E."
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The manufacture of a porous magnetic ferric oxide filtering medium from iron
ores more particularly carbonates and other analogous ores and in the apparatus
employed therefor substantially as herein set forth and shown in the accompanying
drawing.
Dated this 25th day of June 1892.
CHARLES HENRY GARNET HARVEY.