Improvements in the Method of and Apparatus for Obtaining Chemical Products by Utilizing Fluoride of Silicon.
Year: 1890

page_text: Date of Application, 14th Aug., 1890
Complete Specification Left, 26th Feb., 1891-Accepted, 16th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in the Method of and Apparatus for Obtaining
Chemical Products by Utilizing Fluoride of Silicon.
I HENRY BOWDITCH YARDLEY of 1. Denmark Terrace, Harvey Road,
Leytonstone, Essex, Analyst, Chemical and Electrical Engineer do hereby declare
the nature of this invention to be as follows:-
:-
The apparatus consists of a tank (A) having a perforated shelf near the top
and connected at the bottom by a pipe and valve or stopcock with a tank (B) at a
lower level, having its bottom in the form of a funnel, with a stopcock or valve at
or near the apex, passing into or nearly into, at the top another tank (C) of
similar form as respects its bottom. Below this may be a similar tank (D) and if
necessary other similar tanks, one below the other in series.
At the top of, and partly within, the tank (B) is fitted a horizontal revolving
wheel or wheels, with cover or covers having inlets and outlets for the passage of
gases, so constructed that its or their sides are within the tank (B) in such a
manner that the liquid filling or nearly filling the tank (B) will form a lute, closing
it or them from connection with the outer atmosphere.
The wheel or wheels being worked from the outside of the cover or covers by
suitable means.
The tanks C, D, &c. may be advantageously fitted with mechanical or other
agitators and each of the tanks B, C, D, &c. are connected with, in such a manner
that they may be emptied or filled by a pump or other machine for raising liquids,
and which is also made to discharge into the tank (A.).
The method of using the apparatus is as follows:-
A soluble salt-sulphate of soda as an illustration is placed upon the perforated
shelf within the tank (A) which is filled with water at starting.
When a
sufficiently strong solution is formed it is run into the tank (B) filling it so that
the revolving wheels (or wheels) is partly submerged and the cover luted. The
gases evolved in the manufacture of artificial manures, which contain fluoride of
silicon are made to pass through the cover of the revolving wheel.
Fluosilicate
of soda and separated silica are formed as a precipitate and settle towards the
apex of the tank (B) and when sufficient has settled, is let off into (C) where
it is stirred with water, allowed to settle and let off into (D) & so on. The
supernatant liquid which is left in (B, & C) is then pumped into the tank (A).
The wash waters from (D) are pumped into (C) and so on, the wash water from the
lower tank being returned to the next in series above and used for washing the
next lot of precipitate eventually being pumped from the tank (C) to the tank (A)
where it will take up more salt and goes through to (B) again. The liquid in the
tank (B) will thus at last take up no more of the salt and will be strongly acid.
It is then run out and utilised in any of the usual ways.
When Huosilicate of soda, or potash and silica, are the resulting precipitates
they are, after washing, mixed in the moist state, with a sufficiency of chalk or
lime, heated in a furnace to, or nearly to, fusion, drawn from the furnace and
lixiviated with water. The solution contains soda, or potash.
Tu hi tot 1 C Awoust 1800

page_text: .
COMPLETE SPECIFICATION.
Improvements in the Method of and Apparatus for Obtaining
Chemical Products by Utilizing Fluoride of Silicon.
I HENRY BOWDITCH YARDLEY of 1 Denmark Terrace, Harvey Road,
Leytonstone, Essex, Analyst, Chemical and Electrical Engineer 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 apparatus consists of a tank (A) having a perforated shelf near the top
and connected at the bottom by a valve or stopcock, with a tank (B) at a lower
level having its bottom preferably in the form of a funnel, with a valve or stop-
cock at or near the lowest point, passing into, at or close to, the top, another
tank (C) similarly fitted with a valve or stopcock at or near the lowest point.
Below this may be another similar tank (D) and if necessary other similar tanks
one below the other in series.
At the top of and partly within, the tank (B) is fitted a horizontal revolving
wheel (W), or wheels, with cover or covers, having inlets and outlets for the
passage of gases, so constructed that it or their sides are within the tank (B) in
such a manner that a liquid filling or nearly filling the tank (B) will form a lute
closing it or them from connection with the outer atmosphere. The wheel or
wheels being worked from the outside of the cover or covers by suitable means.
The tanks C, D &c. may be advantageously fitted with mechanical or other
agitators, and each of the tanks B. Č. D &c. are connected with, in such a
manner that they may be emptied or filled, by, a pump (P) or other machine for
raising liquids, and which is also made to discharge into the tank (A).
The method of using the apparatus is as follows:-
The soluble salt from which it is desired to obtain a fluosilicate, sulphate of
soda as an illustration, is placed upon the perforated shelf within the tank (A)
which is filled with water at starting. When a sufficiently strong solution is
formed, it is run into the tank (B) filling it so that the revolving wheel is, or
wheels are, partly submerged and the cover or covers luted.
The fluoride of silicon is, or gases containing fluoride of silicon, such as those
evolved in the manufacture of artificial manures, are, made to pass through the
cover or covers.
Fluosilicate of soda and separated silica are formed as a precipitate and settle to
the bottom of the tank (B) and when sufficient has settled is let off into (C) where
it is stirred with water, allowed to settle, and let off into (D) and so on. The
supernatant liquid which is left in (B & C) is then pumped into (A.), the wash
waters from (D) are pumped into (C) and so on, the wash waters from the
lower tank being returned to the next in series above and used for washing the
next lot of precipitate eventually being pumped from the tank (C) to the tank (A)
where it will take up more salt and goes through to (B) again. The liquid in
the tank (B) will thus at last take up no more of the salt and will be strongly
acid.
It is then run out and utilised in any of the usual ways. The further
tank (D &c.) may be dispensed with and the tank (C) alone used, by alternately
stirring the precipitate with water, allowing to settle, and pumping the supernatant
washings into the tank (A) eventually drawing the precipitate off at the bottom
of (C) when sufficiently clean.
1
When fluosilicate of soda, or potash, and silica, are the resulting precipitate, it
is after washing, mixed with a sufficiency of chalk or lime, dried, and heated in a
furnace to fusion, drawn from the furnace and lixiviated with water. The solution
contains soda or potash.

page_text: 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 combination of the revolving wheel or wheels and cover or covers and
the tank B & C, as & for the purpose described.
2. The combination of the tank A, the revolving wheel or wheels and cover or
covers, and the tanks B, & C, as and for the purpose described.
3. The mixing of the precipitate of fluosilicate of soda, or potash, and silica in
its moist state with chalk or lime and then drying and furnacing, &c.
Dated this 25th day of February 1891.
H. B. YARDLEY.