IMPROVEMENTS IN OBTAINING FROM NATIVE OR OTHER PHOSPHATE OF LIME PRODUCTS RICH IN PHOSPHORIC ACID
Year: 1884

page_text: I, EDWARD PACKARD, junior, of The Grove House, Bramford, near Ipswich, in
the County of Suffolk, Chemical Manufacturer do hereby declare the nature of my
invention for "IMPROVEMENTS IN OBTAINING FROM NATIVE OR OTHER PHOSPHATE
OF LIME PRODUCTS RICH IN PHOSPHORIC ACID," to be as follows:-
:-
This invention consists in a method of obtaining from native or other phosphate
of lime products richer in free phosphoric acid than any which have hitherto been
delivered to commerce.
To this end, I first obtain a crude phosphoric acid liquor by treating native or
other phosphate of lime either by sulphuric acid only, or by a mixture of sulphuric
acid with phosphoric acid, in presence of a sufficient quantity of water. The
methods of performing this treatment will be well understood, and as they
constitute no part of my present invention, they need not be here described.
I use in the said treatment of a native or other phosphate of lime such proportion
of sulphuric acid that the whole or nearly the whole, but in any case a large part,
of such of the phosphoric acid in the resulting solution as is not combined with iron
or alumina, if iron or alumina be present, shall be in the free state.
The said phosphoric acid liquor. so obtained will at first be mixed with solid
sulphate of lime, and may be mixed with other solid bodies also. I separate these'
solid bodies by any of various well-known means, which constitute no part of my
invention, and therefore, need not be here described.
Having thus obtained a solution consisting chiefly of free phosphoric acid, I add
to such solution either carbonate of lime or free lime, hydrated or not, preferably
in such proportion as shall leave in the free state one-third or nearly one-third of
such of the phosphoric acid present as is not combined with iron or alumina.
I then evaporate the resulting liquor to a suitable degree of dryness. This
evaporation may be performed in wood tanks lined with lead, and heated by means
of steam-coils of lead piping, or otherwise, as will be well understood.
I do not confine myself to the proportion of carbonate of lime or of free lime
which I have above indicated, since various other proportions may be used without
departing froin the principle of my invention; but the proportion which is above
mentioned is one which I have found to give a very advantageous result.
Di

page_text: What is new in this nvention consists in adding to phosphoric acid liquor
obtained by treating native or other phosphate of lime by sulphuric acid as above
indicated either carbonate of lime or free lime, hydrated or not, in such quantity as
to leave some and preferably about one third but more or less as may be preferred
of the phosphoric acid in the free state, and then evaporating the resulting liquor
to a suitable degree of dryness.
I, EDWARD PACKARD, junior, of The Grove House, Bramford, near Ipswich, in
the County of Suffolk, do hereby declare the nature of my Invention for "IMPROVE-
MENTS IN OBTAINING FROM. NATIVE OR OTHER PHOSPHATE OF LIME PRODUCTS
RICH IN PHOSPHORIC ACID," and in what inanner the same is to be performed, to
be particularly described and ascertained in'and by the following statement:-
1
This invention consists in a method of obtaining from native or other phosphate
of lime products richer in free phosphoric acid than any which have hitherto been
delivered to commerce.
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:.
'
г.
To this end, I first obtain a crude phosphoric acid liquor by treating native or
other phosphate of lime either by sulphuric acid only; or by'a mixture of sulphuric
acid with phosphoric acid, in presence of a sufficient quantity of water. Thie
method of performing this operation will be well understood, and as it constitutes
no part of my present invention need not be here described.
+ 1
:,
I use in the said treatment of a native or other phosphate of lime such pro-
portion of sulphuric "acid that the whole or nearly the whole, but in any case a
large part, of such of the phosphoric acid in the resulting solution as is not
combined with iron or alumina, if iron or alumina be present, shall be in the free
state.
|
1.
"
.
The said phosphoric acid liquor so obtained will at first be mixed with solid
sulphate of lime, and may be mixed with other solid bodies also. 'I separate these
solid bodies by any of various well-known means, which constitute no part of the
present invention, and therefore, need not be liere described.
1
4
..F
Having thus obtained a solution consisting chiefly of free phosphoric acid, I add
to such solution either carbonate of lime or free lime, hydrated or not, preferably
in such proportion as shall leave in the free state one-third or nearly one-third of
such of the phosphoric acid present as is not combined with iron or alumina.
1 then evaporate the resulting liquor to a suitable degree of dryness. This
evaporation may be performed in wood tanks lined with lead, and heated by means
of steam-coils of lead piping, or otherwise, as will be well understood.
-
I do not confine myself to the proportion of carbonate of lime or of free line
which I have above indicated, since various other proportions may be used without
departing from the principle of my invention; but the proportion which is above
mentioned is one which I have found to give a very advantageous result.'
1
T

page_text: 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 the method of obtaining products rich in phosphoric acid which consists
in adding to phosphoric acid liquor which has been obtained by treating native or
other phosphate of lime by such proportion of sulphuric acid, mixed or not with
phosphoric acid, that the whole or nearly the whole but in any case a large part
of such of the phosphoric acid in the resulting solution as is not combined with
iron or alumina shall be in the free state, either carbonate of lime, or free line,
hydrated or not, in such quantity as to leave some and preferably about one-third,
but more or less as may be preferred, of the phosphoric acid of the said liquor in
the state of free phosphoric acid, and then evaporating the thus partially neutralized
liquor to a suitable degree of dryness.
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