The Manufacture and Production of Alkali-calcium Phosphate.
Year: 1899

page_text: Date of Application, 28th June, 1899
Complete Specification Left, 19th Mar., 1900-Accepted, 2nd June, 1900
PROVISIONAL SPECIFICATION.
The Manufacture and Production of Alkali-calcium Phosphate.
.:
I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been com-
municated to me from abroad by Franz Hasslacher, of 26, Bleichstrasse (Peters-
thor) Frankfort-on-Maine, in the German Empire) to be as follows:-
By thoroughly mixing tribasic phosphate of lime with an alkaline sulphate
and charcoal, and then heating and at the same time stirring the mixture, until
it reaches an incipient red heat, and cakes together or becomes fused, a pro-
duct is obtained containing practically the whole of both the phosphoric acid
and the alkali employed, in a condition in which they are soluble only in or by
means of citrates.
To obtain this result two molecular proportions of the sulphate of an alkali
together with the quantity of charcoal required for the reduction of the alkali-
sulphate are caused to react upon one molecular proportion of tribasic phosphate
of lime; calcium sulphide and the above mentioned product will be formed.
As the composition of the crude phosphate varies, it is advisable to make fusing
tests on a comparatively small scale, in order to ascertain the mixing proportions
most favourable to the formation of the above mentioned product."
Any carbonates of alkalies that may have developed from the carbonate of
lime of the crude phosphates and any sulphate that may have remained unde-
composed, and other compounds soluble in water, can be eliminated from the
alkali-calcium-phosphate by washing the fused mixture with cold water.
Pure sulphate or sulphate which is not quite pure, or mixtures of such sulphates
may be used, in producing the fused substance, provided they be such as not to
cause an inferior final product, nor injuriously affect the desired reaction.
Dated this 28th day of June 1899.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
The Manufacture and Production of Alkali-calcium Phosphate.
I, JAMES YATE JOHNSON, of 47, Lincoln's Inn Fields, in the County of London,
Gentleman, do hereby declare the nature of this invention (which has been com-
municated to me from abroad by Franz Hasslacher, of 26, Bleichstrasse (Peters-
thor) Frankfort-on-Maine in the German Empire) and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement: --
By thoroughly mixing tribasic phosphate of lime with an alkaline sulphate

page_text: and coal or other carbonaceous matter and then heating, and at the same time
stirring the mixture until it reaches an incipient red heat, and cakes together,
or begins to fuse, a new product is obtained containing practically the whole of
both the phosphoric acid and the alkali of the sulphate employed, in a condition
in which the said product is soluble only in, or by means of, citrates.
To attain this result two molecular proportions of the sulphate of an alkali,
together with the quantity of coal or carbonaceous matter required for the re-
duction of an alkali-sulphate, are caused to react upon one molecular proportion
of tribasic phosphate of lime. Calcium sulphide, and the above-mentioned new
product (alkali-calcium-phosphate soluble in citrates) will be formed.
As the composition of the crude phosphate varies it is advisable to make
fusing tests on a comparatively small scale, in order to ascertain the quantities
of the ingredients necessary to give the aforesaid molecular proportions and con-
sequently the most favorable results in the formation of the above mentioned
product.
Any carbonates of alkalies that may have developed froin the carbonate of
lime of the crude phosphates, and any sulphate that may have remained unde
composed or sulphides and other compounds soluble in water, can be eliminated
from the alkali-calcium-phosphate by washing the fused mixture with cold water.
Pure sulphate, or sulphate which is not quite pure, or mixtures of such sulphates
such as Stassfurt salts,, may be used in producing the fused substance, provided
they be such as not to cause an objectionably inferior final product, nor in-
juriously affect the desired reaction.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed, I declare that what I
claim is :-
1. The manufacture of an alkali-calcium-phosphate soluble in citrates by
fusing one molecular proportion of tribasic phosphate of lime with two mole-
cular proportions of an alkali-sulphate and with the amount of coal or other
carbonaceous matter necessary for the reduction of the alkali sulphate.
2. As a new article of manufacture alkali-calcium-phosphate soluble in citrates
and obtained from an alkali-sulphate and tribasic phosphate of lime as herein-
before explained.
Dated this 10+1
1
1000
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.