Improvements in the Manufacture of Phosphatic Slags of a High. Percentage of Soluble Phosphate with or without Magnesia or Potash.
Year: 1894

page_text: Date of Application, 9th Mar., 1894
Complete Specification Left, 8th Dec., 1894-Accepted, 9th Mar., 1895
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Phosphatic Slags of a High.
Percentage of Soluble Phosphate with or without Magnesia or
Potash.
1, EDUARD DIETZ, of 90 Witte-de-Withstraate Rotterdam, in the Kingdom of
The Netherlands, Engineer, do hereby declare the nature of this invention to be
as follows:-
The present invention relates to improvements in the manufacture of phosphatic
slags by the basic steel making process and consists in employing natural or
artificial phosphates instead of lime or magnesia alone.
In order to carry out my invention I use as apparatus, wherein the process is to
take place, the basic converter or the Siemens-Martin furnace.
The natural phosphates containing moisture and carbonates have to be calcined,
the artificial ones however, are merely to be given a cherry-red heat for the
purpose of saving the heat of the converter they have subsequently to be
put into.
When a Siemens-Martin furnace is to be used such a calcining or heating of the
phosphates is unnecessary.
After having prepared the phosphates in this way, they are put in the converter
together with the crude-iron and after a few minutes blowing the. formed slag is
poured out of the apparatus and a new quantity of phosphates containing a sufficient
amount of lime or magnesia is added to the iron-bath in order to combine with all
the phosphoric acid of the pig-iron.
As it may be easily understood, the enormous heat produced in the converter is
advantageously utilized in this process, in the meantime there is produced by the
reaction which takes place therein, a basic slag containing a phosphate soluble in
the soil.
In order to obtain a still larger amount of slag I employ separately from the
convertor a Siemens-Martin furnace in which natural phosphates or the additions,
also feldspar, magnesia and the like are heated and partly smelted whereupon hot
slag from the converter is added for the purpose of completely smelting the
phosphates or the additions, thus obtaining a slag of a predetermined percentage of
phosphate, potash or magnesia. A continual working in the furnace will of course
be of highest advantage.
2004
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in the Manufacture of Phosphatic Slags of a High
Percentage of Soluble Phosphate with or without Magnesia or
Potash.
I, EDUARD DIETZ, of 90 Witte-de-Withstraate Rotterdam, in the Kingdom of
Netherlands, 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 present invention relates to improvements in the manufacture of phosphatic
slags by the basic steel making process, and consists in employing as addition natural
or artificial phosphates containing free lime or such phosphates mixed with an
amount of lime or magnesia proportionate to the amount of phosphorus to be
withdrawn from the crude iron, instead of lime or magnesia alone.
The process which forms the subject of my invention, can be carried out in the
usual basic converter or in the Siemens-Martin furnace, and, using the former,
I introduce the phosphates in a hot state for the purpose of economising the heat.
Natural phosphates such as phosphorite or apatite containing moisture and
carbonates are first calcined for expelling the water and the carbonic acid.
The phosphates are introduced into the converter together with the crude iron in
the proportion of about 1 to 10 (or more, but not exceeding an amount of 20 p.c. of
phosphates) and if necessary with an addition of lime or magnesia so that the total
amount of basic additions will be about 20 p.c. and after a few minutes blowing the
slag which has taken up a considerable quantity of the phosphorus contained in the
iron, is poured out. A new quantity of heated or calcined phosphates containing
lime in the basic state which will equal about half the amount of the former
mineral charges is thereupon again added to the bath, and the blowing continued
until all the phosphorus of the crude iron has been oxydized yielding a phosphate in
the slag which is easily taken up by the plants. If necessary the operation may be
repeated for a third time.
In carrying out the process in a Siemens-Martin furnace the preliminary heating
or calcining of the described addition is not necessary.
In order to obtain a still larger quantity of slag containing a predetermined
amount of phosphate soluble in the soil with or without other fertilizing agents,
I heat or smelt in a separate Siemens-Martin furnace the quantity of phosphate
requisite for that purpose alone or together with feldspar, magnesia or other mineral
salts, and add thereto the slag from the converter. The mass is then completely
smelted, and it forms a fertilizer of a given percentage of phosphate soluble in the
soil. potash, magnesia, and the like. As an example I may mix the slag of each
convertor charge (which will contain about 800 pounds of iron) with about 400
pounds of feldspar and 400 pounds of magnesia, keeping the mixture for a while in
à smelted state in the furnace, after which it is poured out cooled and pulverized,
thus obtaining a fertilizer of high value.
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 process of producing slag containing a high percentage of soluble
phosphate by the basic steel making process, consisting in adding natural or
artificial phosphate containing free lime to the bath of crude iron in substitution of
the usual basic addition, essentially as described.
2. The process of producing slag containing a high percentage of soluble
phosphate by the basic steel making process in the basic converter consisting in

page_text: adding heated or preliminarily calcined natural or artificial phosphate containing
free lime to the bath of crude iron in substitution of the usual basic addition.
3. In combination with the described process of producing slags containing a high
percentage of phosphate or phosphates soluble in the soil, smelting the slag from the
converter together with another amount of natural or artificial phosphate previously
heated or smelted in a Siemens-Martin furnace with or without the addition of
feldspar, magnesia or other mineral salts, substantially as and for the purpose
stated.
Dated this 8th day of December 1894.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.