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Патент USA US2115771

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May 3, 1938.
2,115,771 ‘
Filed Jan. 29, 1954
Patented Maya; 1938
' " “2,115,771. -
raocass roa rnooocmo Gamma
D. Hellmers,
29, 1984,
Serial No. 708,882
<1 Claim.
(CI. 83-94)
The preferred form of carrying out my inven
tion is illustrated in the accompanying drawing
The present invention relates to an improve-l
ment in a process for producing granular borax
which illustrates the method of discharging the
and the product obtained thereby, and its prin . anhydrous borax from the furnace in the form
. cipal object is to facilitate the commercial
5 handling of borax and to render the same more
of a thread, of cooling the thread and of immedi
ately breaking the same into short lengths. When
referring to the thread I wish to have it under
stood that I do not necessarily mean a thread of
round cross-section, but that I also wish to cover,
Borax at the present time is commercially
handled either in the crystalline form of the
decahydrate NBaBiO'LlOHzO, or as anhydrous
a thread inthe form of a ribbonor even a thin 10
l0 borax NazBaOr. when borax is placed on the
narrow sheet, the principal object of the inven?
tion being to cause the molten dehydrated borax
to solidify and to be broken up into thin pieces
market in the form of the decahydrate it carries
.a large amount of water, which unnecessarily
increases the weight of 'the borax and makes
the shipping and other commercial handling of
15 the borax very expensive and the large water con
‘ which lend themselves to pulverizing ' or com
minuting action much more readily'than a solid 15
_ \ tent is objectionable in use of the borax for many
purposes. It is preferred, therefore, to reduce
the decahydrate to the anhydrous borax or to
substantially anhydrous borax, before placing the
20 same on the market, and this has been usually
done by melting the decahydrate in a furnace for
driving oil? the water and by pouring the molten
material into molds where ‘it is cooled so as to
form a very hard mass that is subsequently
25 crushed or pulverized in any suitable pulverizing
While I have shown only the preferred form of
Molten anhydrous borax poured and cooled to
produce a solid mass of this character is very
di?icult to reduce and it takes an excessive amount
30 .of power for breaking up such borax into a com
minuted‘ condition. In breaking up the borax
there is also always the danger of contaminating
the borax during the crushing operation by par
ticles of metal or whatever substance the crush
35 mg device happens to be made of. It is, for in
stance, very serious to contaminate the borax with
even a small amount of iron, and if such con
carrying out my invention, I wish to have it '
understood that various changes or modifications
may be made within the scope of the claim here
to attached without departing from the spirit
of‘ the invention.
In‘ carrying out my invention I v?rst melt the
decahydrate ‘of borax in the furnace I, and I
continue this heating until anhydrous borax in
the molten state remains. Then I discharge the
anhydrous molten mass through the spout 2 in
the form of a comparatively thin thread or ribbon
of molten nhydrous borax indicated at 3. This
thread is scharged upon a water-cooled drum
4 which is revolved by any suitable means .and
reciprocated axially as by the eccentric 5 so that
the descending thread continuously contacts a
new portion of the drum whereby it is cooled more I '
eiliciently. The rate of the rotaryspeed of the 35
drum and the rate of reciprocation are prefer
ably proportioned so that the thread if allowed '
to remain on the drum would form a‘ spiral there‘
tamination, takes place, the product must be von. However, after a few turns of the drum the‘
‘ puri?ed again after the pulverizing operation is thread has become cooled su?iciently to be brittle’ 40
40 ?nished in order to make the anhydrous borax and mostly breaks up into chunks, and any of _
marketable for a good many uses.
the resolidified material that’ remains attached
I have discovered a much more economical to the drum is removed from the drum- by a
way of treating borax whereby the difiiculties scraper or any other suitable instrumentality.
outlined are avoided. In my process I do not
45 discharge the molten anhydrous borax from the
furnace and cast it in the form of a solid block,
but instead I discharge the anhydrous borax in
the form of a comparatively ?ne thread or thin
ribbon, and cause the thread or ribbon to be
50 _ cooled and broken up into short pieces immedi
ately upon cooling. The borax in cooling breaks
itself up into pieces from one to live inches in
size. If the anhydrous borax is presented in such
a manner it is brittle and can be pulverized very
55 easily in standard reducing machinery.
The‘ borax when cool will break of its own accord
into pieces and the scraper will clean the drum
should any of the borax adhere thereto. I prefer
ably arrange the drum 4 somewhat longer ‘than’
the length of its stroke so as to present an ac
tive central area 6 which receives the thread from
the spout 2 and two inactive end portions 1 and 8.
I also preferably provide two scrapers 9- and I0,
spaced by a few turns from the transverse plane
of the spout on opposite sides of the plane.
The ‘
drawing shows the drum in one of its end posi- 66
2 ,
‘tions and the spout’ as discharging on one end
The advantages of treating borax'in this man
of the active area. As'the drum moves to the ner‘are
apparent from the foregoing description.
right and makes a few turns,‘ the ?rst turn of the 1'
It takes less power to break up‘v the pieces of
thread, which at that time has cooled suf?ciently thread
or thin ribbon than it would to break up
to be brittle. .reaches the right scraper In which
mass; the contamination of the borax by
removes the first turn and continues to remove v
additional turns of the spiral as the drum ad-' the metal of the comminuting apparatus is pre
vances. When the drum reaches the end of vented since less power is required for crush
its right hand travel, there will be a few turns ing the borax, less dust is formed during the
10 left on the drum and the left hand scraper will pulverizing action, and the borax is broken up
into particles of more even granular size than
be in contact with the left inactive end of the ' could
be obtained by the breaking up of solid 10
drum. The drum now reverses its direction and blocks of borax.
moves to the left which causes the thread to
I claim:
double up on itself through a short distance until
Process of producing anhydrous borax com
the remaining turns have been covered, where
upon the spiral will be continued in a single prising melting and dehydrating borax decahy 15
layer. After the-drum has moved to the left by drate by heat to produce molten anhydrous borax
the width of a féw turns, the ?rst turns of the left glass; discharging the molten borax glass so pro
hand end of the spiral will reach the left hand duced, in the form of a thin threadlike stream
upon the surface of a rotating cooling drum,
scraper 9 and the scraping action will now pro
ceed from left to right. It will be noted that thereby solidifying and breaking up the glass into 20
the thread will be broken away from the drum relatively short lengths which can be ground
without the production of excessive ?nes or con
in comparatively short pieces which ,may be col
lected and which may be easily pulverized there— tamination by metallic impurities from the grind
after in a suitable pulverizer. As above stated ing apparatus; and so grinding suchshortlengths.
the breaking of the borax into small pieces is
due to thecooling of the’borax.
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