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Патент USA US2130626

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Sept. 20, 1938.
H. E. KAISER
2,130,626
PROCESS FOR QUENCHING PORTLAND CEMENT CLINKERS '
‘
Filed Sept 20, 193-7
[1'2 venfor:
H rry Z’. Kaiser.
?ii'arnely.
2,130,626
Patented (Sept. 20, 1938v ~
UNITED STATES PATENT ._-OFFlCE "
23130526
.
v
raocsss For. QUENCHING PORTLAND
CLINKEB
Harry
a. mm‘, are...
+ 1
,
REISSUED
Nov 2 6 1940 '
assixnor to Cali
‘ fornia Portland Cement Company, Los Angeles,
CaliL, a corporation of California
v
Application September 20, ‘1937, Serial No.1164,61“‘
'
10 Claims.
(01. 263-53?)
This invention relates generally to the manu
facture of Portland cement, and has to do par
ticularly with an improved process for rapidly
quenching Portland cement clinker by means of
5 another Portland cement clinker that is ?nely
divided and‘ admixed with the clinker undergo
ing quenching, under conditions that effect rapid
and uniform cooling of the latter.
It‘has come to be recognized that very de?nite
10 advantages, from a number of standpoints, re
sult from quenching, i. e. very rapid cooling, of
Portland cement clinker. Theoretically, one ob
ject of rapid quenching of the clinker while it
is at substantially the clinker forming tempera
15 ture, is to “freeze" the equilibrium which has
‘ been set up at the clinkering temperatures among
the various compounds in vthe clinker. Accord
ingly,
it is desirable to quench the clinker im- -
'
proper quenching e?ect. I have obtained very
satisfactory results by admixing with one part
of the hot clinker, around three parts by weight
of the quenching clinker of a ?neness passing a '
quarter-inch mesh screen. As indicated, these
relative proportions of the admixed hot and,
quenching clinker may vary in accordance with
other factors, as for example the temperature
differential between the two materials in a given
instance‘. In this connection itlmay be observed
10'
that the quenching clinker may be cold, or it
may be slightly heated to atemperature under
say 300° F. As a general rule the proportion of
quenching clinker-in the admixture will be sub
stantially in excess of the hot clinker undergoing 15
quenching.
‘
.
For the purpose of facilitating the desired ra
pidity and uniformity 'of quenching, the hot
clinker and quenching clinker may be rapidly
mediately or very shortly after it passes from and intimately admixed in any suitable manner
20
20 the clinkering zone of the kiln. It will sui?ce within a cooling zone, for example in an elongated
to state, without entering into a speci?c discus- ‘
sion of the individual compounds or their inter
relationship and effects under equilibrium con
ditions, that it hasbecome recognized that by
25 maintaining or freezing that equilibrium by rapid
cylinder that is rotated to give continuous mixing
agitation. The admixture is maintained in the
cooling zone fora period of time‘ required to drop
the clinker temperature through the proper
quenching-range. Various ‘factors may‘ enter into
quenching, certain properties of the clinker itself, _ the
time element, but it may be stated, as illus
and of the ?nished cement, are de?nitely im
trative, that ordinarily it will be desirable to cool
proved.
~
the clinker from a temperature that may range
A, number of apparent advantages result from from well above 1800° vF. to ashigh as 2600° F., 30
30 rapid quenching of Portland cement clinker. to a temperature under 7 00° F., within a period of
' Quenching appears to promote ease of grinda
bility, as indicated by-the fact that the quenched
clinker will be reduced to a ?ner state of divi
‘sion when subjected to a given grinding opera
35 tion‘, than a normally cooled or quenched clinker
ground under the, same conditions. It is also indi
cated that the resultant clinker will have less
tendency to “dust." ' Tests indicate that cementi
tidus or concrete mixtures containing cement
40 made from the quenched clinker, show a mate‘
rially lowered degree of expansion under the
. standardmethods of determination.
In ‘accordance with the invention, the hot
clinker is admixed with ‘a ?nely divided and
45 relatively cool Portland cement clinker (herein
after referred to asthe quenching clinker), pref
erably immediately after the hot clinker leaves
the clinkering zone of the kiln, in order that the.
?ve minutes. After the hot clinker has ‘become
quenched,»the quenching- clinker is then sep
arated therefrom in one or more separating 'or
screening stages su?icient to free the quenched 35
clinker from the quenching clinker.’ Absolute
and complete separation may not be essential,
particularly where the two clinkers have similar 7
composition and properties, and in any event a
small percentage of quenching clinker ?nes re 40
maining in the quenched clinker will be unobjec
tionable. The quenched clinker may then be
ground or processed by any of the usual methods '
‘of
producing Portland cement. The separated
’ quenching ‘clinker however, having become su?i- '
45
ciently'f cooled before separation from the
quenched clinker, or afterward, is again used as
a quenching medium for "subsequently formed
clinker.
In this manner, the same quantity of
“freezing” effect of quenching may be had upon > quenching clinker may be recirculated repeatedly 50
50 the hot clinker while it is still as close as possible as a quenching medium for a continuously ?ow
to the kiln temperature. If desired the quench
ing stream of hot Portland cement clinker.
ing clinker may be introduced into the nose of the
Perhaps the foregoing description of the proc
kiln itself. Any suitable quantity'or proportion
ess can be ampli?ed to advantage by reference to
of the quenching clinker may be admixed with a typical and illustrative system for carrying out
the hot clinker that will produce the desired and a
2,130,626 , "
the invention, as shown diagrammatically and in Portland'cement clinker by admixing relatively‘
?ow sheet form in the accompanying drawing. » cool Portland cement clinker with the hot clinker,
Portland cement clinker formed in the clinker
maintaining the clinkers in intimate contact
- ing kiln I 0 is delivered by suitable means, con
while the hot clinker cools, and separating added
ventionally illustrated by chute ll, into the up- clinker
from the quenched clinker.
per end of an elongated cylindn'c cooler l2 that
5.
The
process that includes, quenching hot
preferably is slowly rotated by suitable means, Portland cement
clinker by admixing relatively
not shown’. The ?nely divided quenching clinker cool quenching Portland cement clinker with the
may be fed from a conveyor line l3 through line "
10 ll to be admixed with the hot clinker at the‘inlet hot clinker, maintaining the clinkers in intimate
contact‘ while the hot clinker cools, separating
.end of chute II and directly ‘after the clinker quenching clinker ‘from the quenched clinker, and 10
leaves the kiln, for the quenching clinker may be admixing the separated quenching clinker with
taken via line I5 and fed into the inlet end |2a subsequently produced hot Portland ‘cement
of the cooling' chamber. Asillustrated, the feed ._ clinker to quench same.
~
end of the chamber may contain a suitablere
6. The process that includes, quenching a con 15
fractory lining [6. The two clinkers are- rapidly tinuously
stream of hot Portland cement
brought into intimate contact and subjected to clinker by?owing
continuously
to and intimately
thorough admixture within the rotatingcooler admixing with the hot adding
clinker a relatively ?ne
l2. The admixture will remain in the cooler forv and cool Portland ‘cement clinker, maintaining
20 a period of time required to quench the clinker
the clinkers in contact while the hot clinker' 20
through the proper temperature range, and ordi
cools, and then continuously separating added
narily a time period of around ?ve to ten minutes clinker from the quenched clinker.
will su?ice where a ratio of substantially three
7. The process that includes, quenching a con
parts of quenching clinker to one part of thehot tinuously
?owing stream of hot Portland cement
clinker is used.
'
'
‘clinker by continuously adding to and intimately
The admixture may be subjected to further admixing with the hot clinker a relatively ?ne
cooling and further agitation to completely sep
and cool quenching Portland cement clinker,
arate the quenching clinker from the quenched maintaining
the clinkers in contact whilethe
clinker, in a second cooler ll into whichthe ma
30 terial is'fed from the discharge end of cooler hot clinker cools, then continuously separating
quenching clinker from the quenched clinker,
I2 via line [8. Cooler I ‘I may have one or more and continuously returning/and adding separated
screen sections l9 through which the freed and '
relatively ?ne quenching clinker particles will - quenching clinker to the hot clinker stream.
8. The process that includes, continuously pass
a stream of hot Portland cement clinker from
bin 2|. As illustrated, the separated quenching ' ing
a clinkering zone, then quenching the hot clinker
pass into a hopper 20 and thence into a storage
clinkerwill be continuously taken from bin 2|
by way of conveyor line B to be returned for ad
mixture with the hot clinker being discharged
from
the ' clinker .kiln.
Separated
quenched
clinker is discharged from cooler ll into storage
bin 22. During the quenching and cooling stages,
particles of the quenched clinker reduced to‘ a
?neness enabling them to pass through the screen
45
» l9, may become separated out with the quench~
ing clinker,
resulting in an increase in the quan- _ '
tity of clinker being discharged into bin 2 I. Any
excess over 'the amount of quenching clinker re
quired for installation, may be combined with the
quenched clinker in storage 22, as by providing
anv over?ow ledge‘ at 23 between the two bins.
I claim:
by immediately a d continuously introducing to
and intimately ‘a
xing- with the hot clinker
stream a relatively ?nely divided and 0601 Port
land cement clinker, and passing the mixture
through a cooling zone..
9. The .process that includes, continuously pass
ing a stream of hot Portland cement clinker from
‘a clinkering ‘zone, then‘ quenching the hot clinker
by immediately and continuously introducing to
and intimately admixing with the hot clinker 45
stream a relatively ?nely divided and cool Port
land cement quenching clinker, passing the mix
ture through a cooling zone, and then continu
ously separating the quenching clinker from ‘the
quenched clinker.
}
10. The process that includes, continuously
passing a stream ofhot Portland cement‘ clinker
from a. clinkering zone, then quenching the hot
1. The process that includes, ‘quenching ‘hot
Portland cement clinker by admixing relatively
cool‘ Portland cement clinker with the hot clinker. ‘clinker-by immediately and continuously intro
2. The process that includes, quenching hot ducing to and intimately admixing with the hot
Portlandcement clinker by admixing relatively clinker
a relatively ?nely divided and cool
cool and ?nely divided Portland cement clinker Portlandstream
cement quenching clinker,‘ _
g- the
with the hot clinker.
, '
‘
through a coolingvv zone, then continu
,3. 'Ihe process vthat includes, quenching hot mixture
ously separating added quenching clinker from
Portland cement clinker by admixing relatively the
quenched clinker, and continuously return;
cool and ?nely divided Portland cement clinker ing and
adding separated quenching clinker to
withthe hot clinker, and agitating the mixture
while the hot clinker‘ cools.
' 4.,/The' process thatl includes, quenching hot.
the hot clinker stream.
'
‘HARRY E. KAISER.
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