CA2086790C - A method for electrostatically processing crude salts at high levels of ambient humidity - Google Patents
A method for electrostatically processing crude salts at high levels of ambient humidity Download PDFInfo
- Publication number
- CA2086790C CA2086790C CA002086790A CA2086790A CA2086790C CA 2086790 C CA2086790 C CA 2086790C CA 002086790 A CA002086790 A CA 002086790A CA 2086790 A CA2086790 A CA 2086790A CA 2086790 C CA2086790 C CA 2086790C
- Authority
- CA
- Canada
- Prior art keywords
- potash
- kieserite
- stage
- conditioning agent
- salt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 150000003839 salts Chemical class 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 13
- 230000003750 conditioning effect Effects 0.000 claims abstract description 27
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical class [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 239000012080 ambient air Substances 0.000 claims abstract description 5
- 235000002639 sodium chloride Nutrition 0.000 claims description 25
- 229910052928 kieserite Inorganic materials 0.000 claims description 18
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 16
- 229940072033 potash Drugs 0.000 claims description 14
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 14
- 235000015320 potassium carbonate Nutrition 0.000 claims description 14
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 11
- 239000011780 sodium chloride Substances 0.000 claims description 11
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 claims description 6
- 229960004889 salicylic acid Drugs 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 235000019341 magnesium sulphate Nutrition 0.000 claims 1
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 abstract description 10
- 239000012141 concentrate Substances 0.000 description 12
- 239000001103 potassium chloride Substances 0.000 description 9
- 235000011164 potassium chloride Nutrition 0.000 description 9
- 230000005484 gravity Effects 0.000 description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 6
- 238000000746 purification Methods 0.000 description 5
- 230000001143 conditioned effect Effects 0.000 description 4
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 239000000194 fatty acid Substances 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 230000005686 electrostatic field Effects 0.000 description 3
- 239000003337 fertilizer Substances 0.000 description 3
- 239000004310 lactic acid Substances 0.000 description 3
- 235000014655 lactic acid Nutrition 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000003570 air Substances 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- -1 aromatic carboxylic acids Chemical class 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- LOHOSHDZQVKDPS-UHFFFAOYSA-N 2-bromonaphthalen-1-ol Chemical compound C1=CC=C2C(O)=C(Br)C=CC2=C1 LOHOSHDZQVKDPS-UHFFFAOYSA-N 0.000 description 1
- WONRDHPFOHAWOG-UHFFFAOYSA-N 2-chloronaphthalen-1-ol Chemical compound C1=CC=C2C(O)=C(Cl)C=CC2=C1 WONRDHPFOHAWOG-UHFFFAOYSA-N 0.000 description 1
- QYCBZFRDGXIZIP-UHFFFAOYSA-N 2-hydroxy-2-phenylbutanoic acid Chemical compound CCC(O)(C(O)=O)C1=CC=CC=C1 QYCBZFRDGXIZIP-UHFFFAOYSA-N 0.000 description 1
- SYUYTOYKQOAVDW-UHFFFAOYSA-N 2-nitrosonaphthalen-1-ol Chemical compound C1=CC=C2C(O)=C(N=O)C=CC2=C1 SYUYTOYKQOAVDW-UHFFFAOYSA-N 0.000 description 1
- WHSXTWFYRGOBGO-UHFFFAOYSA-N 3-methylsalicylic acid Chemical compound CC1=CC=CC(C(O)=O)=C1O WHSXTWFYRGOBGO-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/003—Pretreatment of the solids prior to electrostatic separation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
Glycolic acid is used as an auxiliary conditioning agent for improving the yields during the electrostatic separation of crude potash salts at high levels of humidity in the ambient air.
Description
Crude potash salt, commonly consist o1~ sylvite (= KCl) and rock salt may be separaaed by electrostatic means. Other components such as kieserite (MgS04~H20) or canzallite (KCI~MgC12~6H20) could be found too.
German Patent DE-PS 19 53 534 describes a procedure by which, for the combined extraction of sylvite arid kieserite, the crushed cruder potash salt is first conditioned with aromatic carboxylic acids, such as salicylic acid or cresotinic acid, and then additionally with so-called auxiliary conditioning agents, namely carboxylic acids such as lactic acid, hydroxyphenylbutyric acid or na~phthols, such as f3-napht.hol, chloro- or bromonaphthol or nitrosonaphthol. The auxiliary conditioning agents are in all case; substances which are acidic in character due to the presence of electronegatively acting atoms or groups of atoms, such as -C1, -Br, OH, -COOR, -CN or -NO. The conditioning agents are used in amounts of 100 g per tonne of crushed crude potash salt while the auxiliary conditioning agents are used in amounts of 50 g/tonne.
The conditioned crude potash salt is then triboelectrically char<~ed by vigorously agitating the particles of crude potash salt against each other in ambient air having a relative humidity of 2.5 to 15o and a temperati.zre of 30 to 72°C; then, under the given conditions, the salt i::> exposed to tl-:e effect of a strong electrostatic field in a gravity separator. As the potash salt ~c~~~oo passes through the electrostatic field, particles of sylvite and kieserite are deflected to the positive electrode and can be collected as a concentrate at the foot of the electrode. In the area of the negative electrode a residue consisting essentially of rock salt and anhydrite is accumulated and can be disposed of.
The middlings which also flow from the gravity separator after having passed through the electrostatic field without being substantially deflected, are recycled back to the triboelectrical charging stage and are then re-charged and passed through the gravity separator once more together with fresh feed material.
The ratio of sylvite to kieserite in the concentrate accumulating at the positive electrode in the gravity separator can be influenced not only by varying the ratio of conditioning agent to auxiliary conditioning agent, but also by the type of auxiliary conditioning agent used and by the relative humidity of the air surrounding the feed material while the latter is being triboelectriaally charged and while it is undergoing electrostatic separation.
Electrostatic separation can also be used to further process the sylvite-kieserite concentrate into industrially pure potash fertilizer salt. German Patent DE-PS 10 76 5g3 describes a procedure for accomplishing this, wherein already conditioned intermediate products from the electrostatic processing of potash salts are further conditioned with fatty acids containing at ~~~~~oo Ieast 3 C-atoms in the molecule and then eiectrostaticaliy separated in a gravity separator into a potash pre-concentrate and a kieserite pre-concentrate containing about 820 of the kieserite introduced with the crude salt.
In a further electrostatic separation stage, after carrying out conditioning once more with the above-mentioned fatty acids and also after triboelectrical charging, a potash fertilizer salt containing more than 40~ K20 is obtained as the product together with a residual fraction consisting of more than 40~ rock salt and containing also significant quantities not only of carnallite, kieserite and anhydrite but also of sylvite.
However, when processing crude potash salt for the purpose of obtaining potash fertilizer salt at high absolute levels of atmospheric humidity (>10 g HZO/m3 air), these already known procedures produce unsatisfactory separation results and yields, because in this case the sylvite behaves in an increasingly non-selective manner in the post-purification stage.
Studies have now shown that the charge characteristics of sylvite in the post-purification stage are influenced by the auxiliary conditioning agent used for separating out the rock salt.
'fhe object of the invention is to ensure that, by using an auxiliary conditioning agent for separating out the rock salt, the sylvite can be very selectively charged in the post-purification stage even at high absolute atmospheric humidities. The progress gained by the procedure according to the invention is described by the following examples.
According to the present invention there is provided a procedure for the electrostatic processing of hard salts, especially at high absolute humidity levels in the atmosphere (ambient air) in excess of 10 g/m3 water, e.g.
approx. 15 g/m3, wherein after grinding and conditioning the a multi-stage separation process, first the bulk of the rock salt is removed using salicylic acid as the conditioning agent, and in the subsequent stage the potash and kieserite are separated and finally, in a further stage, the potash is purified and a residual fraction accumulates together there with the pure potash product, characterized in that in the first separation stage the crude salt is treated not only with the conditioning agent salicylic acid but also with the auxiliary conditioning agent glycolic acid.
The Examples given in Table 1 relate to the extraction of a sylvite-kieserite concentrate from a crude salt containing approximately 8.5o K20 and approximately 16.0% kieserite at a temperature of 64°C, corresponding to 10% relative humidity at 15.0 g H20/m3 absolute atmospheric humidity in a tubular gravity separator. Salicylic acid was used as the conditioning agent in the three tests, Monochloroacetic acid (Test 1), lactic acid (Test 2) and, in accordance with the invention, glycolic acid (Test 3) were used as the auxiliary conditioning agents. The glycolic acid is used in the form of a 57o aqueous solution.
The following results were obtained:
t ! , , .-. g. o In In r~ o In In n N
o u, o~ 1 an ., . . .
1 ~
~" ~ i ~ Wn T vc ~
~ ~ ~ ~ ~
~ :fi O r _ v y . 1 ~ ~. 1 L1 p'! V 1 ~' U
i N p 4 ~ ~ r~
C
r i ~
O n , .
~ ~ ' .
G r .
O ' U i ' ~ , i G_ , , O 1f1 vC ~ O N T v0 ~
0~ f' p I ~ CV
.... . ~ ...~a ~ wn n ~ it cZ ~
' u i V ~ 1 ~ ~i ' ,'~~ o 0 0 .. ..
cZ ; ,~
V - I
O
, i +. b ~
0 fh 1t1 e~1 N tW !f ~ N
c p 1~1 0~ vH .~
i . . . . .
b ll . ~ ~ wn .o a~
w ~ ~ ~ .ono te. n A, .d >, e a (n V
O j .C ~ i G ~ ~ ~ ~ ... n "' ~ ~ ~o n 1 ~D O~
~0 ~D p e,1 O ~ ~ 1 G ~p ~ p F O O O O .~ ~~
~ ~
r G
O
U
d ~
W , eo .~ ..
' .. G ~ G
r--i O .C e~ ' a~ ~o z :~ ~ ; ~
yY~.. ~, _ .
.
H ~ > ~ 0 ~ ~ ~ ~ b c H >,yc '~ > a;
O 1 O ~
H - ~ ~ w ',~ ~r~ ~~ ~ .~ G A
U E' N ~
m ... ... .-, _ _ . y ,~ (n U x Q OG
~X G
G U
aR
For all the auxiliary conditioning agents, the Kz0 and kieserite yield in the sylvite-kieserite concentrate is at Ieast 94o and 93~ respectively and the rock salt yield in the residue is at least 69~.
The examples shown in Table 2 depict the extraction of the potash pre-concentrate from the respective syivite-kieserite concentrates in Table 1, at a temperature of 82°C, corresponding to 5~ relative humidity at 15.0 g H20/m3 absolute atmospheric humidity in a tubular gravity separator.
A Clo-Cla fatty acid mixture was used in the amount of 50 g/t feed material.
o ' ' .o o~ o cr ~ 'o I .r cv o o r tr ... a~
"; .c e~: ' v, o .: ~.;
x~~sr , ~a~
.~~ s ,~....
s v ~
.~
' ~
~ r ' ~~~~~v ~~~g ~
; ~ , . .
~
a. ~~'F~~'fd ~..~
S ~
G ' o U ~
' ' o ' a' c n r' o .-, n n ' ~ c cr v. ~ ~
n, 'n :n . . . . . . ' e ~ ~ o ~, ~ a: i ~
~ ~.~
H.' n o~~
~ ' .
.
i a h i .,. '..~ ' ._ ~~~~~a; s~a~~~
,,..,., ..,.., r~ ~ ~o ~ o ~ v~ n .. o .v o ~
w +: , n .r O ~ i ' a U
cd ' ' G
~
Q! i a '~ er o ~ ... .wo o r n av o. ~ o o ' , , . , ' . . . . .
''"' ?. ~f ~a ~o ~ , e~ 'i~ .-~a ~ ' 'u~ i V i O i 7., ' .~
i G ' ~~ i ~v~f r~
n~~~
C . e , . . . . v ' , v v . .
fir ~ o .he ~ wo .r ~ .r ~ ~
O G . , U
1 ' .. C ' ' N Q is >, ; 7, .. , ~ ..
' _ G ~ i i y o~ CJ
-~ V ' I ' .~ E... N ~ :: y .... ' v CS
O .' :: 4:
~ .u Y ~ ~a . .c _ .= ' _. 'C
':
~
~
?
H ~, , b . ~o >
y ' ;~
' o _ . ~'Y _ .. O G N >'-x O '~ ~ N
.S ~,.5c ~ ~
Q ~ '' a ~' cn U j~ v ~ ~ U aG
aG Q ~
In all three test series, the KZU yield in the potash pre-concentrate is more than 87.8 and the kieserite yield in the kieserite pre-concentrate is more than 90.9.
The examples given in Table 3 show the extraction of a potash product from the respective potash pre-concentrates in Table 2 at a temperature of 82'C, corresponding to a 5o relative humidity at 15.0 g H20/m3 absolute atmospheric humidity in a tubular gravity separator. Conditioning was carried out with a C~a-C1s fatty acid mixture in an amount of 50 g/t feed material.
a. Z
a_ ~ n ~o . N .o n e1 er o~ o ~ i v n n ~ ~
'Z3 _ n ~ ~ ~ ~ ~ ~ o x i~
~ i cT~ r~ t .O .d ~- 1 cCt _ i ~, ~ ~ -.
O ' ..r ~ G ~ , n ~ ~ ~ O vN ; p~ ,v0,~ .r ~ 0 ,'gyp :: ~
G ' ~
V
_ t'r i 1 u1 ~ 1r 0: ~ ~ 0W 0 ~ ; v v v v w v ~
~
~ n ~88~.~ .. ~ ~
g~;
~- ;
N . . s __ V 8 - i ..i1 +r ~ G N v!f ~ ~ ~ ~ , ...
~ ~ ~O
. . ;
a~o~ ~~t ~~~ s o a.. , V ' O ~
O
,~ i ~
; ... C N 1~~ V1 ~ N f' ~ o N1 J1 vC
V '~ O~ 0 .D
~ ~ o ~ ~' y o ~i a ~ ~ .
N ' V i _ O g.
O
~~~~s~ ;
G ~ ~ ~ ~ ~ ' _ ui ~ rf :: ~ ~ ~ ~ .r ~n ; v0 o ui O G ' O i O V
~' ,~~.
ri ~ .
o C
r-1 Z_ .c ~ a' r y y i a' ~ y i?
_y. _~
. . .
.
C ~ ' a~ .~
cr . G
. .
~ . > ?: . >
~ :
~
H E- o . -N' , G ~ ~' "~ S ~... ~ ~ ~ ~
~o~S .. .r-' V
~x ~nu5iac~ " axu uxac~
)r~~~
In Test 1 (auxiliary conditioning agent, monochloroacetic acid) a K20 yield of 64.7 is obtained in the post-separation stage. This yield increases to 81.5% in 'felt 2 (auxiliary conditioning agent lactic acid) to 92.80 in Test 3 (auxiliary conditioning agent glycolic acid).
Seen over the whole process, i.e. rock salt separation including pre-separation and post-purification, Test 1 gives a K20-yield of 54.7, Test 2 a yield of 68.6 and Test 3 a yield of 78.8.
Because of the subject of the invention, i.e. because of the discovery that the auxiliary conditioning agent used in the separation of rock salt has a significant influence on the post-purification. it is now possible to operate the ESTA process optimally at high absolute atmospheric humidity levels.
German Patent DE-PS 19 53 534 describes a procedure by which, for the combined extraction of sylvite arid kieserite, the crushed cruder potash salt is first conditioned with aromatic carboxylic acids, such as salicylic acid or cresotinic acid, and then additionally with so-called auxiliary conditioning agents, namely carboxylic acids such as lactic acid, hydroxyphenylbutyric acid or na~phthols, such as f3-napht.hol, chloro- or bromonaphthol or nitrosonaphthol. The auxiliary conditioning agents are in all case; substances which are acidic in character due to the presence of electronegatively acting atoms or groups of atoms, such as -C1, -Br, OH, -COOR, -CN or -NO. The conditioning agents are used in amounts of 100 g per tonne of crushed crude potash salt while the auxiliary conditioning agents are used in amounts of 50 g/tonne.
The conditioned crude potash salt is then triboelectrically char<~ed by vigorously agitating the particles of crude potash salt against each other in ambient air having a relative humidity of 2.5 to 15o and a temperati.zre of 30 to 72°C; then, under the given conditions, the salt i::> exposed to tl-:e effect of a strong electrostatic field in a gravity separator. As the potash salt ~c~~~oo passes through the electrostatic field, particles of sylvite and kieserite are deflected to the positive electrode and can be collected as a concentrate at the foot of the electrode. In the area of the negative electrode a residue consisting essentially of rock salt and anhydrite is accumulated and can be disposed of.
The middlings which also flow from the gravity separator after having passed through the electrostatic field without being substantially deflected, are recycled back to the triboelectrical charging stage and are then re-charged and passed through the gravity separator once more together with fresh feed material.
The ratio of sylvite to kieserite in the concentrate accumulating at the positive electrode in the gravity separator can be influenced not only by varying the ratio of conditioning agent to auxiliary conditioning agent, but also by the type of auxiliary conditioning agent used and by the relative humidity of the air surrounding the feed material while the latter is being triboelectriaally charged and while it is undergoing electrostatic separation.
Electrostatic separation can also be used to further process the sylvite-kieserite concentrate into industrially pure potash fertilizer salt. German Patent DE-PS 10 76 5g3 describes a procedure for accomplishing this, wherein already conditioned intermediate products from the electrostatic processing of potash salts are further conditioned with fatty acids containing at ~~~~~oo Ieast 3 C-atoms in the molecule and then eiectrostaticaliy separated in a gravity separator into a potash pre-concentrate and a kieserite pre-concentrate containing about 820 of the kieserite introduced with the crude salt.
In a further electrostatic separation stage, after carrying out conditioning once more with the above-mentioned fatty acids and also after triboelectrical charging, a potash fertilizer salt containing more than 40~ K20 is obtained as the product together with a residual fraction consisting of more than 40~ rock salt and containing also significant quantities not only of carnallite, kieserite and anhydrite but also of sylvite.
However, when processing crude potash salt for the purpose of obtaining potash fertilizer salt at high absolute levels of atmospheric humidity (>10 g HZO/m3 air), these already known procedures produce unsatisfactory separation results and yields, because in this case the sylvite behaves in an increasingly non-selective manner in the post-purification stage.
Studies have now shown that the charge characteristics of sylvite in the post-purification stage are influenced by the auxiliary conditioning agent used for separating out the rock salt.
'fhe object of the invention is to ensure that, by using an auxiliary conditioning agent for separating out the rock salt, the sylvite can be very selectively charged in the post-purification stage even at high absolute atmospheric humidities. The progress gained by the procedure according to the invention is described by the following examples.
According to the present invention there is provided a procedure for the electrostatic processing of hard salts, especially at high absolute humidity levels in the atmosphere (ambient air) in excess of 10 g/m3 water, e.g.
approx. 15 g/m3, wherein after grinding and conditioning the a multi-stage separation process, first the bulk of the rock salt is removed using salicylic acid as the conditioning agent, and in the subsequent stage the potash and kieserite are separated and finally, in a further stage, the potash is purified and a residual fraction accumulates together there with the pure potash product, characterized in that in the first separation stage the crude salt is treated not only with the conditioning agent salicylic acid but also with the auxiliary conditioning agent glycolic acid.
The Examples given in Table 1 relate to the extraction of a sylvite-kieserite concentrate from a crude salt containing approximately 8.5o K20 and approximately 16.0% kieserite at a temperature of 64°C, corresponding to 10% relative humidity at 15.0 g H20/m3 absolute atmospheric humidity in a tubular gravity separator. Salicylic acid was used as the conditioning agent in the three tests, Monochloroacetic acid (Test 1), lactic acid (Test 2) and, in accordance with the invention, glycolic acid (Test 3) were used as the auxiliary conditioning agents. The glycolic acid is used in the form of a 57o aqueous solution.
The following results were obtained:
t ! , , .-. g. o In In r~ o In In n N
o u, o~ 1 an ., . . .
1 ~
~" ~ i ~ Wn T vc ~
~ ~ ~ ~ ~
~ :fi O r _ v y . 1 ~ ~. 1 L1 p'! V 1 ~' U
i N p 4 ~ ~ r~
C
r i ~
O n , .
~ ~ ' .
G r .
O ' U i ' ~ , i G_ , , O 1f1 vC ~ O N T v0 ~
0~ f' p I ~ CV
.... . ~ ...~a ~ wn n ~ it cZ ~
' u i V ~ 1 ~ ~i ' ,'~~ o 0 0 .. ..
cZ ; ,~
V - I
O
, i +. b ~
0 fh 1t1 e~1 N tW !f ~ N
c p 1~1 0~ vH .~
i . . . . .
b ll . ~ ~ wn .o a~
w ~ ~ ~ .ono te. n A, .d >, e a (n V
O j .C ~ i G ~ ~ ~ ~ ... n "' ~ ~ ~o n 1 ~D O~
~0 ~D p e,1 O ~ ~ 1 G ~p ~ p F O O O O .~ ~~
~ ~
r G
O
U
d ~
W , eo .~ ..
' .. G ~ G
r--i O .C e~ ' a~ ~o z :~ ~ ; ~
yY~.. ~, _ .
.
H ~ > ~ 0 ~ ~ ~ ~ b c H >,yc '~ > a;
O 1 O ~
H - ~ ~ w ',~ ~r~ ~~ ~ .~ G A
U E' N ~
m ... ... .-, _ _ . y ,~ (n U x Q OG
~X G
G U
aR
For all the auxiliary conditioning agents, the Kz0 and kieserite yield in the sylvite-kieserite concentrate is at Ieast 94o and 93~ respectively and the rock salt yield in the residue is at least 69~.
The examples shown in Table 2 depict the extraction of the potash pre-concentrate from the respective syivite-kieserite concentrates in Table 1, at a temperature of 82°C, corresponding to 5~ relative humidity at 15.0 g H20/m3 absolute atmospheric humidity in a tubular gravity separator.
A Clo-Cla fatty acid mixture was used in the amount of 50 g/t feed material.
o ' ' .o o~ o cr ~ 'o I .r cv o o r tr ... a~
"; .c e~: ' v, o .: ~.;
x~~sr , ~a~
.~~ s ,~....
s v ~
.~
' ~
~ r ' ~~~~~v ~~~g ~
; ~ , . .
~
a. ~~'F~~'fd ~..~
S ~
G ' o U ~
' ' o ' a' c n r' o .-, n n ' ~ c cr v. ~ ~
n, 'n :n . . . . . . ' e ~ ~ o ~, ~ a: i ~
~ ~.~
H.' n o~~
~ ' .
.
i a h i .,. '..~ ' ._ ~~~~~a; s~a~~~
,,..,., ..,.., r~ ~ ~o ~ o ~ v~ n .. o .v o ~
w +: , n .r O ~ i ' a U
cd ' ' G
~
Q! i a '~ er o ~ ... .wo o r n av o. ~ o o ' , , . , ' . . . . .
''"' ?. ~f ~a ~o ~ , e~ 'i~ .-~a ~ ' 'u~ i V i O i 7., ' .~
i G ' ~~ i ~v~f r~
n~~~
C . e , . . . . v ' , v v . .
fir ~ o .he ~ wo .r ~ .r ~ ~
O G . , U
1 ' .. C ' ' N Q is >, ; 7, .. , ~ ..
' _ G ~ i i y o~ CJ
-~ V ' I ' .~ E... N ~ :: y .... ' v CS
O .' :: 4:
~ .u Y ~ ~a . .c _ .= ' _. 'C
':
~
~
?
H ~, , b . ~o >
y ' ;~
' o _ . ~'Y _ .. O G N >'-x O '~ ~ N
.S ~,.5c ~ ~
Q ~ '' a ~' cn U j~ v ~ ~ U aG
aG Q ~
In all three test series, the KZU yield in the potash pre-concentrate is more than 87.8 and the kieserite yield in the kieserite pre-concentrate is more than 90.9.
The examples given in Table 3 show the extraction of a potash product from the respective potash pre-concentrates in Table 2 at a temperature of 82'C, corresponding to a 5o relative humidity at 15.0 g H20/m3 absolute atmospheric humidity in a tubular gravity separator. Conditioning was carried out with a C~a-C1s fatty acid mixture in an amount of 50 g/t feed material.
a. Z
a_ ~ n ~o . N .o n e1 er o~ o ~ i v n n ~ ~
'Z3 _ n ~ ~ ~ ~ ~ ~ o x i~
~ i cT~ r~ t .O .d ~- 1 cCt _ i ~, ~ ~ -.
O ' ..r ~ G ~ , n ~ ~ ~ O vN ; p~ ,v0,~ .r ~ 0 ,'gyp :: ~
G ' ~
V
_ t'r i 1 u1 ~ 1r 0: ~ ~ 0W 0 ~ ; v v v v w v ~
~
~ n ~88~.~ .. ~ ~
g~;
~- ;
N . . s __ V 8 - i ..i1 +r ~ G N v!f ~ ~ ~ ~ , ...
~ ~ ~O
. . ;
a~o~ ~~t ~~~ s o a.. , V ' O ~
O
,~ i ~
; ... C N 1~~ V1 ~ N f' ~ o N1 J1 vC
V '~ O~ 0 .D
~ ~ o ~ ~' y o ~i a ~ ~ .
N ' V i _ O g.
O
~~~~s~ ;
G ~ ~ ~ ~ ~ ' _ ui ~ rf :: ~ ~ ~ ~ .r ~n ; v0 o ui O G ' O i O V
~' ,~~.
ri ~ .
o C
r-1 Z_ .c ~ a' r y y i a' ~ y i?
_y. _~
. . .
.
C ~ ' a~ .~
cr . G
. .
~ . > ?: . >
~ :
~
H E- o . -N' , G ~ ~' "~ S ~... ~ ~ ~ ~
~o~S .. .r-' V
~x ~nu5iac~ " axu uxac~
)r~~~
In Test 1 (auxiliary conditioning agent, monochloroacetic acid) a K20 yield of 64.7 is obtained in the post-separation stage. This yield increases to 81.5% in 'felt 2 (auxiliary conditioning agent lactic acid) to 92.80 in Test 3 (auxiliary conditioning agent glycolic acid).
Seen over the whole process, i.e. rock salt separation including pre-separation and post-purification, Test 1 gives a K20-yield of 54.7, Test 2 a yield of 68.6 and Test 3 a yield of 78.8.
Because of the subject of the invention, i.e. because of the discovery that the auxiliary conditioning agent used in the separation of rock salt has a significant influence on the post-purification. it is now possible to operate the ESTA process optimally at high absolute atmospheric humidity levels.
Claims (4)
1. A process for the electrostatic processing of hard salts, wherein after grinding and conditioning in a multi-stage separation process, comprising in a first separation stage the bulk of the rock salt is removed using salicylic acid as the conditioning agent, and in a subsequent stage the potash and kieserite are separated and finally, in a further stage, the potash is purified and a residual fraction accumulates together there with the pure potash product, characterized in that in the first separation stage the crude salt is treated with the conditioning agent salicylic acid and with an amount of 20 to 100 g/t of feed material of auxiliary conditioning agent gylcolic acid.
2. A process for the electrostatic processing of hard salts according to claim wherein the hard salts comprise sylvite (KCl), kieserite (MgSO4.cndot.H2O) and rock salt.
3. A process for the electrostatic processing of hard salts according to claim 1 or claim 2 wherein the absolute humidity levels in the atmosphere (ambient air) are in excess of 10 g/m3 water.
4. A process for the electrostatic processing of hard salts according to claim 1, claim 2 or claim 3 wherein the absolute humidity levels in the atmosphere (ambient air) are in excess of 15 g/m3 water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4200167.6 | 1992-01-07 | ||
| DE4200167A DE4200167C1 (en) | 1992-01-07 | 1992-01-07 | Purificn. of sylvite - comprises treating with salicylic acid and glycolic acid in high humidity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2086790A1 CA2086790A1 (en) | 1993-07-08 |
| CA2086790C true CA2086790C (en) | 2002-10-29 |
Family
ID=6449148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002086790A Expired - Lifetime CA2086790C (en) | 1992-01-07 | 1993-01-06 | A method for electrostatically processing crude salts at high levels of ambient humidity |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2086790C (en) |
| DE (1) | DE4200167C1 (en) |
| IT (1) | IT1261157B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4343625C1 (en) * | 1993-12-21 | 1995-06-22 | Kali & Salz Beteiligungs Ag | Pure kieserite recovery economically from preconcentrate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1953534C3 (en) * | 1969-10-24 | 1974-03-14 | Kali Und Salz Ag, 3500 Kassel | Process for the electrostatic treatment of crude potash salts containing Kiesent |
-
1992
- 1992-01-07 DE DE4200167A patent/DE4200167C1/en not_active Expired - Lifetime
-
1993
- 1993-01-04 IT ITRM930001A patent/IT1261157B/en active IP Right Grant
- 1993-01-06 CA CA002086790A patent/CA2086790C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ITRM930001A0 (en) | 1993-01-04 |
| DE4200167C1 (en) | 1993-05-27 |
| IT1261157B (en) | 1996-05-09 |
| ITRM930001A1 (en) | 1994-07-04 |
| CA2086790A1 (en) | 1993-07-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI62471C (en) | ANRIKNING AV ICKE-SULFIDMINERAL MEDELST SKUMFLOTATION | |
| ES2656076T3 (en) | Procedure for treating phosphate minerals and use of a collector composition | |
| AU2018363890A1 (en) | Ore-dressing process | |
| CA2086790C (en) | A method for electrostatically processing crude salts at high levels of ambient humidity | |
| US4275847A (en) | Process for the treatment of aluminum-salt slags | |
| CA2138094C (en) | Method for processing kieserite concentrates containing langbeinite and anhydrite | |
| SU1433406A3 (en) | Method of electrostatic treatment of raw potassium salt | |
| US7635822B2 (en) | Method for treating ground crude potassium salts that contain kieserite | |
| DE3146295C1 (en) | Method of electrostatically separating ground potash ores | |
| SU1329613A3 (en) | Method of isolating potassium chloride from sylvinite concentrate | |
| US3480139A (en) | Recovery of kieserite from crude mineral salts | |
| DE3127946C1 (en) | Process for producing potassium salts | |
| US3760941A (en) | Process for preparing highly free flowing rock or table salt | |
| CA2086793C (en) | Sodium salicylate as a conditioning agent in the electrostatic processing of carnallite-containing crude potash salts | |
| CA2095670C (en) | Process for recovering carnallite and sylvite by electrostatic separation from carnallite-containing crude salts | |
| US3380666A (en) | Process for obtaining potash values from potash ore | |
| DE4025371C2 (en) | ||
| DE3825434C1 (en) | Obtaining useful substances from crude kieseritic potassium salt - comprises grinding, adding conditioning agent, charging salt triboelectrically, sepg. salt electrostatically etc. | |
| CA2057165C (en) | Method of improvement of the yield of electrostatic separation of salts | |
| CN109967225A (en) | Apatite mine ore-dressing technique | |
| CA1310610C (en) | Installation for conditioning and triboelectrically charging fine-grained mixtures of salts | |
| CA2019960C (en) | Process for treating mineral mixtures | |
| US3052349A (en) | Process for the beneficiation of sylvinite ore | |
| EP0266601B1 (en) | Process for preparing magnesium sulphates | |
| CA1333271C (en) | Procedure for the electrostatic processing of crude argillaceous salts |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20130107 |