CA1247306A - Process for agglomeration of mineral ore particles utilizing a mixture of hydroxyethylcellulose and sodium carbonate - Google Patents
Process for agglomeration of mineral ore particles utilizing a mixture of hydroxyethylcellulose and sodium carbonateInfo
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- CA1247306A CA1247306A CA000485897A CA485897A CA1247306A CA 1247306 A CA1247306 A CA 1247306A CA 000485897 A CA000485897 A CA 000485897A CA 485897 A CA485897 A CA 485897A CA 1247306 A CA1247306 A CA 1247306A
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- sodium carbonate
- mixture
- hydroxyethylcellulose
- ore
- present
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Abstract
Abstract A process for agglomerating mineral ore particles utilizing a binding amount of a mixture of hydroxyethylcellulose and sodium carbonate.
Description
~J ;~ j ~l2~730~
TITkE:, Proce~R for ~ lomer~tion of Mineral Ore Particles Utillz~n~ a ~lxtul~L~ LdroxYeehylcellulose ~nd Sodium C~rbonAt~
Field of the Invention Thls inventlon relates to ~ process for ~gglomerating or pell~tizlng miner~l ore particles by commingling the miner~l ore particles with a binding amount of ~ ~ixture of hydroxyethylcellulose and sodium c~rbonste. Thls lnventlon ~lso relates to pellets of minersl ore produced by ~uch ~ process.
B~ck~round o the Inventlon Certain mineral ores, ~uch as iron ore, must be reduced to finely divided p~rtlcles for the purpose of benificlation. It i3 often necessary to agglomer~te the~e partlcles to f~cilitate su`bsequent h~ndling ~nd storAge of the miner~l ore, e.g., ~or efficlent proce~ing in ~ bl~t ~urn~ce. This Qgglomer~tlon h~lps to pravent dusting, crumbling or c~kin8 o~ tha ore. The pellets, sinters or briquet~es thus formed ~rom thi~ ~gglomer~tlon proce~ should be porous and su~1ciently skrong enouKh ~o re~ist ~braslon ~nd crumbllng durlng s~or~ge and h~ndling.
Known methods ~gglomer~te the ore p~rtlcles wlth blnders such ~ hydroxyethylcellulose, bentonite clsy, ~ mixture of bentonite and ~ S08p, portl~nd cement, sodlum ~illc~te or a mixture of an ~lk~li s~lt of c~rboxymethyl-cellulose ~nd en ~lk~
metal salt. Use of these Xnown blnders, howev~r, i~
D-
TITkE:, Proce~R for ~ lomer~tion of Mineral Ore Particles Utillz~n~ a ~lxtul~L~ LdroxYeehylcellulose ~nd Sodium C~rbonAt~
Field of the Invention Thls inventlon relates to ~ process for ~gglomerating or pell~tizlng miner~l ore particles by commingling the miner~l ore particles with a binding amount of ~ ~ixture of hydroxyethylcellulose and sodium c~rbonste. Thls lnventlon ~lso relates to pellets of minersl ore produced by ~uch ~ process.
B~ck~round o the Inventlon Certain mineral ores, ~uch as iron ore, must be reduced to finely divided p~rtlcles for the purpose of benificlation. It i3 often necessary to agglomer~te the~e partlcles to f~cilitate su`bsequent h~ndling ~nd storAge of the miner~l ore, e.g., ~or efficlent proce~ing in ~ bl~t ~urn~ce. This Qgglomer~tlon h~lps to pravent dusting, crumbling or c~kin8 o~ tha ore. The pellets, sinters or briquet~es thus formed ~rom thi~ ~gglomer~tlon proce~ should be porous and su~1ciently skrong enouKh ~o re~ist ~braslon ~nd crumbllng durlng s~or~ge and h~ndling.
Known methods ~gglomer~te the ore p~rtlcles wlth blnders such ~ hydroxyethylcellulose, bentonite clsy, ~ mixture of bentonite and ~ S08p, portl~nd cement, sodlum ~illc~te or a mixture of an ~lk~li s~lt of c~rboxymethyl-cellulose ~nd en ~lk~
metal salt. Use of these Xnown blnders, howev~r, i~
D-
- 2 ^ ~ 7~6 sometlmes dlsadv~ntsgeous. For ln~itfince, the p~llets formed may l~ck ~u~lc~ent re~l~t~nce to abr~ion; or the p~llet~ m~y cont~in und~sir~ble level~ of contaminatlng compound~; or ~n undei~irably hlgh rstio o~ binder to ore msy be necess~ry fvr effeclent ag~lomer~tion.
Accordingly, it i8 an ob~ect of the present invention to provide 8 proces~ for ~gglomerQt~ng mineral ore particles ~hich does not iguffer from the disadvan~ges described ~bove. A p~rtlcular ob~ect of th$s lnventlon ls to provlde a novel proce~s for ~gglomer~ting mineral or~ p~rticlei~ whlch comprlses commingling the mineral ore partlcles with ~ binding ~mount o~ ~ mixture of hydroxyethylcellulosie and sodium c~rbonflte. Another obJect of this invention is to proYlde novel mlner~l ore pelleti~ produced by this procei~s.
DescrlPtl~o~of the~ Inven.tion This lnvention relates to ~ process ~or agglomer~tion o~ miner~l ore p~rticles whlch comprise~ commln~ling the mlneral ore p~rtioles with Q binding amount of ~ mlxture of hydroxyethylcellulose ~nd sodium carbon~te, ln the prei~ence oiE wster. The binding amount of the mlxture wlll v~ry dependlng upon the agglomer~tlon method to be used, the n~ture of the ore and the propertles desired in the pelletis of the miner~l ore thus formed. In gener&l the binding amount o~ the mixture wlll be an amount Rre~ter than about 0.01%, calcul~ted on the welght of the dry ore. For iron ore p~rtlcle agglomer~tion the prefer~ble amount of D-. .. , . . . ,. . . .... . . . . . . . . . ,. ~ .. . . ~ .. . . .. .. .. . . .. ..... . . . . .. . ... . ....
~ . .
.. ; .
G
~he ~lxtur~ r~s~r th~n ~bout O.O5S, ealculated on the weight of ~he dry ore.
In princ~el ~11 eype2 of ~sssn~islly ~ter-solubla hydroxyethylcellulo~e can be used to produce mlxture~ useful ln the proce~s of ~hls lnv~ntlon.
The ~lxture of hydroxyethylcel 1U1Q8e and sodium c~rbonate ç~n be usQd alone or ~n combinstlon ~l~h 8 ~uit~ble carrier~ ~ sult~ble c~rrisr for the purpo3e of thls inven~ion 18 ~ carrier which ls w~ter-dlsperssble snd which has no deleteriou~
~ffect on the blndlng o~ the mixture with the minersl ore. Sultable csrrier~ include clQy~, such ~s bentonite, gums, such ~ gu~r gum, complexin~
agents, ~uch as sodium tctrsborate, or other lnor~anlc ~Alts, ~uch ~s sodium chloride or c~lcium carbonste.
The mlxture oF hydroxyethylcellulose ~nd sodlum cQrbon~te cont~lns sodium c~rbon~te in an AmoUnt o ~t le~t 2~, prefer~bly 8re~ter th~n 25~, c~lculated on the total weight of the mixture.
Prefer~b~y the concentr~tlon of sodlum carbonate will vflry ~rom ~bout 25~ to sbout 75~, more pre~erAbly From ~out 30~ to 6S% ~nd mo3t prefer~bly from ~bout 40~ to ubout 60~, c~lcul~ted on the total weight of th~ mixture of hydroxye~hylcellulose and ~odlum carbonate.
The weter present in the agglomerstion mixture m~y be ad~usted durln~ or prlor to ~ddltion of the mixture of hydroxyethylcellulose ~nd sodium carbonate eo the ore. The ~mount of wster present 18 the amount necessary for sflt~f~ctory ~gglomerstlon. This amount wlll vary dependln~ cn D-.. . ,. . . . . . ... . ... . . .. . . . ,~. . . .. .. . . .. . . , . ~ . . ~ .. .. . . . . ..
~L2~L7306 '` ) ~ype of miner~l ore u~ed snd the desired propertles o~ the QgglomerQt~d ore particles but, in general, 18 equal to or ~rester than ~bout 5~ o the ~et mlxture. Pre~er~bly the ~mount o~ ~ter r~nge~ from about 5S to ~bout 20S of the wet mixture. For proper pI59ticlty of lron ore pellet~ the pre~erred amount of w~ter r~nges from about 7~ to ~bout 12S of the wet mixture.
Commlngling the miner~l ore pArticles wi~h the mixture 3f hydroxyethylcellulQse and ~odium c~rbonate can be ~ccomplished in any mRnner commonly used for ~gglomer~tion purposes, ~uch ~s in convention~l disc pelletizer or rolling drum pelletizer, or in a roll press.
The pellet~ thus formed ~re referred to ~s "green" or "r~w" pellets. These pellets possess limited ~mount o~ structur~l ~trength.
Con~quantlyl the green pellets ~re then dried for about 0~5 hour to Rbout 24 hour~, pre~erubly from about l hour to ~bout 2 hours, ~t elevated temper~ture~, preeerQbly between ~bout 100C to ~bout 300C. During this drylng st~p the pellets reach their m~ximum ~tren~th. The strength and qu~lity o~ ~he ore pellet is usually ch~r~cterlzed by quantlties ~uch a8 drop number and compressive 8 tren8th.
The present invention will be further described in the following ex~mples.
Example I
Equ~l ~mounts by weight of hydroxyethylcellulose (solutlon viscoslty of 6000 centlpoise ~ me~sured on a 1~ aqueous solution on 3 D- ~
.
c~ c~
Brookfield Vi~cometer on ~ ~o. 4 splndle ~t 30 rpm) ~nd sodium csrbon~te were uniformly mixed in ~ twin ahell blender to be u~ed ~8 the binder composi~ion.
Finely dlvlded iron ore pertieles were initi~lly homogenlzed ~nd moisturized wlth w~ter in drum until the moi~ture content of the ore w~s ~bout 4~0 Sample~ ~30 Kg. e~ch) of the moistened ore were m~nuslly mlxed with v~rious smounta of the binder composition for one minute And then uniformly fed into a di~c pelletizer. W~ter was ~ed to the disc by ~ proportloning pump through two spr~ys to att~in the deaired percentage of mo~sture in the pellets ~see T~ble I).
The pellets thus produced ran8ed ln size from lO to 14 ~m. The "green" pellets for e~ch re~pectlve concentr~tion of binder ~nd w~ter were segmented into lot~ of 15 each for testing:
I. Drop Test This te~t consl~ted oP droppin~ the green pelle~ ~rom ~ height o 450mm onto an lron b~se.
The ~ver~ge number o~ drop~ requlred to c~use ~r~cture of ~he 15 pellets in the lot is the drop number.
II. Compres~lve Stren~th A. Green Pellets Thl~ t~t conslsted of loading each pellet to breakage with the ald o~ a hydraulic pres~ moving at ~ const~nt speed of 50mm/min. The number ~epresents the aver~ge compresslve strength 1n 8r~ms required to bre~k the pellet~ o~ e~ch lot.
~ . Dry Pellet~
D-~, . .
(~ 124r730~
Green pellet~ produc~d by the ~gglo~er~tlon process were plscQd in ~n oven and drled ~or 2 hours ~t about llO~C, ~nd then sub~eet~d to the compres~ive strength test de~crlbed above.
The result~ of these te~ts are summ~rized In r~ble 1.
D-.
_ . .
TABLE I
Qu~1ity of Pe11e~s Wlth and Without Binder tlS P~ t8 er t@st?
Compre~ive Te~t Binder* Drop Stren~th(R) No. ~dditlon Moi~ture Number Green Dry .
1 0 7.5~ 2.00 450 600 2 ~ 8.30 2.00 620 820
Accordingly, it i8 an ob~ect of the present invention to provide 8 proces~ for ~gglomerQt~ng mineral ore particles ~hich does not iguffer from the disadvan~ges described ~bove. A p~rtlcular ob~ect of th$s lnventlon ls to provlde a novel proce~s for ~gglomer~ting mineral or~ p~rticlei~ whlch comprlses commingling the mineral ore partlcles with ~ binding ~mount o~ ~ mixture of hydroxyethylcellulosie and sodium c~rbonflte. Another obJect of this invention is to proYlde novel mlner~l ore pelleti~ produced by this procei~s.
DescrlPtl~o~of the~ Inven.tion This lnvention relates to ~ process ~or agglomer~tion o~ miner~l ore p~rticles whlch comprise~ commln~ling the mlneral ore p~rtioles with Q binding amount of ~ mlxture of hydroxyethylcellulose ~nd sodium carbon~te, ln the prei~ence oiE wster. The binding amount of the mlxture wlll v~ry dependlng upon the agglomer~tlon method to be used, the n~ture of the ore and the propertles desired in the pelletis of the miner~l ore thus formed. In gener&l the binding amount o~ the mixture wlll be an amount Rre~ter than about 0.01%, calcul~ted on the welght of the dry ore. For iron ore p~rtlcle agglomer~tion the prefer~ble amount of D-. .. , . . . ,. . . .... . . . . . . . . . ,. ~ .. . . ~ .. . . .. .. .. . . .. ..... . . . . .. . ... . ....
~ . .
.. ; .
G
~he ~lxtur~ r~s~r th~n ~bout O.O5S, ealculated on the weight of ~he dry ore.
In princ~el ~11 eype2 of ~sssn~islly ~ter-solubla hydroxyethylcellulo~e can be used to produce mlxture~ useful ln the proce~s of ~hls lnv~ntlon.
The ~lxture of hydroxyethylcel 1U1Q8e and sodium c~rbonate ç~n be usQd alone or ~n combinstlon ~l~h 8 ~uit~ble carrier~ ~ sult~ble c~rrisr for the purpo3e of thls inven~ion 18 ~ carrier which ls w~ter-dlsperssble snd which has no deleteriou~
~ffect on the blndlng o~ the mixture with the minersl ore. Sultable csrrier~ include clQy~, such ~s bentonite, gums, such ~ gu~r gum, complexin~
agents, ~uch as sodium tctrsborate, or other lnor~anlc ~Alts, ~uch ~s sodium chloride or c~lcium carbonste.
The mlxture oF hydroxyethylcellulose ~nd sodlum cQrbon~te cont~lns sodium c~rbon~te in an AmoUnt o ~t le~t 2~, prefer~bly 8re~ter th~n 25~, c~lculated on the total weight of the mixture.
Prefer~b~y the concentr~tlon of sodlum carbonate will vflry ~rom ~bout 25~ to sbout 75~, more pre~erAbly From ~out 30~ to 6S% ~nd mo3t prefer~bly from ~bout 40~ to ubout 60~, c~lcul~ted on the total weight of th~ mixture of hydroxye~hylcellulose and ~odlum carbonate.
The weter present in the agglomerstion mixture m~y be ad~usted durln~ or prlor to ~ddltion of the mixture of hydroxyethylcellulose ~nd sodium carbonate eo the ore. The ~mount of wster present 18 the amount necessary for sflt~f~ctory ~gglomerstlon. This amount wlll vary dependln~ cn D-.. . ,. . . . . . ... . ... . . .. . . . ,~. . . .. .. . . .. . . , . ~ . . ~ .. .. . . . . ..
~L2~L7306 '` ) ~ype of miner~l ore u~ed snd the desired propertles o~ the QgglomerQt~d ore particles but, in general, 18 equal to or ~rester than ~bout 5~ o the ~et mlxture. Pre~er~bly the ~mount o~ ~ter r~nge~ from about 5S to ~bout 20S of the wet mixture. For proper pI59ticlty of lron ore pellet~ the pre~erred amount of w~ter r~nges from about 7~ to ~bout 12S of the wet mixture.
Commlngling the miner~l ore pArticles wi~h the mixture 3f hydroxyethylcellulQse and ~odium c~rbonate can be ~ccomplished in any mRnner commonly used for ~gglomer~tion purposes, ~uch ~s in convention~l disc pelletizer or rolling drum pelletizer, or in a roll press.
The pellet~ thus formed ~re referred to ~s "green" or "r~w" pellets. These pellets possess limited ~mount o~ structur~l ~trength.
Con~quantlyl the green pellets ~re then dried for about 0~5 hour to Rbout 24 hour~, pre~erubly from about l hour to ~bout 2 hours, ~t elevated temper~ture~, preeerQbly between ~bout 100C to ~bout 300C. During this drylng st~p the pellets reach their m~ximum ~tren~th. The strength and qu~lity o~ ~he ore pellet is usually ch~r~cterlzed by quantlties ~uch a8 drop number and compressive 8 tren8th.
The present invention will be further described in the following ex~mples.
Example I
Equ~l ~mounts by weight of hydroxyethylcellulose (solutlon viscoslty of 6000 centlpoise ~ me~sured on a 1~ aqueous solution on 3 D- ~
.
c~ c~
Brookfield Vi~cometer on ~ ~o. 4 splndle ~t 30 rpm) ~nd sodium csrbon~te were uniformly mixed in ~ twin ahell blender to be u~ed ~8 the binder composi~ion.
Finely dlvlded iron ore pertieles were initi~lly homogenlzed ~nd moisturized wlth w~ter in drum until the moi~ture content of the ore w~s ~bout 4~0 Sample~ ~30 Kg. e~ch) of the moistened ore were m~nuslly mlxed with v~rious smounta of the binder composition for one minute And then uniformly fed into a di~c pelletizer. W~ter was ~ed to the disc by ~ proportloning pump through two spr~ys to att~in the deaired percentage of mo~sture in the pellets ~see T~ble I).
The pellets thus produced ran8ed ln size from lO to 14 ~m. The "green" pellets for e~ch re~pectlve concentr~tion of binder ~nd w~ter were segmented into lot~ of 15 each for testing:
I. Drop Test This te~t consl~ted oP droppin~ the green pelle~ ~rom ~ height o 450mm onto an lron b~se.
The ~ver~ge number o~ drop~ requlred to c~use ~r~cture of ~he 15 pellets in the lot is the drop number.
II. Compres~lve Stren~th A. Green Pellets Thl~ t~t conslsted of loading each pellet to breakage with the ald o~ a hydraulic pres~ moving at ~ const~nt speed of 50mm/min. The number ~epresents the aver~ge compresslve strength 1n 8r~ms required to bre~k the pellet~ o~ e~ch lot.
~ . Dry Pellet~
D-~, . .
(~ 124r730~
Green pellet~ produc~d by the ~gglo~er~tlon process were plscQd in ~n oven and drled ~or 2 hours ~t about llO~C, ~nd then sub~eet~d to the compres~ive strength test de~crlbed above.
The result~ of these te~ts are summ~rized In r~ble 1.
D-.
_ . .
TABLE I
Qu~1ity of Pe11e~s Wlth and Without Binder tlS P~ t8 er t@st?
Compre~ive Te~t Binder* Drop Stren~th(R) No. ~dditlon Moi~ture Number Green Dry .
1 0 7.5~ 2.00 450 600 2 ~ 8.30 2.00 620 820
3 200 7.51 ~.87 600 830
4 200 7.87 1.80 670 840 200 8.03 2.00 840 950 6 ~00 8.26 2.40 740 910 7 200 8.37 2.13 830 970 8 200 8.52 ~.60 980 1150 9 350 7.95 2.27 830 1460 400 7.73 2.20 ~50 1310 11 400 7.80 1.87 730 1260 12 400 8.20 2.93 1010 1450 13 400 ~.38 3.67 1180 1500 14 4S0 8.13 2.60 810 1q60 ~00 7.70 2.13 800 1810 16 600 7.93 2.60 900 1690 17 600 8.13 3.07 900 1540 18 600 8.60 4.33 720 1960 19 6~0 8.79 4.13 980 1930 600 9.05 2.67 7~0 1470 21 1000 8.41 3.53 750 36gO
22 lS00 8.70 7.20 ~30 5190 * Grdm~ of the S0/50 blend of hydroxyethyl ccllulo~e Qnd ~odlum c~rbon~to per ton of lron ore ~.
~......
.
~3 The ~rocedure de~crib~d abo~ W88 repe~ted u~nR ~ mixture of b~ntonl~e clay ~nd the binding composition as the pelletl2in~ ~ent. The resul~
o~ thls ~3t ~re summ~rized in T~ble II.
ABLE II*
QualitY of Pellets Produced With Bentonite Addition Compressi~e Binder ~nd Moi~ture Drop Stren~h~L
Bentonite~ (S) Number Green Dry (~/t~
Bentonite 1700 8.53 2.07 8~0 1850 Binder .
* 15 pellets te~ted Gr~m~ o ~entonite ~nd binder per ton of iron ore The ~ollowing binding compositlons were prep~red by uniPormly mixln~ the lngredlent~
~percent~ges Qre all ~y welght):
A. S0~ hydroxyethylcellulose (HEC I) (BolUtion v18c081ty of 6000 centipoise flS measured on a 1~ aqueous solutlon on ~ Brookfield V1BCOmeter On ~ NO .
~pindle ~t 30 rpm) 50~ sod~um c~rbon~te B. 50~ hydroxyethylcellulose (HEC II) (solutlon viscoslty of 300 centlpoi~e ~g me~sured on ~ 2~ ~queous solutlon D-~L2~736[~
9 .
on a Broo~fleld ~i~comet~r on a N0. 2 ~pindle ~t 60 rpm) 50~ sodlum c~rbon~te C~ 35~ HEC I
65~ ~odium c~rbon~te D. 25~ HEC I
25S Guær gum 50~ sodium osrbon~te Finely dividsd taoonlte ore particles (-8.5~ moi~ture) were mix~d with one o~ the b~nd~ng eompositlon described ~bove for each tes~.
Concentr~tlon ~f the b1ndins composition for ~11 tests w~s 1.55 pounds per ton of t~conlte ore~
After mixlng, the ore plus bindlng composition w~s uni~ormly fed into ~ rotating b~lllng tlre for pelletizlng. W~ter W8~ sdded ~s requlred a~ ~n ~tomized mi~t. The pellet~ thus formed ran8ed in size ~rom 12-14mm~ The pellet3 were then segmented into lots of 20 e~ch for testlng.
I. Drop T~t A. Green pellets ~ me test ~8 da~crlbed in Example I except th~t the psllet~ were dropped from a hel~h~ of 18 inchcs.
9. Dry Pellet~
Green pellet~ were pl~ced ln ~n oven ~nd dried for 30 minutes at 350 F ( 176C). The dried pellets were then sub~ected to the drop teRt described above.
II. Compres~ive Strength A. Green Pellets Thls te~t eonsiQted of lo~dlng e~ch pellet to bre~k~g~ u~1ng a Ch~tillon Spring Te~ter of 25 D-C~ ~2~73~6 ~) lb. r~nge ~t ~ const~nt ~peed of 0.1 ~n./sec. The number repres~nts the ~ver~ge compressive strength ~n pounds required to br~k the pellet of ~ach lo~.
B. Dry Pellets Gr~en pellets were pl~ced ln ~n oven and dried for 30 ~inute~ ~t 35QFt~176C). The dried pellets ~ere ~hen sub3ected to the compre~sive strength test described ~bove.
The re~ults of the~e tests are summ~rized in T~BLE III.
TABLE III
Qu~llty of Pellets UsinR Dlfferent ~indin~ ComPositions (Aversge o~ 20 pellet~ per test) Bindin8 Compresslve Compo- Moisture Drop Number _StrenRth* _ ~ition ~ Green DrY Green DrY
A - 3.65 2.76 3.57 4.54 B 8.7g 3.45 2.55 3.39 4.52 C ~.49 2.61 2.15 3.06 3.23 D 8.07 3.36 3.65 3.16 4.35 * ~veruge compre~sive strength ln pounds - Not determlned EXAIIPLE I I I
~ lnding compo~ltlons comprising varlou~
blends o hydroxyethylcellulose (solution vlscosl~y of 6000 centlpoise ~s me~ured on ~ queous ~olution on 8 Brookfield Vlscometer on s No. 4 splndle st 30 rpm) Rnd ~odlum csrbons~e were ., D-73~
pr~p~red by unlformly ~ixlng the hydroxyethylcellulose and sod~um c~rbon~te ~8 ~ollows ~perc~nt~ges sre Rll by wei~ht):
E. 50S hydroxye~hylcellulo~e 50S sodium cflrbonate F. 6Q~ hydroxyethylcellulose 40~ ~odium c~r~on~te G. 75S hydroxyethylcellulo~e 25~ sodlum c~rbonate H. lO0~ hydroxyethylcellulo~e 0~ ~odium carbonste Finely dlvlded t~conlte ore partlcles (~8.5~ molsture) were mixed wlth one o~ ~he binding compositions descrlbed above ~or each test.
Concentratlon of the blnding composition in the ore varled for each composition but the percentage of hydroxyethylcellulose ln ~he ore remalned the same, i.e., 0.78 lbs~ per metrle ton o ore. A~ter mixing, the ore plu~ blnding compo31tion wa~
pelletized ~nd te~ted a8 described in Example II.
The re~ults o~ these te~ts ~re ~umm~rlzed in T~ble XV.
D-73~
T~BLE_IV
Qu~lltY of P~ t~ Usin8_Different Bl~nds of Hydroxyeth~lcellulo~ and Sodlum C~rbon~te as Blnders*
LBSI - ColDpre~give BindingMetric DroP Number Str~n8~h(LBS)Moisture ComPosltion Ton W~t DrY Wet Dry_ E 1.55 3.2 2.9 3.5 4.8 8.3 F 1.30 3.1 ~.1 3.3 3.5 8.6 G 1.04 3.7 2.0 3.1 2.9 8.7 H 0.78 3.6 2.0 3.5 3.1 8.3 *Average o~ 20 pellets per te~t The proce~s of this invention 1~ pre~ersbly employed for iron-containing ores and ore concentrates~
~uch ~s magnetlte and hematlte concentra~es, natural ore~
~nd pyrite resldue& but the process is al~o suitsble for use with non-ferrous ore mQterlsls.
Although the method of thls lnvention h~s been described generslly ~or prepar~tion o pelle~s of minersl ore, lt will be under~tood by those skllled ln the art that ~his method 18 equally uppllcable for the prepuration of other ~gglomerated form~, such as briquettes ~nd ~inters.
D-
22 lS00 8.70 7.20 ~30 5190 * Grdm~ of the S0/50 blend of hydroxyethyl ccllulo~e Qnd ~odlum c~rbon~to per ton of lron ore ~.
~......
.
~3 The ~rocedure de~crib~d abo~ W88 repe~ted u~nR ~ mixture of b~ntonl~e clay ~nd the binding composition as the pelletl2in~ ~ent. The resul~
o~ thls ~3t ~re summ~rized in T~ble II.
ABLE II*
QualitY of Pellets Produced With Bentonite Addition Compressi~e Binder ~nd Moi~ture Drop Stren~h~L
Bentonite~ (S) Number Green Dry (~/t~
Bentonite 1700 8.53 2.07 8~0 1850 Binder .
* 15 pellets te~ted Gr~m~ o ~entonite ~nd binder per ton of iron ore The ~ollowing binding compositlons were prep~red by uniPormly mixln~ the lngredlent~
~percent~ges Qre all ~y welght):
A. S0~ hydroxyethylcellulose (HEC I) (BolUtion v18c081ty of 6000 centipoise flS measured on a 1~ aqueous solutlon on ~ Brookfield V1BCOmeter On ~ NO .
~pindle ~t 30 rpm) 50~ sod~um c~rbon~te B. 50~ hydroxyethylcellulose (HEC II) (solutlon viscoslty of 300 centlpoi~e ~g me~sured on ~ 2~ ~queous solutlon D-~L2~736[~
9 .
on a Broo~fleld ~i~comet~r on a N0. 2 ~pindle ~t 60 rpm) 50~ sodlum c~rbon~te C~ 35~ HEC I
65~ ~odium c~rbon~te D. 25~ HEC I
25S Guær gum 50~ sodium osrbon~te Finely dividsd taoonlte ore particles (-8.5~ moi~ture) were mix~d with one o~ the b~nd~ng eompositlon described ~bove for each tes~.
Concentr~tlon ~f the b1ndins composition for ~11 tests w~s 1.55 pounds per ton of t~conlte ore~
After mixlng, the ore plus bindlng composition w~s uni~ormly fed into ~ rotating b~lllng tlre for pelletizlng. W~ter W8~ sdded ~s requlred a~ ~n ~tomized mi~t. The pellet~ thus formed ran8ed in size ~rom 12-14mm~ The pellet3 were then segmented into lots of 20 e~ch for testlng.
I. Drop T~t A. Green pellets ~ me test ~8 da~crlbed in Example I except th~t the psllet~ were dropped from a hel~h~ of 18 inchcs.
9. Dry Pellet~
Green pellet~ were pl~ced ln ~n oven ~nd dried for 30 minutes at 350 F ( 176C). The dried pellets were then sub~ected to the drop teRt described above.
II. Compres~ive Strength A. Green Pellets Thls te~t eonsiQted of lo~dlng e~ch pellet to bre~k~g~ u~1ng a Ch~tillon Spring Te~ter of 25 D-C~ ~2~73~6 ~) lb. r~nge ~t ~ const~nt ~peed of 0.1 ~n./sec. The number repres~nts the ~ver~ge compressive strength ~n pounds required to br~k the pellet of ~ach lo~.
B. Dry Pellets Gr~en pellets were pl~ced ln ~n oven and dried for 30 ~inute~ ~t 35QFt~176C). The dried pellets ~ere ~hen sub3ected to the compre~sive strength test described ~bove.
The re~ults of the~e tests are summ~rized in T~BLE III.
TABLE III
Qu~llty of Pellets UsinR Dlfferent ~indin~ ComPositions (Aversge o~ 20 pellet~ per test) Bindin8 Compresslve Compo- Moisture Drop Number _StrenRth* _ ~ition ~ Green DrY Green DrY
A - 3.65 2.76 3.57 4.54 B 8.7g 3.45 2.55 3.39 4.52 C ~.49 2.61 2.15 3.06 3.23 D 8.07 3.36 3.65 3.16 4.35 * ~veruge compre~sive strength ln pounds - Not determlned EXAIIPLE I I I
~ lnding compo~ltlons comprising varlou~
blends o hydroxyethylcellulose (solution vlscosl~y of 6000 centlpoise ~s me~ured on ~ queous ~olution on 8 Brookfield Vlscometer on s No. 4 splndle st 30 rpm) Rnd ~odlum csrbons~e were ., D-73~
pr~p~red by unlformly ~ixlng the hydroxyethylcellulose and sod~um c~rbon~te ~8 ~ollows ~perc~nt~ges sre Rll by wei~ht):
E. 50S hydroxye~hylcellulo~e 50S sodium cflrbonate F. 6Q~ hydroxyethylcellulose 40~ ~odium c~r~on~te G. 75S hydroxyethylcellulo~e 25~ sodlum c~rbonate H. lO0~ hydroxyethylcellulo~e 0~ ~odium carbonste Finely dlvlded t~conlte ore partlcles (~8.5~ molsture) were mixed wlth one o~ ~he binding compositions descrlbed above ~or each test.
Concentratlon of the blnding composition in the ore varled for each composition but the percentage of hydroxyethylcellulose ln ~he ore remalned the same, i.e., 0.78 lbs~ per metrle ton o ore. A~ter mixing, the ore plu~ blnding compo31tion wa~
pelletized ~nd te~ted a8 described in Example II.
The re~ults o~ these te~ts ~re ~umm~rlzed in T~ble XV.
D-73~
T~BLE_IV
Qu~lltY of P~ t~ Usin8_Different Bl~nds of Hydroxyeth~lcellulo~ and Sodlum C~rbon~te as Blnders*
LBSI - ColDpre~give BindingMetric DroP Number Str~n8~h(LBS)Moisture ComPosltion Ton W~t DrY Wet Dry_ E 1.55 3.2 2.9 3.5 4.8 8.3 F 1.30 3.1 ~.1 3.3 3.5 8.6 G 1.04 3.7 2.0 3.1 2.9 8.7 H 0.78 3.6 2.0 3.5 3.1 8.3 *Average o~ 20 pellets per te~t The proce~s of this invention 1~ pre~ersbly employed for iron-containing ores and ore concentrates~
~uch ~s magnetlte and hematlte concentra~es, natural ore~
~nd pyrite resldue& but the process is al~o suitsble for use with non-ferrous ore mQterlsls.
Although the method of thls lnvention h~s been described generslly ~or prepar~tion o pelle~s of minersl ore, lt will be under~tood by those skllled ln the art that ~his method 18 equally uppllcable for the prepuration of other ~gglomerated form~, such as briquettes ~nd ~inters.
D-
Claims (12)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:
1. A process for agglomerating mineral ore particles which comprises commingling the mineral ore particles with mixture of water-soluble hydroxyethylcellulose and sodium carbonate, in the presence of water, said sodium carbonate comprising from about 2 to about 75 weight percent of the mixture, and said mixture being present in amounts of at least 0.01 weight percent based upon the weight of the mineral ore.
2. A process as recited in claim 1, wherein the sodium carbonate is present in an amount of from about 25 to 75 weight percent, calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
3. A process as recited in claim 1 wherein the sodium carbonate is present in an amount of from about 30 to about 60 weight percent, calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
4. A process as recited in claim 1, wherein the sodium carbonate is present in an amount of from about 40 to about 60 weight percent calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
5. A process as recited in claim 1 wherein the mineral ore is iron ore.
6. A process as recited in claim 5, wherein the mixture of hydroxyethylcellulose and sodium carbonate is present in an amount great than about 0.05%, calculated on the dry weight of the iron ore.
7. An agglomerated ore product comprising mineral ore particles and a mixture of water-soluble hydroxyethylcellulose and sodium carbonate, wherein said sodium carbonate comprises from about 2 to about 75 weight percent said mixture, and wherein said mixture is present in amounts of at least 0.01% based upon the weight of the mineral ore.
8. A process as recited in claim 1, wherein the sodium carbonate is present in an amount of from about 25 to 75 weight percent, calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
9. A process as recited in claim 1 wherein the sodium carbonate is present in an amount of from about 30 to about 60 weight percent, calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
10. A composition for agglomerating mineral ore particles comprising water-soluble hydroxyethylcellulose and sodium carbonate, said sodium carbonate being present in amounts of from about 2 to about 45 weight percent based upon the total weight of the mixture.
11. A process as recited in claim 1, wherein the sodium carbonate is present in an amount of from about 25 to 75 weight percent, calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
12. A process as recited in claim 1 wherein the sodium carbonate is present in an amount of from about 30 to about 60 weight percent, calculated on the total weight of the mixture of hydroxyethylcellulose and sodium carbonate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US67328684A | 1984-11-20 | 1984-11-20 | |
| US673,286 | 1984-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1247306A true CA1247306A (en) | 1988-12-28 |
Family
ID=24702026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000485897A Expired CA1247306A (en) | 1984-11-20 | 1985-06-28 | Process for agglomeration of mineral ore particles utilizing a mixture of hydroxyethylcellulose and sodium carbonate |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU586437B2 (en) |
| CA (1) | CA1247306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013166575A1 (en) | 2012-05-09 | 2013-11-14 | Vale S.A. | Process for obtaining carboxymethyl cellulose from agro-industrial residues and carboxymethyl cellulose and use thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1332514C (en) * | 1985-05-21 | 1994-10-18 | Meyer Robert Rosen | Process for agglomerating mineral ore concentrate utilizing emulsions of polymer binders or dry polymer binders |
| CA1332515C (en) * | 1985-05-21 | 1994-10-18 | Gregory John Dornstauder | Process for agglomerating mineral ore concentrate utilizing emulsions of polymer binders or dry polymer binder |
| US4863512A (en) * | 1987-06-29 | 1989-09-05 | Aqualon Company | Binder for metal-containing ores |
| US4948430A (en) * | 1989-06-15 | 1990-08-14 | Aqualon Company | Ore pellets containing carboxymethylhydroxyethylcellulose and sodium carbonate |
| CA2082128C (en) | 1991-11-07 | 2002-12-31 | Henricus R. G. Steeghs | Process for agglomerating particulate material and products made from such processes |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL187123C (en) * | 1975-11-20 | 1991-06-03 | Akzo Nv | METHOD FOR AGGLOMERATING ORE MATERIALS |
-
1985
- 1985-06-28 CA CA000485897A patent/CA1247306A/en not_active Expired
- 1985-08-22 AU AU46544/85A patent/AU586437B2/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013166575A1 (en) | 2012-05-09 | 2013-11-14 | Vale S.A. | Process for obtaining carboxymethyl cellulose from agro-industrial residues and carboxymethyl cellulose and use thereof |
| US9266968B2 (en) | 2012-05-09 | 2016-02-23 | Vale S.A. | Process for obtaining carboxymethyl cellulose from agro-industrial residues and carboxymethyl cellulose and use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| AU4654485A (en) | 1986-05-29 |
| AU586437B2 (en) | 1989-07-13 |
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