derrick screen project.docx
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The Department of Chemical & Metallurgical EngineeringPrivate Bag X680Pretoria0001Tel. 01!" #8! 6#6$ % 6!$ %#'(')a*. 01!" #8! 6!'
Monthly Report: Work Integrated LearningMonth +o., 7 Date, )rom%To 22/06/14 to 18/07/14
Emplo-er +ame, MINP!" #$%&IRI&' PL$(IN&M MIN! )1*
tu/ent nitial an/ urname, (P '+IL!N,!
tu/ent +um2er, 212046710
tu/ent e3mail, the-.ihilenge0g-ailo-
tu/ent Cell +o, 0783600060
Mentor e3mail, ideriknel-inope5oa / 0!##((8#$
Decription of ta4 complete/ 2- tu/ent
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Table of ContentsMonthly Report: Work Integrated Learning..............................................................1
1.1DEFINITION PURPOE OF IE!IN" #ND $REENIN"..............................................%
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&.T'EOR(................................................................................................................... )
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1.1DEFINITION PURPOSE OF SIEVING AND SCREENING
$ ie?e i a -aterial Bhih i Ced to eparate @ine aggregate o@ a -i5tCre o@
aggregate Bhih ?ary in ie Bhih Bill eparate .ig aggregate @ro- -aller one It-otly eparate partile aording to ie D CeE@Cll prodCt @ro- Cele oneF likeBhen e5trating o-e -ineral @ro- ore in -ining indCtrie and -ineral proeingindCtrieD here at MINP!" )1 it Ced to lai@y the grinded prodCt o only theorret ie o@ 106 -iron .y ie are ent to the doBntrea- proe #eondaryroCgher @loatation*
1.2 BACKROUND
'reening and ie?ing are i-portant -ineral proeing operation (hey rely on
eparation o@ partile aording to their ie (he di@@erene .etBeen the- i thatreening i a ontinCoC operation Bhile ie?ing i a .ath ation and i CCallyper@or-ed a la. tet 'reening in per@or-ed Cing reen eGCipped Bith one or tBoreen Cr@ae alled alo dek $ ingle reen pro?ide tBo prodCt (he prodCt@ro- the top i alled the oversize or plC prodCt Bhile the one Bhih pae throCghthe reen i the undersize or -inC prodCt Material paing one reen Cr@ae .Ctre-aining on the ne5t one in a doC.le dek reen i an inter-ediate prodCt
1.2.1OBJECTIVES
(he di?iion o@ an ore trea- into tBo or -ore ie lae(o pre?ent @eeding Cnderie to the -ill or @eeding o?erie to the @loatation etioninreaing apaity H e@@iieny(o lai@y the grinded prodCt o only the orret ie i ent to the doBntrea-proe
'ie ditri.Ction i ?ery i-portant to the per@or-ane o@ a -aterial It -ay .e applied inrChed partileD and etD it i the -ot popClar and heap Bay o@ eparatingtehniGCe (he @Cntion o@ a -ehanial haker i to -ake the proe @ater .yapplying Bork to the ie?e
1.PICTURES OF E!UIP"ENTS USED
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2.T#EOR$
2.1.SIEVE ANA%$SIS
'ie?e analyi i the proe o@ di?iding a a-ple o@ aggregate into @ration o@ the a-eie (he pCrpoe o@ doing thi analyi i to deter-ine the grading or ie ditri.Ctiono@ the aggregate Bhih i i-portant to @ind oCt Bhether the aggregate pile Be aretCdying i good @or the -i5 or not (he grading o@ the aggregate CCally a@@et on theBorka.ility o@ the @reh onrete(he aggregate o@ interet i throBn into a erie o@
ie?e neted in order Bith the -allet at the .otto-D and a@ter haking the -a o@retained aggregate in eah ie?e i alClated(he aggregate Ced in the pro>et hoCld.e repreentati?e to the pile Be o.tained it @ro-D o Be anFt >Ct take the -a Beneed @or the the pro>et ar.itrary .eaCe thi ar.itrary pei-en -ight not ontain aertain ie o@ the aggregate et
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.1DEFINITION OF SCREENING AND SIEVING
'ie?ing re@er to the eparation o@ a -i5tCre o@ partile o@ di@@erent ie Cing ie?e
eah Bith a Cni@or- ied opening 'tandard ie?e o@ pei@ied opening ie areCed 'ie?e are taked Bith the ie?e Bith the larget opening on the top and the-aterial i eparated into @ration .y haking (he -aterial .etBeen tBo ie?e i-aller than the Cpper ie?e opening .Ct larger than the -aller ie?e opening9J
(he -a o@ prodCt an .e e5preed in i-ple -a Cnit #gD kgD Mg* or a trea-#@lC5* in -a per Cnit ti-e #@or intane -ega gra- per dayD or hortly Mg/d* Cringideal reeningD the plC prodCt ontain only partile greater than the ie o@opening o@ the reen Cr@ae Bhile -inC prodCt onit o@ partile -aller thanthe opening In real operation the o?eried partile are preent in the -inC prodCt
and o-e Cnderied partile are in the plC prodCt It reClt @ro- adheion o@ -allpartile to large one and that o-e partile ne?er get into ontat Bith the reenCr@ae (he preene o@ large partile in the Cnderie prodCt -ay .e aCed .ygreater than no-inal opening or rCptCre o@ the reen Cr@ae
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& PROCEDURE AND "ET#ODO%OG$
&.1 ob'e(t)*e of t+)s ,-o'e(tto tet the operating e@@iieny o@ the errik reen and lai@ying the -aterial
aording to ie o that only the orret ie o@ 106 -iron i ent to the eondary
roCgher ell and to i-pro?e the grinde in the eondary .all -ill ine the errik
reen get it @eed @ro- the .all -ill diharge
&.2 es(-),t)on of t+e ,-a(t)(al
• $ a-ple Ba olleted @ro- !RRI) 'R!!N thi Ba to tet i@ the reen i
operating orretly and it @ed Bith the orret @eedD Be Ct the a-ple @ro- thereen @eedD the Cnderie and the o?erie We la.eled D dated and tagged eaha-ple then prepared .y @irtly @iltrating Cntil no Bater Ba liking then dried thea-pleD drying i ?ery i-portant a it re-o?e all the Bater o that the a-ple an
.e plitD rChed and pCl?eried -ore eaily than i@ it i Bet It i ?ery i-portant thatthe o?en .e kept at the reGCired te-peratCre o that the a-ple i not hanged .ythe heat (he Bet a-ple Bill alo inter@ere Bith any Beighing done .eaCe theBeight @oCnd BoCld .e the Beight o@ the -oitCre and the a-ple and Be only needthat o@ a a-ple We le@t the a-ple to dry @or appro5i-ately 1 hoCr in the -iddlinggrade o?en
• (ook the- oCt o@ the o?en the a-ple are on the -etal pan and Be only going to
analy 230 to 900g depending on the a-pleD o the plitter Ba Ced to redCe the-a o@ a a-ple ine Be had -oreD (he a-ple Ba di?ided into portion o@ eGCal-a and eah portion i e5atly the a-e a the original a-pleD thi -eant that
eah portion ha the a-e harateriti We plit a a-ple .eaCe Be onlyneeded a ertain -a .Ct Be needed o-poition to .e the a-e a the originala-ple 10EBay plitterK thi type o@ plitter i knoBn a a etorial di?ider It onito@ a irClar hopper throCgh Bhih the -aterial @all into ontainer on a rotatingaroCel
• Weighed eah a-pleD Cnderie D @eed and o?erie and reorded the -aD did
Bet ie?ing and reening @or eah a-ple Cing the ie?e ha?ing apertCre ie73 D 106 and 130 -iron .y @irtly Bahing o@@ the @ine o@ E73 -iron and@olloBed 106 in to a pan and 130 into a pan D Be only Bahed o@@ the E73 @ine
ine Be an alClated it @ro- the tarting -a o@ the a-pleD a@ter Bet ie?ing Bedried the a-ple again in to the o?en @or 1 hoCr $@ter an hoCr Be took the- @ro-the o?en and prepared the- @or dry ie?ing and reening .y plaing eah into itie apertCre ie?e and pCt on to the -ehanial haker @or 10 -inCte @or @Crther ditri.Ction and reorded the -a eah ie?e pan ontained aording to itapertCre ie @or the three a-ple .y Beighing on to the -a .alane and did thepartile ie analyi alClation
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/ APPARATUS AND "ATERIA%S 'et o@ ie?e ha?ing apertCre ie 73 D 106 and 130 -iron
9a-ple #errik @eedD Cnderie and o?erie*
-etal pan
!letroni Beighting -ahine #-a .alane*
Mehanial haker
rCh
Ct -ak
'a-ple plitter
Water @or Bet ie?ing
?en and o?en glo?e
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62 !RRI) 'R!!N ;!R'IO!
'reen apertCre ie
#-iron*
Ma #g* Perentage #*
130 774 91A8106 669 2740
73 294 A67
E73 74A 90A3
(($L M$'' 242g (($L100
69 !RRI) 'R!!N &N!R'IO!
'reen apertCre ie
#-iron*
Ma #g* Perentage #*
130 4A 190106 260 683
73 486 1281
E73 2AA8 7A04
(($L M$'' 97A9 (($L100
64 !RRI) 'R!!N
$pertCre ie
#C-*
Ma #g*
#9439g*
Ma #* C-Clati?e
Cnderie #*
C-Clati?e
o?erie #*
130 102 2A3 A703 2A3
106 269 762 8A49 1037
73 9A4 1141 7802 21A8
E73 26A4 7802 0 100
(($L 9439g 100
63 !RRI) 'R!!N &N!R'IO!
$pertCre
ie#C-*
&N!R'IO!
Ma #g*
#97A9g*
Ma #* C-Clati?e
&nderie#*
C-Clati?e
?erie#*
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130 4A 190 A87 190
106 26 683 A183 813
73 486 1281 7A04 20A6
E73 2AA8 7A04 0 100
(($L97A9g 100
66 !RRI) 'R!!N ;!R'IO!
$pertCre
ie#C-*
&N!R'IO!
Ma #g*
#242g*
Ma #* C-Clati?e
&nderie#*
C-Clati?e
?erie#*
130 774 91A9 6807 91A9
106 669 2740 4067 3A99
73 294 A67 91 6A
E73 74A 90A3 0 100
(($L242g 100
GRAP#S
.1 DE55C C5EE+ )EED
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C232lat)*e 7 2n.e-s)4e 8 o*e-s)4e *s a,a-t2-e s)4e
O!ERI6E
UNDERI6E
a,a-t2-e s)4e 5236
(232lat)*e 7
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9 DISCUSSION OF RESU%TS
9.1 INTERPRETATION OF T#E RESU%TSn oCr reClt D the graph @ig 79 illCtrate the relationhip .etBeen the o?erie -a
o@ errik reen and the apertCre ie o@ the ie?e in the la.D it Ba @oCnd that the
greater -a on the ie?e i Bith the .igger apertCre ie and till -ore @ine Bere alotrapped Bhen Bet reening it Ba alClated ine it Ba Bahed o@@ Bith BaterD -ore
than the -a trapped on the 106 and 73 -ironD .Ct aording to theory the hape
o@ the graph i the Cpped hape thi -ake oCr reClt to .e orret orreponding
Bith the Cr?e
etD thi i the -a that i @ed on the reen
and it depend on the opera.ility o@ the eondary .all -illD orret -a i to .e @ed on
the reen o a to o.tain the orret and aCrate reClt ine the reen i only Ced
to lai@y the ie o@ the partile aordingly $ the apertCre ie inreae the -adereae thi i .eaCe the reen i @ed Bith the grinded -aterial and it i oCr deire
that the reClt are thi BayD dCring the pratial ie?e analyi the ie?e Bith -all
apertCre ie -anaged to trap -ore @ine and it inreaed a the -a dereaedD
-ore @ine Bere Bahed o@@ #E73 -iron* ied partile there@ore the relationhip i
in?erely proportional
eti?e i to end the orret
-aterial to the eondary roCgher ell @loat depending on the grinda.ilityo@ the
eondary .all -illD i@ Be ha?ing -ore Cnderie partile Bhih are E106 -iron on the
reen than o?erie #106* -iron then the o.>eti?e i -et o that the o?erie i
end to the eondary -ill @or re grind
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: CONC%USION AND RECO""ENDATIONS(he .igger the apertCre ie there -ore partile Bill pa throCgh and the oppoite ialo trCe @or -aller apertCre ie a -any partile Bere trapped in the 130 -ironie ee-ed to .e the ideal apertCre ie @or the o?erie a-pleD the errik reenhoBed the orret reClt aording to the hape o@ the Cr?e o.tained there@ore the
reen i operating Bell and it lai@ied the orret ie o@ the a-ple pro?en .ypartile ie analyi Cing et o@ ie?e in the )1 la.
More ie?e Bith a -all di@@erene in apertCre ie hoCld .e i-ple-ented in thepro>et @or reClt to .e -ore aCrate ine the partile Bill .e ditri.Cted on -anyie?eD .eaCe o-e partile are -aller @or a .igger apertCre ie and to @ind oCtthat a-e partile are trapped on the a-e ie D the -ore the ie?e there -orepartile Bill .e eparated aCrately aording to their repeti?e dia-eter
(heoretially the graph o@ C-Clati?e Cnderie and o?erie ? apertCre ie hoCldinteret at 30 o@ the graph and thi Ba trCe Bith the reClt draBn on -y graph thi
i Bhere -ot partile Bere trapped
1; %ITERATURE CITED 5REFERRENCES6
10.1Donald Mcglinchey, “Characterization of Bulk Solids”, p!1, C"C #ress, 00$ %1&
10.M.S., Ma'louk, and (.#, )anie*ski, Materials for Ci+il and Construction ngineers,
-ddison/esley, Menlo #ark C-, 1 #-2 1134 %&
10.!#erry, ".5., and D., 2reen, #erry6s Che'ical ngineering 5and7ook, 8th dition, Mc2ra*5ill#-2 9!!4 %!&
10.9:., -llen, and -.-., ;han, Critical +aluation of #o*der Sa'pling #rocedures, :heChe'ical ngineers, May 130 #-2 perations of Che'ical ngineering 7y McCa7e, S'ith, and 5arriott.
10.8 Direct Measure'ents of the Surface nergy of ?uartz and >rthoclase , /@ Brace
and (B /alsh , :he -'erican Mineralogist, Aol.93, Septe'7er>cto7er, 18
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Per@or-ane appraial #ale 1E10* o--ent: !-ployer/'tCdent%Cality o@ Bork
%Cantity o@ Bork
Reponi.ility/Relia.ility
(heoretial knoBledge
Pratial kill aGCired
Moti?ation
o--Cniation kill
+C-an relation H Bork ethi
Initiati?e / Pro.le-Eol?ing
Report Briting
Wa the tCdent a.ent @ro- Bork dCring thi period =!' NI@ =eD nC-.er o@ day and date a.ent:
I@ =eD tate reaon gi?en:
I@ =eD Ba a dotorF erti@iate C.-itted #i@/Bhen reGCired* =!' N
o--ent: (&(
Signatures
'tCdent ate:
!-ployer: ate:
'Crna-e