DERRICK SCREEN PROJECT.docx

8/9/2019 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

mailto:[email protected]:[email protected]


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Table of ContentsMonthly Report: Work Integrated Learning..............................................................1

1.1DEFINITION PURPOE OF IE!IN" #ND $REENIN"..............................................%

12 $)R&N9

121!(I;!'9

19PI(&R!' < !%&IPM!N(' &'!9

&.T'EOR(................................................................................................................... )

21'I!;! $N$L='I'4

91!


3/15

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


4/15

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


8/15

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


10/15

/ +/ 1// 1+/ &//

/

+/

1//

1+/

(232lat)*e 2n.e-s)4e an. o*e-s)4e *s a,a-t2-e s)4e 5236

2nder3i4e

o5er3i4e

a,a-t2-e s)4e 5236

(232lat)*e 7

.! DE55C C5EE+ 7+DE5E

/ +/ 1// 1+/ &//

/

+/

1//

1+/

C232lat)*e 7 2n.e-s)4e an. o*e-s)4e *s a,a-t2-e s)4e 5236

2nder3i4e

o5er3i4e

a,a-t2-e s)4e 5236

(232lat)*e 7

.# DE55C C5EE+ 9:E5E


11/15

/ +/ 1// 1+/ &//

/

&/

)/

*/

./

1//

1&/

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

.#

/ &/ )/ */ / 1//1&/1)/1*/

/

+/

1//

o*e-s)4e 3ass *s a,a-t-e s)4e

a,a-t-e s)4e 536

o*e-s)4e 3ass


12/15

.'

/ &/ )/ */ / 1// 1&/ 1)/ 1*/

/

1//

&//

%//

fee 3ass *s a,a-t-e s)4e

A,a-t-e s)4e

fee 3ass

.6

/ +/ 1// 1+/ &//

/

&//

)//

ne-s)4e 3ass *s a,a-t-e s)4e

A,a-t-e s)4e 536

ne-s)4e 3ass


13/15

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


14/15

: 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


15/15

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

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DERRICK SCREEN PROJECT.docx