The problem considered in this work, is the determination of a suitable scheme for cyaniding a low grade Cripple Creek ore. For several years many attempts have been made to solve the metalurgical sic problem presented by such ores --page 1

Forrester, David Lawton

Porth, Harry W. L.

English

Missouri University of Science and Technology (Missouri S&T): Scholars' Mine

Scholars' Mine Bachelors Theses Student Theses and Dissertations 1911 Sulpho - telluride ore David Lawton Forrester Harry W. L. Porth Follow this and additional works at: https://scholarsmine.mst.edu/bachelors_theses  Part of the Mining Engineering Commons Department: Mining and Nuclear Engineering Recommended Citation Forrester, David Lawton and Porth, Harry W. L., "Sulpho - telluride ore" (1911). Bachelors Theses. 21. https://scholarsmine.mst.edu/bachelors_theses/21 This Thesis - Open Access is brought to you for free and open access by Scholars' Mine. It has been accepted for inclusion in Bachelors Theses by an authorized administrator of Scholars' Mine. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact scholarsmine@mst.edu. StJLPHO - TFn.URIDl!~ ORE.byD. L. ForresterH. W. L. PorthATHE SISsubmitted to the faculty of~£~a'SCHOOL or JIlNES AND l.fJ:fALLURGY OF THE UNIVERSITY OF MISSOURIin pa.rtla1 :f'ulf111ment ot the work required tor theDEGREE OJBACHELOR OF SCIBOE IN )lID DGIJTEJJlI:NeJ-ROlla! ][0.19 1. I j<UApproved by -ill,- .G,t#lMo-~ -_Pro:ressor at Keta.llurgy •.11.86'/Introduction ... -- - - -1Preblem - - -- - - - - ~ .. - M 1Golden Cyole Mill -Portland Mill - - - - - - - - - 2••tlMHls G't Attacking R"'D\QL.-'~, - - - - 4-Deacript.ion C)f Ore - - - - - - - - ....... 4- - - - - - - ~ - 5Ae1cl1ty 'rests ..... - .... - - - - .. - - ..... ..., 5L...h1ng and Percolation Tests -~- -- 6Pine Ir1nding and Agitation Tests - .. - 7O.bCentrat1en Taste - - - - .. - .. ~ - • e....ting "'ests .. - - - - - - - ... - .. ... .....9G...ral~luel.ns - - - ~ - ~ - - - - 11suoh ores.-XHE CYAlflDATIOlf OF .It.. SULPHO-TELLURIDE QRE.-The problEWD. oonsidered in this work, ie th. deter-mina.tion of 8 suitable scheme tor oYMiding a low grB.deCripple Creek ore. Jor several years many attempts haTebeen made to solve the meta1ur~ic~ problem ~reaented by.~. \~::~,. "'::~" f:.· ~ '-...Shipping to Color-Woo Oity costs· *1:"00 per ton and~','> ,~. : ~.,~ ~:~ ¥"'t~: : :.~;roasting oosts $0.76 per ton. T1:1,e ,:t:r.ea.tliiEini·~rtiiibw'd ....en..the high grade ores which 18 chlo;1riai:i;.(~ ~li:t~~h~,. wi .a .....~.... \0-follawred b:r or by cya.n1dat1011 alo11.. 8eoh of which »roo•••••is preo~ded ~ oQmmero1&l c0n81deratloa.The proce.e ~ollow.d at the Ind.ependenoe 11111 atY1ctor. 0010 •• 18 that of tine grinding foU01Ifed b7",-anidation.At the Gold.n 0701. Kill at Oolorado Oity, .. rout11 liTem the ore :pr...1oua to cy'an1datlon. .A flaw eheet1s abon. herewith.now sheet GOlden 0101e Mill.ore-un1oaded trca a. R. cars.}crushed and SGlp1f14~8tor...e bilul¥B&l.l nUsf'Routing J'urnMes - Edwards Duplex.~-1-Str~nTa.iling AmaJ.g.~,~Material colleoted.~, . .. :Y --------.~ - 0- :<.:~':tpr Amalgamating~," ... , . -V~ ~ ~ ," ~ 8e.ttler'~Ss.nd,VLeaohing- ~-t~_!r'_-Vetc.Chili Hills - 20 mesh soreen~B1ankets and RifflesOlassif1a.rs-Dorr}Overflow~Agita.tionTanksit:Butter •• t11.ter4'etc.Retort.....vBullion-¥Crucible'YJLelt-¥Gold bar:v-llerou17!he Pori1&nd till ot Color&do OitY' ciTes a. roastto the ore followed by oh~or1nat1on in barrels andcyanldat10n ot tailing from ohlorinatio:n.A flOW' .heet tollows:-2-Flow sheet Portland Mill.Ore R. R. oars..vBins-J;Crushed and smapledi' 0_Roast __,_ .. . .... ("CaOq~~.4.G'!#':¥ ~ -----'-'l11 SO. - 300#Chlorination barrels 2 4::ySanda.J'laMbed'With KeN::vTailing:vTttJ-ling¥ClassifiersrSlimes¥agita.tedwith KeN-Jt'Vacumnl'ilt.rsI..,y---KOlTsol]_~>_---r-~(_-..;..asIOl.-7 J:::vSolutionFilter Press~Au.2 S.3¥lLelted+Refined-.vSolution~S~. cV~ Tankst'Au. Preoipatedwith Zn fume--VAu. ppt'IVRefined~vSol.K~ solutions of the problem presented by theselow grade ores of Cripple Creek have been suggestedand the fa.ilures are equal. in number to the suggs$tiona.The reason for failure seems due to the differenoe be-tween the aotion of KCy., dn gold and on the tellurideof gold.In our experiments We a.ttempted to determinethe extract1in attainable by the following methods ofoyanide treatment.(1) straight 1each1ng on·rsw ore ot differentdegrees of finess; (2) Fine grinding in tttbe millfollowed by a.g1tat1on; (3) conoentration withcyanidat10n or tailing and of conoentrates; (~) RO&8t-inc the ore fo1.1owed by (a.) straight leaoh.1na; (b) :finegrinding and agitation; (0) Cl.slu,ifioat1on of mater1a.lwith leach1ns ot sande and agitation ot .limes.!R1l: ORB.The ore upon which these experiment. have beenmade if! 8. typical low grade ore of the cripple Oreekdistriot. It 1- a lot of 50 pounds received from theRexall Kine ot Victor. Colo.the valu.. are contained in the telluride of goldassooiated with pyrite and fluorite 1n a phonolite gan~e.-4-The analysis o~ the Ore is:8102 - 57.00A1203 -17.80CaO 2.82MgO .40:reO .3.543.59$7.00NB.20dl'1.2.00xo)2sAu.Ao1d1ty- ("1) Solution aoidity - 20 grus ore made to pusa 100 mesh 80reen were &q1tated with ~o 00 water 15. Ih~minutes and filtered_I1F11trs.te was titra.ted with(li}liaOIi solution g1Ting 8. trace o-r soluble aoidity (2) Latent.,.Wa.c1dity- 10ce (If) llaOH were e.dd.d to '1 res1d.u.e trom (1)~and agitated tor 15 ~te8 and tiltred. J11trate W8aN,~","/treated y1thtllH2SOlf. solution giving latent aoidity 10.8lbs Ca.Q per ton. (3) total &c1d1ty- 20 gIns ot ore ma.deto pase & 100 mesh .oreen were agitated with 10 00(.)NaOl solution and 25 00 water tor 15 minutes and f11tered.trw:filtra.te wa.a titra.ted W'1th(li) :H2SO4 solution giT!ng totalacidity 22 lbs of 0&0 per ton. Th1s1noreue of total-.5-acidity may ha.ve bnsn due to some e..ct1on of N'aOH onsolub1e salts assooiated with the gangue.Leaching and Peroo~at1on:-The objeot of this series of exper~ents is tofind the extraot1onattataabl.e by eimple l.e&ching orperoolation. Three samples ot .3 A. T. eaoh thru 20, 40and 60 mesh respectively were put into 3 beakers andlaO 00 of KeN solution oon....ining ~o lb. KON per ton were&deled, arter sta.ndin& 4S hours the substanoes were filteredand waehed. !he XJJ]i' was determined in the filtrate tmdthe residue ....ayed tor /4D.. The reeults of th.18 ••r1••ot exper1m.ente are giVNl 1n the follow1n8 table.Table :10. I.Screen meshnnr oo~tiODP* per tonAssq betoreAsSq" after209.19.69.6'to9.6,.5.605.606.806.S0'No l~ added.The XCN ,aolutlal1 U!1der the conditione used, has aocord-1nI to these t ••t.. no &Ot1on Whatever on the gold o'tth18 ore.-6-"''0The next experiment was determine; whether finegrinding would make the gold amenable to 1:C1T solution.z.A sample of elba was put thru 100 mesh screen previousto dry grinding in a tube mill. Three e_1(p1fJ of 1hour, 10 hours J and 24 hours duration in the tube millwere made, a sampJ..e being t&ken after ea.oh oampa,ign.A screen &n~sis and an extraotion test weremade on these sam.pIe with the resn~lt. ahown in Table Jro.2Tab1e No.2.it••+..•..•..•4-II•• ," I.I ',' I I I•........,J......11:...... ... .&. ;, .Ai 16 ;;LJl.... ..I' e.l' §!t; J,Qi ~ iZ .. 16.2 .; 9. ! ZII......OJ). 2QQ ,;...ZiDI gpo;Scree.... ".....ZIlloill9.....t -g.l-...-""'--_3...2....·~ :...........2i......,:........* .......:......2 -...2_-=-:..1......9&............."....;....9..."_.....,; .......ZlooM8.....1_...i ~22__....LAlli i 3 Ii 1 : 5-:-.,.lL;iIoooo.1d:.....--............i_....i....._A....; .....,j2...··._...a;~I..'·._......;-.l·. 1..i__On the extr&ot1on t ••ts the re-.4t. ot wh10ll en.ehmm in !,labl. JroJ J A! ot PUl» 'Were ..,,1ta.... .-1tll12 A T of 0.51 ECll solutioa tor 2.\t. hours. fhe hiP.'So.~~l ...gold content 1n thi. ....,k 18 due to the apotty nat.-reof ore.-1-Table No.3.Wt ot : Pulp : pulp &fter: extraction: IteN: 1>sample · ozton; tr'lrtmel)t: OIS 14 0 1'& : £!mi:eprat,Pulp •·....··.. ••. ... .1hr :\$12 smg.: 0,46·10 hr, :165·..2\ hr.. :7~1.. O. 50 ...... •-.. .. ..• 9.48 ·,..·•.. .. •Q,2lf. .. O.g? :Z.5 ~,+ ,·0,25 · Q,22 :l.~ ~Q·• •..·9. 26 · 0.2 :2,2 2L.This shows that :ti.ne grinding furthers theextraction obtained. the results, however. do not showa. oommeraiaJ. practlcab1;t1ty for suoh a scheme since theta.1~i.ug still oontains 5010 ot the original value.Concentration with cyan1dat1on of Ooncentrates andof tailing.- In this test & s..ple ot 880 gr~8 of orewas crushed to pas. a. 110 mesh screen. This prod\1ot waeconoentrate4 by pann1DC with an ~rd1n~ gold pan.The ooncentrat.. &nd t&111na from thie ooncentration werecyanided separate1;r u81ng .. 10 lb ltOJ' eohltlo11 for ta111naAnd a. 40 10 xmr .01 for concentrate, nth the reaNlte givenin the tables 11- 8Jld .5.table :No.4.: wt. gD1S ••..Tailing .••ConoentrattUfwt of .Au. " Percent ot·• '1~'m • ,g'taJ, AR'.. ·It :;·....·'"• .. .~• Q·Q;L93J. ..t;•·..,004;18 ,t.§$•.···,°J.J.23!J. 61.~asea.,.0"1 to».2·20Q,lto••"»••·••·••..'I·••·Orl&1n&1oreKater1&1-R-The logs of gold equal to 16.6~ was due to theIloss of slimed sulphides in concentration. Th~ ratioof concentration is 16 into ~.lTa.ble No. 5.:Screen • wt of .. Au oz • extra.ct • • ~ • KeN• .. • •·. mesh .. swple· :toll • O:?i Iton ; §d£,traot • Con§.• .. It • •;... .. • • .. .... ... ..· " ·Tail ... .. .. •... ~·..ing T1y;'U 200 2 AT oa!tl liQI2 __: 15 " lJ.t.2·Thru .. ..... ..100 5 If 0,28 O,Q!t6 16'>+2 ; it.DOn ....lQP 2 ft .. 0,29 .. 0.02 16.6 .. 1+,6, .-,Thru .. ...·..Cone .. 2QO :J. tf 2,2 • .. Q,4o · J:§,J,B ... 2Q.. .. ..·..This process is not suitable on the ore givina on~~ low extraction of tke gold therein.The next ~er~ent was to determine the effect ofroasting the ore previoUs to oyanidation on the extractionoutainable. Roasting roakes the ore more permeable tossolution) a?ld a.lso free_ the go~d from oombination withsulphur and tellurium. A sBm.pJ..e of 908 grams ot ore) allof which was thru a 16 mesh acrea~was roasted in an assayDUffle. The oontent ,-ra.e l.owered. from 3 •.59f:J to 0.241, s.I •The temperature at the start was less 'than 600 0 c. andthen rasied to 1050°0 at the finish. The fr1ttingt~erature as determined by # Maok & Scib1rd on astmilar ore was 1090°0. The s&mple of the roasted orewas tested thus with a O.5~ KeN solution, according to-9-the following sohemes: (e.) .3 A.f. leached by 1000csolution in a beaJter for If.8 hours. {b)2 A.T. groundthru 200 lnesh and agitated with 6 A.T. of solution.( c) It A. T. 0 lass ified. sands lsached- slimes ag1ta.tedWith 3 times as much eo1ution.The results or the roast are liTen in the Table No.6.Ta.ble !fo. 6.•. Finali:femg "Oz Au per tonbItorl ; ...-rt,Jt ..:•••••,..,uT1mehqyrs•··,··t inohThioknessQi b,dRoasting of & Telluride ore.# 14 Be A 8 .P. Vol. 9;!he resu1t8 1n the extraotion are given in Ta.ble No.7.... ..r 1 •!#il)le ~. 7.KelT :Aruuqore :Aasq : ext. : 1ont.Cons,lb: oz ton: tails:oz ton:;gIl: :t in i'l< 91;t21l;;!r.at~m.nt:ore A.!. :: given :.... ,.Ie: O·2l4-0.54..: 0.2& : 0.28: 51.8Islimes were very smaJ.lin emt.-ta.ils combineda~5g to!: O.r!;-10-ea.se (a).The extraction obtained is onJ3 501- le&T1na 501ot the vaJ.ue in the ta111na. the small &d.dit1ona1reoovelT 1rl c.... (b) 40.. not WU":raast the add~d coat oteliminS t'lIId qUatton. In case (c) ~hc-:~~~iid:ie---oomparattna;r -.11. The reaaon tor ~cli::ii{~tr.t~:known,as the treatment ginn sands lfaS ~~~~:_:;~~~~.:~:;~::-. ~~ ~ ;. ,:~; .. : : ~: ~ :~~~ : ~ .... - .. "... " '"GENIBAL OONOLUSIONS:-In general .. Z'OUIt at... approxUtatel3' the 8smeextre.ction of so14 as tine srindinc. !he lOW' v&lue otthe ore would hard~ warrant either of 8Unb prooe'8esas the chaag.. tor m1lliba would exceed the T&~••reoover.d.. '11th a recovery of 5~ or t':'-;01n thtroaat oyanide schemes -the cr~e8 ot tJI..76 apportionedbetween I freliht to ~010rado BPrtne- .1.00 roasttns .0.76*m1nlni 12.00, seneraJ.. expense tl.OO, would 08U8e a defioitof *J..26. 1'1n8 gr1nd~ 18 a.e ex»ensl,.. as roaatl111 butwou.l4 decrease the defic1t as ore oou14 be oredited. witht3.85 tor a '5~ extr&Ct1on. It tallows that (1) s. cheaperscheme o't tr.atae.' 18 1l.oe~8a.r7 in Which (a' the rout1- e11mine.tecl (b )ac:re&ter extract101l 18 obta1ne4 (2) Themill mu.' be near the Ilt..ne to ea.",. transportation chug•••(3) the output of aiDe and mill m!.~st be large to 10werthe it.. rtf seaeral U»eMee.-11-JIID8. A JaBJJtAl,S- APR. 1908 P. 41IJI..

Sulpho - telluride ore

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Sulpho - telluride ore

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