Oet. 0, 1D31i CIIEblISTRY AXD INDUSTRY 588

MAXWELL CONTINUOUS MIXING AND EXCAVATING PROCESS FOR

SUPERPHOSPHATE (PATENTED IN GREAT BRITAIN AND FOREIGN

COUNTRIES)

By L. A. MITCHELL, M.1.Chem.E.

Todiiy it, is gctiernlly ndiiiittcd that i t continuous working process shows grcntcst ccotiotiiics. In t h siipcrl)liosl)li:itc itiditstry of rccctit ycnrs tlic iiit~rodrtct.ioii of tlic contiaiious \\.orking process hcis h c i i t.hc liitcst trcrid of tlevcloptiicnt. 'Ylic ticw ihs \vc l l Continiious Alisiiig niitl Esciiviititig Process for sitpcrplio~pltntc tnnllufacturc sho\vs rcninrkahlc rcsiilts in 111:i1luf~cturitig costs niitl t,lic pliitit is of cstrctiiely siiiiplc iitttl utiiqiic

sliapc of nn orditinry large iiiotor tyrc, and is built up of xiinclliiic cast-iron sections bolted together. The opening 011 the iiisidc is bonrdcd up with the csccptiou of tlic inlct from tlic miscr, tltc siictioii for the vciitilating fati, and tlic cliutc for tlic filial superpliosphatc powder mlicii cut out. Tlic dcn rcvolvcs very slowly, viz., oiie revolution in four hours, ntitl the iiiisturc is ruiiiiiiig in cotitinuously a t thc bottom of tlie dcii or tyrc from tho mixer, titid ns tlic dcii goes rouiitl, thc iiiatcrinl is setting, tltits, by rcii~011 of tlic cross-scctioiial shnpc of tlic dc11, i t docs not fa11 out. At tlic top of thc dcii is fiscd a revolving plntc on tlic iiisidc arranged with cutting knivcs for sliiivittg off tlic dry supcrphosphatc in it fine powdcry condition.

Thc iiiiitcrinl as cut orit frills do\vti a cliiitc 011 to B tray conveyor wliich dclivcrs to tlic storngc hcaps. The illitstri~tion slio~vs i i gcticriil nrraiigcment of the dcii.

dcsign. Tlic syiiclironizcd fccditig of tltc wid ntitl ground pliospliiitc rock ctisitrcs csnct proport.iotis ; tlic mising nntl dclivcry to t Itc drti mid find ciit,tiiig out after scttitig is quite iiittotiiiitic iitid continuous, iitiil rcquircs 110 linnd labour. 'l'lic outfit ciiti 1)c itistiillcd for 6 , 70, or 20 totis per hoiir, niid oiic iiiiiti ciiti supcrvisc the oprntioti of 11 ititniI)er of units, thus Inbour costs nrc rcduced to i,lir iil,solutcly tiiiiiimum. 13y retisoti of tlic siniplc clcf;igtt rititl niitiimitm i~tttoirnt of tiicchnniciil pnrts, blic iil)lice1) costR niid power cotisi~tnptioii iirc

Tho plntit coiisists of a rotntitig Inccliiitticiil fccdcr for thc ground pliospliiitc rock iind nlso n rotiitittg wl~ccl for dclivcry of tlic ncid in csnct proportions, tlic driving of tlicsc two fccilcrs bcitig from otic driving eltnft so tlirit tlicrc cnti bc iio vnriittioti. Tlic noid ntitl groiiiid phos- phiit,c rock nrc dcli\.crcd into (1 coiitiiiitoiis trough iiiiscr with spcciiillp nrriitigcd agitating blritlrs to givc a very tliororigli misiiig. Tlic misturc is dcli\wcil to a COII- titiiioua rotnt.hg don. Tlic dcn resoiiiblcs csnct.ly tlic

csLret11ely low.

. INDUSTRIAL NOTES FROM ABROAD

TURKEY Tlic C'olporiitioii of 1StitiiiI)iil Iiiis ncceptcd t,hc stiggcs-

tioii of ;I J3ritish Artii for :I Irirgc oil-refiticry to bc built 011 tlic ljosplioriis. Tlic firtii iii qucstioii, which is oue of tlic 1iiiiiicroiis siibsit1i;trics of tlic tiiiglo-Iriiiiinii Oil C'~tiil)ii~iy, wislics to itiiport hcitvy oils for rcfiiiittg, ;itid a slirirc of tlic profit,s frotii tlic rcfiitcry will go to tJic Jlutiicild C'or1)ortition. The plniit will also rcvcrt to blic I:tt,tcr i i t t,lic ctid of fiftecii ycnrs.

SYRIA A report from Jhirut stiitcs that thc niithoritics of

tlic 12cpiiblic of I,i\xiiioii, which is iiudcr Prciicli protcc- toriito, :ire cotisitlcritig thc propos:tl pit forwirtl by tlic cngiticcr Albcrtj Nikiish for 1111 csplosivcs fiictory t.licrc. S\ipplics of thc rtiw iii:~tcrinls requirctl for tIyti:ittiitc iitttl csplosi\w iirc siiitl to bc plciitifiil it1 L i h i i I toti.

BELGIUM At the gciicr:iI tiicctitig of tlic " Cotiipignic Chiniiqiic

ct Iiitliistricllc clc .Bclgiqiic " tltc directors Iiiiitctl tliiit t,licy lilivc i n vicw tlic cvciituiil fusioti of this cotiipiiiiy with tltc '' Uiiioti Cliitiiiquc 13clgc." Tlic two C O I I C C ~ I ~ S IIILVC iilrciitly closc fiiiriiiciiil tics. !Plic first ~ttctttio~icil

J3iiiriry coiiil~oiiiitl fertilizers, rititl ticw iiititcririls for tlic p i n t iititl Iiicqiiw iiitlustry sitcli ;is spcciiil oils, bliick

of coiil tlcpiirttiictit. Thc clictiiiciil products de~~iirttiiciit hiis bccii ClYccting its progriiiiiiiie of spcciiiliziitioti. Tlic Sriiitt-Gltisliiiti fireproof itiiitcriiils fiictory litis cstciitlcd t,hc tiiiitiiifiictitrc of iicitl-resisting iiiiitcriiil for cliciiiiciil iippiiri~tus. 011 tlic iiictlicitiiil sidc, bot.11 proditction rind trricle show grciit ntlviiiiccs. New ttiiiliiriii l)rc\vx- t,ivcs, 81s \vcll 81s ticw prcpiir~itk~~is for riitliology, opotlic-

11 11CW

orgiitiic product; for iisc iii cii11ccr rcsciirch is iilso itviiiliiblc. Il'lic vriricty rind qiiiititity of tltc cotiipritiy's pltotogriipliic 1)roduct.s liiis iticrciised, liccpiiig piicc with tecliiiiciil iid\~i~ticcs. 13rotiior, iuicl pliitcs I'or iicriiil photogriiply, iire iiow iticlutlctl, i i i it l tlic " Botobcl " fiictorics iirc t i t t,Iie tiroilleiit, csl)criiiiciit,iiig in the iiiuiiufircturc of films.

I1:rs rccciitly put scvcri11 IIC\V protlucts 011 the 111arkct.

lilcqllcr, ctc. IICC IlO\V turt1cd out by t l l C by-prorlucts

ritpy, tllltl cllrlot:rillology, werc lllilnllf:Ictlircl1.