β Scribed by Dreaper, W. P.
No coin nor oath required. For personal study only.
on moist finos, nnd tho totnl cost for roasting low-grndo mntcrinl docs not oxcccd 80 conts pcr ton. I n plncos whcro nctunl sniclting is cloiio by rovcrbcrntory, it mny bc possiblc to UYO tho wwtc hcnt of thc lettcr for cnrrying out a slllphntising ronst, as a smclting rcvcrborntory rcqiiircs nn intcnsc hcnt throughout it8 cntirc loiigth to liqucfy tho chnrgc, nnd tho firo gnscs on laving it cnrry niorc thnn tho dcgrcc of hcnt required for effecting cnlcinntion.
A chcnp solvent is tho ninin considerntion ; it is possiblc for n enicltcr to HU ply its own want of ncid by crccting a byc-pss fluc lcncfing t o nbsorption towers filled withconrsc cokcdown which wntcr is trickling. Thc ncid SO obtninccl is very dilute, but strong ncid 1s irntlcsirnblc in lenching. AH nnothcr source of ncid I rodcl suggest the fumc from thc stnck cnd of the fhc, which nlwnys contains morc or letis sidphuric nnhydridc. Thus in one cnso I found niorc thnn 15 p r ccnt. SO,, nntl of this mntcrinl thcrc wcro ninny tons nvnilnhle. On mixing with wntcr nnd decnnting, n strong ncitl is obtnhicd which mag bc used t o strcngthcn the liquor from the tower. 'I'hc r o a s t d slimc woulcl require but little ncitl ns n consitlcrnblc pnrt of thc c o p p r is ~oliiblc in wntcr. Thus in Expcr. 21, 70 p r ccnt. of tho rccowrnble coppcr wns prcwnt ns sulphnte. Thc ronrrtcd mntcrinl is clroppcd quite hot into a weak liquor, mixing its tcmpcrnturc niicl n s h t h g sohtion.
Thc chief soiircc of cxpcnse is the iron rcquircd for ceriicntotion ; this niny In, considrrnbly rcduccd by using I)rokcn-up low-grn(lo mntto to prccipitntc tho coppr. If nccmwwy the precipitation is coniplctcd with scrnp iron in 11 wpnrntc Inimdcr.
In thu mnjority of cnws thc inipurc prccipitntc ~O C S bnck t o thc blast-furnncc to be converted into mntte.
It is of coursc inipossihlc t o mnkc n gencrnl atntcmcnt n s to costs, n s uxpntlituru vnries grcntly uccorcling t o thc country or even district. A t Nntronn (I'n.) thc totnl cost is 81.87 pcr ton of orc; n t mother plant in tho Western U.S. it nmouiits t o $2.96.. Thcsc t w o plnnts urn the Longri~nicl-Henclcrson process on pyritic cintlers. This is clonc nt tho snmc tcnlpcrnturc ns tho sulphntising ronst nntl in n rcvcrlm?mtory or niufllc furnnce. No ncitl is ncctlcd, h t tho nmount of snlt rcquired is i J t o 20 pcr ccnt. of tht. weight of orc trcntcd.
An npproximntion of thc cost may Iw nrrivcd n t 11s conipiling stntcnients of cost of thc rurious opcrntions nnd of tho inithl cost of tho plnnt diridcd by t h u number of tons trcnted in oiic ycnr:-3. Lenching.
π SIMILAR VOLUMES
Wlien I wiis liouourcd by tlic invitation to rcad, a papcr on suponificiition before this Society, I spent soinc tiiiic trying to fiud n title that \vould cover the whole of the ficld I wislied to discuss. I found this to he iuipossiblc, so I niust ask you to bcar witli me if I first dc:d briefly wi
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## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a βFull Textβ option. The original article is trackable v