TIXE JIISPOSAL O F NITRE CAKE. TJJS Spcciiil Joint Cominittcc of tlie Chcniicnl Society niid the Socicl y of Clicmicnl 1 ndiistry, :ippointccl to consider tlic question of tlic ntilisnlion of iiitre cnkc (this Joiirnnl, 1015, S57), lins i~eccivctl n. iinnilicr of soggcstions ns to possible iiietliods of clisposiil. hnong tlio siiggcst ions mnile iit the Clommittcc ilsdf were the following :lrwting tlic iiitrc cake mitli comnion snlt, *:ollec:t ing t lie hydrochloric ncid, nntl nftcnvnrds 1 rcnting the sodium sulphntc in the Iilnrk nsli Iiirnacc iii tlic IIS~I:LI wny. 'I'hc dcrnnncl for h clrodiloric ncitl is liniitecl nnd siiltcnkc is very cKeap. JIenting with ningncsitc to innke Epson~ snlts, for wlricli tlicrc is n grcnt ilcninntl in the tcstilc iiitliistrics. Using i t t o replace srilpliuric ncitl in tlic Innnil-Piicbirc 01 supcrpliosphntes. Ronst ing i t wit 11 iron scnlc to get off 1 lie avnilnblc ;wid in its iiiost eonccntrnt.cd form. This requires a high tenipci.ntrii*c, nntl the action on the vcsscls cinployetl is ronsidernl>lc?. Using i t in the mnking nnd glnzing of sing bricks. Using i t for sprinkling on Innniirc lienps 10 f l s t h e nmnioriin. Ileatirig i t witli miscd sulpl~iclc ores to cstriict 111c zinc. TJie follon4ng suggestions hnvc 1)eeii received in rcsponsc t o the rcqiicst of tlio Committee :d. Ci. Uyrcrcf, c/o Burt), Boiilton, mid IInywood, !;,I. Cmnoii Street,, E.C. Blowing stcnrn or air iiitu tlic mclL iind directing tlic niisturc of acid vnpou1-s iiito tile siilpliuric ncid plrmt. Grnnulnting tlic iiiclt by pouring into water and cciitrifiiging the giriins to o l h i n ib clcnn godiiini srrlphnk, iuid an acid mixture, wliicli can be s irLyctl into a11 niisiliiiry clininl~cr of nciil plnnt., t Ec c1i:inibcr ncicl olJtnincc1 Iwing concent rated mid iisctl ngnin i n tlio nitric ncitl proccss wlicrc : L little sotliiini hisul liritr? ir irnini ortniit. A. Cutldic?;. :ID, J ~I & T Roncl, Liiit!orpe, Wtlcllcs-l~rongl1. Using tile nitrc cake to increase cstrnc-1 ion of coppcr n k m roasting coppcr pyrilcs, 41y clini-g-ing into t.lic lower floors ol n ~iiultiplc 11cai'LIi furniicc. .Utilisirig iiit,i-c citkc n s n sourcc 0 1 acid for lisiriation of coppcr nintcrinls, pyrites cinders, ctc. 'Utilisntion in tlic trcnclics in place of acid to clecompoSC soap suds nnd to iibcrnic free fid t y ac:iils instcad of clisclinrging into rivim. Using nftcr ~i c i ~t ~~n l i s i n g 1 o prccipilntc Imriiiin 1IytlrosuIpliitlu to mnkc b l u c fi;rc mil sodiuiii I i yt~roaiilphitla.
S. Ifourc CoIZIm, 0, Cnvcndisli Z'lnce, New-~c~nstle-on-Tync. Nising one piirt, of lcntlicr cli )pings \villi two pw1.s of nitro cnkc nnfl licnting lo