Document KRvgJO3paD0Nybgd1J0mnGn3o

FILE NAME: WR Grace (WRG) DATE: November^ 1960 DOC#: WRG271 DOCUMENT DESCRIPTION: 1960 Letter to Max Corse, Western Mineral Products regarding problems with stoners. California Zonolite Co. PROCESSORS AND DISTRIBUTORS OF VERMICULITE 3.4.40 S A N F E R N A N D O RO AO W E S T LO S A N G E LE S 39 OAL.FO RN.ia .ELEPHO NE CHAPMAN 3-3.3? ALANTS ANO O FFICE S LOS ANGELES SAN FRANCISCO SACRAMENTO o n n g 4, i960 Mr. l a F. C m M a t i n Mineral Produces Co 1720 Madison SC 1. I Minneapolis 13 HlnasaoCa Z an writing this to you oiaco Z know y w k m ce loose ooo plose with o oeoaor thoe Is processing Libby ora. Ho hcra on operating problen oo our stoners which wo installed la u r l y August, os follows Oa eho oao furaaeo uaie which runs prlaarlly Oo. 3 V oil of our Bo. 4 production sad oil of our Bo. 1, wo flad thee eho perforated dock aotorlol (stainless secol) hllads wary badly, especially after extended runs of Bo. 4 ora. The "blinding" la alaooe 1001 la the upper area soar the rock discharge point and at loose 601 oa eho balance of the dock. Although w bora boon Inspecting thosa docks cock shlfe and brushing then with o wire brush, the blinding atlll Is aerare. Hhan wo took the dock franc out lost Saturday, w found this high dagroo of blinding and also that le consce bo roaorad by breaking fren the upper side (notorial aldo), but bos to bo brushed oa eho air chest side. The blinding la caw ed by relatiraly long, thin particles of asbestos fibre which occurs In oil the alano of Libby ore. These particles apparently got upended and pose through the holes for enough to beccea flrnly lodged in piece. Brushing the outside surface only, breaks off the upper portion of the particle, leaving the hole severely plugged. Further brushing does not retira the partiales. He ora planning ta order o s p a n dock and frans unit so thoe wo can periodically rnova one which is "blinded" end replace it with one which has boon cleaned. Vieh the sow all nstel unit, this only takes a fan niantes to do whereas cleaning the dock d o t h fren the underneath side la quite a job. It nay even bo accessory to ronera the perforated natal doch fron the frano in order to clean It thoroughly due to the ribs supports, the cross franlag, sad the 3"*4" orar*lapping section In the center. However , before doing this, Z thought it beet to check with yen end others to see If there Is a slapler aaswer to this prahlen. Tory possibly, blinding to this degree done not occur with South Caroline ere es Z don't believe there era the sens "gangue" notarais associated Sbr. Xa* ? . C a n o -2- with the nralcallt. A la 11 c m m * lien a aatlcaabla aaonat of nry ia* rock - probably aagaatlta vhich etaally paoaoa ehreegh tha dock viehout hilad* lag lt# aad proviiiooa han baaa aada to Cray le and bload le off pcrlodlcally. Honrar, ehaaa placea of abestoa ara diffarome, aad na ebalr si*, Z vould uapeeC thay coa prlaarlly froa No. 4 era aad eo ion xtaaC froa No. 3. Z aay ehla baciwio tia lacead ale vlth 1dameleal ogmlpaoat rana 11 of oor No. 2 for aeoaaelc aad a llalead aanoaf of No. 3 o han orar raa No. 4 ea ehat Z l ^ d also aak lf yoa h a n pvoeaaaad aay amar of Votar lapallane aggrogata oa a furaaca agalppad vlth a itaaar as tharo la aa tadlaacloo ehat Cha dock caa be tkoroaghly aaatad aad blindad by tha aaphalt aaalaioa 1 aay astaaaln aaoaat of ehla pradact la aada. Da yoa fiad thle ta ba tba casa, aad kat da yaa da ta a n i d tha coadltlea ar rallan ltf Maald llka ta hear froa yaa ea tkla. aa It haa baceaa a dalaita aalataaaaea praklaa itk aa. Ha aake a gaad daal of aa. ft. ceacrete aggrogata la Oaaa barg baga (eloth) for ooa of m raaf dock appllcators. Prior ta laatalllag tha atona, n had oanral flraa la tha piaat daa ta ehaaa baga charrlag aad baralag. Ha laatallad tha etaaara vlth cha idea ef tadaalag tha prodaet cao* porotera aafflelaatly ta a n l d thla potaatlal flra daagar. Uhaa tha dock la aav or aovly clonad, tha caallag la adegoate, bot aa lt hilada ap, tha feapara* tara hacaaaa aacaaaln aad a h a n oacaaloaal flraa. 4a a raaalt, Z auraly aaad a gaad aovar ta tha praklaa. Oddly eaoagh, cha t p i n t u r a oaldca la hlgh aaoagh ta ckar tha aaao pradact la a papar hag. Lee aa kaoo kat yovr aaparlaaci haa baea. car A. I. Hlae Ployd Itavart 1. 4. flalch J. laalay