Document M41ybBw31zE1RQKBz0mV5951a

fas Sh zr w ih -Wil u ams Co . 1 n t e r -Qf f ic e Le t t e r FOR Clcmlud mr . J Bin ANSWERifJS LITTER OF f r o m Chicago OFFICE 2X 5-W J156 OFF!^tsdliarlaa Besearoh o at s July ?, 1952 Su bj ec t Lithepssae - Semen UiCfAfFu mi OEFT Sosa* time ago two Gernaa atowiats* representing the Sanaa Load Pigmsat Manufacturers* aad the pigment and Paint Seeiaty of German Chemists* node a tour of tha United States aad called at the Storwia- William plant ter at Chiesgs* While tone they requested m interview with us* ' Mr. Verduin* Mr* Craig* and to writer* along with Mr. Walter Astook of tto Faint Researsh Bepartnent to sated as interpreter* spent son* three hours with ttosa two representatives* ton offieiel capacities era indicated belows Dr. Irish A. Seeker, Direotor of too Laboratories off the Lithepme-Koator* and President of the Group "pigsant 7 and BeSto* of tto Soolety of German Chemists*3S| ' Woerfch-gtra***, Celoggo* 36 (Western Germany)* aad - Dr' Frits' Wfetoff* Mreetor of tto laboratories off the . Association of daman toad Figment Manufacturers* 2fe Kestet* Boee-Eh. (Western Geraasf). W* 'discussed tto nanufaature of littopone as practiced in Gemeay and also briefly tha manufacture of basic easbonate of shite lead. Ttof ware high"elasa representative* but preferred to do nor* talking then listening, and this -ma perffeotly satiefaetoqrto ua, as we had to glee ' wary, little information to obtain* I toll**** a considerable taowledge of tto working of tto 'Games, littopau amuffaoture* Tto raport of this mating is attached. Dr. Weber was very tosh interested in obtaining any informs,- tion that to eould on lead pigments* and astod for a opgp of ear paper os oofumed leaded sine oxide. Be further requested a sample of our llthepsae. I personally sea no reason thy we stouldRtt sand than tha samples of littopone and a copy of the paper on leaded sino aside* but be fore doing this thought we had batter clear with you* in view of tto fast that we did hot know that 't^e poliqy was in this regard. Tou will ba interested ta know that thay haws * wary definite reason for aaanfaeturisg law bodied littopone. It la peeullar to their process and they hare tors or less no alternative* however* them is more to it than this* and as Dr* Beohsr indicated* at ana ttoe thay did attaapt to market a median oil absorption type of littopaae and were unable to interest the trad* in its use. Their proeeas is auoh that extremely large ammsota of sodium ohleffid* are present in tto strike* or at least formed during striking. The season for this is toeause they use sine sulfide ores and roast with sodiua chloride* This glees than sine chloride aad eodiua sulfate* The strike is then mad* with bariua sulfide to yield sino aulfide* barim sulfate* and two mole off sodium chloride. Calcination is nade st a 0007-SWP-000006552 N11884 J* 7c HUOB ,-2- July 9 1952 aery lav temperature, 6$cFc This, of course, is possible because of the hi$s sodium ohlorids content. Further details ere given in the attached report, including a method used to manufacture high strength lithepcne* This method of roasting slno sulfide with sodium chloride to form sine chloride cad sodium sulfate should be of internet to us, particularly shea. eossideriag the national Lead process for making siao sulfate* ftoy indicated that llMiopone enjoys a wide use in Europe, particularly ia Germany, both cs anterior ead interior fiaishee beeaase of the look: of oa^etitioa from, titanium interests end. also because of the eearsity of mood. Freatieolly all homes asm constructed of stone, brisk or stuooo, and' as a result exterior' paints assume less i^ertsaoe 2a Germany . .than .in this' oouatry* . They further indicated that there ms only one titanium plant ia Germany aod that this ms operated by Motional head Company in eeopsratiea with German interests before the war, but new apparently ia completely eased by latioaal Lead Company* E6 mould appear team the above that Motional Lead Cospapy's process of makiag sine sulfate mould be ideal far use in Germny with their sine sulfide ores, and oerteinly mould change the picture considerably if they eliriBEfeed the sodim chloride* Mother interesting phase of their prooess:i!*s.<fehe*^theyUsod Turbo..Dryers for both the crude lithopoae and' finished lithepona* These Turbo Dryers are. slnpJy mrticel continuous preseesdryers' utilising steam as a source' of' heat,' and apparently are *ry ffieiot<*:: Their general operation of the lithopcne plant outside of the -utilisation of sine ohlorids in the strike, and the use of Turbo Dryers is net greatly different;from - our' prOoess* . Ihay use no; esntrifugss for elassi-' fioatios, but do use ordinary rake classifiers end hydro-separtEfeors. It is of oars. essential to moh the lithopane beeeuse of the presence of a large amount of sodiun Florida* For this purpose they urn Doe? mashers similar to what m have act Coffayrille in the sine sulfide plant* Further details are given in the attached report of this meting, by Mr# Vordnla* Attached also is a report by Mr* Craig ooverimg the discussion of lead plgmsnt with Dr* Weber. cm.iff Boole*. ee s SBC,Jr* CED JSS GW GW C. S Adms LfilWSffiSfeSSy RECEiVF. - 0007"SWP*000006553 JUL 15 '-*2 ft ' Mineral Products Laboratory ipril 15, 19$2 1*027 - LXTBDKBE Special Reports Conference write Drs. Weber and Becker res Manufacture of LiteepoE* Presents C. E. Adams, W. E Asbsok, F* C. Verduia, Sr* Irish A* Weber end Or* frits Beoter Dr* Water Dr* tester pro technical representativea fkow.Ger- sy la tee Lead .Pigasot and Lithepone industries, respectively. The fol lowing is a suanasy of tea interaatiaa obtained la diseuseioa with Dr. Beeter a tee Games production of Lithepone. .' ' - Germany apparently does set haw a sours* of primary slao ore* , Their sine is obtained as a secondary metal fiten pyrites. , The pyrites is first roasted to produce SQ^ for sulfurio aelfi manufacture. The residues are tesa further prooessed by tee. lithopena anufaeturer to recover tee : siae values. , The slag is roasted wite salt eoeerdimg to this reactions ' . SbB>'2Vsfol> SOb-je ZaCl* I%S04 There was so diseussiee shout tee purification of tea sine liquor. Tte erode'liteopoae is prepared bjr striking with barim hydrosulfide liquor. ZnCls * H%SO* * BaS --* ZnS BaS04 2IaCl Obviously their strike is therefor made and conditioned in tee presence Of a considerable eonoentration of eodiun chloride. This necessitates a raadh neve elaborate washing cycle.than we employ, ted for this they use Dorr thlsteser** They do sot dry either their-crude lithopono slurry or their wet-milled liteopane slurry is rotary kilns, hut in special "Turbo-Dryers". Dr. tester was very enthusiastic shout the operation sad effioianey of these machines. The Turbo-Dryer is essentially a vertical, rotary, multiple tier, segneated pan arrangement. Turbo fims are mounted in the center of the dryer with tee pans rotating eromd tee fsts and steam coils at tea periphery. The fans move the sir esross the stews coils and thence over the. surfam of the pans. They are top fed end one semper ea cate tier drops the lithepone to the next level. i Because of the effbet of the salt la tee strite, teey oaaaot mate high oil absorption, grades by control of calcination. Ttey calcine only to obtain suttimttm testing strength. - Their edoinatiom temperature is trend 65<JPe. teey do not in fast mate high nil absorption grades 0007-SWP-000006554 N11884.01 because tfcssa is ko market for them, it oas time they a hi^a oil sbeerptlea Itthepoas by a simultaneous strike teeh&ique* hist mere maable to establish & market for cuah s protest. Ebey else /make a high strength iithopcise etetaining shout 60% ZsS, bet by a different technique the used in this country. By eoolimg - 'their sine liquor they frees*' out approsisstely 50$ of the sodite sulfate, fhis is the roasted with barium liquor to obtain a 60$ lithopoae. (1) 22nCl * 2E%S04 'SH9l2g5ie2a Ie.804 + 1%S0% (2) 22nClg HsgS04 * 2BeS---*2&iStB^04 IsSl* 2faCl . Pres the 60$ grade they then make tea'types of lithopon of wari* sue strengths! vis.* 50$ ZnS* UOJl Sag* ete. Ob s type is mads by blending the high etreegS. iithogoea with" single strength. She seecud hjrpe is made by bleiding the M|h strsegfh lithoptee with nsturcl barytas. 0s* ismd type has a lower oil tesorptite thek/tha first. Cltesifisatiom of the wfc-illd product is obtsised with rabr* classifiers ted hydroseparators. They do act as yet esaloy esstslfkgec for lithopos* claseifieatiea in my of their plants. Because of. the limited time. availably-wsf~did not get' a picture of ih*r dry silling equipment. Bsere ie esp^watly mly me tit^isa plant in Germesy, -teieh before the war; was co-operated by Hetimsl head Os. Ad German interests* but mow is omad eMpletsly by latieaal Lead. IMa lack of eoapetitlea from titanium rfsklts.ik- a wider application of lithopcae to paints is Gerstey. Lithopos* is. used ia both exteriorted interior finishes. How ewer* beoause of the' scarcity of wood* practically all hoses are of atoms* briok or stueoo casetruetieaj ted exterior paints assume less issportene# in emaay thaa in this o^fegy. - F. C. Verduiatff cos SBSjtJr. JtH CEB JBB GW GW 0. S. Adtes Mineral Products Laboratory { 0007-SWP-000006555