USRE14773E - Sta spa - Google Patents

Description

cam roir or xonrcnna,

A OOBPOBATION OF. NEW JERSEY.

Y O! OB'I'LII' I IG CEMENT AND SOLUBLE POTASSIUM COMPOUNDS filed Detober 5, 1918. Serial Ila- 857,062.

bination with lime or other calcareous material, for v the production of cementitious bodies, with the simultaneous separation and recover of a large part of'the potassium origina ly contained in the raw material in the form of potassium chlorid, or other potassium compound suitable for use in the various arts.

- The present a plication is a division of my copendmg app lcation, Serial No. 636,118, filed June 29, 1911.

Various ro have heretofore been suggested or producing from potassiumbearin silicate rocks, the 9 0 41 um content thereo in the form of y soluble potassium salts, but so far as I can ascertain most of the processes heretofore proposed were found to be open to certain ob ectlons, and have not come into general commercial use.

As a source of the potasium-bearing mmeral, I can em loy eldspar, orthoclase, or an other suita 1e mineral.

eldspar is particularly suitable as a source of silica in cement mak1ng,' since the silicapresent in the feldspar very easily combines with lime, and the alkah of the feldspar acts as a powerful flux during the heating operation, feldspar alone fus1ng at about 1300 C., while clay requires about 1800 C. Felds at is also particularly suitable for use in t is proces; on account of its low ratio of alumina to sihca, 111 possible the production of cement very high in silicate and low in aluminate.

As thecalcareous material I can use limestone, marl, clay, lime sludgs and'waste, or gypsum, and in addition thereto, or as a substitution therefor, I can use zinc 0nd or carbonate, barium oxid or carbonate, magne- .the materials somewhat friable.

lpeafltaation of ltelssued Letters Patent. Reissu ed Dec. 23, 1919.

' Io mutin Original application fled June 29, m1, seriuso. 036,112. Divided and application filed January 88, 1816, Serial Io. 75,089. Origins-1H0. 1,186,582, dated June 6, 1918. Application for reissue sium oxid or carbonate or dolomite for special-purposes if desired.

I also employ a potassium-volatilizing agent, e. g. a halogen compound, such as cryolite, fluorspa-r, magnesium chlorid, or preferably calcium chlorid. Preference is to be given, in the halogen compounds above NEW JERSEY ASSIGN'OBL T0 ELIE-FOSTER COMPANY,

referred to, to those which are soluble, since such materials can most readily be completely incorporated with the other ingredients of the raw cement mix, for example by applying said halogen compounds in the form of a solution. In this step I preferably add an amount of the calcium chlorid which will contain chlorin in amount approximately equivalent to the total potassium present in the materials. I also referably use about as much water as w 1 be evaporated quickly by the heated materials, to leave a dry material which can be directly introduced .into the inder.

' As a preferred em odiment of the invention, I first. heat together, feldspar and calcareous material, with or without other aluminous or silicious material or both, said mixture being heated, to a temperature at which carbon dioxid is readily driven off from calcium carbonate, which heating may be conducted in a rotary kiln. Thereafter this heated material may be sprayed or quenched with a solution of calcium chlorid, or other halogen compound, which renders Other cement-forming materialscan be added at this point if so desired. The 'startin .materials will be so proportioned as to p 1100 a compositionat this stage of the process, which will have the proper composition for constituting a cement raw-mix. The mixture ofmaterials may then 'be finely crushed, if desired, and is then-rapidly heated to clinkering and preferably to complete fusion. The mixture should be heated sufliciently to completely liquefy the same, which means a temperature of 1300 C., or slightly above this, during which procedure the 1118.]01' portion of the potassium distils off or fumes off, as potassium chlorid (or other halogen salt), after which the fused material is referably subjected to the action of a jet of steam or other fluid to atomize or otherwise comminute the same, and to secure the product in a somewhat filamentous form, which can "a 7 cm.

bereadilyv ground'to the condition of fine alt is vaporized. From the melted mate- "nessusual" m thePortland cement-making rial a further-considerable portion-ob the industry. ---po,tassium salt vaporizes, while the tempera- By virtue oflthe'par'ticular composition of ture of the melt ma remain substantially '5 the raw mix,' the 'clinkeringand fusion" of constant," although e actual fusion point the cement take place at very much lower. .of the massisconstantly rising. During this temperatures than would be the if an". part the=proce the mass remains :hquid, ordinary Portland cement-mix were elm and is m fact in a hvperfused'state; 'ployed, which renders the step of-v fusion of While I have referredto the tassium 10 the cement, both more easy and more pracsalts being vaporized or v0 atilized, tical, since it is not necessary to heat the these terms are to be understood as more or mass twsuch? tem ratures as would-injuriless synonymous with ...fumed ofi,'sinee exously affect the cenient,-:which would perimentsindicate that in manyinstances. be necessarywherrusingan'ordinary cementthe potassium salts exist as a fume rather -15 mix. --than as a. tmeyapor. ,Thus this material'80 a "The gases-and fumes'given'ofl' the step will bexseen to. exhibit a considerable meltv oi-heating the groundmixture to fusion,- andn-mg point hysteresis or lag, which enables particularlyi'during and; after the-commence the otassium salts to be removed while mentof'the fusion step; contain the major avoi ing such hi h temperatures. as would zc' 'portionofthe potassium present/in the mate-: tend to injure t 'e cement, or.'reduce its rials'under'treatment, forexample as tas-. -hydraulicity', by the production of an over- "chlorid; which is distilledo and burned product. The liquid mass-goes to the which mayi'be removed from the-gaseous: atomizer-"jets whileinthis hyperfused state, gmducts in'any suitable way, forpe mple which renderspossible its e si i to a 25 y carryingthe gasesdhroughubaflle chamfilamentous conditiom'readily, ground to a 9'0 bers',-="settling :chambers, or'tapparatus in fine wder:

Which-they are treated-with water sprays A W at I- claim is: h ianrl the like, and theheat ofthese gases and T Process fl fl ing hydraulic cefu qlik i b z. tfliz d;forreoncenment and-potassium compoundswhichcom- --sor trating"the solutions of-potassinmsaltsproprises incorporating potassiumbearin' siliudu'ced' in th m '-ciou s-material withcalcareous materi and The feldspar or similar 'potassiummon a sui iiclent quantityof. calcium ,chlorid to silicious rock andthecalcium'chlorid fllI'IllSh chlorin for the potassium present,

1 to act as'a flu-Iyan'd to aid both fusing the mixture at a temperature of ap fl imthe *production 0f=ce1nent atwelatively proximately 1300 C.,'whereby: potassium low 'temperatures, and in the fusion of the chlorid is formed; -volatilizing .and col- I --leetinq-)l;lt1mpotassium material,.comm-in'uting lt has'heretofore been proposedto employmthesu tially-potassium-free compounds mliates, "including calcium-"sulfate, in the by expos ng-the; molten material to an aque- I 40::prodflct10n0f Portlandcement. mate ous spray and finally grinding the commiria is generally open to-the objection that anted material. v

"the treatment of thejcement-making 2 Thelprocess of making. hydraulic ce-" mammals at high tem eraturesyconsiderablei 'me'nt and potaesiummompounds which comof the suliate mayn reduced to sulfid prises-incorporating potassium-.bearin siliwhidrproduce annnsonndcement. clone-material withtcalcareous materia l and l-zillha matarial 'introduged at the oommancea .quantityof calcium chlorid, vfusing the ment bf theprocessg maybe finely'po'wdered mixture and ifvolatilizing and collecting iii-desired, Shi-flihiflnifl' generally unn ya-the volatilizednmatefial commin'uthe process,-' fragmental substantially-potassium-freematerial y ex-' of considerable site may be utilized, posmg' the molten-material to/an aqueous -wrgdvmagepandtthecrushing-or Lspraymndfifinally grinding the nommlnuted nfter'thficalcining-step is much more eeo- --m 4 V *nomieal. 1 v 3: 'lhe processof making hydraulic ce- 1 Inmase-the'materials-employ'ed are snb-l-anmentv-and potassium compounds which com- 'bflnstantrally hee'from 'iron-(or contain onl. pyisesyincorporating potassium-bearing silivzelatiwely'smali amounts of this element with calcareous material and 'thee. in I rqduced-.may;be white. The: aigiantity oi ealcium.- '=chloi'id,' fusingthe Q} H "-115. f 8 ap- .-i t ,e 955mg? d, f g i omproximatangsthev point of. feldspar, fem-pounds and other-similarly whereh 1pc compounds are liberated,

raw mlm zllumm orid; may -\-vo atil izmgfiandloollect'ingthe potassium beamed; winch will function both-as a halo-- 'mp noomminuting the remaining ce- 5"rg en sallz;and;asaiwhi vagent. =-mentitious'materialby atomizing' themolten M NO 11111611138 show! t t'during thematernal with a pressure jet,1and grinding 06 melting o thecharge some of the comminuted material. v

silicates with calcareous material and cal' cium chlorid, fusing of the mixture at a temperature of about 1300 (1., and volatil1z ing and .collecting the potassium compounds.

5. The process of .making a hydraulic cement and potassium compounds which comprises incorporatin careous material to ma e a cement raw mix and incorporatinv an agent capable of forming relatively vo latile com ounds with the potassium present, fusing t e mixture while employing'a temperature of at least incipient fusion of ap roximately 1300 C., and collecting the su limate.

. 6. The process of'making a hydraulic ccment and potassium com ounds which comprises incorporating iel spar with calcareous material to make a cement raw mix and incorporating a haloid salt of an alkaline earth metal, fusing the mixture while emloying a temperature of at least inci ient usion of approximatelyd1300 (3., an collectin the potassium-bearing sublimatc.

7. I n the production of valuable products from potassium-bearing silicates, the step of fusing together a.mixture comprisin such a silicate, a calcareous materialand a mloid salt of an alkaline earth metal.

8. In the production of cement and 10 tassium-halogen compounds, the step of feldspar with calline earth metal haloid, and distilling therefrom the major portion of the potassium, as a haloid compound thereof.

9. The step of fusing together a calcareous material, a tassium-containing silicate rock and a ha oid compound less volatile than the corresponding otassium-haloid compound, said com ound' reacting with said silicate rock to produce such .potassium halogen compound.

10. Aproccss of making white cement and potassium salts which comprises incorporatmg a mixture comprising a potash-containproduct, a mixture comprising a folds athic rock, a calcareous material and ana ing capable of ing silicate with calcareous material and a potassium volatilizingi agent, 'heatin the mixture to a suificient temperature to volatilize at least the major portion of the potassium present, while producing a fused mass containing silicious calcareous material, and comminuting the same with a pressure jet.

11. 'A rocess of making: a hgdraulic cemen't an potassium salts whic' incorporating potassium-containing silicious material, calcareous material and a potassium volatilizing .agent, heating the mass sufficiently to fuse the mixture and to volatilize at least the major portion of the potassium present in the form of potassium compounds, collecting the said volatilized compounds, andcomminuting the fused material with a pressure jet. CARLETON ELLIS.

comprises