CA1117557A - Process for the preparation of portland cement clinker - Google Patents
Process for the preparation of portland cement clinkerInfo
- Publication number
- CA1117557A CA1117557A CA000312689A CA312689A CA1117557A CA 1117557 A CA1117557 A CA 1117557A CA 000312689 A CA000312689 A CA 000312689A CA 312689 A CA312689 A CA 312689A CA 1117557 A CA1117557 A CA 1117557A
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- CA
- Canada
- Prior art keywords
- mix
- stage
- dust
- cakes
- raw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A process for the preparation of portland cement clinker resides in that limey, clayey and iron-containing components are ground together. The mix is then homogenized pelletized, decar-bonized at a temperature of from 800° to 1000° and roasted at a temperature of from 1200° to 1350°C. Dust sublimates which are wastes of the titanium production, are added at the stage of grinding or homogenization in an amount of 0.5 to 6.0% by total weight of raw mix, and or addition of the dust sublimate at the homogenization stage, an aqueous suspension of cakes which are wastes of the titanium and magnesium production and comprise a paste-like mass with a moisture content of 60 to 80% is added at the pelletizing stage, at a volumetric ratio of water to cakes of 3-6:1, and in an amount of 10 to 14% by total weight of raw mix. The process according to the invention enables the preparation of clinker exhibiting an improved strength. With the process according to the invention, the degree of decarbonization of raw mix is as high as 35-50%, and roasting temperature is 120°-150°C
lower.
A process for the preparation of portland cement clinker resides in that limey, clayey and iron-containing components are ground together. The mix is then homogenized pelletized, decar-bonized at a temperature of from 800° to 1000° and roasted at a temperature of from 1200° to 1350°C. Dust sublimates which are wastes of the titanium production, are added at the stage of grinding or homogenization in an amount of 0.5 to 6.0% by total weight of raw mix, and or addition of the dust sublimate at the homogenization stage, an aqueous suspension of cakes which are wastes of the titanium and magnesium production and comprise a paste-like mass with a moisture content of 60 to 80% is added at the pelletizing stage, at a volumetric ratio of water to cakes of 3-6:1, and in an amount of 10 to 14% by total weight of raw mix. The process according to the invention enables the preparation of clinker exhibiting an improved strength. With the process according to the invention, the degree of decarbonization of raw mix is as high as 35-50%, and roasting temperature is 120°-150°C
lower.
Description
)C~ r''Of-' 'r~ ' i'RlI;Lj~Rl~'rI~Jil 0~!' P0'.'i'I,~iJ;~I~
c~ r ~ JK~
rrhe invetl-tion relates -to the ~oroces~ec for the prepa-ration oL' portlancl cernerl-t clinke:L.
'~his portland cemen-t clinker i9 w:idel~ used for the produc-tion o~ high~grade cernents to be used in all construc tion jobs, such as in ~lvuse building, brid~e construct-ion, implementation Oe indus-trial and wat-er engineering projec-ts, and the like.
Stringent re~quiremen-ts are imposed on portland cement clinker. It should exhibi-t a comple~ of certain physical and mechanical ploperties. Irnprovement- of qualit~ of port-land eernent clinker malnl~g depends on the improvement ol' rnanufac-turing process o~ i-ts pxoduc:tion, intensifica-tion Oe production processes~, development oI' radically new7 more efficien-t and economical metnods for the production of por-t-land cernent clinker.
In the production of portland cement clinker, -the com-position o~ raw materials, rnethods of preparing raw ma-terials, processes o~ decarbonization and roas-tin~ o~ raw rnixes are o~ a predominant impor-tance Know~ in t~le art are various processes for the prepa-: ~1175S7 :
c~ r ~ JK~
rrhe invetl-tion relates -to the ~oroces~ec for the prepa-ration oL' portlancl cernerl-t clinke:L.
'~his portland cemen-t clinker i9 w:idel~ used for the produc-tion o~ high~grade cernents to be used in all construc tion jobs, such as in ~lvuse building, brid~e construct-ion, implementation Oe indus-trial and wat-er engineering projec-ts, and the like.
Stringent re~quiremen-ts are imposed on portland cement clinker. It should exhibi-t a comple~ of certain physical and mechanical ploperties. Irnprovement- of qualit~ of port-land eernent clinker malnl~g depends on the improvement ol' rnanufac-turing process o~ i-ts pxoduc:tion, intensifica-tion Oe production processes~, development oI' radically new7 more efficien-t and economical metnods for the production of por-t-land cernent clinker.
In the production of portland cement clinker, -the com-position o~ raw materials, rnethods of preparing raw ma-terials, processes o~ decarbonization and roas-tin~ o~ raw rnixes are o~ a predominant impor-tance Know~ in t~le art are various processes for the prepa-: ~1175S7 :
-2 ration o:E portlar~d oem~3n-t clinker v,lhlch di:eL'er by th~ COM-positlon o:e raw mix, rnet,'locl o:L' bat~hin~ arid homogeneizatiorl, binder nlaterial u~c(l ror pclleti~i ng7 $,asod;~namit, an~l tt,~
perature conditions, various produc ti on s beps us~ed in carry-in6 ou-t the proces~l, an(l a rlumber O:e other Ieatures.
Known in the art is a process :eor the preparation o~
portland ~oement cli~lker, wherein the pxoce3s O:e manu:~acture i3~lntensi~led by mbdi~yin6 the 3teps o:e tht~ process grind-ing~ and homogeneizatlon oI' raw~ mlx are performed in the ae~
carboniz atio n ` ~ zone o ~ a ~ rotary kiI n .
anobher process Ior the preparation o:~` portland eerr e~t-cllnker, ~ln order~ to in~ensL:ey the ~ clinker ~orma~ion process~an;d~ ac~celerate~ th~ decarbonlaatlon proGe3ae~ ad~
ditlonal~ s tt3ps~ are~ ilsed~: ~ thus~ ue~ s ~addition~all;y ~burnt in~ ~the~ là~er~ of ~aterial~ n~ the ~deoarbo~izatlon zone~ Qnd the ~d~eGarbo~nlz~d~ s~ ~abru~ly -heat~ed ~to~ 0_150QC~
PIowff~ver; ,~ these~ ~ prod;eQse~ ~ are assot~ia~3d ~ wi th~ Q ~low~ de~
gr~ee~ o~; deGQr~bo~ lzation Q~d hlg~empe~rQ-t~e~roa ng;~aon~
Enown ~ln ~bhe~ Qrt~ s~a~lso ~Q ~proG~eQQ for the~ preparation~
o~`port:lQnd cement~olln~er~b~ :grind~ing ll~m~3y,~ c~layé~ and iro~-on~aining~ com?one~n-t~; to ~obtain a mix ~whiGh is ~omogeneiz~d and~ pelle~t~i~z e~ o ~ prod~uoe pell ets o~ 8 to l2 mr~ ~size vvi th .. ; ..... . . ..
- , , . : , . ~ . - . , : ,, . . ~ , ~ ~ , , ~ : i , ~ , ~ 7 a moi~;ture conl,enl erom 1~ to 15%. 'l1he mcltericJl is ~hen decarbonized on a caLcirL;~t-ion ~ratcl at ~00 to 1~00C. The ~later'ial i'3 subsecluently fed ~o a roastirlg kiln. '~he roa~-t-ing is ef:Eecied at 1450 -to 1500C.
'l'his process is ~haracterized b~ hig~l thermal e-Pficien-cy, however, in concluctlng the process, 1;he resul-tan-t clink r e~h:ibits inade~uate streng-th because -the process cannot ensure the produc~tion oP high~~treng~th pellets, and rather low de-gree of decarbonization i9 achieved. Beside~, the process features high roasting temperature and speci~ic fuel ~on-~umptio~.
It is an object of the invention to provide a proGess for the prepara-tion of portland cement cllnker, which en-ables the production o~ ~linker exhibiting an improved degree of decarboniza-tion and su~ioient1y high 6trength at lower roastln6 temperature.
In a¢oordance with -this and o-ther o~jects, the invention resides in that in a proce~s for the prepara-tion of portland~
cement clinker acoording to the invention, comprising~grinding ~' limey, clayey and iron~eontainirlgr oomponent~ to obtain a mi~
whlch is 6ub6equently homogeneized, decarbonized at 800C
-to 1000C, and roasted, acGording to -the inventlon, dust slblimate6 ~ waste~ o~ titanium production - are add6d at ..
,, , ' .
.~. , .
~ 5 ~ 7 the grindin~ o~ homo~,eneiz~tion stag~e in arl amount of 0.5 to 6.0~o by total w~ir~,ht o:f raw mi~, and the ro,lstin~., is oonduc-ted a-t 1200 to 1~50C~ an~l~ in ca~e t~e ~us-t ~ubll-mates are ac~da~ at ~he homogerle:izatio~ stage, an aqueous suspension o~ cakes - wa~t~s Oe the -titanium and magnesium production - being added a-t the pelletizing stage in a~
amount o~ 10 to 14% by total weight o~ raw mi~, at a ratio o~ water to ¢ake~ o~ ~-6:1.
Dust sublimates comprise a finel-~ dispersed mlxture o~
~, ~7 ,c /~ns ~hlorides o~ a size ~rom 10 to 100 ~and have the ~ollow-in~ composi-tion in ,0 by weight (in terms o~ oxides and ele-ments): .
~i2 2.0-10.0 FeO 3.0-2000 I~n 2.0-5.0 SiO2 4.0-15.0 ~123 2.~-12.0 CaO 1.0-3.0 ~IgO o, 7_L~ . O
Cr20~; `1 . ?-L~o O
~25 O, 05 L~.0 Cl -11"0-~5.0 0 10.0--25.0 , .
.
3L31 ~L~a5~7 The inixture alæo i.n~lu(les a small arnount o.~ rare-ea~th el eme n ts .
'~he presence Oe f:inel~ dispersed caxbon (petroleum coke) in the Ghloricles ensures good heat conductance of the mix since ~arbon heats the maæs through when burnt over the entire ~olume. ~he presence o~ chlorides Oe Ca, ~e and others ~sublima-tion temperatur~ above ~00C) provides eor a solid~phase decarbonization at temperatures as low as 300 to 500C.
` Adding dust ~ublimate~ in an amount smaller than 0~5%
b~ total weight o~ raw mix at the grinding ætage cannot ensure an lmprovement Oe the degree of deaarbonization and does not lowex~the roaæting temperature, while the use o~ more than 6æ by weight is economically unwarranted.
: ~ In Gase dust:sublimates are added at the homogeneiza~
~tion stage,:~oertain components o~ the~dusb sublimates react - wlth carbona-tes Oe raw mi~. ~his results in a~better degree : o~ decarbonlzation.
A~queous suspension o.~ oake added at the pelletiz:ing stage~comprises a pa'ste-like mass with a moist~ure ~conten~t o~60`to~0%.~ The ~akes - wasteæ Oe the titanium~and ~ma~ne-~ sium produotion - have the :eollowing chemical compo~ition : ~ (based~on dry mass), % by weight: .
:
, ::
- .
-s~
~ 2.0~
'~1iO l~0-13.0 ~ ~ . 0-10 . O
Al20~ 7.0-lO.O
Si2 7-0~30.0 CaO 15,0-30.0 CaCl2 5,0-13,0 CaCO~ ~ 20~0~50,0 MnO 0~18-30.0 MgO 50l-9.0 2 5 0.12-0~0 Cr203 0,30~0.80 S 0.3~1,5 Cl 3,0-IO~O
water to 100.
Owinr, to the presen¢e o~ Sl a Ca and Al in the composi-tion o~ cakes, -they are a good binder. '~hsir use in the form o~ an a~ue~ous suspension in an amount ~rom 10 to 14% by totsl wsip,ht o~ raw mix ensures hi~h strength o~ pel1ets whlch, in turn, contributes to a stabili-ty o~ gasodynami~ ancl tem-perature conditions during the roasti nK o~ pellets.
Ths sdlsctsd volume-tric ra-tio O:e ~ak~3 to water, and ' . ' ,.
~ . ~
~' ~ , ,,, ,;
the amourlt o~ -the a~ueou. sllspens:ion used are optirnum as t~ey ellsur~) u ~leslred ~trerlljth o~ peilletc" and the ma~s does nc~t conglo~lerate at -the pe~lle-l,izing stalr~e.
'~he process eor t~e preparation o~ portland cement clinker aGcordin~,- to -the inverltion has a num~3er o~ a~lvan-tages over the prior art processes. '~hus the degree O:e decarboni-zation o~ raw ~rli~ a-ttains ~5-50~0 wlth the process according to -the inven-tion, which is 50~ grea-ter compared to prlor art, and roasting temperature is, respec-tively, lowered by 120 to 150G. 'I'his r~sults in ~uel savings bg 17-~4% Through-put capacity o~ kilns is irnproved by ll~L~%. l'iloreover 7 add-in~ an aqueous suspension o~ ¢akes at the pelletizing stage enables the produotion o~ clinker o~ higher strength owing to an increased void ratio and strength o~ pellets which are 3-10% greater.
r~he ~ro¢ess is si~ple in manu~acture~ and lS conducted in the ~ollowing manner.
~ inel-~ divided and dried limey Gomponen-t, clayey and iron-corltaininp, components, as well a~ dust sublimates -wastes o~ the titanium production - are charged lnto a ball After the grinding, the resuL-tant raw mix ~is ~ed to adjustin~ blns ~or homogeneization, an~ then, to a plate pelletizer to which water is ~ed through injection nozzles.
:
.
75~
--~3 ~t~S a reslllti, pellets o~ to 12 mrll ;:iZe are ~roduced. 'rhe re~ultant peL.Lel;s aLe then :ee(l to a cal¢irlatiorl g:rate to be decarbonize~, a~ter ~ ryin~ by ~5-~ o at 700 to 1000C.
Subsequently the pellets a.re fed to a Lepol kiln havi~g con-veyor ~ypa calc:ina-tors :eor roa~-tirlg at 1200C to 1~50C.
I~ anotl:ler embodiment dust subliraates - was-te~ o~ thee titaniurn production - are ~ed to adjusting bins~ and an aqueous suspension of' cakes - wastes o~ the titanium and mag-nesium pro~uction - is ~ed -to the pelletizing stage, rather than water.
~ he invention will be bettar unders-tood frorl the follow~
ingspeci~ic examples.
E~ample 1 Limestone was preliminarily cornminuted in a jaw breaker and then in a hammer mill, then dried to moisture con-tent 5~0.
Clay was also drled to moisture con-tent 5~0. ~hen the lime-s-tone~ clay, ore dust and dust sublima-tes in an amount o~
0.5% by total weigh-t o~ raw mi~ were charged into a ball mill. The ground mi~ was ~ed to adjusting bi~s ~or homogene-ization to prepare a raw mi~ o~ a homo~eneous chemical compo-sibion. The homogeneous mix was fed to a plate pelletizer, to which water was also ~ed through injection nozzles. As sæ~
a re~ult, pcllets ol' ~ to 12 rrlrn sizcl v~ere~ produccd. ~he r~el~
le~ts w~re :~eci to t;~lf.' calcirltl tion grate ~or a heat treatrnen-t at 1000C, the degree o~ deearborlization bein~ 35%0 Ax~er decarbonization the pelle-ts Ped to a Lepol kiln having conve~or-t,ype calcinators ~or roasting. ~'he roasting was conducted at 1~50 C.
The resultant clinker had a strength ol~ 480 kgf/Gm2, E~ample 2 Portland cemer1t clinker ~as prepared as described in Example 1, bùt the dust sllblimates were ~ed in an amount o~
4% b~ total weight o~ raw mi~ the temperature o~ decarbo-nization o~ pellets was 900C~ ancl degree o~ decarboniz~tion was 40~0. Ro~stin~ was conduo-ted at 1300C.
~ he resultant portland cemen-t clinker had a strenp;-th of~ Ll 95 kgi~/Gm .
E~ample 3 Por-tland cemen-t cllnlrer was prepared as descxibed in ~ample 1, bu-t ore dust was replaced by p~rite cinder, dust sublimates were ~ed in an amount o~ 6% by total weighb of raw ~ix, tempera-ture o~ decarbo~ization of pellets was 800C~ and~clegree O:e decarbonization was 50~0. Roastin6 was conducted:at~l200C. ~'he resultant clinker had a s-tre~th Or 490 k~-/em2.
.
.
~10--~xalnpl.e ~1 Li~rle~.storle was ~;r:ounci in a j~ fJ brea~er arld in a harrl,fDer mill, ana was -then ~ed Lor clryin~s t-o rnoifs-tur?-, content 5%.
Clay was also dried to moisture content 5%. Subsecluenkl~s the limestone, clay and ore dust were ¢harged into a ball mill. l'he comminu-ted mix and du~t su7~1irllates in an amoun-t o~ 0~5% b~ total weiKht o~ raw rni~ were ~ed -to adjusting bins ~r homogeneizatioYl to a obtain raw mix of homogene-ous chemical composition. 'l'he homogeneized mi~ was ~ed to a pla-te pellet-izer -to which an aqueous suspension o~ cakes was ~ed at a volurnetric ratio o~ water to cakes o~ 3:1, in an amoun~t o~ 10% by total wei~ht o~ the raw mi~. As a result, pelle-ts o~ 8~ to 12 m size were produ~ed. 'l~he pel-lets ware then ~ed to a Galcination gra~e ~or a hea-t treat-ment at 1000 C, th~ de~-ree o~ decarbonL~dtlon beinB 35~o-A~ter de~arboniza-tion the pelle-ts ~ere ~ed to a ~epol kiln havin6~con~eyor--t~pe calcina~tors ~or roasting~. Roasting was conduc:ted at 13~0 C.
'~he resul-tant clinker had a strength o~ 480 kg~/~m2.
~gample 5 Por-tland cemen-t clinker was prepared afs described in E~ample 4, but dust sublimates were added in an amoun-t o~
370 b~ total welght o~ raw mi~, decarbonization o~ pellets . - - ~ , .
.
' was conducted a-t 900C, an aclueou-, su3pen.sion Oe cakes vJas :eed at a volumet:iic ratio v/ater to ca:k.es o:e 5:1~ in an ar~ourlt o:e ll,Yo b~ to l;a:L wei~ o:L' ti~lr~J raU'J mlx 7 the degree of decar~
bonization was 427io'~ an~ roasting ter,aperature wa~ 1300C, The resultan-t clinker had a streng-th o~ 495 kg~/cr ~xampl e 6 Porl-,land cement clinker wa5 prepared a~3 de~;cribed in ample 4, bu~ dus t sublimates were :eed in an amount Oe ~0 by total weight Oe raw mi~, pellet decarbonization -temper~
ture was ~300C, an aqueous swspension o:~ cakes ~was eed a-t a volumetric ratio o~ Jater -to cakes of 6 :1~ in an amount o~ 14% by total weight oLi -the raw mix, the degree Oe decar-bonization was 50%, and ro~sing tempera-ture was 1200 C.
'~he resul-tan-t Gllnker had a strength Oe 5~0 kge/cm
perature conditions, various produc ti on s beps us~ed in carry-in6 ou-t the proces~l, an(l a rlumber O:e other Ieatures.
Known in the art is a process :eor the preparation o~
portland ~oement cli~lker, wherein the pxoce3s O:e manu:~acture i3~lntensi~led by mbdi~yin6 the 3teps o:e tht~ process grind-ing~ and homogeneizatlon oI' raw~ mlx are performed in the ae~
carboniz atio n ` ~ zone o ~ a ~ rotary kiI n .
anobher process Ior the preparation o:~` portland eerr e~t-cllnker, ~ln order~ to in~ensL:ey the ~ clinker ~orma~ion process~an;d~ ac~celerate~ th~ decarbonlaatlon proGe3ae~ ad~
ditlonal~ s tt3ps~ are~ ilsed~: ~ thus~ ue~ s ~addition~all;y ~burnt in~ ~the~ là~er~ of ~aterial~ n~ the ~deoarbo~izatlon zone~ Qnd the ~d~eGarbo~nlz~d~ s~ ~abru~ly -heat~ed ~to~ 0_150QC~
PIowff~ver; ,~ these~ ~ prod;eQse~ ~ are assot~ia~3d ~ wi th~ Q ~low~ de~
gr~ee~ o~; deGQr~bo~ lzation Q~d hlg~empe~rQ-t~e~roa ng;~aon~
Enown ~ln ~bhe~ Qrt~ s~a~lso ~Q ~proG~eQQ for the~ preparation~
o~`port:lQnd cement~olln~er~b~ :grind~ing ll~m~3y,~ c~layé~ and iro~-on~aining~ com?one~n-t~; to ~obtain a mix ~whiGh is ~omogeneiz~d and~ pelle~t~i~z e~ o ~ prod~uoe pell ets o~ 8 to l2 mr~ ~size vvi th .. ; ..... . . ..
- , , . : , . ~ . - . , : ,, . . ~ , ~ ~ , , ~ : i , ~ , ~ 7 a moi~;ture conl,enl erom 1~ to 15%. 'l1he mcltericJl is ~hen decarbonized on a caLcirL;~t-ion ~ratcl at ~00 to 1~00C. The ~later'ial i'3 subsecluently fed ~o a roastirlg kiln. '~he roa~-t-ing is ef:Eecied at 1450 -to 1500C.
'l'his process is ~haracterized b~ hig~l thermal e-Pficien-cy, however, in concluctlng the process, 1;he resul-tan-t clink r e~h:ibits inade~uate streng-th because -the process cannot ensure the produc~tion oP high~~treng~th pellets, and rather low de-gree of decarbonization i9 achieved. Beside~, the process features high roasting temperature and speci~ic fuel ~on-~umptio~.
It is an object of the invention to provide a proGess for the prepara-tion of portland cement cllnker, which en-ables the production o~ ~linker exhibiting an improved degree of decarboniza-tion and su~ioient1y high 6trength at lower roastln6 temperature.
In a¢oordance with -this and o-ther o~jects, the invention resides in that in a proce~s for the prepara-tion of portland~
cement clinker acoording to the invention, comprising~grinding ~' limey, clayey and iron~eontainirlgr oomponent~ to obtain a mi~
whlch is 6ub6equently homogeneized, decarbonized at 800C
-to 1000C, and roasted, acGording to -the inventlon, dust slblimate6 ~ waste~ o~ titanium production - are add6d at ..
,, , ' .
.~. , .
~ 5 ~ 7 the grindin~ o~ homo~,eneiz~tion stag~e in arl amount of 0.5 to 6.0~o by total w~ir~,ht o:f raw mi~, and the ro,lstin~., is oonduc-ted a-t 1200 to 1~50C~ an~l~ in ca~e t~e ~us-t ~ubll-mates are ac~da~ at ~he homogerle:izatio~ stage, an aqueous suspension o~ cakes - wa~t~s Oe the -titanium and magnesium production - being added a-t the pelletizing stage in a~
amount o~ 10 to 14% by total weight o~ raw mi~, at a ratio o~ water to ¢ake~ o~ ~-6:1.
Dust sublimates comprise a finel-~ dispersed mlxture o~
~, ~7 ,c /~ns ~hlorides o~ a size ~rom 10 to 100 ~and have the ~ollow-in~ composi-tion in ,0 by weight (in terms o~ oxides and ele-ments): .
~i2 2.0-10.0 FeO 3.0-2000 I~n 2.0-5.0 SiO2 4.0-15.0 ~123 2.~-12.0 CaO 1.0-3.0 ~IgO o, 7_L~ . O
Cr20~; `1 . ?-L~o O
~25 O, 05 L~.0 Cl -11"0-~5.0 0 10.0--25.0 , .
.
3L31 ~L~a5~7 The inixture alæo i.n~lu(les a small arnount o.~ rare-ea~th el eme n ts .
'~he presence Oe f:inel~ dispersed caxbon (petroleum coke) in the Ghloricles ensures good heat conductance of the mix since ~arbon heats the maæs through when burnt over the entire ~olume. ~he presence o~ chlorides Oe Ca, ~e and others ~sublima-tion temperatur~ above ~00C) provides eor a solid~phase decarbonization at temperatures as low as 300 to 500C.
` Adding dust ~ublimate~ in an amount smaller than 0~5%
b~ total weight o~ raw mix at the grinding ætage cannot ensure an lmprovement Oe the degree of deaarbonization and does not lowex~the roaæting temperature, while the use o~ more than 6æ by weight is economically unwarranted.
: ~ In Gase dust:sublimates are added at the homogeneiza~
~tion stage,:~oertain components o~ the~dusb sublimates react - wlth carbona-tes Oe raw mi~. ~his results in a~better degree : o~ decarbonlzation.
A~queous suspension o.~ oake added at the pelletiz:ing stage~comprises a pa'ste-like mass with a moist~ure ~conten~t o~60`to~0%.~ The ~akes - wasteæ Oe the titanium~and ~ma~ne-~ sium produotion - have the :eollowing chemical compo~ition : ~ (based~on dry mass), % by weight: .
:
, ::
- .
-s~
~ 2.0~
'~1iO l~0-13.0 ~ ~ . 0-10 . O
Al20~ 7.0-lO.O
Si2 7-0~30.0 CaO 15,0-30.0 CaCl2 5,0-13,0 CaCO~ ~ 20~0~50,0 MnO 0~18-30.0 MgO 50l-9.0 2 5 0.12-0~0 Cr203 0,30~0.80 S 0.3~1,5 Cl 3,0-IO~O
water to 100.
Owinr, to the presen¢e o~ Sl a Ca and Al in the composi-tion o~ cakes, -they are a good binder. '~hsir use in the form o~ an a~ue~ous suspension in an amount ~rom 10 to 14% by totsl wsip,ht o~ raw mix ensures hi~h strength o~ pel1ets whlch, in turn, contributes to a stabili-ty o~ gasodynami~ ancl tem-perature conditions during the roasti nK o~ pellets.
Ths sdlsctsd volume-tric ra-tio O:e ~ak~3 to water, and ' . ' ,.
~ . ~
~' ~ , ,,, ,;
the amourlt o~ -the a~ueou. sllspens:ion used are optirnum as t~ey ellsur~) u ~leslred ~trerlljth o~ peilletc" and the ma~s does nc~t conglo~lerate at -the pe~lle-l,izing stalr~e.
'~he process eor t~e preparation o~ portland cement clinker aGcordin~,- to -the inverltion has a num~3er o~ a~lvan-tages over the prior art processes. '~hus the degree O:e decarboni-zation o~ raw ~rli~ a-ttains ~5-50~0 wlth the process according to -the inven-tion, which is 50~ grea-ter compared to prlor art, and roasting temperature is, respec-tively, lowered by 120 to 150G. 'I'his r~sults in ~uel savings bg 17-~4% Through-put capacity o~ kilns is irnproved by ll~L~%. l'iloreover 7 add-in~ an aqueous suspension o~ ¢akes at the pelletizing stage enables the produotion o~ clinker o~ higher strength owing to an increased void ratio and strength o~ pellets which are 3-10% greater.
r~he ~ro¢ess is si~ple in manu~acture~ and lS conducted in the ~ollowing manner.
~ inel-~ divided and dried limey Gomponen-t, clayey and iron-corltaininp, components, as well a~ dust sublimates -wastes o~ the titanium production - are charged lnto a ball After the grinding, the resuL-tant raw mix ~is ~ed to adjustin~ blns ~or homogeneization, an~ then, to a plate pelletizer to which water is ~ed through injection nozzles.
:
.
75~
--~3 ~t~S a reslllti, pellets o~ to 12 mrll ;:iZe are ~roduced. 'rhe re~ultant peL.Lel;s aLe then :ee(l to a cal¢irlatiorl g:rate to be decarbonize~, a~ter ~ ryin~ by ~5-~ o at 700 to 1000C.
Subsequently the pellets a.re fed to a Lepol kiln havi~g con-veyor ~ypa calc:ina-tors :eor roa~-tirlg at 1200C to 1~50C.
I~ anotl:ler embodiment dust subliraates - was-te~ o~ thee titaniurn production - are ~ed to adjusting bins~ and an aqueous suspension of' cakes - wastes o~ the titanium and mag-nesium pro~uction - is ~ed -to the pelletizing stage, rather than water.
~ he invention will be bettar unders-tood frorl the follow~
ingspeci~ic examples.
E~ample 1 Limestone was preliminarily cornminuted in a jaw breaker and then in a hammer mill, then dried to moisture con-tent 5~0.
Clay was also drled to moisture con-tent 5~0. ~hen the lime-s-tone~ clay, ore dust and dust sublima-tes in an amount o~
0.5% by total weigh-t o~ raw mi~ were charged into a ball mill. The ground mi~ was ~ed to adjusting bi~s ~or homogene-ization to prepare a raw mi~ o~ a homo~eneous chemical compo-sibion. The homogeneous mix was fed to a plate pelletizer, to which water was also ~ed through injection nozzles. As sæ~
a re~ult, pcllets ol' ~ to 12 rrlrn sizcl v~ere~ produccd. ~he r~el~
le~ts w~re :~eci to t;~lf.' calcirltl tion grate ~or a heat treatrnen-t at 1000C, the degree o~ deearborlization bein~ 35%0 Ax~er decarbonization the pelle-ts Ped to a Lepol kiln having conve~or-t,ype calcinators ~or roasting. ~'he roasting was conducted at 1~50 C.
The resultant clinker had a strength ol~ 480 kgf/Gm2, E~ample 2 Portland cemer1t clinker ~as prepared as described in Example 1, bùt the dust sllblimates were ~ed in an amount o~
4% b~ total weight o~ raw mi~ the temperature o~ decarbo-nization o~ pellets was 900C~ ancl degree o~ decarboniz~tion was 40~0. Ro~stin~ was conduo-ted at 1300C.
~ he resultant portland cemen-t clinker had a strenp;-th of~ Ll 95 kgi~/Gm .
E~ample 3 Por-tland cemen-t cllnlrer was prepared as descxibed in ~ample 1, bu-t ore dust was replaced by p~rite cinder, dust sublimates were ~ed in an amount o~ 6% by total weighb of raw ~ix, tempera-ture o~ decarbo~ization of pellets was 800C~ and~clegree O:e decarbonization was 50~0. Roastin6 was conducted:at~l200C. ~'he resultant clinker had a s-tre~th Or 490 k~-/em2.
.
.
~10--~xalnpl.e ~1 Li~rle~.storle was ~;r:ounci in a j~ fJ brea~er arld in a harrl,fDer mill, ana was -then ~ed Lor clryin~s t-o rnoifs-tur?-, content 5%.
Clay was also dried to moisture content 5%. Subsecluenkl~s the limestone, clay and ore dust were ¢harged into a ball mill. l'he comminu-ted mix and du~t su7~1irllates in an amoun-t o~ 0~5% b~ total weiKht o~ raw rni~ were ~ed -to adjusting bins ~r homogeneizatioYl to a obtain raw mix of homogene-ous chemical composition. 'l'he homogeneized mi~ was ~ed to a pla-te pellet-izer -to which an aqueous suspension o~ cakes was ~ed at a volurnetric ratio o~ water to cakes o~ 3:1, in an amoun~t o~ 10% by total wei~ht o~ the raw mi~. As a result, pelle-ts o~ 8~ to 12 m size were produ~ed. 'l~he pel-lets ware then ~ed to a Galcination gra~e ~or a hea-t treat-ment at 1000 C, th~ de~-ree o~ decarbonL~dtlon beinB 35~o-A~ter de~arboniza-tion the pelle-ts ~ere ~ed to a ~epol kiln havin6~con~eyor--t~pe calcina~tors ~or roasting~. Roasting was conduc:ted at 13~0 C.
'~he resul-tant clinker had a strength o~ 480 kg~/~m2.
~gample 5 Por-tland cemen-t clinker was prepared afs described in E~ample 4, but dust sublimates were added in an amoun-t o~
370 b~ total welght o~ raw mi~, decarbonization o~ pellets . - - ~ , .
.
' was conducted a-t 900C, an aclueou-, su3pen.sion Oe cakes vJas :eed at a volumet:iic ratio v/ater to ca:k.es o:e 5:1~ in an ar~ourlt o:e ll,Yo b~ to l;a:L wei~ o:L' ti~lr~J raU'J mlx 7 the degree of decar~
bonization was 427io'~ an~ roasting ter,aperature wa~ 1300C, The resultan-t clinker had a streng-th o~ 495 kg~/cr ~xampl e 6 Porl-,land cement clinker wa5 prepared a~3 de~;cribed in ample 4, bu~ dus t sublimates were :eed in an amount Oe ~0 by total weight Oe raw mi~, pellet decarbonization -temper~
ture was ~300C, an aqueous swspension o:~ cakes ~was eed a-t a volumetric ratio o~ Jater -to cakes of 6 :1~ in an amount o~ 14% by total weight oLi -the raw mix, the degree Oe decar-bonization was 50%, and ro~sing tempera-ture was 1200 C.
'~he resul-tan-t Gllnker had a strength Oe 5~0 kge/cm
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for the preparation of portland cement clinker, comprising grinding limey, clayey and iron-containing components; homogenizing the resultant mix; pelletizing the resultant homogenized mix; decarbonizing the resultant pellets at a temperature from 800° to 1000°C; roasting said pellets at a temperature from 1200° to 1350°C; adding at the grinding or homo-genization stage dust sublimates, which are wastes of the titanium production in an amount from 0.5 to 6.0% by total weight of raw mix, and in addition of the dust sublimates at the homogenization stage, adding, at the pelletizing stage, an aqueous suspension of cakes which are wastes of the titanium and magnesium production and comprise a paste-like mass with a moisture content of 60 to 80% at a volumetric ratio of water to cakes of 3-6:1, in an amount of 10 to 14% by total weight of raw mix.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU2527656 | 1977-10-05 | ||
| SU772527656A SU698938A1 (en) | 1977-10-05 | 1977-10-05 | Method of producing portland cement clinker |
| SU2551000 | 1977-12-06 | ||
| SU772551000A SU700484A1 (en) | 1977-12-06 | 1977-12-06 | Method of preparing portland cement clinker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1117557A true CA1117557A (en) | 1982-02-02 |
Family
ID=26665637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000312689A Expired CA1117557A (en) | 1977-10-05 | 1978-10-04 | Process for the preparation of portland cement clinker |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5473822A (en) |
| CA (1) | CA1117557A (en) |
| DE (1) | DE2843128C2 (en) |
| FR (1) | FR2405223A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107417144A (en) * | 2017-08-31 | 2017-12-01 | 黄志德 | The method that low calcium matter complex cement raw material produces portland cement |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4224077A (en) * | 1978-05-10 | 1980-09-23 | Olifer Vladimir P | Raw mix for the production of portland cement clinker |
| US6709509B2 (en) | 2001-06-05 | 2004-03-23 | Ernest John Taylor-Smith | Portland cement manufacture from slag from the production of magnesium metal |
| AU2002351569A1 (en) * | 2002-12-05 | 2004-06-23 | Newtech Commercialization Ltd. | Portland cement manufacture from slag from the production of magnesium metal |
| JP4515865B2 (en) * | 2004-08-12 | 2010-08-04 | 株式会社エーアンドエーマテリアル | Treatment method for inorganic waste |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR591653A (en) * | 1925-07-16 | |||
| FR325374A (en) * | 1902-10-17 | 1903-04-27 | A Rouzet Et Cie Soc | Manufacturing process of artificial portland cements with siliceous and low alumina limestones |
| US2793958A (en) * | 1955-01-21 | 1957-05-28 | Sun Oil Co | Manufacture of cement |
| FR2231635A2 (en) * | 1972-09-19 | 1974-12-27 | Kurz Fredrik W A | Glass and cement reinforcing additive - contg filter or flue gas dust |
-
1978
- 1978-10-03 DE DE19782843128 patent/DE2843128C2/en not_active Expired
- 1978-10-04 CA CA000312689A patent/CA1117557A/en not_active Expired
- 1978-10-04 FR FR7828359A patent/FR2405223A1/en active Granted
- 1978-10-05 JP JP12212078A patent/JPS5473822A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107417144A (en) * | 2017-08-31 | 2017-12-01 | 黄志德 | The method that low calcium matter complex cement raw material produces portland cement |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2405223B1 (en) | 1982-10-15 |
| JPS5473822A (en) | 1979-06-13 |
| DE2843128C2 (en) | 1983-06-01 |
| FR2405223A1 (en) | 1979-05-04 |
| DE2843128A1 (en) | 1979-04-26 |
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