CA1102360A - Raw mix for producing portland cement clinker - Google Patents

Abstract

RAW MIX FOR PRODUCING PORTLAND CEMENT CLINKER
Abstract of the Disclosure According to the invention, the raw mix for producing portland cement clinker comprises a lime component, a clay component, an iron-containing component and a modifying agent.
The latter is a cake byproduct readily available at titanium and magnesium works. The percentage by weight composition of the mix is as follows:
lime component, 88.3 to 77.8 clay component, 9.2 to 11.2 iron containing component, 2.0 to 5.0 modifying agent, 0.5 to 6.0 The raw mix according to the invention possesses better properties than conventional mixes. For example, its plasticity is 140 to 160 units, and the degree of mineralization is as high as 19 percent.

Description

~ 3 ~ O

1~ Ti~le of the Invention 20 Ficld o~' the I~ve~io~
~ he present inventi3~ r~lates t~ t~e production of buildin~
materials and the cement i.ndustryO Morfl partic~larl~9 ~he i~ven-tlon relates to raw mixes for produci~ portland cement clinker~
Such mixes must meeb a ~mb~r of ~tringent requireme~bs.
The~ must possess a des~red combi~ation o~ physlco-chemical and mechanical pxopertie~9 i~cludi~g a c~xtain degres o~ pla~-bicit~ sbr~ng~h and poro~ , so a~ to be fit ~or th~ produc-tio~ o~ qualitg cli~kcr.
3. Backgro~d o~ thc In~antion Thcxe are known raw m~%e~ ~or producing por~land cem~nt ~ .
cli~ker, which cor~tai~ variou~ modifgi~g a~enbs in additio~ ~o ~helr ba ic i~gredien~s., ~he m~di~yi~ a~s~ts ara meant tD CC)rl-trol ths properti~3~ o~ t~s mixes and ~ose of the cli~ker in~o which the~ are mads.
ModiIying agents used i~ ~h~ production o~ porbland cement clinker i~clude a num~er OI nabural products~ such a~
dia'Gomite, ~u~a and pumice, ~Iow~-3ver~ it is mor3 econ~mical to use ~vaste prod~c~s and byprod~cbs of c~rkain ind~s~ries5 suc~
as metall ar~y, the chemical indll~try3 ebc.
~ ere are knDv~n raw mix06 ~or produci~g portla~d cement clinker, w~ich comprise a carbonabs compD~ent~ a cay comps~ent and an iro~-containi~g c~mponen~O ~;e modifyi~g agent is bla~t Iurnac~ dust (c~. ~u. M. ~ubbt V.V. ~imashev ~ "PDrtlandtsemant~
clinker" /'~ortland Ceme~t Cli~ker"/ 9 Gosudar~bve~oye Izdatel-'~

~ 3~ , stvo litaratury pG stroitelstvu~ ar~hitokture i stroit~l~ymrnat~rialam /State Publishing EIouse ~or Literatur~ on Building~
Archi~ecturo and Building Materials/3 Moscow, 1967~ e modifying agent may also be phosphogypsum which is a b~product o~ the phosphoric acid produc~ion (c~0 USSR Inventor' s Certl~
oat~ No.501~0~7~ or a byproduc~ oE the productiDn o~ 50da containing ? percent of CaCl2 (cf. ~SSR Inventor's Certi-ficate No,3269152)~
Tha above raw mix3s are ext~nsi~ely usod to produc0 clinker o~ a su~iciently ~igh strengtb and degree D~ mineraliza~
tio~9 as w~ll as a r~duced por4slty~
I~ additiun? modi~ying agents belp to increas~ the extent of decarbonizati.D~ ~f raw mi~es and int~nsi~y t~e ~iri.ng prDcess.
Howevar, none o~ ~be cD~entiDnal m~di~ying age~ts can pro-~duca a combi~ati~r~ OI desired propertis3 in a raw mix and clinker into which it is made"
~ hexe is known a ~aw mi~ ~3X prod~cing portland cema~b7 comprising a carbo~ate compo~e~t9 a clay compon~nt~ a~ iro~
co~tai~ing compone~b a~d a mineraliz3r which ~8 a mixbure o~ magnesium carbonate and calolum ~ul~abe. The poroe~tag~ b~
weig~t compositiQn of the mix u~der review is as ~ollows:
lim~ componont9 70 to 82 clag component9 15 to 19 iron-containing cDmponent~ 2 to 5 modi~ying age~t, 1 to 10 (CL . USSR Inv~ntor' ~ Certl~icate ~o~ 485~986) ~
This rnix posses~es a w~ole complex OI usaIul prDperti0s;
besida~9 tha abovq-mentionod modi~ier mak3s lt possi'ole to reduce the firing temperature. Y~t the min~ralizatio~ and plasticitg o~ t~e mix are inadeguate 1~ whicb ~,ually applied t;o bl~e strengbb and porosity OI bhe olinker produced ~rom t~is mix .
4,. Summax,~ D~ t33e I~vention It i~ an ob~ec~ o~ bhe prese~b inventio~ to provide a raw mix for producing portla~d cemen~ clinker~ w~ would tur0 a CDlnbin~tiO~l OI u5e~ul properbies, including a~
increased stre~gt~, pla~ticity and degree o:E mi~eralizati~n, and a ~educed p~rosit,~.
c th~ accomplishment o~ t~e ~orcg~ing a~d related l:)bje<:tSD:
the inventi3~ corlsist~ in pro~tidin~ a raw mix comprising a lime comporla~t9 a clay compDnent, an iron-contalni~g component and a modi~yirlg agent,, whic~ is c~aract~rized~ acco~di~g to ~e inve~tion, i~ t~at t~e modii~yi~ age~b i~ a caka b,~product o~ e ~itanium and ma~Sn~sium prod~lctio~ thc percentage b~ weight compositlo~ o~ thc mix bei~g a~ ~ollows:
lime compo~ent? 88~13 ~o 77.8 clay compor~ent, 9.2 to '1?.2 iro~-cD~tainin~; compone~t" 200 to 5~0 mod~fyi~g agent, oO5 bo 6~0~, _Ll~

~.

1'he lime component mag be limastone, chalk or marl. ~e clay CDmponen~ i5 difIeratlt type~ o~ cla~; and loam~. ~h~
irD~con~ainirl~ componont iCI pgrite cind~r~ h0matit~ or ore d uqt O
As statied. aboveg the mDdi~ing a~enb is cake which is a b,yproduct readily avail~ble at tit~ium and magnesium work3.
Caka i5 a mul~icomponen~ pasty mixture witb a moistur0 content of 60 to 70 percent.
~e parcer~age by woig~t composition of dry cake i5 as foll~ws~
C~ 2.0 to 6~,0 Dll~309 5.1 to 9~,0 ~iO2~ 10.0 to 13~0 :MnO~ 06,18 to 30.0 ~o" 2.0 to 10.0 A1203, 7~,0 to 10.0 V~05 0,12 to 0.40 SiO2~ 7.0 to 30yO Cr203~ 0.30 to 0. 8() CaO7 15.0 ~o 30.0 5, 0.09 ~o` 1~5 CaC12~ 5~,0 to ~13.0 Cl" 3- to 1()~0 Ca C03 1 20 . O t o 50 ,7 0 T~ ype o~ ca}~ also inc:lude~ small amDun~s ~I ~are -3~rths 0 T~e mul~icomponent compDsibion OI ~he cak~ accou~s Xor good pr~per~ie~ o~ bhe raw miæ and clinker. FDr ~xample~ io~s o~ chlori~e are co~ducive to ~e ~orma~ion of crystal ~uclei and ~h9 g~owt~ of orystals of minera~s~ which, in turna in"e~si~ s t~e clinker ~ormation process. Io~s o~ ~orine and CaO have a positive e~fect o~ the plasticit,~ of the raw miY~9 as well as on the strength a~d por~sit,q OI gra~ule3.
~ 1 03 enhance~ the reactivit~ OI the mix7 becau~e as a fre~ oxide9 Al203 is a ~i~ely disper3ed material and thus accou~ts îor improYed strength characteristic~ of the raw mix and cl inker.
~ he raw mix according to the i~ve~tion pos~e3ses b~tter ph~sico-chemical and :mechanical properties than cDnventiDnal mixes u~ed ~or the productio~ of portland ceme~t cli~ker.
~or example ~ t~e plastic inda~ o~ thQ mix according to t~e inve~tiD~ is 140 to 160 units, ~vhicl~ is 10 bo 30 units mor~
than tha plas~ic index o~ the raw mix co~tai~ing a mixtura of magne~ium carbonate a~d calcillm sulIate as tb~ m3difging agent. ~ho pres~e Df fr~e CaO i~ th0 mi~ of this inv~ntio~
accou~ts ~or a 5- to 19-percen~ ~ncrease in t~e degree of mi~eral~zation~
~ e clinker prGduced from this mix ~eature~ a high densit~, keeping in mi~d t~at its p~rosit~ amounts ~nl~ t~ 15 to 2~ per-cent~ as well as a~ i~creased strength~ keepi~g in mind :

thab it~ ~ompre~sion strengt~ i~ as ~igh as 450 tD 5OO kg/cm2O
Fi~ally~ tha productio~ o~ ¢li~kex from bhe raw mixaccordi~g to tha inve~tio~ do~s not nec0ssit~te hi~ ~iring temperatures.

5~ Detailed Descripbion o~ the Inventio~

,

2 3 ~ he method D~ prapaxi~g tho raw mix accordi~g to th~
inventi~n is ~uite simple and is carri~d out as follows~
~ ho crus~ing o~ the lime cornpone~t is done in two steps.
First 7 it is passad through a jaw cxus~er and th~n throu~h a hammer ~rush0r~ ~he crushed lime compone~t is then passed throug~ a uni~low drum drier ~o reduce the moistur0 content to 5 parc~nt.
~ he cl~g component and cake are charged into anoth0r drum drier wher0 the moisture co~tent o~ the mixture is brou~ht dDwn to the same level o~ 5 percent. ~he dry material i~
tra~sfarred from the two drum driers to a ball mill where the iron-containing compo~ent~ whic~ needs no prepxocessing, is add0d to ~he mixture~ ~hc r~w mix thus prDduced is placed in corroc~ion silos ~o ensurs a u~i~orm chemical composition of tha mixture" In some cases l;he mix hae to b~ granulated before it is turned into clin~er~ :E or this purpose ~he mix is pas6ed throug~ granulators, ~r a~ample, througb disc-t,ype nodulizers where water is ~ed b~ spr~ iets. - ~
~ betb~r understanding o~ t~e presen~ inventio~l will be ~ad from a consld~ration of the fo'llowing e~amples illusbrati~g pre~erred embodim3~ts thereo~4, }~xample 1 ~ he peroerlta~e by weig~b compositi~ o~ ~he raw mix is a~ ~ollow~:
limestone, 88.3 ' clay~ 9.2 cre dus~ 2~0 ca~e, ~5 ~o prodllca s~ch mi~ t~e lime component is sucG~ssively passed thrDug~ a jaw crusher and a hammer crush3r..
T~e ground lime compon~nt is then dried in a uniflow drum drier to reduca the moisture co~tent to 5 percent~ ~he cla~
compo~nt and cake~ whicb is a b~product o~ t~e ma~nesium and titarlium production, are passad through anoth~r drum dri~r to redu~0 t~e moistur~ GDntent to the sams level o~
5 percent.
Th~ dry material is transferred from bot~ drum~ to a ball mill w~are or~ dust is added. ~he mi~ thu~ produced is kept in corr~cbion ~ilos to e~sure a uniform c)~emical composition, where~fter i~ is passed throug~l a dio-type nodulizer wher0 water i~ ~ed by spray jets. ~he eize of the gra~ules i9 8 to 12 mm.
~h~ ~ropertie~ o~ t~e mix arc as follows:
pla~tioity~ u~its compre~sion s~rengtb o~ g:ranules, ~ k~
~ree ~a~l ~est ~perc3ntage o~
i~ae~ gr~nules after a ~ree fall ~rom a ~ ,ht o~ 1 m)~ 85% ~ .
-~rosity ~ 23~o, The above mix mak~ it possible t~ reduoe the temp0ra~ure .

at w~ic~ the clink0r ~orma~io~ i9 complated ~rom 1,470~C to 1~400Co ~xample 2 '~he p~rcentage by w~ig~t compositio~ o~ t~e raw mix is llo~, limes~o~e~ 83 c lay l pyrite ci~der~p 3 caka 4 ~he mix is prepared as described i~ Example 1~ Tbe proper-tie~ of the mix are as ~ollow~:
plas~icityl 150 u~it~
compr0ssio~ stre~gth o~ granules, 5 kg free ~all ~es~ (perGentags o~ :-intaat granule a~er a :~ree ~all from a h~ighb o~ 90%
~rosit~ . 20%o T~e ~bove mix mak~ po8sible ~ reduc~ t~0 temperature a~ ~hiob tPe clinker ~ormakion is completed ~rom 1~70C ~o ~350C.
Examp~a 3 ~he percentage by w~ig~t aomposition o~ tha raw mix is as followæ:
limesto~e, clay, - 1192 r9--~Z3 oro dust ~ 5 cak~, 6 The mix is prepared as described in Example 10 ~he properties of the m~x are as ~ollow5:
plasticity, 162 units compression strengbh o~ granule~, 9 kg ~rae fall test ~percentage o~
intaot granul~s a~ter a ~ree ~all ~rom a helght cf ~ m)~ 95%
porosity, . 18~o~
Tho above mix makes it possible t~ reduce the temperature at w~ich ~he cli~ker Iormatio~ is ~ompleted ~rom 1,470C ~o 1 ~ 300 C .

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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A raw mix for producing portland cement clinker, compri-sing a lime component, a clay component, an iron-containing component, and a modifying agent which is a cake byproduct of the titanium and magnesium production, the percentage by weight composition of the mix being as follows:
lime component, 88.3 to 77.8 clay component, 9.2 to 11.2 iron-containing component, 2.0 to 5.0 modifying agent, 0.5 to 6.0