CN1063408C

CN1063408C - Normal silicate cement raw material and clinker without containing iron raw material

Info

Publication number: CN1063408C
Application number: CN96117486A
Authority: CN
Inventors: 李述良; 孔宪阳; 杨朝水
Original assignee: Guyu Building Materials Co Ltd Longchang County Sichuan Prov
Current assignee: Guyu Building Materials Co Ltd Longchang County Sichuan Prov
Priority date: 1996-03-16
Filing date: 1996-03-16
Publication date: 2001-03-21
Anticipated expiration: 2016-03-16
Also published as: CN1138560A

Abstract

The present invention provides a raw material of Portland cement without mixing an iron raw material in a raw material ingredient and the clinker thereof. The raw material is only composed of limestone, a clayey raw material, anthracite coal and seed crystal and comprises 1.4 to 2.1 wt% of Fe2O3. The clinker comprises 2.0 to 3.5 wt% of Fe2O3, and the grade of the clinker can reach more than 60MPas. The present invention integrates the advantages of simple process, high machine-hour yield, low calcination heat consumption, low cost and good cement quality. Compared with traditional cement calcined from a raw material mixed with iron, the present invention has the advantages that the machine-hour yield is raised by 16%, calcination coal is reduced by 20%, cement cost is reduced by 10 yuan to 20 yuan, and the early strength and the later strength of the cement reach and exceed national standards.

Description

A kind of Portland clinker and preparation method thereof

The present invention relates to low Portland clinker of a kind of iron level and preparation method thereof

Till the present, major part manufacture of cement producer all adopts the method for adding crystal seed to come calcine cement, its principle is to quicken the formation of crystal mineral by the crystalline inducing action, thereby promote the formation of grog, " Chinese technological achievement complete works " (in August, 1992 publication) discloses a kind of interpolation crystal seed cement kiln calcining technology for the 203rd page, adopt high iron formula to compare to when it thinks calcine cement and adopt low iron formula for the system of adding crystal seed, to adapt to more, therefore, most interpolation crystal seeds that adopt come the producer of calcine cement all to use high iron formula, promptly add ferriferous raw material in cement slurry; Patent Office of the People's Republic of China discloses a kind of technology of adding the crystal seed cement kiln calcining efficacy with publication number CN1064643A, it still adopts the high ferro formula material and adds crystal seed and calcine ordinary Portland cement, through testing and studies have shown that, in cement slurry, adopt high iron formula to calcine ordinary Portland cement and have following inevitable shortcoming:

One, owing to added ferriferous raw material, make proportioning process complicated;

Two, because the ferriferous raw material moisture content that adds is overweight, an irony material grindability is poor, and difficult the mill adds the admixture of crystal seed, and raw material output does not improve, and behind the deduction crystal seed, the raw material platform produces also slightly decline; Simultaneously, for the cement grinding mill operation, kiln discharge grog grindability difference not only influences unit-hour output, and influences the fineness of mill cement, thereby influences the quality of grog;

Three, when shaft kiln calcination, because the effect of composite mineralizer liquid phase is occurred in advance, and amount of liquid phase is big, this just makes the speed of getting angry of shaft kiln be affected, and adds the geneogenous cross section uneven disadvantage of ventilating that exists of shaft kiln, gets angry that it is serious to locate also thick atmosphere slowly, Fe ₂O ₃Be reduced into FeO, metallic iron generates the reduction bulk even, often causes kiln bottom scaffold, makes discharging not smooth, influences the shaft kiln unit-hour output; Simultaneously, when many and kiln temperature was higher in amount of liquid phase, the ring formation phenomenon was serious in the kiln, when adopting dark flameless calcination, degree of depth ring formation takes place easily, thereby cause taking out in the kiln heart, and the shaft kiln clinkering zone elongates, the cooling zone shortening, and grog can not chilling, β-C in the time of 675 ℃ ₂S changes into γ-C ₂S, C ₃S further decomposes, thereby influences the visual appearance and the intensity of kiln discharge grog, and FCaO content is big, has a strong impact on soundness;

Four, owing to added ferriferous raw material, make the loss of the inadequacy burning for chemistry mechanics reason height of grog, burn till hear rate and increase on the contrary.

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and provide a kind of iron level low, the unit-hour output height, burn till that hear rate is low, cost is low and preparation method that the measured Portland clinker of matter and proportioning process thereof are simplified.

The object of the present invention is achieved like this:

The Portland clinker that a kind of iron level is low is prepared as follows:

(A) composition preparation raw material as following weight percent:

Wingdale 70-85%

Clayey raw material 0-12%

Hard coal 9-13%

Crystal seed 1-7%

Wherein said clayey raw material is shale or coal gangue.

(B) raw material combined grinding to 0.080mm square hole sieve described in (A) is tailed over be no more than 10% raw material powder, the raw material powder is gone in the pan-pelletizer after stirring, the water balling-up that adds 10-15%, wherein the pellet granularity is 3-15mm, pellet intensity is gone into pellet the kiln calcining then greater than 500g/, and the klining temperature is controlled at 50 ℃ of 1400 scholars, in the stagnant required residence time of height is 20 minutes, promptly gets Portland clinker behind the cooling pellet.

This Portland clinker contains the mineral composition of following weight percent:

C ₃S 42～60％

C ₂S 12～30％

C ₃A 8～13％

C ₄AF 7～12％

C ₄A ₃S 0～4％

In addition, this cement contains the Chemical Composition of following weight percent in ripe:

LOSS 0～1.0％

CaO 62～66％

SiO ₂ 18～22％

Al ₂O ₃ 5～6.5％

Fe ₂O ₃ 2.0～3.5％

SO ₃ 1.0～2.0％

MgO 2～3％

Table 1: this cement clinker with mix iron cement clinker strength contrast table

Above-mentioned cement clinker is mixed mixing material and the levigate ordinary Portland cement that promptly makes of gypsum by a certain percentage, and every performance technologies index of cement sees Table 2 with every performance technologies index contrast of the cement that adopts the interpolation ferriferous raw material to make.

Table 2: the physicals contrast table of the cement of this cement and admixture ferriferous raw material

From table 1,2 as can be seen the ordinary Portland cement that grinds of this cement clinker than adopting admixture ferriferous raw material incinerating cement on resistance to compression, folding strength, all to be better than the latter.

Simultaneously, adopt do not mix ferriferous raw material than admixture ferriferous raw material come the machine shaft kiln platform of calcine cement produce higher, coal consumption is lower, specifically contrast as following table 3,4.

Table 3: machine shaft kiln platform produces contrast table

Table 4: coal consumption contrast table

The present invention also has following advantage than prior art:

One, because in cement raw mix proportioning, mixes ferriferous raw material outside the subduction, so simplified charge calculation technology, make attrition resistant irony composition minimizing in the mill feed material simultaneously, improved the mill feed material grindability, quickened the grinding speed of mill feed material, improved and to grind the raw material fineness;

Two, owing to go into Fe in the kiln raw material ₂O ₃Content reduces, and P leads raising in the raw material, and the high alumina situation appears in raw material, can form solid bottom fire layer in shaft kiln calcination, and firing range expansion helps stablizing the fire in a stove before fuel is added and material burns till, and has guaranteed the big air quantity of shaft kiln, high blast operation;

Three, owing to go into Fe in the kiln raw material ₂O ₃Content reduces, and amount of liquid phase reduces in the kiln, and reducing atmosphere reduces in the kiln, has the reduction bulk hardly, thereby has thoroughly solved the long-term bottom scaffold phenomenon that occurs of machine shaft kiln;

Four, owing to Fe in the raw material ₂O ₃Content reduces, and burnability of raw material greatly improves, and the inducing action of crystal seed obviously improves, and the kiln face is got angry and speeded up, kiln ventilation is obviously improved, and clinkering zone shortens, and cooling zone elongates, help the grog chilling, make grog cross its decomposition temperature scope rapidly, prevented C ₃S decomposes, and has prevented β-C ₂S changes into γ-C ₂S has reduced the grog efflorescence, thereby has guaranteed the kiln discharge clinker quality;

Five, because obtaining chilling, grog makes irony crystal minimizing in increase of grog internal stress and the grog, kiln discharge grog dead roasting bulk reduces, and has increased the grindability of kiln discharge grog, provides prerequisite for cement grinding mill improves unit-hour output, cement grinding mill output is greatly improved, realized that F.F. goes out soon;

Six, because burnability of raw material is improved, make grog burn till heat dissipation reduction and required thermal zone residence time shortening, use coal, improved the shaft kiln unit-hour output thereby reduced to burn till.

Embodiment:

Example 1: Wingdale 80% by weight percentage, coal gangue 4.7%, crystal seed 4.6%, hard coal 10.7% is prepared burden, combined grinding to 0.080mm square hole sieve tails over and is no more than 10% raw material powder, the raw material powder is gone in the pan-pelletizer after stirring, the water balling-up of adding 10～15%, in the strict control of the pellet granularity 3-15mm scope, pellet intensity is gone into the kiln calcining then greater than 500g/, the klining temperature is controlled at 1400 ± 50 ℃, in the stagnant required residence time of height is 20 minutes, and cooling promptly gets cement clinker, and its mineral composition is C ₃S, C ₂S, C ₃A, C ₄AF and a small amount of C ₃A ₃S, mix according to a certain percentage then mixing material and gypsum levigate to fineness be 0.08mm square hole sieve＜10%, make ordinary Portland cement.Wherein the Chemical Composition of cement slurry sees Table 5, and the Chemical Composition of cement clinker sees Table 6, and the physicals of cement sees Table 7.

Example 2, Wingdale 72% by weight percentage, shale 11.2%, crystal seed 6.6%, hard coal 10.2% is prepared burden, and presses the method calcine cement in the foregoing description 1, makes ordinary Portland cement.Wherein the chemical ingredients of cement slurry sees Table 5, and the Chemical Composition of cement clinker sees Table 6, and the physicals of cement sees Table 7.

Example 3, Wingdale 85% by weight percentage, coal gangue 3.6%, crystal seed 2.1%, hard coal 9.3% is prepared burden, and presses the method calcine cement in the foregoing description 1, makes ordinary Portland cement.Wherein the Chemical Composition of cement slurry sees Table 5, and the Chemical Composition of cement clinker sees Table 6, and the physicals of cement sees Table 7.

The chemical ingredients of table 5 cement slurry

The chemical ingredients of table 6 cement clinker

The physicals of table 7 cement

Time of coagulation		Intensity				Stability
Time of coagulation		Intensity				Stability	Initial set	Final set	Anti-folding		Resistance to compression	Boiling, it is qualified to boil
3 days	28 days	3 days	28 days						Anti-folding		Resistance to compression
3 days	28 days	3 days	28 days	2:55	3:30	4.7			7.7	26.4	55.7

The mineralogical composition that contains following weight percent in this cement clinker:

C ₃S 55％、C ₄AF 11％、C ₂S 25％、C ₃A 6％、C ₃A ₃S 3％。

The ordinary Portland cement that utilizes the present invention to make is compared with traditional admixture ferriferous raw material incinerating cement, and the shaft kiln unit-hour output can improve 16%, burns till with coal to descend more than 20%, and the ton cement cost can reduce 10-20 unit.

Claims

1, a kind of Portland clinker is characterized in that containing the mineral composition of following weight percent:

C ₃S 42-60％

C ₄AF 7-12％

C ₂S 12-30％

C ₄A ₃S 0-4％

C ₃A 8-13％

2, the preparation method of the described Portland clinker of claim 1 is characterized in that carrying out as follows:

(A) composition preparation raw material as following weight percent:

Wingdale 70-85%

Clayey raw material 0-12%

Hard coal 9-13%

Crystal seed 1-7%

(B) raw material combined grinding to 0.080mm square hole sieve described in (A) is tailed over be no more than 10% raw material powder, the raw material powder is gone in the pan-pelletizer after stirring, the water balling-up that adds 10-15%, wherein the pellet granularity is 3-15mm, pellet intensity is gone into pellet the kiln calcining then greater than 500g/, and the klining temperature is controlled at 1400 ± 50 ℃, in the stagnant required residence time of height is 20 minutes, promptly gets cement clinker behind the cooling pellet.

3, the preparation method of silicate cement according to claim 2 is characterized in that described raw clay is shale or coal gangue.