CN1058688C - Additive for cement and preparation process therefor - Google Patents
Additive for cement and preparation process therefor Download PDFInfo
- Publication number
- CN1058688C CN1058688C CN97120171A CN97120171A CN1058688C CN 1058688 C CN1058688 C CN 1058688C CN 97120171 A CN97120171 A CN 97120171A CN 97120171 A CN97120171 A CN 97120171A CN 1058688 C CN1058688 C CN 1058688C
- Authority
- CN
- China
- Prior art keywords
- additive
- sulfuric acid
- fluorite
- cement
- gypsum
- 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.)
- Expired - Fee Related
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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
- C04B7/421—Inorganic materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a compound additive added before cement raw materials are calcined. The compound additive is prepared from fluorite, gypsum, expanding material and sulfuric acid. The compound additive is added before the raw material is calcined, which can reduce activation energy and calcination temperature, shorten calcination time, guarantee cement quality, increase 20 % to 30% of clinker yield, and save 20% to 30% of fuel.
Description
The invention belongs to the technology of producing cement field, more particularly, the present invention relates to a kind of composite additive that adds before the cement slurry calcining and preparation method thereof.
Cement is one of of paramount importance material in the construction work, be widely used in industry, agricultural, national defence, but manufacture of cement is again the industry of a highly energy-consuming, therefore how cutting down the consumption of energy then is one of improved important content of technology of producing cement (volume such as Cui Enxuan, " chemical technology ", Higher Education Publishing House, in October, 1993,190 pages).In order to cut down the consumption of energy, improve the quality of products, since the sixties, people successively develop and comprise mineralizer (CN1096997A), fluorine one sulphur composite mineralizer (CN1098076A) and the Fe of cement mineralizing agent as being made up of gypsum and fluorite
2O
3Or/and CaF
2Fusing assistant (WO94/14719), the additive of using at interior multiple preparation cement clinker, they can reduce temperature of reaction in the raw material calcination process, improve firing condition, raw material are from sintering contraction outside to inside, be lividity, melt unit weight is bigger, but finds in actual applications after some mineralizers add pellet inside fully to be grilled thoroughly, free cao is higher, influence quality product, and still need to use fat coal to make fuel, coal consumption does not have remarkable decline yet.
The objective of the invention is to overcome the shortcoming that above-mentioned additive exists, propose composite additive that a kind of a kind of calcination of cement clinker that cuts down the consumption of energy, improves the quality of products uses and preparation method thereof.
Realize purpose major technique content of the present invention: propose a kind of composite additive of forming by gypsum, fluorite, expanding material and sulfuric acid.
Each composition weight percentage composition of composite additive of the present invention (is 100 in each composition weight sum):
Fluorite 10-30%, gypsum 20-40%, expanding material 40-60%, sulfuric acid 10-15%.
Described fluorite (fluorite) is crystalloid or caked mineral, and Chemical Composition mainly is CaF
2, the CaF of various places fluorite
2Content is different.It can be used as fusing assistant.Fluorite CaF of the present invention
2More than 60%, be the ore that Tangshan Area is produced.
Described gypsum requires grade more than 40%.
Described expanding material comprises perlite, vermiculite or its mixture, preferably vermiculite (vermiculite).
Described sulfuric acid is that concentration is 30% sulfuric acid, is a kind of strong oxidizer in the prescription.
The preparation process of composite additive of the present invention may further comprise the steps:
1, the solid mineral of gypsum, fluorite, expanding material being crushed to particle with pulverizer respectively is that thorough mixing is even again below the 10mm;
2, the solid materials that mixes being finely ground to particle at crusher reaches below the 0.08mm;
3, in (2) material in step, add sulfuric acid, fully mix, obtain the finished product of water content＜15%, then pack.
Above-mentioned steps (2) can be saved, directly with cement slurry be ground to the desired fineness of cement promptly the percentage that tails over of 80 μ m square hole sieves be no more than 10%.
The composite additive that makes by the inventive method can be used for the burning clinker of cement of any kiln type, and add-on is that the 1-1.5% of cement slurry is the most economical, and add-on is many more, and effect is good more, but cost is too high.
Main effect of the present invention: owing to adopt additive of the present invention, make and reduce firing temperature in the raw material calcination process significantly, therefore can improve grog output reaches 20-30%; Because add expanding material in the composite additive, thereby make a lot of micropores of the inner generation of pellet, to reach " synchronously " burning, grog burns thoroughly, guarantees the quality of grog; Adopt additive of the present invention, meal reduces, uniform particles, so kiln ventilation is good, interior machine power consumption reduces, and also helps environment protection; The present invention adopts the sulfuric acid strong oxidizer, can increase the calorific value content of raw material per ton, and oxidizing reaction speeds up, and firing time is shortened, and not only improves product production, guarantees that grog burns thoroughly, the more important thing is the 20-30% that can economize on coal; Adopt composite additive of the present invention, the calcining raw material can be used low grade coal.
Further specify characteristics of the present invention with example below:
Example 1-4
Used fluorite, vermiculite, the perlite ore of example is that Tangshan Area is produced the CaF of fluorite
2Content 60%, it is formed content and sees Table 1, and mixture is crushed to≤meal of 0.08mm.
Example 5
This example is result of use experiment of the present invention, experiment is that plump county carries out in the Yan Feng cement mill in Hebei province, cement slurry 6000kg, the composite additive 60kg that adds example 1 at the scene, mix, calcine in shaft kiln, calcination condition is identical with shaft kiln tradition burning method, bunker coal is an anthracite, and cement slurry comprises Wingdale, clay, iron powder.In same kiln, use with a kind of fuel, under the identical operations condition raw material that add additive of the present invention are calcined and with do not add additive of the present invention and compare.Consequently: adding the used anthracite of cement clinker that additive of the present invention makes is 9% of raw material, and joining heat is 800 kcal/kg grogs, and 3 days intensity of its grog is 38Mpa, reaches 62.6Mpa in 28 days, and output can improve 30%; It is 14% that anthracite is used in not doping, join heat and reach 1200 kcal/kg grogs, and sticking kiln.
Table 1:
| Component, the kg example | Fluorite | Gypsum | Expanding material | 30% sulfuric acid | ||
| Vermiculite | Nacrite | Vermiculite mixes with perlite at 1: 1 | ||||
| 1 | 15 | 35 | 40 | 10 | ||
| 2 | 20 | 30 | 40 | 10 | ||
| 3 | 10 | 20 | 55 | 15 | ||
| 4 | 10 | 30 | 50 | 10 | ||
Claims (6)
1. a kind of composite additive that adds before a cement slurry is calcined is characterized in that each composition weight percentage composition is:
Fluorite 10-30%, gypsum 20-40%, expanding material 40-60%, sulfuric acid 10-15%, described expanding material comprise vermiculite, perlite or its mixture.
2. according to the described additive of claim 1, it is characterized in that described fluorite CaF
2Content is more than 60%.
3. according to the described additive of claim 1, it is characterized in that described grade of gypsum is more than 40%.
4. according to the described additive of claim 1, it is characterized in that described sulfuric acid is that concentration is 30% sulfuric acid.
5. the preparation method of the described additive of claim 1 is characterized in that preparation process comprises:
(1) solid materials of gypsum, fluorite, expanding material being crushed to particle fineness with pulverizer respectively is below the 10mm, it to be mixed again;
(2) material that mixes being finely ground to particle fineness at crusher reaches below the 0.08mm;
(3) adding concentration in the material of step (2) is 30% sulfuric acid, fully mixes, then pack.
6. the described Application of Additives of claim 1 is characterized in that the preceding composite additive that adds the 1-1.5% of raw material weight of cement slurry calcining, calcines behind the thorough mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97120171A CN1058688C (en) | 1997-11-18 | 1997-11-18 | Additive for cement and preparation process therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97120171A CN1058688C (en) | 1997-11-18 | 1997-11-18 | Additive for cement and preparation process therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1217303A CN1217303A (en) | 1999-05-26 |
| CN1058688C true CN1058688C (en) | 2000-11-22 |
Family
ID=5175799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97120171A Expired - Fee Related CN1058688C (en) | 1997-11-18 | 1997-11-18 | Additive for cement and preparation process therefor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058688C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101838115B (en) * | 2010-03-19 | 2012-09-12 | 中科创投(北京)科技有限公司 | Novel special mineralizing agent for dry-process cement clinker production and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104306A (en) * | 1986-06-14 | 1987-12-23 | 四川建筑材料工业学院 | With zinc oxide Calcium Fluoride (Fluorspan) and calcium chloride is main mineralizer easy fired silicate cement |
| CN1047848A (en) * | 1989-06-08 | 1990-12-19 | 中国建筑材料科学研究院水泥科学研究所 | A kind of process for raw cement pretreatment |
| CN1092390A (en) * | 1993-12-28 | 1994-09-21 | 浙江大学 | Make the cement production process of cement slurry raw material and blended material with aluminium sulfate slag |
-
1997
- 1997-11-18 CN CN97120171A patent/CN1058688C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104306A (en) * | 1986-06-14 | 1987-12-23 | 四川建筑材料工业学院 | With zinc oxide Calcium Fluoride (Fluorspan) and calcium chloride is main mineralizer easy fired silicate cement |
| CN1047848A (en) * | 1989-06-08 | 1990-12-19 | 中国建筑材料科学研究院水泥科学研究所 | A kind of process for raw cement pretreatment |
| CN1092390A (en) * | 1993-12-28 | 1994-09-21 | 浙江大学 | Make the cement production process of cement slurry raw material and blended material with aluminium sulfate slag |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1217303A (en) | 1999-05-26 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |