CN105800977A - Method for improving early strength of sulfoaluminate clinker - Google Patents
Method for improving early strength of sulfoaluminate clinker Download PDFInfo
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- CN105800977A CN105800977A CN201410845401.7A CN201410845401A CN105800977A CN 105800977 A CN105800977 A CN 105800977A CN 201410845401 A CN201410845401 A CN 201410845401A CN 105800977 A CN105800977 A CN 105800977A
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- sulfoaluminate clinker
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Abstract
The invention discloses a method for improving the early strength of sulfoaluminate clinker. The method comprises the following steps: 1, dosing raw materials: preparing 45-48wt% of limestone, 30-42wt% of bauxite, 8-20wt% of gypsum and 0.2-2wt% of boron salt; 2, grinding the raw materials: grinding a mixture prepared in step 1 until the screen residue of a 80[mu]m square hole sieve is smaller than 14% in order to obtain raw powder; 3, calcining clinker: calcining the raw materials in a routine sulfoaluminate clinker calcining and control mode; and 4, cooling clinker obtained in step 3 to obtain the sulfoaluminate clinker. The method can improve the early strength of the sulfoaluminate clinker.
Description
Technical field
The present invention relates to a kind of sulphate aluminium cement, particularly relate to a kind of method improving sulfoaluminate clinker early strength.
Background technology
Sulfoaluminate clinker is the important component producing sulphate aluminium cement, owing to bauxite resource is the most exhausted, bauxite primary product potential drop is low, and (in Alumina, aluminium dioxide content reduces, dioxide-containing silica increases) cause the sulfoaluminate clinker early strength produced relatively low, cement and the early stage condensation setting rate of cement products that the grog utilizing this early strength relatively low is produced are slack-off, and demoulding strength reduces.The characteristic of sulphate aluminium cement high-early-strength can not get fully demonstrating.Its reason mainly has following 2 points:
1, during producing sulfoaluminate clinker, the mineral in grog are mainly anhydrous calcium sulphoaluminate, dicalcium silicate and calcium aluminoferrite and a small amount of perovskite, free Gypsum Fibrosum etc..Due to raw material Alumina SiO2The increase of content causes grog Minerals C2S content improves, and the most just reduces the content of anhydrous calcium sulphoaluminate (high-early-strength mineral), thus reduces the early strength of sulfoaluminate clinker；
2, in usual sulfoaluminate clinker, the crystal formation of dicalcium silicate mineral is based on β type, and this crystal formation mineral water at normal temperature speed is relatively slow, thus causes sulfoaluminate clinker early strength to reduce.
Summary of the invention
In order to overcome the existing defect reducing the sulfoaluminate clinker early strength reduction caused due to bauxite resource grade, the invention provides a kind of method improving aluminium sulfate early strength, the method changes the crystal formation of dicalcium silicate in sulfoaluminate clinker, thus reach to improve the purpose of sulfoaluminate clinker early strength, and the method is easily controllable and operation.
A kind of method improving sulfoaluminate clinker early strength, it is characterised in that: comprise the technical steps that:
The first step, raw meal proportioning, carry out dispensing by the raw material of following percentage by weight meter:
Limestone: 45-58%；
Bauxite: 30-42%；
Gypsum Fibrosum: 8-20%；
Boron salt: bauxite, limestone and the 0.2-2% of Gypsum Fibrosum gross weight.
Second step, raw grinding, the compound first step prepared carries out grinding, and grinding tails over to 80 μm square hole screens and obtains raw meal powder less than 14%；
3rd step, clinker burning, calcine according to conventional sulfoaluminate clinker calcining and control mode；
4th step, cooling, obtain sulfoaluminate clinker.
In the first step, described boron salt is Borax, boron magnesium ore, bechilite or their compound.
In second step, carry out drying grinding with vertical mill or ball mill.
In second step, raw material pulverizing tails over as 10%-12% to 80 μm square hole screens.
In the third step, calcining uses dry-process rotory kiln or cyclone preheater kiln to calcine.
In the 4th step, cooling uses grate cooler to cool down.
Described sulfoaluminate clinker includes following composition by weight percentage:
Al2O3:22-38%
CaO:38-50%
SiO2:6-15%
SO3: 6-14%
MgO:0-5%
Fe2O3:1-12%
Be2O3:0.05-1%。
The present invention has the advantage that relative to prior art
The present invention is when producing sulfoaluminate clinker, boron salt is added in raw material preparation, boron salt is Borax, boron magnesium ore, bechilite or their compound, introducing by boron salt, the mineral crystal formation of the dicalcium silicate in sulfoaluminate clinker changes over α ＇ type (it is α ＇ type that its reason is that boron element can effectively stablize the crystal formation of dicalcium silicate) in whole or in part from common β type, and the hydration rate that the dicalcium silicate of the crystal formation of α ＇ type is at normal temperatures is comparatively fast, thus reach the purpose of the early strength improving sulfoaluminate clinker.Can the early strength of the existing sulfoaluminate clinker of more significant raising by this method, the sulphate aluminium cement produced and the early stage of cement products condense setting rate and improve, demoulding strength is also improved, and the characteristic of sulphate aluminium cement high-early-strength can more efficiently be embodied again.
Detailed description of the invention
Embodiment 1
The present embodiment comprises the technical steps that:
The first step, raw meal proportioning, carry out being mixed to get compound by the raw material preparing sulfoaluminate clinker, and needed raw material is (by weight percentage):
Bauxite: 34%
Limestone: 54%
Gypsum Fibrosum: 12%；
Boron salt: bauxite, limestone and the 1% of Gypsum Fibrosum gross weight.
Boron salt is that (percentage by weight of the boron oxide contained in boron magnesium ore is about 26% to boron magnesium ore；)
Second step, raw grinding, levigate the tailing over to 0.08mm square hole screen of the compound first step prepared by ball mill is 10%；
3rd step, clinker burning, through 500 tons of NSP rotary kiln calcinings of daily output, calcining heat is about 1380 DEG C, and liter heavily controls to be 0.90 1.0Kg/L, and free calcium oxide controls less than 0.2%.
4th step, cooling, obtain sulfoaluminate clinker.
Limestone in the present embodiment, Alumina, Gypsum Fibrosum main chemical compositions are as follows:
| Raw material | SiO2(%) | Al2O3(%) | Fe2O3(%) | CaO(%) | TiO2(%) | SO3(%) | MgO(%) |
| Bauxite | 17.1 | 52.87 | 12.1 | 0.75 | 1.42 | 1.2 | 0.75 |
| Limestone | 1.28 | 0.53 | 0.14 | 53.99 | 0 | 0.05 | 0.52 |
| Gypsum Fibrosum | 1.38 | 0.92 | 0.21 | 36.45 | 0 | 49.12 | 3.06 |
The present embodiment enters kiln proximate analysis of coal result:
| Wad% | Vad% | Aad% | FC.ad% | Qnet.ad(kcal/kg) |
| 0.98 | 22.1 | 28.43 | 48.74 | 5503 |
After calcining cooling, the chemical composition of grog is:
| SiO2(%) | Al2O3(%) | Fe2O3(%) | CaO(%) | TiO2(%) | SO3(%) | MgO(%) | Be2O3(%) |
| 11.14 | 25.60 | 6.07 | 45.15 | 0.64 | 8.47 | 1.28 | 0.34 |
The physical property assay of grog is as follows:
Do not mix boron magnesium ore grog physical property testing result:
1 day and comprcssive strength intensity raising about the 10MPa of 3 days grogs as can be seen from the table.(sulfoaluminate clinker rupture strength retraction in 28 days is because being not incorporated into the reason of limestone)
Embodiment 2
The present embodiment is consistent with the processing step of embodiment 1, except for the difference that:
Limestone in the present embodiment, Alumina, Gypsum Fibrosum main chemical compositions are as follows
| Raw material | SiO2(%) | Al2O3(%) | Fe2O3(%) | CaO(%) | TiO2(%) | SO3(%) | MgO(%) |
| Bauxite | 23.67 | 53.08 | 4.93 | 0.29 | 2.86 | 1.20 | 0.55 |
| Limestone | 1.75 | 0.53 | 0.14 | 52.73 | 0.00 | 0.05 | 1.38 |
| Gypsum Fibrosum | 1.38 | 0.92 | 0.21 | 36.45 | 0.00 | 49.12 | 3.06 |
Bauxite: 33%；
Limestone: 55.5%；
Gypsum Fibrosum: 11.5%；
Boron salt: bauxite, limestone and the 2% of Gypsum Fibrosum gross weight；
The boron salt added is bechilite, containing Be in bechilite2O3 About 40%；By ball mill, to tail over control to 0.08mm square hole screen be 12% by levigate for raw material.
Enter kiln proximate analysis of coal result
| Wad% | Vad% | Aad% | FC.ad% | Qnet.ad (kcal/kg) |
| 0.71 | 25.95 | 24.21 | 49.13 | 5832.25 |
Through 500 tons of dry method production line calcinings of daily output, sinter leaching temperature about 1400 DEG C, grog chemical composition is as follows:
| SiO2(%) | Al2O3(%) | Fe2O3(%) | CaO(%) | SO3(%) | TiO2(%) | MgO(%) | Be2O3(%) | |
| 13.59 | 25.01 | 2.71 | 46.08 | 1.27 | 8.17 | 1.17 | 1 |
Physical property testing result is as follows:
Do not mix bechilite physical property testing result as follows:
1 day and comprcssive strength intensity raising about the 10MPa of 3 days grogs as can be seen from the table.
Embodiment 3
The present embodiment is consistent with the processing step of embodiment 1, except for the difference that:
Limestone: 45%；
Bauxite: 42%；
Gypsum Fibrosum: 13%；
Boron salt: bauxite, limestone and the 0.2% of Gypsum Fibrosum gross weight.
Boron salt is Borax, containing containing Be in Borax2O3 About 30%；By ball mill, to tail over control to 0.08mm square hole screen be 13% by levigate for raw material.
Through 500 tons of dry method production line calcinings of daily output, sinter leaching temperature about 1400 DEG C, grog chemical composition is as follows:
| SiO2(%) | Al2O3(%) | Fe2O3(%) | CaO(%) | TiO2(%) | SO3(%) | MgO(%) | Be2O3(%) | |
| 12.58 | 26.04 | 8.71 | 42.14 | 1.27 | 8.17 | 1.17 | 0.08 |
The physical property testing result of the grog that the present embodiment prepares is as follows:
Do not add the detection of Borax grog physical property as follows:
1 day and 3 days comprcssive strength improve about 2-3MPa.
Embodiment 4
The present embodiment is consistent with the processing step of embodiment 1, except for the difference that:
Limestone: 58%；
Bauxite: 30%；
Gypsum Fibrosum: 12%；
Boron salt: bauxite, limestone and the 1.5% of Gypsum Fibrosum gross weight.
Boron salt is the mixture (Borax accounts for 40%, and boron magnesium ore accounts for 60%) of Borax and boron magnesium ore, containing Be in Borax2O3 About 30%；The percentage by weight of the boron oxide contained in boron magnesium ore is about 26%, and by ball mill, to tail over control to 0.08mm square hole screen be 13% by levigate for raw material.
Through 500 tons of dry method production line calcinings of daily output, sinter leaching temperature about 1400 DEG C, grog chemical composition is as follows:
| SiO2(%) | Al2O3(%) | Fe2O3(%) | CaO(%) | TiO2(%) | SO3(%) | MgO(%) | Be2O3(%) | |
| 11.34 | 25.25 | 7.13 | 45.15 | 0.64 | 8.47 | 1.28 | 0.59 |
Claims (7)
1. the method improving sulfoaluminate clinker early strength, it is characterised in that: comprise the technical steps that:
The first step, raw meal proportioning, carry out dispensing by the raw material of following percentage by weight meter:
Limestone: 45-58%；
Bauxite: 30-42%；
Gypsum Fibrosum: 8-20%；
Boron salt: bauxite, limestone and the 0.2-2% of Gypsum Fibrosum gross weight；
Second step, raw grinding, the compound first step prepared carries out grinding, and grinding tails over to 80 μm square hole screens and obtains raw meal powder less than 14%；
3rd step, clinker burning, calcine according to conventional sulfoaluminate clinker calcining and control mode；
4th step, cooling, obtain sulfoaluminate clinker.
A kind of method improving sulfoaluminate clinker early strength the most according to claim 1, it is characterised in that: in the first step, described boron salt is Borax, boron magnesium ore, bechilite or their compound.
A kind of method improving sulfoaluminate clinker early strength the most according to claim 1, it is characterised in that: in second step, carry out drying grinding with vertical mill or ball mill.
4. according to a kind of method improving sulfoaluminate clinker early strength described in claim 1 or 3, it is characterised in that: in second step, raw material pulverizing tails over as 10%-12% to 80 μm square hole screens.
A kind of method improving sulfoaluminate clinker early strength the most according to claim 1, it is characterised in that: in the third step, calcining uses dry-process rotory kiln or cyclone preheater kiln to calcine.
A kind of method improving sulfoaluminate clinker early strength the most according to claim 1, it is characterised in that: in the 4th step, cooling uses grate cooler to cool down.
7. according to a kind of method improving sulfoaluminate clinker early strength described in claim 1 or 6, it is characterised in that: described sulfoaluminate clinker includes following composition by weight percentage:
Al2O3:22-38%
CaO:38-50%
SiO2:6-15%
SO3: 6-14%
MgO:0-5%
Fe2O3:1-12%
Be2O3:0.05-1%。
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Cited By (6)
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| CN109369044A (en) * | 2018-11-28 | 2019-02-22 | 中国建筑材料科学研究总院有限公司 | A kind of sulphate aluminium cement and preparation method thereof |
| CN113277759A (en) * | 2021-06-18 | 2021-08-20 | 嘉华特种水泥股份有限公司 | Titanium slag-based solid waste cementing material and preparation method thereof |
| CN113277756A (en) * | 2021-06-28 | 2021-08-20 | 安徽精公检测检验中心有限公司 | Early-strength special cementing material and preparation method thereof |
| CN113307517A (en) * | 2021-06-18 | 2021-08-27 | 登电集团水泥有限公司 | Quick-setting curing material and preparation method thereof |
| CN113816627A (en) * | 2021-09-26 | 2021-12-21 | 江西银杉白水泥股份有限公司 | Ultra-high whiteness white sulphoaluminate cement and preparation method thereof |
| CN114230210A (en) * | 2022-01-05 | 2022-03-25 | 湖南科技大学 | Preparation method and application of calcium sulphoaluminate with core-shell structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109369044A (en) * | 2018-11-28 | 2019-02-22 | 中国建筑材料科学研究总院有限公司 | A kind of sulphate aluminium cement and preparation method thereof |
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| CN113277759A (en) * | 2021-06-18 | 2021-08-20 | 嘉华特种水泥股份有限公司 | Titanium slag-based solid waste cementing material and preparation method thereof |
| CN113307517A (en) * | 2021-06-18 | 2021-08-27 | 登电集团水泥有限公司 | Quick-setting curing material and preparation method thereof |
| CN113277759B (en) * | 2021-06-18 | 2022-09-23 | 嘉华特种水泥股份有限公司 | Titanium slag-based solid waste cementing material and preparation method thereof |
| CN113277756A (en) * | 2021-06-28 | 2021-08-20 | 安徽精公检测检验中心有限公司 | Early-strength special cementing material and preparation method thereof |
| CN113816627A (en) * | 2021-09-26 | 2021-12-21 | 江西银杉白水泥股份有限公司 | Ultra-high whiteness white sulphoaluminate cement and preparation method thereof |
| CN114230210A (en) * | 2022-01-05 | 2022-03-25 | 湖南科技大学 | Preparation method and application of calcium sulphoaluminate with core-shell structure |
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