CN105366966A - High-magnesium micro-expansion cement and preparation method thereof - Google Patents
High-magnesium micro-expansion cement and preparation method thereof Download PDFInfo
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- CN105366966A CN105366966A CN201510828952.7A CN201510828952A CN105366966A CN 105366966 A CN105366966 A CN 105366966A CN 201510828952 A CN201510828952 A CN 201510828952A CN 105366966 A CN105366966 A CN 105366966A
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Abstract
The invention relates to high-magnesium micro-expansion cement and a preparation method thereof. The high-magnesium micro-expansion cement comprises a cement clinker and gypsum, and the content of magnesium oxide in the cement clinker is 3.5%-5.0%. The preparation method of the cement comprises the steps: jointly grinding to obtain a cement raw material; calcining the cement raw material for 30 min-90 min at the kiln speed of 3.6 r/min-4.5 r/min and at the temperature of 1350-1500 DEG C; cooling the clinker, wherein the cooling speed of the clinker reaches 150 DEG C/min-250 DEG C/min; and jointly grinding the high-magnesium cement clinker after cooling and the gypsum until the fineness is 0.08 mm and the content of sieving residues is 5.0%-12.0%, and thus obtaining the high-magnesium cement. The size of periclase in the high-magnesium micro-expansion cement clinker is 2 [mu]m to 15 [mu]m; the 28 d-180 d expansion rate of the high-magnesium cement is as low as 0.038%-0.063%, and the 28 d-80 d expansion increase can be regulated in the range of 0.005%-0.020%.
Description
Technical field
The present invention relates to a kind of cement, particularly relate to a kind of high magnesium micro-expansion cement and preparation method thereof.
Background technology
Research finds, the periclasite hydration through high-temperature calcination is very slow, and the volumetric expansion caused in generation magnesium hydroxide process occurs slower.In cement clinker, MgO exists with solid solution and free two kinds of forms.Wherein solid solution state MgO is without expansion, and the MgO (also claiming periclasite) existed with free crystal habit, in slow hydration process, own vol can expand about 117%, has later stage micro-expansibility.In cement the size of periclasite micro-expansibility and action time and its content and size closely related.In cement, content of MgO is too low, exists, do not have microdilatancy effect mainly with solution; Content of MgO is too high, easily causes soundness bad.Periclasite is undersized, and the expansion time is too early; Periclasite is oversize, and microdilatancy is excessively slow for action time, is unfavorable for that the temperature drop compensating mass concrete shrinks.
" Moderate-heat silicate cement clinker and production method thereof " that prior art proposes, its clinker discharging enters comb formula refrigerant chilling, temperature is made to be cooled to 150 DEG C from 1100 DEG C, speed of cooling is too fast is unfavorable for growing up of periclasite crystal, thus causes periclasite expansion in moderate heat cement to occur too early.Meanwhile, the preparation method of this cement does not describe in detail the factor that the high magnesium moderate heat cement swelling property of impact such as raw material grinding fineness, Cement clinker buring temperature, soaking time play.
Summary of the invention
Main purpose of the present invention is, provides a kind of high magnesium micro-expansion cement and preparation method thereof, and technical problem to be solved solves high-magnesia cement swelling property size and the free difficult problem in the length of time that expands in the market, thus be more suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.The high magnesium micro-expansion cement proposed according to the present invention comprises cement clinker and gypsum, in described cement clinker, magnesian content is: 3.5%-5.0%, in cement clinker, periclasite is of a size of 2 μm ~ 15 μm, the rate of expansion of 28 days ~ 180 days is that the expansion of 0.038% ~ 0.063%, 28 days ~ 180 days is promoted to regulate and control in 0.005% ~ 0.020% scope.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Preferably, aforesaid high magnesium micro-expansion cement, wherein said cement clinker is formed by the grinding of cement slurry and calcining, the mass percentage meter of described cement slurry, comprise: calcareous raw material: 71.08%-75.82%, siliceous raw material: 9.54%-9.65%, magnesia raw material: 6.06%-11.41%, aluminum raw material: 5.51%-5.91%, copper raw material: 2.42%-2.56%.
Preferably, aforesaid calcareous raw material is Wingdale, and described siliceous raw material is silica, and described magnesia raw material is high magnesium lime stone, and described aluminum raw material is aluminium mine tailing stone, and described copper raw material is copper tailing.
The object of the invention to solve the technical problems also adopts following technical scheme to realize.The preparation method of the high magnesium micro-expansion cement proposed according to the present invention comprises:
1) raw material is taken, jointly carry out grinding and obtain cement slurry, the component of described raw material is (mass percentage): calcareous raw material: 71.08%-75.82%, siliceous raw material: 9.54%-9.65%, magnesia raw material: 6.06%-11.41%, aluminum raw material: 5.51%-5.91%, copper raw material: 2.42%-2.56%;
2) by cement slurry kiln speed 3.6r/min ~ 4.5r/min, 1350 DEG C ~ 1500 DEG C calcining 30min ~ 90min;
3) to clinker cooling, grog rate of temperature fall reaches 150 DEG C/min ~ 250 DEG C/min;
4) by cooled cement clinker and gypsum intergrinding to being that 0.08mm tails over 5.0% ~ 12.0% to fineness, obtain high magnesium micro-expansion cement;
Wherein, in cement clinker, periclasite is of a size of 2 μm ~ 15 μm.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Preferably, aforesaid step 1) in raw grinding to tail over to fineness 0.08mm be 5.0% ~ 12.0%.
Preferably, aforesaid step 2) in calcining temperature be 1400 DEG C ~ 1450 DEG C, calcination time is 30min ~ 60min.
Preferably, aforesaid step 2) in kiln speed 3.7r/min ~ 4.0r/min.
Preferably, aforesaid step 3) in grog rate of temperature fall reach 180 DEG C/min ~ 250 DEG C/min.
By technique scheme, height magnesium micro-expansion cement of the present invention and preparation method thereof at least has following advantages:
(1) high magnesium micro-expansion cement of the present invention and preparation method thereof is used, the high-magnesia cement rate of expansion of 28 days ~ 180 days of preparation is low to moderate 0.038% ~ 0.063%, the expansion of 28 days ~ 180 days is promoted to regulate and control in 0.005% ~ 0.020% scope, solves the problem of cement and expanded performance regulation and control.
(2) starting material of the present invention are easy to get, and preparation technology is simple, and cost is low, and economic results in society are remarkable.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technique means of the present invention, and can be implemented according to the content of specification sheets, be described in detail as follows below with preferred embodiment of the present invention.
Embodiment
For further setting forth the present invention for the technique means reaching predetermined goal of the invention and take and effect, below in conjunction with preferred embodiment, to the high magnesium micro-expansion cement proposed according to the present invention and preparation method thereof its embodiment, feature and effect thereof, be described in detail as follows.In the following description, the not necessarily same embodiment that different " embodiment " or " embodiment " refers to.In addition, the special characteristic in one or more embodiment, feature can be combined by any suitable form.
A kind of high magnesium micro-expansion cement of the present invention comprises cement clinker and gypsum, in described cement clinker, magnesian content is: 3.5%-5.0%, in cement clinker, periclasite is of a size of 2 μm ~ 15 μm, the rate of expansion of 28 days ~ 180 days is that the expansion of 0.038% ~ 0.063%, 28 days ~ 180 days is promoted to regulate and control in 0.005% ~ 0.020% scope.Described cement clinker is formed by the grinding of cement slurry and calcining, and the mass percentage meter of described cement slurry, comprising: calcareous raw material: 71.08%-75.82%, is Wingdale; Siliceous raw material: 9.54%-9.65% is silica; Magnesia raw material: 6.06%-11.41% is high magnesium lime stone; Aluminum raw material: 5.51%-5.91%, aluminium mine tailing stone; Copper raw material: 2.42%-2.56% is copper tailing.
In above-mentioned example, each material chemical component of described cement slurry is as shown in table 1:
The chemical composition (mass percentage %) of each raw material of table 1
| Raw material | Loss | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | ∑ |
| Wingdale | 39.93 | 4.60 | 0.43 | 0.38 | 52.20 | 1.29 | 99.83 |
| Silica | 2.14 | 87.91 | 5.8 | 1.95 | 0.18 | 0.53 | 98.51 |
| High magnesium lime stone | 43.40 | 2.93 | 0.22 | 0.35 | 30.93 | 19.50 | 97.33 |
| Aluminium mine tailing stone | 11.66 | 31.40 | 27.32 | 24.51 | 0.40 | 0.61 | 95.90 |
| Copper tailing | -4.67 | 36 | 5.21 | 50.91 | 8.49 | 2.95 | 98.89 |
" Loss " represents loss on ignition;
" ∑ " represents the summation of several, prostatitis chemical composition, and the surplus less than 100% is other impurity in a small amount of alkaline matter or raw material.
According to above-described embodiment, the present invention proposes following high magnesium micro-expansion cement example 1-8, and the raw material composition of its cement slurry is as shown in table 2.
Raw material composition (mass percentage) of table 2 example 1-8 cement slurry
According to above-described embodiment, the present invention the preparation technology parameter of following high magnesium micro-expansion cement example 1-8 is proposed and content of magnesia as shown in table 3.
The preparation technology parameter of table 3 high magnesium micro-expansion cement example 1-8 cement clinker and content of magnesia
Embodiments of the invention also propose a kind of preparation method of high magnesium micro-expansion cement, comprise following steps:
1) take calcareous raw material, siliceous raw material, magnesia raw material, aluminum raw material, copper raw material, jointly carry out grinding and obtain cement slurry, concrete, in each embodiment, the raw material of cement slurry is as shown in table 1, and the selection of each cement slurry raw material is as shown in table 2:
2) by cement slurry kiln speed 3.6r/min ~ 4.5r/min, 1350 DEG C ~ 1500 DEG C calcining 30min ~ 90min.
3) to clinker cooling, grog rate of temperature fall reaches 150 DEG C/min ~ 250 DEG C/min;
4) by cooled high-magnesia cement grog and gypsum intergrinding to being that 0.08mm tails over 5.0% ~ 12.0% to fineness, obtain high-magnesia cement.
By aforementioned preparation process, the important parameter in each embodiment is as shown in table 3
The high-magnesia cement prepared according to the requirement embodiment 1-8 of JC/T313-2009 " expansive cement swelling rate test method " carries out cement and expanded performance test.Result is as shown in table 4.
The expansion performance experiment result of table 4 high-magnesia cement
Experiment proves, use high magnesium micro-expansion cement of the present invention and preparation method thereof, the high-magnesia cement rate of expansion of 28 days ~ 180 days is: 0.038% ~ 0.063%, and the high-magnesia cement expansion of 28 days ~ 180 days is promoted to regulate and control in 0.005% ~ 0.020% scope.
The above, it is only preferred embodiment of the present invention, not do any pro forma restriction to the present invention, any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (8)
1. one kind high magnesium micro-expansion cement, it is characterized in that: it comprises cement clinker and gypsum, in described cement clinker, magnesian content is: 3.5%-5.0%, in cement clinker, periclasite is of a size of 2 μm ~ 15 μm, the rate of expansion of 28 days ~ 180 days is that the expansion of 0.038% ~ 0.063%, 28 days ~ 180 days is promoted to regulate and control in 0.005% ~ 0.020% scope.
2. high magnesium micro-expansion cement according to claim 1, it is characterized in that, described cement clinker is formed by the grinding of cement slurry and calcining, the mass percentage meter of described cement slurry, comprise: calcareous raw material: 71.08%-75.82%, siliceous raw material: 9.54%-9.65%, magnesia raw material: 6.06%-11.41%, aluminum raw material: 5.51%-5.91%, copper raw material: 2.42%-2.56%.
3. high magnesium micro-expansion cement according to claim 1, is characterized in that, described calcareous raw material is Wingdale, described siliceous raw material is silica, described magnesia raw material is high magnesium lime stone, and described aluminum raw material is aluminium mine tailing stone, and described copper raw material is copper tailing.
4. a preparation method for high magnesium micro-expansion cement, is characterized in that: comprise the following steps:
1) raw material is taken, jointly carry out grinding and obtain cement slurry, the component of described raw material is (mass percentage): calcareous raw material: 71.08%-75.82%, siliceous raw material: 9.54%-9.65%, magnesia raw material: 6.06%-11.41%, aluminum raw material: 5.51%-5.91%, copper raw material: 2.42%-2.56%;
2) by cement slurry kiln speed 3.6r/min ~ 4.5r/min, 1350 DEG C ~ 1500 DEG C calcining 30min ~ 90min;
3) to clinker cooling, grog rate of temperature fall reaches 150 DEG C/min ~ 250 DEG C/min;
4) by cooled cement clinker and gypsum intergrinding to being that 0.08mm tails over 5.0% ~ 12.0% to fineness, obtain high magnesium micro-expansion cement;
Wherein, in cement clinker, periclasite is of a size of 2 μm ~ 15 μm.
5. the preparation method of high magnesium micro-expansion cement according to claim 4, is characterized in that, step 1) in raw grinding to tail over to fineness 0.08mm be 5.0% ~ 12.0%.
6. the preparation method of high magnesium micro-expansion cement according to claim 4, is characterized in that, step 2) in calcining temperature be 1400 DEG C ~ 1450 DEG C, calcination time is 30min ~ 60min.
7. the preparation method of high magnesium micro-expansion cement according to claim 4, is characterized in that, step 2) in kiln speed 3.7r/min ~ 4.0r/min.
8. the preparation method of high magnesium micro-expansion cement according to claim 4, is characterized in that, step 3) in grog rate of temperature fall reach 180 DEG C/min ~ 250 DEG C/min.
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| CN113060950A (en) * | 2021-04-09 | 2021-07-02 | 嘉华特种水泥股份有限公司 | Anti-cracking self-repairing cement |
| CN113443845A (en) * | 2021-06-28 | 2021-09-28 | 中国建筑材料科学研究总院有限公司 | Method for quantitatively regulating content of periclase in cement |
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