CN108046621A - A kind of preparation method of calcined dolomite powder - Google Patents
A kind of preparation method of calcined dolomite powder Download PDFInfo
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- CN108046621A CN108046621A CN201810106409.XA CN201810106409A CN108046621A CN 108046621 A CN108046621 A CN 108046621A CN 201810106409 A CN201810106409 A CN 201810106409A CN 108046621 A CN108046621 A CN 108046621A
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- calcined
- dolomite
- magnesia
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- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/104—Ingredients added before or during the burning process
Abstract
The invention discloses a kind of preparation methods of calcined dolomite powder, comprise the following steps：Dolomite is crushed to≤the particle of 1mm sizes, then by silicon containing component and broken dolomite is 0.5 in mass ratio:1~4:1 is uniformly mixed；After said mixture is calcined 15min ~ 4h at 800 DEG C ~ 1800 DEG C again, natural cooling after taking-up, and calcined dolomite powder is made to 1 ~ 80 μm in grinding.Calcined dolomite powder prepared by the present invention can be also used as cement expansive material as the main raw material(s) for preparing magnesium phosphate cement and magnesia oxychloride cement.The present invention utilizes the dolomite mineral of nature rich reserves, by introducing silicon containing component and obtaining after being calcined containing free MgO and the dolime powder without or with a small amount of free CaO, expands the source of raw materials of magnesium oxide in magnesia building material.Meanwhile preparation process is simple, reduces the energy consumption in raw materials of magnesium oxide production process, moreover it is possible to significantly reduce the cost of magnesia building materials requisite oxygen magnesium raw material, have good market prospects.
Description
Technical field
The invention belongs to building material field more particularly to a kind of preparation methods of calcined dolomite powder.
Background technology
Magnesium oxide material is widely used in the fields such as chemical industry, medicine, food processing, metallurgy and building trade.Magnesia
Material, mainly as one of main raw material(s) of magnesium gelatinous material, can be divided into light-burned in construction material by calcining production technology
Two kinds of magnesia and dead burned magnesia.Light calcined magnesia is mainly used in the production of magnesium oxychloride cement product in building material industry,
Light calcined magnesia and magnesium chloride brine with certain proportion, magnesia oxychloride cement can be configured to, with high-strength light, anti-fire screen
The advantages such as heat, energy conservation and environmental protection can be applied to prepare ventilation shaft, light cellular partition board and roof boarding, architectural decorative component and lines
The fields of grade.Dead burned magnesia is mainly used in building material industry and prepares magnesium phosphate cement, by phosphate, magnesia and delays
Solidifying agent is formulated according to a certain percentage, be by Acid-Base react based on cementitious material, have early-strong-fast-hard, adhesion strength
The good characteristics such as high and volume stability, can be applied to the necks such as engineering Rapid-Repair, reinforcing and danger wastes curing process
Domain.In addition, magnesium oxide powder is also used as cement expansive material, with aquation water requirement is few, expansion process is controllable, water
Change the advantages that product is stablized, be adapted to compensate for the contraction of mass concrete temperature drop, concrete self-shrinkage and dry contraction.
In magnesia building material, to the content of content and the activity of MgO in magnesia raw material, particularly free CaO
Deng there is strict demand.Because impurity content is low in magnesite, the magnesium oxide material performance calcined using magnesite is more easy to
In control.Therefore, the magnesium oxide material needed for the magnesia production of construction materials in China is mainly calcined by magnesite and obtained at present.But water chestnut
The distribution of magnesium ore resources is more concentrated and reserves are limited, it is difficult to meet the needs of construction material is to raw materials of magnesium oxide.
In addition to magnesite, the dolomite in nature also contains higher MgO.Dolomite is tellurian important calcium and magnesium
Resource has extremely abundant reserves.China has been surveyed various regions at bright dolomite mining area up to 208, reserves 82.2
Hundred million tons, and each mineral deposit has developed more.The distribution of dolomite is wider than magnesite in China, reserves more horn of plenty.
Although dolomite contains MgO, but be unable to the preparation that dinectly bruning is applied to magnesia building material.Because dolomite is high
Product after temperature calcining is usually the mixture of MgO and CaO, when particularly CaO content is higher, since the activity of CaO is very high,
Reaction can be participated in rapidly in existing magnesia production of construction materials application and generates unformed calcareous material so that setting time is difficult to
Control, and later stage remnants CaO is easy to cause the expansion dusting of product containing magnesium.Although low CaO can be obtained after low temperature calcination dolomite
The magnesium oxide powder of content, but be difficult the suitable calcining heat of control, temperature fluctuates in smaller range, it is possible to make
MgCO3CaCO when not decomposing completely3Just have occurred and that more decomposition, the magnesia in dolomite is underutilized, acquisition
Powder application value is limited.Also have at present using dolomite producing magnesium oxide by carbonization method, i.e., by dolomite calcination, digestion, carbonization
After obtain basic magnesium carbonate, then through thermally decomposing, calcine, crush, magnesia is made after selection by winnowing, although can reduce in magnesium oxide powder
The content of free CaO, but high energy consumption, efficiency are low and production process is complicated.
The content of the invention
It is existing that the demand of magnesia raw material and with dolomite magnesium oxide material is prepared for current magnesia building material
Technology above shortcomings, the object of the present invention is to provide a kind of preparation methods of calcined dolomite powder, solve existing utilization
Dolomite prepare method of magnesium oxide there are high energy consumption, efficiency is low, production process is complicated the problem of.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of preparation method of calcined dolomite powder：The dolomite of crushing is uniformly mixed with silicon containing component after 800 ~ 1800 DEG C
Calcining, by after calcined product grinding to get to the calcined dolomite powder.
The present invention by mixing suitable silicon containing component outside, in 800 ~ 1800 DEG C of dinectly brunings after being mixed with dolomite, due to
Silicon containing component can combine to form C with the CaO in calcined product2S, the mineral such as akermanite and diopside, eliminate white clouds
Free CaO in stone so as to effectively prevent in dolomite high-temperature calcination product, is unsuitable for straight due to free CaO activity is high
Connect the problem of preparing magnesia building material.
Preferably, the SiO of the silicon containing component2Content is more than 50%.SiO in silicon containing component2Content it is relatively low, other
The content of impurity can then increase, and after filling into dolomite, can influence the performance of calcined dolomite powder.
Preferably, the silicon containing component is at least one of Cab-O-sil, silicon ash, diatomite and clay.
Preferably, the mass ratio of the silicon containing component and dolomite is 0.5:1~4:1.This ratio contains with calcium in dolomite
Measure related, calcium content is higher, and the ratio of the silicon containing component of admixture is then higher.
Preferably, the calcination time is 15min ~ 4h.Calcination time is too long, and energy consumption can increase, and carry production cost
It is high.Calcination time can be more preferably 30min ~ 1h.
Preferably, dolomite dust is broken to below 1mm.Dolomite dust fineness is lower, contacted with silicon containing component it is more abundant,
More be conducive to C2The formation of the calcined products such as S.Dolomite smashing fineness can be further preferably to below 0.4mm.
Preferably, calcined product grinding is to 1 ~ 80 μm.
Calcined dolomite powder prepared by the present invention can be as the main oxidation magnesium for preparing magnesia oxychloride cement and magnesium phosphate cement
Raw material can also be used as cement expansive material.Wherein the difference of MgO activity is required according to different products, is used to prepare phosphorus
The calcined dolomite powder of sour magnesium cement is preferably that 1100 ~ 1800 DEG C of calcinings obtain, and is used to prepare the calcining white clouds of magnesia oxychloride cement
Mountain flour is preferably that 800 ~ 1200 DEG C of calcinings obtain, and the calcined dolomite powder for being used to prepare cement expansive material is preferably 800 ~ 1050
DEG C calcining obtains.
Compared with prior art, the present invention has the advantages that：
1st, compared with existing dolomite carbonizatin method prepares magnesia, it is more simple that the present invention prepares method of magnesium oxide, energy consumption
It is lower.It is to calcine dolomite, digest, being carbonized, filtering and realize separating calcium and magnesium that dolomite carbonizatin method, which prepares magnesia, at present,
High energy consumption and production process complexity.And of the invention by mixing silicon containing component outside dolomite, the dinectly bruning at 800 ~ 1800 DEG C,
Utilize SiO2Chemical reaction between dolomite forms C2S, the essential minerals such as akermanite and diopside eliminate free
CaO so that dolomite can meet the requirement for preparing magnesia building material to magnesia raw material.In addition, the C formed2S has
Higher hydration activity, the product formed after aquation can enhance the compaction rate of magnesium gelatinous material and intergranular bonding.Together
When, akermanite and diopside hardness are larger, and chemical property is stablized, and can play filling and skeleton function, be conducive to magnesium
The strength development of matter cementitious material and volume stability.
2nd, the magnesia building material in current China usually obtains magnesia raw material by way of calcined magnesite, the present invention
Obtained by way of dinectly bruning dolomite free CaO content it is low, even be free of free CaO magnesium oxide material, by white clouds
Stone is applied more broadly in magnesia building materials, takes full advantage of the dolomite of China's rich reserves.Due in dolomite calcium content compared with
Greatly, it is impossible to MgO is obtained by dinectly bruning, can be used as by the calcined dolomite powder for preparing of the present invention prepare magnesia oxychloride cement with
The main oxidation magnesium raw material of magnesium phosphate cement, meanwhile, this calcined dolomite powder is also used as cement expansive material.Cause
This, expands the range of choice of magnesia building material raw materials of magnesium oxide.
3rd, by the ratio of structure adjusting silicon containing component, calcining heat, calcination time and grinding fineness, can produce not
With the magnesia mixture of activity and content, meet the requirement of different practical engineering applications.For example, prepared by traditional magnesium phosphate cement
The dead burned magnesia powder used in the process is to be formed using magnesite in 1600 DEG C or more high-temperature calcinations, and usually by forging twice
Burning obtains, and the calcined dolomite powder that the present invention uses, and relatively low calcining heat may be employed due to introducing siliceous component, even
Down to 1100 DEG C, the energy consumption in the main raw material(s) production process of magnesium phosphate cement is significantly reduced, has saved production cost, had
There are good market prospects.
Description of the drawings
Fig. 1 is the XRD spectrum of calcined dolomite powder prepared by embodiment 2；
Fig. 2 is the XRD spectrum of calcined dolomite powder prepared by embodiment 3.
Specific embodiment
The present invention is described in further detail with reference to specific embodiment.
Embodiment 1
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By Cab-O-sil and broken dolomite in mass ratio 0.5:1 is uniformly mixed, SiO in Cab-O-sil2Content is 95%；
（3）Said mixture at 1150 DEG C is calcined into 2h, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 75 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 2
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By silicon ash and broken dolomite in mass ratio 1:1 is uniformly mixed, SiO in silicon ash2Content is 85%；
（3）Said mixture at 1300 DEG C is calcined into 3h, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 75 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 3
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By diatomite and broken dolomite in mass ratio 2.5:1 is uniformly mixed, SiO in diatomite2Content is 75%；
（3）Said mixture at 1650 DEG C is calcined into 1.5h, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 58 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 4
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By silicon containing component and broken dolomite in mass ratio 3.5:1 is uniformly mixed, and wherein silicon containing component is that mass ratio is 4:
1 Cab-O-sil and the mixture of silicon ash, SiO in Cab-O-sil and clay2Content is respectively 95% and 54%；
（3）Said mixture at 1800 DEG C is calcined into 3.5h, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 45 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 5
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By silicon containing component and broken dolomite in mass ratio 3:1 is uniformly mixed, and wherein silicon containing component is that mass ratio is 5:3:
1:1 Cab-O-sil, silicon ash, the mixture of diatomite and clay, SiO in Cab-O-sil, silicon ash, diatomite and clay2Content is distinguished
For 98%, 85%, 75% and 54%；
（3）Said mixture at 1100 DEG C is calcined into 4h, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 58 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 6
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By Cab-O-sil and broken dolomite in mass ratio 1.5:1 is uniformly mixed, SiO in Cab-O-sil2Content is 95%；
（3）Said mixture at 800 DEG C is calcined into 1h, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 58 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 7
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By silicon containing component and broken dolomite in mass ratio 2:1 is uniformly mixed, and wherein silicon containing component is that mass ratio is 2:1
Cab-O-sil and silicon ash mixture, SiO in Cab-O-sil and silicon ash2Content is respectively 95% and 85%；
（3）Said mixture at 1000 DEG C is calcined into 40min, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 75 μm of aperture sieves to get to the calcined dolomite powder.
Embodiment 8
The preparation method of calcined dolomite powder, comprises the following steps in the present embodiment：
（1）By dolomite crusher in crushing to below 1mm；
（2）By silicon ash and broken dolomite in mass ratio 3:1 is uniformly mixed, SiO in silicon ash2Content is 85%；
（3）Said mixture at 1200 DEG C is calcined into 20min, takes out simultaneously natural cooling；
（4）Calcined product grinding after cooling is crossed into 75 μm of aperture sieves to get to the calcined dolomite powder.
Comparative example 1
The method that magnesium phosphate cement dead burned magnesia is prepared using magnesite, is comprised the following steps：
（1）By the mining crusher in crushing of magnesite to below 1mm；
（2）Broken magnesite is calcined into 3h at 1700 DEG C, takes out simultaneously natural cooling；
（3）Calcined product grinding after cooling is crossed into 75 μm of aperture sieves, obtains dead burned magnesia.
Comparative example 2
The method that magnesia oxychloride cement light calcined magnesia is prepared using magnesite, is comprised the following steps：
（1）By the mining crusher in crushing of magnesite to below 1mm；
（2）Broken magnesite is calcined into 2h at 800 DEG C, takes out simultaneously natural cooling；
（3）Calcined product grinding after cooling is crossed into 75 μm of aperture sieves, obtains light calcined magnesia.
Fig. 1, Fig. 2 are respectively the XRD spectrum for the calcined dolomite powder that embodiment 2, embodiment 3 are prepared, from Fig. 1 and Fig. 2
In as can be seen that it is yellow long to yet form substantial amounts of calcium and magnesium in addition to containing MgO for the calcined dolomite powder for preparing of the method for the present invention
Stone, diopside and part C2The mineral such as S.It is observed in wherein Fig. 1 with the presence of a small amount of free CaO, trip has not been observed in Fig. 2
Exist from CaO.Therefore it can prove using method provided by the invention, can free CaO be obtained by dinectly bruning dolomite
Content is low, is even free of the magnesium oxide powder material of free CaO.
Application test 1
It can be used for preparing magnesium phosphate cement for calcined dolomite powder prepared by verification the method for the present invention, be prepared by embodiment 1 ~ 5
Dead burned magnesia prepared by calcined dolomite powder and comparative example 1 is respectively used to prepare magnesium phosphate cement.
Specially：By the calcined dolomite powder of 70 parts by weight or dead burned magnesia and the ammonium dihydrogen phosphate of 25 parts by weight, 5 weights
The borax of amount part is uniformly mixed, and is configured to magnesium phosphate cement.
By 7 kinds of cement samples of preparation according to《Cement strength testing method》(GB/T 17671-1999) carries out pressure resistance
Degree measures, wherein the fixed ratio of mud is 0.18.
The magnesium phosphate cement intensity experiment result that 1 embodiment 1 ~ 5 of table and 1 calcined product of comparative example are prepared
| Calcined dolomite powder | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Comparative example 1 |
| Setting time (min) | 10 | 14 | 13 | 19 | 11 | 17 |
| 3h compression strength（MPa） | 25.48 | 30.42 | 31.48 | 35.68 | 23.05 | 37.58 |
| 1d compression strength（MPa） | 42.32 | 49.38 | 49.94 | 54.74 | 39.74 | 55.76 |
As shown in Table 1, the magnesium phosphate cement setting time that prepared by the calcined dolomite powder made from embodiment 1 ~ 5 is more than 10min,
Construction requirement can be met.Meanwhile the intensity point of the magnesium phosphate cement 3h and 1d of the calcined dolomite powder preparation of the preparation of embodiment 4
Not Wei 35.68 MPa and 54.74 MPa, and the intensity of magnesium phosphate cement 3h and 1d prepared in comparative example with magnesite is respectively
37.58MPa and 55.76 MPa, the two strength development are very close.Therefore, above-mentioned experiment shows forging for the method for the present invention preparation
Calcined dolomite powder, available for preparing magnesium phosphate cement, magnesium phosphate water that magnesium phosphate cement and the traditional preparation methods of preparation obtain
Mud performance approaches, and its setting time, strength development can meet construction requirement.
Application test 2
It can be used for preparing magnesia oxychloride cement for calcined dolomite powder prepared by verification the method for the present invention, be prepared by embodiment 6 ~ 8
Light calcined magnesia prepared by calcined dolomite powder and comparative example 2 is respectively used to prepare magnesia oxychloride cement.
Specially：By the MgCl of 35 mass parts2·6H2O be dissolved in the water of 7 mass parts be allowed to be formed with it is certain density
MgCl2Aqueous solution, then the calcined dolomite powder of 58 mass parts or light calcined magnesia are uniformly mixed, then stir evenly obtained chlorine
Oxygen magnesium cement slurry.
The magnesia oxychloride cement intensity experiment result that 2 embodiment 6 ~ 8 of table and 2 calcined product of comparative example are prepared
| Calcined dolomite powder | Embodiment 6 | Embodiment 7 | Embodiment 8 | Comparative example 2 |
| 3d compression strength（MPa） | 52.56 | 50.33 | 51.39 | 53.48 |
| 28d compression strength（MPa） | 78.92 | 75.67 | 77. 64 | 80.37 |
As shown in Table 2, the magnesia oxychloride cement and 2 light-burned oxidation of comparative example that prepared by the calcined dolomite powder made from embodiment 6 ~ 8
Magnesia oxychloride cement prepared by magnesium is compared, 3d and 28d intensity approaches, and meets requirement of the magnesium oxychloride cement product to strength development.
Application test 3
The calcined dolomite powder prepared for verification the method for the present invention can be used as cement expansive material, be forged prepared by embodiment 6
Calcined dolomite powder is incorporated into as swelling agent in concrete, volume 6%（By cement quality percentage, outer doping）, it is prepared
Expansive concrete.According to GB23439-2009《Cement expansive material》Standard, test use concrete provided by the invention
With the limited expansion rate for the expansive concrete that swelling agent is prepared, test result is：The limited expansion rate of 7d in water
For 3.2%, the limited expansion rate of 21d is 1.3% in air, meets the technology requirement to additive.
The above embodiment of the present invention is only example to illustrate the invention, and is not the implementation to the present invention
The restriction of mode.For those of ordinary skill in the art, other can also be made not on the basis of the above description
With the variation and variation of form.Here all embodiments can not be exhaustive.It is every to belong to technical scheme
Changes and variations that derived from are still in the row of protection scope of the present invention.
Claims (8)
1. a kind of preparation method of calcined dolomite powder, which is characterized in that be uniformly mixed the dolomite of crushing with silicon containing component
After 800 ~ 1800 DEG C of calcinings, then by after calcined product grinding to get to the calcined dolomite powder.
2. the preparation method of calcined dolomite powder according to claim 1, which is characterized in that the SiO of the silicon containing component2
Content is more than 50%.
3. the preparation method of calcined dolomite powder according to claim 1, which is characterized in that the silicon containing component is silica
At least one of powder, silicon ash, diatomite and clay.
4. the preparation method of the calcined dolomite powder according to Claims 2 or 3, which is characterized in that the silicon containing component with
The mass ratio of dolomite is 0.5:1~4:1.
5. the preparation method of calcined dolomite powder according to claim 1, which is characterized in that the calcination time is
15min~4h。
6. the preparation method of calcined dolomite powder according to claim 1, which is characterized in that dolomite dust is broken to 1mm
Below.
7. the preparation method of calcined dolomite powder according to claim 1, which is characterized in that by calcined product grinding to 1 ~
80μm。
8. calcined dolomite powder prepared by any one of claim 1 to 7 the method is preparing magnesia oxychloride cement, magnesium phosphate cement
With the application in cement expansive material.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108911534A (en) * | 2018-07-09 | 2018-11-30 | 武汉科技大学 | A kind of preparation method of activity dolomite sand |
| CN110066128A (en) * | 2019-04-30 | 2019-07-30 | 镇江苏博特新材料有限公司 | A kind of magnesia swelling agent and preparation method thereof using the preparation of high calcium magnesite tailing |
| CN111847936A (en) * | 2020-06-30 | 2020-10-30 | 重庆纽镁特科技有限公司 | Novel phosphate cement and preparation method thereof |
| CN115504700A (en) * | 2022-09-29 | 2022-12-23 | 西南石油大学 | Preparation method of oil well cement expanding agent |
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| CN107074650A (en) * | 2014-11-24 | 2017-08-18 | 海德堡水泥公司 | The clinker alternative materials being made up of aluminosilicate and dolomite |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107074650A (en) * | 2014-11-24 | 2017-08-18 | 海德堡水泥公司 | The clinker alternative materials being made up of aluminosilicate and dolomite |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108911534A (en) * | 2018-07-09 | 2018-11-30 | 武汉科技大学 | A kind of preparation method of activity dolomite sand |
| CN110066128A (en) * | 2019-04-30 | 2019-07-30 | 镇江苏博特新材料有限公司 | A kind of magnesia swelling agent and preparation method thereof using the preparation of high calcium magnesite tailing |
| CN110066128B (en) * | 2019-04-30 | 2021-08-03 | 镇江苏博特新材料有限公司 | Magnesium expanding agent prepared from high-calcium magnesite tailings and preparation method thereof |
| CN111847936A (en) * | 2020-06-30 | 2020-10-30 | 重庆纽镁特科技有限公司 | Novel phosphate cement and preparation method thereof |
| CN111847936B (en) * | 2020-06-30 | 2022-03-18 | 重庆纽镁特科技有限公司 | Phosphate cement and preparation method thereof |
| CN115504700A (en) * | 2022-09-29 | 2022-12-23 | 西南石油大学 | Preparation method of oil well cement expanding agent |
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| CN108046621B (en) | 2021-01-15 |
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