CN104926165A - Carbonation-resistant basic magnesium sulfate cement and preparation method thereof - Google Patents
Carbonation-resistant basic magnesium sulfate cement and preparation method thereof Download PDFInfo
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Abstract
The invention discloses carbonation-resistant basic magnesium sulfate cement. The carbonation-resistant basic magnesium sulfate cement is prepared from the following components in percentage by mass: 40 to 55% of magnesium oxide, 20 to 25% of magnesium sulfate heptahydrate, 10 to 20% of industrial waste residue powder, 5 to 9% of white slag, 3 to 8% of mineral admixtures, 2 to 4% of desulfurization gypsum, 6 to 8% of mineral slag, 2 to 4% of straws, 1 to 3% of silica fume and 1 to 3% of adjustable solidification agent. Proper additives are added in magnesium oxysulfate cement to form a novel basic magnesium oxysulfate phase; the carbonation-resistant basic magnesium sulfate cement with totally different property and performance from traditional magnesium oxysulfate cement is produced; the main hydration product of the basic magnesium sulfate cement is 517 crystal whisker; the carbonation-resistant basic magnesium sulfate cement is novel special cement with features of self-formed crystal whisker, high intensity, high toughness, high ratio of compressive strength, carbonation resistance, brine resistance, hydrothermal resistance, seawater corrosion resistance, shock resistance, antifatigue, corrosion of steel bar resistance, high durability and long service life.
Description
[technical field]
The present invention relates to gelling material field, specifically relate to alkali magnesium sulfate cement of a kind of anti-carbonization and preparation method thereof.
[background technology]
Magnesium oxysulfide concrete and magnesia oxychloride cement can be called magnesium cement, have that quality is light, fire prevention, condensation be fast, sound insulation, the feature such as adiabatic.Magnesium oxysulfide concrete is compared with magnesia oxychloride cement, and its main advantage is that heat-resisting property is good, to the feature of reinforcement corrosion poor performance.The shortcoming that magnesium oxysulfide concrete one is fatal is that its strength ratio magnesia oxychloride cement is low, and even lower than silicate cement, this is also the major cause limiting magnesium oxysulfide concrete large-scale application.
Magnesium oxysulfide concrete is a kind of inorganic coagulation material be prepared into by Adlerika mix light calcined magnesia MgO powder.The microtexture of the kind of the intensity of cement material and its hydrated product, the relative content of hydrated product and cement is closely related, and magnesium oxysulfide concrete is no exception.Beaudoin is by analyzing the porosity of magnesium oxysulfide concrete and the relation of hardness, think that its porosity height is the major cause causing intensity low, study simultaneously and also point out, if what can ensure magnesium oxysulfide concrete and magnesia oxychloride cement has identical porosity, then the mechanical strength of magnesium oxysulfide concrete will close to magnesia oxychloride cement.Adopt less water cement ratio to prepare magnesium oxysulfide concrete, its intensity still can far below magnesia oxychloride cement.Therefore, determine that the major cause of magnesium oxysulfide concrete intensity should ascribe kind and the content of its hydration process and hydrated product thereof to.
Report according to Cole, 4 kinds of alkali formula magnesium oxysulfides can be there are in the magnesium oxysulfide concrete slurry that MgO ~ MgSO4 ~ H2O ternary system is prepared, i.e. 5Mg (OH) 2MgSO43H2O (513 phase), 3Mg (OH) 2MgSO48H2O (318 phase), Mg (OH) 22MgSO43H2O (123 phase) and Mg (OH) 2MgSO45H2O (115 phase), wherein only has 318 to be stable phase at 35 DEG C.After Urwrong have studied MgO ~ H2SO4 ~ H2O ternary system phasor, think at room temperature except there are 318 phases, also have MgSO4nH2O (n=7,6,1), Mg (OH) 2 and MgO, also there will be metastable 115 phases and MgSO44H2O, and point out, if the raw material started is MgO and magnesium sulfate or Adlerika, at room temperature can not prepare the hardened cement paste of 318 phase contents more than 50%.
At present, alkali magnesium sulfate cement of a kind of anti-carbonization of excellent performance and preparation method thereof is lacked.
[summary of the invention]
Technical problem to be solved by this invention is to provide alkali magnesium sulfate cement of a kind of anti-carbonization of excellent performance and preparation method thereof.
To achieve these goals, the present invention is by realizing according to lower technical scheme: the alkali magnesium sulfate cement of a kind of anti-carbonization of the present invention, and the alkali magnesium sulfate cement of described anti-carbonization is made up of the component of following mass percent:
Further, described magnesium oxide refers to magnesia powder powder material that calcined magnesite makes, salt lake brine extracts any one in the byproduct magnesia powder powder material produced in Quilonum Retard technological process or the combination of two kinds.
Further, described magnesium oxide is made up of the component of following mass percent:
Further, described slag is made up of the component of following mass percent: silicon-dioxide 35.50%, aluminium sesquioxide 12.29%, ferric oxide 2.45%, calcium oxide 36.68%, magnesium oxide 10.60%, sulphur trioxide 0.65%, sodium oxide 1.25%, potassium oxide 0.58%.
Further, described silicon ash is made up of the component of following mass percent: silicon-dioxide 92.00%, aluminium sesquioxide 1.00%, calcium oxide 0.50%, magnesium oxide 1.50%, sulphur trioxide 0.50%, ferric oxide 2.00%, sodium oxide 1.30%, potassium oxide 1.20%.
The method of the alkali magnesium sulfate cement of the anti-carbonization described in preparation of the present invention, comprise the steps: that (1) takes each component of aforementioned proportion by proportioning, magnesium oxide 40 ~ 55%, magnesium sulfate heptahydrate 20 ~ 25%, Industry Waste ground-slag 10 ~ 20%, white slag 5 ~ 9%, mineral admixture 3 ~ 8%, desulfurated plaster 2 ~ 4%, slag 6 ~ 8%, stalk 2 ~ 4%, silicon ash 1 ~ 3%, adjustable solidification agent 1 ~ 3%;
(2) magnesium sulfate heptahydrate is configured to solution;
(3) then magnesium oxide and desulfurated plaster are dropped in stirrer, finally again Industry Waste ground-slag, white slag, mineral admixture, slag, silicon ash, stalk and magnesium sulfate heptahydrate solution are dropped in stirrer, be stirred into slurry, add the adjustable solidification agent i.e. alkali magnesium sulfate cement of obtained anti-carbonization.
Further, in step (3), described magnesium oxide carries out calcining at temperature is 950 ~ 980 DEG C, levigately obtain powder, and fineness of powder is 100 ~ 300 orders, and the rate of tailing over is 6%.
Further, in step (3), stirring velocity is 1500 ~ 2000r/min.
Beneficial effect: define a kind of new alkali magnesium sulfate phase after the admixture that the present invention's admixture in magnesium oxysulfide concrete is suitable, and create the alkali magnesium sulfate cement with the anti-carbonization of the diverse performance of traditional magnesium oxysulfide concrete and feature, its main hydration products is high strength 517 whisker, belongs to a kind of whisker self-forming, high-strength, high tenacity, high backfin ratio, anti-carbonization, anti-bittern, water resistant heat, resistant to sea water, shock resistance, antifatigue, anti-carbonization, anti-steel bar corrosion, high durable, long-life new special cement.
Advantage of the present invention is as follows:
(1) intensity of the alkali magnesium sulfate cement of anti-carbonization is that its aquation is complete higher than the major cause of magnesium oxysulfide concrete, and containing a large amount of needle-like in the microtexture of densification.The alkali magnesium sulfate cement of anti-carbonization has synthesized pure alkali magnesium sulfate cenotype, pattern is pin crystalline rods, in Topas4.2 software, adopt simulated annealing to parse 5Mg (OH) 2MgSO47H2O is monoclinic crystal, and affiliated spacer is C121, and unit cell parameters is:
β=103.98o, crystalline density is 1.87g/cm3.This crystal is skeleton by Mg2-O octahedron, and SO42-, H2O and OH-are the laminate structure of filling ion (or molecule).
(2) traditional magnesium oxysulfide concrete ftractures after only starching the soaked 28d of test specimen, runs quickly and burst, and reason is that low activity MgO aquation produces crystalline stress, destroys cement structures.The alkali magnesium sulfate cement of anti-carbonization has more excellent water repelling property, and during without mineral admixture, the coefficient of softening of the soaked 180d of alkali magnesium sulfate concrete paste specimen of anti-carbonization can reach more than 0.85.The water repelling property of the alkali magnesium sulfate cement of the anti-carbonization of adding coal ash can further improve, and soaked 180d coefficient of softening can reach 0.98.Reason is that admixture has delayed the speed of MgO aquation in water, weaken the crystalline stress that MgO aquation produces, and intensity solubleness relatively of the present invention is lower.
(3) there is not cracking in the alkali magnesium sulfate cement of the anti-carbonization of admixture slag hydrothermal treatment consists 14d at 80 DEG C.Soak bittern 8 months, the alkali magnesium sulfate strength of cement of anti-carbonization goes up not down.In accelerated carbonation environment, there is not carbonization phenomenon in the alkali magnesium sulfate cement of anti-carbonization.In the alkali magnesium sulfate cement of anti-carbonization, extent of steel corrosion is far below the situation in magnesia oxychloride cement.In the alkali magnesium sulfate cement of anti-carbonization, the early stage rusting rate of reinforcing bar is higher than silicate cement, and the later stage reduces gradually, even can lower than the steel bar corrosion speed in silicate cement.During a small amount of nitrite inhibitor of admixture, reinforcing bar corrosion hardly in the alkali magnesium sulfate cement of anti-carbonization.
(4) be doped with stalk powder in the present invention, be conducive to improving toughness of the present invention, improve intensity of the present invention.
[accompanying drawing explanation]
Fig. 1 is the microtexture SEM shape appearance figure of the aquation 30d of traditional magnesium oxysulfide concrete;
Fig. 2 is the SEM shape appearance figure of the alkali magnesium sulfate cement 30d of the anti-carbonization of the present invention;
Fig. 3 is the SEM shape appearance figure of the C80 high performance concrete 30d of ordinary Portland cement preparation.
[embodiment]
Set forth the present invention further by the following examples, these embodiments are only presented for purposes of illustration, do not limit the scope of the invention.The experimental technique of unreceipted actual conditions in the following example, usually conveniently condition.
Embodiment 1
As depicted in figs. 1 and 2, Fig. 1 is the microtexture SEM shape appearance figure of the aquation 30d of traditional magnesium oxysulfide concrete; Fig. 2 is the SEM shape appearance figure of the alkali magnesium sulfate cement 30d of the anti-carbonization of the present invention; The alkali magnesium sulfate cement of the anti-carbonization adopting industrial raw material to prepare, hydrated product is 517 whiskers.
Visible, the aquation structure of traditional magnesium oxysulfide concrete is formed primarily of a large amount of sheet Mg (OH) 2 crystal, and short texture, hole is more.Microtexture after the alkali magnesium sulfate hydrated cementitious of anti-carbonization is made up of relatively more uniform a large amount of shank shape 517 whisker of spatial distribution, compact structure, not only there is Mg (OH) 2 gel phase, but also there is shank shape 517 whisker crystal, both are interweaved into continuous print three-D space structure network.
As shown in Figure 3, be the SEM shape appearance figure of the C80 high performance concrete 30d of ordinary Portland cement preparation.Microtexture after the alkali magnesium sulfate hydrated cementitious of anti-carbonization and the aquation microtexture of ordinary Portland cement closely similar.
The alkali magnesium sulfate cement of a kind of anti-carbonization of the present invention, the alkali magnesium sulfate cement of described anti-carbonization is made up of the component of following mass percent:
Described magnesium oxide refers to magnesia powder powder material that calcined magnesite makes, salt lake brine extracts any one in the byproduct magnesia powder powder material produced in Quilonum Retard technological process or the combination of two kinds.
Described magnesium oxide is made up of the component of following mass percent:
Described slag is made up of the component of following mass percent: silicon-dioxide 35.50%, aluminium sesquioxide 12.29%, ferric oxide 2.45%, calcium oxide 36.68%, magnesium oxide 10.60%, sulphur trioxide 0.65%, sodium oxide 1.25%, potassium oxide 0.58%.
Described silicon ash is made up of the component of following mass percent: silicon-dioxide 92.00%, aluminium sesquioxide 1.00%, calcium oxide 0.50%, magnesium oxide 1.50%, sulphur trioxide
0.50%, ferric oxide 2.00%, sodium oxide 1.30%, potassium oxide 1.20%.
The method of the alkali magnesium sulfate cement of the anti-carbonization described in preparation of the present invention, comprises the steps: that (1) takes each component of aforementioned proportion by proportioning, magnesium oxide 40 ~ 55%, magnesium sulfate heptahydrate 20%, Industry Waste ground-slag 10%, white slag 5%, mineral admixture 3%, desulfurated plaster 2%, slag 6%, stalk 2%, silicon ash 1%, adjustable solidification agent 1%
(2) magnesium sulfate heptahydrate is configured to solution;
(3) then magnesium oxide and desulfurated plaster are dropped in stirrer, finally again Industry Waste ground-slag, white slag, mineral admixture, slag, silicon ash, stalk and magnesium sulfate heptahydrate solution are dropped in stirrer, be stirred into slurry, add the adjustable solidification agent i.e. alkali magnesium sulfate cement of obtained anti-carbonization.
Described magnesium oxide carries out calcining at temperature is 950 DEG C, levigately obtain powder, and fineness of powder is 100 orders, and the rate of tailing over is 6%.Stirring velocity is 1500r/min.
A kind of new alkali magnesium sulfate phase is defined after the admixture that the present invention's admixture in magnesium oxysulfide concrete is suitable, and create the alkali magnesium sulfate cement with the anti-carbonization of the diverse performance of traditional magnesium oxysulfide concrete and feature, its main hydration products is high strength 517 whisker, belongs to a kind of whisker self-forming, high-strength, high tenacity, high backfin ratio, anti-carbonization, anti-bittern, water resistant heat, resistant to sea water, shock resistance, antifatigue, anti-carbonization, anti-steel bar corrosion, high durable, long-life new special cement.
Advantage of the present invention is as follows:
(1) intensity of the alkali magnesium sulfate cement of anti-carbonization is that its aquation is complete higher than the major cause of magnesium oxysulfide concrete, and containing a large amount of needle-like in the microtexture of densification.The alkali magnesium sulfate cement of anti-carbonization has synthesized pure alkali magnesium sulfate cenotype, pattern is pin crystalline rods, in Topas4.2 software, adopt simulated annealing to parse 5Mg (OH) 2MgSO47H2O is monoclinic crystal, and affiliated spacer is C121, and unit cell parameters is:
β=103.98o, crystalline density is 1.87g/cm3.This crystal is skeleton by Mg2-O octahedron, and SO42-, H2O and OH-are the laminate structure of filling ion (or molecule).
(2) traditional magnesium oxysulfide concrete ftractures after only starching the soaked 28d of test specimen, runs quickly and burst, and reason is that low activity MgO aquation produces crystalline stress, destroys cement structures.The alkali magnesium sulfate cement of anti-carbonization has more excellent water repelling property, and during without mineral admixture, the coefficient of softening of the soaked 180d of alkali magnesium sulfate concrete paste specimen of anti-carbonization can reach more than 0.85.The water repelling property of the alkali magnesium sulfate cement of the anti-carbonization of adding coal ash can further improve, and soaked 180d coefficient of softening can reach 0.98.Reason is that admixture has delayed the speed of MgO aquation in water, weaken the crystalline stress that MgO aquation produces, and intensity solubleness relatively of the present invention is lower.
(3) there is not cracking in the alkali magnesium sulfate cement of the anti-carbonization of admixture slag hydrothermal treatment consists 14d at 80 DEG C.Soak bittern 8 months, the alkali magnesium sulfate strength of cement of anti-carbonization goes up not down.In accelerated carbonation environment, there is not carbonization phenomenon in the alkali magnesium sulfate cement of anti-carbonization.In the alkali magnesium sulfate cement of anti-carbonization, extent of steel corrosion is far below the situation in magnesia oxychloride cement.In the alkali magnesium sulfate cement of anti-carbonization, the early stage rusting rate of reinforcing bar is higher than silicate cement, and the later stage reduces gradually, even can lower than the steel bar corrosion speed in silicate cement.During a small amount of nitrite inhibitor of admixture, reinforcing bar corrosion hardly in the alkali magnesium sulfate cement of anti-carbonization.
(4) be doped with stalk powder in the present invention, be conducive to improving toughness of the present invention, improve intensity of the present invention.
Embodiment 2
Embodiment 2 is with the difference of embodiment 1: the alkali magnesium sulfate cement of a kind of anti-carbonization of the present invention, and the alkali magnesium sulfate cement of described anti-carbonization is made up of the component of following mass percent:
Described magnesium oxide refers to magnesia powder powder material that calcined magnesite makes, salt lake brine extracts any one in the byproduct magnesia powder powder material produced in Quilonum Retard technological process or the combination of two kinds.
Described magnesium oxide is made up of the component of following mass percent:
The method of the alkali magnesium sulfate cement of the anti-carbonization described in preparation of the present invention, comprises the steps:, in step (1), to take each component of aforementioned proportion by proportioning, magnesium oxide 45%, magnesium sulfate heptahydrate 23%, Industry Waste ground-slag 15%, white slag 7%, mineral admixture 6%, desulfurated plaster 3%, slag 7%, stalk 3%, silicon ash 2%, adjustable solidification agent 2%;
In step (3), described magnesium oxide carries out calcining at temperature is 970 DEG C, levigately obtain powder, and fineness of powder is 200 orders.Stirring velocity is 1800r/min.
Embodiment 3
Embodiment 3 is with the difference of embodiment 1: the alkali magnesium sulfate cement of a kind of anti-carbonization of the present invention, and the alkali magnesium sulfate cement of described anti-carbonization is made up of the component of following mass percent:
The method of the alkali magnesium sulfate cement of the anti-carbonization described in preparation of the present invention, comprises the steps:, in step (1), to take each component of aforementioned proportion by proportioning, magnesium oxide 55%, magnesium sulfate heptahydrate 25%, Industry Waste ground-slag 20%, white slag 9%, mineral admixture 8%, desulfurated plaster 4%, slag 8%, stalk 4%, silicon ash 3%, adjustable solidification agent 3%;
In step (3), described magnesium oxide carries out calcining at temperature is 980 DEG C, levigately obtain powder, and fineness of powder is 300 orders.Stirring velocity is 2000r/min.
Test
By various embodiments of the present invention, the strength grade (with reference to silicate cement standard) of the alkali magnesium sulfate cement of anti-carbonization, reach 35.5R ~ 53.5R, 120d folding strength 14 ~ 23MPa, ultimate compression strength 45 ~ 80MPa, bend-press ratio 1/2 ~ 1/5, the alkali magnesium sulfate cement of anti-carbonization is a kind of high-strength novel cement material strong with superelevation, and there are 2 ~ 3 times to the folding strength of silicate cement, in civil engineering construction, demonstrate good application prospect.
The good toughness during bearing strength test of the alkali magnesium sulfate cement concrete pavement beam of anti-carbonization-equal bearing capacity level, mean that the antidetonation of concrete structure, anti-fatigue ability are strong.The alkali magnesium sulfate cement concrete pavement buildings of anti-carbonization, the life-span of structures, high-speed carbonation test: CO2 concentration >=98%, RH is 76% ± 5%, temperature is 27 ± 1 DEG C, carbonization result: flash carbonization 28d, carbonation depth is 0, and carbonation coefficient is 1.10, carbonization life in air: flash carbonization 28d, is equivalent to natural atmosphere environment carbonization 240 years.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and application claims protection domain is defined by appending claims, specification sheets and equivalent thereof.
Claims (8)
1. an alkali magnesium sulfate cement for anti-carbonization, is characterized in that: the alkali magnesium sulfate cement of described anti-carbonization is made up of the component of following mass percent:
2. the alkali magnesium sulfate cement of anti-carbonization according to claim 1, is characterized in that: described magnesium oxide refers to magnesia powder powder material that calcined magnesite makes, salt lake brine extracts any one in the byproduct magnesia powder powder material produced in Quilonum Retard technological process or the combination of two kinds.
3. the alkali magnesium sulfate cement of anti-carbonization according to claim 1, is characterized in that: described magnesium oxide is made up of the component of following mass percent:
4. the alkali magnesium sulfate cement of anti-carbonization according to claim 1, it is characterized in that: described slag is made up of the component of following mass percent: silicon-dioxide 35.50%, aluminium sesquioxide 12.29%, ferric oxide 2.45%, calcium oxide 36.68%, magnesium oxide 10.60%, sulphur trioxide 0.65%, sodium oxide 1.25%, potassium oxide 0.58%.
5. the alkali magnesium sulfate cement of anti-carbonization according to claim 1, it is characterized in that: described silicon ash is made up of the component of following mass percent: silicon-dioxide 92.00%, aluminium sesquioxide 1.00%, calcium oxide 0.50%, magnesium oxide 1.50%, sulphur trioxide 0.50%, ferric oxide 2.00%, sodium oxide 1.30%, potassium oxide 1.20%.
6. prepare the method for the alkali magnesium sulfate cement of anti-carbonization according to claim 1, it is characterized in that comprising the steps: that (1) takes each component of aforementioned proportion by proportioning, magnesium oxide 40 ~ 55%, magnesium sulfate heptahydrate 20 ~ 25%, Industry Waste ground-slag 10 ~ 20%, white slag 5 ~ 9%, mineral admixture 3 ~ 8%, desulfurated plaster 2 ~ 4%, slag 6 ~ 8%, stalk 2 ~ 4%, silicon ash 1 ~ 3%, adjustable solidification agent 1 ~ 3%;
(2) magnesium sulfate heptahydrate is configured to solution;
(3) then magnesium oxide and desulfurated plaster are dropped in stirrer, finally again Industry Waste ground-slag, white slag, mineral admixture, slag, silicon ash, stalk and magnesium sulfate heptahydrate solution are dropped in stirrer, be stirred into slurry, add the adjustable solidification agent i.e. alkali magnesium sulfate cement of obtained anti-carbonization.
7. the preparation method of the alkali magnesium sulfate cement of anti-carbonization according to claim 6, it is characterized in that: in step (3), described magnesium oxide carries out calcining at temperature is 950 ~ 980 DEG C, levigately obtain powder, and fineness of powder is 100 ~ 300 orders, and the rate of tailing over is 6%.
8. the preparation method of the alkali magnesium sulfate cement of anti-carbonization according to claim 6, is characterized in that: in step (3), and stirring velocity is 1500 ~ 2000r/min.
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Cited By (8)
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| CN105461282A (en) * | 2015-11-20 | 2016-04-06 | 南京福臻再生资源科技股份有限公司 | Alkaline-magnesium special cement and a preparing method thereof |
| CN105565765A (en) * | 2015-12-18 | 2016-05-11 | 卓达新材料科技集团威海股份有限公司 | Magnesium oxysulfate plate production process |
| CN107879700A (en) * | 2017-11-14 | 2018-04-06 | 湖州力奥电梯配件有限公司 | A kind of lift car Knapsack-rack bottom girder |
| CN107892496A (en) * | 2017-11-14 | 2018-04-10 | 湖州力奥电梯配件有限公司 | A kind of slag of elevator hoistways upper beam structure |
| CN108975742A (en) * | 2018-07-16 | 2018-12-11 | 安徽耐特嘉信息科技有限公司 | A kind of multi-functional compound mother liquor for building material and composite board |
| CN111662069A (en) * | 2020-06-18 | 2020-09-15 | 上海鼎中新材料有限公司 | External hanging light stone molded by desulfurized gypsum industrial waste residue and method |
| CN112456955A (en) * | 2020-12-01 | 2021-03-09 | 西南科技大学 | Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof |
| CN115558996A (en) * | 2022-09-09 | 2023-01-03 | 中国科学院青海盐湖研究所 | Method for preparing 517 type basic magnesium sulfate whisker under mild condition |
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| CN112456955A (en) * | 2020-12-01 | 2021-03-09 | 西南科技大学 | Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof |
| CN112456955B (en) * | 2020-12-01 | 2022-06-03 | 西南科技大学 | Basic magnesium sulfate cement-based lightweight porous material and preparation method thereof |
| CN115558996A (en) * | 2022-09-09 | 2023-01-03 | 中国科学院青海盐湖研究所 | Method for preparing 517 type basic magnesium sulfate whisker under mild condition |
| CN115558996B (en) * | 2022-09-09 | 2024-04-12 | 中国科学院青海盐湖研究所 | Method for preparing 517 type basic magnesium sulfate whisker under mild condition |
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Application publication date: 20150923 |