CN104499040A - Method for preparing gypsum whisker - Google Patents
Method for preparing gypsum whisker Download PDFInfo
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- CN104499040A CN104499040A CN201410737390.0A CN201410737390A CN104499040A CN 104499040 A CN104499040 A CN 104499040A CN 201410737390 A CN201410737390 A CN 201410737390A CN 104499040 A CN104499040 A CN 104499040A
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- whisker
- gypsum
- crystal whisker
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- 239000010440 gypsum Substances 0.000 title claims abstract description 52
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 33
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 64
- 235000011132 calcium sulphate Nutrition 0.000 claims abstract description 31
- 235000019738 Limestone Nutrition 0.000 claims abstract description 30
- 239000006028 limestone Substances 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 18
- 239000001117 sulphuric acid Substances 0.000 claims abstract description 14
- 235000011149 sulphuric acid Nutrition 0.000 claims abstract description 14
- 239000001175 calcium sulphate Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 12
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 8
- 239000013078 crystal Substances 0.000 claims description 40
- 229960001763 zinc sulfate Drugs 0.000 claims description 11
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000011161 development Methods 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 abstract 2
- 239000010802 sludge Substances 0.000 abstract 2
- 239000003054 catalyst Substances 0.000 abstract 1
- 235000009529 zinc sulphate Nutrition 0.000 abstract 1
- 239000011686 zinc sulphate Substances 0.000 abstract 1
- 229940095672 calcium sulfate Drugs 0.000 description 16
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 2
- 229940095564 anhydrous calcium sulfate Drugs 0.000 description 2
- 239000002216 antistatic agent Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 150000004683 dihydrates Chemical class 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910010272 inorganic material Inorganic materials 0.000 description 2
- 239000011147 inorganic material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229940057306 hemihydrate calcium sulfate Drugs 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000003053 toxin Substances 0.000 description 1
- 231100000765 toxin Toxicity 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention provides a method for preparing a gypsum whisker. The method comprises the following steps of: (1) drying limestone sludge to obtain limestone powder; (2) adding a certain amount of limestone powder to dilute sulphuric acid for reaction to generate calcium sulphate; (3) filtering the calcium sulphate obtained from the step (2), then adding water to prepare a calcium sulphate solution and controlling the concentration of the calcium sulphate solution, then adding zinc sulphate as a catalyst for hydrothermal reaction, and filtering to obtain a hemihydrate gypsum whisker; (4) drying the hemihydrate gypsum whisker to obtain an anhydrous gypsum whisker. The method for preparing the gypsum whisker, which is provided by the invention, changes the wastes into valuables by utilizing the limestone sludge regarded as waste residues and waste sulphuric acid liquor which are generated in the steel industry to prepare the anhydrous gypsum whisker with excellent properties. The method disclosed by the invention can not only be used for reducing the production cost of the gypsum whisker, but also be used for protecting the environment, thereby generating preferable influence on the harmonious development of society and environment.
Description
Technical field
The invention belongs to technical field of inorganic material, be specifically related to a kind of method preparing crystal whisker of gypsum.
Background technology
Whisker is atomic structural arrangement high-sequential when crystallization, so that do not hold the larger defect that can slacken crystal, as imperfect in granular boundary, cavity, dislocation and structure etc., near-complete crystal, cause the intensity of whisker close to the theoretical strength of valence link between material atom, considerably beyond other strongtheners of a large amount of use at present.
Crystal whisker of gypsum (i.e. calcium sulfate crystal whiskers Calcium Sulfate Whisker, also known as calcium sulphate micro-fibre, international commodity name is called ONODA-GPF) is a kind of novel inorganic materials with very high combination property.Calcium sulfate crystal whiskers is divided into anhydrous, Ban Shui, three kinds, two water, and wherein anhydrous calcium sulfate whisker intensity is the highest.Dihydrate gypsum whiskers does not have the enhancement of whisker when using more than 110 DEG C, prospects for commercial application is little; Anhydrous and hemihydrate calcium sulfate crystal whisker then has higher intensity and use value.
Crystal whisker of gypsum is as fibrous single crystal, have perfect structure, complete profile, specific cross section, stable size, be a kind of non-metallic material having many properties, length-to-diameter ratio is usually between 30-100, mean length is 30-400 μm, and mean diameter is 1-10 μm.Compared with other staple fibre, have high temperature resistant, resist chemical, good toughness, intensity are high, easily carry out surface treatment, low toxin strong with the affinity of the polymkeric substance such as rubber plastic, and price is lower in whisker, there is the unrivaled ratio of performance to price of other whisker.The range of application of crystal whisker of gypsum widely, is mainly used in the aspect such as manufacture of paper industry, matrix material enhancing, abrasives, Environmental Engineering Material, light building material, lagging material, coating, paint, antistatic material.The problems such as at present, the method preparing crystal whisker of gypsum is more, and various method has their own characteristics each, but it is high all to there is production cost, and product is uneven containing crystal water, length-to-diameter ratio, and production method control condition is harsh.
Wingdale mud is manufacturing the limestone crushing dedusting damping mud produced in unslaked lime process, Baosteel in converter steelmaking production process, in order to slag making often needs to add a certain amount of unslaked lime to regulate slag basicity.Therefore, about 200,000 tons, Wingdale mud producing every year of Baosteel.These Wingdale mud, as waste, are piled up for a long time, are starved of and find a kind of effectively process approach.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of method preparing crystal whisker of gypsum, utilizes Wingdale mud to prepare the problem of the method for crystal whisker of gypsum for solving in prior art to lack.
For achieving the above object and other relevant objects, the invention provides a kind of method preparing crystal whisker of gypsum, comprise the following steps:
1) Wingdale mud is dried, obtain limestone powder;
Preferably, the main component in described Wingdale mud is calcium carbonate (CaCO
3).Content >=the 90wt% of calcium carbonate in described Wingdale mud.
Preferably, described bake out temperature is 450-650 DEG C.Further, described bake out temperature is 500 DEG C.
Preferably, described drying time is 2-4 hour.
Preferably, the particle diameter of described limestone powder is 1-10 μm.
2) get in a certain amount of limestone powder and add dilute sulphuric acid reaction, generate calcium sulfate;
Preferably, described dilute sulphuric acid is the sulfuric acid waste produced in industrial production.
Preferably, described dilute sulphuric acid is aqueous sulfuric acid.Further, the concentration of described dilute sulphuric acid is 5-15wt%.
Preferably, the described reaction times is 4 ± 1 hours.Further, the described reaction times is 4 hours.
Preferably, the amount of substance equivalent or excessive of calcium carbonate in the add-on of described dilute sulphuric acid and limestone powder.Thus calcium carbonate is fully reacted.
3) by step 2) in obtain calcium sulfate filter after, add water and be made into calcium sulphate soln and control its concentration, then add zinc sulfate as catalyzer, after carrying out hydro-thermal reaction, filter and obtain semi-hydrated gypsum whisker;
Preferably, described calcium sulphate soln is the calcium sulfate aqueous solution.
Preferably, the concentration of described calcium sulphate soln controls as 10-30wt%.
Preferably, described zinc sulfate is 1:15-25 with the ratio of the weight added of limestone powder.
Further, described zinc sulfate is 1:20 with the ratio of the weight added of limestone powder.
Preferably, the condition of described hydro-thermal reaction is: reaction vessel: autoclave; Temperature of reaction: 120 ± 5 DEG C; Reaction times: 1 ± 0.5 hour.
Further, the condition of described hydro-thermal reaction is: reaction vessel: autoclave; Temperature of reaction: 120 DEG C; Reaction times: 1 hour.
The principle of described hydro-thermal reaction is: granular dihydrate gypsum produces structural rearrangement under high-temperature water heat condition, and crystal carries out one-dimensional growth, becomes fibrous semi-hydrated gypsum whisker.
Preferably, described filtration adopts strainer filtering.Described filter screen is the conventional 300 order nylon leaching nets used.
4) by after the drying of semi-hydrated gypsum whisker, dehydrated gyp-whisker is obtained.
Preferably, the condition of described drying treatment is: processing vessel: drying oven; Treatment temp: 220 ± 10 DEG C; Treatment time: 1 ± 0.5 hour.
Further, the condition of described drying treatment is: processing vessel: drying oven; Treatment temp: 220 DEG C; Treatment time: 1 hour.
Present invention also offers a kind of Wingdale mud and prepare the application in crystal whisker of gypsum according to the method preparing crystal whisker of gypsum.
As mentioned above; a kind of method preparing crystal whisker of gypsum of the present invention; from the angle of refuse reclamation, protection of the environment; " turn waste into wealth utilizing the Wingdale mud being regarded as waste residue that produces in Steel industry and sulfuric acid waste "; utilizing hydrothermal method to be translated into quality, high (whisker length is 100-180 μm; length-to-diameter ratio 60-100), economic value added is high, range of application is dehydrated gyp-whisker more widely.The dehydrated gyp-whisker stable chemical nature prepared in the present invention, can be widely used in the aspect such as manufacture of paper industry, matrix material enhancing, abrasives, Environmental Engineering Material, light building material, lagging material, coating, paint, antistatic material.A kind of method preparing crystal whisker of gypsum of the present invention, by set preferred condition thus overcome prepare the length-to-diameter ratio that crystal whisker of gypsum exists uneven, containing problems such as crystal water.A kind of method preparing crystal whisker of gypsum in the present invention; belong to typical green chemistry process; meet the requirement of the strategy of sustainable development completely; not only reduce the production cost of crystal whisker of gypsum; and protect environment; be applied in actual production and will play certain pushing effect to socio-economic development, producing harmonious development that is social and environment affects preferably.
Accompanying drawing explanation
Fig. 1 is shown as a kind of process flow diagram preparing the method for crystal whisker of gypsum of the present invention
Fig. 2 is shown as the scanning electron microscope sem shape appearance figure of crystal whisker of gypsum in the present invention
Embodiment
Set forth the present invention further below in conjunction with specific embodiment, should be understood that these embodiments are only not used in for illustration of the present invention and limit the scope of the invention.
Below by way of specific specific examples, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification sheets can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification sheets also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
The raw material that following examples adopt and equipment:
1, raw material
Wingdale mud, sulfuric acid waste, purchased from upper Hypon smelting slag comprehensive exploitation Industrial Co., Ltd.; Water is tap water; Zinc sulfate, purity 97%, purchased from Wujiang Nan Lin Fine Chemical Co., Ltd.
2, equipment
GCF-1L type autoclave, purchased from Dalian automatic control equipment factory; SX2-4-10 type drying oven, purchased from Maanshan City's electric furnace factory.
Embodiment 1
As shown in Figure 1, after Wingdale mud is dried 3 hours at 500 DEG C, the limestone powder that particle diameter is 1-10 μm is obtained.Get 50g limestone powder, add and carry out reaction 4 hours with main composition-calcium carbonate equivalent in limestone powder or excessive 5wt% dilute sulphuric acid, generate calcium sulfate.After the calcium sulfate obtained is filtered, add water and be made into calcium sulphate soln and the concentration controlling its solution is 10wt%, and then to add with the ratio of Wingdale weight be that the zinc sulfate of 1:20 is as catalyzer, in the autoclave of 120 DEG C, hydro-thermal is carried out after 1 hour at control temperature, take out and filter, filtrate is semi-hydrated gypsum whisker, drier 1 hour of drying oven semi-hydrated gypsum whisker being put into immediately 220 DEG C, namely obtains dehydrated gyp-whisker.
Embodiment 2
As shown in Figure 1, after Wingdale mud is dried 3 hours at 500 DEG C, the limestone powder that particle diameter is 1-10 μm is obtained.Get 50g limestone powder, add and carry out reaction 4 hours with main composition-calcium carbonate equivalent in limestone powder or excessive 15wt% dilute sulphuric acid, generate calcium sulfate.After the calcium sulfate obtained is filtered, add water and be made into calcium sulphate soln and the concentration controlling its solution is 10wt%, and then to add with the ratio of Wingdale weight be that the zinc sulfate of 1:20 is as catalyzer, in the autoclave of 120 DEG C, hydro-thermal is carried out after 1 hour at control temperature, take out and filter, filtrate is semi-hydrated gypsum whisker, drier 1 hour of drying oven semi-hydrated gypsum whisker being put into immediately 220 DEG C, namely obtains dehydrated gyp-whisker.
Embodiment 3
As shown in Figure 1, after Wingdale mud is dried 2 hours at 650 DEG C, the limestone powder that particle diameter is 1-10 μm is obtained.Get 50g limestone powder, add and carry out reaction 3 hours with main composition-calcium carbonate equivalent in limestone powder or excessive 15wt% dilute sulphuric acid, generate calcium sulfate.After the calcium sulfate obtained is filtered, add water and be made into calcium sulphate soln and the concentration controlling its solution is 30wt%, and then to add with the ratio of Wingdale weight be that the zinc sulfate of 1:20 is as catalyzer, in the autoclave of 115 DEG C, hydro-thermal is carried out after 1.5 hours at control temperature, take out and filter, filtrate is semi-hydrated gypsum whisker, drier 1.5 hours of drying oven semi-hydrated gypsum whisker being put into immediately 210 DEG C, namely obtains dehydrated gyp-whisker.
Embodiment 4
As shown in Figure 1, after Wingdale mud is dried 4 hours at 450 DEG C, the limestone powder that particle diameter is 1-10 μm is obtained.Get 50g limestone powder, add and carry out reaction 5 hours with main composition-calcium carbonate equivalent in limestone powder or excessive 5wt% dilute sulphuric acid, generate calcium sulfate.After the calcium sulfate obtained is filtered, add water and be made into calcium sulphate soln and the concentration controlling its solution is 20wt%, and then to add with the ratio of Wingdale weight be that the zinc sulfate of 1:20 is as catalyzer, in the autoclave of 125 DEG C, hydro-thermal is carried out after 0.5 hour at control temperature, take out and filter, filtrate is semi-hydrated gypsum whisker, drier 0.5 hour of drying oven semi-hydrated gypsum whisker being put into immediately 230 DEG C, namely obtains dehydrated gyp-whisker.
Embodiment 5
As shown in Figure 1, after Wingdale mud is dried 3 hours at 500 DEG C, the limestone powder that particle diameter is 1-10 μm is obtained.Get 50g limestone powder, add and carry out reaction 4 hours with main composition-calcium carbonate equivalent in limestone powder or excessive 7.5wt% dilute sulphuric acid, generate calcium sulfate.After the calcium sulfate obtained is filtered, add water and be made into calcium sulphate soln and the concentration controlling its solution is 15wt%, and then to add with the ratio of Wingdale weight be that the zinc sulfate of 1:20 is as catalyzer, in the autoclave of 120 DEG C, hydro-thermal is carried out after 1 hour at control temperature, take out and filter, filtrate is semi-hydrated gypsum whisker, drier 1 hour of drying oven semi-hydrated gypsum whisker being put into immediately 220 DEG C, namely obtains dehydrated gyp-whisker.
Embodiment 6
By the dehydrated gyp-whisker prepared in embodiment 1-5, adopt scanning electron microscope to scan, as shown in Figure 2, under scanning electron microscope sem amplifies the condition of 250 times, dehydrated gyp-whisker can be observed there is filamentary structure.Meanwhile, adopt scanning electron microscope to detect the specification of the dehydrated gyp-whisker prepared in embodiment 1-5, concrete data are in table 1.As shown in Table 1, dehydrated gyp-whisker steady quality, the length of its whisker is about 100-180 μm, and length-to-diameter ratio is about 60-100.Visible, this filamentary structure, excellent performance, can be widely used in multiple field.
The detected result of table 1. material performance index
| Classification | Whisker length value range (μm) | Whisker length (μm) | Length-to-diameter ratio value range | Length-to-diameter ratio |
| Embodiment 1 | 30-400 | 180 | 30-100 | 100 |
| Embodiment 2 | 30-400 | 180 | 30-100 | 100 |
| Embodiment 3 | 30-400 | 100 | 30-100 | 60 |
| Embodiment 4 | 30-400 | 100 | 30-100 | 60 |
| Embodiment 5 | 30-400 | 150 | 30-100 | 80 |
In sum, a kind of method preparing crystal whisker of gypsum of the present invention, utilize the Wingdale mud being regarded as waste residue that produces in Steel industry and sulfuric acid waste " to turn waste into wealth ", preparation has the dehydrated gyp-whisker of excellent properties.The method not only reduces the production cost of crystal whisker of gypsum, and protects environment, and producing harmonious development that is social and environment affects preferably.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (10)
1. prepare a method for crystal whisker of gypsum, comprise the following steps:
1) Wingdale mud is dried, obtain limestone powder;
2) get in a certain amount of limestone powder and add dilute sulphuric acid reaction, generate calcium sulfate;
3) by step 2) in obtain calcium sulfate filter after, add water and be made into calcium sulphate soln and control its concentration, then add zinc sulfate as catalyzer, after carrying out hydro-thermal reaction, filter and obtain semi-hydrated gypsum whisker;
4) by after the drying of semi-hydrated gypsum whisker, dehydrated gyp-whisker is obtained.
2. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 1) in, the particle diameter of described limestone powder is 1-10 μm.
3. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 1) in, described bake out temperature is 450-650 DEG C; Described drying time is 2-4 hour.
4. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 2) in, the concentration of described dilute sulphuric acid is 5-15wt%.
5. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 2) in, the described reaction times is 3-5 hour.
6. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 3) in, the concentration of described calcium sulphate soln controls as 10-30wt%.
7. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 3) in, described zinc sulfate is 1:15-25 with the ratio of the weight added of limestone powder.
8. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 3) in, the condition of described hydro-thermal reaction is: reaction vessel: autoclave; Temperature of reaction: 115-125 DEG C; Reaction times: 0.5-1.5 hour.
9. a kind of method preparing crystal whisker of gypsum according to claim 1, is characterized in that, step 4) in, the condition of described drying treatment is: processing vessel: drying oven; Treatment temp: 210-230 DEG C; Treatment time: 0.5-1.5 hour.
10. a Wingdale mud, is preparing the application in crystal whisker of gypsum according to the arbitrary a kind of described method preparing crystal whisker of gypsum of claim 1-9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105112989A (en) * | 2015-10-14 | 2015-12-02 | 科洋环境工程（上海）有限公司 | Preparation method of calcium sulfate whisker |
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