CN108085740A - A kind of preparation method of anhydrous calcium sulfate whisker - Google Patents
A kind of preparation method of anhydrous calcium sulfate whisker Download PDFInfo
- Publication number
- CN108085740A CN108085740A CN201711487486.6A CN201711487486A CN108085740A CN 108085740 A CN108085740 A CN 108085740A CN 201711487486 A CN201711487486 A CN 201711487486A CN 108085740 A CN108085740 A CN 108085740A
- Authority
- CN
- China
- Prior art keywords
- calcium sulfate
- whisker
- anhydrous calcium
- preparation
- sulfuric acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/14—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions the crystallising materials being formed by chemical reactions in the solution
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/46—Sulfur-, selenium- or tellurium-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/62—Whiskers or needles
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a kind of preparation methods of anhydrous calcium sulfate whisker, include the following steps：S1. excessive gypsum powder is added in sulfuric acid solution and stirred evenly, filter out filter residue, the dispersant of 0.5~1wt% and the crystal modifier of 0.03~0.08wt% are sequentially added into filtrate, after stirring evenly, mixed solution is aged 1~2h in the case where temperature is 95~105 DEG C, after the completion of reaction, product is filtered and is washed, obtain hemihydrate calcium sulfate crystal whisker；S2. the hemihydrate calcium sulfate crystal whisker in drying steps S1 is to get anhydrous calcium sulfate whisker.The technical program is directly acidified gypsum powder, SO with sulfuric acid solution4 2‑Amount be more than Ca2+Amount, be conducive to generate hemihydrate calcium sulfate crystal whisker, while accelerate whisker growth speed；A certain amount of dispersant and crystal modifier are added in, is 95~105 DEG C of 1~2h of ageing in temperature, advantageously forms the calcium sulfate crystal whiskers of particle size and draw ratio evenly.
Description
Technical field
The invention belongs to inorganic chemical industry technical field of material, and in particular to a kind of preparation side of anhydrous calcium sulfate whisker
Method.
Background technology
Calcium sulfate crystal whiskers are called crystal whisker of gypsum, are the fibrous monocrystal of calcium sulfate, are divided into as anhydrous calcium sulfate whisker, and half
H 2 O calcium sulphate whisker and anhydrous calcium sulfate whisker, wherein hemihydrate calcium sulfate crystal whisker and anhydrous calcium sulfate whisker, especially anhydrous sulphur
Sour calcium pyroborate has larger intensity and higher use value.Anhydrous calcium sulfate whisker building, medicine, plastics, rubber and
Field of environment protection has important purposes, very extensive in the field application of composite material reinforcing component.
The enhancing performance and its appearance structure of anhydrous calcium sulfate whisker are closely related.General diameter is smaller, and draw ratio is bigger,
The enhancing performance of anhydrous calcium sulfate whisker is better；The granularity of whisker is more uniform, and the whole enhancing performance of anhydrous calcium sulfate whisker is got over
It is good.The preparation method of anhydrous calcium sulfate whisker mainly has water autoclave method and normal pressure acidization at present.Water autoclave method is by certain matter
The dihydrate gypsum suspension of amount fraction is added in hydrothermal reaction kettle, is depressed and is reacted in saturated vapor, tiny acicular sulfuric acid is made
Calcium pyroborate.This kind of method has many advantages, such as high conversion rate and simple for process, but generally requires temperature at 100-200 DEG C, to hydro-thermal
The requirement of reaction unit is high, and production cost is higher, and industrial applications are subject to certain restrictions.Some of which method also needs to add in certain
The crystal seed and additive of ratio, process complexity and cost increase, and regulation and control are cumbersome.Normal pressure acidization refers to two water of high concentration
Gypsum suspension is placed in the acid solution under certain temperature, by regulating and controlling acidity (pH value) and reaction temperature, is allowed to change into
Needle-shaped or fibrous hemihydrate calcium sulfate crystal whisker.Compared with water autoclave method, high temperature, high-pressure reactor is not required in the method, and cost has
It is reduced.But the granule size of anhydrous calcium sulfate whisker is uneven made from this method, draw ratio is uneven, to anhydrous slufuric acid
The enhancing performance of calcium pyroborate affects.
The content of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, a kind of preparation method of anhydrous calcium sulfate whisker is proposed, solve
Certainly anhydrous calcium sulfate whisker granule size is uneven in the prior art and the non-uniform technical problem of draw ratio.
To reach above-mentioned technical purpose, technical scheme provides a kind of preparation method of anhydrous calcium sulfate whisker,
Include the following steps：
S1. excessive gypsum powder is added in sulfuric acid solution and stirred evenly, filter out filter residue, added successively into filtrate
Enter the dispersant of 0.5~1wt% and the crystal modifier of 0.03~0.08wt%, after stirring evenly, by mixed solution temperature be 95
1~2h is aged at~105 DEG C, after the completion of reaction, product is filtered and is washed, obtain hemihydrate calcium sulfate crystal whisker；
S2. the hemihydrate calcium sulfate crystal whisker in drying steps S1 is to get anhydrous calcium sulfate whisker.
Compared with prior art, beneficial effects of the present invention include：The technical program is directly acidified raw stone with sulfuric acid solution
Cream powder, SO4 2-Amount be more than Ca2+Amount, be conducive to Ca2+And SO4 2-With reference to generation hemihydrate calcium sulfate crystal whisker, while whisker growth
The speed of process can also be accelerated；Excessive gypsum powder is directly used as raw material, gypsum and sulfuric acid solution can be increased
Contact area is accelerated to form the speed of supersaturated solution, is conducive to generate calcium sulfate crystal whiskers；Add in dispersant and crystal modifier, profit
The peptizaiton of mixed solution and the solution component allotment of crystal modifier are acted on dispersant, the two and sulfuric acid solution cooperation make
With, there is selective absorption effect on solid product surface, inhibit the radial growth of whisker, promotion axial growth and whisker disperses
It obtains evenly；The dosage of control dispersant and crystal modifier not only can make reaction carry out more thorough, be also beneficial to form grain
The calcium sulfate crystal whiskers of footpath size and draw ratio evenly.Aging Temperature in the technical program is 95~105 DEG C, and digestion time is
1~2h is conducive to the generation of hemihydrate calcium sulfate crystal whisker and the stabilization of shape characteristic.Method using the present invention can obtain major diameter
Than the anhydrous calcium sulfate whisker with granule size evenly, reinforcing material can be used as plastics, rubber, papermaking, ceramics, cement
Etc. industries.
Specific embodiment
The present embodiment provides a kind of preparation methods of anhydrous calcium sulfate whisker, specifically comprise the following steps：
(1) pretreatment of raw material：Gypsum of the purity more than 90% is crushed and carries out fine grinding, screens out grain size less than 20mm
Gypsum powder.
(2) stock up according to following mass ratio：It is 2~4 according to the mass ratio of gypsum powder and sulfuric acid solution:1 weighs life
The concentration of gypsum powder and sulfuric acid solution, wherein sulfuric acid solution is 10%~20%；Then it is molten according to dispersant and sulfuric acid respectively
Liquid mass ratio is 0.005~0.01 and crystal modifier and sulfuric acid solution mass ratio are 0.0003~0.0008 to weigh dispersant and turn
Brilliant agent；
(3) ageing reaction：Gypsum powder is added in into sulfuric acid solution, it is stirring while adding, after being uniformly mixed, filter out
Then filter residue sequentially adds the dispersant of 0.5~1wt% and the crystal modifier of 0.03~0.08wt%, dispersant choosing into filtrate
With lauryl sodium sulfate or dodecyl sulphate potassium, both substances belong to alkali metal fatty acid salt, add in above-mentioned mix
Zoarium system will not only inhibit the growth of calcium sulfate crystal whiskers, moreover it is possible to provide SO4 2-Promote calcium sulfate crystal whiskers growth, crystal modifier by
Alum and sodium citrate composition, and the mass ratio of alum and sodium citrate is 7~9:1, K+And Al3+With RCOO-Shape
Into complex compound, inhibit the radial growth of calcium sulfate crystal whiskers, so as to improve draw ratio；Filtrate containing dispersant and crystal modifier is stirred
It mixes after mixing, mixed solution is placed in thermostatical oil bath and is heated up, persistently overheating to 95~105 DEG C, it is 95 to keep temperature
~105 DEG C make mixed solution be aged 1~2h, after the completion of reaction, filtration product, and be washed with deionized solid product to get
Hemihydrate calcium sulfate crystal whisker；
(4) drying and dehydrating：Since in hemihydrate calcium sulfate crystal whisker, the abjection of half of crystallization water need to be dehydrated through hydroxyl condensation, tie
Structure the processes such as is reformed and can just be gradated as anhydrous calcium sulfate whisker, calcium sulfate 163 DEG C or so can fully dehydratings, it is therefore dry
Temperature should be higher than 160 DEG C.Be in the present embodiment by the wet product of hemihydrate calcium sulfate crystal whisker insert while hot temperature up to 160 DEG C~
It is dried in 180 DEG C of calcining furnace, and dries 1h at this temperature, stopped heating, discharge after cooling, obtain dead plaster
Whisker.
The preparation method of anhydrous calcium sulfate whisker provided by the invention is given further below in conjunction with specific embodiment
Explanation.The embodiments described below is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
Embodiment 1：
A kind of preparation method of anhydrous calcium sulfate whisker is present embodiments provided, is specifically comprised the following steps：
(1) pretreatment of raw material：Gypsum of the purity more than 90% is crushed and carries out fine grinding, screens out grain size less than 20mm
Gypsum powder.
(2) stock up according to following mass ratio：3000g gypsum powder is weighed, 1000g concentration is 10% sulfuric acid solution,
8g lauryl sodium sulfate, 0.72g alums and 0.08g sodium citrates.
(3) ageing reaction：Gypsum powder is added in into sulfuric acid solution, it is stirring while adding, after being uniformly mixed, filter out
Then filter residue sequentially adds dispersant and crystal modifier into filtrate, and is uniformly mixed, mixed solution is placed in constant temperature oil bath
It heats up in pot, it is persistently overheating up to 100 DEG C, temperature is kept for 100 DEG C mixed solution to be made to be aged 1h, after the completion of reaction, filtering is produced
Object, and solid product is washed with deionized to get hemihydrate calcium sulfate crystal whisker；
(4) drying and dehydrating：The wet product of hemihydrate calcium sulfate crystal whisker is inserted into temperature up to carrying out in 170 DEG C of calcining furnace while hot
It is dry, and 1h is dried at this temperature, stop heating, discharge after cooling, obtain anhydrous calcium sulfate whisker.
A diameter of 0.1~1 μm of the anhydrous calcium sulfate whisker that the present embodiment obtains, draw ratio are 300~350.
Embodiment 2：
A kind of preparation method of anhydrous calcium sulfate whisker is present embodiments provided, is specifically comprised the following steps：
(1) pretreatment of raw material：Gypsum of the purity more than 90% is crushed and carries out fine grinding, screens out grain size less than 20mm
Gypsum powder.
(2) stock up according to following mass ratio：2000g gypsum powder is weighed, 1000g concentration is 15% sulfuric acid solution,
10g lauryl sodium sulfate, 0.2625g alums and 0.0375g sodium citrates.
(3) ageing reaction：Gypsum powder is added in into sulfuric acid solution, it is stirring while adding, after being uniformly mixed, filter out
Then filter residue sequentially adds dispersant and crystal modifier into filtrate, and is uniformly mixed, mixed solution is placed in constant temperature oil bath
It heats up in pot, it is persistently overheating up to 95 DEG C, temperature is kept for 95 DEG C mixed solution to be made to be aged 2h, after the completion of reaction, filtration product,
And solid product is washed with deionized to get hemihydrate calcium sulfate crystal whisker；
(4) drying and dehydrating：The wet product of hemihydrate calcium sulfate crystal whisker is inserted into temperature up to carrying out in 180 DEG C of calcining furnace while hot
It is dry, and 1h is dried at this temperature, stop heating, discharge after cooling, obtain anhydrous calcium sulfate whisker.
A diameter of 0.1~1 μm of the anhydrous calcium sulfate whisker that the present embodiment obtains, draw ratio are 300~350.
Embodiment 3：
A kind of preparation method of anhydrous calcium sulfate whisker is present embodiments provided, is specifically comprised the following steps：
(1) pretreatment of raw material：Gypsum of the purity more than 90% is crushed and carries out fine grinding, screens out grain size less than 20mm
Gypsum powder.
(2) stock up according to following mass ratio：Weigh 2400g gypsum powder, 600g concentration is 20% sulfuric acid solution, 3g
Dodecyl sulphate potassium, 0.32g alums and 0.04g sodium citrates.
(3) ageing reaction：Gypsum powder is added in into sulfuric acid solution, it is stirring while adding, after being uniformly mixed, filter out
Then filter residue sequentially adds dispersant and crystal modifier into filtrate, and is uniformly mixed, mixed solution is placed in constant temperature oil bath
It heats up in pot, it is persistently overheating up to 105 DEG C, temperature is kept for 105 DEG C mixed solution to be made to be aged 1.5h, after the completion of reaction, filtering
Product, and solid product is washed with deionized to get hemihydrate calcium sulfate crystal whisker；
(4) drying and dehydrating：The wet product of hemihydrate calcium sulfate crystal whisker is inserted into temperature up to carrying out in 160 DEG C of calcining furnace while hot
It is dry, and 1h is dried at this temperature, stop heating, discharge after cooling, obtain anhydrous calcium sulfate whisker.
A diameter of 0.1~1 μm of the anhydrous calcium sulfate whisker that the present embodiment obtains, draw ratio are 300~350.
The specific embodiment of present invention described above, is not intended to limit the scope of the present invention..Any basis
The various other corresponding changes and deformation that the technical concept of the present invention is made, should be included in the guarantor of the claims in the present invention
In the range of shield.
Claims (8)
1. a kind of preparation method of anhydrous calcium sulfate whisker, which is characterized in that include the following steps：
S1. excessive gypsum powder is added in sulfuric acid solution and stirred evenly, filtered out filter residue, sequentially added into filtrate
The dispersant of 0.5~1wt% and the crystal modifier of 0.03~0.08wt%, after stirring evenly, by mixed solution temperature for 95~
1~2h is aged at 105 DEG C, after the completion of reaction, product is filtered and is washed, obtain hemihydrate calcium sulfate crystal whisker；
S2. the hemihydrate calcium sulfate crystal whisker in drying steps S1 is to get anhydrous calcium sulfate whisker.
2. the preparation method of anhydrous calcium sulfate whisker according to claim 1, which is characterized in that the dispersant is 12
Sodium alkyl sulfate or dodecyl sulphate potassium.
3. the preparation method of anhydrous calcium sulfate whisker according to claim 1, which is characterized in that the crystal modifier is sulfuric acid
Aluminium potassium and sodium citrate.
4. the preparation method of anhydrous calcium sulfate whisker according to claim 3, which is characterized in that the alum and lemon
The mass ratio of lemon acid sodium is 7~9:1.
5. the preparation method of anhydrous calcium sulfate whisker according to claim 1, which is characterized in that the gypsum powder and
The mass ratio of sulfuric acid solution is 2~4:1.
6. the preparation method of anhydrous calcium sulfate whisker according to claim 1, which is characterized in that the sulfuric acid solution it is dense
It spends for 10%~20%.
7. the preparation method of anhydrous calcium sulfate whisker according to claim 1, which is characterized in that the gypsum powder
Purity is more than 90%, and grain size is less than 20mm.
8. the preparation method of anhydrous calcium sulfate whisker according to claim 1, which is characterized in that dry in the step S2
Dry temperature is 160~180 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711487486.6A CN108085740A (en) | 2017-12-30 | 2017-12-30 | A kind of preparation method of anhydrous calcium sulfate whisker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711487486.6A CN108085740A (en) | 2017-12-30 | 2017-12-30 | A kind of preparation method of anhydrous calcium sulfate whisker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108085740A true CN108085740A (en) | 2018-05-29 |
Family
ID=62181384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711487486.6A Pending CN108085740A (en) | 2017-12-30 | 2017-12-30 | A kind of preparation method of anhydrous calcium sulfate whisker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108085740A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137084A (en) * | 2018-09-10 | 2019-01-04 | 昆明理工大学 | A kind of method of salting out method production Dihydrate gypsum whiskers |
| CN110438568A (en) * | 2019-07-31 | 2019-11-12 | 江苏一夫科技股份有限公司 | A kind of method and system using citric acid gypsum production crystal whisker of gypsum |
| CN114436310A (en) * | 2022-01-28 | 2022-05-06 | 山东祥生新材料科技股份有限公司 | Production process and application of ellipsoidal three-dimensional crystal form calcium sulfate dihydrate |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6451358A (en) * | 1987-08-19 | 1989-02-27 | Asano Slate Co Ltd | Production of anhydrous gypsum board by paper making process |
| CN1598083A (en) * | 2004-08-20 | 2005-03-23 | 东北大学 | Process for preparing calcium sulfate whisker |
| CN101550602A (en) * | 2009-05-19 | 2009-10-07 | 武汉科技大学 | CaSO* crystal whisker with desulfurized gypsum as raw material and preparing method |
| CN102180507A (en) * | 2011-03-24 | 2011-09-14 | 昆明安雅达建材科技有限公司 | Method for preparing high-crystallinity gypsum |
| CN102534773A (en) * | 2012-02-02 | 2012-07-04 | 四川万润非金属矿物材料有限公司 | Production method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers |
| CN103014869A (en) * | 2012-12-28 | 2013-04-03 | 清华大学 | Controllable preparation method of ultrathin anhydrous calcium sulfate crystal whisker with high length-diameter ratio |
| CN104928758A (en) * | 2015-05-13 | 2015-09-23 | 四川理工学院 | Mixed additives and method for producing anhydrous dead-burned type of calcium sulfate whisker |
| CN107286692A (en) * | 2016-04-05 | 2017-10-24 | 武汉理工大学 | A kind of crystal whisker reinforced and toughened plastics of modified gypsum base and preparation method thereof |
-
2017
- 2017-12-30 CN CN201711487486.6A patent/CN108085740A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6451358A (en) * | 1987-08-19 | 1989-02-27 | Asano Slate Co Ltd | Production of anhydrous gypsum board by paper making process |
| CN1598083A (en) * | 2004-08-20 | 2005-03-23 | 东北大学 | Process for preparing calcium sulfate whisker |
| CN101550602A (en) * | 2009-05-19 | 2009-10-07 | 武汉科技大学 | CaSO* crystal whisker with desulfurized gypsum as raw material and preparing method |
| CN102180507A (en) * | 2011-03-24 | 2011-09-14 | 昆明安雅达建材科技有限公司 | Method for preparing high-crystallinity gypsum |
| CN102534773A (en) * | 2012-02-02 | 2012-07-04 | 四川万润非金属矿物材料有限公司 | Production method of high-reinforcement modified anhydrous calcium sulfate crystal whiskers |
| CN103014869A (en) * | 2012-12-28 | 2013-04-03 | 清华大学 | Controllable preparation method of ultrathin anhydrous calcium sulfate crystal whisker with high length-diameter ratio |
| CN104928758A (en) * | 2015-05-13 | 2015-09-23 | 四川理工学院 | Mixed additives and method for producing anhydrous dead-burned type of calcium sulfate whisker |
| CN107286692A (en) * | 2016-04-05 | 2017-10-24 | 武汉理工大学 | A kind of crystal whisker reinforced and toughened plastics of modified gypsum base and preparation method thereof |
Non-Patent Citations (5)
| Title |
|---|
| 孙蓬: "压蒸溶液法脱硫石膏制备α-半水装饰石膏实验研究", 《北京工业大学学报》 * |
| 张巨松等: "转晶剂对脱硫石膏制备α-半水石膏形貌及强度的影响", 《沈阳建筑大学学报(自然科学版)》 * |
| 王宇斌等: "柠檬酸钠对半水硫酸钙晶须形貌的影响", 《化工矿物与加工》 * |
| 胥桂萍: "媒晶剂对制备α-半水石膏的影响", 《能源与环境》 * |
| 郑万荣等: "转晶剂、晶种和分散剂对α半水石膏晶体粒度、形貌的影响", 《非金属矿》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109137084A (en) * | 2018-09-10 | 2019-01-04 | 昆明理工大学 | A kind of method of salting out method production Dihydrate gypsum whiskers |
| CN109137084B (en) * | 2018-09-10 | 2021-06-18 | 昆明理工大学 | Method for producing calcium sulfate dihydrate crystal whisker by salting-out method |
| CN110438568A (en) * | 2019-07-31 | 2019-11-12 | 江苏一夫科技股份有限公司 | A kind of method and system using citric acid gypsum production crystal whisker of gypsum |
| CN110438568B (en) * | 2019-07-31 | 2024-02-27 | 一夫科技股份有限公司 | Method and system for producing gypsum whisker by using citric acid gypsum |
| CN114436310A (en) * | 2022-01-28 | 2022-05-06 | 山东祥生新材料科技股份有限公司 | Production process and application of ellipsoidal three-dimensional crystal form calcium sulfate dihydrate |
| CN114436310B (en) * | 2022-01-28 | 2024-03-12 | 山东祥生新材料科技股份有限公司 | Production process and application of ellipsoidal three-dimensional crystal calcium sulfate dihydrate |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2690358C1 (en) | Method for production of extraction phosphoric acid with obtained as by-product of alpha-hemihydrate gypsum and alpha-semi-aqueous gypsum with high degree of purity and high degree of whiteness | |
| RU2688514C1 (en) | Method of producing phosphoric acid to obtain alpha-hemihydrate gypsum by way of a wet method as a by-product | |
| CN102745923B (en) | A kind of processing method utilizing industry by-product gypsum to produce alpha semi-hydrated gypsum | |
| CN108085740A (en) | A kind of preparation method of anhydrous calcium sulfate whisker | |
| CN104928758B (en) | A kind of additive package and method for producing anhydrous dead roasting type calcium sulfate crystal whiskers | |
| CN101182150A (en) | Industrial crystallization technique for preparing alpha-semi-hydrated gypsum directly by desulfurized gypsum slurry | |
| CN108147447A (en) | A kind of liquid phase method prepares the processing technology of alpha semi-hydrated gypsum | |
| CN104911688B (en) | The preparation method of anhydrous calcium sulfate whisker | |
| CN106866009B (en) | A kind of method that half water ardealite prepares alpha type high-strength gypsum | |
| CN101161685A (en) | Method for preparing surface sizing fecula by synchronous etherification oxidation semi-dry process | |
| CN107190325A (en) | A kind of method that utilization industrial by-product ardealite prepares anhydrous calcium sulfate whisker | |
| CN104261418A (en) | Method for preparing microporus, high-activity and low-density calcium silicate | |
| CN105967201A (en) | Method for producing P-type zeolite from fly ash acid sludge | |
| CN102557719A (en) | Production method of gypsum board | |
| CN105883886A (en) | Method for preparing high-purity alpha-semi-hydrated gypsum powder through salt chemical byproducts | |
| CN103058235B (en) | Method of removing calcium with magnesium sulfate and high-purity magnesium sulfate | |
| CN102797030A (en) | Gypsum whisker preparation method | |
| CN102851739B (en) | Preparation process of calcium sulfate whisker | |
| CN102584053B (en) | Preparation method of desulfurized high-strength alpha-type semi-hydrated gypsum | |
| CN101381209B (en) | Method for transforming desulfating gypsum to alpha-half hydrated gypsum in atmospheric KCl solution | |
| CN102372620A (en) | Preparation method of magnesium stearate with improved specific volume and whiteness | |
| CN111101191A (en) | Method for preparing gypsum whisker by seed crystal method | |
| CN113772709B (en) | Method for preparing anhydrous micron calcium sulfate by using phosphogypsum | |
| CN109112635A (en) | A method of quickly preparing semi-hydrated gypsum whisker and anhydrous gypsum whisker using ardealite | |
| CN104291367B (en) | A kind of production method of magnesium sulfate monohydrate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180529 |
|
| RJ01 | Rejection of invention patent application after publication |