CN107345315A - The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers - Google Patents
The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers Download PDFInfo
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- CN107345315A CN107345315A CN201710551552.5A CN201710551552A CN107345315A CN 107345315 A CN107345315 A CN 107345315A CN 201710551552 A CN201710551552 A CN 201710551552A CN 107345315 A CN107345315 A CN 107345315A
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- Prior art keywords
- desulfurated plaster
- calcium sulfate
- solvent system
- sulfate crystal
- liquid solvent
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- 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
-
- 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
Abstract
The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers includes：By desulfurated plaster raw material at room temperature with [Bmim] [PF6] and the ion liquid solvent systems that form of DMI carry out hybrid extraction heavy metal, grind laggard water-filling thermal response and control system pH through burning after separation, filtering while hot can obtain draw ratio as 100 200:1 calcium sulfate crystal whiskers precursor, the calcium sulfate crystal whiskers of high-quality are obtained by means re-crystallization afterwards.It is an advantage of the invention that：Extraction efficiency can be improved using ion liquid solvent system, effectively remove the heavy metal such as Ni, Cu, Pb in desulfurated plaster；The pH adjusting agent of introducing can promote whisker growth under conditions of guarantee system purity；Ionic liquid renewable use after being concentrated under reduced pressure；In addition equipment needed for the present invention is simple, simple process, and will not cause additional environmental hazard, realizes the recycling of desulfurated plaster discarded object, has extremely far-reaching social effect and economic value.
Description
Technical field
The present invention relates to environmental technology field, especially ion liquid solvent system processing desulfurated plaster production calcium sulfate are brilliant
The method of palpus.
Background technology
With the development of the industrial revolution, caused SO in coal-fired process2Environment is caused seriously to pollute.In order to effectively remove
SO2, have developed now that application is also at most most widely Wet Flue Gas Desulfurization Technique in the world, lime/lime wherein in wet method
Stone-gypsum is in leading position, and desulfurated plaster is exactly to carry out wet method lime/lime stone-gypsum by coal-burning power plant
Desulfurization and it is caused with CaSO4・2H2O is the industrial by-products of main component.
It is a large amount of to stack but desulfurated plaster processing is difficult, these desulfurated plasters no matter purity, compression and tensile strength, aqueous
Rate can not compete with the natural gypsum, it has to take substantial amounts of soil stockpiling and be used as waste disposal.Desulfurated plaster is a large amount of for a long time
Accumulation, the particularly serious polluted surface water of diffusate and underground water, severe shadow particularly is produced to accumulation soil and periphery plant
Ring, more endangered to mankind's health care belt.In addition, discharge SO in be persistently the exposed to the sun decomposition of lower desulfurated plaster of sunlight2Gas causes
Secondary pollution, therefore as handled not in time, desulfurated plaster sequel will turn into the another big dirt after sulfur dioxide, nitrogen oxides
Dye source.Therefore, the innoxious of desulfurated plaster, minimizing and recycling turn into the task of top priority.
However, often containing heavy metal elements such as Ni, Cu, Pb in desulfurated plaster, above-mentioned element is with the resource of desulfurated plaster
Change using being migrated, be present in resource product, have a strong impact on the quality of product.Therefore, in order to improve resource product
Quality, the removal of heavy metal is most important.
Ionic liquid have volatility is low, electrochemical window is wide, electric conductivity is strong, ionic mobility is high, it is easy recovery and
The features such as architectural characteristic is adjustable turns into current study hotspot both domestic and external.Because ionic liquid shows zwitterion at room temperature
Form, with ion-exchange reactions can occur in metal cation contact process, therefore ionic liquid can be used for metal extraction
Field.
Calcium sulfate crystal whiskers are a kind of new needle-like grown with single crystal form, have uniform crosssection, complete profile, inside
Structurally consummate fiber Asia nano material.Because calcium sulfate crystal whiskers have high intensity, high-modulus, high tenacity, high-insulativity, wear-resisting
Consumption, high temperature resistant, acid and alkali-resistance, anticorrosive, infrared reflectivity are good, be easy to surface treatment, easily compound, nontoxic etc. all with polymer
More excellent physicochemical property, available for making in resin, plastics, rubber, coating, paint, papermaking, pitch, friction and encapsulant
Strengthening and toughening agent or functional form filler；Again can be directly as filtering material, insulation material, fire-resistant heat insulating material, infrared reflection
The high insulating materials of material and covered electric cable.Therefore ion liquid solvent system is pre-processed for desulfurated plaster, and then converted
For calcium sulfate crystal whiskers, by pollution of the effective abatement desulfurated plaster to environment, while high value added product is obtained.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide the processing desulfurated plaster life of ion liquid solvent system
The method for producing calcium sulfate crystal whiskers, by the pretreatment of ion liquid solvent system, hydro-thermal process, recrystallization technology, is effectively increased
The purity and production efficiency of calcium sulfate crystal whiskers, realize discarded object cycling and reutilization, economize the land resource, and eliminate environment and health is hidden
Suffer from.
Technical scheme：
The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers comprises the following steps：
1）10g desulfurated plasters are mixed and continuously stirred with 1L water, speed of agitator 150-200rpm, mixing time is
20-30min, stirring terminate to form desulfurated plaster turbid solution I；
2）Above-mentioned turbid solution and ion liquid solvent system are pressed into 1500-3000:1, it is mixed and stirred at ambient temperature
Extraction（Rotating speed is 100-150rpm）, utilize dilute sulfuric acid regulation system pH=3-5, extraction time 30-70min；
3）Above-mentioned solution is filtered and washes 3 times and obtains ion liquid solvent system extract solution, the aqueous solution and residual solid,
Residual solid 10g is mixed and continuously stirred with 1L water, speed of agitator 150-200rpm, mixing time 20-
30min, stirring terminate to form desulfurated plaster turbid solution II；
4）Above-mentioned turbid solution and ion liquid solvent system are pressed into 1500-3000:1, it is mixed and stirred at ambient temperature
Extraction（Rotating speed is 100-150rpm）, utilize dilute sulfuric acid regulation system pH=5-7, extraction time 40-100min；
5）Above-mentioned solution is filtered and washes 3 times and obtains ion liquid solvent system extract solution, the aqueous solution and residual solid,
Residual solid is placed in Muffle furnace and burns 3h in 300-350 DEG C, is taken out standby；
6）Above-mentioned pretreated desulfurated plaster is ground to 100-200 mesh；
7）The pretreated desulfurated plaster raw material input reactors of 10g are reacted, while add 300-400ml distilled water；
8）120-140 DEG C, maintenance reaction time 4h is increased to according to 4-7 DEG C/min heating rates, while passes through 200 mesh particle diameters
Ca(OH)2Solid carrys out regulation system pH=6.5-7.5；
9）Reaction is depressurized to atmospheric pressure state naturally after terminating（1atm）, draw ratio can be obtained by, which being filtered while hot at 80-100 DEG C, is
100-200:1 calcium sulfate crystal whiskers precursor；
10）0.1-0.5g CaSO are added into filtrate4·0.5H2O, fast cooling is to 50-55 under the stirring of 10-50rpm rotating speeds
DEG C, the temperature filtration after no longer precipitation is produced, filter residue is that draw ratio is 100-200:1 calcium sulfate crystal whiskers.
Described ion liquid solvent system is by [Bmim] [PF6]（1- butyl -3- methylimidazole hexafluorophosphates）From
Sub- liquid presses 10 with DMI solvents:1 mixed after form；
Described ion liquid solvent system extract solution presses 1 with deionized water:Ion liquid solvent system water is obtained after 10 mixing
After solution and heavy metal precipitation are separated by filtration, it is concentrated under reduced pressure into that there is no liquid to the ion liquid solvent system aqueous solution
Evaporation can obtain ion liquid solvent system, can be recycled, realize the regeneration of ion liquid solvent system.
The advantages of the present invention are：
The present invention is pre-processed using ion liquid solvent system to the heavy metal in desulfurated plaster raw material, can will be residual in raw material
Ni, Cu, the Pb deposited is efficiently extracted, and improves the purity of desulfurated plaster；Ion liquid solvent system has to be flowed at room temperature
Property is good, can be recycled after separating-purifying regenerates, production cost is greatly reduced, at the same time effectively can remove in desulfurated plaster
The content of the heavy metals such as Ni, Cu, Pb is up to more than 70%；Utilize Ca (OH)2Solid carrys out the pH of regulation system, not only in increase system
Ca2+Concentration, is advantageous to the growth of whisker, and does not introduce foreign ion, ensure that system purity.
Equipment is simple needed for the present invention, simple process, and will not cause additional environmental hazard, realizes desulfurated plaster and gives up
The recycling of gurry, solve pollution problem of the desulfurated plaster to environment, while calcium sulfate crystal whiskers produced by the invention have
There is the features such as size uniform, cost are low, added value is high, there is extremely far-reaching social effect and economic value.
Embodiment
The present invention is described in further detail by following examples, but the technology contents that are described of the present embodiment be it is illustrative,
Rather than it is limited, protection scope of the present invention should not be limited to according to this.
Embodiment 1：
The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers comprises the following steps：
1）10g desulfurated plasters are mixed and continuously stirred with 1L deionized waters, speed of agitator 150rpm, mixing time is
30min, stirring terminate to form desulfurated plaster turbid solution I；
2）Above-mentioned turbid solution and ion liquid solvent system are pressed 2800:1, carry out being mixed and stirred for extracting at ambient temperature
（Rotating speed is 100rpm）, utilize dilute sulfuric acid regulation system pH=3, extraction time 30min；
3）Above-mentioned solution is filtered and washes 3 times and obtains ion liquid solvent system extract solution, the aqueous solution and residual solid,
Residual solid 10g is mixed and continuously stirred with 1L deionizations, speed of agitator 150rpm, mixing time 30min, is stirred
Mix end and form desulfurated plaster turbid solution II；
4）Above-mentioned turbid solution and ion liquid solvent system are pressed 2800:1, carry out being mixed and stirred for extracting at ambient temperature
（Rotating speed is 100rpm）, utilize dilute sulfuric acid regulation system pH=5, extraction time 30min；
5）Above-mentioned solution is filtered and washes 3 times and obtains ionic liquid extract liquid, the aqueous solution and residual solid, remnants are solid
Body is placed in Muffle furnace burns 3h in 300 DEG C, takes out standby；
6）Above-mentioned pretreated desulfurated plaster is ground to 100 mesh；
7）The pretreated desulfurated plaster raw material input reactors of 10g are reacted, while add 300ml distilled water；
8）125 DEG C, maintenance reaction time 4h are increased to according to 5 DEG C/min heating rates, while passes through the Ca of 200 mesh particle diameters
(OH)2Solid comes regulation system pH=6.5；
9）Reaction is depressurized to atmospheric pressure state naturally after terminating（1atm）, it is 100 that filtering while hot, which can obtain draw ratio, at 80 DEG C:1
Calcium sulfate crystal whiskers precursor；
10）0.1g CaSO are added into filtrate4·0.5H2O, fast cooling is treated no longer to 50 DEG C under the stirring of 25rpm rotating speeds
Temperature filtration after precipitating is produced, filter residue is that draw ratio is 110:1 calcium sulfate crystal whiskers.
Above-mentioned ionic liquid extract liquid and deionized water are pressed 1:Ionic liquid aqueous solution and heavy metal are obtained after 10 mixing
After precipitation is separated by filtration, it is concentrated under reduced pressure into that there is no liquid evaporation can obtain ionic liquid to ionic liquid aqueous solution
It body, can be recycled, realize the regeneration of ionic liquid.
The clearance that Ni clearance is 80%, Cu in desulfurated plaster after ionic liquid pretreatment is going for 95%, Pb
Except rate is 70%.
Embodiment 2：
The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers comprises the following steps：
1）10g desulfurated plasters are mixed and continuously stirred with 1L water, speed of agitator 180rpm, mixing time 25min,
Stirring terminates to form desulfurated plaster turbid solution I；
2）Above-mentioned turbid solution and ion liquid solvent system are pressed 2000:1, carry out being mixed and stirred for extracting at ambient temperature
（Rotating speed is 130rpm）, utilize dilute sulfuric acid regulation system pH=4.5, extraction time 50min；
3）Above-mentioned solution is filtered and washes 3 times and obtains ionic liquid extract liquid, the aqueous solution and residual solid, remnants are solid
Body 10g is mixed and continuously stirred with 1L water, speed of agitator 180rpm, mixing time 25min, and stirring, which terminates to form, to be taken off
Sulphur gypsum turbid solution II；
4）Above-mentioned turbid solution and ion liquid solvent system are pressed 2000:1, carry out being mixed and stirred for extracting at ambient temperature
（Rotating speed is 130rpm）, utilize dilute sulfuric acid regulation system pH=5.5, extraction time 100min；
5）Above-mentioned solution is filtered and washes 3 times and obtains ionic liquid extract liquid, the aqueous solution and residual solid, remnants are solid
Body is placed in Muffle furnace burns 3h in 350 DEG C, takes out standby；
6）Above-mentioned pretreated desulfurated plaster is ground to 200 mesh；
7）The pretreated desulfurated plaster raw material input reactors of 10g are reacted, while add 400ml distilled water；
8）130 DEG C, maintenance reaction time 4h are increased to according to 6 DEG C/min heating rates, while passes through the Ca of 200 mesh particle diameters
(OH)2Solid comes regulation system pH=7.1；
9）Reaction is depressurized to atmospheric pressure state naturally after terminating（1atm）, it is 180 that filtering while hot, which can obtain draw ratio, at 95 DEG C:1
Calcium sulfate crystal whiskers precursor；
10）0.3g CaSO are added into filtrate4·0.5H2O, fast cooling is treated not to 50 DEG C under the stirring of 10-50rpm rotating speeds
Temperature filtration after precipitating is produced again, and filter residue is that draw ratio is 180:1 calcium sulfate crystal whiskers.
Above-mentioned ionic liquid extract liquid and deionized water are pressed 1:Ionic liquid aqueous solution and heavy metal are obtained after 10 mixing
After precipitation is separated by filtration, it is concentrated under reduced pressure into that there is no liquid evaporation can obtain ionic liquid to ionic liquid aqueous solution
It body, can be recycled, realize the regeneration of ionic liquid.
The clearance that Ni clearance is 98%, Cu in desulfurated plaster after ionic liquid pretreatment is going for 100%, Pb
Except rate is 85%.
Embodiment 3：
The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers comprises the following steps：
1）10g desulfurated plasters are mixed and continuously stirred with 1L water, speed of agitator 200rpm, mixing time 30min,
Stirring terminates to form desulfurated plaster turbid solution I；
2）Above-mentioned turbid solution and ion liquid solvent system are pressed 1500:1, carry out being mixed and stirred for extracting at ambient temperature
（Rotating speed is 150rpm）, utilize dilute sulfuric acid regulation system pH=5, extraction time 60min；
3）Above-mentioned solution is filtered and washes 3 times and obtains ionic liquid extract liquid, the aqueous solution and residual solid, remnants are solid
Body 10g is mixed and continuously stirred with 1L water, speed of agitator 200rpm, mixing time 30min, and stirring, which terminates to form, to be taken off
Sulphur gypsum turbid solution II；
4）Above-mentioned turbid solution and ion liquid solvent system are pressed 1500:1, carry out being mixed and stirred for extracting at ambient temperature
（Rotating speed is 150rpm）, utilize dilute sulfuric acid regulation system pH=7, extraction time 50min；
5）Above-mentioned solution is filtered and washes 3 times and obtains ionic liquid extract liquid, the aqueous solution and residual solid, remnants are solid
Body is placed in Muffle furnace burns 3h in 350 DEG C, takes out standby；
6）Above-mentioned pretreated desulfurated plaster is ground to 150 mesh；
7）The pretreated desulfurated plaster raw material input reactors of 10g are reacted, while add 400ml distilled water；
8）140 DEG C, maintenance reaction time 4h are increased to according to 7 DEG C/min heating rates, while passes through the Ca of 200 mesh particle diameters
(OH)2Solid comes regulation system pH=7.4；
9）Reaction is depressurized to atmospheric pressure state naturally after terminating（1atm）, it is 170 that filtering while hot, which can obtain draw ratio, at 100 DEG C:1
Calcium sulfate crystal whiskers precursor；
10）0.5g CaSO are added into filtrate4·0.5H2O, fast cooling is treated no longer to 55 DEG C under the stirring of 50rpm rotating speeds
Temperature filtration after precipitating is produced, filter residue is that draw ratio is 160:1 calcium sulfate crystal whiskers.
Above-mentioned ionic liquid extract liquid and deionized water are pressed 1:Ionic liquid aqueous solution and heavy metal are obtained after 10 mixing
After precipitation is separated by filtration, it is concentrated under reduced pressure into that there is no liquid evaporation can obtain ionic liquid to ionic liquid aqueous solution
It body, can be recycled, realize the regeneration of ionic liquid.
The clearance that Ni clearance is 90%, Cu in desulfurated plaster after ionic liquid pretreatment is going for 100%, Pb
Except rate is 80%.
Claims (3)
1. the method for ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers comprises the following steps：
1）10g desulfurated plasters are mixed and continuously stirred with 1L water, speed of agitator 150-200rpm, mixing time is
20-30min, stirring terminate to form desulfurated plaster turbid solution I；
2）Above-mentioned turbid solution and ion liquid solvent system are pressed into 1500-3000:1, it is mixed and stirred at ambient temperature
Extraction（Rotating speed is 100-150rpm）, utilize dilute sulfuric acid regulation system pH=3-5, extraction time 30-70min；
3）Above-mentioned solution is filtered and washes 3 times and obtains ion liquid solvent system extract solution, the aqueous solution and residual solid,
Residual solid 10g is mixed and continuously stirred with 1L water, speed of agitator 150-200rpm, mixing time 20-
30min, stirring terminate to form desulfurated plaster turbid solution II；
4）Above-mentioned turbid solution and ion liquid solvent system are pressed into 1500-3000:1, it is mixed and stirred at ambient temperature
Extraction（Rotating speed is 100-150rpm）, utilize dilute sulfuric acid regulation system pH=5-7, extraction time 40-100min；
5）Above-mentioned solution is filtered and washes 3 times and obtains ion liquid solvent system extract solution, the aqueous solution and residual solid,
Residual solid is placed in Muffle furnace and burns 3h in 300-350 DEG C, is taken out standby；
6）Above-mentioned pretreated desulfurated plaster is ground to 100-200 mesh；
7）The pretreated desulfurated plaster raw material input reactors of 10g are reacted, while add 300-400ml distilled water；
8）120-140 DEG C, maintenance reaction time 4h is increased to according to 4-7 DEG C/min heating rates, while passes through 200 mesh particle diameters
Ca(OH)2Solid carrys out regulation system pH=6.5-7.5；
9）Reaction is depressurized to atmospheric pressure state naturally after terminating（1atm）, draw ratio can be obtained by, which being filtered while hot at 80-100 DEG C, is
100-200:1 calcium sulfate crystal whiskers precursor；
10）0.1-0.5g CaSO are added into filtrate4·0.5H2O, fast cooling is to 50-55 under the stirring of 10-50rpm rotating speeds
DEG C, the temperature filtration after no longer precipitation is produced, filter residue is that draw ratio is 100-200:1 calcium sulfate crystal whiskers.
2. the method for ionic liquid pretreatment desulfurated plaster production calcium sulfate crystal whiskers according to claim 1, it is characterized in that：
Described ion liquid solvent system is by [Bmim] [PF6]（1- butyl -3- methylimidazole hexafluorophosphates）Ionic liquid with
DMI solvents press 10:1 mixed after form.
3. the method for ionic liquid pretreatment desulfurated plaster production calcium sulfate crystal whiskers according to claim 1, it is characterized in that：
Ionic liquid extract liquid presses 1 with deionized water:Ionic liquid aqueous solution is obtained after 10 mixing and heavy metal precipitation is separated by filtration
Afterwards, it is concentrated under reduced pressure into that there is no liquid evaporation can obtain ionic liquid to ionic liquid aqueous solution, is can be recycled, it is real
The regeneration of ionic liquid is showed.
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| CN201710551552.5A CN107345315A (en) | 2017-07-07 | 2017-07-07 | The method of ion liquid solvent system processing desulfurated plaster production calcium sulfate crystal whiskers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779604A (en) * | 2021-01-20 | 2021-05-11 | 广西大学 | Process for preparing high-purity calcium sulfate whiskers from iron phosphate production wastewater |
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|---|---|---|---|---|
| CN101311337A (en) * | 2008-04-25 | 2008-11-26 | 东北大学 | Process for preparing calcium sulphate whiskers by using flue gas desulfurization gypsum |
| CN104651944A (en) * | 2015-02-12 | 2015-05-27 | 湘潭大学 | Preparation method of calcium-sulfate-based calcium sulfate crystal whisker |
| CN107140671A (en) * | 2017-07-12 | 2017-09-08 | 雅安晶玉新材料有限公司 | A kind of nano-calcium carbonate powder and preparation method thereof |
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2017
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|---|---|---|---|---|
| CN101311337A (en) * | 2008-04-25 | 2008-11-26 | 东北大学 | Process for preparing calcium sulphate whiskers by using flue gas desulfurization gypsum |
| CN104651944A (en) * | 2015-02-12 | 2015-05-27 | 湘潭大学 | Preparation method of calcium-sulfate-based calcium sulfate crystal whisker |
| CN107140671A (en) * | 2017-07-12 | 2017-09-08 | 雅安晶玉新材料有限公司 | A kind of nano-calcium carbonate powder and preparation method thereof |
Non-Patent Citations (1)
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| 李长平等: "离子液体对Cu(Ⅱ)和Ni(Ⅱ)的萃取性能", 《大连海事大学学报》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112779604A (en) * | 2021-01-20 | 2021-05-11 | 广西大学 | Process for preparing high-purity calcium sulfate whiskers from iron phosphate production wastewater |
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Application publication date: 20171114 |