CN109706526A - It is a kind of to prepare Dihydrate gypsum whiskers, the method for hemihydrate calcium sulfate crystal whisker and product as made from it - Google Patents
It is a kind of to prepare Dihydrate gypsum whiskers, the method for hemihydrate calcium sulfate crystal whisker and product as made from it Download PDFInfo
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Abstract
Dihydrate gypsum whiskers, the method for hemihydrate calcium sulfate crystal whisker and product as made from it are prepared the present invention relates to a kind of.The method for preparing Dihydrate gypsum whiskers are as follows: using semi-hydrated gypsum or III type anhydrous gypsum as raw material, place it in inorganic strong acid solution and mix, carry out aquation crystallization, obtain the Dihydrate gypsum whiskers.The method for preparing hemihydrate calcium sulfate crystal whisker are as follows: by the Dihydrate gypsum whiskers by heating to obtain the final product.The raw material sources of the preparation method are extensive, it is at low cost, reaction just can be carried out at room temperature, reaction time is shorter, it overcomes and prepares calcium sulfate crystal whiskers and generally occur within the problems such as energy consumption is high, low efficiency, and the whisker morphology being prepared is completely uniform, the performance parameters such as draw ratio are greatly optimized, whole preparation process is easy to operate, environmentally protective.
Description
Technical field
The invention belongs to crystal whisker of gypsum preparation technical field, has and be related to a kind of preparing Dihydrate gypsum whiskers, half water sulphur
The method of sour calcium pyroborate and product as made from it.
Background technique
Crystal whisker of gypsum is a kind of inorganic fibrous crystal of preferential growth in the axial direction, it have uniform cross-sectional area,
Complete shape, perfect internal structure have high temperature resistant, intensity height, good toughness, resist chemical, are easy to carry out at surface
The advantages that polymer affinity such as reason and rubber plastic is strong, frequently as additive application in the industries such as plastics, rubber, papermaking.
By taking paper industry as an example, when crystal whisker of gypsum draw ratio >=50 can replace partially or mostly paper pulp as manufacturing extraordinary gypsum
Paper, when draw ratio≤50, can be used as the advanced filler of paper, and furthermore the introducing of crystal whisker of gypsum is expected to reduce lumber consumption and waste
Discharge, while the performances such as Paper White Degree, intensity, folding strength can be effectively improved.Compared with pearl filler, calcium sulfate crystal whiskers filler
Intensity is big, high brightness, high bulk, the high grade of transparency, at low cost, and source is more extensive.While a large amount of industry by-product gypsum is often
It is handled using land stacking He Jiang, lake, extra large land-fill method, not only appropriation of land, pollution environment, also result in the pole of resource
Big waste, therefore be meaningful with the crystal whisker of gypsum of industry by-product gypsum production high-performance, high added value.
CN1314840C discloses a kind of method that crystal whisker of gypsum is manufactured in phosphoric acid, prepares phosphoric acid leaching liquid: using
The concentration of amount is that the phosphoric acid of 30-40% and phosphorus ore carry out leaching chemical reaction, controlled at 50-95 DEG C, by the anti-of 2-4h
It answers, separate liquid phase and is filtered, obtain phosphoric acid leaching liquid；It prepares crystal whisker of gypsum suspension: phosphoric acid leaching liquid is gradually added into
Concentration is to be stirred to react 120-150min under conditions of 50-100 DEG C in the sulfuric acid solution of 30-35%；Prepare half water or anhydrous
Crystal whisker of gypsum: after the filtering of above-mentioned crystal whisker of gypsum suspension, being washed with boiling water, in 120-200 DEG C of at a temperature of drying.But the party
The crystal whisker of gypsum of method preparation is semi-hydrated gypsum whisker, and is needed with high-concentration phosphoric acid and sulfuric acid and in higher temperature, long-time
It could be completed under the conditions of reaction etc..
CN103074667B discloses a kind of method that recrystallization prepares calcium sulfate crystal whiskers: (1) being sulfuric acid by main component
It is stirred in the raw material investment sulfuric acid solution of calcium, uses process control that mixture is warming up to 60-95 DEG C with given pace and dissolve
20min-1h；(2) will dissolve resulting suspension uses process control to be cooled to 10-30 DEG C with given pace, and is aged
20min-2h；(3) suspension is separated by solid-liquid separation, solid product is washed；(4) solid product is done at a certain temperature
It is dry to get arrive Dihydrate gypsum whiskers.This method is molten in high-temperature concentrated sulfuric acid solution and the low temperature concentrated sulfuric acid using calcium sulphate dihydrate
The difference (solubility of gypsum has a degree of increase when high temperature) of solubility in liquid prepares dihydrate gypsum whisker, not only
Working condition is harsh, production efficiency is very low (difference of the solubility of gypsum is smaller in high/low temperature sulfuric acid solution), two water of production
The diameter of crystal whisker of gypsum is bigger than normal, and draw ratio is not also high.
CN101311355B discloses a kind of method of preparing calcium sulphate whiskers from ardealite, is former with solid slag ardealite
Material, hydro-thermal reaction is carried out at 100-200 DEG C, is prepared through synthetic reaction, filtering, heating for dissolving, heat filtering and crystallisation by cooling
Diameter of whiskers is 1-4 μm, 50-200 μm of length, diameter and the controllable hemihydrate calcium sulfate crystal whisker product of length.The method is also required to
Very high temperature could be completed, and technique is cumbersome.
To sum up, about the prior art for preparing calcium sulfate crystal whiskers, there is also many deficiencies, therefore, develop one kind mild
Under the conditions of, it is meaningful for simply and rapidly preparing the calcium sulfate crystal whiskers that diameter is small, draw ratio is big.
Summary of the invention
In view of the deficiencies of the prior art, Dihydrate gypsum whiskers, half water sulphur are prepared the purpose of the present invention is to provide a kind of
The method of sour calcium pyroborate and product as made from it.
In order to achieve that object of the invention, the invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of method for preparing Dihydrate gypsum whiskers, the method are as follows: with semi-hydrated gypsum
Or III type anhydrous gypsum be raw material, place it in inorganic strong acid solution and mix, carry out aquation crystallization, obtain the sulfate dihydrate
Calcium pyroborate.
The present invention at normal temperatures and pressures, using semi-hydrated gypsum or III type anhydrous gypsum in aqueous solution with the spontaneous generation water of water
Change reaction to generate containing the characteristics of there are two the calcium sulfate of the crystallization water, by adding inorganic acid in the solution, the hydrogen for providing it
Ion selectivity is adsorbed in the side (120,010) of long column shape or needle-shaped calcium sulphate dihydrate crystal face, is adsorbed with hydrogen ion side
Crystal growth rate is substantially less than the crystal growth rate without hydrogen ion adsorption side, therefore can control the life of calcium sulphate dihydrate
Length direction makes it be oriented one-dimensional growth and ultimately generates the high Dihydrate gypsum whiskers of draw ratio.
The method of the present invention for preparing Dihydrate gypsum whiskers uses semi-hydrated gypsum or III type anhydrous gypsum for raw material,
Raw material sources are extensive, at low cost；Fast hydration crystallizes into whisker under the action of a certain concentration hydrogen ion, makes reaction at room temperature
It just can be carried out, also substantially reduce the reaction time, overcome and prepare calcium sulfate crystal whiskers and generally occur within that energy consumption is high, low efficiency etc. is asked
Topic；And the whisker morphology being prepared is completely uniform, the performance parameters such as draw ratio are greatly optimized, and draw ratio maximum can reach 120；
Whole simple in production process operation, it is environmentally protective.
Preferably, the inorganic acid includes in sulfuric acid, nitric acid, phosphoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid or perchloric acid
Any one or at least two combination, described at least two combination such as sulfuric acid and hydrochloric acid combination, hydrobromic acid and hydrogen iodine
Combination, hydrobromic acid and the hydroiodic acid of acid and the combination of perchloric acid etc..
Preferably, the inorganic acid is sulfuric acid.
Preferably, hydrionic molar concentration is not less than 0.0001mol/L in the inorganic strong acid solution, such as
0.0001mol/L, 0.0005mol/L, 0.001mol/L, 0.005mol/L, 0.05mol/L or 0.1mol/L etc..
The inorganic strong acid solution is the aqueous solution of inorganic acid.
Preferably, the additive amount of the semi-hydrated gypsum or III type anhydrous gypsum be solution quality 1-30%, such as 1%,
5%, 10%, 15%, 20%, 25%, 28% or 30% etc..
Preferably, the semi-hydrated gypsum includes α phase semi-hydrated gypsum and/or β phase semi-hydrated gypsum.
Preferably, the raw material for preparing of the semi-hydrated gypsum includes industry by-product gypsum and/or the natural gypsum.
The industry by-product gypsum refers to the byproduct rock based on calcium sulphate dihydrate by generating in industrial manufacturing process
Cream, including desulfurized gypsum, citric acid gypsum, ardealite, titanium gypsum, fluorgypsum, bunt gypsum, nitre sulfenyl gypsum or lactic acid gypsum
Deng.
It preferably, further include that organic additive is added in mixed system after the mixing.
Preferably, the organic additive includes methanol, ethyl alcohol, ethylene glycol, propyl alcohol, propylene glycol, glycerine, butanediol, fourth
In triol or pentanediol any one or at least two combination, described at least two combination such as glycerine and methanol
Combination, combination, butanediol and the butantriol of ethyl alcohol and propyl alcohol and the combination of pentanediol etc..
Preferably, mass percentage of the organic additive in mixed system be 1-90%, such as 1%, 5%,
10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80% or 90% etc., preferably 1-40%.
The specific selection of mass percentage of the organic additive in mixed system is less than this model within the scope of 1-90%
Meeting is enclosed so that effect reduction of the organic additive to reducing diameter of whiskers, improving whisker draw ratio, can to prepare more than this range
Whisker in cost increase, suspension is difficult to be separated by solid-liquid separation, and optimal effect can be obtained within the scope of 1-40%.
Organic additive is added in mixed system can be substantially reduced the activity of water, increase semi-hydrated gypsum or the anhydrous stone of III type
Cream improves two to finally reduce the diameter of Dihydrate gypsum whiskers significantly in the degree of supersaturation of aquation calcium sulphate dihydrate
The draw ratio of H 2 O calcium sulphate whisker.
It preferably, further include that crystal seed is added in mixed system after the mixing.
Preferably, the additive amount of the crystal seed be material quality 0.1-10%, such as 0.1%, 0.5%, 1%, 2%,
3%, 5%, 6%, 7%, 8% or 10% etc..
The specific 0.1-10% for being selected as material quality of the additive amount of the crystal seed is more than this quality or is less than this quality all
It can make the declines of crystal seed.
Crystal seed is added in mixed system can reduce the nucleation quantity of calcium sulphate dihydrate crystal in solution, increase by two water sulphur
The draw ratio of sour calcium pyroborate.
Preferably, it is described obtain Dihydrate gypsum whiskers after it is post-processed, the operation of the post-processing are as follows: adjust
It is separated by solid-liquid separation after the pH value to 6-8 of solution, isolated solid is washed, it is dry.
Preferably, the method for the pH value for adjusting solution is to be carried out in soda acid with calcium carbonate, calcium hydroxide or calcium oxide
With.
Preferably, the temperature of the drying is 40-150 DEG C, such as 40 DEG C, 50 DEG C, 60 DEG C, 70 DEG C, 150 DEG C, 80 DEG C, 90
DEG C, 100 DEG C, 120 DEG C, 140 DEG C or 150 DEG C etc..
Preferably, the time of the drying is 1-3h, such as 1h, 1.5h, 2h, 2.5h or 3h etc..
Preferably, it is described carry out aquation crystallization when temperature be 0-100 DEG C, such as 0 DEG C, 10 DEG C, 20 DEG C, 30 DEG C, 40 DEG C,
50 DEG C, 60 DEG C, 70 DEG C, 80 DEG C, 90 DEG C or 100 DEG C etc..
Aquation crystallization process of the present invention arbitrarily can select temperature in the range of 0-100 DEG C according to the actual situation.
Preferably, it is described carry out aquation crystallization duration be not less than 10min, such as 10min, 20min, 30min,
50min, 60min, 80min, 100min, 120min or 150min etc..
Preferably, it is stirred while the progress aquation crystallization with blender.
Preferably, the revolving speed of the blender be 60-600r/min, such as 100r/min, 150r/min, 200r/min,
250r/min, 300r/min, 350r/min, 400r/min, 450r/min, 500r/min, 550r/min or 600r/min etc..
As the preferred technical solution of the present invention, as method specifically comprise the following steps: with semi-hydrated gypsum or III type without
Water gypsum is raw material, places it in inorganic strong acid solution of the hydrogen ion molar concentration not less than 0.0001mol/L and mixes, in 0-
Aquation crystallization is carried out at 100 DEG C, while being stirred with blender, and the duration is not less than 10min；Carbonic acid is added into solution
Calcium, calcium hydroxide or calcium oxide carry out acid-base neutralization, are separated by solid-liquid separation after adjusting the pH value to 6-8 of solution, to isolated
Solid washed, it is dry, obtain the Dihydrate gypsum whiskers.
Second aspect, the present invention provide a kind of Dihydrate gypsum whiskers being prepared using method as described above.
The third aspect, the present invention provide a kind of method for preparing hemihydrate calcium sulfate crystal whisker, the method are as follows: will be as described above
Dihydrate gypsum whiskers calcined, obtain the hemihydrate calcium sulfate crystal whisker, calcination temperature is higher than 100 DEG C.
Fourth aspect, the present invention provide a kind of hemihydrate calcium sulfate crystal whisker being prepared using method as described above.
Compared with the existing technology, the invention has the following advantages:
The method of the present invention for preparing Dihydrate gypsum whiskers uses semi-hydrated gypsum or III type anhydrous gypsum for raw material,
Raw material sources are extensive, at low cost；Fast hydration crystallizes into whisker under the action of a certain concentration hydrogen ion, makes reaction at room temperature
It just can be carried out, also substantially reduce the reaction time, overcome and prepare calcium sulfate crystal whiskers and generally occur within that energy consumption is high, low efficiency etc. is asked
Topic；And the whisker morphology being prepared is completely uniform, the performance parameters such as draw ratio are greatly optimized, and draw ratio maximum can reach 120；
Whole simple in production process operation, it is environmentally protective.
Detailed description of the invention
Fig. 1 is 200 times of optical microscope images of the raw materials used desulfurization beta-type semi-hydrated gypsum of embodiment 1；
Fig. 2 is the XRD diffracting spectrum of Dihydrate gypsum whiskers made from embodiment 1；
Fig. 3 is 200 times of optical microscope images of Dihydrate gypsum whiskers made from embodiment 1；
Fig. 4 is 200 times of optical microscope images of Dihydrate gypsum whiskers made from comparative example 1.
Specific embodiment
The technical scheme of the invention is further explained by means of specific implementation.Those skilled in the art should be bright
, the described embodiments are merely helpful in understanding the present invention, should not be regarded as a specific limitation of the invention.
Embodiment 1
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
Desulfurization β phase semi-hydrated gypsum is mixed with the aqueous sulfuric acid that hydrogen ion concentration is 0.0001mol/L, at 40 DEG C
Lower progress aquation crystallization, duration 30min；Backward solution in be added calcium carbonate carry out acid-base neutralization, adjust solution
PH value washs isolated solid with water to being separated by solid-liquid separation after 7, and dry 2h, obtains described two at 100 DEG C
H 2 O calcium sulphate whisker.
The average length of gained Dihydrate gypsum whiskers is 120 μm, and average diameter is 3 μm, average aspect ratio 35.
Desulfurization of raw material beta-type semi-hydrated gypsum is observed under 200 times of optical microscopies, as shown in Figure 1.
XRD diffraction analysis is carried out to Dihydrate gypsum whiskers obtained, analyzes result as shown in Fig. 2, by that can see in figure
Out: semi-hydrated gypsum all becomes dihydrate gypsum whisker after aquation in an acidic solution.
Dihydrate gypsum whiskers obtained are observed under 200 times of optical microscopies, as shown in figure 3, by can in figure
To find out: the present embodiment has successfully prepared acicular dihydrate gypsum whisker and draw ratio is very high.
Embodiment 2
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
The aqueous solution of nitric acid that III type anhydrous gypsum and hydrogen ion concentration are 0.001mol/L is mixed, at 10 DEG C into
The crystallization of row aquation, duration 120min；Backward solution in be added calcium oxide carry out acid-base neutralization, adjust the pH value of solution
It is separated by solid-liquid separation after to 6, isolated solid is washed with water, dry 3h, obtains the two water sulphur at 40 DEG C
Sour calcium pyroborate.
The average length of gained Dihydrate gypsum whiskers is 170 μm, and average diameter is 2.0 μm, average aspect ratio 67.
Embodiment 3
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
Desulfurization alpha semi-hydrated gypsum is mixed with the aqueous hydrochloric acid solution that hydrogen ion concentration is 0.001mol/L, at 60 DEG C
Lower progress aquation crystallization, duration 30min；Backward solution in be added calcium hydroxide carry out acid-base neutralization, adjust solution
PH value to being separated by solid-liquid separation after 8, isolated solid is washed with water, the dry 1h at 140 DEG C is obtained described
Dihydrate gypsum whiskers.
The average length of gained Dihydrate gypsum whiskers is 160 μm, and average diameter is 1.8 μm, average aspect ratio 71.
Embodiment 4
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
Desulfurization β phase semi-hydrated gypsum is mixed with the aqueous sulfuric acid that hydrogen ion concentration is 0.0001mol/L, at 90 DEG C
Lower progress aquation crystallization, duration 10min；Backward solution in be added calcium carbonate carry out acid-base neutralization, adjust solution
PH value washs isolated solid with water to being separated by solid-liquid separation after 7, and dry 2h, obtains described two at 100 DEG C
H 2 O calcium sulphate whisker.
The average length of gained Dihydrate gypsum whiskers is 200 μm, and average diameter is 3 μm, average aspect ratio 58.
Embodiment 5
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
Desulfurization β phase semi-hydrated gypsum is mixed with the aqueous sulfuric acid that hydrogen ion concentration is 0.0001mol/L, is being mixed
The glycerine that mass percentage is 15% is added in system, aquation crystallization, duration 30min are carried out at 40 DEG C；It
Calcium carbonate is added in backward solution and carries out acid-base neutralization, adjusts the pH value of solution to being separated by solid-liquid separation after 7, to isolated
Solid is washed with water, and dry 2h, obtains the Dihydrate gypsum whiskers at 100 DEG C.
The average length of gained Dihydrate gypsum whiskers is 140 μm, and average diameter is 1.2 μm, average aspect ratio 105.
Embodiment 6
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
Desulfurization β phase semi-hydrated gypsum is mixed with the aqueous sulfuric acid that hydrogen ion concentration is 0.0001mol/L, is being mixed
Be added in system and account for the Dihydrate gypsum whiskers being made by embodiment 1 of desulfurization β phase semi-hydrated gypsum quality 2%, at 40 DEG C into
The crystallization of row aquation, duration 30min；Backward solution in be added calcium carbonate carry out acid-base neutralization, adjust the pH value of solution
It is separated by solid-liquid separation after to 7, isolated solid is washed with water, dry 2h, obtains the two water sulphur at 100 DEG C
Sour calcium pyroborate.
The average length of gained Dihydrate gypsum whiskers is 300 μm, and average diameter is 4 μm, average aspect ratio 80.
Embodiment 7
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
Desulfurization β phase semi-hydrated gypsum is mixed with the aqueous sulfuric acid that hydrogen ion concentration is 0.0001mol/L, is being mixed
The Dihydrate gypsum whiskers being made by embodiment 1 for accounting for desulfurization β phase semi-hydrated gypsum quality 2% are added in system, add quality
The glycerine that percentage composition is 15% carries out aquation crystallization, duration 30min at 40 DEG C；Backward solution in be added
Calcium carbonate carries out acid-base neutralization, adjusts the pH value of solution to being separated by solid-liquid separation after 7, is washed to isolated solid with water
It washs, dry 2h, obtains the Dihydrate gypsum whiskers at 100 DEG C.
The average length of gained Dihydrate gypsum whiskers is 230 μm, and average diameter is 1.6 μm, average aspect ratio 120.
Comparative example 1
The present embodiment prepares a kind of Dihydrate gypsum whiskers, preparation method are as follows:
It carries out desulfurization β phase semi-hydrated gypsum and water to be mixed to get suspension, stirring carries out aquation crystallization at 40 DEG C, continues
Time is 30min；Backward solution in calcium carbonate be added carry out acid-base neutralization, adjust the pH value of solution to carrying out solid-liquid point after 7
From being washed to isolated solid with water, dry 2h, obtains the Dihydrate gypsum whiskers at 100 DEG C.
The average length of gained Dihydrate gypsum whiskers is 100 μm, and average diameter is 4.5 μm, average aspect ratio 26.
The performance parameter of Dihydrate gypsum whiskers made from embodiment 1-7 and comparative example 1 summarizes such as table 1.
Table 1
From 1 data of table: the method for the present invention for preparing Dihydrate gypsum whiskers and hemihydrate calcium sulfate crystal whisker is in room
It can be carried out under temperature or high temperature, overcome and prepare calcium sulfate crystal whiskers and generally occur within the problems such as energy consumption is high, low efficiency；And it is prepared into
The whisker morphology arrived is completely uniform, and compared with the product of comparative example, draw ratio is greatly optimized；It is added in the reaction system organic
The draw ratio performance crystallized in the case where auxiliary agent and/or crystal seed is more excellent, and draw ratio maximum can reach 120.
The Applicant declares that the present invention is explained by the above embodiments it is of the invention it is a kind of prepare Dihydrate gypsum whiskers,
The method of hemihydrate calcium sulfate crystal whisker and product as made from it, but the present invention is not limited to the above embodiments, that is, does not mean that
The present invention, which must rely on above-described embodiment, to be implemented.It should be clear to those skilled in the art, appoints to of the invention
What is improved, addition, selection of concrete mode of equivalence replacement and auxiliary element to each raw material of product of the present invention etc., all falls within this
Within the protection scope and the open scope of invention.The preferred embodiment of the present invention has been described above in detail, and still, the present invention is simultaneously
The detail being not limited in above embodiment within the scope of the technical concept of the present invention can be to technical side of the invention
Case carries out a variety of simple variants, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
Claims (10)
1. a kind of method for preparing Dihydrate gypsum whiskers, which is characterized in that the method are as follows: anhydrous with semi-hydrated gypsum or III type
Gypsum is raw material, places it in inorganic strong acid solution and mixes, and carries out aquation crystallization, obtains the Dihydrate gypsum whiskers.
2. the method as described in claim 1, which is characterized in that the inorganic acid includes sulfuric acid, nitric acid, hydrochloric acid, phosphoric acid, hydrogen
In bromic acid, hydroiodic acid or perchloric acid any one or at least two combination；
Preferably, the inorganic acid is sulfuric acid；
Preferably, hydrionic molar concentration is not less than 0.0001mol/L in the inorganic strong acid solution.
3. method according to claim 1 or 2, which is characterized in that the additive amount of the semi-hydrated gypsum or III type anhydrous gypsum
For the 1-30% of solution quality；
Preferably, the semi-hydrated gypsum includes α phase semi-hydrated gypsum and/or β phase semi-hydrated gypsum；
Preferably, the raw material for preparing of the semi-hydrated gypsum includes industry by-product gypsum and/or the natural gypsum.
4. method as claimed in any one of claims 1-3, which is characterized in that further include in mixed system after the mixing
Organic additive is added；
Preferably, the organic additive includes methanol, ethyl alcohol, ethylene glycol, propyl alcohol, propylene glycol, glycerine, butanediol, butantriol
In pentanediol any one or at least two combination；
Preferably, mass percentage of the organic additive in mixed system is 1-90%, preferably 1-40%；
It preferably, further include that crystal seed is added in mixed system after the mixing；
Preferably, the additive amount of the crystal seed is the 0.1-10% of material quality.
5. such as method of any of claims 1-4, which is characterized in that described to obtain after Dihydrate gypsum whiskers to it
It is post-processed, the operation of the post-processing are as follows: be separated by solid-liquid separation after adjusting the pH value to 6-8 of solution, to isolated
Solid is washed, dry；
Preferably, the method for the pH value for adjusting solution is to carry out acid-base neutralization with calcium carbonate, calcium hydroxide or calcium oxide；
Preferably, the temperature of the drying is 40-150 DEG C；
Preferably, the time of the drying is 1-3h.
6. method according to any one of claims 1 to 5, which is characterized in that the temperature when progress aquation crystallization is 0-
100℃；
Preferably, the duration for carrying out aquation crystallization is not less than 10min；
Preferably, it is stirred while the progress aquation crystallization with blender；
Preferably, the revolving speed of the blender is 60-600r/min.
7. such as method of any of claims 1-6, which is characterized in that the method specifically includes the following steps:
Using semi-hydrated gypsum or III type anhydrous gypsum as raw material, hydrogen ion molar concentration is placed it in not less than 0.0001mol/L's
It is mixed in inorganic strong acid solution, aquation crystallization is carried out at 0-100 DEG C, while being stirred with blender, the duration is not small
In 10min；Calcium carbonate is added into solution, calcium hydroxide or calcium oxide carry out acid-base neutralization, after the pH value to 6-8 for adjusting solution
It is separated by solid-liquid separation, isolated solid is washed, it is dry, obtain the Dihydrate gypsum whiskers.
8. a kind of Dihydrate gypsum whiskers being prepared using such as method of any of claims 1-7.
9. a kind of method for preparing hemihydrate calcium sulfate crystal whisker, which is characterized in that the method are as follows: by according to any one of claims 8 two
H 2 O calcium sulphate whisker is calcined, and the hemihydrate calcium sulfate crystal whisker is obtained, and calcination temperature is higher than 100 DEG C.
10. a kind of hemihydrate calcium sulfate crystal whisker being prepared using method as claimed in claim 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205671A (en) * | 2019-07-04 | 2019-09-06 | 江苏一夫科技股份有限公司 | It is a kind of to prepare Dihydrate gypsum whiskers, the method for hemihydrate calcium sulfate crystal whisker and product as made from it |
| CN113512761A (en) * | 2021-07-09 | 2021-10-19 | 浙江钙宝新材料有限公司 | Method for purifying industrial solid waste gypsum and preparing calcium sulfate whisker |
| CN114108100A (en) * | 2021-11-29 | 2022-03-01 | 内蒙古科技大学 | Calcium sulfate dihydrate whisker prepared from rare earth gypsum |
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| CN113512761A (en) * | 2021-07-09 | 2021-10-19 | 浙江钙宝新材料有限公司 | Method for purifying industrial solid waste gypsum and preparing calcium sulfate whisker |
| CN114108100A (en) * | 2021-11-29 | 2022-03-01 | 内蒙古科技大学 | Calcium sulfate dihydrate whisker prepared from rare earth gypsum |
| CN114108100B (en) * | 2021-11-29 | 2022-12-02 | 内蒙古科技大学 | Calcium sulfate dihydrate whisker prepared from rare earth gypsum |
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