CN109133690A - The method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue - Google Patents
The method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue Download PDFInfo
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- CN109133690A CN109133690A CN201811237704.5A CN201811237704A CN109133690A CN 109133690 A CN109133690 A CN 109133690A CN 201811237704 A CN201811237704 A CN 201811237704A CN 109133690 A CN109133690 A CN 109133690A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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Abstract
The present invention discloses a kind of method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue, specifically: into levigate titanium dioxide waste residue plus water is configured to slurry, composite nucleating agent is added into slurry and adjusts pH value to 1.0~5.5, then it is added in reaction kettle, it stirs and is continually fed into oxygen, it is heated to slight boiling condition, constant temperature is dehydrated crystallization, solution obtained is depressurized after reaction and is filtered, and it successively with boiling water and ethanol washing and dries respectively, obtain short hexagonal prisms α-titanium gypsum crystal, gained crystal is sieved and accounts for 15~30% by 10~30 μm, 30~80 μm account for 50~75%, 80~200 μm account for 10~20% proportion, average grain diameter is obtained as 20~60 μm and compression strength is in 70MPa or more, regular appearance, size uniformity High-strength α-titanium gypsum.It is this method simple process, at low cost, high-efficient.
Description
Technical field
The invention belongs to Industrial Solid Waste resource technology fields, and in particular to a kind of to utilize trade waste titanium dioxide waste residue
The method for preparing high-strength α-titanium gypsum.
Background technique
The meeting a large amount of industrial waste acid of by-product, these spent acid are unable to direct emission when producing titanium dioxide using acid system, it will usually
It is neutralized with calcium hydroxide, is translated into main component and is the industrial residue of calcium sulphate dihydrate, then these titanium dioxides are given up
Slag is piled up or is filled, but this backwardness and original processing means do not only take up a large amount of soils, environment is also constituted it is tight
It threatens again, and brings huge financial burden to titanium dioxide enterprise, seriously constrain the benign development of titanium dioxide industry.Such as
What is the need change and convert required for titanium dioxide waste residue has become us urgently and solves the problems, such as.However so far, not yet occur at
The industrialized route report of ripe processing titanium dioxide waste residue, to find out its cause, mainly new product and related matching technology and equipment are whole
It is inadequate that body develops dynamics；Furthermore product economy benefit is low, and the enthusiasm that enterprise participates in titanium dioxide waste residue utilization is not high.
High-strength α-gypsum is a kind of product of function admirable, has many advantages, such as that hardness is big, intensity is high, wearability is good, value
Much higher than other types gypsum, it is widely used in the fields such as mold, model, building, industrial art, medicine.α-gypsum at present
Industrial manufacture process is mainly solid phase autoclave method and liquid phase autoclave method.The operation of solid phase autoclave method is will be through broken two water stone of bulk
Cream raw material is placed in closed still kettle, is passed through hot steam and is heated up, under certain pressure conditions (such as 0.1-1MPa), warp
The dry grinding of product is simultaneously arrived α-gypsum by dehydration after a period of time to obtain the final product.The method simple process, but the product prepared
Energy is unstable, quality fluctuation is big, and technique intermittent operation, and the production cycle is long, energy consumption is high, higher cost.In liquid phase autoclave method
Salt solustion mehtod be in atmospheric conditions, levigate dihydrate gypsum powder to be placed in salting liquid and is boiled after a certain period of time, was carried out
Filter is washed, dry, and high-strength α-land plaster can be obtained.Though this method is not required to pressure vessel, the equipment of each process is more complex, and
Desalination and drying are all very difficult, therefore are difficult to realize industrialized production at present.Hydro-thermal method process in liquid phase autoclave method is will
Crystal modifier is added after dihydrate gypsum milling to stir to form suspension, dehydration is carried out under high temperature and pressure, forms high-strength α-gypsum,
The great advantage of the method is dehydrated in dissolution Crystallization Process in dihydrate gypsum, can use the growth side of crystal modifier control crystal
To being needed that its short cylinder, granular, needle-shaped etc. is made to meet production requirement according to properties of product.Therefore this method becomes high-quality
High-strength α-gypsum production main technique, is the hot spot of current studies in China.But conventional hydrothermal method is utilizing titanium dioxide waste residue
But there is obstacle in terms of preparing high-strength α-titanium gypsum, dihydrate gypsum purity is low mainly in titanium dioxide waste residue, impurity especially iron,
Ti content is high, the high-strength α of strong influence-titanium gypsum Crystallization Process, and the product crystal size for causing conventional hydrothermal method to produce is small, shape
Looks are not perfect, poor product quality.
Summary of the invention
In view of the above shortcomings of the prior art, the present invention provides a kind of using trade waste titanium dioxide waste residue as original
Material, prepare a kind of regular appearance, size uniformity high-strength α-titanium gypsum method, this method simple process, at low cost, efficiency
It is high.
Above-mentioned purpose of the invention is achieved by the following technical programs:
A method of high-strength α-titanium gypsum being prepared using trade waste titanium dioxide waste residue, to levigate titanium dioxide waste residue
In plus water be configured to slurry, composite nucleating agent is added into slurry and adjusts pH value to 1.0~5.5, is then added in reaction kettle,
Oxygen is stirred and be continually fed into, slight boiling condition is heated to, constant temperature is dehydrated crystallization, depressurizes solution obtained take out after reaction
Filter, and boiling water and ethanol washing are successively used respectively, the powder after washing is dried completely, it is brilliant to obtain short hexagonal prisms α-titanium gypsum
Body, by gained crystal sieve and by 10~30 μm account for 15~30%, 30~80 μm account for 50~75%, 80~200 μm account for 10~
20% proportion, obtaining average grain diameter is the α-titanium gypsum of 20~60 μm and compression strength in 70MPa or more；
The composite nucleating agent is that 1:1~10 compound by nucleating agent A and nucleating agent B by weight；Composite nucleating agent
Total dosage is the 0.5~3.0% of titanium dioxide waste residue weight；
The nucleating agent A is one or more of sodium formate, sodium propionate, sodium acrylate, sodium benzoate；
The nucleating agent B is one or more of potassium sulfate, ferric sulfate, aluminum sulfate, magnesium sulfate.
Preferably, the partial size of the levigate titanium dioxide waste residue is less than 270 mesh.
Preferably, the mass percent concentration of titanium dioxide waste residue is 10~50% in the slurry.
Preferably, the adjusting pH value is H using bronsted lowry acids and bases bronsted lowry, the acid+Molar concentration is the dilute sulfuric acid of 1mol/L
Or dilute hydrochloric acid, the alkali are the sodium hydroxide solution of 1mol/L.
Preferably, the speed of the stirring is 50~200 revs/min.
Preferably, the flow velocity for being passed through oxygen is 10~60mL/min.
Preferably, the time of the constant temperature dehydration crystallization is 3~8 hours.
Preferably, the temperature of the drying is 90~160 DEG C.
Technical principle and advantage of the invention is as follows:
The main function that the present invention adjusts pH value to 1.0~5.5 has the following: it is possible, firstly, to by titanium dioxide waste residue
A large amount of metal and convert metal oxides are soluble metallic salt, and these soluble metallic salts can just play a part
The effect of nucleating agent further promotes calcium sulphate dihydrate dissolution and the generation of α-titanium gypsum crystal and grows up, and this part gold
Belonging to salt can remove in last washing process, while can also improve the appearance of product very well；Secondly, suitable acyclic acidic
Border can control the quantity of the ionization complex anion of nucleating agent in system, thus control each crystallographic axis of α-titanium gypsum crystal along to growth
Speed, the pattern of final decision gained crystal.
Using in hydro-thermal method preparation α-titanium gypsum technique, when two water titanium gypsums are heat-treated in aqueous solution, occur first de-
Water can deviate from the crystallization water of a half molecule from two water titanium gypsum lattices if condition is suitble to, form half water titanium gypsum
Crystallite and nucleus.In the environment that liquid water surrounds, crystallite dissolves in the liquid phase quickly, when half water titanium gypsum concentration of liquid phase
When reaching supersaturation, nucleus is precipitated from solution, SO4 2-、Ca2+Equal growth units are formed coarse in nucleating surface apposition growth
Fine and close high-strength α-titanium gypsum crystal.In such a dissolution Crystallization Process, the growth of crystal is one slowly and orderly
Process needs opposing stationary growing environment, and in conventional hydrothermal method technique, when being heated up and kept the temperature behaviour at 100 DEG C or more
When making, the suspension in kettle can be in fluidized state always, and bubble is seethed from suspension bottom to liquid level incessantly, form one
The chaos state of a great variation greatly interferes the normal growth of half water titanium gypsum crystal, the environment meeting that surrounding acutely disturbs
Lead to crystal growth dislocation, vacancy.To overcome the above disadvantages, a large amount of salt medium, which is added, in salt solustion mehtod reduces by two water titanium gypsums
Phase transition temperature, but its post-processing is extremely complex, needs that all washing removes by salt medium, otherwise can seriously affect its α-titanium
The mechanical performance and service life of gypsum.Present invention also overcomes above-mentioned two big disadvantages, suitable nucleating agent are filtered out, micro-
Promote two water titanium gypsums to be dehydrated crystallization, and each axial rate of development of strict control α-titanium gypsum crystal in the state of boiling, obtains shape
The regular α of looks-titanium gypsum crystal.
Also contain a large amount of calcium sulfite in titanium dioxide waste residue, the present invention is being heated by being continually fed into enough oxygen
Under conditions of, promote calcium sulfite further to aoxidize, increases reactant concentration, promote reaction forward to carry out, to improve reaction
Yield.
Crystal is sieved and by 10~30 μm accounts for 15~30%, 30~80 μm and account for 50~75%, 80~200 μm and accounted for by the present invention
10~20% proportion obtains α-titanium gypsum that average grain diameter is 20~60 μm, and compression strength is in 70MPa or more, Ke Yiguang
General to be used to building heat preservation, precision die, the high-value-use of Industrial Solid Waste is realized in the fields such as high-grade bathroom.
Compared with prior art, the invention has the following beneficial effects:
(1) compared with Dynamic Water thermal method, reaction condition is mild, can carry out under normal pressure.
(2) it compared with salt solustion mehtod, does not need to add additional salt medium, without complicated last handling process.
(3) α-titanium gypsum crystal morphology of method of the invention preparation is regular, and specific surface area is smaller, normal consistency water requirement
Low, dry compression strength breaks through 70MPa, can expand titanium gypsum application range, promotes the comprehensive benefit of α-titanium gypsum high level a large amount
With.
(4) using trade waste titanium dioxide waste residue as raw material, industrial solid waste residue is recycled, is good for the environment.
(5) present invention recycles Industrial Solid Waste, and simple process, at low cost, high-efficient, product quality is excellent, belongs to green
Colour chemistry meets national green development strategy.
Detailed description of the invention
Fig. 1 is the scanning electron microscope (SEM) photograph for short hexagonal prisms α-titanium gypsum crystal that embodiment 1 obtains；
Fig. 2 is the scanning electron microscope (SEM) photograph for short hexagonal prisms α-titanium gypsum crystal that embodiment 2 obtains；
Fig. 3 is the scanning electron microscope (SEM) photograph for short hexagonal prisms α-titanium gypsum crystal that embodiment 3 obtains；
Fig. 4 is the scanning electron microscope (SEM) photograph for short hexagonal prisms α-titanium gypsum crystal that embodiment 4 obtains；
Fig. 5 is α-titanium gypsum crystal scanning electron microscope (SEM) photograph that comparative example 1 obtains；
Fig. 6 is α-titanium gypsum crystal scanning electron microscope (SEM) photograph that comparative example 2 obtains；
Fig. 7 is α-titanium gypsum crystal scanning electron microscope (SEM) photograph that comparative example 3 obtains.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.
Embodiment 1
The method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue of the invention, the specific steps are as follows:
The titanium dioxide waste residue used for acid system produce titanium dioxide through calcium hydroxide treated contain a certain amount of Fe2O3It is miscellaneous
Matter and a large amount of free waters, apparent is in the solid slag of the great stickiness of kermesinus.
It (1) is 10% to being milled down to titanium dioxide waste residue of the partial size less than 270 mesh water is added to be configured to mass percent concentration
Slurry.
(2) composite nucleating agent is added into slurry made from step (1), the composite nucleating agent is by nucleating agent A and nucleation
Agent B is that 1:1 is compounded by weight, and composite nucleating agent additional amount is the 0.5% of titanium dioxide waste residue weight, and nucleating agent A is first
Sour sodium, nucleating agent B is potassium sulfate and ferric sulfate, and respectively accounts for nucleating agent B total amount half.
(3) H is used+Sodium hydroxide solution regulating step (2) system of dilute sulfuric acid and 1mol/L that molar concentration is 1mol/L
Suspension pH value to 1.0.
(4) the prepared suspension of step (3) is added in reaction kettle, stirs and is continually fed by the flow velocity of 10mL/min
Oxygen is heated to slight boiling condition, and constant temperature is dehydrated crystallization 3 hours, and mixing speed is 50 revs/min.
(5) solution is depressurized after reaction and is filtered, and washed 3 times with boiling water, with ethanol washing 3 times, after washing
Powder is dried completely at 90 DEG C, and obtaining partial size is 10~200 μm, and short hexagonal prisms α-titanium gypsum that draw ratio is 1.2~2:1 is brilliant
Body, as shown in Fig. 1.
(6) crystal obtained by step (5) is sieved and accounts for 15% by 10~30 μm, 30~80 μm account for 75%, and 80~200 μm account for
10% proportion, obtains α-titanium gypsum that average grain diameter is 20~60 μm and compression strength is 70MPa, and conversion rate of reaction product is
94%.
Embodiment 2
The method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue of the invention, the specific steps are as follows:
The titanium dioxide waste residue used for acid system produce titanium dioxide through calcium hydroxide treated contain a certain amount of Fe2O3It is miscellaneous
Matter and a large amount of free waters, apparent is in the solid slag of the great stickiness of kermesinus.
It (1) is 50% to being milled down to titanium dioxide waste residue of the partial size less than 270 mesh water is added to be configured to mass percent concentration
Slurry.
(2) composite nucleating agent is added into slurry made from step (1), the composite nucleating agent is by nucleating agent A and nucleation
Agent B is that 1:10 is compounded by weight, and composite nucleating agent additional amount is the 3.0% of titanium dioxide waste residue weight, and nucleating agent A is third
Sour sodium and sodium benzoate, and the half of nucleating agent A total amount is respectively accounted for, nucleating agent B is ferric sulfate.
(3) H is used+Sodium hydroxide solution regulating step (2) system of dilute hydrochloric acid and 1mol/L that molar concentration is 1mol/L
Suspension pH value to 5.5.
(4) the prepared suspension of step (3) is added in reaction kettle, stirs and is continually fed by the flow velocity of 60mL/min
Oxygen is heated to slight boiling condition, and constant temperature is dehydrated crystallization 8 hours, and mixing speed is 200 revs/min.
(5) solution is depressurized after reaction and is filtered, and washed 5 times with boiling water, with ethanol washing 1 time, after washing
Powder is dried completely at 160 DEG C, and obtaining partial size is 10~200 μm, and draw ratio is short hexagonal prisms α-titanium gypsum of 1.2~2:1
Crystal, as shown in Fig. 2.
(6) crystal obtained by step (5) is sieved and accounts for 30% by 10~30 μm, 30~80 μm account for 50%, and 80~200 μm account for
20% proportion, obtains α-titanium gypsum that average grain diameter is 20~60 μm and compression strength is 75MPa, and conversion rate of reaction product is
93%.
Embodiment 3
The method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue of the invention, the specific steps are as follows:
The titanium dioxide waste residue used for acid system produce titanium dioxide through calcium hydroxide treated contain a certain amount of Fe2O3It is miscellaneous
Matter and a large amount of free waters, apparent is in the solid slag of the great stickiness of kermesinus.
It (1) is 30% to being milled down to titanium dioxide waste residue of the partial size less than 270 mesh water is added to be configured to mass percent concentration
Slurry.
(2) composite nucleating agent is added into slurry made from step (1), the composite nucleating agent is by nucleating agent A and nucleation
Agent B is that 1:5 is compounded by weight, and composite nucleating agent additional amount is the 1.0% of titanium dioxide waste residue weight, and nucleating agent A is benzene
Sodium formate, nucleating agent B are aluminum sulfate.
(3) H is used+Sodium hydroxide solution regulating step (2) system of dilute hydrochloric acid and 1mol/L that molar concentration is 1mol/L
Suspension pH value to 4.5.
(4) the prepared suspension of step (3) is added in reaction kettle, stirs and is continually fed by the flow velocity of 50mL/min
Oxygen is heated to slight boiling condition, and constant temperature is dehydrated crystallization 5 hours, and mixing speed is 100 revs/min.
(5) solution is depressurized after reaction and is filtered, and washed 5 times with boiling water, with ethanol washing 3 times, after washing
Powder is dried completely at 100 DEG C, and obtaining partial size is 10~200 μm, and draw ratio is short hexagonal prisms α-titanium gypsum of 1.2~2:1
Crystal, as shown in Fig. 3.
(6) crystal obtained by step (5) is sieved and accounts for 30% by 10~30 μm, 30~80 μm account for 60%, and 80~200 μm account for
10% proportion, obtains α-titanium gypsum that average grain diameter is 20~60 μm and compression strength is 78MPa, and conversion rate of reaction product is
94%.
Embodiment 4
The method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue of the invention, the specific steps are as follows:
The titanium dioxide waste residue used for acid system produce titanium dioxide through calcium hydroxide treated contain a certain amount of Fe2O3It is miscellaneous
Matter and a large amount of free waters, apparent is in the solid slag of the great stickiness of kermesinus.
It (1) is 30% to being milled down to titanium dioxide waste residue of the partial size less than 270 mesh water is added to be configured to mass percent concentration
Slurry.
(2) composite nucleating agent is added into slurry made from step (1), the composite nucleating agent is by nucleating agent A and nucleation
Agent B is that 1:7 is compounded by weight, and composite nucleating agent additional amount is the 1.0% of titanium dioxide waste residue weight, and nucleating agent A is third
Olefin(e) acid sodium, nucleating agent B are magnesium sulfate.
(3) H is used+Sodium hydroxide solution regulating step (2) system of dilute hydrochloric acid and 1mol/L that molar concentration is 1mol/L
Suspension pH value to 1.0.
(4) the prepared suspension of step (3) is added in reaction kettle, stirs and is continually fed by the flow velocity of 60mL/min
Oxygen is heated to slight boiling condition, and constant temperature is dehydrated crystallization 5 hours, and mixing speed is 100 revs/min.
(5) solution is depressurized after reaction and is filtered, and washed 5 times with boiling water, with ethanol washing 3 times, after washing
Powder is dried completely at 100 DEG C, and obtaining partial size is 10~200 μm, and draw ratio is short hexagonal prisms α-titanium gypsum of 1.2~2:1
Crystal, as shown in Fig. 4.
(6) crystal obtained by step (5) is sieved and accounts for 30% by 10~30 μm, 30~80 μm account for 50%, and 80~200 μm account for
20% proportion, obtains α-titanium gypsum that average grain diameter is 20~60 μm and compression strength is 74MPa, and conversion rate of reaction product is
95%.
Embodiment 5
Short hexagonal prisms α-titanium gypsum crystal made from Examples 1 to 4 is scanned Electronic Speculum respectively, obtains the difference of Fig. 1~4
For short hexagonal prisms α-titanium gypsum crystal scanning electron microscope (SEM) photograph obtained by Examples 1 to 4.
Gained crystal morphology is regular it can be seen from Fig. 1~4, and draw ratio is about 1.2~2:1, and partial size is about 10~200 μ
m。
Comparative example 1
Unlike the first embodiment, comparative example 1 does not carry out step (3) " using H+Molar concentration is dilute sulphur of 1mol/L
The pH value of suspension made from the sodium hydroxide solution regulating step (2) of acid and 1mol/L is to 1.0.", other process conditions and reality
It is identical to apply example 1, gained α-titanium gypsum crystal morphology is as shown in figure 5, product compression strength is 33MPa.
Comparative example 2
Unlike the first embodiment, step (4) is not passed through oxygen in comparative example 2, other process conditions and 1 phase of embodiment
Together, gained α-titanium gypsum crystal morphology is as shown in fig. 6, product compression strength is 30MPa, and reaction yield is less than 75%.
Comparative example 3
Unlike the first embodiment, comparative example 3 does not carry out step (2) and " is added into slurry made from step (1) multiple
Synthetic kernel agent ", other process conditions are same as Example 1, and gained α-titanium gypsum crystal morphology is as shown in fig. 7, product pressure resistance
Degree is 18MPa.
Comparative example 4
Unlike the first embodiment, comparative example 4 does not carry out step (6) and " sieves crystal obtained by step (5) and by 10
~30 μm account for 15%, and 30~80 μm account for 75%, 80~200 μm account for 10% proportion ", other process conditions are same as Example 1,
Product compression strength is 45MPa.
Claims (8)
1. the method for preparing high-strength α-titanium gypsum using trade waste titanium dioxide waste residue, which is characterized in that levigate titanium white
In powder waste residue plus water is configured to slurry, and composite nucleating agent is added into slurry and adjusts pH value to 1.0~5.5, is then added anti-
It answers in kettle, stirs and be continually fed into oxygen, be heated to slight boiling condition, constant temperature is dehydrated crystallization, after reaction by solution obtained
Decompression filters, and successively with boiling water and ethanol washing and dries respectively, short hexagonal prisms α-titanium gypsum crystal is obtained, by gained crystal
Sieve and by 10~30 μm account for 15~30%, 30~80 μm account for 50~75%, 80~200 μm account for 10~20% proportion, obtain
Average grain diameter is the high-strength α-titanium gypsum of 20~60 μm and compression strength in 70MPa or more；
The composite nucleating agent is that 1:1~10 compound by nucleating agent A and nucleating agent B by weight；Composite nucleating agent is always used
Amount is the 0.5~3.0% of titanium dioxide waste residue weight；
The nucleating agent A is one or more of sodium formate, sodium propionate, sodium acrylate, sodium benzoate；
The nucleating agent B is one or more of potassium sulfate, ferric sulfate, aluminum sulfate, magnesium sulfate.
2. the method according to claim 1, wherein the partial size of the levigate titanium dioxide waste residue is less than 270 mesh.
3. the method according to claim 1, wherein in the slurry titanium dioxide waste residue mass percent concentration
It is 10~50%.
4. the method according to claim 1, wherein the adjusting pH value, using bronsted lowry acids and bases bronsted lowry, the acid is H+
Molar concentration is the dilute sulfuric acid or dilute hydrochloric acid of 1mol/L, and the alkali is the sodium hydroxide solution of 1mol/L.
5. the method according to claim 1, wherein the speed of the stirring is 50~200 revs/min.
6. the method according to claim 1, wherein the flow velocity for being passed through oxygen is 10~60mL/min.
7. the method according to claim 1, wherein the time of constant temperature dehydration crystallization is 3~8 hours.
8. the method according to claim 1, wherein the temperature of the drying is 90~160 DEG C.
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| CN103964716A (en) * | 2014-04-08 | 2014-08-06 | 湖北大学 | Method for preparing high-strengthalpha-semihydratetitanium gypsum with industrial wastedihydratetitanium gypsum |
| WO2017005350A1 (en) * | 2015-07-06 | 2017-01-12 | Heidelbergcement Ag | Method for binding carbon dioxide |
| CN106866009A (en) * | 2017-03-15 | 2017-06-20 | 贵州大学 | A kind of method that half water ardealite prepares alpha type high-strength gypsum |
| CN107059134A (en) * | 2017-03-21 | 2017-08-18 | 东南大学 | A kind of method that crystal whisker of gypsum is prepared under normal pressure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110304850A (en) * | 2019-06-24 | 2019-10-08 | 江苏一夫科技股份有限公司 | A method of alpha semi-hydrated gypsum is produced based on titanium gypsum |
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| CN109133690B (en) | 2021-07-20 |
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