CN106145727A - A kind of process of desulphurization gypsum for preparing high strength plaster of Paris - Google Patents
A kind of process of desulphurization gypsum for preparing high strength plaster of Paris Download PDFInfo
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- CN106145727A CN106145727A CN201610352632.3A CN201610352632A CN106145727A CN 106145727 A CN106145727 A CN 106145727A CN 201610352632 A CN201610352632 A CN 201610352632A CN 106145727 A CN106145727 A CN 106145727A
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- plaster
- desulfurated plaster
- paris
- high strength
- gypsum
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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
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The present invention relates to provide the process of a kind of desulphurization gypsum for preparing high strength plaster of Paris, comprise the steps: 1) it by mass percentage, desulfurated plaster by 88～97%, 1～4% composite curing agent, 2～8% is combined alkali-activator and uniformly mixes；2), after mixing, calcining at constant temperature 2～3h 200～350 DEG C in the range of is put into into calcining furnace；3) take out after calcining completes, after cooling, carry out levigate process；4) it is finally aged 3～4 days and get final product.The present invention can be effectively prevented from secondary environmental pollution, greatly reduce the harm to human body and environment for the contained trace element in desulfurated plaster, change desulfurated plaster particle is normal distribution simultaneously, the shortcomings such as distribution of particles height is heavily concentrated, agglutination material poor fluidity, water requirement height, short texture, intensity are low, can prepare half water desulfurization gypsum powder and the desulfurization gypsum powder of high intensity.
Description
Technical field
The present invention relates to process and the using method thereof of a kind of desulphurization gypsum for preparing high strength plaster of Paris.
Background technology
Desulfurated plaster is the trade waste of Wet-process Phosphoric Acid Production process discharge in phosphorous chemical industry, produces one ton of phosphoric acid by wet process
(with P2O5Meter) produce 4.5～5 tons of desulfurated plasters.Desulfurated plaster be mainly composed of calcium sulfate, chemical formula is CaSO4·2H2O,
Additionally contain other impurity multiple.In desulfurated plaster, the impurity such as institute's fluoride, free phosphoric acid, organic matter, radioactivity are to lead
Cause desulfurated plaster during storing up, cause the principal element of environmental pollution.Storing up in a large number of desulfurated plaster, has not only occupied soil
Ground resource, due to wind erosion, drenching with rain causes the pollution of air, water system and soil.Long-time contact desulfuriation gypsum, may result in people's
Pathology.
The comprehensive utilization ratio of existing desulfurated plaster is not high, and mainly due to containing more impurity in desulfurated plaster, two is existing
The technique that some desulfurated plasters prepare high-strength plaster of Paris is also immature, and the gypsum of preparation exists that length setting time, intensity is low, stream
The big shortcoming of dynamic property difference, normal consistency water requirement.
Content of the invention
The technique side that the technical problem to be solved is to provide a kind of desulphurization gypsum for preparing high strength plaster of Paris
Method, it is normal distribution that plaster of Paris prepared by this process can overcome desulfurated plaster particle, distribution of particles height heavily concentrates,
The low shortcoming of agglutination material poor fluidity, water requirement height, short texture, intensity.
The present invention solves above-mentioned technical problem and be the technical scheme is that a kind of desulphurization gypsum for preparing high strength paring stone
The process of cream, comprises the steps:
(1) by mass percentage, by 88～97% desulfurated plaster, 1～4% composite curing agent, 2～8% be combined alkali
Property exciting agent uniformly mixes；
(2), after mixing, calcining at constant temperature 2～3h 200～350 DEG C in the range of is put into into calcining furnace；
(3) take out after calcining completes, after cooling, carry out levigate process；
(4) it is finally aged 3～4 days and get final product.
In order to the method for the present invention is better achieved, further, raw material group by mass percentage in described step (1)
Become: desulfurated plaster 94～97%, composite curing agent 1～2%, compound 2～4 parts of % of alkali-activator.
In order to the method for the present invention is better achieved, further, raw material group by mass percentage in described step (1)
Become: desulfurated plaster 91～95%, composite curing agent 1.5～3%, compound 3.5～6 parts of % of alkali-activator.
In order to the method for the present invention is better achieved, further, described composite curing agent is potassium, magnesium, aluminium, silicon, sulphur
Metallic salt.
In order to the method for the present invention is better achieved, further, described compound alkali-activator is calcium hydroxide, sial
Alkaline waste.
Due to desulfurated plaster and the natural gypsum difference in terms of composition and mechanism so that it is the natural gypsum can not be replaced direct
For producing building materials of gypsum, therefore desulfurated plaster is prepared as the plaster of Paris of two must pre-process to desulfurated plaster,
Remove the impact of main objectionable impurities and improve that desulfurated plaster length setting time, intensity is low, poor fluidity, normal consistency water requirement
Big shortcoming.Due to the source of desulfurated plaster and phosphorus ore, and composition and the production phosphoric acid process condition of phosphorus ore and there are differences,
Make desulfurated plaster impurities component considerably complicated, so first having to when selecting desulfurated plaster determine producer is what uses
The technique of sample.It has been generally acknowledged that: the desulfurated plaster impurity content of two water process by-product is most；Half water～bis-water law and two water～half water
The desulfurated plaster impurity content of method by-product is relatively fewer.Impurity in desulfurated plaster includes three major types: the 1st, free phosphoric acid and sulfuric acid
Being the acid of filtration residue in Wet-process Phosphoric Acid Production, free acid can produce certain corrosivity to structure building materials, also can prolong simultaneously
The setting time of long gypsum, makes gypsum intensity decline；2nd, titanium pigment (including free phosphoric acid and one-lime phosphate etc.), during aquation,
Can with easily in Ca ionic reaction generate the tricalcium phosphate of indissoluble, and adhere to desulfurated plaster surface, thus stop gypsum to enter one
Step aquation and dissolution so that desulfurated plaster prolongations setting time, short texture, intensity reduction, additionally also fluoride, when fluorine contains
The intensity of desulfurated plaster, the gypsum sets that slows down time can be significantly reduced when amount is higher than 0.3%；3rd, organic substance, is mainly distributed on
Desulfurated plaster surface, relatively big on the impact of desulfurated plaster quality, can make plastering surface blackening, long green hair, the setting rate that slows down,
Reduce product strength.In sum, wanting to obtain excellent building gypsum plaster, it is necessary to pre-process desulfurated plaster, this is
Prepare the key point of various gypsum final products, only by the building gypsum plaster warp again obtaining after desulfurated plaster pretreatment
Cross chemical modification and just can obtain the gypsum product of high intensity, water-tolerant, could be more widely used at building field, no
Then by by very big restriction.The preprocess method of desulfurated plaster is a lot, including WATER-WASHING METHOD, neutralisation, floatation, flash burning
Methods etc., wherein WATER-WASHING METHOD technology maturation, effect is preferable, the gypsum stable performance after process, and external employing mostly is this kind of method.But
Being the method complex process, investment is big, and water consumption and energy consumption are big, and the sewage after washing must process can discharge through special equipment,
Otherwise can cause secondary pollution.Neutralisation uses the acid in cheap CaO and in desulfurated plaster, fluorine so that it is be converted into inertia difficult
Dissolved salt, adjusts the pH value of desulfurated plaster, eliminates the impact on its performance for the residual acid in desulfurated plaster, and lime blending amount of controlling well is
The key of lime neutralisation, the method technique is simple, and small investment does not produce pollution, and effect is notable, and feeding is convenient, therefore uses
It is a kind of pretreatment mode economic, practical, effective that neutralisation carries out pretreatment to desulfurated plaster, but, the method can not disappear
Except the harmful effect to its performance organic in desulfurated plaster.Therefore, the present invention uses method for calcinating to eliminate organic matter simultaneously
Problem.
The present invention uses the technological process of neutralisation and the mechanism to be: the 1st, the desulfurated plaster first to desulfurated plaster manufacturer production
Carry out facies analysis, draw the content of free phosphoric acid, fluorine, and draw addition quick lime or composite curing agent, compound alkali by experiment
The volume of property exciting agent.2nd, the above-mentioned raw materials stirring mixing that will determine；3rd, calcining, usual desulfurated plaster contains the trip of 20～30%
From the crystallization water of water and 20%, also referred to as two water desulfurated plasters, can be to semi-hydrated gypsum, nothing under two water desulfurated plaster heating conditions
Water gypsum converts, and temperature is different, and conversion ratio is different.Want the half water plaster of Paris that processability is excellent, it is desirable to semi-hydrated gypsum content
Height, anhydrous gypsum content is low, thus must select suitable temperature.Desulfurated plaster be converted into the dewatering Principle of plaster of Paris with
The natural gypsum is similar, but because of the existence of impurity in desulfurated plaster so that it is there is bigger difference with natural gypsum dehydration temperaturre.Generally with
Calcining heat to raise, transformation ratio and intensity are ascendant trends, and when peaking, this temperature can be identified as this desulfurization stone
The calcining heat of cream.Meanwhile, experiment shows, owing to gypsum is the non-conductor of heat, so gypsum particle surface temperature reaches to set
After fixed temperature, its internal temperature is but less than design temperature, can cause the structure phase skewness of desulfurated plaster, accordingly, it would be desirable to one
Fixed constant temperature time, with the prolongation of constant temperature time, plaster of Paris intensity and transformation ratio increase, but long intensity can under
Fall, considers with Energy Angle from combination property, 2h is an optimal constant temperature time point.4th, ball-milling treatment, the micro-knot of desulfurated plaster
There is significant difference in structure and the natural gypsum, based in desulfurated plaster, dihydrate gypsum crystal is with six panel shapes, particle is normal distribution,
Crystal is uniform, regular, and this particle characteristic makes its poor fluidity, water requirement height, short texture, intensity relatively low.By neutralizing, sieving
Point, the preprocessing means such as calcining be to eliminate the impact of main objectionable impurities in desulfurated plaster, and the particle of desulfurated plaster is divided
Cloth, form etc. do not produce impact, and are to improve the effective means of desulfurated plaster grain structure by ball-milling treatment, can make desulfurization stone
Uniform, the regular platy structure of cream presents column, the diversified particle shape such as granular, can increase cementing material simultaneously, make
Its water requirement is greatly lowered, and adds mobility, makes high and short texture the defect of hardenite clearance rate be solved at all.
Being shown by great many of experiments, ball milling pretreatment compound with neutralization, calcining etc. combines, and just can prepare excellent plaster of Paris.6、
Ageing, contains a certain amount of anhydrous gypsum phase due in the building gypsum plaster of calcining gained, causes plaster of Paris water consumption to beat, solidifying
The adverse consequences such as the knot time is long, and hardening strength is relatively low, are the performance improving plaster of Paris, it is necessary to through ageing after a while.
With the prolongation of digestion time, consumptive use of water normal consistence reduces, and resistance to compression, rupture strength improve, and concrete digestion time can be by testing
Data draw.
Plaster of Paris prepared by the present invention, can be widely used for high-performance light composite gypsum body of wall, building block, Light Wall
The building productses such as brick, brushing gypsum, gypsum putty.
To sum up, the invention has the beneficial effects as follows:
1st, desulfurated plaster can be removed the impurity such as dephosphorization, fluorine, organic matter by the present invention so that it is volatilizees or is converted into harmless lazy
Property material, such as calcium pyrophosphate and phosphate, aluminate class etc..The present invention can be effectively prevented from secondary environmental pollution, significantly
Decrease the harm to human body and environment for the contained trace element in desulfurated plaster.Change desulfurated plaster particle is that normal state is divided simultaneously
Cloth, the shortcomings such as distribution of particles height is heavily concentrated, agglutination material poor fluidity, water requirement height, short texture, intensity are low.
2nd, the present invention can generate the C-S-H (hydrated calcium silicate gel) with gelling performance to desulfurated plaster, on the other hand
Aquation generates Ca (OH)2, solubility and the dissolution velocity of gypsum can be changed, make desulfurated plaster have air-setting dual with the hydraulicity
The Binder Materials of character so that it is intensity improves a lot.
Detailed description of the invention
The process of the desulphurization gypsum for preparing high strength plaster of Paris of the present invention, comprises the steps:
(1) raw material consists of by mass percentage: composite curing agent 0.5～2%, compound alkali-activator 1.5～4
Part %, balance of desulfurated plaster or desulfurated plaster, composite curing agent is the metallic salts such as potassium, magnesium, aluminium, silicon, sulphur, and compound alkalescence swashs
Sending out agent is calcium hydroxide, sial alkaline waste etc.；
(2) raw material after mixing described for step (1) raw material enters calcining furnace perseverance in the range of 150～200 DEG C
Temperature calcining 2h；
(3) raw material after calcining step (2) cools down naturally, through the levigate process of ball milling after cooling；
(4) by the raw material aging 3～4 days after levigate for step (3) and get final product.
In the present embodiment preparation method, each material quality percentage composition can be found in following table:
The plaster of Paris that each embodiment proportioning in upper table is prepared through present invention process method, through testing inspection, phase
Close testing result as shown in the table:
| Testing index | Technology requires | Testing result |
| Compression strength (MPa) | ≥2.9 | 6.0 |
| Rupture strength (MPa) | ≥1.8 | 4.2 |
| Presetting period (min) | ≥6 | 15 |
| Final setting time (min) | ≤30 | 22 |
Claims (5)
1. the process of a desulphurization gypsum for preparing high strength plaster of Paris, it is characterised in that comprise the steps:
(1) by mass percentage, by 88～97% desulfurated plaster, 1～4% composite curing agent, 2～8% be combined alkali-activator
Uniformly mixing；
(2), after mixing, calcining at constant temperature 2～3h 200～350 DEG C in the range of is put into into calcining furnace；
(3) take out after calcining completes, after cooling, carry out levigate process；
(4) it is finally aged 3～4 days and get final product.
2. the process of desulphurization gypsum for preparing high strength plaster of Paris according to claim 1, it is characterised in that described
In step (1), raw material consists of by mass percentage: desulfurated plaster 94～97%, composite curing agent 1～2%, and compound alkalescence swashs
Send out 2～4 parts of % of agent.
3. the process of desulphurization gypsum for preparing high strength plaster of Paris according to claim 1, it is characterised in that described
In step (1), raw material consists of by mass percentage: desulfurated plaster 91～95%, composite curing agent 1.5～3%, compound alkalescence
3.5～6 parts of % of exciting agent.
4. the process of desulphurization gypsum for preparing high strength plaster of Paris according to claim 1, it is characterised in that described
Composite curing agent is the metallic salt of potassium, magnesium, aluminium, silicon, sulphur.
5. the process of desulphurization gypsum for preparing high strength plaster of Paris according to claim 1, it is characterised in that described
Compound alkali-activator is calcium hydroxide, sial alkaline waste.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610352632.3A CN106145727A (en) | 2016-05-24 | 2016-05-24 | A kind of process of desulphurization gypsum for preparing high strength plaster of Paris |
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| CN201610352632.3A CN106145727A (en) | 2016-05-24 | 2016-05-24 | A kind of process of desulphurization gypsum for preparing high strength plaster of Paris |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109665731A (en) * | 2018-12-29 | 2019-04-23 | 泰山石膏有限公司 | A kind of preparation method of the full desulphurization building gypsum of plastering mortar |
| CN115353361A (en) * | 2022-07-13 | 2022-11-18 | 广东能源集团科学技术研究院有限公司 | Composite cementing material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101597147A (en) * | 2009-07-06 | 2009-12-09 | 贵州安捷能建筑材料发展有限公司 | The processing method of a kind of phosphogypsum, desulphurization gypsum for preparing high strength plaster of Paris |
| CN105384372A (en) * | 2015-11-27 | 2016-03-09 | 山东先罗输送机械有限公司 | Method and device for preparing building gypsum from desulfurized gypsum |
| CN105417975A (en) * | 2015-10-14 | 2016-03-23 | 王慧 | Technique for preparing building gypsum from desulfurized gypsum |
-
2016
- 2016-05-24 CN CN201610352632.3A patent/CN106145727A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597147A (en) * | 2009-07-06 | 2009-12-09 | 贵州安捷能建筑材料发展有限公司 | The processing method of a kind of phosphogypsum, desulphurization gypsum for preparing high strength plaster of Paris |
| CN105417975A (en) * | 2015-10-14 | 2016-03-23 | 王慧 | Technique for preparing building gypsum from desulfurized gypsum |
| CN105384372A (en) * | 2015-11-27 | 2016-03-09 | 山东先罗输送机械有限公司 | Method and device for preparing building gypsum from desulfurized gypsum |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109665731A (en) * | 2018-12-29 | 2019-04-23 | 泰山石膏有限公司 | A kind of preparation method of the full desulphurization building gypsum of plastering mortar |
| CN109665731B (en) * | 2018-12-29 | 2021-12-24 | 泰山石膏有限公司 | Preparation method of full-desulfurization building gypsum for plastering mortar |
| CN115353361A (en) * | 2022-07-13 | 2022-11-18 | 广东能源集团科学技术研究院有限公司 | Composite cementing material and preparation method and application thereof |
| CN115353361B (en) * | 2022-07-13 | 2023-11-28 | 广东能源集团科学技术研究院有限公司 | Composite cementing material and preparation method and application thereof |
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Application publication date: 20161123 |