CN101372404B - Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum - Google Patents
Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum Download PDFInfo
- Publication number
- CN101372404B CN101372404B CN2008100228421A CN200810022842A CN101372404B CN 101372404 B CN101372404 B CN 101372404B CN 2008100228421 A CN2008100228421 A CN 2008100228421A CN 200810022842 A CN200810022842 A CN 200810022842A CN 101372404 B CN101372404 B CN 101372404B
- Authority
- CN
- China
- Prior art keywords
- crystalline form
- modifying agent
- gypsum
- alpha
- form modifying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
- C04B11/02—Methods and apparatus for dehydrating gypsum
Abstract
A method for A method for preparing high-strength alpha-hemihydrate gypsum with desulfurated dihydrate gypsum comprises the following steps: desulfurated dihydrate gypsum in an electric power plant is weighted and is mixed with water to form paste, the concentration of the paste ranges from 10% to 50%; then, a crystalline form modifying agent is added in the paste, and one of the following crystalline form modifying agents, such as butane diacid, sodium succinate or magnesium succinate is adopted; the mixing amount of the modifying agent is 0.05 to 0.08 per thousand of the quantity of the desulfurated dihydrate gypsum; the paste, in which the crystalline form modifying agent is added, is heated to 120 to 160 DEG C, and the heat is preserved for 1 to 4 hours, therefore, alpha-hemihydrate gypsum paste is obtained; the alpha-hemihydrate gypsum paste, the temperature of which is at least 90 DEG C, is treated with centrifugal dewatering or vacuum dewatering under the condition of at least 90 DEG C; and finally, the alpha-hemihydrate gypsum paste is baked in a drying plant with the temperature of 120 to 150 DEG C.
Description
Technical field
The invention belongs to the material of construction technology of preparing, be specifically related to a kind of method for preparing high-strength alpha-type semi-hydrated gypsum with flue gas desulfurization gypsum.
Background technology
The waste of producing when desulfurated plaster is heat power plant's flue gas desulfurization as not being used, can form secondary environmental pollution.Desulfurated plaster is a kind of useful industrial resource, still lacks effectively comprehensive utilization at present.Desulfurated plaster is made full use of, have net effects such as energy-saving and environmental protection, the production energy consumption of gypsum is 1/3 of a lime, be 1/4 of cement, and heat conduction yarn number is lower, has heat insulation effect and " respiratory function ", can also prevent fires, be best green, energy-saving and environmental protection, healthy materials for wall.
Domestic desulfurated plaster is mainly produced beta-type semi-hydrated gypsum (being plaster of Paris), does ultimate compression strength below 15MPa, does not also find to produce with desulfurated plaster the report and the patented technology of high-strength alpha-type half water high strength gypsum at present.
Summary of the invention
The invention provides and a kind ofly prepare the method for alpha semi-hydrated gypsum with the desulfurization dihydrate gypsum, this method can make its alpha semi-hydrated gypsum that makes have the advantage of high compressive strength.
The present invention adopts following technical scheme:
A kind of method for preparing alpha semi-hydrated gypsum with the desulfurization dihydrate gypsum:
Step 1: power taking factory desulfurization dihydrate gypsum, and the power plant desulfurization dihydrate gypsum mixed with water form slip, this pulp density adds the crystalline form modifying agent again in slip between 10%～50%, and described crystalline form modifying agent adopts one of following crystalline form modifying agent:
1. the crystalline form modifying agent is Succinic Acid, Soduxin or Succinic Acid magnesium, and volume is 0.5 ‰～8 ‰ of a desulfurization dihydrate gypsum quality;
2. the crystalline form modifying agent is by a kind of and sal epsom in Succinic Acid, Soduxin and the Succinic Acid magnesium and a kind of composite the forming in the Tai-Ace S 150, and both mass ratioes of front and back are 1: 2～5, and the volume of described crystalline form modifying agent is 5 ‰～10 ‰ of a desulfurization dihydrate gypsum quality;
3. the crystalline form modifying agent is by oxysuccinic acid and sal epsom or oxysuccinic acid and Tai-Ace S 150 is composite forms, and the oxysuccinic acid volume is 1 ‰～6 ‰ of a desulfurization dihydrate gypsum quality, and sal epsom or Tai-Ace S 150 volume are 3 ‰～10 ‰ of desulfurization dihydrate gypsum quality,
Step 2: will add slip behind the crystalline form modifying agent and be heated to 120 ℃～160 ℃ and be incubated 1h～4h, and obtain the alpha semi-hydrated gypsum slip;
The alpha semi-hydrated gypsum slip that temperature is not less than 90 ℃ carries out centrifuge dehydration or vacuum hydro-extraction under the condition of this temperature; In 120 ℃～150 ℃ drying plant, dry at last, promptly obtain the powdered high-strength alpha-type semi-hydrated gypsum without grinding.
Compared with prior art, the present invention mixes the crystalline form modifying agent of trace, the crystal habit of alpha semi-hydrated gypsum is grown towards desirable short cylinder direction, reach the ultimate compression strength that improves semi-hydrated gypsum, make the semi-hydrated gypsum that makes by the present invention have the high advantage of ultimate compression strength.
Description of drawings
Fig. 1 is the present invention with 0.2% Succinic Acid is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes.
Fig. 2 is that the present invention is the crystalline form modifying agent with 0.2% Soduxin
Fig. 3 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with (0.1% Succinic Acid+0.2% Tai-Ace S 150).
Fig. 4 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with (0.1% Succinic Acid magnesium+0.5% Tai-Ace S 150).
Fig. 5 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with 0.25% oxysuccinic acid.
Fig. 6 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with 1.5% Tai-Ace S 150.
Fig. 7 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with 0.2% magnesium citrate.
Fig. 8 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with (0.1% magnesium citrate+0.5% sal epsom).
Fig. 9 is that the present invention is the alpha semi-hydrated gypsum of crystalline form modifying agent preparation, the crystal microgram under 200 times of opticmicroscopes with (0.2% Trisodium Citrate+0.5% Tai-Ace S 150).
Embodiment
Embodiment 1:
A kind of method for preparing high-strength alpha-type semi-hydrated gypsum with the desulfurization dihydrate gypsum:
Step 1: power taking factory desulfurization dihydrate gypsum, and the power plant desulfurization dihydrate gypsum mixed with water form slip, this pulp density is between 10%～50%, in the present embodiment, pulp density is 10%, 50%, 17%, 32% or 45%, add the crystalline form modifying agent again in slip, described crystalline form modifying agent adopts one of following crystalline form modifying agent:
1. the crystalline form modifying agent is Succinic Acid, Soduxin or Succinic Acid magnesium, and volume is 0.5 ‰～8 ‰ of a desulfurization dihydrate gypsum quality, and for example: volume is 0.5 ‰, 8 ‰, 0.9 ‰, 3 ‰ or 7 ‰ of a desulfurization dihydrate gypsum quality;
2. the crystalline form modifying agent is by a kind of and sal epsom in Succinic Acid, Soduxin and the Succinic Acid magnesium and a kind of composite the forming in the Tai-Ace S 150, both mass ratioes of front and back are 1: 2～5 (can select 1: 2,1: 5,1: 3.2 or 1: 4.5), the volume of described crystalline form modifying agent is 5 ‰～10 ‰ of a desulfurization dihydrate gypsum quality, in the present embodiment, the volume of crystalline form modifying agent is 5 ‰, 10 ‰, 6.7 ‰, 8 ‰ or 9 ‰ of a desulfurization dihydrate gypsum quality;
3. the crystalline form modifying agent is by oxysuccinic acid and sal epsom or oxysuccinic acid and Tai-Ace S 150 is composite forms, the oxysuccinic acid volume is 1 ‰～6 ‰ of a desulfurization dihydrate gypsum quality, sal epsom or Tai-Ace S 150 volume are 3 ‰～10 ‰ of desulfurization dihydrate gypsum quality, in the present embodiment, the oxysuccinic acid volume is 1 ‰, 6 ‰, 2.3 ‰, 4 ‰ or 5.8 ‰ of a desulfurization dihydrate gypsum quality, and sal epsom or Tai-Ace S 150 volume are 3 ‰, 10 ‰, 5 ‰, 7.9 ‰ or 9 ‰ of desulfurization dihydrate gypsum quality;
Step 2: will add slip behind the crystalline form modifying agent be heated to 120 ℃～160 ℃ and be incubated 1h～4h (for example: slip be heated to 120 ℃ and be incubated 4h, slip be heated to 145 ℃ and be incubated 2.4h or slip be heated to 160 ℃ and be incubated 1h), obtain the alpha semi-hydrated gypsum slip;
The alpha semi-hydrated gypsum slip that temperature is not less than 90 ℃ carries out centrifuge dehydration or vacuum hydro-extraction under the condition of this temperature; In 120 ℃～150 ℃ drying plant, dry at last, promptly obtain the powdered high-strength alpha-type semi-hydrated gypsum without grinding.
The rotating speed of above-mentioned centrifuge dehydration can be 2500 rev/mins, 3000 rev/mins or 3600 rev/mins; The vacuum tightness of vacuum hydro-extraction is 450mmHg, 500mmHg or 650mmHg, and centrifugal or vacuum hydro-extraction is 90 ℃～120 ℃, specifically may be selected to be 90 ℃, 105 ℃ or 120 ℃.
Embodiment 2
Main technique scheme of the present invention is:
1. earlier power plant desulfurization dihydrate gypsum raw material, crystalline form modifying agent and water metering are mixed with certain density slip, get to shurry pump in the autoclave of outer heating, start agitator simultaneously and open steam valve, give the autoclave heat temperature raising.
When 2. autoclave is warmed up to 105 ℃ of left and right sides, open purging valve, the venting air continues to be warmed up to the temperature of requirement, remains to the time of setting.
3. after constant temperature finishes, open the purging valve venting, when the still internal pressure drops in the 0.1MPa, be put in the insulation storage tank alpha-semi water plaster stone slip in the autoclave standby.
4. according to the requirement of article of manufacture speed, the slip in the insulation storage tank is put into whizzer (or vacuum hydroextractor) dehydration, and dry immediately.
The high-strength alpha-type desulfurization semi-hydrated gypsum for preparing by the present invention.The material of prepared alpha semi-hydrated gypsum and the embodiment of performance list among table 1 and Fig. 1～Fig. 9.
The preparation of table 1 alpha semi-hydrated gypsum and performance
| Sequence number | Crystalline form modifying agent (quality ‰) | Pulp density (%) | Thermostat temperature (℃) | Do ultimate compression strength (MPa) | Crystal habit |
| 1 | Succinic Acid 2 | 40 | 145 | 40.1 | Fig. 1 short cylinder |
| 2 | Soduxin 2 | 30 | 145 | 48.5 | Fig. 2 six sides are granular |
| 3 | Succinic Acid 1+ Tai-Ace S 150 2 | 30 | 145 | 60.7 | Fig. 3 short cylinder |
| 4 | Succinic Acid magnesium 1+ Tai-Ace S 150 5 | 30 | 145 | 54.4 | Fig. 4 short cylinder |
| 5 | Oxysuccinic acid 2.5 | 20 | 150 | 40.5 | Fig. 5 short cylinder |
| 6 | Magnesium citrate 2 | 20 | 150 | 15.6 | Fig. 6 is long bar-shaped |
| 7 | Magnesium citrate 1+sal epsom 5 | 30 | 140 | 18.5 | Fig. 7 needle-like |
| 8 | Trisodium Citrate 2+Tai-Ace S 150 5 | 30 | 140 | 11.3 | Fig. 8 needle-like |
| 9 | Do not mix the crystalline form modifying agent | 20 | 145 | 10.4 | Fig. 9 is fibrous |
Interpretation:
The alpha semi-hydrated gypsum that the present invention adopts power plant desulfurization dihydrate gypsum feedstock production to obtain, the results are shown in Table 1, for the ease of investigating the variation of alpha-semi water plaster stone crystalline form under the effect of various crystalline form modifying agent, it is observed and take pictures with 200 times of opticmicroscopes, the results are shown among table 1 and Fig. 1～Fig. 9.Respectively organize the performance of alpha-semi water plaster stone in the comparative examples, be analyzed as follows by table 1 and Fig. 1～Fig. 9:
1. not (Fig. 9) during admixture crystalline form modifying agent, the alpha semi-hydrated gypsum crystal habit is fibrous, ultimate compression strength is lower, has only 10.4MPa;
2. citric acid (salt) is singly mixed or when being mixed for to the crystalline form modifying agent again with sal epsom, Tai-Ace S 150 (Fig. 6, Fig. 7, Fig. 8), and it is bad to change brilliant effect, and crystal habit is generally needle-like or long bar-shaped; Ultimate compression strength is lower, in 20MPa;
3. be the crystalline form modifying agent with Succinic Acid, oxysuccinic acid, the high-strength alpha-type semi-hydrated gypsum of preparation is that short cylinder (Fig. 1, Fig. 5) ultimate compression strength is higher, is respectively 40.0MPa and 40.5MPa;
4. be the crystalline form modifying agent with the Soduxin, the high-strength alpha-type semi-hydrated gypsum of preparation is six sides granular (Fig. 2), and ultimate compression strength is higher, is 48.5MPa;
5. be the crystalline form modifying agent with Succinic Acid and Tai-Ace S 150, Succinic Acid magnesium and Tai-Ace S 150, the high-strength alpha-half hydrated gypsum of preparation is short cylinder (Fig. 3, Fig. 4), and ultimate compression strength is very high, is 55.4MPa and 60.7MPa;
A large number of experiments show that under processing parameter condition of the present invention, adopt that Succinic Acid (salt) is singly mixed or mixed again with Tai-Ace S 150 (magnesium), when oxysuccinic acid and Tai-Ace S 150 list are mixed or mixed again, crystal habit is that short cylinder or six sides are granular, can both obtain very high ultimate compression strength.Crystal habit is short cylinder, and six sides are granular to be the prerequisite that obtains advantages of higher compressive strength.
The desulfurization dihydrate gypsum waste material that the present invention discharges when utilizing heat power plant's desulfurization, the high-strength alpha-type semi-hydrated gypsum of preparation can be applicable to body of wall gypsum insulation mortar, lightweight body of wall gypsum insulation building block, gypsum sheet material and plaster of Paris decorated articles etc.
Claims (1)
1. one kind prepares the method for high-strength alpha-type semi-hydrated gypsum with the desulfurization dihydrate gypsum, it is characterized in that:
Step 1: power taking factory desulfurization dihydrate gypsum, and the power plant desulfurization dihydrate gypsum mixed with water form slip, this pulp density adds the crystalline form modifying agent again in slip between 10%～50%, and described crystalline form modifying agent adopts one of following crystalline form modifying agent:
1. the crystalline form modifying agent is Succinic Acid, Soduxin or Succinic Acid magnesium, and volume is 0.5 ‰～8 ‰ of a desulfurization dihydrate gypsum quality;
2. the crystalline form modifying agent is by a kind of and sal epsom in Succinic Acid, Soduxin and the Succinic Acid magnesium and a kind of composite the forming in the Tai-Ace S 150, and both mass ratioes of front and back are 1: 2～5, and the volume of described crystalline form modifying agent is 5 ‰～10 ‰ of a desulfurization dihydrate gypsum quality;
3. the crystalline form modifying agent is by oxysuccinic acid and sal epsom or oxysuccinic acid and Tai-Ace S 150 is composite forms, and the oxysuccinic acid volume is 1 ‰～6 ‰ of a desulfurization dihydrate gypsum quality, and sal epsom or Tai-Ace S 150 volume are 3 ‰～10 ‰ of desulfurization dihydrate gypsum quality;
Step 2: will add slip behind the crystalline form modifying agent and be heated to 120 ℃～160 ℃ and be incubated 1h～4h, and obtain the alpha semi-hydrated gypsum slip;
The alpha semi-hydrated gypsum slip that temperature is not less than 90 ℃ carries out centrifuge dehydration or vacuum hydro-extraction under the condition of this temperature; At last, in 120 ℃～150 ℃ drying plant, dry, promptly obtain the powdered high-strength alpha-type semi-hydrated gypsum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100228421A CN101372404B (en) | 2008-07-24 | 2008-07-24 | Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100228421A CN101372404B (en) | 2008-07-24 | 2008-07-24 | Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101372404A CN101372404A (en) | 2009-02-25 |
| CN101372404B true CN101372404B (en) | 2010-08-11 |
Family
ID=40446812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100228421A Expired - Fee Related CN101372404B (en) | 2008-07-24 | 2008-07-24 | Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101372404B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8529863B2 (en) * | 2008-07-31 | 2013-09-10 | Yoshino Gypsum Co., Ltd. | Process for continuous modification of dihydrate gypsum and modified dihydrate gypsum obtained by the process |
| CN102745923B (en) * | 2011-04-22 | 2015-08-19 | 北京建筑材料科学研究总院有限公司 | A kind of processing method utilizing industry by-product gypsum to produce alpha semi-hydrated gypsum |
| CN105217675B (en) * | 2015-10-16 | 2017-04-12 | 湖南省小尹无忌环境能源科技开发有限公司 | Method for preparing alpha-semi-hydrated gypsum through beta-semi-hydrated gypsum recrystallization |
| CN106242465B (en) * | 2016-07-29 | 2018-05-08 | 西南科技大学 | A kind of preparation method of nanometer of high strength gypsum 3D printing material |
| CN106316320B (en) * | 2016-08-18 | 2019-02-19 | 苏州大乘环保新材有限公司 | A kind of resistance to tidal stencils gypsum base compound insulating material and preparation method thereof |
| CN107973329B (en) * | 2016-10-25 | 2019-11-15 | 北京化工大学 | A kind of short prism-shaped α-half-H 2 O calcium sulphate raw powder's production technology |
-
2008
- 2008-07-24 CN CN2008100228421A patent/CN101372404B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101372404A (en) | 2009-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101372404B (en) | Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum | |
| CN103979878B (en) | A kind of waste residue air-entrained concrete building block and production technology thereof | |
| CN104230280B (en) | Low-shrinkage sludge ceramsite alkali-activated full-slag foam concrete plate and preparation method thereof | |
| CN104496361B (en) | A kind of bamboo ribs-stalk composite wall body material composition and preparation method thereof | |
| CN102910889B (en) | Aerated concrete wall material containing river silt and preparation method thereof | |
| CN101333086B (en) | Method for preparing alpha semi-hydrated gypsum pulp and plaster products by desulphurizing gypsum | |
| CN108147760A (en) | A kind of method for producing Ardealite block | |
| CN105384419B (en) | A kind of preparation method of antibacterial and antimildew function mortar | |
| CN109485278B (en) | Cementing material using coal gangue as raw material and preparation method thereof | |
| CN107021719A (en) | A kind of high-strength energy-saving surface layer brushing gypsum and its preparation technology | |
| CN101817670A (en) | Straw/ash magnesium-oxy-chloride cement hollow slat or hollow building block and preparation method thereof | |
| CN104591612A (en) | Heat-insulating building mortar | |
| CN110511056A (en) | A kind of foam concrete block and preparation method thereof | |
| CN105152610A (en) | Method for modifying raw soil material by utilizing starch residue | |
| CN107253851A (en) | A kind of light-weight insulating brick and preparation method thereof | |
| CN107352887B (en) | Shrinkage-compensating foam concrete for light composite partition board | |
| CN105565736B (en) | A kind of preparation method of anti-ultraviolet function mortar | |
| CN110550921A (en) | anti-cracking autoclaved aerated concrete block and production method thereof | |
| CN104030649B (en) | Production process for high-strength high-volume phosphogypsum baking-free brick | |
| CN107640917A (en) | A kind of preparation method of high intensity foam cement | |
| CN106986663A (en) | A kind of preparation method of foam concrete block | |
| CN102190470A (en) | Dehydrate desulfurated alpha high-strength gypsum based self-leveling mortar and production method thereof | |
| CN108455921A (en) | A kind of preparation method of flyash brick | |
| CN104556896A (en) | High-strength aerocrete building block and preparation method thereof | |
| CN102173618B (en) | Method for producing white cement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20150724 |
|
| EXPY | Termination of patent right or utility model |