CN104355560B - A kind of production method of α-high strength gypsum powder - Google Patents
A kind of production method of α-high strength gypsum powder Download PDFInfo
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Abstract
The present invention relates to the production method of a kind of α-high strength gypsum powder, step is as follows: the ardealite of butt mass content >=95% is mixed by (1) with water, prepares slip; (2) in slip add crystal modifier, 115～130 DEG C, 0.2～0.55MPa when turn crystalline substance; (3) take off to Free water mass content≤15%, dry under 135～150 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified; (4) material after drying being carried out broken modifiying, after broken, particle size range is between 75～125 microns, sieves the α-high strength gypsum powder obtaining different-grain diameter. The present invention has processed the emission problem of garbage, protects environment, it is achieved the comprehensive utilization of resource; Technique is simple, and α-Gypsum Fibrosum powder intensity is high, quality is good.
Description
Technical field
The invention belongs to shaping glue gel material to produce and field of environmental improvement, relate to a kind of method that ardealite produces α-high strength gypsum powder.
Background technology
High strength gypsum powder has higher intensity (7 days up to 40MPa) and degree of compaction, therefore named high strength gypsum. High strength gypsum powder high-grade gypsum raw material makes, and the natural gypsum being currently mainly used dihydrate gypsum content more than 85% is raw material. Comprehensive utilization in order to realize resource reduces environmental pollution simultaneously, and domestic also beginning gradually produces α-high strength gypsum powder with industrial by-products such as desulfurated plaster, citric acid waste residues or ardealites. But, generation and the index of semi-hydrated gypsum are had bigger adverse effect by ardealite impurities, it is difficult to produce qualified α-high strength gypsum, produce α-high strength gypsum powder so seldom useful at present.
Current China produces the method for α-type high strength gypsum powder mainly autoclave method and liquid phase method. Autoclave method adopts dry method steam pressure dehydration fine grinding again, the shortcoming of this method is that energy consumption is big, properties of product are unstable (owing to temperature is wayward, part semi-hydrated gypsum is further dehydrated into anhydrous gypsum, cause that final products are the mixtures of the semi-hydrated gypsum based on αsemiwatergypsum and dihydrate gypsum and anhydrous gypsum), the raw material adding the employing of this technique is block, dihydrate gypsum dehydration is very incomplete, there is part dihydrate gypsum. The quality of αsemiwatergypsum is had totally unfavorable impact by this.
Liquid phase method produces α-type high strength gypsum technological process advanced person, controls accurately, and it produces and prepares α-type Gypsum Fibrosum intensity height, and the coefficient of expansion is little, and made model can replicate details exactly. Chinese patent literature CN102615694A (application number: 201110032778.7) discloses the technique that a kind of continuous way utilizes chemical gypsum to produce high-strength α Gypsum Fibrosum, it is characterized in that comprising the steps of a, chemical gypsum, water being sufficiently mixed, form stable question response slip; B, the question response slip of step a is mixed with additive, carry out after mixing turning crystalline substance;C, crystalline substance will be turned after slip send into forming machine by centrifugation, through solidification, cutting, dry make gypsum product. The advantage of this patent be can produce continuously, good operational environment, thermal source efficiency height, constant product quality, raw material utilization rate are high, production line production capacity high, require not strict to the free water content of raw material; Shortcoming is that the Gypsum slurry after turning crystalline substance is used directly to production plastering, it is difficult to sell as intermediate products, is unfavorable for the popularization of application.
Summary of the invention
For the deficiencies in the prior art, the production method of a kind of α of the present invention-high strength gypsum powder. The method technique is simple, energy consumption is low, properties of product are stable.
Technical scheme is as follows:
A kind of production method of α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of butt mass content >=95%, preparing solid material proportion is 1200～1400kg/m3Slip;
(2) to step (1) prepare slip in add phosphogypsum quality 1/10000th 3/50000 to ten thousand crystal modifier, 115～130 DEG C, 0.2～0.55MPa when turn brilliant 1.5～2.5 hours, described crystal modifier is citrate and/or alkylsulfonate;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry under 135～150 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, and after broken, particle size range is between 75～125 microns, and screening obtains the α-high strength gypsum powder of different-grain diameter.
The present invention choosing is separated meet granularity requirements, the rational material of gradation adjustment is sent directly into finished bin, sell as finished product or raw material as high-strength mixed powder store; The bulky grain that choosing is got is re-started modified, choosing point, until all materials all meet granularity requirements. In step of the present invention (4), after broken, choosing separates the α-high strength gypsum powder of different-grain diameter grade, according to product demand, by the product gradation adjustment of different-grain diameter grade, can obtain the α-high strength gypsum powder product of different gradation.
According to the invention it is preferred to, the mode of heating that step (2) turns in brilliant process is heat-conducting oil heating, it is further preferred that first conduction oil is heated with high steam, then with the conduction oil after heating, slip is heated.
According to the invention it is preferred to, it is 118～122 DEG C that step (2) turns brilliant temperature, and turning brilliant pressure is 0.25～0.4Mpa.
According to the invention it is preferred to, step (2) turns pressure in brilliant process and adopts the compressed-air actuated mode of addition to be adjusted.
According to the invention it is preferred to, when crystal modifier described in step (2) is two kinds of crystal modifiers, its feed postition adopts disposable for one crystal modifier addition, and another kind of crystal modifier is added by pump according to crystal transformation situation, regulates in real time.
According to the invention it is preferred to, the α of different-grain diameter-high strength gypsum powder is mixed by step (4), obtains the α after corresponding gradation adjustment-high strength gypsum powder product. After different-grain diameter mixing, α-high strength gypsum powder product of obtaining has different initial set, final setting time, can carry out flexible mixing preparation according to product needed.
Produced waste hot steam in other technical processs can be derived from according to the hot blast that the present invention, dehydration and drying course use.
According to the invention it is preferred to, all processing steps realize increasingly automated in combinations with control operation in PLC (programmable logic controller (PLC)).
Ardealite used by the present invention is the using waste phosphorus Gypsum Fibrosum produced in fertilizer process.
The all processing steps of the present invention all can use existing equipment to complete, and not specified process conditions are all by prior art.
The present invention has the following advantages that and beneficial effect:
1, the present invention with produce fertilizer using waste phosphorus Gypsum Fibrosum for raw material, produce high-strength α-Gypsum Fibrosum powder, not only create economic worth, more processed the emission problem of garbage, protect environment, it is achieved the comprehensive utilization of resource.
2, present invention process is simple, and the high-strength α-Gypsum Fibrosum powder of production has intensity height, the measured advantage of matter, and preparing α-Gypsum Fibrosum powder by the present invention is that the gypsum product that base material produces does comprcssive strength at more than 50Mpa.
3, the present invention turns thermal source in brilliant process two steps can be adopted to convert, first with steam, conduction oil is heated, with the conduction oil after heating, slip is heated again, turn brilliant process temperature, pressure stability, turning brilliant ambient stable, outer addition compression air regulates pressure, and can show and turn crystalline substance according to pressure need to regulate at any time pressure in still, thus the conversion of common guarantee crystal is sufficiently stable, complete, thorough, further ensure the stable of product index and high-quality.
4, crystal modifier of the present invention can adopt two kinds of feed postition simultaneously, improves the motility of adjustment on the one hand, it also avoid on the other hand and causes the slip " inefficacy " that first wife is good because not driving for a long time after producing jerk and the loss brought.
5, the tail gas that baking stage of the present invention produces is through udst separation, decreases atmospheric pollution on the one hand, reduces product loss on the other hand, improves raw material availability and productivity effect.
6, the present invention is continuous production processes, can adopt control operation in PLC, and production automation degree is high, and with artificial few, the accuracy of data is high, and feedback in time, is conducive to adjustment and the control of production target.
7, high-strength α-Gypsum Fibrosum powder steady quality that the present invention prepares, can require that blending respective additive makes mixing class Gypsum Fibrosum powder according to the different of final products, adjustable extent is big, and index is stable, it is possible to suitable in the demand of the multiple high-end plasterings such as ceramic female die, hot investment casting, gear division.
Detailed description of the invention
Below by specific embodiment, technical scheme is described further, but institute of the present invention protection domain is not limited to this.
In embodiment, ardealite used is the by-product in nitro fertilizer production process, and its feature of raw material is crystal formation is flake or needle-like.
Ardealite index is as follows:
In embodiment, all processing steps realize increasingly automated in combinations with control operation in PLC (programmable logic controller (PLC)).
Embodiment 1
A kind of production method of α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of 5 tons of butt mass content 96%, preparing solid material proportion is 1200kg/m3Slip;
(2) disposable addition 250g crystal modifier in the slip prepared to step (1), 115 DEG C, 0.2MPa when turn brilliant 1.5 hours, described crystal modifier is citrate;
Mode of heating is for be first heated conduction oil with high steam, then with the conduction oil after heating, slip is heated;
Turning pressure in brilliant process adopts the compressed-air actuated mode of addition to be adjusted;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry 1 hour under 140 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, and choosing separates the material (screen over-size≤3.00%) that granularity is 75 microns, obtains α-high strength gypsum powder.
Taking this batch of product and carry out Indexs measure according to building standard JC/T2038-2010, testing result is as follows:
Embodiment 2
A kind of production method of α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of 5 tons of butt mass content 95%, preparing solid material proportion is 1250kg/m3Slip;
(2) slip prepared to step (1) adds 500g crystal modifier, 118 DEG C, 0.3MPa when turn brilliant 1.8 hours, described crystal modifier is alkylsulfonate;
Mode of heating is for be first heated conduction oil with high steam, then with the conduction oil after heating, slip is heated;
Turning pressure in brilliant process adopts the compressed-air actuated mode of addition to be adjusted;
The feed postition of crystal modifier is added by pump according to crystal transformation situation, regulates in real time;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry 1 hour under 135 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, choosing separates the material (screen over-size≤3.00%) that granularity is 115 microns, carry out gradation adjustment with the material that grain size category is 100 microns (screen over-size≤3.00%) 1:3 in mass ratio, obtain α-high strength gypsum powder.
Taking this batch of product and carry out Indexs measure according to building standard JC/T2038-2010, testing result is as follows:
Embodiment 3
A kind of production method of α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of 5 tons of butt mass content 95%, preparing solid material proportion is 1300kg/m3Slip;
(2) disposable addition 750g crystal modifier in the slip prepared to step (1), 122 DEG C, 0.4MPa when turn brilliant 2 hours, described crystal modifier is alkylsulfonate;
Mode of heating is for be first heated conduction oil with high steam, then with the conduction oil after heating, slip is heated;
Turning pressure in brilliant process adopts the compressed-air actuated mode of addition to be adjusted;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry 1 hour under 145 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, choosing separates the material (screen over-size≤3.00%) that granularity is 125 microns, carry out gradation adjustment with the material that grain size category is 110 microns (screen over-size≤3.00%) 1:5 in mass ratio, obtain α-high strength gypsum powder.
Taking this batch of product and carry out Indexs measure according to building standard JC/T2038-2010, testing result is as follows:
Embodiment 4
A kind of production method of α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of 5 tons of butt mass content 97%, preparing solid material proportion is 1350kg/m3Slip;
(2) slip prepared to step (1) adds 1000g crystal modifier, 126 DEG C, 0.5MPa when turn brilliant 2.2 hours, described crystal modifier is citrate;
Mode of heating is for be first heated conduction oil with high steam, then with the conduction oil after heating, slip is heated;
Turning pressure in brilliant process adopts the compressed-air actuated mode of addition to be adjusted;
The feed postition of crystal modifier is added by pump according to crystal transformation situation, regulates in real time;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry 1 hour under 150 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, choosing separates the material (screen over-size≤3.00%) that granularity is 100 microns, carry out gradation adjustment with the material that grain size category is 80 microns (screen over-size≤3.00%) 1:9 in mass ratio, obtain α-high strength gypsum powder.
Taking this batch of product and carry out Indexs measure according to building standard JC/T2038-2010, testing result is as follows:
Embodiment 5
A kind of production method of α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of 5 tons of butt mass content 95%, preparing solid material proportion is 1400kg/m3Slip;
(2) disposable addition 1500g crystal modifier in the slip prepared to step (1), 122 DEG C, 0.4MPa when turn brilliant 2.5 hours, described crystal modifier is alkylsulfonate;
Mode of heating is for be first heated conduction oil with high steam, then with the conduction oil after heating, slip is heated;
Turning pressure in brilliant process adopts the compressed-air actuated mode of addition to be adjusted;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry 1 hour under 140 DEG C of conditions; The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, choosing separates the material (screen over-size≤3.00%) that granularity is 90 microns, carry out gradation adjustment with the material that grain size category is 75 microns (screen over-size≤3.00%) 1:6 in mass ratio, obtain α-high strength gypsum powder.
Taking this batch of product and carry out Indexs measure according to building standard JC/T2038-2010, testing result is as follows:
Claims (5)
1. a production method for α-high strength gypsum powder, step is as follows:
(1) being mixed with water by the ardealite of butt mass content >=95%, preparing solid material proportion is 1200 ~ 1400kg/m3Slip;
(2) slip prepared to step (1) adds the crystal modifier of phosphogypsum quality 1/10000th 3/50000 to ten thousand, 115 ~ 130 DEG C, 0.2 ~ 0.55MPa when turn brilliant 1.5 ~ 2.5 hours, described crystal modifier is citrate and/or alkylsulfonate;
The mode of heating turned in brilliant process is heat-conducting oil heating, first with high steam, conduction oil is heated, then with the conduction oil after heating, slip is heated;
Turning pressure in brilliant process adopts the compressed-air actuated mode of addition to be adjusted;
(3) material that step (2) prepares is taken off to Free water mass content≤15%, dry under 135 ~ 150 DEG C of conditions;
The tail gas clean-up dedusting that will produce in drying course, the steam discharge air after purifying and dedusting, the mixing of materials after entering into step (4) after dust collection and drying is broken modified;
(4) material after step (3) being dried carries out broken modified, and after broken, particle size range is between 75 ~ 125 microns, and screening obtains the α-high strength gypsum powder of different-grain diameter.
2. the production method of α according to claim 1-high strength gypsum powder, it is characterised in that it is 118 ~ 122 DEG C that step (2) turns brilliant temperature.
3. the production method of α according to claim 1-high strength gypsum powder, it is characterised in that it is 0.25 ~ 0.4MPa that step (2) turns brilliant pressure.
4. the production method of α according to claim 1-high strength gypsum powder, it is characterized in that, when crystal modifier described in step (2) is two kinds of crystal modifiers, its feed postition adopts disposable for one crystal modifier addition, another kind of crystal modifier is added by pump according to crystal transformation situation, regulates in real time.
5. the production method of α according to claim 1-high strength gypsum powder, it is characterised in that mixed by the α of different-grain diameter-high strength gypsum powder in step (4), obtains the α-high strength gypsum powder of corresponding grating.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2690358C1 (en) * | 2015-09-18 | 2019-05-31 | Кинджента Норстерра Кемикал Ко., Лтд. | Method for production of extraction phosphoric acid with obtained as by-product of alpha-hemihydrate gypsum and alpha-semi-aqueous gypsum with high degree of purity and high degree of whiteness |
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| CN105253867B (en) * | 2015-09-18 | 2017-10-17 | 金正大生态工程集团股份有限公司 | A kind of production method of phosphoric acid by wet process by-product αsemiwatergypsum |
| CN107487995B (en) * | 2016-06-12 | 2020-10-02 | 湖北远固新型建材科技股份有限公司 | Method for preparing alpha-type high-strength gypsum by using phosphogypsum |
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| CN113087423B (en) * | 2021-04-22 | 2022-09-06 | 深圳市青青源科技有限公司 | Method for preparing ultrahigh-strength gypsum powder by using natural gypsum under constant pressure |
| CN114538811A (en) * | 2021-11-12 | 2022-05-27 | 天宝动物营养科技股份有限公司 | Method for preparing high-strength gypsum from phosphogypsum |
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| JPH0686293B2 (en) * | 1987-05-06 | 1994-11-02 | 三菱重工業株式会社 | Method for producing α-type hemihydrate gypsum |
| JPH1192142A (en) * | 1997-09-24 | 1999-04-06 | Noritake Co Ltd | Production of alpha-gypsum hemihydrate |
| CN100345788C (en) * | 2006-01-10 | 2007-10-31 | 南京一夫建材实业有限公司 | Alpha type high-strength gypsum and its preparation method |
| CN101058488A (en) * | 2007-04-10 | 2007-10-24 | 山东金信新型建材有限公司 | Process for producing alpha gypsum powder by liquid phase method |
| CN201648247U (en) * | 2010-01-28 | 2010-11-24 | 赵云龙 | Equipment using desulfurized gypsum, phosphogypsum or citric acid gypsum to produce alpha-gypsum |
| EP2418184B2 (en) * | 2010-08-12 | 2021-02-17 | Lindner GFT GmbH | Method for manufacturing alpha-calcium sulphate hemi-hydrate |
| CN102936106A (en) * | 2012-12-12 | 2013-02-20 | 宁夏博得石膏科技有限公司 | Method for producing alpha gypsum by utilizing various dihydrate gypsums |
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| RU2690358C1 (en) * | 2015-09-18 | 2019-05-31 | Кинджента Норстерра Кемикал Ко., Лтд. | Method for production of extraction phosphoric acid with obtained as by-product of alpha-hemihydrate gypsum and alpha-semi-aqueous gypsum with high degree of purity and high degree of whiteness |
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