CN1532164A - Method for producing building gypsum powder using phosphrus gypsum - Google Patents
Method for producing building gypsum powder using phosphrus gypsum Download PDFInfo
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- CN1532164A CN1532164A CNA031081118A CN03108111A CN1532164A CN 1532164 A CN1532164 A CN 1532164A CN A031081118 A CNA031081118 A CN A031081118A CN 03108111 A CN03108111 A CN 03108111A CN 1532164 A CN1532164 A CN 1532164A
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- calcinate
- citric acid
- phosphogypsum
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/143—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The production process of building gypsum powder with ardealite, the side product of wet phosphoric acid production process, as material includes fast dewatering in stoving machine to obtain half-hydrated gypsum product, adding citric acid or sodium citrate, and pulverizing to decrease the medium size D50 value to 0.7 time the original value. The building gypsum powder product has pre-hardening time, fracture strength and compression strength meeting the requirement of national standard GB9776-88, and may be used to replace natural gypsum. The present invention can utilize ardealite effectively and protect environment.
Description
Technical field
The present invention relates to the method with phosphogypsum producing building gypsum, specifically a kind of phosphogypsum the calcining by elevated temperature heat gas carried out the method that fast dewatering is produced plaster of Paris.
Background technology
Phosphogypsum is the waste that produces in the Wet-process Phosphoric Acid Production process, and its quantity discharged is very big, is 5 times of phosphoric acid output, poses a big pressure not only for the stacking of manufacturing enterprise, and contaminate environment.Therefore how a large amount of processing and utilizing phosphogypsums are difficult problems that need to be resolved hurrily.
Because phosphogypsum and plaster of paris main component all are terra alba, therefore, mainly concentrate on the substitute that the phosphogypsum processing treatment becomes the plaster of paris at utilization research of phosphogypsum.External main research at present be to utilize phosphogypsum to produce plastering, its technology is: phosphogypsum washes with water, dry again, calcining, grinds, and adds water at last and additive is made plastering.Terra alba after the processing only as intermediates, need not reach standard-required to the presetting period, only need satisfy processing conditions and get final product.The domestic producer that has produces semi-hydrated gypsum with phosphogypsum, and further make plasterboard and building block, main technique is: with phosphogypsum Jia Shui, add that crystal formation agent, admixture are soaked, crystallization, purification, separation, carry out drying again, calcining removes free-water and partial crystallization water makes the mixture that contains semi-hydrated gypsum, add an amount of adjustable solidification agent and water again and make plastering.The problem that domestic and international existing technology mainly exists is: 1, often adopt revolution frying pan dewatering process at a slow speed, production capacity is low, is difficult to scale operation; 2, technical process is long, and investment is big, the energy consumption height, and production cost height, and owing to increase washing procedure has 20 ~ 30% phosphogypsum to be taken away by water, and the mud intractable of formation causes secondary pollution.
Also occurred at present the phosphogypsum raw material is not washed with water and utilizes dryer to carry out fast dewatering method, be called as publishing one piece that " phosphate fertilizer and multiple fertilizer " magazine 62-63 page or leaf delivers November calendar year 2001 and introduced a kind of phosphogypsum raw material calcining in " the novel calcining furnace of phosphogypsum--Shi dryer " article in the hammer dryer and carry out the method that fast dewatering is produced terra alba with high-temperature flue gas, phosphogypsum raw material and high-temperature flue gas are directly sent in the dryer, tup is broken up phosphogypsum with the heat exchange of high-temperature flue gas thorough mixing and is calcined, separate the calcinate obtain containing semi-hydrated gypsum through bagroom, enter the finished product stabilizer again and make building gypsum plaster transition.Flow fast in dryer and drying tube because air-flow carries phosphogypsum, the processing power of equipment is big, the processing efficiency height, and energy consumption is low, is applicable to extensive processing.But, because phosphogypsum residence time in this dryer is short, short with the duration of contact of gas, usually has only the several seconds, thereby make phosphogypsum dehydration inhomogeneous, the content of semi-hydrated gypsum is not high, the calcinate terra alba not only its presetting period fast, and bending and compressive strength is low, can not satisfy the requirement of building gypsum plaster standard GB 9776-88.
Summary of the invention
Problem to be solved by this invention be above-mentioned fast dewatering building gypsum plaster presetting period of producing fast, bending and compressive strength is low, does not reach the problem of plaster of Paris standard-required.
A kind of method of the present invention with phosphogypsum producing building terra alba, with the wet process phosphoric acid by-product phosphogypsum is raw material, carry out the calcinate that fast dewatering method obtains containing semi-hydrated gypsum by the above-mentioned dryer that utilizes, in calcinate, add additive, below 0.7 times of calcinate particle meso-position radius D50 value before the particle meso-position radius D50 value of product is reduced to grinding after grinding extremely grinds is again made building gypsum plaster.
Described additive contains citric acid or Trisodium Citrate.
When additive was citric acid, addition was the 0.1-0.3% of calcinate weight.
When additive was Trisodium Citrate, addition was the 0.15-0.4% of calcinate weight.
Additive is the mixture of citric acid, Trisodium Citrate, citric acid, Trisodium Citrate in proportion 1: the 0.2-5 preparation, addition is the 0.2-0.4% of calcinate weight.
In order to improve the content of semi-hydrated gypsum and dehydrated gyp-in the calcinate, the gas flow temperature during with gas solid separation is controlled at 150-170 ℃.
Gas flow temperature during gas solid separation is in the time of 150-160 ℃, and the citric acid addition is preferably the 0.1-0.22% of calcinate weight.Gas flow temperature during gas solid separation is in the time of 160-170 ℃, and the citric acid addition is preferably the 0.15-0.3% of calcinate weight.
Fig. 1-3 for the calcinates that separate down to obtain at 160 ℃ when adding the different ratios additive folding strength with grinding degree change curve.As can be seen from the figure, folding strength strengthens with the grinding degree, and during 0.7 times of the particle meso-position radius D50 value before calcinate particle meso-position radius D50 value is reduced to grinding behind the grinding, its folding strength significantly improves, reach 1.8Mpa, can satisfy the national standard requirement of plaster of Paris.
Because the present invention is by the selection to gas solid separation temperature, additive capacity and grinding degree, prolong the presetting period of terra alba greatly, presetting period was reached more than 6 minutes, and improved the bending and compressive strength of gypsum greatly, make its requirement that meets building gypsum plaster standard GB 9776-88, can substitute the plaster of paris and use as building gypsum plaster; The dehydration of employing quick burning, production capacity is big, and technical process is short, and energy consumption is low, is fit to large-scale industrialization production, can effectively utilize phosphogypsum, solves industrial residue preferably, the protection environment.
Description of drawings
Fig. 1-3 for the calcinates that separate down to obtain at 160 ℃ when adding the different ratios additive folding strength with grinding degree change curve.
Embodiment
Embodiment 1: the phosphogypsum of phosphoric acid by wet process by-product and 400-700 ℃ high-temperature flue gas are sent in the dryer, phosphogypsum and high-temperature gas thorough mixing in dryer carries out calcined dehydration, delivering to bagroom with air-flow separates, the gas flow temperature of bagroom inlet is controlled at 150-160 ℃, the calcinate that bagroom is collected is delivered to grinding machine, in grinding machine, add simultaneously additive citric acid, the addition of citric acid is the 0.1-0.22% of calcinate weight, make the D50 value of product behind the grinding be reduced to 0.7 times of calcinate D50 value before the grinding, make building gypsum plaster.Product after testing, its presetting period, final setting time was less than 30 minutes greater than 6 minutes, folding strength is greater than 1.8Mpa, ultimate compression strength reaches the requirement of building gypsum plaster standard GB 9776-88 greater than 3.0Mpa.
Embodiment 2: the method for pressing embodiment 1, make the D50 value of product behind the grinding be reduced to 0.65 times of calcinate D50 value before the grinding, the presetting period of the building gypsum plaster that makes was greater than 6 minutes, final setting time was less than 30 minutes, folding strength is greater than 2.0Mpa, ultimate compression strength reaches the requirement of building gypsum plaster standard GB 9776-88 greater than 3.2Mpa.
Embodiment 3: the method for pressing embodiment 1, wherein the gas flow temperature of bagroom inlet is controlled at 160-170 ℃, the additive that adds to grinding machine is a citric acid, addition is the 0.15-0.3% of calcinate weight, the building gypsum plaster that makes, and its presetting period is greater than 6 minutes, final setting time was less than 30 minutes, folding strength is greater than 1.8Mpa, and ultimate compression strength reaches the requirement of building gypsum plaster standard GB 9776-88 greater than 3.0Mpa.
Embodiment 4: the method for pressing embodiment 1, wherein the gas flow temperature of bagroom inlet is controlled at 150-170 ℃, the additive that adds to grinding machine is a Trisodium Citrate, its addition is the 0.15-0.4% of calcinate weight, the presetting period of the building gypsum plaster that makes, final setting time was less than 30 minutes greater than 6 minutes, and folding strength is greater than 1.8Mpa, ultimate compression strength reaches the requirement of building gypsum plaster standard GB 9776-88 greater than 3.0Mpa.
Embodiment 5: the method for pressing embodiment 1, wherein the gas flow temperature of bagroom inlet is controlled at 150-170 ℃, the additive that adds to grinding machine is the mixture of citric acid and Trisodium Citrate, citric acid, Trisodium Citrate in proportion 1: 0.2-5 preparation, addition is the 0.2-0.4% of calcinate weight, the building gypsum plaster that makes, its presetting period was greater than 6 minutes, final setting time was less than 30 minutes, folding strength is greater than 1.8Mpa, ultimate compression strength reaches the requirement of building gypsum plaster standard GB 9776-88 greater than 3.0Mpa.
Claims (8)
1, a kind of method with phosphogypsum producing building terra alba, with the wet process phosphoric acid by-product phosphogypsum is raw material, in dryer, carry out the quick burning dehydration with hot gas and phosphogypsum, obtain containing the calcinate of semi-hydrated gypsum through gas solid separation, it is characterized in that: in calcinate, add additive, and make grinding and handle, make behind the grinding particle meso-position radius D50 value of product reduce to preceding below 0.7 times of calcinate particle meso-position radius D50 value of grinding.
2, method according to claim 1 is characterized in that: described additive contains citric acid or Trisodium Citrate.
3, method according to claim 2 is characterized in that: described additive is a citric acid, and addition is the 0.1-0.3% of calcinate weight.
4, method according to claim 2 is characterized in that: described additive is a Trisodium Citrate, and addition is the 0.15-0.4% of calcinate weight.
5, method according to claim 2 is characterized in that: described additive is the mixture of citric acid, Trisodium Citrate, citric acid, Trisodium Citrate in proportion 1: the 0.2-5 preparation, addition is the 0.2-0.4% of calcinate weight.
6, according to claim 1 or 2 or 3 or 4 or 5 described methods, it is characterized in that: the gas flow temperature during with gas solid separation is controlled at 150-170 ℃.
7, method according to claim 3 is characterized in that: the gas flow temperature during with gas solid separation is controlled at 150-160 ℃, and the citric acid addition is the 0.1-0.22% of calcinate weight.
8, method according to claim 3 is characterized in that: the gas flow temperature during with gas solid separation is controlled at 160-170 ℃, and the citric acid addition is the 0.15-0.3% of calcinate weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108111 CN1226222C (en) | 2003-03-19 | 2003-03-19 | Method for producing building gypsum powder using phosphrus gypsum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03108111 CN1226222C (en) | 2003-03-19 | 2003-03-19 | Method for producing building gypsum powder using phosphrus gypsum |
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| CN1532164A true CN1532164A (en) | 2004-09-29 |
| CN1226222C CN1226222C (en) | 2005-11-09 |
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| CN 03108111 Expired - Fee Related CN1226222C (en) | 2003-03-19 | 2003-03-19 | Method for producing building gypsum powder using phosphrus gypsum |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337959C (en) * | 2005-08-29 | 2007-09-19 | 山东泰和东新股份有限公司 | Novel architecture gypsum powder and its preparation method |
| CN101255024B (en) * | 2008-03-27 | 2010-06-16 | 蚌埠华东石膏有限公司 | Method for producing architectural gypsum by lemon acid gypsum |
| CN101798194B (en) * | 2010-02-08 | 2012-05-30 | 日照金禾博源生化有限公司 | Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster |
| CN103288369A (en) * | 2012-03-04 | 2013-09-11 | 卢杰君 | Edible anhydrite and preparation method thereof |
| CN103936313A (en) * | 2014-05-08 | 2014-07-23 | 瓮福（集团）有限责任公司 | Process for preparing building gypsum powder from phosphogypsum |
| CN106009777A (en) * | 2016-05-12 | 2016-10-12 | 贵州开磷磷石膏综合利用有限公司 | Superfine active anhydrite micro powder and preparation method thereof |
| CN106006695A (en) * | 2016-05-12 | 2016-10-12 | 贵州开磷磷石膏综合利用有限公司 | Preparation method of high-strength composite gypsum micropowder |
| CN106006696A (en) * | 2016-05-12 | 2016-10-12 | 贵州开磷磷石膏综合利用有限公司 | Fabrication method and application of gypsum micro powder |
| CN110218013A (en) * | 2019-06-17 | 2019-09-10 | 长沙紫宸科技开发有限公司 | With the method and apparatus of modified vertical mill system production ardealite building gypsum plaster |
| CN112592145A (en) * | 2020-12-31 | 2021-04-02 | 成都建工赛利混凝土有限公司 | Preparation method of early-strength phosphogypsum expansion mortar |
-
2003
- 2003-03-19 CN CN 03108111 patent/CN1226222C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100337959C (en) * | 2005-08-29 | 2007-09-19 | 山东泰和东新股份有限公司 | Novel architecture gypsum powder and its preparation method |
| CN101255024B (en) * | 2008-03-27 | 2010-06-16 | 蚌埠华东石膏有限公司 | Method for producing architectural gypsum by lemon acid gypsum |
| CN101798194B (en) * | 2010-02-08 | 2012-05-30 | 日照金禾博源生化有限公司 | Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster |
| CN103288369A (en) * | 2012-03-04 | 2013-09-11 | 卢杰君 | Edible anhydrite and preparation method thereof |
| CN103936313A (en) * | 2014-05-08 | 2014-07-23 | 瓮福（集团）有限责任公司 | Process for preparing building gypsum powder from phosphogypsum |
| CN103936313B (en) * | 2014-05-08 | 2015-09-30 | 瓮福（集团）有限责任公司 | The technique of building gypsum plaster prepared by a kind of phosphogypsum |
| CN106009777A (en) * | 2016-05-12 | 2016-10-12 | 贵州开磷磷石膏综合利用有限公司 | Superfine active anhydrite micro powder and preparation method thereof |
| CN106006695A (en) * | 2016-05-12 | 2016-10-12 | 贵州开磷磷石膏综合利用有限公司 | Preparation method of high-strength composite gypsum micropowder |
| CN106006696A (en) * | 2016-05-12 | 2016-10-12 | 贵州开磷磷石膏综合利用有限公司 | Fabrication method and application of gypsum micro powder |
| CN106006695B (en) * | 2016-05-12 | 2019-03-05 | 贵州开磷磷石膏综合利用有限公司 | A kind of high-strength composite Gypsum Fibrosum micropowder preparation method |
| CN110218013A (en) * | 2019-06-17 | 2019-09-10 | 长沙紫宸科技开发有限公司 | With the method and apparatus of modified vertical mill system production ardealite building gypsum plaster |
| CN110218013B (en) * | 2019-06-17 | 2021-12-31 | 长沙紫宸科技开发有限公司 | Method and equipment for producing phosphogypsum building gypsum powder by using improved vertical mill system |
| CN112592145A (en) * | 2020-12-31 | 2021-04-02 | 成都建工赛利混凝土有限公司 | Preparation method of early-strength phosphogypsum expansion mortar |
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| Publication number | Publication date |
|---|---|
| CN1226222C (en) | 2005-11-09 |
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Granted publication date: 20051109 Termination date: 20100319 |