CN101134646A - Application process by using chemical calcium sulfate as cement retarder - Google Patents
Application process by using chemical calcium sulfate as cement retarder Download PDFInfo
- Publication number
- CN101134646A CN101134646A CNA2007101375372A CN200710137537A CN101134646A CN 101134646 A CN101134646 A CN 101134646A CN A2007101375372 A CNA2007101375372 A CN A2007101375372A CN 200710137537 A CN200710137537 A CN 200710137537A CN 101134646 A CN101134646 A CN 101134646A
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- China
- Prior art keywords
- chemical gypsum
- gypsum
- chemical
- dry powder
- feed bin
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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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The present invention relates to chemical technology, and is technological process of producing cement retarder with chemical gypsum. The technological process includes the following steps: storing chemical gypsum in a bin, feeding chemical gypsum with one double shaft stirrer and one belt weigher to a blender, adding powder in 10-30 wt% of the chemical gypsum to form mixed material with water content of 12-15 wt%, forming the mixed material in a forming machine, and grinding in a mill. The present invention has mechanical flow production, low investment and other advantages.
Description
" technical field " the present invention relates to chemical technology field, particularly belongs to a kind of utilisation technology technology of utilizing chemical gypsum as cement setting retarder.
What " background technology " chemical gypsum was meant in the chemical process to be produced is the byproduct of main component with CaSO4.2H2O, as the phosphogypsum that obtains when producing phosphoric acid, produce the boron gypsum that boric acid obtains, the lemon dregs gypsum that obtains when producing citric acid, produce the fluorgypsum that hydrofluoric acid obtains, in the coal-fired plant flue gas lime and the desulfurated plaster that obtains after the desulfurization etc.
Along with China's rapid development of economy in recent years, the gypsum resource demand is heightened, the plaster of paris is not because of being renewable resource, day by day exhausted, and on the other hand, China only phosphogypsum annual emissions promptly reaches more than 4,000 ten thousand tons, other chemical gypsum annual emissions amounts to also more than 4,000 ten thousand tons, the year produced quantity that has almost surpassed the plaster of paris, though China is obtaining certain achievement aspect the chemical gypsum development and use in recent years, level of comprehensive utilization is not high, still has every year a large amount of chemical gypsums to can not get effective utilization, or enter river course or overstocked farmland, be very serious to the pollution of environment.
China's cement annual production surpasses 100,000,000 tons, and natural dihydrate gypsum is the requisite raw material of manufacture of cement as cement setting retarder, and addition content is about 5%, and a year consumption plaster of paris is more than 5,000 ten thousand tons.The chemical gypsum main component and the plaster of paris are in full accord, if can replace the plaster of paris to be used for manufacture of cement by vast scale (more than 50%), and its consumption will be considerably beyond plaster of Paris and goods utilization.Before many decades, a lot of cement producer has just launched the research of chemical gypsum and has utilized work, and has obtained certain achievement.But because of chemical gypsum is moist fine powder, free water content reaches 20-25%, as through drying, then is the moulded pottery not yet put in a kiln to bake shape, and mobile extreme difference very easily causes canopy storehouse and stifled paste equipment feeding mouth phenomenon, can't resemble the plaster of paris direct independent vast scale and store and utilize.Present most producer adopts the mode with the blending of plaster of paris small proportion or artificial separately a small amount of admixture, and blending is irregular, influences quality, and hand labor intensity is big, thereby has limited its extensive utilization.It replaces plaster of paris amount also less than 30% to utilize best producer, and can not guarantee continuously normal the utilization.
" summary of the invention " purpose of the present invention promptly is to provide a kind of application art that utilizes chemical gypsum as cement setting retarder, utilizes chemical gypsum to replace the purpose of the plaster of paris as cement setting retarder and automatization interpolation to reach vast scale.
The application art that utilizes chemical gypsum as cement setting retarder disclosed in this invention is characterized in that, may further comprise the steps:
1), utilize shovel loader (1) with sticky shape and the moulded pottery not yet put in a kiln to bake shape chemical gypsum chemical gypsum feed bin (2) of packing into; The blanking Hatch Opening of chemical gypsum feed bin (2) directly is connected with a twin shaft stirrer (3), and this biaxial rneader discharge port is opened big consistent with opening for feed, sticks with paste to avoid stifled; Chemical gypsum through biaxial rneader (3) drops on the weighing belt (4), sends into mixer (5) after metering;
2), with the dry powder dry powder feed bin (6) of packing into, dry powder feed bin outlet down connects metering reamer scale (7); According to chemical gypsum moisture content size, the dry powder that accounts for chemical gypsum 10-30% weight is sent into mixer (5), with chemical gypsum formation batch mixing wherein; Control batch mixing moisture is 12-15%;
3), batch mixing is conveyed into shaper (9) moulding through conveyor (8); It is oval spherical that chemical gypsum after the moulding becomes, and sends in the mill through going into to grind conveyor (10) again.
The application art that utilizes chemical gypsum as cement setting retarder disclosed in this invention, realize mechanized continuous productive process, cancel artificial material loading, and in the interpolation process not with the gypsum blending, have and overlap independently technical process, independent metering and blanking, promptly avoid blending inhomogeneous and influence quality, can adjust proportioning flexibly according to output and quality situation again, at utmost improve the ratio of substituting, reduce cost.The feeding metering system that is adopted can adapt to the chemical gypsum of various water contents and shape, and existing suitable breaking capacity can guarantee unobstructed, the accurate measurement of feeding again.Chemical gypsum has cured moulding before going into mill, water content is suitable, and stifled paste equipment, blanking are smooth and easy.And made full use of the flow process and the space of existing cement production system, technology is simply compact, and Connection between Processes is proper, the equipment mature and reliable, and one-time investment is economized.
" description of drawings " accompanying drawing partly discloses specific embodiments of the invention, does progressive explanation below in conjunction with accompanying drawing.
Accompanying drawing is a process flow diagram of the present invention.
" embodiment " in the embodiment shown in the figures, chemical gypsum feed bin (2) has storing, blanking and broken agitating function concurrently, for anti-scaffold feed bin reserves are designed to 500 tons, be shaped as four rib types, the blanking Hatch Opening directly is connected as a single entity with a twin shaft stirrer (3), this biaxial rneader amputation arc lower housing is a discharge port, and is consistent with the opening for feed aperture.Applicable sticky shape of biaxial rneader and moulded pottery not yet put in a kiln to bake shape chemical gypsum, discharge port are opened the big consistent stifled paste of avoiding with opening for feed.The chemical gypsum that goes out biaxial rneader is sent into mixer (5) after weighing belt (4) metering.This mixer is a biaxial rneader.
In the embodiment shown in the figures, establish two dry powder feed bins (6) and be used for splendid attire dry powder.Described dry powder can select slag powders, flyash, limestone powder according to the kind of raw material sources situation and water produced mud, gather dust gather materials, cement etc. one or more.The addition of dry powder accounts for the 10-30% of chemical gypsum weight, adjusts according to the moisture content size of chemical gypsum, and the moisture of control batch mixing is 12-15%, is next procedure---and the shaper moulding creates conditions.The effective constituent SO of chemical gypsum
3Content is generally more than 50%, as adds its SO of 30% dry powder " dilution "
3Content can satisfy fully and produce the needs (SO that is used for the gypsum of cement still more than 30%
3Generally about 35%, in recent years because of a resource shrinkage is in short supply, grade continues to descend many plaster of paris SO of producer content
3Content even be lower than 30%.) as chemical gypsum SO
3Lower, can on the stock ground, suitable airing reduce moisture, reduce dry powder blending ratio.
Batch mixing is sent into shaper (9) moulding through conveyor (8).Shaper can adopt the moulded coal specific equipment.The granularity of the granularity of moulded coal raw material, viscosity, moisture and chemical gypsum batch mixing, viscosity, moisture basically identical can be used to the chemical gypsum batch mixing is carried out moulding fully.It is oval spherical that chemical gypsum after the moulding becomes, diameter 20-25 millimeter, smooth in appearance, ultimate compression strength can reach the 500N/ ball, freely drop down onto its fall strength of briquette of steel plate by 3 meters eminences〉80% (get 10 single balls and fall, get) greater than 13 millimetre-sized particulate weight percentage with the screening of 13 mm sieve.And the chemical gypsum after the moulding is gone into mill through going into to grind conveyor (10), and institute does not surpass 3 meters through the maximum drop of process procedure, and mixes with other material, has reduced to collide and has destroyed, and can guarantee before the mill not defeated and dispersed, not sticky.
Claims (2)
1. an application art that utilizes chemical gypsum as cement setting retarder is characterized in that, may further comprise the steps:
1), utilize shovel loader (1) with sticky shape and the moulded pottery not yet put in a kiln to bake shape chemical gypsum chemical gypsum feed bin (2) of packing into; The blanking Hatch Opening of chemical gypsum feed bin (2) directly is connected with a twin shaft stirrer (3), and this biaxial rneader discharge port is opened big consistent with opening for feed, sticks with paste to avoid stifled; Chemical gypsum through biaxial rneader (3) drops on the weighing belt (4), sends into mixer (5) after metering;
2), with the dry powder dry powder feed bin (6) of packing into, dry powder feed bin outlet down connects metering reamer scale (7); According to chemical gypsum moisture content size, the dry powder that accounts for chemical gypsum 10-30% weight is sent into mixer (5), with chemical gypsum formation batch mixing wherein; Control batch mixing moisture is 12-15%;
3), batch mixing is conveyed into shaper (9) moulding through conveyor (8); It is oval spherical that chemical gypsum after the moulding becomes, and sends in the mill through going into to grind conveyor (10) again.
2. the application art that utilizes chemical gypsum as cement setting retarder according to claim 1 is characterized in that, described dry powder is meant slag powders, flyash, limestone powder, gather dust gather materials, at least a in the cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101375372A CN101134646A (en) | 2007-07-25 | 2007-07-25 | Application process by using chemical calcium sulfate as cement retarder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101375372A CN101134646A (en) | 2007-07-25 | 2007-07-25 | Application process by using chemical calcium sulfate as cement retarder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101134646A true CN101134646A (en) | 2008-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101375372A Pending CN101134646A (en) | 2007-07-25 | 2007-07-25 | Application process by using chemical calcium sulfate as cement retarder |
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| CN (1) | CN101134646A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615713A (en) * | 2011-01-30 | 2012-08-01 | 泰安泰山石膏科技研究院 | Production technology of continuous plastering gypsum production line, and device thereof |
| CN106830724A (en) * | 2016-12-30 | 2017-06-13 | 安徽省高迪环保股份有限公司 | Retarder and exciting agent that natural dihydrate gypsum makees cement are substituted after phosphogypsum modification |
| CN108609885A (en) * | 2018-05-28 | 2018-10-02 | 四川同庆南风有限责任公司 | A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder |
| CN108890873A (en) * | 2018-06-22 | 2018-11-27 | 宁波北新建材有限公司 | It is a kind of for conveying the mixing system of gypsum powder |
| CN114405424A (en) * | 2021-12-30 | 2022-04-29 | 三一汽车制造有限公司 | Phosphogypsum treatment equipment |
| CN116675457A (en) * | 2023-04-19 | 2023-09-01 | 云南吉麟环保科技有限公司 | Technological method for producing phosphogypsum cement retarder by converting phosphogypsum crystal structure |
-
2007
- 2007-07-25 CN CNA2007101375372A patent/CN101134646A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615713A (en) * | 2011-01-30 | 2012-08-01 | 泰安泰山石膏科技研究院 | Production technology of continuous plastering gypsum production line, and device thereof |
| CN102615713B (en) * | 2011-01-30 | 2016-06-29 | 泰安泰山石膏科技研究院 | The production technology of continuous way brushing gypsum production line and device thereof |
| CN106830724A (en) * | 2016-12-30 | 2017-06-13 | 安徽省高迪环保股份有限公司 | Retarder and exciting agent that natural dihydrate gypsum makees cement are substituted after phosphogypsum modification |
| CN108609885A (en) * | 2018-05-28 | 2018-10-02 | 四川同庆南风有限责任公司 | A method of it solving mirabilite gypsum and feeds intake difficulty as cement retarder |
| CN108609885B (en) * | 2018-05-28 | 2021-03-30 | 四川同庆南风有限责任公司 | Method for solving feeding difficulty of mirabilite gypsum used as cement retarder |
| CN108890873A (en) * | 2018-06-22 | 2018-11-27 | 宁波北新建材有限公司 | It is a kind of for conveying the mixing system of gypsum powder |
| CN114405424A (en) * | 2021-12-30 | 2022-04-29 | 三一汽车制造有限公司 | Phosphogypsum treatment equipment |
| CN116675457A (en) * | 2023-04-19 | 2023-09-01 | 云南吉麟环保科技有限公司 | Technological method for producing phosphogypsum cement retarder by converting phosphogypsum crystal structure |
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