CN111807736A - Desulfurization calcined gypsum processing technology - Google Patents
Desulfurization calcined gypsum processing technology Download PDFInfo
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- CN111807736A CN111807736A CN202010695398.0A CN202010695398A CN111807736A CN 111807736 A CN111807736 A CN 111807736A CN 202010695398 A CN202010695398 A CN 202010695398A CN 111807736 A CN111807736 A CN 111807736A
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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
- C04B11/005—Preparing or treating the raw materials
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/468—Purification of calcium sulfates
-
- 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
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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
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers
-
- 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
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a desulfurization calcined gypsum processing technology, and relates to the technical field of gypsum processing. The processing technology of the desulfurized calcined gypsum comprises the following steps: s1, preparing enough limestone, placing the limestone into crushing equipment for crushing treatment to obtain limestone powder, adding enough clear water into the limestone powder, and stirring uniformly to prepare slurry; s2, pumping the prepared slurry into the reaction tower, introducing sulfur dioxide gas into the absorption tower, and blowing air from the lower part of the reaction tower. According to the invention, in the desulfurization calcined gypsum processing technology, the raw materials are firstly crushed, so that not only is the slurry conveniently prepared, but also the slurry can fully react with sulfur dioxide, and meanwhile, sulfur dioxide is introduced into the absorption tower, so that the existence of other impurities is reduced, the purity of the prepared gypsum is improved, the processing technology of the desulfurization calcined gypsum is reasonably optimized, and the processing efficiency of the desulfurization calcined gypsum is improved.
Description
Technical Field
The invention relates to the technical field of gypsum processing, in particular to a processing technology of desulfurized calcined gypsum.
Background
Gypsum is a monoclinic mineral and is a hydrate whose main chemical component is calcium sulfate (CaSO 4). Gypsum is a widely used industrial and building material. Can be used for cement retarders, gypsum building products, model making, medical food additives, sulfuric acid production, paper fillers, paint fillers and the like.
The gypsum building material is not only good in performance, but also green, the application of the foreign gypsum building material is wide, a modular light building system suitable for less than 8 layers is built in Europe, the building structure is built on a construction site by using a steel frame, the building structure is connected by using rivets, then the boards manufactured in factories are transported to the construction site for assembly, the building is covered by four layers in three days, the inner wall is a heat insulation board with various colors, the outer wall is provided with a rainproof waterproof board, the gypsum building materials are usually made of desulfurized plaster, at present, the use amount of the desulfurized plaster is increasingly large, however, the existing desulfurized plaster is simple in processing technology, the desulfurized plaster is low in purity and doped with more impurities, and more additives still need to be added when the desulfurized plaster is used subsequently, and certain limitation exists.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a desulfurization calcined gypsum processing technology, which solves the defects and shortcomings of the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a desulfurization calcined gypsum processing technology comprises the following steps:
s1, preparing enough limestone, placing the limestone into crushing equipment for crushing treatment to obtain limestone powder, adding enough clear water into the limestone powder, and stirring uniformly to prepare slurry;
s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;
s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector;
s4, adding the additive into the gypsum, stirring and mixing uniformly, and then taking out the gypsum added with the additive for later use;
s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred in the drying process;
s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder, then sending the gypsum powder into a calcining furnace, and calcining the gypsum powder in the calcining furnace to obtain the desulfurized calcined gypsum.
Preferably, the time of the crushing treatment in the step 1 is 10-20min, the crushing speed is 800-.
Preferably, the water content is controlled to be 5% -10% in the step 3.
Preferably, the mass ratio of the gypsum to the additive in the step 4 is 100: 1-2, the stirring time is 8-20min, and the stirring speed is 400-600 r/min.
Preferably, the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2.
Preferably, the water-retaining agent is composed of one or more of hydroxypropyl methylcellulose, methylcellulose and carboxymethyl cellulose.
Preferably, the stirring time in the step 5 is 20-30min, the stirring speed is 100-.
Preferably, the particle size of the gypsum powder obtained in the step 6 is 100-200 meshes, the calcination treatment time is 40-60min, and the calcination treatment temperature is 180-200 ℃.
(III) advantageous effects
The invention provides a processing technology of desulfurized calcined gypsum. The method has the following beneficial effects:
1. according to the invention, in the desulfurization calcined gypsum processing technology, the raw materials are firstly crushed, so that not only is the slurry conveniently prepared, but also the slurry can fully react with sulfur dioxide, and meanwhile, sulfur dioxide is introduced into the absorption tower, so that the existence of other impurities is reduced, the purity of the prepared gypsum is improved, the processing technology of the desulfurization calcined gypsum is reasonably optimized, and the processing efficiency of the desulfurization calcined gypsum is improved.
2. According to the invention, the coagulation regulator, the adhesive, the water reducer and the water-retaining agent are added into the gypsum, so that when the calcined gypsum is used for preparing a product, the setting time can be prolonged or shortened, the viscosity and the water retention of the gypsum can be improved, the water consumption required for mixing can be reduced, the relevant performance of the desulfurized calcined gypsum can be realized without other auxiliary agents when the desulfurized calcined gypsum is used, and the working efficiency of the operation is improved.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a processing technology of desulfurized calcined gypsum, which comprises the following steps:
s1, preparing enough limestone, putting the limestone into crushing equipment for crushing treatment, wherein the crushing treatment time is 10min, and the crushing speed is 1000r/min, so as to obtain limestone powder, the particle size of the limestone powder is 100 meshes, adding enough clear water into the obtained limestone powder, stirring uniformly to prepare slurry, and the stirring time is 5min and the stirring speed is 800 r/min;
s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;
s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector to control the water content to be 5-10%;
s4, adding the additive into the gypsum, stirring and mixing uniformly, wherein the mass ratio of the gypsum to the additive is 100: 1, the stirring time is 8min, the stirring speed is 600r/min, and then taking out the gypsum added with the additive for later use;
the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2; the water-retaining agent is composed of one or more of hydroxypropyl methylcellulose, methylcellulose and carboxymethyl cellulose;
s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred in the drying process, the stirring time is 20min, the stirring speed is 200r/min, the drying temperature of the dryer is 100 ℃, and the drying time is 60 min;
s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder with the particle size of 100 meshes, then sending the gypsum powder into a calcining furnace, calcining the gypsum powder in the calcining furnace for 40min at the calcining temperature of 200 ℃, and obtaining the desulfurized calcined gypsum.
According to the invention, the coagulation regulator, the adhesive, the water reducer and the water-retaining agent are added into the gypsum, so that when the calcined gypsum is used for preparing a product, the setting time can be prolonged or shortened, the viscosity and the water retention of the gypsum can be improved, the water consumption required for mixing can be reduced, the relevant performance of the desulfurized calcined gypsum can be realized without other auxiliary agents when the desulfurized calcined gypsum is used, and the working efficiency of the operation is improved.
Example two:
the embodiment of the invention provides a processing technology of desulfurized calcined gypsum, which comprises the following steps:
s1, preparing enough limestone, putting the limestone into crushing equipment for crushing treatment, wherein the crushing treatment time is 15min, and the crushing speed is 900r/min, so that limestone powder is obtained, the particle size of the limestone powder is 150 meshes, adding enough clear water into the obtained limestone powder, stirring uniformly to prepare slurry, and the stirring time is 10min and the stirring speed is 700 r/min;
s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;
s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector to control the water content to be 5-10%;
s4, adding the additive into the gypsum, stirring and mixing uniformly, wherein the mass ratio of the gypsum to the additive is 100: 1.5, the stirring time is 14min, the stirring speed is 500r/min, and then taking out the gypsum added with the additive for later use;
the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2; the water-retaining agent is composed of one or more of hydroxypropyl methylcellulose, methylcellulose and carboxymethyl cellulose;
s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred in the drying process, the stirring time is 25min, the stirring speed is 150r/min, the drying temperature of the dryer is 110 ℃, and the drying time is 45 min;
s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder with the particle size of 150 meshes, then sending the gypsum powder into a calcining furnace, calcining the gypsum powder in the calcining furnace for 50min at 190 ℃, and obtaining the desulfurized calcined gypsum.
Example three:
the embodiment of the invention provides a processing technology of desulfurized calcined gypsum, which comprises the following steps:
s1, preparing enough limestone, putting the limestone into crushing equipment for crushing treatment, wherein the crushing treatment time is 20min, and the crushing speed is 800r/min, so that limestone powder is obtained, the particle size of the limestone powder is 200 meshes, adding enough clear water into the obtained limestone powder, stirring uniformly to prepare slurry, and the stirring time is 15min and the stirring speed is 600 r/min;
s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;
s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector to control the water content to be 5-10%;
s4, adding the additive into the gypsum, stirring and mixing uniformly, wherein the mass ratio of the gypsum to the additive is 100: 2, the stirring time is 20min, the stirring speed is 400r/min, and then taking out the gypsum added with the additive for later use;
the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2; the water-retaining agent is composed of one or more of hydroxypropyl methylcellulose, methylcellulose and carboxymethyl cellulose;
s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred for 30min in the drying process, the stirring speed is 100r/min, the drying temperature of the dryer is 120 ℃, and the drying time is 30 min;
s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder with the particle size of 200 meshes, then sending the gypsum powder into a calcining furnace, calcining the gypsum powder in the calcining furnace for 60min at the temperature of 180 ℃, and obtaining the desulfurized calcined gypsum.
According to the invention, in the desulfurization calcined gypsum processing technology, the raw materials are firstly crushed, so that not only is the slurry conveniently prepared, but also the slurry can fully react with sulfur dioxide, and meanwhile, sulfur dioxide is introduced into the absorption tower, so that the existence of other impurities is reduced, the purity of the prepared gypsum is improved, the processing technology of the desulfurization calcined gypsum is reasonably optimized, and the processing efficiency of the desulfurization calcined gypsum is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A desulfurization calcined gypsum processing technology is characterized in that: the processing technology comprises the following steps:
s1, preparing enough limestone, placing the limestone into crushing equipment for crushing treatment to obtain limestone powder, adding enough clear water into the limestone powder, and stirring uniformly to prepare slurry;
s2, pumping the prepared slurry into a reaction tower, introducing sulfur dioxide gas into the absorption tower, blowing air from the lower part of the reaction tower, carrying out oxidation reaction on the sulfur dioxide, the slurry and the air to generate calcium sulfate, and continuing to react to form gypsum slurry when the calcium sulfate reaches a certain saturation degree;
s3, discharging the obtained gypsum slurry from the reaction tower, firstly concentrating the gypsum slurry, then dehydrating the concentrated gypsum slurry, and detecting the water content of the dehydrated gypsum by using a water detector;
s4, adding the additive into the gypsum, stirring and mixing uniformly, and then taking out the gypsum added with the additive for later use;
s5, feeding the prepared gypsum through a double-screw feeder, carrying out extrusion dehydration, and then feeding the gypsum into a dryer for drying, wherein the gypsum is required to be stirred in the drying process;
s6, taking out the dried gypsum in the dryer, grinding the dried gypsum to obtain gypsum powder, then sending the gypsum powder into a calcining furnace, and calcining the gypsum powder in the calcining furnace to obtain the desulfurized calcined gypsum.
2. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: the time of the crushing treatment in the step 1 is 10-20min, the crushing speed is 1000r/min, the particle size of the limestone powder is 200 meshes in 100-15 min, and the stirring speed is 800r/min in 600-800 min.
3. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: and in the step 3, the water content is controlled to be 5-10%.
4. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: in the step 4, the mass ratio of the gypsum to the additive is 100: 1-2, the stirring time is 8-20min, and the stirring speed is 400-600 r/min.
5. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: the additive consists of a coagulation regulator, an adhesive, a water reducing agent and a water-retaining agent, and the mass ratio of the coagulation regulator to the adhesive to the water reducing agent is 1: 1.1: 0.8: 1.2.
6. The desulfurization calcined gypsum processing technology of claim 5, which is characterized in that: the water-retaining agent is composed of one or more of hydroxypropyl methyl cellulose, methyl cellulose and carboxymethyl cellulose.
7. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: in the step 5, the stirring treatment time is 20-30min, the stirring speed is 100-.
8. The desulfurization calcined gypsum processing technology of claim 1, which is characterized in that: the particle size of the gypsum powder obtained in the step 6 is 100-200 meshes, the calcining treatment time is 40-60min, and the calcining treatment temperature is 180-200 ℃.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015449A (en) * | 1987-05-22 | 1991-05-14 | Promineral Gesellschaft Zur Verwendung Von Mineralstoffen Mbh | Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization |
| CN1727296A (en) * | 2005-07-26 | 2006-02-01 | 万炳进 | Method and system for desulfurization in wet-process of limestone-gypsum, and resource process of desulfurized gypsum |
| CN105396449A (en) * | 2015-10-30 | 2016-03-16 | 太仓东能环保设备有限公司 | Limestone-gypsum wet-process flue gas desulfurization process |
| CN109985496A (en) * | 2019-03-22 | 2019-07-09 | 昆明理工大学 | A kind of method that ammonium strengthens the flue gas desulfurization of red mud ore pulp |
-
2020
- 2020-07-13 CN CN202010695398.0A patent/CN111807736A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015449A (en) * | 1987-05-22 | 1991-05-14 | Promineral Gesellschaft Zur Verwendung Von Mineralstoffen Mbh | Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization |
| CN1727296A (en) * | 2005-07-26 | 2006-02-01 | 万炳进 | Method and system for desulfurization in wet-process of limestone-gypsum, and resource process of desulfurized gypsum |
| CN105396449A (en) * | 2015-10-30 | 2016-03-16 | 太仓东能环保设备有限公司 | Limestone-gypsum wet-process flue gas desulfurization process |
| CN109985496A (en) * | 2019-03-22 | 2019-07-09 | 昆明理工大学 | A kind of method that ammonium strengthens the flue gas desulfurization of red mud ore pulp |
Non-Patent Citations (1)
| Title |
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| 安艳玲主编: "《磷石膏、脱硫石膏资源化与循环经济》", 31 March 2011, 贵州大学出版社 * |
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Application publication date: 20201023 |