CN114031319A - Method for producing building gypsum powder from phosphogypsum - Google Patents
Method for producing building gypsum powder from phosphogypsum Download PDFInfo
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- CN114031319A CN114031319A CN202111485655.9A CN202111485655A CN114031319A CN 114031319 A CN114031319 A CN 114031319A CN 202111485655 A CN202111485655 A CN 202111485655A CN 114031319 A CN114031319 A CN 114031319A
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 84
- 239000010440 gypsum Substances 0.000 title claims abstract description 84
- 239000000843 powder Substances 0.000 title claims abstract description 71
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000001354 calcination Methods 0.000 claims abstract description 58
- 239000000047 product Substances 0.000 claims abstract description 45
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 238000001035 drying Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 239000012065 filter cake Substances 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 31
- 239000007788 liquid Substances 0.000 claims description 22
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 239000000706 filtrate Substances 0.000 claims description 10
- 239000003245 coal Substances 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003345 natural gas Substances 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000002912 waste gas Substances 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 238000011112 process operation Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 12
- 239000012535 impurity Substances 0.000 description 11
- 239000000428 dust Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 7
- 235000012239 silicon dioxide Nutrition 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 239000002367 phosphate rock Substances 0.000 description 5
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000010453 quartz Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- -1 organic matters Chemical compound 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- C04B11/024—Ingredients added before, or during, the calcining process, e.g. calcination modifiers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a method for producing building gypsum powder by using phosphogypsum, which comprises the following steps: carrying out cyclone separation on the phosphogypsum slurry by using a cyclone to obtain an overflow product and an underflow product; and filtering the overflow product to obtain a filter cake, and drying and calcining the filter cake to obtain the building gypsum powder. By controlling reasonable grain size grading, the building gypsum prepared from the low-quality phosphogypsum also has higher strength, and the recycling rate of the phosphogypsum can be improved. The method has simple process operation and low calcination temperature, and does not generate waste gas and waste water in the production process.
Description
Technical Field
The invention belongs to the technical field of phosphogypsum recycling, and particularly relates to a method for producing building gypsum powder by using phosphogypsum.
Background
In the existing wet-process phosphoric acid production process, 1 ton of P is produced2O5Efficient products, with production of 4-6 tons of phosphogypsum. Most of the phosphogypsum solid waste residues can be discharged only by adopting a stockpiling mode at present, and a large amount of land is occupiedMeanwhile, soluble substances of the phosphogypsum, such as phosphorus, fluorine and the like, permeate into soil and water, and cause great pollution. The phosphorus gypsum solid waste discharged by the phosphorus chemical industry in China is about 7500 million tons/year, and the total utilization rate is less than 40 percent. Annual discharge and annual cumulative stockpiling of phosphogypsum has severely limited the sustainable development of the phosphorus chemical industry. The comprehensive utilization of the phosphogypsum is mainly used for repairing cement, gypsum building materials, roadbeds, industrial filler soil and the like. Because the phosphogypsum contains a large amount of CaSO4·2H2And O, so that the beta-hemihydrate gypsum can be used for producing the beta-hemihydrate gypsum as building gypsum powder, wherein the building gypsum powder is one of three retarding materials in the building industry.
The crystal form, particle size distribution, acid pH value, water content, impurity components and content of the phosphogypsum are different according to the quality of phosphorite, ore dressing process and phosphoric acid production process, so that the quality of the comprehensive utilization product of the phosphogypsum is unstable, and particularly, the content of impurities such as fluorine, phosphorus, organic matters, silicate, quartz and the like contained in the phosphogypsum is slightly high, so that the quality of the comprehensive utilization product is unqualified. Patent CN113511829A provides a method for preparing building gypsum powder by using phosphogypsum. Mixing phosphogypsum and residual hot water, pulping, standing, and removing oil-containing impurities on the surface layer of the pulp; and adding the slurry into a cyclone separator for cyclone separation and washing, and collecting the final bottom slag, drying and calcining to prepare the building gypsum powder. The method aims at phosphogypsum produced by high-quality phosphorite after flotation treatment, and the silicon dioxide impurities are mainly concentrated in finer components, so that bottom slag of cyclone separation can be collected. However, in the actual production, a large amount of phosphogypsum is untreated phosphogypsum generated by lower-quality phosphorite and also contains coarse silica impurities such as quartz and the like, so that the purity of calcium sulfate in the building gypsum powder produced by the method is still not high and the performance is poor.
Disclosure of Invention
Aiming at the problems in the process, the invention aims to provide a method for producing building gypsum powder by aiming at low-quality phosphogypsum.
For phosphogypsum produced by phosphorite with higher quality, silicon dioxide impurities are mainly concentrated on thinner components, and the purity of calcium sulfate can be improved by removing overflow by adopting rotational flow, so that the quality of building gypsum is improved. However, the phosphogypsum produced by untreated lower quality phosphorite contains not only relatively fine silicon dioxide impurities, but also relatively coarse silicon dioxide impurities such as quartz, and the like, so that even if a method of removing overflow by rotational flow is adopted, the purity of calcium sulfate in underflow is not high. Therefore, the inventor changes the idea, does not consider improving the purity of the calcium sulfate, and improves the quality of the building gypsum by controlling reasonable grain size grading.
The technical scheme adopted by the invention is as follows:
a method for producing building gypsum powder by using phosphogypsum comprises the following steps:
carrying out cyclone separation on the phosphogypsum slurry by using a cyclone to obtain an overflow product and an underflow product; and filtering the overflow product to obtain a filter cake, drying the filter cake to obtain primary gypsum powder, and calcining the primary gypsum powder to obtain the building gypsum powder.
And (3) performing cyclone separation to collect overflow products to obtain a fine phosphogypsum component, wherein the strength of the fired building gypsum is still high due to the fine calcium sulfate in the fine calcium sulfate component although the purity of the calcium sulfate in the fine calcium sulfate component is not high.
Further, the phosphogypsum slurry is prepared according to the solid-to-liquid ratio of 10-40%.
Further, the phosphogypsum slurry is prepared by adopting a solution after absorbing tail gas of a calcining furnace.
The collected dust particles in the calcining tail gas are returned to the system, so that the components of all particle sizes in the building gypsum are distributed more uniformly, and the strength of the building gypsum is further improved.
Furthermore, the specification of the cyclone is that the diameter phi 1 is 75-150 mm, the diameter phi 2 of the bottom flow opening is 6-20 mm, and the operating pressure of the cyclone is 0.1-0.5 MPa.
Further, the drying temperature is 40-100 ℃.
Further, the calcination temperature is 120-180 ℃.
Furthermore, the calcination process adopts coal or natural gas combustion hot gas to directly contact with the primary gypsum powder for calcination.
The coal is used as fuel, and the calcined building gypsum strength can be further improved after the fly ash contained in the tail gas collected by direct contact combustion and the primary gypsum are mixed. Therefore, in the present invention, it is preferable to use direct contact calcination with hot gas from coal combustion.
Further, the solution for absorbing the tail gas of the calcining furnace is filtrate obtained by filtering overflow products. And tail gas is collected by filtrate for reuse, so that the generation of waste gas and waste water in the whole process flow can be effectively reduced.
The invention also provides the building gypsum powder prepared by the method.
Compared with the prior art, the invention has the beneficial effects that:
by controlling reasonable grain size grading, the building gypsum prepared from the low-quality phosphogypsum also has higher strength, and the recycling rate of the phosphogypsum is improved. The method has simple process operation and low calcination temperature, and does not generate waste gas and waste water in the production process.
Drawings
FIG. 1 particle size grading Curve in example 1
FIG. 2 particle size grading Curve of example 2
FIG. 3 particle size grading Curve of example 3
FIG. 4 particle size grading Curve of example 4
FIG. 5 particle size grading Curve of example 5
FIG. 6 particle size grading curve for comparative example 1
FIG. 7 particle size grading curve for comparative example 2
FIG. 8 particle size grading curve for comparative example 3
Detailed Description
Example 1
(1) Preparing the phosphogypsum and an absorption liquid into slurry, wherein the required absorption liquid is a solution obtained after absorbing tail gas of a calcining furnace;
(2) after being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the overflow product, and filtering the filtrate to absorb the tail gas dust of the calcining furnace; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calcining furnace at high temperature to obtain building gypsum powder, and directly calcining by contacting coal combustion hot gas with the primary gypsum powder.
Preparing the phosphogypsum slurry according to a solid-to-liquid ratio of 10 percent; the specification of the swirler is that the diameter phi 1 is 150mm, and the diameter phi 2 of the bottom flow port is 20 mm; the operating pressure of the swirler is 0.1 MPa; drying the overflow product at 40 ℃ after filtering; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 5.4MPa and 2.6MPa, the initial setting time is 3.3min, and the final setting time is 12.2 min.
Example 2
(1) Preparing the phosphogypsum and absorption liquid into slurry, wherein the required absorption liquid is solution obtained after absorbing tail gas of a calcining furnace
(2) After being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the overflow product, and filtering the filtrate to absorb the tail gas dust of the calcining furnace; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calcining furnace at high temperature to obtain building gypsum powder, and directly calcining by contacting coal combustion hot gas with the primary gypsum powder.
Preparing the phosphogypsum slurry according to a solid-to-liquid ratio of 10 percent; the specification of the swirler is that the diameter phi 1 is 75mm, and the diameter phi 2 of the bottom flow port is 8 mm; the operating pressure of the swirler is 0.3 MPa; drying the overflow product at 40 ℃ after filtering; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 5.9MPa and 2.9MPa, the initial setting time is 3.9min, and the final setting time is 16.2 min.
Example 3
(1) Preparing the phosphogypsum and absorption liquid into slurry, wherein the required absorption liquid is solution obtained after absorbing tail gas of a calcining furnace
(2) After being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the overflow product, and filtering the filtrate to absorb the tail gas dust of the calcining furnace; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calciner at a high temperature to obtain building gypsum powder, and directly calcining by adopting the contact of natural gas combustion hot gas and the primary gypsum powder.
Preparing phosphogypsum slurry according to a solid-to-liquid ratio of 40%; the specification of the swirler is that the diameter phi 1 is 150mm, and the diameter phi 2 of the bottom flow port is 20 mm; the operating pressure of the swirler is 0.1 MPa; drying the overflow product at 40 ℃ after filtering; the calcination temperature of the primary landplaster is 150 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 5.1MPa and 2.2MPa, the initial setting time is 3.2min, and the final setting time is 11.2 min.
Example 4
(1) Preparing the phosphogypsum and an absorption liquid into slurry, wherein the required absorption liquid is a solution obtained after absorbing tail gas of a calcining furnace;
(2) after being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the overflow product, and filtering the filtrate to absorb the tail gas dust of the calcining furnace; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calcining furnace at high temperature to obtain building gypsum powder, and directly calcining by contacting coal combustion hot gas with the primary gypsum powder.
Preparing phosphogypsum slurry according to a solid-to-liquid ratio of 20 percent; the specification of the swirler is that the diameter phi 1 is 75mm, and the diameter phi 2 of the bottom flow port is 6 mm; the operating pressure of the swirler is 0.5 MPa; drying the overflow product at 100 ℃ after filtering; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength of the calcined building gypsum powder is 6.0MPa, the 2h flexural strength is 3.1MPa, the initial setting time is 4.1min, and the final setting time is 19.2 min.
Example 5
(1) Preparing phosphogypsum and water into slurry;
(2) after being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the overflow product; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calcining furnace at high temperature to obtain building gypsum powder, and directly calcining by contacting coal combustion hot gas with the primary gypsum powder.
Preparing the phosphogypsum slurry according to a solid-to-liquid ratio of 10 percent; the specification of the swirler is that the diameter phi 1 is 150mm, and the diameter phi 2 of the bottom flow port is 20 mm; the operating pressure of the swirler is 0.1 MPa; drying the overflow product at 40 ℃ after filtering; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 4.2MPa and 2.1MPa, the initial setting time is 3.1min, and the final setting time is 10.2 min.
Comparative example 1
Drying the phosphogypsum to obtain primary gypsum powder. And calcining the primary gypsum powder at high temperature to obtain the building gypsum powder. Preparing phosphogypsum slurry according to a solid-to-liquid ratio of 20 percent; the drying temperature is 40 ℃; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 2.3MPa and 1.2MPa, the initial setting time is 2.5min, and the final setting time is 9.2 min.
Comparative example 2
(1) Preparing the phosphogypsum and absorption liquid into slurry, wherein the required absorption liquid is solution obtained after absorbing tail gas of a calcining furnace
(2) After being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the underflow product, and filtering the filtrate to absorb the tail gas dust of the calcining furnace; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calcining furnace at high temperature to obtain building gypsum powder, and directly calcining by contacting coal combustion hot gas with the primary gypsum powder.
Preparing phosphogypsum slurry according to a solid-to-liquid ratio of 20 percent; the specification of the swirler is that the diameter phi 1 is 75mm, and the diameter phi 2 of the bottom flow port is 6 mm; the operating pressure of the swirler is 0.5 MPa; drying the overflow product at 40 ℃ after filtering; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 2.7MPa and 1.8MPa, the initial setting time is 2.3min, and the final setting time is 9.6 min.
Comparative example 3
(1) Preparing the phosphogypsum and absorption liquid into slurry, wherein the required absorption liquid is solution obtained after absorbing tail gas of a calcining furnace
(2) After being uniformly stirred, the mixture is subjected to cyclone separation by a cyclone to obtain an overflow product and an underflow product; filtering the overflow product, and filtering the filtrate to absorb the tail gas dust of the calcining furnace; drying the filter cake to obtain primary gypsum powder;
(3) calcining the primary gypsum powder in a calcining furnace at high temperature to obtain building gypsum powder, and directly calcining by contacting coal combustion hot gas with the primary gypsum powder.
Preparing phosphogypsum slurry according to a solid-to-liquid ratio of 20 percent; the specification of the swirler is that the diameter phi 1 is 250mm, and the diameter phi 2 of the bottom flow port is 22 mm; the operating pressure of the cyclone is 0.09 MPa; drying the overflow product at 40 ℃ after filtering; the calcination temperature of the primary gypsum powder is 180 ℃.
The 2h compressive strength and the 2h flexural strength of the calcined building gypsum powder are respectively 2.9MPa and 1.8MPa, the initial setting time is 3.1min, and the final setting time is 10.1 min.
TABLE 1 Primary Gypsum component from examples and calcined building Gypsum powder Properties
| SiO2 | P2O5 | CaO | SO3 | 2h compressive strength | 2h flexural strength | |
| Example 1 | 41.80％ | 0.67％ | 17.27％ | 25.16％ | 5.2MPa | 2.6MPa |
| Example 2 | 49.21％ | 0.82％ | 15.33％ | 21.47％ | 5.9MPa | 2.9MPa |
| Example 3 | 40.10％ | 0.65％ | 17.07％ | 25.08％ | 5.1MPa | 2.2MPa |
| Example 4 | 41.80％ | 0.67％ | 17.27％ | 25.16％ | 6.0MPa | 3.1MPa |
| Example 5 | 41.60％ | 0.68％ | 17.22％ | 25.13％ | 4.2MPa | 2.1MPa |
| Comparative example 1 | 25.27％ | 0.72％ | 23.96％ | 32.88％ | 2.3MPa | 1.2MPa |
| Comparative example 2 | 18.71％ | 0.66％ | 26.70％ | 39.40％ | 2.7MPa | 1.8MPa |
| Comparative example 3 | 25.39％ | 0.61％ | 27.55％ | 36.33％ | 2.9MPa | 1.8MPa |
As can be seen from Table 1 and FIGS. 1 to 5, although the impurity silicon content in examples 1 to 5 is higher, the invention has the advantages that the particle size is intensively distributed in a smaller range of 2 to 50um and the particle size content is regularly distributed by controlling reasonable particle size gradation, so that the 2h compressive strength and the 2h flexural strength of the calcined architectural gypsum are higher than those of a comparative example. Among them, the particle size distribution diagrams of fig. 1 to 4 are more uniform, which shows that the collocation of each fine fraction is more uniform, the peak of example 5 is more prominent, which shows that the distribution of components of each fine fraction is not uniform, and the intermediate fraction is too much, resulting in lower strength. The reason is that example 5 directly uses water to mix phosphogypsum without adding filtrate absorbing the dust of the tail gas of the calcining furnace, so that fly ash and other calcined dust particles are not contained in the building gypsum powder, and the particle size distribution is not uniform enough.
Comparative example 1 is according to the conventional method to dry phosphogypsum directly and get the primary gesso, then calcine and get the building gesso by the high temperature, comparative example 2 uses the method of the invention, but collect the underflow product of the cyclone separation and filter and dry and get the primary gesso; comparative example 3 the process of the invention was used but with cyclones of different specifications; the silicon impurities in the three are less, but the strength is not as good as that in the examples, as can be seen from fig. 6-8, the reason is that the reasonable particle size distribution is not provided, the particle size distribution is irregular, and the large particle size component is more, so that the product quality is seriously reduced due to the slightly high impurity content.
Claims (10)
1. The method for producing building gypsum powder by using phosphogypsum is characterized by comprising the following steps:
carrying out cyclone separation on the phosphogypsum slurry by using a cyclone to obtain an overflow product and an underflow product; and filtering the overflow product to obtain a filter cake, and drying and calcining the filter cake to obtain the building gypsum powder.
2. The method for producing building gesso according to the phosphogypsum of claim 1, wherein the phosphogypsum slurry is formulated at a solid-to-liquid ratio of 10-40%.
3. The method for producing building gesso from phosphogypsum according to claim 2, characterized in that the phosphogypsum slurry is prepared by using a solution after absorbing the tail gas of the calciner.
4. The method for preparing building gypsum powder from phosphogypsum according to claim 1, wherein the specification of the cyclone is 75-150 mm in diameter phi 1, 6-20 mm in diameter phi 2 of the underflow opening and 0.1-0.5 MPa in operating pressure of the cyclone.
5. The method for preparing building gypsum powder from phosphogypsum according to claim 1, wherein the drying temperature is 40-100 ℃.
6. The method for producing building gypsum powder from phosphogypsum according to claim 1, wherein the calcining temperature is 120-180 ℃.
7. The method for producing building gesso from phosphogypsum according to claim 1, characterized in that the calcination is carried out by direct contact with coal or natural gas combustion hot gas.
8. The method of producing building landplaster from phosphogypsum according to claim 7, characterised in that the calcination is carried out by direct contact with hot gases from coal combustion.
9. The method of producing building landplaster with phosphogypsum according to claim 3, characterised in that the solution that absorbs the calciner tail gas is the filtrate obtained by filtration of the overflow product.
10. A building gypsum powder, characterized in that it is obtained by a process according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117105551A (en) * | 2023-07-17 | 2023-11-24 | 昆明理工大学 | Phosphogypsum modification method based on particle size distribution design |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB858469A (en) * | 1957-11-25 | 1961-01-11 | Allied Chem | Improvements in or relating to the bonding of gypsum to paper and products obtained thereby |
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