CN115321854B - Method for preparing building gypsum by purifying and calcining phosphogypsum - Google Patents
Method for preparing building gypsum by purifying and calcining phosphogypsum Download PDFInfo
- Publication number
- CN115321854B CN115321854B CN202210898622.5A CN202210898622A CN115321854B CN 115321854 B CN115321854 B CN 115321854B CN 202210898622 A CN202210898622 A CN 202210898622A CN 115321854 B CN115321854 B CN 115321854B
- Authority
- CN
- China
- Prior art keywords
- phosphogypsum
- ammonia
- water
- gas
- washing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/266—Chemical gypsum
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Removal Of Specific Substances (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing building gypsum by purifying and calcining phosphogypsum. The ammonia water is adopted to leach the phosphogypsum, so that the acidity of the phosphogypsum is neutralized, aluminum in the phosphogypsum can be dissolved, the content of metal impurities is reduced, the ammonia leaching can also inhibit the dissolution of calcium ions, the loss of main elements in the gypsum is reduced, the generation of calcium phosphate and calcium fluoride is inhibited, and the removal of soluble substances in the phosphogypsum is further increased.
Description
Technical Field
The invention belongs to the technical field of phosphogypsum treatment in phosphorus chemical industry, and particularly relates to a method for preparing building gypsum by purifying and calcining phosphogypsum.
Background
The phosphogypsum is solid waste residue discharged by phosphoric acid production by a wet process in phosphorus chemical enterprises, mainly contains calcium sulfate dihydrate, and also contains undecomposed phosphorite, organic matters, silicon dioxide, fluoride, phosphate radical, sulfuric acid, a small amount of metal (potassium, sodium, iron, aluminum), heavy metal and other impurities. Typically, a wet process to produce 1 ton of phosphoric acid will produce 4.5-5.5 tons of phosphogypsum. At present, the annual emission of the phosphogypsum all over the world reaches more than 2 hundred million tons, but the utilization rate of the phosphogypsum does not exceed 10 percent, and the treatment, disposal and comprehensive utilization of the phosphogypsum become a worldwide problem. So far, most phosphogypsum is disposed in a warehouse building and stockpiling mode, which not only occupies a large amount of land, but also brings serious environmental problems to the surrounding environment due to the leakage and transfer of harmful substances in the phosphogypsum. The phosphogypsum contains abundant calcium and sulfur and is a precious resource, and the modified phosphogypsum can replace increasingly tense natural gypsum resources. Therefore, the treatment and utilization of the phosphogypsum waste residue are urgent from the aspects of environmental protection and resource utilization.
The impurities contained in phosphogypsum are divided into soluble and insoluble, wherein, the soluble P 2 O 5 The phosphogypsum is acidic, and the surface of the dried gypsum is pulverized and frosted; soluble fluorine exists in the forms of fluorine ions and fluosilicate ions and slowly reacts with gypsum to release hydrogen ions; the soluble sodium and potassium ions have the main influence on the gypsum product, namely, the gypsum product is pulverized and frosted. The residual insoluble organic matters can be attached to the surface of the gypsum to delay the gypsum coagulation and influence the color of the product.
At present, the purification and impurity removal modes aiming at the phosphogypsum mainly comprise a water washing method, a neutralization method, a flotation method, an acid leaching method or a combination of the methods.
The water washing method is used for removing water-soluble impurities in the phosphogypsum, such as free sulfuric acid, phosphoric acid, water-soluble sulfate, phosphate, villiaumite and the like. The treatment process is simple, but only can remove soluble impurities, the impurity removal is insufficient, the water consumption is large, and the generated wastewater is easy to cause secondary pollution. Although the neutralization method reduces the acidity of the phosphogypsum, the metallic impurity iron and aluminum in the phosphogypsum still have adverse effects. Flotation can only screen out large particle size silica. The acid leaching method consumes a large amount of acid, further increases the acidity of phosphogypsum, and leads to the dissolution of calcium ions.
Therefore, a method for purifying and comprehensively utilizing phosphogypsum is needed.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides a method for preparing building gypsum by purifying and calcining phosphogypsum, which removes harmful substances in the phosphogypsum and improves the availability of the phosphogypsum by purifying and calcining the gypsum.
According to one aspect of the invention, a method for preparing building gypsum by purifying and calcining phosphogypsum is provided, which comprises the following steps:
s1: placing the phosphogypsum in ammonia water for leaching, and carrying out solid-liquid separation to obtain filtrate and filter residue;
s2: washing the filter residue with water, and evaporating ammonia to dry the obtained washing residue to obtain a dried material;
s3: and calcining the dried material at 450-800 ℃, and then performing phase change dehydration at 150-190 ℃ to obtain the building gypsum.
In some embodiments of the invention, in step S1, the solid-to-liquid ratio of the phosphogypsum to the ammonia water is 30-50g/L, and the concentration of the ammonia water is 8-15mol/L.
In some embodiments of the invention, in step S1, the filtrate is subjected to a deamination treatment. Further, the filtrate is deaminated to a nitrogen content of less than 10mg/L.
In some embodiments of the invention, in step S1, the stirring speed of the leaching process is controlled to be 150-300r/min. Further, the leaching time is 2-4h.
In some embodiments of the present invention, in step S2, the liquid produced after the water washing is recycled as washing water; when the nitrogen content in the washing water is enriched to a certain value, the washing water is subjected to deamination treatment. Further, when the nitrogen content in the washing water is more than or equal to 8g/L, the washing water is subjected to deamination treatment.
In some embodiments of the present invention, in step S2, during the water washing, the mass ratio of the filter residue to the water is 1: (1-2).
In some embodiments of the present invention, in step S2, the ammonia evaporation drying is performed by a gas flow drying method, wherein the inlet gas temperature is controlled to be 400-450 ℃, the outlet gas temperature is controlled to be 150-180 ℃, the inlet gas speed is 15-20m/S, and the retention time is 5-10S.
In some embodiments of the present invention, in step S3, the calcination process is: blowing hot air, controlling the air inlet temperature to be 450-800 ℃, the air outlet temperature to be 400-650 ℃, the air inlet speed to be 15-20m/s and the retention time to be 2-5s.
In some embodiments of the present invention, in step S3, the phase-change dehydration process is: blowing hot air, controlling the air inlet temperature at 150-190 deg.C, the air outlet temperature at 150-180 deg.C, the air inlet speed at 15-20m/s, and the retention time at 10-20min.
In some embodiments of the present invention, in step S3, the gas dehydrated by the phase change is mixed with the calcined gas to be used as a heat source for the ammonia evaporation drying in step S2.
In some embodiments of the present invention, the deamination is performed by using a deamination tower, and the gas dehydrated by the phase change in step S3 and/or the ammonia-containing gas dried by ammonia distillation in step S2 is fed into the deamination tower for deamination.
In some embodiments of the invention, the gas generated by the deamination tower is condensed to prepare new ammonia water, the uncondensed non-condensable gas is directly discharged, and when the nitrogen content of the solution in the deamination tower is lower than 10mg/L, the solution is sent to a wastewater treatment system.
According to a preferred embodiment of the present invention, at least the following advantages are provided:
1. according to the invention, the phosphogypsum is leached by ammonia water, so that on one hand, the acidity of the phosphogypsum is neutralized, on the other hand, the stronger ammonia water can dissolve aluminum in the phosphogypsum, and the content of metal impurities in the phosphogypsum is reduced; the phosphogypsum after ammonia leaching is further washed to take away most of residual ammonia water and other soluble salts, so that the primary purification of the phosphogypsum is realized; then ammonia evaporation, calcination and phase change are sequentially carried out to prepare the semi-hydrated gypsum. Preferably, the process can fully utilize the waste heat generated in each process, the waste heat in the calcining and phase-change processes is introduced into the ammonia distilling system and the ammonia removing system, the heat consumption is reduced, the waste heat can be recycled to prepare a new ammonia water solution, and the resource utilization is realized.
2. Carrying out ammonia leaching on phosphogypsum by adopting concentrated ammonia water, wherein part of reactions are as follows:
6NH 3 ·H 2 O+P 2 O 5 →2(NH 4 ) 3 PO 4 +3H 2 O；
3NH 3 ·H 2 O+H 3 PO 4 →(NH 4 ) 3 PO 4 +3H 2 O；
NH 3 ·H 2 O+HF→NH 4 F+H 2 O；
SiF 6 2- +4NH 3 ·H 2 O→6F - +4NH 4 + +SiO 2 +H 2 O；
4NH 3 ·H 2 O+Al 3+ →4NH 4 + +[Al(OH) 4 ] - 。
the strong ammonia water can neutralize the acidity of the phosphogypsum and dissolve aluminum metal impurities in the phosphogypsum, and 99 percent of ammonia in an ammonia water system is NH 3 In the form of (A), NH 3 The polarity of N is so strong that H exists almost in the proton state, providing multiple sites for hydrogen bonding. In CaSO 4 ·2H 2 The O surface and O atoms in the adjacent Ca-O double layers form N-H.O hydrogen bonds, the stability between the adjacent Ca-O double layers is increased, and simultaneously, the new hydrogen bonds enable NH 3 Attached to CaSO 4 ·2H 2 The surface of the O crystal increases the potential barrier during interlayer dissolution and inhibits the dissolution of calcium ions. Therefore, the ammonia leaching can reduce the loss of main elements in the gypsum, inhibit the generation of calcium phosphate and calcium fluoride, and further increase the removal of soluble substances in the phosphogypsum.
Drawings
The invention is further described with reference to the following figures and examples, in which:
FIG. 1 is a process flow diagram of example 1 of the present invention.
Detailed Description
The idea of the invention and the resulting technical effects will be clearly and completely described below in connection with the embodiments, so that the objects, features and effects of the invention can be fully understood. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Example 1
A method for preparing building gypsum by purifying and calcining phosphogypsum, which refers to fig. 1, and comprises the following specific processes:
step 1, placing phosphogypsum into ammonia water with the concentration of 15mol/L according to the solid-to-liquid ratio of 50g/L, stirring at the rotating speed of 300r/min, and leaching for 2h;
step 2, carrying out solid-liquid separation to obtain filtrate and filter cake, feeding the filtrate into a deamination tower for deamination treatment, and feeding the filter cake into a water washing process;
step 3, phosphogypsum is prepared from the following components in percentage by mass: water =1, washing the filter cake with primary water;
step 4, performing solid-liquid separation, enabling the obtained washing slag to enter an ammonia distillation system, enabling the generated liquid to be recycled as washing water, and when the nitrogen content in the washing water reaches 8g/L, sending the washing water and filtrate to a deamination tower for treatment;
step 5, placing the water washing slag obtained in the step 4 in a pulse airflow type dryer for ammonia evaporation and drying, controlling the air inlet temperature to be 450 ℃, the air outlet temperature to be 180 ℃, the air inlet speed to be 20m/s and the retention time to be 5s;
step 6, placing the material subjected to ammonia evaporation and drying in a calcining furnace for calcining, blowing high-temperature hot air, controlling the air inlet temperature to be 800 ℃, the air outlet temperature to be 600 ℃, the air inlet speed to be 15m/s and the retention time to be 2s;
step 7, placing the calcined material in a fluidized bed for phase change dehydration, blowing medium-temperature hot air, controlling the air inlet temperature to be 190 ℃, the air outlet temperature to be 180 ℃, the air inlet speed to be 15m/s and the retention time to be 10s;
step 8, after the phase change reaction is finished, cooling to room temperature to obtain semi-hydrated gypsum;
step 9, mixing one part of gas from the phase change system with gas from the calcining system, then entering an ammonia distillation system in the step 5 to serve as a heat source of the ammonia distillation system, mixing the other part of gas with ammonia-containing gas from the ammonia distillation system, then entering a deamination tower, and carrying out deamination treatment on the filtrate;
and step 10, continuously evaporating ammonia gas and water in the filtrate along with the heat exchange reaction in the deamination tower, sending the generated solid waste residues to a solid waste treatment plant, condensing the generated gas by a condenser to prepare new ammonia water, directly discharging uncondensed non-condensable gas, and sending the filtrate to a wastewater treatment system when the content of filtered liquid nitrogen in the tower is lower than 10mg/L.
Example 2
A method for preparing building gypsum by purifying and calcining phosphogypsum comprises the following specific processes:
step 1, placing phosphogypsum into ammonia water with the concentration of 12mol/L according to the solid-to-liquid ratio of 40g/L, stirring at the rotating speed of 200r/min, and leaching for 3h;
step 2, carrying out solid-liquid separation to obtain filtrate and filter cake, feeding the filtrate into a deamination tower for deamination treatment, and feeding the filter cake into a water washing process;
step 3, according to the mass ratio of the phosphogypsum: water = 1.5, washing the filter cake with primary water;
step 4, performing solid-liquid separation, enabling the obtained washing slag to enter an ammonia distillation system, enabling the generated liquid to be recycled as washing water, and when the nitrogen content in the washing water reaches 8g/L, sending the washing water and filtrate to a deamination tower for treatment;
step 5, placing the water washing slag obtained in the step 4 in a pulse airflow type dryer for ammonia distillation and drying, controlling the air inlet temperature to be 430 ℃, the air outlet temperature to be 165 ℃, the air inlet speed to be 17m/s, and the retention time to be 7s;
step 6, placing the material subjected to ammonia distillation and drying in a calcining furnace for calcining, blowing high-temperature hot air, controlling the air inlet temperature to be 600 ℃, the air outlet temperature to be 500 ℃, the air inlet speed to be 16m/s and the retention time to be 3s;
step 7, placing the calcined material in a fluidized bed for phase change dehydration, blowing medium-temperature hot air, controlling the air inlet temperature to be 170 ℃, the air outlet temperature to be 160 ℃, the air inlet speed to be 18m/s and the retention time to be 15s;
step 8, after the phase change reaction is finished, cooling to room temperature to obtain semi-hydrated gypsum;
step 9, mixing one part of gas from the phase change system with gas from the calcining system, then entering an ammonia distillation system in the step 5 to serve as a heat source of the ammonia distillation system, mixing the other part of gas with ammonia-containing gas from the ammonia distillation system, then entering a deamination tower, and carrying out deamination treatment on the filtrate;
and step 10, continuously evaporating ammonia gas and water in the filtrate with the progress of heat exchange reaction in the deamination tower, sending the generated solid waste residues to a solid waste treatment plant, condensing the generated gas by a condenser to prepare new ammonia water, directly discharging uncondensed non-condensable gas, and sending the filtrate to a wastewater treatment system when the content of filtered liquid nitrogen in the tower is lower than 10mg/L.
Example 3
A method for preparing building gypsum by purifying and calcining phosphogypsum comprises the following specific processes:
step 1, placing phosphogypsum into ammonia water with the concentration of 8mol/L according to the solid-to-liquid ratio of 30g/L, stirring at the rotating speed of 150r/min, and leaching for 4h;
step 2, carrying out solid-liquid separation to obtain filtrate and filter cake, enabling the filtrate to enter a deamination tower for deamination treatment, and enabling the filter cake to enter a water washing procedure;
step 3, phosphogypsum is prepared from the following components in percentage by mass: water =1, and primary water is adopted to clean the filter cake;
step 4, performing solid-liquid separation, enabling the obtained washing slag to enter an ammonia distillation system, enabling the generated liquid to be recycled as washing water, and when the nitrogen content in the washing water reaches 8g/L, sending the washing water and filtrate to a deamination tower for treatment;
step 5, placing the water washing slag obtained in the step 4 in a pulse airflow type dryer for ammonia distillation and drying, controlling the air inlet temperature to be 400 ℃, the air outlet temperature to be 150 ℃, the air inlet speed to be 15m/s and the retention time to be 10s;
step 6, placing the material subjected to ammonia evaporation and drying in a calcining furnace for calcining, blowing high-temperature hot air, controlling the air inlet temperature to be 450 ℃, the air outlet temperature to be 400 ℃, the air inlet speed to be 15m/s and the retention time to be 5s;
step 7, placing the calcined material in a fluidized bed for phase change dehydration, blowing medium-temperature hot air, controlling the air inlet temperature to be 155 ℃, the air outlet temperature to be 150 ℃, the air inlet speed to be 15m/s and the retention time to be 20s;
step 8, after the phase change reaction is finished, cooling to room temperature to obtain semi-hydrated gypsum;
step 9, mixing one part of gas from the phase change system with gas from the calcining system, then entering an ammonia distillation system in the step 5 to serve as a heat source of the ammonia distillation system, mixing the other part of gas with ammonia-containing gas from the ammonia distillation system, then entering a deamination tower, and carrying out deamination treatment on the filtrate;
and step 10, continuously evaporating ammonia gas and water in the filtrate with the progress of heat exchange reaction in the deamination tower, sending the generated solid waste residues to a solid waste treatment plant, condensing the generated gas by a condenser to prepare new ammonia water, directly discharging uncondensed non-condensable gas, and sending the filtrate to a wastewater treatment system when the content of filtered liquid nitrogen in the tower is lower than 10mg/L.
Comparative example
A method for preparing building gypsum by purifying and calcining phosphogypsum does not carry out ammonia leaching, and comprises the following specific processes:
step 1, placing phosphogypsum into primary water according to a solid-to-liquid ratio of 30g/L, and stirring at a rotating speed of 300r/min for leaching for 4 hours;
step 2, carrying out solid-liquid separation to obtain filtrate and filter cake;
step 3, phosphogypsum is prepared from the following components in percentage by mass: the proportion of water = 1;
step 4, performing solid-liquid separation, and drying the obtained washing slag in a pulse airflow type dryer, wherein the air inlet temperature is controlled to be 450 ℃, the air outlet temperature is controlled to be 180 ℃, the air inlet speed is 20m/s, and the retention time is 10s;
step 6, placing the dried material in a calcining furnace for calcining, blowing high-temperature hot air, controlling the air inlet temperature to be 800 ℃, the air outlet temperature to be 650 ℃, the air inlet speed to be 20m/s and the retention time to be 5s;
step 7, placing the calcined material in a fluidized bed for phase change dehydration, blowing medium-temperature hot air, controlling the air inlet temperature to be 190 ℃, the air outlet temperature to be 180 ℃, the air inlet speed to be 20m/s and the retention time to be 20s;
and 8, cooling to room temperature after the phase change reaction is finished to obtain the semi-hydrated gypsum.
The phosphogypsum raw materials, the semi-hydrated gypsum obtained in the examples and the comparative examples are detected according to GB/T5484-2012 gypsum chemical analysis method and JC/T2073 phosphogypsum phosphorus and fluorine determination method GB/T36141 building gypsum phase composition analysis method, and the results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the examples have low impurity content and high yield, the comparative example has no ammonia leaching treatment, the yield is low, the impurity content is higher than that of the examples, because the comparative example only adopts water washing, the impurity removal is insufficient, and the water washing process can cause the dissolution of a small amount of calcium, so that the yield is reduced, while the ammonia leaching process of the examples not only facilitates the leaching of impurities, but also can inhibit CaSO 4 ·2H 2 And (4) dissolving O.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The method for preparing the building gypsum by purifying and calcining the phosphogypsum is characterized by comprising the following steps of:
s1: placing the phosphogypsum in ammonia water for leaching, and carrying out solid-liquid separation to obtain filtrate and filter residue;
s2: washing the filter residue with water, and performing ammonia evaporation drying on the obtained washing residue to obtain a dried material;
s3: and calcining the dried material at 450-800 ℃, and then performing phase change dehydration at 150-190 ℃ to obtain the building gypsum.
2. The method according to claim 1, wherein in step S1, the solid-to-liquid ratio of the phosphogypsum to the ammonia water is 30-50g/L, and the concentration of the ammonia water is 8-15mol/L.
3. The method of claim 1, wherein in step S1, the filtrate is deaminated.
4. The method according to claim 1, wherein in step S2, the liquid produced after the water washing is recycled as washing water; when the nitrogen content in the washing water is more than or equal to 8g/L, the washing water is subjected to deamination treatment.
5. The method as claimed in claim 1, wherein in step S2, the ammonia evaporation drying is performed by a gas flow drying method, wherein the inlet gas temperature is controlled to be 400-450 ℃, the outlet gas temperature is controlled to be 150-180 ℃, the inlet gas velocity is 15-20m/S, and the retention time is 5-10S.
6. The method of claim 1, wherein in step S3, the calcining process comprises: blowing hot air, controlling the air inlet temperature to be 450-800 ℃, the air outlet temperature to be 400-650 ℃, the air inlet speed to be 15-20m/s and the retention time to be 2-5s.
7. The method according to claim 1, wherein in step S3, the phase-change dehydration process is: blowing hot air, controlling the air inlet temperature at 150-190 deg.C, the air outlet temperature at 150-180 deg.C, the air inlet speed at 15-20m/s, and the retention time at 10-20min.
8. The method of claim 1, wherein in step S3, the gas dehydrated by phase transition and the gas calcined are mixed to be used as a heat source for the ammonia evaporation drying in step S2.
9. The method of claim 3 or 4, wherein the deamination treatment is performed by using a deamination tower, and the gas dehydrated through the phase change in the step S3 and/or the ammonia-containing gas dried by ammonia distillation in the step S2 enter the deamination tower for deamination treatment.
10. The method of claim 9, wherein the gas generated by the deamination tower is condensed to prepare new ammonia water, uncondensed non-condensable gas is directly discharged, and when the nitrogen content of the solution in the deamination tower is lower than 10mg/L, the solution is sent to a wastewater treatment system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210898622.5A CN115321854B (en) | 2022-07-28 | 2022-07-28 | Method for preparing building gypsum by purifying and calcining phosphogypsum |
| PCT/CN2022/117485 WO2024021235A1 (en) | 2022-07-28 | 2022-09-07 | Method for preparing building gypsum by purifying and calcining phosphogypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210898622.5A CN115321854B (en) | 2022-07-28 | 2022-07-28 | Method for preparing building gypsum by purifying and calcining phosphogypsum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115321854A CN115321854A (en) | 2022-11-11 |
| CN115321854B true CN115321854B (en) | 2023-04-11 |
Family
ID=83919610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210898622.5A Active CN115321854B (en) | 2022-07-28 | 2022-07-28 | Method for preparing building gypsum by purifying and calcining phosphogypsum |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115321854B (en) |
| WO (1) | WO2024021235A1 (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3780359B2 (en) * | 2000-11-30 | 2006-05-31 | 太平洋セメント株式会社 | Treatment method for petroleum combustion ash |
| CN102390942A (en) * | 2011-08-16 | 2012-03-28 | 重庆金仓龙新型建材有限公司 | Method for producing building powdered gypsum by using phosphogypsum |
| CN105217590B (en) * | 2015-09-18 | 2017-05-10 | 金正大诺泰尔化学有限公司 | Method for production of wet process phosphoric acid and byproducts alpha-hemihydrated gypsum and high purity and high whiteness alpha-hemihydrated gypsum |
| CN107512857B (en) * | 2017-09-01 | 2023-08-11 | 湖北三峡职业技术学院 | Method and device for preparing building gypsum by phosphogypsum |
| CN110194605B (en) * | 2019-06-28 | 2020-03-24 | 山东高速齐鲁建设集团有限公司 | Method for preparing building gypsum by using phosphogypsum |
| CN112279539B (en) * | 2020-09-15 | 2022-06-14 | 昆明理工大学 | Method for preparing phosphorus building gypsum through screening and calcining |
| CN112978781A (en) * | 2021-04-13 | 2021-06-18 | 中国五环工程有限公司 | Phosphogypsum harmless treatment method |
| CN113511829B (en) * | 2021-04-23 | 2022-11-15 | 四川省生态环境科学研究院 | Method for preparing building gypsum powder from phosphogypsum |
-
2022
- 2022-07-28 CN CN202210898622.5A patent/CN115321854B/en active Active
- 2022-09-07 WO PCT/CN2022/117485 patent/WO2024021235A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024021235A1 (en) | 2024-02-01 |
| CN115321854A (en) | 2022-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104495899B (en) | A kind of carbide slag and flyash work in coordination with the method for recycling | |
| CN100404423C (en) | Method for preparing alumina from fly ash | |
| CN102815681B (en) | Method for producing feed-grade calcium dihydrogen phosphate from wet-process phosphoric acid | |
| CN110550644B (en) | Method for separating and extracting battery-grade lithium carbonate, rubidium and cesium salts from lepidolite | |
| CN109336140B (en) | Process for extracting lithium by adding lithium iron phosphate into lepidolite | |
| CN110217810B (en) | Method for efficiently recovering valuable elements in aluminum ash | |
| CN102864318B (en) | Method for recycling vanadium from acid vanadium-containing solution containing silicon and phosphorus | |
| WO2013040862A1 (en) | Method for producing aluminium oxide by processing fly ash with ammonia process | |
| CN102897810B (en) | Method for producing aluminum oxide by using fly ash | |
| CN103224221B (en) | A kind of method utilizing ferrous sulfate monohydrate slag separation sulfuric acid and ferrous sulfate | |
| CN103553138A (en) | Comprehensive utilization method for separating, concentrating and purifying manganese sulfate, magnesium sulfate and calcium sulfate in high-salt waste water | |
| CN102502735B (en) | Method for producing alumina by using pulverized fuel ash | |
| CN102502736A (en) | Method for producing alumina by using pulverized fuel ash | |
| CN105110352B (en) | A kind of be raw material production potassium sulfate with the solid waste containing potassium, chloride ion method | |
| CN108396158A (en) | A kind of processing method of the complex salt crystal object of electrolytic manganese process | |
| WO2017173716A1 (en) | Method for joint production of phosphogypsum decomposition gas and wet-process phosphoric acid | |
| CN102328947B (en) | Method for recovering strontium slag | |
| CN107285349A (en) | A kind of method that aluminum oxide is extracted by raw material of aluminous fly-ash | |
| CN102531055A (en) | Method for preparing sodium metavanadate/potassium metavanadate | |
| CN104016357B (en) | A kind of manganese slag for comprehensive utilizes the method for producing industrial chemicals | |
| CN206843088U (en) | Magnesium desulfurization byproduct refines the processing system of epsom salt technique | |
| CN115321854B (en) | Method for preparing building gypsum by purifying and calcining phosphogypsum | |
| CN103086411A (en) | Method for producing metallurgical grade sandy alumina by mixing and roasting flyash and ammonium sulfate | |
| CN104909396B (en) | A kind of method of alum deep decomposition | |
| CN103664242B (en) | Caustic sludge treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |