CN110697669B - Method for improving wet-process phosphoric acid concentration and co-producing semi-hydrated gypsum - Google Patents
Method for improving wet-process phosphoric acid concentration and co-producing semi-hydrated gypsum Download PDFInfo
- Publication number
- CN110697669B CN110697669B CN201911082321.XA CN201911082321A CN110697669B CN 110697669 B CN110697669 B CN 110697669B CN 201911082321 A CN201911082321 A CN 201911082321A CN 110697669 B CN110697669 B CN 110697669B
- Authority
- CN
- China
- Prior art keywords
- phosphoric acid
- semi
- slurry
- acid
- hydrated gypsum
- 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
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/223—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
- C01B25/226—Hemihydrate process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/18—Stationary reactors having moving elements inside
- B01J19/1862—Stationary reactors having moving elements inside placed in series
-
- 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
Abstract
The invention discloses a method for improving the concentration of phosphoric acid by wet method and combining semi-hydrated gypsum, which comprises the steps of pre-treating the phosphoric acid pulp, mixing the phosphoric acid pulp with phosphoric acid and mixed acid pulp to obtain a pre-treated material, reacting the pre-treated material with concentrated sulfuric acid to obtain mixed acid pulp, curing the mixed acid pulp, filtering and separating to obtain phosphoric acid and semi-hydrated gypsum.
Description
Technical Field
The invention relates to the technical field of phosphoric acid production, in particular to a method for improving the concentration of wet-process phosphoric acid and combining semi-hydrated gypsum.
Background
The semi-water process for producing wet phosphoric acid has the advantages of short production flow, low investment and high concentration of produced phosphoric acid, and the obtained phosphoric acid can be directly used for producing DAP or feed monocalcium phosphate without concentration and is used by a plurality of enterprises. Although the production process for producing wet phosphoric acid by the semi-water method has the advantages, if the water content is not well controlled, the consumption of washing water in the filtering link is increased in the production process, the obtained semi-hydrated gypsum is quickly reacted with water to generate gypsum and dihydrate gypsum, pure semi-hydrated gypsum is difficult to obtain, the subsequent filtering difficulty is high, the pipeline is easy to block, the subsequent process is difficult to clean, for example, the blocked pipeline must be cleaned regularly, and even the concentration of phosphoric acid is reduced.
Disclosure of Invention
In view of this, the present invention provides a method for increasing the concentration of wet phosphoric acid in combination with hemihydrate gypsum.
The technical scheme is as follows: the method for improving the concentration of the wet-process phosphoric acid and combining the wet-process phosphoric acid and the semi-hydrated gypsum is characterized by comprising the following steps of: s1: pre-treating the phosphorus ore pulp;
s2: stirring and reacting the phosphorus ore pulp, the phosphoric acid and the mixed acid slurry returned in the step S3 for not less than 60 minutes to obtain a pretreated material, wherein the mass ratio of the phosphorus ore pulp to the phosphoric acid is 1:2.5-3, and the mass of the mixed acid slurry returned in the step S3 is 9-12% of the mass of the phosphoric acid;
s3: mixing the pretreatment material and concentrated sulfuric acid according to the mass ratio of 2.5-3:1 for reacting for 45-60min to obtain mixed acid slurry, returning part of the mixed acid slurry to the step S2, and entering other mixed acid slurry into the step S4;
s4: curing the mixed acid slurry for 60-90min to obtain a mixture of semi-hydrated gypsum and phosphoric acid;
s5: and filtering and separating the mixture of the semi-hydrated gypsum and the phosphoric acid to obtain a semi-hydrated gypsum and phosphoric acid finished product.
By adopting the technical scheme, the phosphoric acid and the returned mixed acid slurry are utilized to acidify and dissolve the phosphoric acid slurry, the water brought in during the dissolution process is very little, the final obtained phosphoric acid concentration is favorably improved, the generation amount of the later-stage gypsum and the dihydrate gypsum is reduced, and the mixture mainly contains calcium ions, sulfate ions, phosphate ions, hydrogen ions and the like because the sulfuric acid in the returned mixed acid slurry is insufficient and the phosphoric acid is excessive in the stage, so that the preparation is made for obtaining better effect and reaction speed for the next reaction; reacting concentrated sulfuric acid, calcium ions, phosphate ions and a small amount of water in a semi-water reaction tank to generate semi-hydrated gypsum and phosphoric acid; and after entering a curing tank, the partially unreacted substances fully react completely, and the obtained semi-hydrated gypsum and phosphoric acid are separated by filtration to obtain a target product.
As a further preferred option:
and (3) the phosphoric acid in the step (S2) is obtained from the phosphoric acid obtained in the step (S5), and the phosphoric acid pulp, the phosphoric acid and the mixed acid pulp react for 60 minutes at 94-98 ℃ to obtain the pretreatment material. The reaction is optimized at 95 ℃, and in the process, the returned sulfuric acid is insufficient, so that the phosphoric acid is redundant, the phosphorus in the phosphorus ore pulp is ionized, and sufficient preparation is provided for obtaining better effect and reaction speed in the next sulfuric acid extraction reaction.
And (3) reacting the pretreated material and concentrated sulfuric acid in the step (S3) at 88-93 ℃ for 60min to obtain the mixed acid slurry. The reaction is optimally carried out at 90 ℃, and the excessive sulfuric acid in the process is favorable for generating semi-hydrated gypsum, so that the semi-hydrated gypsum is prevented from being converted into gypsum and dihydrate gypsum.
Curing the mixed acid slurry obtained in the step S4 at 88-93 ℃ for 90min, and filtering and separating to obtain semi-hydrated gypsum and phosphoric acid with the concentration not lower than 45%. The process is optimally carried out at 90 ℃, and the curing reaction time in the stage is longer than that in the step S3, so that the materials which are not fully reacted in the step S3 are fully reacted in the stage, thereby improving the yield of phosphoric acid and semi-hydrated gypsum.
P in the phosphorus ore pulp before pretreatment in step S1 2 O 5 The content is 32-36%, the moisture content is below 35%, and the rest is impurities. The selected phosphorite slurry is used as a preparation raw material, which is beneficial to reducing the impurity amount in the later period.
The phosphorite slurry pretreatment in the step S1 is carried out in a phosphorite slurry pretreatment device, the phosphorite slurry pretreatment device comprises a phosphorite slurry storage tank, a phosphorite slurry pump, a first filtering device and a metering belt scale which are sequentially connected along the conveying direction of materials, and the water content of the phosphorite slurry after being filtered and separated by the first filtering device is 8-10%.
Steps S2, S3, S4 and S5 are respectively carried out in a pretreatment tank, a semi-water reaction tank, a curing tank and a second filtering device;
the pretreatment tank, the semi-water reaction tank and the curing tank are respectively wound with a steam heating pipe, wherein a phosphorite slurry adding port, a phosphoric acid adding port, a mixed acid adding port and a pretreatment liquid outlet are arranged on the pretreatment tank, a pretreatment liquid inlet, a concentrated sulfuric acid adding port, a return acid outlet and a reaction material outlet are arranged on the semi-water reaction tank, the discharge end of the metering belt scale is connected with the phosphorite slurry adding port, the pretreatment liquid outlet is connected with the pretreatment liquid inlet, the return acid outlet is connected with the mixed acid adding port, the reaction material outlet is connected with the feed inlet of the curing tank, the discharge port of the curing tank is connected with a second filtering device, the liquid outlet of the second filtering device is connected with a phosphoric acid storage tank, the phosphoric acid storage tank is connected with the phosphoric acid adding port, and the solid outlet of the second filtering device is connected with a semi-water gypsum bin.
The second filtering device is a disc-turning type filter, a washing water inlet of the disc-turning type filter is connected with the same washing water pipe, a washing water flowmeter is arranged on the washing water pipe, the second filtering device is used for filtering and separating phosphoric acid and semi-hydrated gypsum, meanwhile, the washing water is introduced into the washing water pipe for washing, and the mass ratio of the mixture of the semi-hydrated gypsum and the phosphoric acid to the washing water is 1:1. The dosage of the washing water is strictly controlled, which is favorable for improving the concentration of phosphoric acid and preventing the semi-hydrated gypsum from being converted into gypsum and dihydrate gypsum.
The exhaust ports of the semi-water reaction tank and the curing tank are connected with a cooling absorption tower, and the top of the cooling absorption tower is provided with a soft water inlet. By adopting the structure, the hydrogen fluoride and the silicon tetrafluoride which are escaped from the semi-water reaction tank and the curing tank can be absorbed by the cooling absorption tower to obtain fluosilicic acid, so that the waste gas can be discharged up to the standard on one hand, and the obtained fluosilicic acid has certain economic value on the other hand.
The mass of the mixed acid slurry returned in the step S3 is 10% of the mass of phosphoric acid. This ratio is the optimum ratio.
Compared with the prior art, the invention has the beneficial effects that: the system utilizes the mixed acid of phosphoric acid and returned acid to acidify and dissolve the phosphoric acid pulp, the water brought in during the dissolution process is very little, the method is favorable for improving the concentration of finally obtained phosphoric acid, reducing the generation amount of post gypsum and dihydrate gypsum, creating favorable conditions for subsequent filtration, fully reacting phosphoric acid, sulfuric acid and phosphoric acid pulp in a semi-water reaction tank and a curing tank to generate semi-hydrated gypsum and phosphoric acid, and obtaining the phosphoric acid and semi-hydrated gypsum through filtration and separation.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is further described below with reference to examples and figures.
As shown in fig. 1, in example 1, a system for increasing the concentration of phosphoric acid by wet process and combining semi-hydrated gypsum comprises a pretreatment tank 1, a semi-hydrated reaction tank 2, a curing tank 3 and a second filtering device 4;
the pretreatment tank 1 is provided with a phosphorite slurry adding port 6, a phosphoric acid adding port 7, a mixed acid adding port 5 and a pretreatment liquid outlet 9, wherein the phosphorite slurry adding port 6 is connected with a phosphorite slurry pretreatment device, the phosphorite slurry pretreatment device comprises a phosphorite slurry storage tank 13, a phosphorite slurry pump 14, a first filtering device 15 and a metering belt scale 16 which are sequentially connected along the conveying direction of materials, a discharge port of the metering belt scale 16 is connected with the phosphorite slurry adding port 6, the phosphorite slurry pump 14 is connected with a frequency converter, and the first filtering device 15 is a disc filter;
the pretreatment device is characterized in that a pretreatment liquid inlet 10, a concentrated sulfuric acid adding port 22, a return acid outlet 11 and a reaction material outlet 12 are arranged on the semi-water reaction tank 2, the pretreatment liquid outlet 9 is connected with the pretreatment liquid inlet 10, the return acid outlet 11 is connected with the mixed acid adding port 5 through a reverse acid pipeline, a return acid pump, a reverse acid flowmeter and a reverse acid control valve are connected in series on the reverse acid pipeline, the reaction material outlet 12 is connected with a feed inlet of the curing tank 3, a discharge port of the curing tank 3 is connected with a feed inlet of the second filtering device 4 through a discharge pipeline, wherein the discharge pipeline is provided with a discharge control valve and a discharge flowmeter, the second filtering device 4 is a turnover type filter, a washing water inlet of the turnover type filter is connected with a same washing water pipe 23, a washing water flowmeter and a washing water control valve are arranged on the washing water pipe 23, a solid outlet of the turnover type filter is connected with a belt conveyer 19, a discharge end of the belt conveyer 19 is connected with a semi-water gypsum bin 20, a liquid outlet of the second filtering device 4 is connected with a phosphoric acid storage tank 21, and a phosphoric acid pump and a phosphoric acid storage tank 7 are connected with the phosphoric acid pump and the phosphoric acid flowmeter.
The exhaust ports of the semi-water reaction tank 2 and the curing tank 3 are connected with a cooling absorption tower 17, and the top of the cooling absorption tower 17 is provided with a soft water inlet.
The pretreatment tank 1, the semi-water reaction tank 2 and the curing tank 3 are respectively spirally wound with steam heating pipes, the inlets of all the steam heating pipes are respectively connected with a boiler 18 for supplying steam through air supply pipelines, the air supply pipelines are provided with air supply control valves, and the outlets of all the steam heating pipes are connected with a same condensed water collecting tank 19.
Example 2 a method of increasing the concentration of wet phosphoric acid and combining hemihydrate gypsum comprising the steps of:
s1: p is selected for pretreatment of phosphorus ore pulp 2 O 5 The phosphorite slurry with the content of 32-36% and the moisture content of 35% is used as a raw material, the phosphorite slurry pretreatment device in the embodiment 1 is utilized for pretreatment, the phosphorite slurry stored in the phosphorite slurry storage tank 13 is sent into the first filtering device 15 through the phosphorite slurry pump 14, and the moisture content of the phosphorite slurry after filtering is 8-10%;
s2: feeding pretreated phosphate rock slurry into a pretreatment tank 1 through a metering belt scale 16, simultaneously pumping mixed acid slurry in a semi-water reaction tank 2 by an acid return pump to the pretreatment tank 1, pumping phosphoric acid in a phosphoric acid storage tank 21 by a phosphoric acid pump, feeding the phosphoric acid into the pretreatment tank 1, stirring and reacting for 60min at 94 ℃ to obtain pretreated slurry, wherein the mass ratio of the phosphate rock slurry to the phosphoric acid is 1:2.5, and the mass of the mixed acid slurry returned in the step S3 is 9% of the mass of the phosphoric acid;
s3: the pretreated material further enters a semi-water reaction tank 2, concentrated sulfuric acid is added to be mixed and reacted with the pretreated material, the mass ratio of the added concentrated sulfuric acid to the pretreated material is 1:2.5, the mixed and stirred reaction is carried out for 45min at 88 ℃, mixed acid slurry is obtained, part of mixed acid slurry returns to the step S2, and other mixed acid slurry enters the step S4;
s4: further curing the mixed acid slurry in a curing tank 3 at 93 ℃ for 90min to obtain a mixture of semi-hydrated gypsum and phosphoric acid;
s5: sending the mixture of the semi-hydrated gypsum and the phosphoric acid into a turnover filter, introducing washing water for washing, wherein the mass ratio of the mixture of the semi-hydrated gypsum and the phosphoric acid to the washing water is 1:1, and filtering and separating after washing to obtain the semi-hydrated gypsum and the phosphoric acid with the concentration of 45%, wherein the purity of the semi-hydrated gypsum is 80%.
Example 3 a method of increasing the concentration of wet phosphoric acid and combining hemihydrate gypsum comprising the steps of:
s1: p is selected for pretreatment of phosphorus ore pulp 2 O 5 Phosphate rock slurry with the content of 32-36% and the moisture content of less than 35% is used as raw materialThe phosphorite slurry pretreatment device in the embodiment 1 carries out pretreatment, phosphorite slurry stored in the phosphorite slurry storage tank 13 is sent into the first filtering device 15 through the phosphorite slurry pump 14, and the water content of the phosphorite slurry after filtration is 8-10%;
s2: feeding pretreated phosphate rock slurry into a pretreatment tank 1 through a metering belt scale 16, simultaneously pumping mixed acid slurry in a semi-water reaction tank 2 by an acid return pump to the pretreatment tank 1, pumping phosphoric acid in a phosphoric acid storage tank 21 by a phosphoric acid pump, feeding the phosphoric acid into the pretreatment tank 1, stirring and reacting for 70min at 98 ℃ to obtain pretreated slurry, wherein the mass ratio of the phosphate rock slurry to the phosphoric acid is 1:3, and the mass of the mixed acid slurry returned in the step S3 is 12% of the mass of the phosphoric acid;
s3: the pretreated material further enters a semi-water reaction tank 2, concentrated sulfuric acid is added to be mixed and reacted with the pretreated material, the mass ratio of the added concentrated sulfuric acid to the pretreated material is 1:3, the mixed and stirred reaction is carried out for 60min at 93 ℃, mixed acid slurry is obtained, part of the mixed acid slurry returns to the step S2, and other mixed acid slurries enter the step S4;
s4: further curing the mixed acid slurry in a curing tank 3 at 88 ℃ for 60min to obtain a mixture of semi-hydrated gypsum and phosphoric acid;
s5: sending the mixture of the semi-hydrated gypsum and the phosphoric acid into a turnover filter, introducing washing water for washing, wherein the mass ratio of the mixture of the semi-hydrated gypsum and the phosphoric acid to the washing water is 1:1, and filtering and separating after washing to obtain the semi-hydrated gypsum and the phosphoric acid with the concentration of 50%, wherein the purity of the semi-hydrated gypsum is 85%.
Example 4 a method of increasing the concentration of wet phosphoric acid and combining hemihydrate gypsum comprising the steps of:
s1: p is selected for pretreatment of phosphorus ore pulp 2 O 5 The phosphorite slurry with the content of 32-36% and the water content of less than 35% is used as a raw material, the phosphorite slurry pretreatment device in the embodiment 1 is utilized for pretreatment, the phosphorite slurry stored in the phosphorite slurry storage tank 13 is sent into the first filtering device 15 through the phosphorite slurry pump 14, and the water content of the phosphorite slurry after filtration is 8-10%;
s2: feeding pretreated phosphate rock slurry into a pretreatment tank 1 through a metering belt scale 16, simultaneously pumping mixed acid slurry in a semi-water reaction tank 2 by an acid return pump to the pretreatment tank 1, pumping phosphoric acid in a phosphoric acid storage tank 21 by a phosphoric acid pump, feeding the phosphoric acid into the pretreatment tank 1, stirring and reacting for 90min at 95 ℃ to obtain pretreated slurry, wherein the mass ratio of the phosphate rock slurry to the phosphoric acid is 1:2.8, and the mass of the mixed acid slurry returned in the step S3 is 10% of the mass of the phosphoric acid;
s3: the pretreated material further enters a semi-water reaction tank 2, concentrated sulfuric acid is added to be mixed and reacted with the pretreated material, the mass ratio of the added concentrated sulfuric acid to the pretreated material is 1:2.6, the mixed and stirred reaction is carried out for 50min at 90 ℃, mixed acid slurry is obtained, part of mixed acid slurry returns to the step S2, and other mixed acid slurry enters the step S4;
s4: further curing the mixed acid slurry in a curing tank 3 at 90 ℃ for 80min to obtain a mixture of semi-hydrated gypsum and phosphoric acid;
s5: sending the mixture of the semi-hydrated gypsum and the phosphoric acid into a turnover filter, introducing washing water for washing, wherein the mass ratio of the mixture of the semi-hydrated gypsum and the phosphoric acid to the washing water is 1:1, and filtering and separating after washing to obtain the semi-hydrated gypsum and the phosphoric acid with the concentration of 52%, wherein the purity of the semi-hydrated gypsum is 86%.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The method for improving the concentration of the wet-process phosphoric acid and combining the wet-process phosphoric acid and the semi-hydrated gypsum is characterized by comprising the following steps of:
s1: pre-treating the phosphorus ore pulp;
p in pre-pretreated phosphorus ore pulp 2 O 5 The content is 32-36%, the moisture content is below 35%, and the rest is impurities;
the phosphorite slurry pretreatment is carried out in a phosphorite slurry pretreatment device, the phosphorite slurry pretreatment device comprises a phosphorite slurry storage tank (13), a phosphorite slurry pump (14), a first filtering device (15) and a metering belt scale (16) which are sequentially connected along the conveying direction of materials, and the water content of phosphorite slurry is 8-10% after the phosphorite slurry is filtered and separated by the first filtering device (15);
s2: stirring and reacting the phosphorus ore pulp, the phosphoric acid and the mixed acid slurry returned in the step S3 for not less than 60 minutes to obtain a pretreated material, wherein the mass ratio of the phosphorus ore pulp to the phosphoric acid is 1:2.5-3, and the mass of the mixed acid slurry returned in the step S3 is 9-12% of the mass of the phosphoric acid;
s3: mixing the pretreatment material and concentrated sulfuric acid according to the mass ratio of 2.5-3:1 for reacting for 45-60min to obtain mixed acid slurry, returning part of the mixed acid slurry to the step S2, and entering other mixed acid slurry into the step S4;
s4: curing the mixed acid slurry for 60-90min to obtain a mixture of semi-hydrated gypsum and phosphoric acid;
s5: and filtering and separating the mixture of the semi-hydrated gypsum and the phosphoric acid to obtain a semi-hydrated gypsum and phosphoric acid finished product.
2. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 1, wherein: and (3) the phosphoric acid in the step (S2) is obtained from the phosphoric acid obtained in the step (S5), and the phosphoric acid pulp, the phosphoric acid and the mixed acid pulp react for 60 minutes at 94-98 ℃ to obtain the pretreatment material.
3. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 1 or 2, wherein: and (3) reacting the pretreated material and concentrated sulfuric acid in the step (S3) at 88-93 ℃ for 60min to obtain the mixed acid slurry.
4. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 3, wherein: curing the mixed acid slurry obtained in the step S4 at 88-93 ℃ for 90min, and filtering and separating to obtain semi-hydrated gypsum and phosphoric acid with the concentration not lower than 45%.
5. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 1, wherein: steps S2, S3, S4 and S5 are respectively carried out in a pretreatment tank (1), a semi-water reaction tank (2), a curing tank (3) and a second filtering device (4);
the pretreatment tank (1), semi-water reaction tank (2) and curing tank (3) are respectively wound with a steam heating pipe, wherein a phosphorite slurry adding port (6), a phosphoric acid adding port (7), a mixed acid adding port (5) and a pretreatment liquid outlet (9) are arranged on the pretreatment tank (1), a pretreatment liquid inlet (10), a concentrated sulfuric acid adding port (22), a return acid outlet (11) and a reaction material outlet (12) are arranged on the semi-water reaction tank (2), the discharge end of a metering belt scale (16) is connected with the phosphorite slurry adding port (6), the pretreatment liquid outlet (9) is connected with the pretreatment liquid inlet (10), the return acid outlet (11) is connected with the mixed acid adding port (5), the reaction material outlet (12) is connected with a feed inlet of the curing tank (3), a second filter device (4) is connected with a phosphoric acid storage tank (21) through a liquid outlet of the second filter device (4), and the phosphoric acid storage tank (21) is connected with the phosphoric acid inlet (7) through a second filter device (20).
6. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 5, wherein: the second filtering device (4) is a turnover type filter, a washing water inlet of the turnover type filter is connected with the same washing water pipe (23), a washing water flowmeter is arranged on the washing water pipe (23), phosphoric acid and semi-hydrated gypsum are filtered and separated by the second filtering device (4), meanwhile, washing water is introduced through the washing water pipe (23) for washing, and the mass ratio of the mixture of the semi-hydrated gypsum and the phosphoric acid to the washing water is 1:1.
7. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 5, wherein: the exhaust ports of the semi-water reaction tank (2) and the curing tank (3) are connected with a cooling absorption tower (17), and the top of the cooling absorption tower (17) is provided with a soft water inlet.
8. The method for increasing the concentration of phosphoric acid by wet process and co-producing semi-hydrated gypsum according to claim 1, wherein: the mass of the mixed acid slurry returned in the step S3 is 10% of the mass of phosphoric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911082321.XA CN110697669B (en) | 2019-11-07 | 2019-11-07 | Method for improving wet-process phosphoric acid concentration and co-producing semi-hydrated gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911082321.XA CN110697669B (en) | 2019-11-07 | 2019-11-07 | Method for improving wet-process phosphoric acid concentration and co-producing semi-hydrated gypsum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110697669A CN110697669A (en) | 2020-01-17 |
| CN110697669B true CN110697669B (en) | 2023-07-11 |
Family
ID=69204548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911082321.XA Active CN110697669B (en) | 2019-11-07 | 2019-11-07 | Method for improving wet-process phosphoric acid concentration and co-producing semi-hydrated gypsum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110697669B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111451004B (en) * | 2020-04-20 | 2022-03-15 | 武汉工程大学 | Method for producing phosphate concentrate and by-producing alpha-semi-hydrated gypsum and magnesium carbonate from calcium collophanite |
| CN116768171A (en) * | 2023-06-28 | 2023-09-19 | 昆明川金诺化工股份有限公司 | Process for producing high-quality semi-aqueous wet-process phosphoric acid |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200211A (en) * | 1981-06-03 | 1982-12-08 | Nippon Kokan Kk <Nkk> | Washing method of hemihydrate gypsum and equipment therefore in the manufactur of phosphoric acid by the wet process |
| CN87102928A (en) * | 1986-12-08 | 1988-06-22 | 三井东压化学株式会社 | The production method of highly concentrated phosphoric acid |
| CN103332664A (en) * | 2013-06-22 | 2013-10-02 | 瓮福（集团）有限责任公司 | Hemi-hydrate process wet process phosphoric acid production process |
| CN106348266A (en) * | 2016-08-25 | 2017-01-25 | 贵州川恒化工股份有限公司 | Method for preparing phosphoric acid and co-produced gypsum powder by hemihydrate process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8182605B2 (en) * | 2002-12-27 | 2012-05-22 | Ecomeld Corp. | Cementitious veneer and laminate material incorporating reinforcing fibers |
-
2019
- 2019-11-07 CN CN201911082321.XA patent/CN110697669B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200211A (en) * | 1981-06-03 | 1982-12-08 | Nippon Kokan Kk <Nkk> | Washing method of hemihydrate gypsum and equipment therefore in the manufactur of phosphoric acid by the wet process |
| CN87102928A (en) * | 1986-12-08 | 1988-06-22 | 三井东压化学株式会社 | The production method of highly concentrated phosphoric acid |
| CN103332664A (en) * | 2013-06-22 | 2013-10-02 | 瓮福（集团）有限责任公司 | Hemi-hydrate process wet process phosphoric acid production process |
| CN106348266A (en) * | 2016-08-25 | 2017-01-25 | 贵州川恒化工股份有限公司 | Method for preparing phosphoric acid and co-produced gypsum powder by hemihydrate process |
Non-Patent Citations (1)
| Title |
|---|
| 伍洋等.半水法磷酸生产工艺研究.磷肥与复肥.2013,第28卷(第6期),11-13. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110697669A (en) | 2020-01-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110697669B (en) | Method for improving wet-process phosphoric acid concentration and co-producing semi-hydrated gypsum | |
| CN105036101B (en) | Hemi-dihydrate process wet method phosphoric acid manufacture process and its system | |
| CN105000585B (en) | In ardealite and purification process technique | |
| CN103496685A (en) | Method for continuously producing feed-grade dibasic calcium phosphate | |
| CN204779369U (en) | In ardealite and purification treatment system | |
| CN112194109B (en) | Method for producing phosphoric acid and coproducing gypsum by semi-water-dihydrate wet-process phosphoric acid process | |
| CN112299386A (en) | Method for removing sulfate radical in wet-process dilute phosphoric acid by using phosphate slurry | |
| WO2013174063A1 (en) | Method for pre-treating phosphorus rock by titanium dioxide waste acid | |
| CN111392702B (en) | Method for preparing concentrated phosphoric acid and gypsum powder by semi-hydrated dihydrate process | |
| CN101423203B (en) | Water-saving and emission-reducing wet method phosphoric acid manufacture process | |
| CN204873846U (en) | Half water - no. 2 water law phosphoric acid by wet process production system | |
| CN105384157A (en) | Technology for producing phosphoric acid through half-hydrate-dihydrate method | |
| CN1960941B (en) | Method for producing phosphoric acid | |
| CN104140088A (en) | Method for producing fertilizer-level monoammonium phosphate through fertilizer-level calcium hydrophosphate | |
| CN211004578U (en) | System for coproduction hemihydrate gypsum of phosphoric acid production by wet process | |
| CN1043521C (en) | Method and apparatus for tower wet production process of concentrated phosphoric acid | |
| CN102731191B (en) | Neutralization process for ammonia in a mother liquor used for producing nitric acid phosphate fertilizer | |
| CN1176011C (en) | Production process of semiwater-diaquo phosphoric acid | |
| CN103359700A (en) | Method for saving acid and reducing ammonium in ammonium phosphate production | |
| CN105819415A (en) | Phosphorus ore all-resource utilization production method preparing feed calcium hydrophosphate with hydrochloric acid | |
| CN112429709B (en) | Method for graded production of wet-process phosphoric acid | |
| CN108203084A (en) | A kind of method and device that raffinate and slag acid production monoammonium phosphate product are added in phosphoric acid,diluted | |
| CN210419248U (en) | Production device of feed-grade calcium hydrophosphate | |
| CN108455544A (en) | A kind of modified dihydrate wet phosphoric acid production system and phosphoric acid preparation method | |
| CN213924051U (en) | Potassium dihydrogen phosphate production system using wet-process phosphoric acid as raw material |
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 |