CN110548317A - Flocculating agent and impurity sedimentation system suitable for wet-process phosphoric acid production - Google Patents
Flocculating agent and impurity sedimentation system suitable for wet-process phosphoric acid production Download PDFInfo
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- CN110548317A CN110548317A CN201910893096.1A CN201910893096A CN110548317A CN 110548317 A CN110548317 A CN 110548317A CN 201910893096 A CN201910893096 A CN 201910893096A CN 110548317 A CN110548317 A CN 110548317A
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- flocculant
- flocculating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
-
- 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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a flocculant suitable for wet-process phosphoric acid production, which comprises a solution formed by mixing process water and backflow water, wherein the phosphorus content in the solution is 3000-4500mg/L, and the pH value of the solution is 2-7; the solution contains polyacrylamide with the mass concentration of 1.5-3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand. By changing the solvent for dissolving polyacrylamide from pure industrial water into industrial water and reflux water with a certain proportion, the using amount of the industrial water is reduced and the cost of impurity precipitation treatment is reduced under the condition of not influencing the impurity flocculation precipitation. The invention also discloses an impurity settling system adopting the flocculant.
Description
Technical Field
The invention relates to the field of phosphoric acid production, in particular to a flocculating agent and an impurity settling system suitable for wet-process phosphoric acid production.
Background
Phosphogypsum is industrial waste residue generated when phosphoric ore is extracted by sulfuric acid in wet-process phosphoric acid production, and about 5 tons of phosphogypsum are discharged per 1 ton of phosphoric acid produced. Because the phosphogypsum filtered by the phosphoric acid contains phosphorus pentoxide, during the conversion reaction with ammonium carbonate, colloid is easily generated due to the existence of the phosphorus pentoxide when the phosphogypsum is recycled, and the colloid prevents the growth of crystal particles of the calcium carbonate product, blocks filter cloth in the solid-liquid separation process and influences the normal production of the device. Therefore, before being used, the phosphogypsum is washed and filtered once to reduce the content of phosphorus pentoxide.
The phosphorite reacts with sulfuric acid to form gypsum slurry, and the slurry enters a filter to be filtered so as to separate phosphoric acid from phosphogypsum. In order to avoid the blocking of the filter cloth of the filter by the impurity particle phosphogypsum in the slurry in the filtering process, a flocculating agent is usually added into the slurry before the filtering process, and the impurity particle phosphogypsum in the slurry is flocculated into clusters by utilizing the flocculation action.
The method has the problems that in order to adjust and control the concentration of the flocculating agent so that the flocculating agent can be fully mixed with impurity particles for sedimentation, a large amount of industrial water is consumed for diluting the flocculating agent, and then the diluted flocculating agent is proportionally added into the slurry with sedimentation purification. The industrial water is water without impurities, the acquisition cost is higher than that of a common water source, the industrial water is used in a large amount, and the treatment cost of impurity flocculation and sedimentation is increased.
Disclosure of Invention
In view of the above, the present application provides a flocculant suitable for wet-process phosphoric acid production, in which a solvent for dissolving polyacrylamide is changed from pure industrial water to a certain ratio of industrial water and return water, so that the amount of industrial water is reduced and the cost of impurity precipitation treatment is reduced without affecting the flocculation and precipitation of impurities.
In order to solve the technical problems, the technical scheme provided by the invention is that the flocculant suitable for wet-process phosphoric acid production comprises a solution formed by mixing process water and reflux water, wherein the phosphorus content in the solution is 3000-4500mg/L, and the pH value of the solution is 2-7; the solution contains polyacrylamide with the mass concentration of 1.5-3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
Preferably, the solution is formed by mixing 55-65% of reflux water and 35-45% of process water, and the phosphorus content in the reflux water is 6100-8100 mg/L.
Preferably, the fluorine content in the reflux water is 6000-8000 mg/L.
The application also provides an impurity settling system, wherein a dissolving tank, a pressure pump and a filter are sequentially arranged on a slurry conveying pipeline for injecting slurry, and a flocculating agent adding tank is arranged between the dissolving tank and the pressure pump; the flocculating agent adding tank is internally provided with a flocculating agent, the flocculating agent contains polyacrylamide with the mass concentration of 1.5-3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
Preferably, the phosphorus content in the flocculant is 3000-4500mg/L, and the pH value of the flocculant is 2-7.
Preferably, the mixing ratio of the flocculating agent to the slurry is 1: 400-600.
Preferably, the flocculating agent adds the groove and is connected with flocculating agent preparation groove, flocculating agent preparation groove through the pipeline of taking the valve with flocculating agent adds the groove intercommunication, be equipped with agitating unit in the flocculating agent preparation groove.
Preferably, the number of the dissolving tanks is not less than two, and the dissolving tanks are sequentially connected in series on the slurry conveying pipeline.
Compared with the prior art, the application has the beneficial effects that:
The industrial water and the return water are mixed to prepare a solvent of the flocculating agent, so that the consumption of the industrial water is reduced, and the cost of impurity precipitation treatment is reduced. Macromolecular polyacrylamide is used as a flocculating agent for precipitation, so that impurities can be more fully precipitated, and the filter cloth meshes can not be blocked when slurry enters a subsequent filtering process.
The reflux water content in the solvent is over half, and the use amount of industrial water in the flocculation precipitation is further reduced.
The slurry is fully dissolved in the dissolving tank and then enters a flocculating agent adding tank, after the impurities are flocculated and precipitated, the slurry continuously flows along a slurry conveying pipeline and enters a filter under the pumping action of a pressure pump.
After the flocculating agent is configured to the proper concentration in the flocculating agent preparation tank, the stirring is continuously kept, and the stable suspension of the flocculating agent is ensured. A valve is arranged between the flocculating agent preparation tank and the flocculating agent adding tank, and the adding speed of the flocculating agent can be adjusted in time according to the flow of the slurry, so that the concentration ratio of the flocculating agent to the slurry is maintained.
A plurality of dissolving tanks set gradually, make the thick liquids fully dissolve, make the suspension of foreign particles disperse in the thick liquids simultaneously, be convenient for more combine the back with the flocculating agent and deposit.
Drawings
Fig. 1 is a schematic structural view of an impurity settling system of the present invention.
Reference numerals: a slurry conveying pipeline 1, a dissolving tank 2, a pressure pump 3, a filter 4, a flocculating agent adding tank 51, a flocculating agent preparing tank 52 and a valve 53.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The term "reflux water" as used herein refers to water produced in the wet-process phosphoric acid production process or discharged after use, such as condensed water, filtered water, and rinse water.
Example one
The embodiment provides a flocculant suitable for wet-process phosphoric acid production, which comprises a solution formed by mixing 55% of reflux water and 45% of process water, wherein the phosphorus content in the reflux water is 6100mg/L, and the fluorine content in the reflux water is 6000 mg/L; the phosphorus content in the solution is 3000mg/L, and the pH value of the solution is 7; the solution contains 1.5 per thousand mass concentration of polyacrylamide, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
Referring to the attached drawings, the embodiment also provides an impurity settling system adopting the flocculant, wherein a dissolving tank 2, a pressure pump 3 and a filter 4 are sequentially arranged on a slurry conveying pipeline 1 for injecting slurry, the number of the dissolving tanks 2 is not less than two, the dissolving tanks are sequentially connected in series on the slurry conveying pipeline 1, and a flocculant adding tank 51 is arranged between the dissolving tank 2 and the pressure pump 3; the flocculant adding tank 51 is connected with a flocculant preparing tank 52, the flocculant preparing tank 52 is communicated with the flocculant adding tank 51 through a pipeline with a valve 53, and a stirring device is arranged in the flocculant preparing tank 52.
The flocculating agent adding tank 51 is internally provided with a flocculating agent, the flocculating agent contains polyacrylamide with the mass concentration of 1.5 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand. The phosphorus content in the flocculant is 3000mg/L, and the pH value of the flocculant is 7. The mixing ratio of the flocculating agent to the slurry is 1: 400.
Example two
The embodiment provides a flocculant suitable for wet-process phosphoric acid production, which comprises a solution formed by mixing 60% of reflux water and 40% of process water, wherein the phosphorus content in the reflux water is 7100mg/L, and the fluorine content in the reflux water is 7000 mg/L; the phosphorus content in the solution is 3500mg/L, and the pH value of the solution is 4; the solution contains 2 per thousand mass concentration of polyacrylamide, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
The embodiment also provides an impurity settling system adopting the flocculant, wherein a slurry conveying pipeline 1 for injecting slurry is sequentially provided with at least two dissolving tanks 2, pressure pumps 3 and a filter 4, the dissolving tanks 2 are sequentially connected in series on the slurry conveying pipeline 1, and a flocculant adding tank 51 is arranged between the dissolving tank 2 and the pressure pump 3; the flocculant adding tank 51 is connected with a flocculant preparing tank 52, the flocculant preparing tank 52 is communicated with the flocculant adding tank 51 through a pipeline with a valve 53, and a stirring device is arranged in the flocculant preparing tank 52.
The flocculating agent adding tank 51 is internally provided with a flocculating agent, the flocculating agent contains polyacrylamide with the mass concentration of 2 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand. The phosphorus content in the flocculant is 3500mg/L, and the pH value of the flocculant is 4. The mixing ratio of the flocculating agent to the slurry is 1: 500.
EXAMPLE III
The embodiment provides a flocculant suitable for wet-process phosphoric acid production, which comprises a solution formed by mixing 65% of reflux water and 35% of process water, wherein the phosphorus content in the reflux water is 8100mg/L, and the fluorine content in the reflux water is 8000 mg/L; the phosphorus content in the solution is 4500mg/L, and the pH value of the solution is 2; the solution contains polyacrylamide with the mass concentration of 3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
The embodiment also provides an impurity settling system adopting the flocculant, wherein a slurry conveying pipeline 1 for injecting slurry is sequentially provided with at least two dissolving tanks 2, pressure pumps 3 and a filter 4, the dissolving tanks 2 are sequentially connected in series on the slurry conveying pipeline 1, and a flocculant adding tank 51 is arranged between the dissolving tank 2 and the pressure pump 3; the flocculant adding tank 51 is connected with a flocculant preparing tank 52, the flocculant preparing tank 52 is communicated with the flocculant adding tank 51 through a pipeline with a valve 53, and a stirring device is arranged in the flocculant preparing tank 52.
The flocculating agent adding tank 51 is internally provided with a flocculating agent, the flocculating agent contains polyacrylamide with the mass concentration of 3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand. The phosphorus content in the flocculant is 4500mg/L, and the pH value of the flocculant is 2. The mixing ratio of the flocculating agent to the slurry is 1: 600.
The application provides a flocculating agent and impurity precipitation system suitable for phosphoric acid by wet process production adopts the solvent that backflow water and industrial water mix as the flocculating agent, has effectively reduced the use amount of industrial water, has reduced sediment filtration cost. Meanwhile, ions containing phosphorus and fluorine introduce charges, so that polyacrylamide in the flocculating agent can keep sufficient dispersion under the mutual exclusion effect of the charges, and the subsequent treatment process is facilitated. Phosphorus is a raw material existing in the preparation of phosphoric acid all the time, so new impurities cannot be introduced by adopting the reflux water containing phosphorus, and the effect of flocculation and precipitation is ensured.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (8)
1. The flocculant suitable for wet-process phosphoric acid production is characterized by comprising a solution formed by mixing process water and return water, wherein the phosphorus content in the solution is 3000-4500mg/L, and the pH value of the solution is 2-7; the solution contains polyacrylamide with the mass concentration of 1.5-3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
2. The flocculant applicable to wet-process phosphoric acid production according to claim 1, wherein the solution is prepared by mixing 55-65% of return water and 35-45% of process water, and the phosphorus content in the return water is 6100-8100 mg/L.
3. The flocculant for wet-process phosphoric acid production according to claim 2, wherein the fluorine content in the return water is 6000-8000 mg/L.
4. An impurity settling system is characterized in that a dissolving tank, a pressure pump and a filter are sequentially arranged on a slurry conveying pipeline for injecting slurry, and a flocculating agent adding tank is arranged between the dissolving tank and the pressure pump; the flocculating agent adding tank is internally provided with a flocculating agent, the flocculating agent contains polyacrylamide with the mass concentration of 1.5-3 per thousand, and the molecular weight of the polyacrylamide is 500-800 ten thousand.
5. The impurity settling system of claim 4, wherein the phosphorus content of the flocculant is 3000-4500mg/L and the pH value of the flocculant is 1-3.
6. The impurity settling system as set forth in claim 4 or 5, wherein the mixing ratio of the flocculating agent to the slurry is 1: 400-600.
7. The impurity settling system as claimed in claim 4, wherein the flocculant adding tank is connected to a flocculant preparation tank, the flocculant preparation tank is communicated with the flocculant adding tank through a pipe with a valve, and a stirring device is provided in the flocculant preparation tank.
8. The impurity settling system of claim 4, wherein the number of said dissolving tanks is not less than two, and said dissolving tanks are connected in series in the slurry conveying line in turn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910893096.1A CN110548317A (en) | 2019-09-20 | 2019-09-20 | Flocculating agent and impurity sedimentation system suitable for wet-process phosphoric acid production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910893096.1A CN110548317A (en) | 2019-09-20 | 2019-09-20 | Flocculating agent and impurity sedimentation system suitable for wet-process phosphoric acid production |
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| CN110548317A true CN110548317A (en) | 2019-12-10 |
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| CN201910893096.1A Pending CN110548317A (en) | 2019-09-20 | 2019-09-20 | Flocculating agent and impurity sedimentation system suitable for wet-process phosphoric acid production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113479983A (en) * | 2021-08-20 | 2021-10-08 | 湖南江冶机电科技股份有限公司 | Use method of polyacrylamide as flocculating agent for lead plaster sedimentation in waste lead-acid storage battery |
| CN113880973A (en) * | 2021-08-20 | 2022-01-04 | 湖南江冶机电科技股份有限公司 | Preparation method of polyacrylamide for lead plaster sedimentation in lead-acid storage battery |
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| JPS5095197A (en) * | 1973-12-21 | 1975-07-29 | ||
| CN1113880A (en) * | 1994-06-01 | 1995-12-27 | 龚家竹 | Method for extracting phosphoric acid and solution containing phosphate by sulfuric acid method |
| CN1113879A (en) * | 1994-06-01 | 1995-12-27 | 龚家竹 | Method for extracting phosphoric acid by hydrochloric acid method |
| CN1683239A (en) * | 2004-04-16 | 2005-10-19 | 四川承源化工有限公司 | Method for producing phosphoric acid with low and medium grade phosphorous mine ore |
| CN101007626A (en) * | 2007-01-25 | 2007-08-01 | 黄尚勋 | Method for producing phosphate by wet method phosphoric acid purification and hydrochloric acid decomposition for phosphate ore |
| CN101746740A (en) * | 2009-12-23 | 2010-06-23 | 瓮福（集团）有限责任公司 | Method for improving solid content in phosphate concentrate ore pulp |
| CN102431978A (en) * | 2011-09-29 | 2012-05-02 | 瓮福（集团）有限责任公司 | Method for adding thickening diluent for concentrated phosphate pulp |
| CN103213964A (en) * | 2013-05-17 | 2013-07-24 | 成都川科化工有限公司 | Method for producing wet-process phosphoric acid by utilizing low-grade phosphorite |
| CN105481117A (en) * | 2016-01-22 | 2016-04-13 | 武汉强盛科技有限公司 | Improved medicament and chemical improvement method for wet method phosphoric acid concentration production |
| CN105712529A (en) * | 2016-03-29 | 2016-06-29 | 瓮福（集团）有限责任公司 | Method for treating high-concentration acidic wastewater containing fluorine and phosphorus |
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2019
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Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5095197A (en) * | 1973-12-21 | 1975-07-29 | ||
| CN1113880A (en) * | 1994-06-01 | 1995-12-27 | 龚家竹 | Method for extracting phosphoric acid and solution containing phosphate by sulfuric acid method |
| CN1113879A (en) * | 1994-06-01 | 1995-12-27 | 龚家竹 | Method for extracting phosphoric acid by hydrochloric acid method |
| CN1683239A (en) * | 2004-04-16 | 2005-10-19 | 四川承源化工有限公司 | Method for producing phosphoric acid with low and medium grade phosphorous mine ore |
| CN101007626A (en) * | 2007-01-25 | 2007-08-01 | 黄尚勋 | Method for producing phosphate by wet method phosphoric acid purification and hydrochloric acid decomposition for phosphate ore |
| CN101746740A (en) * | 2009-12-23 | 2010-06-23 | 瓮福（集团）有限责任公司 | Method for improving solid content in phosphate concentrate ore pulp |
| CN102431978A (en) * | 2011-09-29 | 2012-05-02 | 瓮福（集团）有限责任公司 | Method for adding thickening diluent for concentrated phosphate pulp |
| CN103213964A (en) * | 2013-05-17 | 2013-07-24 | 成都川科化工有限公司 | Method for producing wet-process phosphoric acid by utilizing low-grade phosphorite |
| CN105481117A (en) * | 2016-01-22 | 2016-04-13 | 武汉强盛科技有限公司 | Improved medicament and chemical improvement method for wet method phosphoric acid concentration production |
| CN105712529A (en) * | 2016-03-29 | 2016-06-29 | 瓮福（集团）有限责任公司 | Method for treating high-concentration acidic wastewater containing fluorine and phosphorus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113479983A (en) * | 2021-08-20 | 2021-10-08 | 湖南江冶机电科技股份有限公司 | Use method of polyacrylamide as flocculating agent for lead plaster sedimentation in waste lead-acid storage battery |
| CN113880973A (en) * | 2021-08-20 | 2022-01-04 | 湖南江冶机电科技股份有限公司 | Preparation method of polyacrylamide for lead plaster sedimentation in lead-acid storage battery |
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