CN115557719A - Comprehensive treatment method of phosphogypsum - Google Patents
Comprehensive treatment method of phosphogypsum Download PDFInfo
- Publication number
- CN115557719A CN115557719A CN202210980036.5A CN202210980036A CN115557719A CN 115557719 A CN115557719 A CN 115557719A CN 202210980036 A CN202210980036 A CN 202210980036A CN 115557719 A CN115557719 A CN 115557719A
- Authority
- CN
- China
- Prior art keywords
- washing
- water
- phosphogypsum
- filter
- drainage
- 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.)
- Granted
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
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
- C04B22/144—Phosphogypsum
-
- 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)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Paper (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a comprehensive treatment method of phosphogypsum, belonging to the technical field of wet-process phosphoric acid. The method comprises the following steps: (1) Collecting phosphogypsum, thickening the phosphogypsum by a thickener, and sending slurry obtained by thickening to a primary belt filter for treatment; (2) Filtering the slurry of the primary belt filter, and sending filter residues to the step (3) for treatment; (3) Re-pulping the filter residue, the re-pulping water and the lime milk to obtain phosphogypsum slurry, wherein the re-pulping water comprises filter-pressing filtrate and secondary filtering and washing drainage water; (4) Filtering the phosphogypsum slurry by a secondary belt filter, and combining the filtrate of the secondary belt filter with water washing drainage to be used as secondary filtering and washing drainage; in the step (2), collecting first-washing drainage water of the first-stage belt filter, and obtaining filter-pressing filtrate after gas-liquid separation, lime milk neutralization and filter pressing; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage.
Description
Technical Field
The invention belongs to the technical field of wet-process phosphoric acid, and particularly relates to a comprehensive treatment method of phosphogypsum, wherein the treated phosphogypsum can be used as a building raw material or a cement coagulant and the like.
Background
Phosphogypsum is an industrial byproduct gypsum generated in the production of high-concentration phosphorus compound fertilizer, and the main component of the phosphogypsum is calcium sulfate dihydrate (CaSO) 4 ·2H 2 O), 1 ton of phosphoric acid (100% by weight P) is prepared 2 O 5 Measured) to produce 4.8-5.0 tons of phosphogypsum, and the pressure of solid waste is very large, so the phosphogypsum needs to be treated in time. At present, phosphogypsum stacking of domestic manufacturers generally adopts two methods of wet discharging stacking and dry discharging and dry stacking.
Wet dumping: the filtering station of the phosphoric acid device adopts wet-method deslagging, phosphogypsum is firstly mixed with water to prepare phosphogypsum slag slurry with 70-80% of water, then the phosphogypsum slag slurry is pumped to a phosphogypsum tailing pond by adopting a one-stage or multi-stage pump according to the distance of conveying, and clear water after natural sedimentation is pumped to the phosphoric acid device by using water for reuse. The method is generally adopted by domestic large-scale wet-process phosphoric acid devices. The method has the advantages of high recovery rate of wastewater and phosphoric acid, environmental protection, energy conservation, convenient operation, low operating cost and the like.
Dry draining and piling: the dry discharging and dry piling process is the ardealite piling mode which is applied to the wet phosphoric acid production at first. The filtering station of the phosphoric acid device adopts dry-method deslagging, the phosphogypsum with the water content of less than 20 percent is conveyed to a phosphogypsum warehouse by a belt conveyor, and then an automobile or a belt conveyor is transported to a slag yard outside a plant area.
In the prior art, the phosphogypsum is treated by a filter press, the treatment capacity is very limited, and the production of megaton phosphoric acid by the company needs a great number of filter presses and is basically impossible to realize by equipping a great number of operators. In addition, only filter pressing treatment can not reduce the total phosphorus content of the phosphogypsum basically, thereby causing the waste of phosphorus elements and not utilizing the utilization of the phosphogypsum. The phosphogypsum treated only by dry discharge has high phosphorus content, very low pH value and more other impurities, is not accepted by cement factories, building material manufacturers and the like, and limits the approach of phosphogypsum utilization.
Disclosure of Invention
In order to solve the problems, the embodiment of the invention provides a comprehensive treatment method of phosphogypsum, which adopts a two-stage belt filter to treat the phosphogypsum, so that the water content is less than or equal to 20 percent, the total phosphorus is less than or equal to 1 percent, and the pH value is 6-8; the wastewater generated in the process is utilized in different modes, so that the phosphorus yield is improved, the wastewater discharge is reduced, and the use of water is reduced. The technical scheme is as follows:
the embodiment of the invention provides a comprehensive treatment method of phosphogypsum, which comprises the following steps:
(1) Collecting phosphogypsum and thickening the phosphogypsum by a thickener, taking clear liquid obtained by thickening as phosphogypsum backwater, and sending slurry obtained by thickening to a primary belt filter for treatment;
(2) Filtering the slurry obtained in the step (1) by using a primary belt filter, taking the filtrate as phosphogypsum backwater, and conveying the filter residue to the step (3) for treatment;
(3) Repulping the filter residue obtained in the step (2), repulping water and quick lime or lime milk to obtain phosphogypsum slurry, wherein the repulping water comprises filter pressing filtrate and secondary filtering and washing drainage water;
(4) Filtering the phosphogypsum slurry obtained in the step (3) by using a secondary belt filter, combining the filtrate of the secondary belt filter, the first washing drainage, the second washing drainage and the third washing drainage to obtain secondary filtering and washing drainage, and taking the filter residue as dry gypsum;
in the steps (2) and (4), after filtering, sequentially performing primary washing, secondary washing and tertiary washing by using primary washing water, secondary washing water and tertiary washing water respectively;
in the step (2), collecting first-washing drainage water of the first-stage belt filter, and obtaining filter-pressing filtrate after gas-liquid separation, adding quicklime or lime milk for neutralization and filter pressing; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage;
in the step (4), clear water is used as the first washing water, the second washing water and the third washing water.
Wherein, in the step (1), the density of the phosphogypsum is concentrated to 1.3-1.4g/mL by a thickener.
Wherein in the step (2), quicklime or lime milk is added into the first washing drainage water to adjust the pH value to 7-8.
Further, in the step (2), after the third washing, the filter belt is washed by primary washing water, primary washing water is collected and is settled, clear liquid is used as the primary washing water, and the slurry is sent to a feeding hole of the primary belt filter. In the step (4), the filter belt is washed by secondary washing water after the third washing, secondary washing drainage is collected and settled, clear liquid is used as the secondary washing water, and the slurry is sent to a feeding hole of a secondary belt filter.
Wherein, in the steps (2) and (4), the first washing water, the second washing water and the third washing water are heated to 50 ℃ or above.
Preferably, the condensed water generated during ammonium phosphate concentration is recovered, the condensed water is heated or not heated by steam to obtain hot water, and the hot water is mixed with the first washing water, the second washing water, the third washing water, the first washing water and the second washing water.
Wherein, in the step (3), the pH value of the phosphogypsum slurry is adjusted to 6-8, and the density is adjusted to 1.3-1.4g/mL.
Further, in the steps (2) and (4), gas is condensed through a condenser after gas-liquid separation, a water cooling tower and the condenser form a circulating cooling system, and filter-pressing filtrate is used as water supplement of the circulating cooling system.
Preferably, lime milk is adopted in the steps (2) and (4), and the lime milk is prepared from quicklime and filter pressing filtrate.
Specifically, the comprehensive treatment method of phosphogypsum provided by the embodiment of the invention comprises the following steps:
(1) Collecting phosphogypsum, concentrating the density of the phosphogypsum to 1.3-1.4g/mL by a thickener, taking clear liquid obtained by thickening as phosphogypsum backwater, and sending slurry obtained by thickening to a first-stage belt filter for treatment;
(2) Filtering the slurry obtained in the step (1) by using a primary belt filter, taking the filtrate as the phosphogypsum backwater, and sending the filter residue to the step (3) for treatment;
(3) Repulping the filter residue obtained in the step (2), repulping water and lime milk to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the repulping water comprises filter pressing filtrate and secondary filtering and washing drainage water;
(4) Filtering the phosphogypsum slurry obtained in the step (3) by using a secondary belt filter, combining the filtrate of the secondary belt filter, the first washing drainage, the second washing drainage and the third washing drainage to obtain secondary filtering and washing drainage, and taking the filter residue as dry gypsum;
in the steps (2) and (4), after filtering, sequentially performing primary washing, secondary washing and tertiary washing by using primary washing water, secondary washing water and tertiary washing water respectively;
in the step (2), collecting first washing drainage water of the first-stage belt filter, carrying out gas-liquid separation, adding lime milk for neutralization until the pH value is 7-8, and carrying out filter pressing to obtain filter pressing filtrate; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage;
in the step (4), clear water is used as the first washing water, the second washing water and the third washing water.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
(1) The parameters of the treated phosphogypsum are as follows: the water content is less than or equal to 20 percent, the total phosphorus is less than or equal to 1 percent, and the pH value is 6-8;
(2) The treatment capacity is large, four primary belt filters (the model is HDJD-120) are matched with four secondary belt filters (the model is HDJD-120) for use, the treatment capacity reaches 500 ten thousand tons/year, and very few operators are needed;
(3) The wastewater generated in the process is utilized in different modes, so that the phosphorus yield is improved, the wastewater discharge is reduced, and the use of water is reduced;
(4) Different treatment modes are adopted for the first washing drainage, the second washing drainage and the third washing drainage of the two-stage belt filter, so that the use of water resources can be reduced while the washing effect is ensured;
(5) The first-stage filtration is carried out with three times of water washing, the second-stage filtration is also carried out with three times of water washing, and the washing liquid is neutral or alkaline, so that part of phosphorus elements and other impurities can be washed out, the treatment of the phosphogypsum is more convenient, the phosphogypsum can be received by cement factories and the like, the utilization path of the phosphogypsum is expanded, and the phosphogypsum can be used as building materials and cement coagulants;
(6) Compared with the conventional filter press, the belt filter has the advantages of high automation degree (such as automatic slag discharge, automatic washing and the like).
(7) Impurities such as phosphorus in the washing water can be settled through lime, and the washing water is alkaline so as to improve the washing effect;
(8) The filter-pressing filtrate can be consumed in various ways, including as triple wash water, as make-up water for a cooling tower, and for dissolving lime milk, etc., and make-up water and heat by adding hot water. The washing effect of condensed water (cleaner, alkalescent and high temperature) generated when ammonium phosphate is used for concentrating hot water is better;
(9) The third washing water and the repulping water adopt filter pressing filtrate and second-stage filter washing drainage, and balance can be carried out as required.
Drawings
FIG. 1 is a schematic block diagram of a comprehensive treatment method of phosphogypsum in an embodiment of the invention;
FIG. 2 is a schematic structural view of a single-stage belt filter;
FIG. 3 is a schematic structural view of a two-stage belt filter.
In the figure: 1 filtering area, 2 first washing area, 3 second washing area and 4 third washing area.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, example 1 provides a comprehensive treatment method of phosphogypsum, which comprises:
(1) Collecting phosphogypsum and thickening the phosphogypsum by a thickener, taking clear liquid obtained by thickening as phosphogypsum backwater, and sending slurry obtained by thickening to a first-stage belt filter for treatment.
(2) And (3) filtering the slurry obtained in the step (1) by using a primary belt filter, taking the filtrate as the phosphogypsum backwater, and sending the filter residue to the step (3) for treatment.
(3) Re-pulping the filter residue obtained in the step (2), re-pulping water and quicklime or lime milk to obtain phosphogypsum slurry, wherein the re-pulping water comprises filter-pressing filtrate and secondary filtering and washing drainage water.
(4) And (4) filtering the phosphogypsum slurry obtained in the step (3) by using a secondary belt filter, combining the filtrate of the secondary belt filter, the first washing drainage, the second washing drainage and the third washing drainage to obtain secondary filtering and washing drainage, and taking the filter residue as dry gypsum.
In the steps (2) and (4), after filtering, sequentially performing primary washing, secondary washing and tertiary washing by using primary washing water, secondary washing water and tertiary washing water respectively;
in the step (2), collecting the first-stage washing drainage of the first-stage belt filter, and performing gas-liquid separation, adding quicklime or lime milk for neutralization and filter pressing (filter residues obtained by filter pressing are used as the ardealite which cannot be treated any more for landfill or wet stacking, the amount is very small, and the damage to the environment is small) to obtain filter pressing filtrate; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage.
In the step (4), in order to ensure the cleaning effect, clean water is adopted as the first washing water, the second washing water and the third washing water.
The method is characterized in that the structure of the belt filter is improved, a filter area 1, a first washing area 2, a second washing area 3 and a third washing area 4 are sequentially arranged on a conveyor belt along the conveying direction, a washing water spray head, a washing water collecting tank, a liquid discharge tank and the like are arranged on the first washing area 2, the second washing area 3 and the third washing area 4 in a matched mode, the washing water spray head is located right above the filter belt and sprays washing water to the filter belt, the washing water collecting tank is located adjacent to and below the filter belt and used for collecting washing water and discharging water, the washing water collecting tank is connected with the liquid discharge tank through a pipeline, and the liquid discharge tank is used for achieving gas-liquid separation; the liquid discharge tank is connected with a condensation vacuum system through a pipeline and is used for vacuumizing (-60 to-70 KPa).
Wherein, the indexes of the phosphogypsum generated by wet-process phosphoric acid are as follows: the pH value is 2-3, the total phosphorus is 1.5-2.0%, the water content is 65-70%, and the thickness of the filter cake is 25-35mm.
Wherein, in the step (1), the density of the phosphogypsum is concentrated to 1.3-1.4g/mL by a thickener.
Wherein, in the step (2), quicklime or lime milk is added into the washing drainage water to adjust the pH value to 7-8, and in order to realize automatic conditions, lime milk is preferred.
Further, in the step (2), the filter belt is washed by primary washing water after the third washing, primary washing drainage is collected and is settled, clear liquid is used as the primary washing water, and the slurry is sent to a feeding hole of the primary belt filter. Specifically, the wastewater may be collected and settled by a primary washing water settling tank, and the clear liquid may be stored by a primary filter cloth flushing tank. In the step (4), the filter belt is washed by secondary washing water after the third washing, secondary washing drainage is collected and settled, clear liquid is used as the secondary washing water, and the slurry is sent to a feeding hole of a secondary belt filter. Accordingly, a secondary flush water settling tank and a secondary filter cloth flushing tank are included.
Wherein, in the steps (2) and (4), the first washing water, the second washing water and the third washing water are heated to 50 ℃ or above. A heating water tank or a pipe heater is provided accordingly to secure the temperature of the washing water.
Preferably, the condensed water (having a relatively high temperature and being weakly alkaline) at the time of ammonium phosphate concentration (e.g., multi-effect evaporator) is recovered, the condensed water is heated (by low-pressure steam) or not heated by steam to obtain hot water (preferably 70 ℃ or more), and the hot water is mixed with the first washing water, the second washing water, the third washing water, the first washing water and the second washing water as needed to heat the first washing water, the second washing water, the third washing water and the washing water. The hot water is alkalescent and has better flushing effect.
Wherein, in the step (3), the pH value of the phosphogypsum slurry is adjusted to 6-8, and the density is adjusted to 1.3-1.4g/mL.
Further, in the steps (2) and (4), gas is condensed through a condenser after gas-liquid separation, a water cooling tower and the condenser form a circulating cooling system, and filter-pressing filtrate is used as water supplement of the circulating cooling system.
Preferably, lime milk is adopted in the steps (2) and (4), and the lime milk is prepared from quicklime and filter pressing filtrate.
Specifically, the comprehensive treatment method of phosphogypsum provided by the embodiment of the invention comprises the following steps:
(1) Collecting phosphogypsum, concentrating the density of the phosphogypsum to 1.3-1.4g/mL by a thickener, taking clear liquid obtained by thickening as phosphogypsum backwater, and sending slurry obtained by thickening to a first-stage belt filter for treatment.
(2) And (3) filtering the slurry obtained in the step (1) by using a primary belt filter, taking the filtrate as the phosphogypsum backwater, and sending the filter residue to the step (3) for treatment.
(3) Repulping the filter residue obtained in the step (2), repulping water and lime milk to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the repulping water comprises filter pressing filtrate and secondary filtering and washing drainage water.
(4) And (4) filtering the phosphogypsum slurry obtained in the step (3) by using a secondary belt filter, combining the filtrate of the secondary belt filter, the first washing drainage, the second washing drainage and the third washing drainage to obtain secondary filtering and washing drainage, and taking the filter residue as dry gypsum.
In the steps (2) and (4), after filtering, sequentially performing primary washing, secondary washing and tertiary washing by using primary washing water, secondary washing water and tertiary washing water respectively;
in the step (2), collecting first washing drainage water of the first-stage belt filter, carrying out gas-liquid separation, adding lime milk for neutralization until the pH value is 7-8, and carrying out filter pressing to obtain filter pressing filtrate; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage.
In the step (4), clear water is used as the first washing water, the second washing water and the third washing water.
Example 2
Referring to fig. 1-3, example 2 provides a comprehensive treatment method of phosphogypsum, which comprises:
(1) Collecting phosphogypsum by a phosphogypsum collecting tank, concentrating the density of the phosphogypsum to 1.3-1.4g/mL by a thickener, sending the concentrated clear liquid to an overflow water tank to be used as phosphogypsum backwater, and sending the concentrated slurry to a primary belt filter for treatment.
(2) And (2) filtering the slurry obtained in the step (1) by using a primary belt filter, carrying out gas-liquid separation on the filtrate through a primary liquid discharge tank to obtain phosphogypsum backwater, and conveying the filter residue to the step (3) for treatment.
(3) Re-pulping the filter residue obtained in the step (2), re-pulping water and lime milk in a re-pulping neutralization tank to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the re-pulping water comprises filter-pressing filtrate (from a filter-pressing liquid storage tank) and secondary filter-washing drainage water (from a secondary filtrate collecting tank).
(4) And (3) filtering the phosphogypsum slurry obtained in the step (3), merging filtrate (sent to a first second-stage liquid discharge tank for gas-liquid separation), first washing drainage (sent to a second-stage liquid discharge tank for gas-liquid separation), second washing drainage (sent to a third second-stage liquid discharge tank for gas-liquid separation) and third washing drainage (sent to a fourth second-stage liquid discharge tank for gas-liquid separation) of the second-stage belt filter as second-stage filtering and washing drainage (sent to a second-stage filtrate collecting tank for storage), wherein filter residues are dry gypsum.
In steps (2) and (4), the slurry/gypsum slurry is filtered in the filtering zone 1, the first washing is performed by the first washing water in the first washing zone 2, the second washing is performed by the second washing water in the second washing zone 3, the third washing is performed by the third washing water in the third washing zone 4, and the filter belt is washed by the washing water at the lower side of the rear end of the filter belt.
In the step (2), collecting washing drainage water of the primary belt filter through a second primary drainage tank, performing gas-liquid separation through the second primary drainage tank, adding lime milk into a primary buffer tank to neutralize the washing drainage water to a pH value of 7-8, and performing filter pressing through a filter press to obtain filter pressing filtrate (sending the filter pressing filtrate to a filter pressing liquid storage tank for storage); collecting second washing drainage water through a third first-stage drainage tank, and performing gas-liquid separation through the third first-stage drainage tank to obtain first washing water (roots need to be heated); collecting the third washing drainage water through a fourth first-stage drainage tank, and performing gas-liquid separation through the fourth first-stage drainage tank to obtain second washing water (the roots need to be heated); the three-stage washing water (the root needs to be heated) comprises filter pressing filtrate and secondary filtering washing drainage.
In the step (4), in the filtering area 1, filtrate is collected through a first secondary liquid discharge tank; performing primary washing in the primary washing area 2 by using clean water, and collecting primary washing drainage water by using a second secondary drainage tank; secondary washing is carried out in the secondary washing area 3 through clear water, and secondary washing drainage is collected through a third secondary liquid discharge tank; performing third washing in the third washing area 4 by using clean water, and collecting third washing drainage water by using a fourth secondary drainage tank; the filter belt is washed by the washing water at the lower side of the rear end of the filter belt. And after gas-liquid separation is carried out on the first second-stage liquid discharge tank, the second-stage liquid discharge tank, the third second-stage liquid discharge tank and the fourth second-stage liquid discharge tank, liquid is collected in a second-stage filtrate collecting tank.
The first, second, third and fourth elements in this embodiment are only used for distinguishing, and have no other special meaning.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The comprehensive treatment method of the phosphogypsum is characterized by comprising the following steps:
(1) Collecting phosphogypsum and thickening the phosphogypsum by a thickener, taking clear liquid obtained by thickening as phosphogypsum backwater, and sending slurry obtained by thickening to a primary belt filter for treatment;
(2) Filtering the slurry obtained in the step (1) by using a primary belt filter, taking the filtrate as the phosphogypsum backwater, and sending the filter residue to the step (3) for treatment;
(3) Repulping the filter residue obtained in the step (2), repulping water and quick lime or lime milk to obtain phosphogypsum slurry, wherein the repulping water comprises filter pressing filtrate and secondary filtering and washing drainage water;
(4) Filtering the phosphogypsum slurry obtained in the step (3) by using a secondary belt filter, combining the filtrate of the secondary belt filter, the first washing drainage, the second washing drainage and the third washing drainage to obtain secondary filtering and washing drainage, and taking the filter residue as dry gypsum;
in the steps (2) and (4), after filtration, sequentially performing primary washing, secondary washing and tertiary washing by using primary washing water, secondary washing water and tertiary washing water respectively;
in the step (2), collecting first washing drainage water of the first-stage belt filter, and obtaining filter-pressing filtrate after gas-liquid separation, adding quicklime or lime milk for neutralization and filter pressing; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage;
in the step (4), clear water is used as the first washing water, the second washing water and the third washing water.
2. The integrated phosphogypsum treatment process according to claim 1, characterized in that in step (1), the densifier concentrates the density of phosphogypsum to 1.3-1.4g/mL.
3. The integrated phosphogypsum treatment process according to claim 1, characterized in that in step (2), quicklime or lime milk is added to the washing effluent to adjust the pH value to 7-8.
4. The comprehensive treatment method of phosphogypsum according to claim 1, characterized in that in the step (2), the filter belt is washed by primary washing water after the third washing, primary washing drainage is collected and settled, clear liquid is taken as primary washing water, and the slurry is sent to the feeding port of the primary belt filter; in the step (4), the filter belt is washed by secondary washing water after the third washing, secondary washing drainage is collected and settled, clear liquid is used as the secondary washing water, and the slurry is sent to a feeding hole of a secondary belt filter.
5. The integrated phosphogypsum treatment process according to claim 4, characterized in that in steps (2) and (4), the first, second and third washing waters are heated to 50 ℃ and above.
6. The comprehensive treatment method of phosphogypsum according to claim 5, characterized in that the condensed water from ammonium phosphate concentration is recovered, the condensed water is heated or not by steam to obtain hot water, and the hot water is mixed with the first washing water, the second washing water, the third washing water, the first washing water and the second washing water.
7. The integrated phosphogypsum treatment process according to claim 1, characterized in that in step (3), the pH of the phosphogypsum slurry is adjusted to 6-8 and the density is adjusted to 1.3-1.4g/mL.
8. The comprehensive treatment method of phosphogypsum according to claim 1, characterized in that in the steps (2) and (4), the gas is condensed by a condenser after gas-liquid separation, a water cooling tower and the condenser form a circulating cooling system, and the filter-pressing filtrate is used as the water supplement of the circulating cooling system.
9. The comprehensive treatment method of phosphogypsum as claimed in claim 1, characterized in that lime milk is adopted in steps (2) and (4), and the lime milk is prepared from quicklime and filter-pressing filtrate.
10. The integrated phosphogypsum treatment process according to claim 1, characterized in that it comprises:
(1) Collecting phosphogypsum, concentrating the density of the phosphogypsum to 1.3-1.4g/mL by a thickener, taking clear liquid obtained by thickening as phosphogypsum backwater, and sending slurry obtained by thickening to a primary belt filter for treatment;
(2) Filtering the slurry obtained in the step (1) by using a primary belt filter, taking the filtrate as the phosphogypsum backwater, and sending the filter residue to the step (3) for treatment;
(3) Repulping the filter residue obtained in the step (2), repulping water and lime milk to obtain phosphogypsum slurry with the pH value of 6-8 and the density of 1.3-1.4g/mL, wherein the repulping water comprises filter pressing filtrate and secondary filtering and washing drainage water;
(4) Filtering the phosphogypsum slurry obtained in the step (3) by using a secondary belt filter, combining the filtrate of the secondary belt filter, the first washing drainage, the second washing drainage and the third washing drainage to obtain secondary filtering and washing drainage, and taking the filter residue as dry gypsum;
in the steps (2) and (4), after filtering, sequentially performing primary washing, secondary washing and tertiary washing by using primary washing water, secondary washing water and tertiary washing water respectively;
in the step (2), collecting first washing drainage water of the first-stage belt filter, carrying out gas-liquid separation, adding lime milk for neutralization until the pH value is 7-8, and carrying out filter pressing to obtain filter pressing filtrate; collecting the second washing drainage, and using the second washing drainage as first washing water after gas-liquid separation; collecting the third washing drainage, and performing gas-liquid separation to obtain second washing water; the third washing water comprises filter pressing filtrate and second-stage filtering washing drainage;
in the step (4), clear water is used as the first washing water, the second washing water and the third washing water.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210980036.5A CN115557719B (en) | 2022-08-16 | 2022-08-16 | Comprehensive treatment method of phosphogypsum |
| PCT/CN2023/109237 WO2024037298A1 (en) | 2022-08-16 | 2023-07-26 | Integrated treatment method for phosphogypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210980036.5A CN115557719B (en) | 2022-08-16 | 2022-08-16 | Comprehensive treatment method of phosphogypsum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115557719A true CN115557719A (en) | 2023-01-03 |
| CN115557719B CN115557719B (en) | 2023-08-15 |
Family
ID=84739172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210980036.5A Active CN115557719B (en) | 2022-08-16 | 2022-08-16 | Comprehensive treatment method of phosphogypsum |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115557719B (en) |
| WO (1) | WO2024037298A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024037298A1 (en) * | 2022-08-16 | 2024-02-22 | 湖北祥云(集团)化工股份有限公司 | Integrated treatment method for phosphogypsum |
Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0812389A (en) * | 1994-06-28 | 1996-01-16 | Mitsubishi Heavy Ind Ltd | Method for separating and recovering low grade gypsum |
| JP2004299962A (en) * | 2003-03-31 | 2004-10-28 | Central Res Inst Of Electric Power Ind | Method for removing fluorine in gypsum |
| CN1876204A (en) * | 2006-07-06 | 2006-12-13 | 上海南化水处理技术工程有限公司 | Ardealite innocent treatment method |
| CN1994872A (en) * | 2006-12-21 | 2007-07-11 | 四川大学 | Technology for preparing fine calcium phosphate using phosphor-gypsum backwater and its wash liquid |
| CN103482667A (en) * | 2013-09-23 | 2014-01-01 | 瓮福（集团）有限责任公司 | Quick and efficient purifying method for phosphogypsum |
| CN104230193A (en) * | 2014-08-18 | 2014-12-24 | 中国海洋石油总公司 | Method for recycling phosphogypsum solid waste |
| CN105399071A (en) * | 2015-12-14 | 2016-03-16 | 湖北华毅化工有限公司 | Ammonium phosphate production technology and system |
| CN205110340U (en) * | 2015-10-23 | 2016-03-30 | 湖北祥云(集团)化工股份有限公司 | Responsibility is arranged all to ardealite |
| CN205472669U (en) * | 2015-12-14 | 2016-08-17 | 湖北国抒特化工实业有限公司 | Ammonium phosphate production system |
| CN107055600A (en) * | 2016-08-31 | 2017-08-18 | 襄阳龙蟒钛业有限公司 | Two washing lotion recoverying and utilizing method in a kind of method for producing gtitanium dioxide with sulphuric acid |
| CN207451624U (en) * | 2017-11-21 | 2018-06-05 | 宜昌鄂中化工有限公司 | A kind of acid production with sulphur waste heat is used for the device of ardealite comprehensive utilization |
| CN207671688U (en) * | 2017-12-06 | 2018-07-31 | 云南澄江天辰磷肥有限公司 | A kind of wash mill in phosphoric acid filtration system |
| CN108842073A (en) * | 2018-06-01 | 2018-11-20 | 青海华信环保科技有限公司 | A kind of method of alkaline process processing zinc cadmium slag |
| CN110451470A (en) * | 2019-09-20 | 2019-11-15 | 瓮福达州化工有限责任公司 | Countercurrent washing system and method in a kind of wet method phosphoric acid manufacture process |
| CN110510589A (en) * | 2019-09-10 | 2019-11-29 | 湖北祥云(集团)化工股份有限公司 | A kind of Wet-process Phosphoric Acid Production method and production system |
| CN210030077U (en) * | 2019-05-21 | 2020-02-07 | 武汉江汉化工设计有限公司 | Phosphogypsum purification treatment system |
| CN210974194U (en) * | 2019-09-10 | 2020-07-10 | 湖北祥云(集团)化工股份有限公司 | Comprehensive utilization system for phosphogypsum backwater |
| CN210973892U (en) * | 2019-09-10 | 2020-07-10 | 湖北祥云(集团)化工股份有限公司 | Environment-friendly phosphoric acid filtration system |
| CN111908813A (en) * | 2020-08-17 | 2020-11-10 | 云南磷化集团有限公司 | Phosphogypsum pretreatment purification method |
| CN111977625A (en) * | 2020-09-22 | 2020-11-24 | 瓮福（集团）有限责任公司 | Two-stage dihydrate wet-process phosphoric acid production process |
| CN112794754A (en) * | 2020-12-15 | 2021-05-14 | 安徽六国化工股份有限公司 | Method for purifying phosphogypsum by leaching water and jointly producing water-soluble fertilizer and liquid fertilizer |
| CN112978781A (en) * | 2021-04-13 | 2021-06-18 | 中国五环工程有限公司 | Phosphogypsum harmless treatment method |
| CN213738621U (en) * | 2020-08-21 | 2021-07-20 | 湖北六国化工股份有限公司 | Phosphoric acid washing system |
| CN213792104U (en) * | 2020-09-27 | 2021-07-27 | 湖北祥云(集团)化工股份有限公司 | Phosphorus ore grade grading plant |
| CN115625181A (en) * | 2022-08-16 | 2023-01-20 | 湖北祥云(集团)化工股份有限公司 | Phosphogypsum harmless treatment system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL116006B1 (en) * | 1978-05-06 | 1981-05-30 | Politechnika Wroclawska | Method of waste phosphogypsum rinsing |
| JP4050864B2 (en) * | 2000-08-21 | 2008-02-20 | 株式会社トクヤマ | Method for producing calcium chloride aqueous solution |
| CN115557719B (en) * | 2022-08-16 | 2023-08-15 | 湖北祥云(集团)化工股份有限公司 | Comprehensive treatment method of phosphogypsum |
-
2022
- 2022-08-16 CN CN202210980036.5A patent/CN115557719B/en active Active
-
2023
- 2023-07-26 WO PCT/CN2023/109237 patent/WO2024037298A1/en unknown
Patent Citations (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0812389A (en) * | 1994-06-28 | 1996-01-16 | Mitsubishi Heavy Ind Ltd | Method for separating and recovering low grade gypsum |
| JP2004299962A (en) * | 2003-03-31 | 2004-10-28 | Central Res Inst Of Electric Power Ind | Method for removing fluorine in gypsum |
| CN1876204A (en) * | 2006-07-06 | 2006-12-13 | 上海南化水处理技术工程有限公司 | Ardealite innocent treatment method |
| CN1994872A (en) * | 2006-12-21 | 2007-07-11 | 四川大学 | Technology for preparing fine calcium phosphate using phosphor-gypsum backwater and its wash liquid |
| CN103482667A (en) * | 2013-09-23 | 2014-01-01 | 瓮福（集团）有限责任公司 | Quick and efficient purifying method for phosphogypsum |
| CN104230193A (en) * | 2014-08-18 | 2014-12-24 | 中国海洋石油总公司 | Method for recycling phosphogypsum solid waste |
| CN205110340U (en) * | 2015-10-23 | 2016-03-30 | 湖北祥云(集团)化工股份有限公司 | Responsibility is arranged all to ardealite |
| CN105399071A (en) * | 2015-12-14 | 2016-03-16 | 湖北华毅化工有限公司 | Ammonium phosphate production technology and system |
| CN205472669U (en) * | 2015-12-14 | 2016-08-17 | 湖北国抒特化工实业有限公司 | Ammonium phosphate production system |
| CN107055600A (en) * | 2016-08-31 | 2017-08-18 | 襄阳龙蟒钛业有限公司 | Two washing lotion recoverying and utilizing method in a kind of method for producing gtitanium dioxide with sulphuric acid |
| CN207451624U (en) * | 2017-11-21 | 2018-06-05 | 宜昌鄂中化工有限公司 | A kind of acid production with sulphur waste heat is used for the device of ardealite comprehensive utilization |
| CN207671688U (en) * | 2017-12-06 | 2018-07-31 | 云南澄江天辰磷肥有限公司 | A kind of wash mill in phosphoric acid filtration system |
| CN108842073A (en) * | 2018-06-01 | 2018-11-20 | 青海华信环保科技有限公司 | A kind of method of alkaline process processing zinc cadmium slag |
| CN210030077U (en) * | 2019-05-21 | 2020-02-07 | 武汉江汉化工设计有限公司 | Phosphogypsum purification treatment system |
| CN110510589A (en) * | 2019-09-10 | 2019-11-29 | 湖北祥云(集团)化工股份有限公司 | A kind of Wet-process Phosphoric Acid Production method and production system |
| CN210974194U (en) * | 2019-09-10 | 2020-07-10 | 湖北祥云(集团)化工股份有限公司 | Comprehensive utilization system for phosphogypsum backwater |
| CN210973892U (en) * | 2019-09-10 | 2020-07-10 | 湖北祥云(集团)化工股份有限公司 | Environment-friendly phosphoric acid filtration system |
| CN110451470A (en) * | 2019-09-20 | 2019-11-15 | 瓮福达州化工有限责任公司 | Countercurrent washing system and method in a kind of wet method phosphoric acid manufacture process |
| CN111908813A (en) * | 2020-08-17 | 2020-11-10 | 云南磷化集团有限公司 | Phosphogypsum pretreatment purification method |
| CN213738621U (en) * | 2020-08-21 | 2021-07-20 | 湖北六国化工股份有限公司 | Phosphoric acid washing system |
| CN111977625A (en) * | 2020-09-22 | 2020-11-24 | 瓮福（集团）有限责任公司 | Two-stage dihydrate wet-process phosphoric acid production process |
| CN213792104U (en) * | 2020-09-27 | 2021-07-27 | 湖北祥云(集团)化工股份有限公司 | Phosphorus ore grade grading plant |
| CN112794754A (en) * | 2020-12-15 | 2021-05-14 | 安徽六国化工股份有限公司 | Method for purifying phosphogypsum by leaching water and jointly producing water-soluble fertilizer and liquid fertilizer |
| CN112978781A (en) * | 2021-04-13 | 2021-06-18 | 中国五环工程有限公司 | Phosphogypsum harmless treatment method |
| CN115625181A (en) * | 2022-08-16 | 2023-01-20 | 湖北祥云(集团)化工股份有限公司 | Phosphogypsum harmless treatment system |
Non-Patent Citations (3)
| Title |
|---|
| 伍佳;: "钛白废水综合治理工艺探讨", 广东化工, no. 07 * |
| 侯佳荣;: "含油污泥压滤处理技术的试验研究", 石油石化节能, no. 03 * |
| 胡成军;: "磷石膏水洗净化试验及工艺", 磷肥与复肥, no. 05 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024037298A1 (en) * | 2022-08-16 | 2024-02-22 | 湖北祥云(集团)化工股份有限公司 | Integrated treatment method for phosphogypsum |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024037298A1 (en) | 2024-02-22 |
| CN115557719B (en) | 2023-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105036101A (en) | Semi-hydrated-two-hydrated wet process phosphoric acid production process and system thereof | |
| CA2606312A1 (en) | System and method for treating tailings | |
| CN105000585B (en) | In ardealite and purification process technique | |
| CN103213961B (en) | Closed cyclic utilization method for production water of monoammonium phosphate | |
| CN204079743U (en) | A kind of Technique of Coal Mine Drainage sludge treatment equipment | |
| CN102849814B (en) | Treatment method for purifying sewage and tail gas from furnace gas in acid production from gypsum | |
| WO2024037298A1 (en) | Integrated treatment method for phosphogypsum | |
| CN101423203B (en) | Water-saving and emission-reducing wet method phosphoric acid manufacture process | |
| CN106395775A (en) | Method for filtering phosphoric acid extraction slurry | |
| CN204873846U (en) | Half water - no. 2 water law phosphoric acid by wet process production system | |
| CN101798768B (en) | Waste paper regeneration environmental protection device and method | |
| CN210974194U (en) | Comprehensive utilization system for phosphogypsum backwater | |
| CN110510589A (en) | A kind of Wet-process Phosphoric Acid Production method and production system | |
| CN115625181A (en) | Phosphogypsum harmless treatment system | |
| CN210973888U (en) | Wet process phosphoric acid production system | |
| CN110756027B (en) | Promote low-cost desulfurization waste water zero discharge system of gypsum quality | |
| CN209113637U (en) | Gypsum stack percolation liquid treating system | |
| CN103304072B (en) | Recycling method of industrial waste water | |
| CN208166579U (en) | Wet phosphoric acid purifying process for producing system | |
| CN101323441B (en) | Reclaiming method of wet method phosphoric acid ardealite storage yard eluviate water | |
| CN210964210U (en) | Phosphoric acid carousel vacuum filter equipment of difficult scale deposit | |
| CN205110340U (en) | Responsibility is arranged all to ardealite | |
| CN202181214U (en) | Device for using tail gas washing objects for ammonium phosphate production | |
| CN109095483A (en) | A kind of system and its application method of oxalate precipitation method recycling power plant desulfurization wastewater calcium and magnesium | |
| CN210973892U (en) | Environment-friendly phosphoric acid filtration system |
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 |