CN111659549A - Method for grading and utilizing reverse flotation phosphate concentrate pulp - Google Patents
Method for grading and utilizing reverse flotation phosphate concentrate pulp Download PDFInfo
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- CN111659549A CN111659549A CN202010519277.0A CN202010519277A CN111659549A CN 111659549 A CN111659549 A CN 111659549A CN 202010519277 A CN202010519277 A CN 202010519277A CN 111659549 A CN111659549 A CN 111659549A
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- 239000012141 concentrate Substances 0.000 title claims abstract description 101
- 238000005188 flotation Methods 0.000 title claims abstract description 80
- 229910019142 PO4 Inorganic materials 0.000 title claims abstract description 46
- 239000010452 phosphate Substances 0.000 title claims abstract description 46
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 14
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 239000011574 phosphorus Substances 0.000 claims abstract description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 7
- 239000010865 sewage Substances 0.000 claims abstract description 7
- 239000002893 slag Substances 0.000 claims abstract description 7
- 239000011734 sodium Substances 0.000 claims abstract description 7
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000003112 inhibitor Substances 0.000 claims abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 60
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 29
- 239000002002 slurry Substances 0.000 claims description 19
- 239000002562 thickening agent Substances 0.000 claims description 18
- 239000006260 foam Substances 0.000 claims description 12
- 230000008719 thickening Effects 0.000 claims description 12
- 239000002686 phosphate fertilizer Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000003337 fertilizer Substances 0.000 claims description 6
- -1 phosphorus compound Chemical class 0.000 claims description 6
- 230000002000 scavenging effect Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 230000001089 mineralizing effect Effects 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000002253 acid Substances 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 239000005696 Diammonium phosphate Substances 0.000 description 8
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 8
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 8
- 235000019838 diammonium phosphate Nutrition 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 235000015097 nutrients Nutrition 0.000 description 6
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 5
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 5
- 235000019837 monoammonium phosphate Nutrition 0.000 description 5
- 239000006012 monoammonium phosphate Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 239000002367 phosphate rock Substances 0.000 description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
- B03D1/021—Froth-flotation processes for treatment of phosphate ores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D2203/00—Specified materials treated by the flotation agents; Specified applications
- B03D2203/02—Ores
- B03D2203/04—Non-sulfide ores
- B03D2203/06—Phosphate ores
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention provides a method for grading and utilizing reverse flotation phosphate concentrate pulp, and relates to the technical field of phosphate concentrate pulp grading. The method comprises the following steps: s1, crushing and grinding raw ore containing high carbonate impurities, ensuring that the grinding fineness is-200 meshes and is more than 80%, fully dissociating phosphorus minerals, carbonate and other gangue minerals, and controlling the concentration of selected ore pulp to be 25-28 wt%; s2, conveying the ore pulp into a first flotation stirring tank and a second flotation stirring tank for treatment, and adding an inhibitor regulator sulfuric acid, sodium fluosilicate sewage and slag storage backwater into the first stirring tank to control the pH value of the ore pulp to be 4.0-4.5. The invention is based on the rough concentrate obtained by the reverse flotation rough concentration of the flotation column, and the grading phosphate concentrate with higher quality and lower MER value and the overflow concentrate with slightly inferior quality and slightly higher MER value are obtained by cyclone grading again, so that the quality grading of the phosphate concentrate is realized, the differential production of acid making is realized, and the purposes of optimizing the ore, using the grading, improving the quality and reducing the cost are achieved.
Description
Technical Field
The invention relates to the technical field of phosphate concentrate pulp grading, in particular to a method for grading and utilizing reverse flotation phosphate concentrate pulp.
Background
The phosphate concentrate pulp is a main raw material for producing wet-process phosphoric acid, and the quality of the phosphate concentrate pulp and the solid content are very important for producing the wet-process phosphoric acid and are important factors for determining the acidity of the phosphoric acid, controlling the water balance of the phosphoric acid and improving the yield of the phosphorus. With the rapid development of the phosphate fertilizer industry, the usage of phosphate ore is increased rapidly, the overall grade of the phosphate ore is reduced day by day, the impurity content is increased continuously, the MER value is increased, so that the impurity components in the phosphoric acid become more and higher, and the phosphoric acid with high MER value is difficult to produce high-quality phosphate fertilizer and phosphorus chemical products. The phosphate concentrate pulp P produced by grinding, grading, flotation and demagging the middle-low grade phosphate ore by a reverse flotation method2O5The grade is improved, MgO is greatly reduced, and the MER value is obviously reduced, but only ordinary phosphoric acid and phosphate fertilizer products can be produced, but high-quality phosphoric acid and high-nitrogen and high-nutrient phosphate fertilizer products cannot be produced, which is caused by low grade of phosphate slurry in the acid preparation from phosphoric acid, high impurity content, high MER value and incapability of meeting the requirement on the quality of the phosphate slurry. In order to realize the upgrading of product structure and produce high-quality phosphoric acid and high-quality phosphate fertilizer products, the research of producing high-quality phosphate concentrate slurry with low MER value for producing high-quality phosphoric acid and high-quality phosphate fertilizer products is required, but an effective phosphate concentrate slurry grading utilization method is not available at present, and the prior art has certain limitations.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for grading and utilizing reverse flotation phosphate concentrate pulp, which solves the defects and shortcomings in the prior art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a process for the classification of a reverse flotation concentrate slurry, the process comprising the steps of:
s1, crushing and grinding raw ore containing high carbonate impurities, ensuring that the grinding fineness is-200 meshes and is more than 80%, fully dissociating phosphorus minerals, carbonate and other gangue minerals, and controlling the concentration of selected ore pulp to be 25-28 wt%;
s2, feeding the ore pulp into a first flotation stirring tank and a second flotation stirring tank for treatment, wherein the method comprises the following specific steps:
1) adding inhibitor regulator sulfuric acid, sodium fluosilicate sewage and slag reservoir backwater into a first stirring tank to control the pH value of ore pulp to be 4.0-4.5;
2) adding a collecting agent YP-6 into a second stirring tank, stirring and mineralizing, feeding the uniformly mineralized ore pulp into a flotation column of 4.0m multiplied by 10.0m for internal separation, taking overflow foam of the flotation column as roughing tailings, feeding the overflow foam into a flotation machine for scavenging, and feeding the underflow of the flotation column as roughing concentrate into a thickener for thickening;
s3, when the flotation column flotation rough concentrate enters the concentrate thickener, the rough concentrate slurry flows into the slurry collecting tank through the shunt part, and the rough concentrate is sent into the cyclone for classification by the slurry delivery pump, which is as follows:
1) the overflow ore pulp classified by the cyclone enters a concentrate thickener to be combined and thickened with original reverse rough concentrate and scavenging concentrate of a flotation machine for producing common phosphoric acid and phosphorus compound fertilizer;
2) the cyclone graded sand setting is used as graded concentrate and automatically flows to a sand setting collecting tank, and the graded concentrate pulp is conveyed to a high-quality concentrate thickener for thickening through a pulp pump and is used for producing high-quality phosphoric acid and high-quality phosphate fertilizer;
s4, enabling flotation column flotation foam tailings to automatically flow into 16M3In the flotation machine, charging is carried outPerforming air flotation, wherein the upper-layer foam product is tailings with high carbonate impurities, and automatically flows into a tailing thickener for thickening; the bottom flow in the tank is P-containing2O5The higher scavenged phosphate concentrate pulp directly flows into a concentrate thickener by gravity flow to be combined with the partial rough concentrate floated by the column and the classifying overflow of the swirler for thickening, and is used as phosphate concentrate pulp for producing common phosphoric acid and phosphate compound fertilizer.
Preferably, the reverse flotation adopts two parallel series, and each series uses 3 16M devices3The flotation machines are connected in series.
Preferably, the flotation column in the step 2 is a direct-flushing flotation column, the amount of the added sulfuric acid is 10Kg/t, and the amount of the sodium fluosilicate sewage is 5M3The backwater of the slag dam is 15M3And the collecting agent is 0.6 Kg/t.
Preferably, the index of classifying overflow pulp of the cyclone in the step 3 is P20528.0～28.5％，Mg0≤0.8％，R2O32.3-2.6%, MER value 0.109-0.121; the index of the cyclone graded sand setting (graded concentrate) is P20529.5～30.5％，Mg0≤0.8％，R2O32.0-2.3%, and MER value 0.092-0.105.
Preferably, the underflow in the flotation machine in the step 4 is P-containing2O5Higher scavenged phosphate concentrate pulp with index P20527.5～28.5％，Mg0≤0.8％，R2O32.4-2.7%, and MER value 0.112-0.127.
(III) advantageous effects
The invention provides a method for grading and utilizing reverse flotation phosphate concentrate pulp. The method has the following beneficial effects:
1. the invention can effectively utilize the medium-low grade phosphorite reverse flotation phosphorite concentrate to produce high-quality phosphorite concentrate pulp with better quality and lower MER value, thereby producing high-quality phosphoric acid and high-quality phosphate fertilizer products, realizing product upgrading and structure adjustment and improving the core competitiveness and the economic benefit of enterprises.
2. The invention is based on the rough concentrate obtained by the reverse flotation rough concentration of the flotation column, and the grading phosphate concentrate with higher quality and lower MER value and the overflow concentrate with slightly inferior quality and slightly higher MER value are obtained by cyclone grading again, so that the quality grading of the phosphate concentrate is realized, the differential production of acid making is realized, and the purposes of optimizing the ore, using the grading, improving the quality and reducing the cost are achieved.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the embodiment of the present invention provides a method for classification utilization of reverse flotation phosphate concentrate slurry, which comprises the following steps:
s1, crushing and grinding raw ore containing high carbonate impurities, ensuring that the grinding fineness is-200 meshes and is more than 80%, fully dissociating phosphorus minerals, carbonate and other gangue minerals, and controlling the concentration of selected ore pulp to be 25-28 wt%;
s2, feeding the ore pulp into a first flotation stirring tank and a second flotation stirring tank for treatment, wherein the method comprises the following specific steps:
1) adding inhibitor regulator sulfuric acid, sodium fluosilicate sewage and slag reservoir backwater into a first stirring tank to control the pH value of ore pulp to be 4.0-4.5;
2) adding a collecting agent YP-6 into a second stirring tank, stirring and mineralizing, feeding the uniformly mineralized ore pulp into a flotation column of 4.0m multiplied by 10.0m for internal separation, taking overflow foam of the flotation column as roughing tailings, feeding the overflow foam into a flotation machine for scavenging, and feeding the underflow of the flotation column as roughing concentrate into a thickener for thickening;
s3, when the flotation column flotation rough concentrate enters the concentrate thickener, the rough concentrate slurry flows into the slurry collecting tank through the shunt part, and the rough concentrate is sent into the cyclone for classification by the slurry delivery pump, which is as follows:
1) the overflow ore pulp classified by the cyclone enters a concentrate thickener to be combined and thickened with original reverse rough concentrate and scavenging concentrate of a flotation machine for producing common phosphoric acid and phosphorus compound fertilizer;
2) the cyclone graded sand setting is used as graded concentrate and automatically flows to a sand setting collecting tank, and the graded concentrate pulp is conveyed to a high-quality concentrate thickener for thickening through a pulp pump and is used for producing high-quality phosphoric acid and high-quality phosphate fertilizer;
s4, enabling flotation column flotation foam tailings to automatically flow into 16M3The flotation machine carries out aeration flotation, the upper layer foam product is the tailings with high carbonate impurities, and the tailings automatically flow into a tailing thickener for thickening; the bottom flow in the tank is P-containing2O5The higher scavenged phosphate concentrate pulp directly flows into a concentrate thickener by gravity flow to be combined with the partial rough concentrate floated by the column and the classifying overflow of the swirler for thickening, and is used as phosphate concentrate pulp for producing common phosphoric acid and phosphate compound fertilizer.
In the invention, the main quality indexes of raw ore, rough concentrate and graded concentrate are as follows: p2O526.0～27.5％，MgO2.0～2.5％，R2O32.2-2.5%, MER value 0.155-0.192; coarse concentrate P20528.5～29.5％，Mg0≤0.80％，R2O32.3-2.6%, MER value 0.115-0.120; fractional concentrate P20529.5～30.5％，Mg0≤0.8％，R2O32.0-2.3%, and MER value 0.092-0.105, wherein the index contents are all mass percent.
R in the invention2O3Refers to the sum of sesquioxide (sesquioxide) in phosphate ore and phosphoric acid, namely AL2O3+Fe2O3The sum of (1); the MER value in the invention refers to the content of main impurities (MgO + AL) in phosphate ore and phosphoric acid2O3+Fe2O3) Sum and P2O5The ratio of the contents.
The anti-floating selection adopts two parallel series, each series uses 3 sets of 16M3The flotation machines are connected in series; in the step 2, the flotation column is a direct-flushing flotation column, the agent is added with 10Kg/t of sulfuric acid, and the sewage of sodium fluosilicate is 5M3The backwater of the slag dam is 15M3The collecting agent is 0.6 Kg/t; in step 3Index of classifying overflow ore pulp of cyclone is P20528.0～28.5％，Mg0≤0.8％，R2O32.3-2.6%, MER value 0.109-0.121; the index of the cyclone graded sand setting (graded concentrate) is P20529.5～30.5％，Mg0≤0.8％，R2O32.0-2.3%, MER value 0.092-0.105; the underflow in the flotation machine in the step 4 contains P2O5Higher scavenged phosphate concentrate pulp with index P20527.5～28.5％，Mg0≤0.8％，R2O32.4-2.7%, and MER value 0.112-0.127.
The first embodiment is as follows:
in the embodiment, the production period is 11-26 days in a month, and the average quality of the raw material ore of the phosphate ore which is input for production is as follows: p20526.43% of MgO 2.21% of R2O3The content is 2.73 percent, and the MER value is 0.187; the average quality of the column flotation rough concentrate is as follows: p20528.48% of MgO, 0.76% of R2O3The content is 2.65 percent, and the MER value is 0.120; the average quality of the graded phosphate concentrate after the coarse concentrate is subjected to cyclone grading again by adopting the method is as follows: p20528.99% of Mg0, 0.78% of R2O3The content was 2.41% and the MER value was 0.110. The average quality of phosphoric acid used for wet process phosphoric acid production is: p20546.35% of Mg0 1.65% of R2O3The content is 2.80 percent, and the MER value is 0.096; the average nitrogen content of the produced diammonium phosphate (DAP) product is 17.52 percent, and P205The content is 46.96 percent, the total nutrient is 64.48 percent, and the product reaches the superior standard of domestic diammonium phosphate (DAP) nitrogen content of 17.5 percent and total nutrient of 64 percent. The following table 1 is a quality comparison table in this example;
TABLE 1
Example two:
in the embodiment, the production period is 3-12 days in a month, and the average quality of the raw material ore of the phosphate ore which is input for production is as follows: p20526.88% of MgO, 2.12% of R2O3The content is 2.48 percent, and the MER value is 0.171; the average quality of the column flotation rough concentrate is as follows: p20528.93 percent of Mg0, 0.72 percent of R2O3The content is 2.31 percent, and the MER value is 0.105; the average quality of the graded phosphate concentrate after the coarse concentrate is subjected to cyclone grading again by adopting the method is as follows: p20529.53% of Mg0, 0.75% of R2O3The content was 2.12%, and the MER value was 0.097. The average quality of phosphoric acid used for wet process phosphoric acid production is: p20547.33% of Mg0, 1.57% of R2O3The content is 2.58 percent, and the MER value is 0.088; the average nitrogen content of the produced diammonium phosphate (DAP) product is 18.02 percent, P205The content is 46.44 percent, the total nutrient is 64.46 percent, and the export standard of 18 percent of international diammonium phosphate (DAP) nitrogen content and 64 percent of total nutrient is reached. The following table 2 is a quality comparison table in this example;
TABLE 2
Example three:
in the embodiment, the production period is 6-10 days in a month, and the average quality of the raw material ore of the phosphate ore which is input for production is as follows: p20527.45% of MgO, 2.08% of R2O3The content is 2.32 percent, and the MER value is 0.160; the average quality of the column flotation rough concentrate is as follows: p20529.55% of Mg0, 0.66% of R2O3The content is 2.18 percent, and the MER value is 0.096; the average quality of the graded phosphate concentrate after the coarse concentrate is subjected to cyclone grading again by adopting the method is as follows: p20530.41 percent of Mg0, 0.70 percent of R2O3The content is 2.04 percent, the MER value is 0.090, and the index of phosphoric acid produced by wet-process phosphoric acid is P20550.03 percent of Mg0, 1.52 percent of R2O32.65% in MER value 0.083, and a 66% monoammonium phosphate (MAP) average nitrogen content of 11.06%, P205The content is 55.48%, the total nutrient is 66.54%, and the produced 66% nutrient monoammonium phosphate (MAP) reaches the standard of export high-quality high-efficiency monoammonium phosphate. The following table 3 is a quality comparison table in this example;
TABLE 3
The invention mainly carries out cyclone classification again on the rough concentrate produced by reverse flotation, and separates the classified concentrate with better index and quality and the overflow concentrate with slightly inferior quality. The method is characterized in that: the invention utilizes the principle that the cyclone separates according to the size fraction and the specific gravity and aims at the P content of the fine fraction in the phosphate concentrate pulp2O5Low, containing R2O3High performance, coarse fraction containing P obtained by cyclone classification2O5High, R2O3Low sand (fine phosphate concentrate) and fine fraction containing P2O5Slightly lower, R2O3The higher quality of the slightly-inferior overflow concentrate realizes the quality grading and the respective processing and utilization of the reverse-flotation magnesium-removing phosphate concentrate, and realizes the quality differentiation production of the phosphoric acid.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for utilizing reverse flotation concentrate pulp in a grading way is characterized by comprising the following steps: the method comprises the following steps:
s1, crushing and grinding raw ore containing high carbonate impurities, ensuring that the grinding fineness is-200 meshes and is more than 80%, fully dissociating phosphorus minerals, carbonate and other gangue minerals, and controlling the concentration of selected ore pulp to be 25-28 wt%;
s2, feeding the ore pulp into a first flotation stirring tank and a second flotation stirring tank for treatment, wherein the method comprises the following specific steps:
1) adding inhibitor regulator sulfuric acid, sodium fluosilicate sewage and slag reservoir backwater into a first stirring tank to control the pH value of ore pulp to be 4.0-4.5;
2) adding a collecting agent YP-6 into a second stirring tank, stirring and mineralizing, feeding the uniformly mineralized ore pulp into a flotation column of 4.0m multiplied by 10.0m for internal separation, taking overflow foam of the flotation column as roughing tailings, feeding the overflow foam into a flotation machine for scavenging, and feeding the underflow of the flotation column as roughing concentrate into a thickener for thickening;
s3, when the flotation column flotation rough concentrate enters the concentrate thickener, the rough concentrate slurry flows into the slurry collecting tank through the shunt part, and the rough concentrate is sent into the cyclone for classification by the slurry delivery pump, which is as follows:
1) the overflow ore pulp classified by the cyclone enters a concentrate thickener to be combined and thickened with original reverse rough concentrate and scavenging concentrate of a flotation machine for producing common phosphoric acid and phosphorus compound fertilizer;
2) the cyclone graded sand setting is used as graded concentrate and automatically flows to a sand setting collecting tank, and the graded concentrate pulp is conveyed to a high-quality concentrate thickener for thickening through a pulp pump and is used for producing high-quality phosphoric acid and high-quality phosphate fertilizer;
s4, enabling flotation column flotation foam tailings to automatically flow into 16M3The flotation machine carries out aeration flotation, the upper layer foam product is the tailings with high carbonate impurities, and the tailings automatically flow into a tailing thickener for thickening; the bottom flow in the tank is P-containing2O5The higher scavenged phosphate concentrate pulp directly flows into a concentrate thickener by gravity flow to be combined with the partial rough concentrate floated by the column and the classifying overflow of the swirler for thickening, and is used as phosphate concentrate pulp for producing common phosphoric acid and phosphate compound fertilizer.
2. The process according to claim 1, wherein the reverse flotation concentrate slurry is classified and utilized by: the reverse flotation separation adopts two parallel series, and each series uses 3 16M3The flotation machines are connected in series.
3. The process according to claim 1, wherein the reverse flotation concentrate slurry is classified and utilized by: the flotation column in the step 2 is a direct-flushing flotation column, the agent adding sulfuric acid is 10Kg/t, and the sewage of sodium fluosilicate is 5M3The backwater of the slag dam is 15M3And the collecting agent is 0.6 Kg/t.
4. The process according to claim 1, wherein the reverse flotation concentrate slurry is classified and utilized by: the index of classifying overflow ore pulp of the cyclone in the step 3 is P20528.0～28.5％，Mg0≤0.8％，R2O32.3-2.6%, MER value 0.109-0.121; the index of the cyclone graded sand setting (graded concentrate) is P20529.5～30.5％，Mg0≤0.8％，R2O32.0-2.3%, and MER value 0.092-0.105.
5. The process according to claim 1, wherein the reverse flotation concentrate slurry is classified and utilized by: the bottom flow in the flotation machine in the step 4 contains P2O5Higher scavenged phosphate concentrate pulp with index P20527.5～28.5％，Mg0≤0.8％，R2O32.4-2.7%, and MER value 0.112-0.127.
Priority Applications (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112191361A (en) * | 2020-09-27 | 2021-01-08 | 湖北祥云(集团)化工股份有限公司 | Method and production system for preparing powdered ammonium and high-quality ammonium phosphate by phosphorite classification |
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| CN102886306A (en) * | 2012-07-18 | 2013-01-23 | 云南磷化集团有限公司 | Column-slot combined technology for grading calcium collophanite |
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| CN109158205A (en) * | 2018-08-30 | 2019-01-08 | 云南磷化集团有限公司 | A kind of physical fractionation combines the production method of promotion high-quality phosphorus concentrate with chemical treatment |
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| CN102179308A (en) * | 2010-12-17 | 2011-09-14 | 云南磷化集团有限公司 | Oredressing method for removing sesquioxide of iron and aluminum |
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| CN112191361A (en) * | 2020-09-27 | 2021-01-08 | 湖北祥云(集团)化工股份有限公司 | Method and production system for preparing powdered ammonium and high-quality ammonium phosphate by phosphorite classification |
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