CN118239809A - Method for directly producing compound fertilizer by using medium-low grade phosphorite - Google Patents
Method for directly producing compound fertilizer by using medium-low grade phosphorite Download PDFInfo
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- CN118239809A CN118239809A CN202410350272.8A CN202410350272A CN118239809A CN 118239809 A CN118239809 A CN 118239809A CN 202410350272 A CN202410350272 A CN 202410350272A CN 118239809 A CN118239809 A CN 118239809A
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- 239000002367 phosphate rock Substances 0.000 title claims abstract description 52
- 239000003337 fertilizer Substances 0.000 title claims abstract description 46
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- 150000001875 compounds Chemical class 0.000 title claims abstract description 25
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000002253 acid Substances 0.000 claims abstract description 43
- 239000011259 mixed solution Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 22
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004202 carbamide Substances 0.000 claims abstract description 20
- 239000011268 mixed slurry Substances 0.000 claims abstract description 17
- 239000011574 phosphorus Substances 0.000 claims abstract description 16
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 238000001035 drying Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000012216 screening Methods 0.000 claims abstract description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 20
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 17
- 230000000704 physical effect Effects 0.000 claims description 17
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 13
- 239000011591 potassium Substances 0.000 claims description 13
- 229910052700 potassium Inorganic materials 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical group [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 229940072033 potash Drugs 0.000 claims description 6
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 235000015320 potassium carbonate Nutrition 0.000 claims description 6
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 5
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 5
- 239000001099 ammonium carbonate Substances 0.000 claims description 5
- KMQAPZBMEMMKSS-UHFFFAOYSA-K calcium;magnesium;phosphate Chemical compound [Mg+2].[Ca+2].[O-]P([O-])([O-])=O KMQAPZBMEMMKSS-UHFFFAOYSA-K 0.000 claims description 5
- 239000010459 dolomite Substances 0.000 claims description 5
- 229910000514 dolomite Inorganic materials 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 239000004021 humic acid Substances 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 2
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 2
- 235000011151 potassium sulphates Nutrition 0.000 claims description 2
- 239000010433 feldspar Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011575 calcium Substances 0.000 abstract description 9
- 229910052791 calcium Inorganic materials 0.000 abstract description 9
- 239000011777 magnesium Substances 0.000 abstract description 9
- 229910052749 magnesium Inorganic materials 0.000 abstract description 9
- 229910052710 silicon Inorganic materials 0.000 abstract description 5
- 239000010703 silicon Substances 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 239000008187 granular material Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 8
- 239000011593 sulfur Substances 0.000 description 8
- 229910052717 sulfur Inorganic materials 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- DLHONNLASJQAHX-UHFFFAOYSA-N aluminum;potassium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Si+4].[Si+4].[Si+4].[K+] DLHONNLASJQAHX-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000005696 Diammonium phosphate Substances 0.000 description 3
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 3
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 3
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 3
- 235000019838 diammonium phosphate Nutrition 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 235000019837 monoammonium phosphate Nutrition 0.000 description 3
- 239000006012 monoammonium phosphate Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000002426 superphosphate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- XQTIWHSAQUFHIT-UHFFFAOYSA-L calcium;urea;sulfate Chemical compound [Ca+2].NC(N)=O.[O-]S([O-])(=O)=O XQTIWHSAQUFHIT-UHFFFAOYSA-L 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000000749 insecticidal effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- -1 phosphorus compound Chemical class 0.000 description 1
- 230000008979 phosphorus utilization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- Fertilizers (AREA)
Abstract
The invention discloses a method for directly producing compound fertilizer by using medium-low grade phosphorite, and relates to the technical field of fertilizer production. Comprises the following steps: uniformly mixing the mixed acid, sulfuric acid and water, and controlling the temperature to be 65-80 ℃; adding urea to react at 75-95 ℃ to obtain a mixed solution; adding the mixed solution into the phosphorus ore pulp, and reacting for 90-250min under the conditions of 70-90 ℃ and 50-100m/min of stirring strength to obtain mixed slurry; and adding the mixed slurry into a granulator, spraying slurry, granulating, drying and screening to obtain the multifunctional multi-nutrition compound fertilizer. Mixing the mixed acid and sulfuric acid, adding urea, and directly converting all elements such as phosphorus, calcium, magnesium, silicon and the like in the medium and low grades into a form which can be absorbed by crops, so as to directly granulate, thereby realizing the direct utilization of the medium and low grade phosphorite, and fully and efficiently utilizing phosphorite resources.
Description
Technical Field
The invention relates to the technical field of fertilizer production, in particular to a method for directly producing compound fertilizer by using medium-low grade phosphorite.
Background
The low-grade phosphate rock, especially the low-grade high-silicon phosphate rock, can be used for the production of wet-process phosphoric acid after the phosphorus is enriched by floatation due to the low phosphorus grade, and can be used after desilication treatment due to the high silicon content, and main products in the production process of the wet-process phosphoric acid are phosphoric acid, superphosphate, monoammonium phosphate and diammonium phosphate, which can be directly used for the preparation of compound fertilizer. However, in the initial stage of the decomposition process, the sulfuric acid and the phosphorite react vigorously, and the produced calcium sulfate crystals form a compact coating layer on the surface of phosphorite particles to prevent the sulfuric acid from further reaction with the phosphorite, so that the initial conversion rate of decomposing the phosphorite by the sulfuric acid method is low; in addition, in the process of producing phosphoric acid, monoammonium phosphate and diammonium phosphate, sulfuric acid reacts with phosphorite to produce a large amount of phosphogypsum, the phosphoric acid is obtained through operations such as concentration, filtration and the like, and then the phosphoric acid reacts with ammonia to obtain monoammonium phosphate or diammonium phosphate; in addition, the traditional production of the superphosphate has the defects of long curing period, unorganized exhaust gas emission, easy caking of products and the like.
However, the wet-process phosphoric acid has strict requirements on the grade of the decomposed phosphate rock, and the medium-low grade high-silicon phosphate rock cannot be directly used for the production of the wet-process phosphoric acid, and cannot be directly used for the production of the phosphorus compound fertilizer. In the prior art, the glass fertilizer is produced by directly melting the medium-low grade phosphorite by a thermal method, which is a way for directly preparing the compound fertilizer, but the method has high energy consumption, so that the production cost of the product is high, the method cannot adapt to the existing compound fertilizer market, and the popularization is difficult.
Therefore, a new process for preparing the compound fertilizer by simply decomposing the medium-low grade phosphorite is needed.
Disclosure of Invention
The invention provides a method for directly producing compound fertilizer by using medium-low grade phosphate rock, which aims to solve the problems that the existing medium-low grade phosphate rock cannot be directly used for producing compound fertilizer or the cost of directly producing compound fertilizer is high and the energy consumption is large.
The technical scheme of the invention is as follows: a method for directly producing compound fertilizer by using medium-low grade phosphorite is characterized by comprising the following steps:
S1, uniformly mixing the mixed acid with sulfuric acid and water, controlling the temperature at 65-80 ℃ and the mixing time at 5-10min, and obtaining new mixed acid with stirring intensity of 200-400 r/min;
S2, adding urea to react at 75-95 ℃ and 300-500r/min until the urea is completely dissolved and reacts to obtain a mixed solution;
s3, adding the mixed solution into the phosphorus ore pulp, and reacting for 90-250min under the conditions of 70-90 ℃ and stirring intensity of 300-500r/min to obtain mixed slurry;
S4, adding the mixed slurry into a granulator, performing guniting granulation at the temperature of 40-80 ℃, and drying and screening to obtain the multifunctional multi-nutrition compound fertilizer.
Further technical scheme is that potash fertilizer and physical property regulator are also added into the granulator in the step S4, wherein the physical property regulator is one or more of yellow phosphorus slag, liquid ammonia, calcium magnesium phosphate fertilizer, ground phosphate rock, humic acid, limestone, dolomite, potassium feldspar, weathered coal or ammonium bicarbonate, and the particle size of the potash fertilizer and the physical property regulator is-200 meshes more than 50%.
The further technical proposal is that the potash fertilizer is potassium chloride or potassium sulfate, and the addition amount of the physical property regulator is 5-20% of the mass of the mixed slurry.
The further technical proposal is that the mixed acid is a mixture of slag acid and raffinate acid, the concentration of phosphoric acid is 20-50%, the concentration of sulfuric acid is 93-98%, and the mole ratio of phosphoric acid to sulfuric acid in the novel mixed acid is 1-4:1.
The further technical scheme is that in the step S2, the molar ratio of the urea addition amount to sulfuric acid in the mixed solution is 1-4:1.
The further technical proposal is that in the step S3, the particle size-200 mesh content of phosphorite slurry phosphorite is 50-80%, the solid content of ore slurry is 30-70%, and the mass ratio of the mixed solution to phosphorite slurry is 1-3:1, a step of; the phosphorite is middle-low grade phosphorite with the P 2O5 content of 10-25 percent by weight.
The further technical proposal is that the drying temperature in the step S4 is 60-90 ℃, the drying time is 0.5-3h, and the grain diameter of the obtained multifunctional multi-nutrition compound fertilizer is 1.0-4.75mm.
Compared with the prior art, the invention has the beneficial effects that:
In the invention, the influence of a passivation film is overcome, the reaction efficiency is higher, and the phosphorus utilization efficiency is better; the calcium element in the phosphorite is decomposed and reacts with urea to generate complex salts such as urea calcium sulfate and the like, which can be absorbed and utilized by crops, thereby realizing the effective utilization of calcium ions in the phosphorite; fluorine and silicon in phosphorite can generate fluosilicic acid urea, the problems of unorganized emission of fluorine and the like are avoided, and the fluosilicic acid urea also has insecticidal effect; the process can utilize wet phosphoric acid byproduct, namely slag acid and raffinate acid, so that the utilization paths of the slag acid and the raffinate acid are widened; the process can be carried out continuously in the production processes of preparing mixed liquor, acidolysis phosphorite, spray granulation, drying and screening, and the like, and slurry obtained by reaction does not have stockpiling and curing, and can be directly and completely used as a raw material for producing the compound fertilizer.
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 following examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
A method for directly producing compound fertilizer by using medium-low grade phosphorite comprises the following steps:
S1, uniformly mixing mixed acid, sulfuric acid and water, controlling the temperature at 65 ℃ and the mixing time at 5min, and stirring the mixed acid with the stirring intensity of 400r/min to obtain new mixed acid; the mixed acid is a mixture of slag acid and raffinate acid, and the concentration of phosphoric acid is 44%; the sulfuric acid concentration is 98%, and the molar ratio of the new mixed acid to sulfuric acid calculated by phosphoric acid is 2:1, a step of;
S2, adding urea to react at 75 ℃ under the condition of stirring intensity of 400r/min until the urea is completely dissolved, so as to obtain a mixed solution; the molar ratio of the urea addition to the sulfuric acid in the mixed solution is 3.6:1, a step of;
S3, adding the mixed solution into the phosphorus ore pulp, and reacting for 180 minutes at the temperature of 85 ℃ and the stirring intensity of 400r/min to obtain mixed slurry; the content of the phosphorite particles with the granularity of-200 meshes in the phosphorite slurry is 50-80%, the solid content of the ore slurry is 70%, and the mass ratio of the mixed solution to the phosphorite slurry is 1.6:1, a step of; the content of P 2O5 in phosphorite is 23% by weight.
S4, adding crushed materials of potassium fertilizer and physical property regulator into a granulator, wherein the physical property regulator is a mixture of yellow phosphorus slag, ammonia, calcium magnesium phosphate fertilizer, humic acid, limestone, dolomite, potassium feldspar and ammonium bicarbonate, and the particle size is-200 meshes more than 50%; the potassium fertilizer is potassium chloride, the particle size is-200 meshes more than 50%, and the addition amount is 28% of the slurry; the addition amount of the physical property regulator is 15% of the mass of the mixed slurry; adding the mixed slurry into a granulator, spraying and granulating at 65 ℃, drying at 90 ℃ for 2.5 hours, and screening to obtain the multifunctional multi-nutrition compound fertilizer (15-10-15 of nitrogen, phosphorus, potassium, calcium, magnesium, 1% of sulfur, 1%) containing nitrogen, phosphorus, potassium, calcium, magnesium and sulfur, wherein the average particle strength is 44.24N, and the particle size is 1.0-4.75mm.
Example 2
A method for directly producing compound fertilizer by using medium-low grade phosphorite comprises the following steps:
S1, uniformly mixing mixed acid, sulfuric acid and water, controlling the temperature at 75 ℃, mixing for 5min, and stirring the mixed acid for 400r/min to obtain new mixed acid; the mixed acid is a mixture of slag acid and raffinate acid, the sulfuric acid concentration is 98%, and the molar ratio of the mixed acid to sulfuric acid calculated by phosphoric acid in the novel mixed acid is 2:1, a step of;
S2, adding urea to react at 85 ℃ under the condition of stirring intensity of 400r/min until the urea is completely dissolved, so as to obtain a mixed solution; the molar ratio of the urea addition to the sulfuric acid in the mixed solution is 3.6:1, a step of;
s3, adding the mixed solution into the phosphorus ore pulp, and reacting for 180 minutes at the temperature of 85 ℃ and the stirring intensity of 400r/min to obtain mixed slurry; the content of the phosphorite particles with the granularity of-200 meshes in the phosphorite slurry is 50-80%, the solid content of the ore slurry is 70%, and the mass ratio of the mixed solution to the phosphorite slurry is 1.5:1, a step of; the content of P 2O5 in phosphorite is 20% by weight.
S4, adding crushed materials of potassium fertilizer and physical property regulator into a granulator, wherein the physical property regulator is a mixture of yellow phosphorus slag, ammonia, calcium magnesium phosphate fertilizer, humic acid, limestone, dolomite, potassium feldspar and ammonium bicarbonate, and the particle size is-200 meshes more than 50%; the potassium fertilizer is potassium chloride, the particle size is-200 meshes more than 50%, and the addition amount is 25% of the slurry; the addition amount of the physical property regulator is 20% of the mass of the mixed slurry; adding the mixed slurry into a granulator, and performing slurry spraying granulation at the temperature of 65 ℃; at 90 ℃, the drying time is 2.5h, and the multifunctional multi-nutrition compound fertilizer (15-10-15 of nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, 7% of calcium, 1% of magnesium, and 1% of sulfur) containing nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur is obtained after sieving, the average particle strength is 43.56N, and the particle size is 1.0-4.75mm.
Example 3
A method for directly producing compound fertilizer by using medium-low grade phosphorite comprises the following steps:
S1, uniformly mixing mixed acid, sulfuric acid and water, controlling the temperature at 80 ℃ and the mixing time at 5min, and stirring the mixed acid with the stirring intensity of 400r/min to obtain new mixed acid; the mixed acid is a mixture of slag acid and raffinate acid, the sulfuric acid concentration is 98%, and the molar ratio of the mixed acid to sulfuric acid calculated by phosphoric acid in the novel mixed acid is 2:1, a step of;
S2, adding urea to react at 85 ℃ under the condition of stirring intensity of 400r/min until the urea is completely dissolved, so as to obtain a mixed solution; the molar ratio of the urea addition to the sulfuric acid in the mixed solution is 3.6:1, a step of;
S3, adding the mixed solution into the phosphorus ore pulp, and reacting for 210 minutes under the conditions that the temperature is 80 ℃ and the stirring intensity is 400r/min to obtain mixed slurry; the content of the phosphorite particles with the granularity of-200 meshes in the phosphorite slurry is 50-80%, the solid content of the ore slurry is 70%, and the mass ratio of the mixed solution to the phosphorite slurry is 1.6:1, a step of; the content of P 2O5 in phosphorite is 19% by weight.
S4, adding crushed materials of potassium fertilizer and physical property regulator into a granulator, wherein the physical property regulator is a mixture of yellow phosphorus slag, ammonia, calcium magnesium phosphate fertilizer, humic acid, limestone, dolomite, potassium feldspar and ammonium bicarbonate, and the particle size is-200 meshes more than 50%; the potassium fertilizer is potassium chloride, the particle size is-200 meshes more than 50%, and the addition amount is 26% of the slurry; the addition amount of the physical property regulator is 18% of the mass of the mixed slurry; adding the mixed slurry into a granulator, and performing slurry spraying granulation at the temperature of 65 ℃; at 90 ℃, the drying time is 2.5h, and the multifunctional multi-nutrition compound fertilizer (15-10-15 of nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur, 7% of calcium, 1% of magnesium, and 1% of sulfur) containing nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur is obtained after sieving, the average particle strength is 45.43N, and the particle size is 1.0-4.75mm.
The foregoing has shown and described the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A method for directly producing compound fertilizer by using medium-low grade phosphorite is characterized by comprising the following steps:
S1, uniformly mixing the mixed acid with sulfuric acid and water, controlling the temperature at 65-80 ℃ and the mixing time at 5-10min, and obtaining new mixed acid with stirring intensity of 200-400 r/min;
S2, adding urea to react at 75-95 ℃ and 300-500r/min until the urea is completely dissolved and reacts to obtain a mixed solution;
s3, adding the mixed solution into the phosphorus ore pulp, and reacting for 90-250min under the conditions of 70-90 ℃ and stirring intensity of 300-500r/min to obtain mixed slurry;
S4, adding the mixed slurry into a granulator, performing guniting granulation at the temperature of 40-80 ℃, and drying and screening to obtain the multifunctional multi-nutrition compound fertilizer.
2. The method according to claim 1, characterized in that: the step S4 granulator is also added with potash fertilizer and physical property regulator, wherein the physical property regulator is one or more of yellow phosphorus slag, liquid ammonia, calcium magnesium phosphate fertilizer, phosphate rock powder, humic acid, limestone, dolomite, potash feldspar, weathered coal or ammonium bicarbonate, and the particle size of the potash fertilizer and the physical property regulator is-200 meshes more than 50%.
3. The method according to claim 2, characterized in that: the potassium fertilizer is potassium chloride or potassium sulfate, and the addition amount of the physical property regulator is 5-20% of the mass of the mixed slurry.
4. The method according to claim 1, characterized in that: the mixed acid is a mixture of slag acid and raffinate acid, the concentration of phosphoric acid is 20-50%, the concentration of sulfuric acid is 93-98%, and the molar ratio of phosphoric acid to sulfuric acid in the novel mixed acid is 1-4:1.
5. The method according to claim 1, characterized in that: in the step S2, the molar ratio of the urea addition amount to sulfuric acid in the mixed solution is 1-4:1.
6. The method according to claim 1, characterized in that: in the step S3, the particle size-200 mesh content of phosphorite slurry phosphorite is 50-80%, the solid content of ore slurry is 30-70%, and the mass ratio of the mixed solution to phosphorite slurry is 1-3:1, a step of; the phosphorite is middle-low grade phosphorite with the P 2O5 content of 10-25 percent by weight.
7. The method according to claim 1, characterized in that: the drying temperature in the step S4 is 60-90 ℃, the drying time is 0.5-3h, and the grain diameter of the obtained multifunctional multi-nutrition compound fertilizer is 1.0-4.75mm.
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