CN114516773A - Method for granulating powdered rock phosphate - Google Patents
Method for granulating powdered rock phosphate Download PDFInfo
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- CN114516773A CN114516773A CN202210194307.4A CN202210194307A CN114516773A CN 114516773 A CN114516773 A CN 114516773A CN 202210194307 A CN202210194307 A CN 202210194307A CN 114516773 A CN114516773 A CN 114516773A
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- China
- Prior art keywords
- phosphate
- magnesium oxide
- parts
- granulating
- powdered rock
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- 239000002367 phosphate rock Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003337 fertilizer Substances 0.000 claims abstract description 19
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 18
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 18
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 18
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000000440 bentonite Substances 0.000 claims abstract description 11
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 11
- KMQAPZBMEMMKSS-UHFFFAOYSA-K calcium;magnesium;phosphate Chemical compound [Mg+2].[Ca+2].[O-]P([O-])([O-])=O KMQAPZBMEMMKSS-UHFFFAOYSA-K 0.000 claims abstract description 10
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 9
- 239000010452 phosphate Substances 0.000 claims abstract description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 10
- 239000008187 granular material Substances 0.000 claims description 6
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 5
- 235000019796 monopotassium phosphate Nutrition 0.000 claims description 5
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 5
- LWIHDJKSTIGBAC-UHFFFAOYSA-K potassium phosphate Substances [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 claims description 5
- 239000004254 Ammonium phosphate Substances 0.000 claims description 3
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 3
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 3
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 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 description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 230000001788 irregular Effects 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 238000001035 drying Methods 0.000 abstract description 7
- 239000000843 powder Substances 0.000 description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 10
- 239000011230 binding agent Substances 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 8
- 239000011574 phosphorus Substances 0.000 description 8
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 229940092782 bentonite Drugs 0.000 description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000002253 acid Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical class O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000498 ball milling Methods 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910000280 sodium bentonite Inorganic materials 0.000 description 2
- 229940080314 sodium bentonite Drugs 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000011592 zinc chloride Substances 0.000 description 2
- 235000005074 zinc chloride Nutrition 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000281 calcium bentonite Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 1
- 229910000396 dipotassium phosphate Inorganic materials 0.000 description 1
- 235000019797 dipotassium phosphate Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003979 granulating agent Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000155 melt Substances 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
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/14—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating dishes or pans
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/20—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by expressing the material, e.g. through sieves and fragmenting the extruded length
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a method for granulating powdered rock phosphate, which comprises the following steps: the bentonite, the phosphate, the powdered phosphorite, the diatomite and the magnesium oxide are crushed to a certain fineness in a ball mill and fully mixed to prepare particles with a certain size, and the particles can reach a certain strength without further drying, so that the production requirements of fertilizers such as calcium magnesium phosphate fertilizers, silicon fertilizers and the like are met.
Description
Technical Field
The invention relates to the technical field of fertilizer manufacturing, in particular to a method for granulating powdered rock phosphate.
Background
The Ca-Mg-P fertilizer is prepared through melting phosphorus ore with Si-and Mg-contained minerals at high temp, quenching the melt with water to obtain a glassy material, drying and grinding. The calcium magnesium phosphate fertilizer mainly comprises three production processes of a blast furnace method, an electric furnace method and a flat furnace, wherein the raw materials fed into the furnace by the electric furnace method and the blast furnace method have certain granularity, and for powdery phosphate rock, tailings or other raw materials, a proper granulating agent or granulating technology needs to be found so as to meet the requirement of producing the calcium magnesium phosphate fertilizer by the electric furnace method and the blast furnace method.
The patent CN104261363B A powdered rock phosphate granulating, forming and roasting method, powdered rock phosphate pretreated by crushing, screening, drying and homogenizing of the powdered rock phosphate is sent to a ball mill for grinding, and then sent to a disc granulator, and added with a binder made of acid sludge which is an intermediate product of wet-process phosphoric acid production by a dihydrate method, so that the powdered rock phosphate is mutually bonded to prepare the powdered rock phosphate with the granularity of 20-30 mm, and the tail gas of a phosphorus furnace is introduced into a grate type roasting machine for roasting at 850-950 ℃, and then cooled by air cooling, thus preparing the powdered rock phosphate pellet for yellow phosphorus production. This patent is broken with the phosphorite, sieves, dries, still will get into the ball-milling, and disc granulation again, complex operation, stoving and calcination energy consumption are high.
Patent CN108249411B A preparation method of ground or crushed phosphorite binder and a production method of molded ore, wherein industrial by-product mainly containing silicon oxide is used as raw material, caustic soda and catalyst are added to prepare ground or crushed phosphorite binder; the binder and the ground phosphate rock or the crushed phosphate rock are pelletized and calcined to obtain the raw material for producing yellow phosphorus by an electric furnace method, namely the molded ore. Caustic soda, a strong alkaline chemical, is required.
The patent CN96103837.3 discloses a method for bonding broken phosphate rock into lumps, which is to add phosphoric acid as a binder into broken phosphate rock with the granularity less than 8mm, uniformly stir the mixture, wherein the adding amount of the phosphoric acid is calculated by phosphorus pentoxide, 0.5-2 parts of phosphorus pentoxide are added into every 100 parts of the broken phosphate rock, then the mixture is pressed and formed by a forming machine to prepare green pellets, and the green pellets are dried at the temperature of 200-800 ℃ until the moisture content is less than or equal to 1% or naturally air-dried. The above method requires drying or air drying.
The invention discloses a method for forming broken phosphorite, and relates to a method for forming and curing broken phosphorite, belonging to the technical field of comprehensive utilization of mineral resources. Adding 2-4% of activated kaolin, 4-5% of water glass and 10-12% of process water into the crushed phosphorite by mass of a dry crushed phosphorite base, stirring, mixing and homogenizing the mixture, and standing and maintaining the mixture after forming to obtain a finished product. However, the activated kaolin needs to be activated for 40-60 min at the temperature of 600-700 ℃, and the energy consumption for preparing the activated kaolin is high, so that the problem of dust is involved.
The patent CN105271147B thermal process phosphorus mud type phosphorus ore powder binder is characterized in that phosphorus-containing wastewater generated in the production process of thermal process yellow phosphorus is added into an acid mud stirring tank, 25-30 percent of free phosphoric acid generated by filtering the phosphoric acid prepared from thermal process phosphorus mud is slowly added into pasty acid mud with the percentage content of 30-35 percent of P2O5, and the mixture is uniformly stirred and mixed into suspension to prepare the phosphorus ore powder binder with the solid content of 70-80 percent and the percentage content of P2O5 of 28-32 percent. The binder is mixed with the powdered rock phosphate in proportion and then used for the powdered rock phosphate pellet pressing, forming, drying or pelleting and roasting process to produce the powdered rock phosphate pellets. The process is complex to operate, and pasty acid mud needs to be prepared firstly, and then suspension is prepared.
CN102381690B discloses a phosphate rock powder oxygen-enriched binder, which is prepared by mixing montmorillonite powder and a medicament prepared from rare earth elements, sodium chloride, calcium chloride, zinc chloride, sodium carbonate and potassium carbonate in a ratio of 1: 2.80-3.60, curing, drying and ball-milling the mixture into powder to obtain a finished product; the medicament is a liquid substance with the concentration of 20-45%, and is prepared by mixing and dissolving 3-5% of rare earth elements, 5-10% of sodium chloride, 5-10% of calcium chloride, 5-10% of zinc chloride, 5-10% of sodium carbonate and 2-11% of potassium carbonate in sufficient water. The method is suitable for bonding single element ore powder or multi-element ore powder such as ground phosphate rock, serpentine powder, iron ore powder, manganese ore powder and the like, is beneficial to pelletizing and granulating, improves the air permeability of a material layer, accelerates the heat transfer speed and improves the sintering speed.
In conclusion, various types of binders and preparation-type ore methods are developed around the forming technology of broken phosphate rock or phosphate rock powder, and have various characteristics and advantages, but bentonite, phosphate, powdery phosphate rock, diatomite and magnesium oxide are mixed and granulated, and the obtained spheres do not need to be dried, and no report is provided.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides the powdered phosphate rock pelletizing method for producing the calcium-magnesium phosphate fertilizer.
The invention is realized by the following technical scheme:
a method for granulating powdered rock phosphate is characterized by comprising the following steps: 1-20 parts of bentonite, 5-20 parts of phosphate, 20-88 parts of powdered phosphorite, 1-20 parts of diatomite and 5-20 parts of magnesium oxide are ground in a ball mill to a certain fineness and are fully mixed, then the mixture is granulated in a disc, a roller or an extruder, water is continuously sprayed until the granules reach a certain size, the mixture is placed in the air for 3-120 hours, and after the strength reaches 100-300N, the granules are screened, so that the granules meeting the requirements of production of calcium magnesium phosphate fertilizers or silicon fertilizers are obtained.
The bentonite is calcium-based or sodium-based bentonite, and the water content is 1-20%.
The phosphate is one or a mixture of more than two of ammonium phosphate, monopotassium phosphate and monopotassium phosphate.
The diatomite is white, grey or light grey brown diatomite, and the content of silicon dioxide is not less than 50%.
The magnesium oxide is dead burned magnesium oxide or/and light burned magnesium oxide, and the content of the magnesium oxide is not less than 60%.
And the bentonite, the phosphate, the powdered phosphorite, the diatomite and the magnesium oxide are crushed in a ball mill to be 50-400 meshes in fineness and then discharged.
The particle size is 10-50 mm round particles or irregular blocks.
The invention has the advantages that:
1. phosphate and magnesium oxide are added into the phosphorite powder to form a self-hardening system, and after water is added for granulation, hardening reaction occurs inside particles to obtain particles with high strength and high temperature resistance;
2. the addition of bentonite and diatomaceous earth forms the void structure in spheroid inside, has further promoted the intensity of granule, at the calcination in-process of phosphorus ore, is favorable to the air admission, promotes calcination efficiency. The phosphorite particles prepared by the method can achieve high strength without further drying, and meet the production requirements of fertilizers such as calcium magnesium phosphate fertilizer, silicon fertilizer and the like.
Detailed description of the invention
The invention is further described in connection with the examples, which are obtained as raw materials for the examples. The examples are in parts by weight.
Example 1
A method for granulating powdered rock phosphate comprises the following steps: 20 parts of calcium bentonite with the water content of 1 percent, 20 parts of ammonium phosphate, 20 parts of powdered phosphorite, 20 parts of off-white diatomite and 20 parts of dead burned magnesium oxide are crushed to 400 meshes in a ball mill, fully mixed, continuously sprayed with water in a disc granulator, granulated in a rolling way, and discharged through the outlet of the granulator when the particle size of spheres reaches 50 mm. The obtained spheres are placed in the air for 120 hours, the strength can reach 300N, and the spheres with the size required by the production of the calcium-magnesium-phosphate fertilizer can be obtained through screening.
Example 2
A method for granulating powdered rock phosphate comprises the following steps: 1 part of sodium bentonite with the water content of 20 percent, 5 parts of monopotassium phosphate, 88 parts of powdered phosphorite, 1 part of white diatomite and 5 parts of dead burned magnesium oxide are ground to 50 meshes in a ball mill, fully mixed, then continuously sprayed with water in a roller granulator for rolling granulation, and when the particle size of spheres reaches 10mm, the spheres are discharged through the outlet of the granulator. The obtained spheres are placed in the air for 3 hours, the strength can reach 100N, and the spheres with the size required by the production of the calcium-magnesium-phosphate fertilizer can be obtained through screening.
Example 3
A method for granulating ground phosphate rock comprises the following steps: 10 parts of sodium bentonite with the water content of 10 percent, 10 parts of potassium monohydrogen phosphate, 60 parts of powdered phosphorite, 10 parts of light-grey-brown diatomite and 10 parts of heavy-burned magnesium oxide are crushed to 200 meshes in a ball mill, fully mixed, then continuously sprayed with water in an extruder, extruded and granulated, and discharged when the particle size reaches the specification of 30 mm. The obtained particles are placed in the air for 60 hours, the strength can reach 200N, and the blocks with the size required by producing the calcium magnesium phosphate fertilizer or the silicon fertilizer can be obtained by sieving.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (7)
1. A method for granulating powdered rock phosphate is characterized by comprising the following steps: 1-20 parts of bentonite, 5-20 parts of phosphate, 20-88 parts of powdered phosphorite, 1-20 parts of diatomite and 5-20 parts of magnesium oxide are ground in a ball mill to a certain fineness, fully mixed, granulated in a disc or a roller or an extruder, continuously sprayed with water until the granules reach a certain size, placed in the air for 3-120 hours until the strength reaches 100-300N, and screened to obtain the required granules capable of meeting the production requirement of the calcium magnesium phosphate fertilizer or the silicon fertilizer.
2. The method for granulating powdered rock phosphate according to claim 1, characterized in that: the bentonite is calcium-based or sodium-based bentonite, and the water content is 1-20%.
3. The method for granulating powdered rock phosphate according to claim 1, characterized in that: the phosphate is one or a mixture of more than two of ammonium phosphate, monopotassium phosphate and monopotassium phosphate.
4. The method for granulating powdered rock phosphate according to claim 1, wherein: the diatomite is white, off-white, gray or light grey brown diatomite, and the content of silicon dioxide is not lower than 50%.
5. The method for granulating powdered rock phosphate according to claim 1, wherein: the magnesium oxide is dead-burned magnesium oxide or/and light-burned magnesium oxide, and the content of the magnesium oxide is not less than 60%.
6. The method for granulating powdered rock phosphate according to claim 1, wherein: and the bentonite, the phosphate, the powdered phosphorite, the diatomite and the magnesium oxide are crushed in a ball mill to be 50-400 meshes in fineness and then discharged.
7. The method for granulating powdered rock phosphate according to claim 1, wherein: the particle size is 10-50 mm round particles or irregular blocks.
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