CN1301681A - Medium concentrate sulfur-base compound fertilizer and its producing method - Google Patents
Medium concentrate sulfur-base compound fertilizer and its producing method Download PDFInfo
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- CN1301681A CN1301681A CN 99120459 CN99120459A CN1301681A CN 1301681 A CN1301681 A CN 1301681A CN 99120459 CN99120459 CN 99120459 CN 99120459 A CN99120459 A CN 99120459A CN 1301681 A CN1301681 A CN 1301681A
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- 239000003337 fertilizer Substances 0.000 title claims abstract description 51
- 150000001875 compounds Chemical class 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 7
- 239000012141 concentrate Substances 0.000 title 1
- 239000002002 slurry Substances 0.000 claims abstract description 65
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000002367 phosphate rock Substances 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 21
- 238000005507 spraying Methods 0.000 claims abstract description 14
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 13
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 6
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 47
- 150000003464 sulfur compounds Chemical class 0.000 claims description 36
- 229910019142 PO4 Inorganic materials 0.000 claims description 24
- JTNCEQNHURODLX-UHFFFAOYSA-N 2-phenylethanimidamide Chemical compound NC(=N)CC1=CC=CC=C1 JTNCEQNHURODLX-UHFFFAOYSA-N 0.000 claims description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims description 22
- 229910000343 potassium bisulfate Inorganic materials 0.000 claims description 22
- 239000001103 potassium chloride Substances 0.000 claims description 22
- 235000011164 potassium chloride Nutrition 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- 239000011268 mixed slurry Substances 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 13
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 12
- 229910052925 anhydrite Inorganic materials 0.000 claims description 10
- 229910052586 apatite Inorganic materials 0.000 claims description 10
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004202 carbamide Substances 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 230000035484 reaction time Effects 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 5
- 230000003472 neutralizing effect Effects 0.000 claims description 5
- 238000007796 conventional method Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011591 potassium Substances 0.000 abstract description 9
- 239000002689 soil Substances 0.000 abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000006386 neutralization reaction Methods 0.000 abstract description 3
- 235000013619 trace mineral Nutrition 0.000 abstract description 2
- 239000011573 trace mineral Substances 0.000 abstract description 2
- 239000005864 Sulphur Substances 0.000 abstract 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 abstract 1
- 238000005453 pelletization Methods 0.000 abstract 1
- 239000010802 sludge Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 12
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 8
- 239000011575 calcium Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- WZLMXYBCAZZIRQ-UHFFFAOYSA-N [N].[P].[K] Chemical compound [N].[P].[K] WZLMXYBCAZZIRQ-UHFFFAOYSA-N 0.000 description 2
- 229910015372 FeAl Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 150000003841 chloride salts Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Fertilizers (AREA)
Abstract
A compound fertilizer is a medium-concentration sulphur base one with a total nitrogen phosphorus and potassium content of 25-35 % and is produced through the reaction of excessive concentrated sulfuric acid and KCl to produce KH2SO4, further proceeding the reaction with phosphate rock slurry, neutralization by introducing ammonia, then spraying and pelletizing. The medium-concentration sulfur-base compound fertilizer also contains trace elements good for soil. The direct reaction of KH2SO4 and phosphate rock slurry results is low production cost, no waste sludge produced and reduced environemntal pollution.
Description
A medium-concentration sulfur-based compound fertilizer and a production method thereof belong to the technical field of chemical fertilizers and production thereof, and relate to a compound fertilizer produced by using sulfuric acid, potassium chloride, ground phosphate rock and liquid ammonia and a production method thereof.
The existing sulfur-based compound fertilizer is a high-concentration compound fertilizer, wherein the content of nitrogen, phosphorus and potassium is 15%, and the demand on nitrogen and phosphorus is low because the content of nitrogen and phosphorus in domestic soil is high, so that the concentration of nitrogen and phosphorus in the high-concentration compound fertilizer is high relative to the current soil condition. Some middle concentration compound fertilizers are prepared by high concentration fertilizers and fillers, while middle concentration sulfur-based compound fertilizers have not been produced, used or reported.
A process for preparing high-concentration S-base composite fertilizer includes such steps as reaction between sulfuric acid and potassium chloride to obtain potassium bisulfate slurry, mixing it with phosphoric acid, introducing ammonia gas for neutralization, concentrating, spraying slurry, granulating and drying. For example, the patent No. 97105751 granted by the Chinese patent office discloses a production method of a sulfur-based nitrogen-phosphorus-potassium compound fertilizer, which uses concentrated sulfuric acid and potassium chloride to generate potassium bisulfate, adds diluted phosphoric acid, neutralizes with ammonia, adds urea, and produces the sulfur-based nitrogen-phosphorus-potassium compound fertilizer with 15% of nitrogen, phosphorus and potassium contents respectively through spraying, granulating and drying. The phosphoric acid used by the production method is prepared from phosphorite and is further used for producing compound fertilizer, the cost is high, and a large amount of waste phosphogypsum (calcium sulfate) is generated in the process of preparing the phosphoric acid, so that waste is caused.
The invention aims to provide a medium-concentration sulfur-based compound fertilizer suitable for the current soil moisture content and a production method of the medium-concentration sulfur-based compound fertilizer so as to overcome the defects of the prior art.
The medium-concentration sulfur-based compound fertilizer consists of the following components: main phases: (NH)4.K)2SO4.CaSO4.H2O minor phase: NH (NH)4H2O4(NH4)2SO4Micro-phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O-apatite α -SiO2The contents (weight) of the components in the product are as follows: main phases: (NH)4.K)2SO4.CaSO4.H2O60-85% minor phase: NH (NH)4H2PO45-15％
(NH4)2SO43-10% minor phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O 2-7％
1-4% of apatite
α-SiO21-4% of the total amount of the product, and the balanceMinute, total content about 2-5%, mainly metal salts and chlorides. In the product, nitrogen (N) and phosphorus (P)2O5) Potassium (K)2O) is 6-10%, 5-9%, 13-17% respectively, and total N, P, K content is 25-35%.
The product of the invention is prepared by preparing potassium bisulfate from concentrated sulfuric acid and potassium chloride, then directly reacting with ground phosphate rock, then introducing ammonia gas for neutralization to prepare slurry, adding urea into the slurry, and then spraying, granulating and drying.
The production method of the sulfur-based compound fertilizer comprises the following steps: 1. using concentrated sulfuric acid (92-98%) and potassium chloride (solid, K)255-62% by weight of O) to prepare potassium bisulfate slurry, and recovering HCL. During reaction, concentrated sulfuric acid is heated to 70-120 ℃, potassium chloride is put into the concentrated sulfuric acid, and the molar ratio of the concentrated sulfuric acid to the potassium chloride is 1.1-1.5: 1. The reaction is as follows: the reaction time is 60-120 minutes, and the reaction temperature is 70-120 ℃.
2. The potassium bisulfate slurry containing excessive sulfuric acid and the phosphate rock powder (the main component is Ca)5F(PO4)3]Slurry reaction, the ground phosphate rock is particles ground from phosphate rock, the phosphate rock powder is made into slurry by adding water, its liquid-solid ratio (by weight) is 0.8-2.5: 1]Preparing mixed slurry, and recovering HF, wherein the reaction temperature is 70-90 ℃ and the reaction time is 60-90 minutes. The weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 1.8-2.5: 1.
3. The mixture slurry prepared above is neutralized to weak acidity (PH 3.5-6.5) with gaseous ammonia.
4. Spraying, granulating and drying the slurry by a conventional method to obtain the medium-concentration sulfur-based compound fertilizer, wherein N, P (P) is used as the raw material2O5)、K(K2O) is 6-10%, 5-9% and 13-17% respectively.
If the product has a low N content, urea (N46%) may be added to the slurry.
Because the grades of the ground phosphate rock are different at different places, the ground phosphate rock is firstly tested in the production processGrade, and calculating the formula of production according to the product, the product and the method of the invention are to contain P2O5The phosphorus ore powder of 30 percent is used as standard calculation to produce the medium-concentration sulfur-based compound fertilizer.
The products of the invention and the process for their production are described in detail below
The medium-concentration sulfur-based compound fertilizer has the total N content of 7-9 percent and the total phosphorus (P)2O5) 6-8% of total potassium (K)2O) content of 14-16%, and the phases are as follows: main phases: (NH)4.K)2SO4.CaSO4.H2O72-80% minor phase: NH (NH)4H2PO47-11％ (NH4)2SO44-10% minor phase: (FeAl) (NH)4)2H2F(PO4)2.nH2O3-6% apatite 1-3% α -SiO21-3％
The production method of the sulfur-based compound fertilizer with the content comprises the following steps: 1. using concentrated sulfuric acid (98%) and potassium chloride (solid, K)2The O content is 60 percent by weight) is reacted in a reaction kettle to prepare potassium bisulfate slurry, and HCL is recovered. During reaction, concentrated sulfuric acid is heated to 70-80 ℃, potassium chloride is put into the concentrated sulfuric acid, and the molar ratio of the concentrated sulfuric acid to the potassium chloride is 1.1-1.4: 1. The reaction is as follows: the reaction time is 60-90 minutes.
2. Excessive potassium bisulfate slurry prepared in the above way and phosphate rock powder (the main component is Ca)5F(PO4)3]The slurry enters a reaction tank to react to prepare mixed slurry, the liquid-solid ratio of the ground phosphate rock slurry is 0.8-1.5: 1, the weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 2.0-2.5: 1, HF is recovered, and the mixed slurry is emptied after washing.
3. And (3) feeding the prepared mixed slurry into a mixed acid storage tank, pumping the mixed slurry into a tubular reactor by a pump, introducing ammonia gas, and neutralizing to weak acidity to obtain the slurry with the pH value of 4.5-5.5.
4. The weakly acidic slurry is put into a slurry spraying groove, and urea (the nitrogen content is 46 percent) is added, wherein the adding amount is 0.03 to 0.05 ton per cubic slurry.
5. Spraying the slurry, granulating, drying, sieving, cooling, and packaging to obtain intermediate-concentration sulfur-based compound fertilizer containing N, P (P)2O5)、K(K2O) content of 7-9%, 6-8% and 14-16%, and total N, P, K content of 25-35%.
Example 1
The medium-concentration sulfur-based compound fertilizer has the total N content of 8 percent and total phosphorus (P)2O5)Content 7%, total potassium (K)2O) content 15%, and its phase composition is as follows: main phases: (NH)4.K)2SO4. CaSO4.H2O74.8% minor phase: NH (NH)4H2PO48.5％ (NH4)2SO45.7% minor phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O4.4% apatite 2.6% α -SiO21.23% and the balance 2.77%
The production method of the sulfur-based compound fertilizer with the content comprises the following steps: 1. using concentrated sulfuric acid (98%) and potassium chloride (solid, K)2The O content is 60 percent by weight) is reacted in a reaction kettle to prepare potassium bisulfate slurry, and HCL is recovered. During reaction, concentrated sulfuric acid is heated to 80 ℃, potassium chloride is put into the concentrated sulfuric acid, and the molar ratio of the concentrated sulfuric acid to the potassium chloride is 1.4: 1. The reaction is as follows: the reaction time was 90 minutes.
2. The potassium bisulfate slurry containing excessive sulfuric acid and the phosphate rock powder (the main component is Ca)5F(PO4)3]And (3) allowing the slurry to enter a reaction tank for reaction to prepare mixed slurry, wherein the liquid-solid ratio of the ground phosphate rock slurry is 1.5, and the weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 2.4, recovering HF, washing and emptying.
3. And (3) feeding the prepared mixed slurry into a mixed acid storage tank, pumping the mixed slurry into a tubular reactor by a pump, introducing ammonia gas, and neutralizing to weak acidity to obtain the slurry with the pH value of 5.0.
4. Weakly acidic slurry is put into a slurry spraying groove, and urea (the nitrogen content is 46 percent) is added in an amount of 0.04 ton per cubic slurry.
5. Spraying the slurry, granulating, drying, sieving, cooling, and packaging to obtain intermediate-concentration sulfur-based compound fertilizer containing N, P (P)2O5)、K(K2O) contents of 8%, 7% and 15%, respectively.
Example 2
The medium-concentration sulfur-based compound fertilizer has the total N content of 9 percent and total phosphorus (P)2O5) Content 6%, total potassium (K)2O) content 14%, the phase composition is as follows: main phases: (NH)4.K)2SO4. CaSO4.H2O70.5% minor phase: NH (NH)4H2PO48.0％ (NH4)2SO49.8％Micro-phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O4.5% apatite 2.4% α -SiO21.22% and the balance 3.58%
The production method of the sulfur-based compound fertilizer with the content comprises the following steps: 1. using concentrated sulfuric acid (98%) and potassium chloride (solid, K)2The O content is 60 percent by weight) is reacted in a reaction kettle to prepare potassium bisulfate slurry, and HCL is recovered. During reaction, concentrated sulfuric acid is heated to 80 ℃, potassium chloride is put into the concentrated sulfuric acid, and the molar ratio of the concentrated sulfuric acid to the potassium chloride is 1.35: 1. The reaction is as follows: the reaction time was 90 minutes.
2. The potassium bisulfate slurry containing excessive sulfuric acid and the phosphate rock powder (the main component is Ca)5F(PO4)3]And (3) allowing the slurry to enter a reaction tank for reaction to prepare mixed slurry, wherein the liquid-solid ratio of the ground phosphate rock slurry is 1.5, and the weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 2.5, recovering HF, washing and emptying.
3. And (3) feeding the prepared mixed slurry into a mixed acid storage tank, pumping the mixed slurry into a tubular reactor by a pump, introducing ammonia gas, and neutralizing to weak acidity to obtain the slurry with the pH value of 5.5.
4. Weakly acidic slurry is put into a slurry spraying groove, and urea (the nitrogen content is 46 percent) is added in an amount of 0.05 ton per cubic slurry.
5. Spraying the slurry, granulating, drying, sieving, cooling, and packaging to obtain intermediate-concentration sulfur-based compound fertilizer containing N, P (P)2O5)、K(K2O) contents of 9%, 6% and 14%, respectively.
Example 3
The medium-concentration sulfur-based compound fertilizer has the total N content of 7 percent and the total phosphorus (P)2O5) Content 9%, total potassium (K)2O) content 15%, and its phase composition is as follows: main phases: (NH)4.K)2SO4. CaSO4.H2O74.9% minor phase: NH (NH)4H2PO48.8％ (NH4)2SO45.8% minor phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O4.4% apatite 2.6% α -SiO21.24% and the balance 2.26%
The production method of the sulfur-based compound fertilizer with the content comprises the following steps: 1. with concentrated sulfuric acid (9)8%) and potassium chloride (solid, K)2The O content is 60 percent by weight) is reacted in a reaction kettle to prepare potassium bisulfate slurry, and HCL is recovered. During reaction, concentrated sulfuric acid is heated to 80 ℃, potassium chloride is put into the concentrated sulfuric acid, and the molar ratio of the concentrated sulfuric acid to the potassium chloride is 1.38: 1. The reaction is as follows: the reaction time was 90 minutes.
2. The potassium bisulfate slurry containing excessive sulfuric acid and the phosphate rock powder (the main component is Ca)5F(PO4)3]And (3) reacting the slurry in a reaction tank to obtain mixed slurry, wherein the liquid-solid ratio of the ground phosphate rock slurry is 1.5, and the weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 2.3, recovering HF, and emptying afterwashing.
3. And (3) feeding the prepared mixed slurry into a mixed acid storage tank, pumping the mixed slurry into a tubular reactor by a pump, introducing ammonia gas, and neutralizing to weak acidity to obtain the slurry with the pH value of 5.0.
4. Weakly acidic slurry is put into a slurry spraying groove, and urea (the nitrogen content is 46 percent) is added in an amount of 0.03 ton per cubic slurry.
5. Spraying the slurry, granulating, drying, sieving, cooling, and packaging to obtain intermediate-concentration sulfur-based compound fertilizer containing N, P (P)2O5)、K(K2O) contents of 7%, 9% and 15%, respectively.
The medium-concentration sulfur-based compound fertilizer has low nitrogen and phosphorus content and high potassium content, and simultaneously contains trace elements in the phosphate rock powder which are beneficial to soil, so that the medium-concentration sulfur-based compound fertilizer is suitable for the soil moisture content of the existing soil. Meanwhile, the sulfur element required by the soil is remained in the fertilizer, so that the waste of sulfur resources is reduced.
Claims (11)
1. The medium-concentration sulfur-based compound fertilizer is prepared by compounding KCL, sulfuric acid, ground phosphate rock and ammonia, and is characterized in that: n, P, K accounts for 6-10%, 5-9%, 13-17%, and total N, P, K accounts for 25-35%.
2. The medium-concentration sulfur-based compound fertilizer as claimed in claim 1, which is characterized in that: the phases are as follows:
main phases: (NH)4K)2SO4.CaSO4.H2O
Minor phase: NH (NH)4H2O4(NH4)2SO4
3. The medium-concentration sulfur-based compound fertilizer according to claim 2, wherein: the compound fertilizer also contains a trace phase:
(Fe.Al)(NH4)2H2F(PO4)2.nH2O
apatite and its use
α-SiO2
4. The medium-concentration sulfur-based compound fertilizer according to claim 2 or 3, wherein: the contents (weight) of the components are as follows:
main phases: (NH)4.K)2.CaSO4.H2O 60-85％
Minor phase: NH (NH)4H2PO45-15％
(NH4)2SO43-10％
Micro-phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O 2-7％
1-4% of apatite
α-SIO21-4％
5. The medium-concentration sulfur-based compound fertilizer as claimed in claim 4, wherein: the components are as follows:
main phases: (NH)4.K)2SO4.CaSO4.H2O 72-80％
Minor phase: NH (NH)4H2PO47-11％ (NH4)2SO44-10％
Micro-phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O3-6% apatite 1-3%
α-SIO21-3％
6. The medium-concentration sulfur-based compound fertilizer as claimed in claim 4, wherein: the components are as follows:
main phases: (NH)4.K)2SO4. CaSO4.H2O 74.8％
Minor phase: NH (NH)4H2PO48.5％ (NH4)2O45.7％
Micro-phase: (Fe.Al) (NH)4)2H2F(PO4)2.nH2O4.4% apatite 2.6%
α-SiO21.23％。
7. A medium-concentration sulfur-based compound fertilizer is prepared by compounding KCL, sulfuric acid, ground phosphate rock and ammonia, and is characterized in that: 1) using concentrated sulfuric acid (92-98%) and potassium chloride (solid, K)255-62% by weight of O) to prepare potassium bisulfate slurry, and recovering HCL. During reaction, concentrated sulfuric acid is heated to 70-120 ℃, potassium chloride is put into the concentrated sulfuric acid, and the molar ratio of the concentrated sulfuric acid to the potassium chloride is 1.1-1.5: 1. The reaction is as follows: the reaction time is 60-120 minutes, and the reaction temperature is 70-120 ℃.
2) Potassium bisulfate slurry containing excessive sulfuric acid prepared by the method and phosphate rock powder (the main component is Ca)5F(PO4)3]Reacting the slurry to prepare mixed slurry, recovering HF, wherein the liquid-solid ratio (by weight) of the ground phosphate rock slurry is 0.8-2.5: 1, the reaction temperature is 70-90 ℃, and the reactiontime is 60-90 minutes. The weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 1.8-2.5: 1.
3) And neutralizing the mixture slurry prepared by the method to weak acidity (pH value is 3.5-6.5) by using gas ammonia.
4) Spraying, granulating and drying the slurry by a conventional method to obtain the medium-concentration sulfur-based compound fertilizer, wherein N, P (P) is used as a raw material2O5)、K(K2O) is 6-10%, 5-9% and 13-17% respectively.
8. The method for producing a medium-concentration sulfur-based compound fertilizer as claimed in claim 6, wherein the method comprises the following steps: adding urea (N content is 46%) into the slurry, and the adding amount is 0.03-0.05 ton/m3And (4) slurry.
9. The method for producing a mid-concentration sulfur-based compound fertilizer as claimed in claim 6, wherein: the molar ratio of concentrated sulfuric acid to KCL is 1.1-1.5: 1.
10. The method for producing a mid-concentration sulfur-based compound fertilizer as claimed in claim 6, wherein: the weight ratio of the potassium bisulfate slurry to the ground phosphate rock is 1.8-2.5: 1.
11. The method for producing a mid-concentration sulfur-based compound fertilizer as claimed in claim 5, wherein: the liquid-solid ratio of the ground phosphate rock slurry is 0.8-2.5: 1.
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| CN 99120459 CN1301681A (en) | 1999-12-30 | 1999-12-30 | Medium concentrate sulfur-base compound fertilizer and its producing method |
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| CN 99120459 CN1301681A (en) | 1999-12-30 | 1999-12-30 | Medium concentrate sulfur-base compound fertilizer and its producing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102924175A (en) * | 2012-11-17 | 2013-02-13 | 寿光蔡伦中科肥料有限责任公司 | Lignin-containing organic-inorganic compound fertilizer prepared by ammonia-acid method as well as ammonia-acid production method |
-
1999
- 1999-12-30 CN CN 99120459 patent/CN1301681A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102924175A (en) * | 2012-11-17 | 2013-02-13 | 寿光蔡伦中科肥料有限责任公司 | Lignin-containing organic-inorganic compound fertilizer prepared by ammonia-acid method as well as ammonia-acid production method |
| CN102924175B (en) * | 2012-11-17 | 2014-07-30 | 寿光蔡伦中科肥料有限责任公司 | Lignin-containing organic-inorganic compound fertilizer prepared by ammonia-acid method as well as ammonia-acid production method |
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