WO2002020400A1 - Procede de preparation d'acide phosphorique par voie humide - Google Patents
Procede de preparation d'acide phosphorique par voie humide Download PDFInfo
- Publication number
- WO2002020400A1 WO2002020400A1 PCT/CN2001/000796 CN0100796W WO0220400A1 WO 2002020400 A1 WO2002020400 A1 WO 2002020400A1 CN 0100796 W CN0100796 W CN 0100796W WO 0220400 A1 WO0220400 A1 WO 0220400A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reaction
- sulfuric acid
- tank
- concentration
- slurry
- Prior art date
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
- C01B25/228—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen one form of calcium sulfate being formed and then converted to another form
- C01B25/231—Dihydrate-hemihydrate process
Definitions
- the invention relates to the field of phosphoric acid production, in particular to an improvement of a wet-process phosphoric acid production process. Background technique
- Phosphoric acid is an important chemical raw material, and its production method is divided into two categories, wet method and thermal method.
- the typical method for making phosphoric acid by wet process is to decompose the phosphate rock with sulfuric acid, and the obtained phosphoric acid slurry is separated into liquid and solid to obtain phosphoric acid and calcium sulfate.
- the production method of wet-process phosphoric acid can be divided into two-water method, half-water method, anhydrous method, half-water one-two-water method and two-water half-water method.
- the dihydrate method is the main method of phosphoric acid production today. Its output accounts for more than 80% of the total phosphoric acid production, and the scale of the device has become larger.
- the two-water method has two disadvantages: one is the eutectic phenomenon of CaHP0 4 in the gypsum crystal lattice, the P 2 0 5 loss is serious, and the recovery rate is not high; the other is that the phosphoric acid concentration is not high, only about 30%. At present, most of the phosphoric acid production in China uses the dihydrate method, and only a few use the semi-water method or the semi-water one or two water method. Disclosure of invention
- the purpose of the present invention is to provide a production process of phosphoric acid, which is a dihydrate and half-water process. This process can use low-grade phosphate rock to produce high-concentration phosphoric acid and obtain high-quality phosphorous with low phosphorus content. Gypsum to suit the needs of the production of sulfuric acid and cement.
- the solution of the present invention is to input the phosphate rock slurry and sulfuric acid in two steps and directly shunt a part of the reaction slurry to the conversion tank to participate in the conversion of dihydrate gypsum.
- the invention uses the following production processes:
- the input amount of phosphate ore slurry and sulfuric acid is 70-90% of the total amount of the feed, and the control reaction temperature is 75-85:, the liquid-solid ratio is 2.3-2.6, and the concentration of S0 3 in the liquid phase is 0.04- 0.07 g / L, the concentration of P 2 0 5 in the reaction liquid phase is 28-30%.
- the secondary reaction solution enters the second reaction tank 2, and the remaining phosphate ore slurry and sulfuric acid are added to the second reaction tank to complete the reaction.
- a part of the slurry 8 is diverted to the conversion tank 4, and its partial flow is 10-30% of the total amount of the slurry flowing out after the secondary reaction.
- the remaining part 7 enters the separator 5 to extract the finished phosphoric acid.
- the concentration of phosphoric acid product is P 2 0 5 33-39%.
- the supplemental amount of sulfuric acid is 0-15% of the amount of sulfuric acid put into the first reaction tank.
- the control temperature is 90-105 ° C
- the liquid-solid ratio is 2.5-3
- the concentration of liquid phase S0 3 is 0.07-0.09g / L.
- the concentration of P 2 0 5 in the liquid phase is about 24-30%. .
- the transformation liquid enters the filter 6 for filtration and separation, and the filtrate 9 (P 2 0 5 concentration is 24-30%) is returned to the first reaction tank.
- the filter cake is the hemihydrate gypsum raw material, and the crystal water content is 4-83 ⁇ 4,
- the adsorbed water is about 18-20%. After natural hydration into dihydrate gypsum, the adsorbed water is only 5-10%. It can be used as raw materials for the production of sulfuric acid and cement, and can also be used as gypsum board and other building materials.
- An important feature of the present invention is that phosphorus ore pulp and sulfuric acid are divided into two reaction tanks for decomposition reaction, and 70-90% of the phosphate ore pulp and sulfuric acid are input in the first reaction tank, which can control a lower P 205 and the concentration of free sulfuric acid concentration as high as possible, in order to obtain good crystallization conditions to reduce the loss P eutectic 205; a second reaction vessel additional portion of phosphate rock and sulfuric acid slurry can be controlled with a groove High F 2 0 5 concentration (up to 30-35%), and maintained good gypsum crystal growth conditions, gypsum crystals are coarse and uniform, and have good filtration performance.
- Another important feature of the present invention is that a part of the material liquid flowing out after the completion of the reaction in the second reaction tank is directly shunted into the conversion tank to participate in the conversion reaction of the dihydrate stone paste separated by the centrifuge.
- an appropriate amount of sulfuric acid can also be added according to the actual situation, so that the liquid phase of the conversion tank has a higher concentration of sulfuric acid and phosphoric acid, thereby forming conditions for stable conversion of dihydrate gypsum to hemihydrate gypsum, which not only promotes the conversion process And hemihydrate gypsum crystals grow up, and can prevent "over-dehydration" of hemihydrate gypsum.
- a filtration assisting step may be added between the conversion tank 4 and the filter 6, that is, a filter assisting tank 5 is added in between, so that the conversion solution from the conversion tank enters the filter assisting tank. 5.
- the porous coke particles can adsorb the fluorosilicic acid and other components present in the slurry, increase the porosity of the filter material, thereby increasing the filtration speed of the hemihydrate gypsum and increasing the production capacity of the filter by 10-30%.
- FIG. 1 is a schematic diagram of a production process of phosphoric acid according to the present invention.
- the phosphate ore pulp, sulfuric acid and the light phosphoric acid 9 returned from the filter 6 enter the first reaction tank 1 for decomposition reaction, and the reaction time is about 1.5-2 hours.
- the added amounts of the phosphate ore pulp and sulfuric acid are respectively It accounts for about 80% of its total input.
- the primary reaction solution enters the second reaction tank, and part of the phosphate slurry and sulfuric acid are added to the second reaction tank to complete the reaction.
- the reaction time is about 1.5-2 hours. It accounts for about 20% of its total input.
- P 2 0 5 to give a concentration of 33--39% of the finished phosphoric acid.
- the dihydrate gypsum 10 separated from the separator 3 enters the conversion tank 4 and is mixed with the divided slurry 8 after the secondary reaction, and an appropriate amount of sulfuric acid may be added to perform the conversion reaction according to the actual situation.
- Hydrogypsum is converted into hemihydrate gypsum here, and the reaction time is about 40-60 minutes.
- the transformation liquid filter 6 is filtered, and the filtrate contains 24-30% P 2 0 5 alimentic acid returned to the first reaction tank.
- the filter cake is hemihydrate gypsum, which contains 4-8% crystal water and 18-20 adsorbed water. %, Containing P 2 0 5 0.05-0.2%, as raw materials for the production of sulfuric acid and cement, can also be used as gypsum board and other building materials. The best way to implement the invention
- the input amount of phosphate ore slurry and sulfuric acid was 71% and 72% of the total amount of the feed, the reaction temperature was controlled at 79 ° C, the liquid-solid ratio was 2.55, and the concentration of S0 3 in the liquid phase was 0.064g / L, reaction time was 1.8 hours.
- the concentration of P 2 0 5 in the reaction liquid phase was 28.9%.
- the primary reaction solution enters the second reaction tank, and the remaining 29% phosphate rock and 28% sulfuric acid are added to the second reaction tank to complete the reaction.
- the reaction temperature was controlled at 74 ° C.
- the liquid-solid ratio was 2.59
- the concentration of SO 3 in the liquid phase was 0.038 g / L
- the reaction time was 1.6 hours.
- the concentration of P 2 0 5 in the reaction liquid phase was 33.1%.
- the added amount of sparse acid is 11% of the amount of sulfuric acid introduced into the second reaction tank.
- the temperature in the conversion tank is controlled at 96 ° C, the liquid-solid ratio is 2.77, the concentration of liquid phase S0 3 is 0.079g / L, and the reaction time is 54. min at which time the liquid phase F 2 0 5 concentration of approximately 27.4%.
- the conversion solution enters the filter aid tank, and coke powder is added so that the ratio of the added amount to the gypsum is 1:21, after mixing into the filter separated by filtration, the filtrate (P 2 0 5 concentration of 27.1%) returns to the first reaction vessel and the filter cake is the hemihydrate gypsum raw material, the crystal water content of 6.78%, the adsorption
- the water is about 19.16%
- the P 2 0 5 content in the hemihydrate gypsum is 0.13%
- the P 2 0 5 recovery rate is 99.1%.
- After natural hydration into dihydrate gypsum, its absorbed water is only 6.81%, which can be used as raw materials for the production of sulfuric acid and cement, and can also be used as gypsum and other building materials.
- the primary reaction solution enters the second reaction tank, and the remaining 22% of phosphate rock pulp and 20% of sparse acid are added in the second reaction tank to complete the reaction.
- the reaction temperature was controlled at 78 ° C
- the liquid-to-solid ratio was 2.57
- the concentration of S0 3 in the liquid phase was 0.031 g / L
- the reaction time was 1.6 hours.
- the concentration of P 2 0 5 in the reaction liquid phase was 34.3%.
- the filtrate (P 2 0 5 concentration of 27.9%) returns to the first reaction vessel and the filter cake is the hemihydrate gypsum raw material, the water content of the crystal 7.133 ⁇ 4, adsorption
- the water is about 18.94%
- the P 2 0 5 content in the hemihydrate gypsum is 0.08%
- the P 2 0 5 recovery rate is 99.43 ⁇ 4.
- After natural hydration into dihydrate gypsum, its adsorption water is only 6.58%. It can be used as raw material for the production of sulfuric acid and cement. Can be used as gypsum and other building materials.
- two reaction tanks are used to separately input phosphate ore slurry and sulfuric acid, and a part of the reacted feed liquid is directly diverted to a conversion tank to participate in the conversion of dihydrate gypsum.
- This process improves the yield of P 2 0 5 and its recovery rate can reach more than 99%, and can obtain high-quality hemihydrate gypsum with a P 2 0 5 content of 0.05-0.2% and a crystal water content of 4- 8%, adsorbed water content of about 19%.
- hemihydrate gypsum After hemihydrate gypsum is naturally hydrated, it can be used to produce sulfuric acid and cement without drying.
- Adding coke powder to the filter material as a filter aid increases the production capacity of the filter, reduces energy consumption, and has obvious economic and social benefits.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001287516A AU2001287516A1 (en) | 2000-09-01 | 2001-05-15 | A method of preparing wet process phosphoric acid |
US10/362,845 US7172742B2 (en) | 2000-09-01 | 2001-05-15 | Method of preparing wet process phosphoric acid |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN00111330A CN1340457A (zh) | 2000-09-01 | 2000-09-01 | 一种磷酸生产工艺 |
CN00111330.5 | 2000-09-01 |
Publications (1)
Publication Number | Publication Date |
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WO2002020400A1 true WO2002020400A1 (fr) | 2002-03-14 |
Family
ID=4581249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2001/000796 WO2002020400A1 (fr) | 2000-09-01 | 2001-05-15 | Procede de preparation d'acide phosphorique par voie humide |
Country Status (4)
Country | Link |
---|---|
US (1) | US7172742B2 (zh) |
CN (1) | CN1340457A (zh) |
AU (1) | AU2001287516A1 (zh) |
WO (1) | WO2002020400A1 (zh) |
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BE1019055A3 (fr) * | 2009-12-02 | 2012-02-07 | Prayon Technologies | Procede de production d'acide phosphorique. |
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2000
- 2000-09-01 CN CN00111330A patent/CN1340457A/zh active Pending
-
2001
- 2001-05-15 AU AU2001287516A patent/AU2001287516A1/en not_active Abandoned
- 2001-05-15 WO PCT/CN2001/000796 patent/WO2002020400A1/zh active Application Filing
- 2001-05-15 US US10/362,845 patent/US7172742B2/en not_active Expired - Fee Related
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US3416887A (en) * | 1964-08-05 | 1968-12-17 | Central Glass Co Ltd | Method of manufacturing wet process phosphoric acid |
US4059674A (en) * | 1972-07-18 | 1977-11-22 | Pullman Incorporated | Method for manufacturing phosphoric acid and gypsum |
JPS57129811A (en) * | 1981-01-28 | 1982-08-12 | Toyo Soda Mfg Co Ltd | Manufacture of wet process phosphoric acid |
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RU2094365C1 (ru) * | 1996-01-30 | 1997-10-27 | Открытое акционерное общество Научно-исследовательский институт по удобрениям и инсектофунгицидам им.проф.Я.В.Самойлова | Способ получения фосфорной кислоты |
Also Published As
Publication number | Publication date |
---|---|
AU2001287516A1 (en) | 2002-03-22 |
CN1340457A (zh) | 2002-03-20 |
US7172742B2 (en) | 2007-02-06 |
US20040047790A1 (en) | 2004-03-11 |
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