CN103265000B - The preparation method of potassium primary phosphate - Google Patents
The preparation method of potassium primary phosphate Download PDFInfo
- Publication number
- CN103265000B CN103265000B CN201310182650.8A CN201310182650A CN103265000B CN 103265000 B CN103265000 B CN 103265000B CN 201310182650 A CN201310182650 A CN 201310182650A CN 103265000 B CN103265000 B CN 103265000B
- Authority
- CN
- China
- Prior art keywords
- filtrate
- solution
- stand
- primary phosphate
- volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Fertilizers (AREA)
Abstract
The present invention is a kind of preparation method of potassium primary phosphate, comprises the following steps: 1), prepare the normal temperature saturated solution of potassium sulfate; 2), the saturated solution of described potassium sulfate stirs and slowly adds monocalcium phosphate, and controls local temperature, lower than 35 degrees Celsius, in 6 hours reaction times, obtains stand-by solution; 3), by stand-by solution carry out press filtration, filtrate is stand-by; 4), filtrate reduced in volume, be concentrated into the 40%-50% that volume is filtrate volume, suction filtration while hot, obtains filtrate; 5), by filtrate be cooled to room temperature, crystallization is potassium primary phosphate.The preparation method of potassium primary phosphate of the present invention, byproduct is calcium sulfate, can make soil improvement agent.Production process is not polluted, and do not produce waste gas, waste water, production cost is low.
Description
Technical field
The present invention relates to a kind of preparation method of potassium primary phosphate, espespecially a kind of preparation method adopting potassium sulfate and monocalcium phosphate synthesis potassium primary phosphate.
Background technology
Potassium primary phosphate (KH
2pO
4) of many uses, consumption is huge.All there is the problems such as environmental pollution, energy consumption be higher in traditional technology.Traditional technology mainly contains Repone K and phosphoric acid synthesis technique, Repone K and an industrial ammonium synthesis technique.The cost of two kinds of methods, current Repone K and phosphoric acid lower slightly, shortcoming is that byproduct hydrochloric acid is difficult to process, the exhaust emission environment such as the hydrogen chloride gas discharged in production process, and heavy corrosion production unit.The method pricing that existing market adopts:
Produce potassium primary phosphate per ton to need:
Repone K: 74.5/136=0.548
Phosphoric acid: 98/136=0.72
Cost: 2800 yuan/ton, Repone K, 85% phosphoric acid 5500 yuan/ton
2800*0.548+ (5500*0.72/0.85)=1534.4+4658.8=6193.2 (yuan/ton)
Summary of the invention
For solving the problems of the technologies described above, the invention provides one and do not produce waste water, waste gas, and cost is lower than the preparation method of the potassium primary phosphate of traditional technology.
The present invention is a kind of preparation method of potassium primary phosphate, adopts potassium sulfate and monocalcium phosphate synthesis potassium primary phosphate.Potassium sulfate adopts fertilizer potassium sulfate.Monocalcium phosphate can select feed-level calcium biphosphate or threeflod calcium superphosphate fertilizer (coarse whiting) or general calcareous fertilisers material.For reducing costs, monocalcium phosphate adopts the general calcium of fertilizer, and the main component of general calcium is calcium sulfate and monocalcium phosphate.Reaction principle is:
K
2SO
4+Ca(H
2PO
4)
2＝2KH
2PO
4+CaSO
4↓
Comprise the following steps:
1) the normal temperature solution of potassium sulfate, is prepared;
2), the solution stirring of described potassium sulfate slowly adds monocalcium phosphate, and controls local temperature, lower than 35 degrees Celsius, in 6 hours reaction times, obtains stand-by solution;
3), by stand-by solution carry out press filtration, filtrate is stand-by;
4), filtrate reduced in volume, while hot suction filtration, obtain filtrate;
5), by step 4) filtrate that obtains is cooled to room temperature, and crystallization is potassium primary phosphate.
Preferably, described step 4) and step 5) in the middle of, also comprising step 4) filtrate that obtains is concentrated into the step of original volume 40%-50%.
Preferably, described step 2) index of stand-by solution that obtains is: 1) the light yellow or colourless transparent liquid of solution appearance; 2) pH value: 4.2-4.6; 3) [Ca
2+] grams per liter≤0.6; 4) [SO
4 2-] grams per liter≤1.5.
Preferably, described step 4) produce not tolerant be calcium sulfate and potassium primary phosphate mixture, dropping into feed reservoir can reuse.
Preferably, described monocalcium phosphate can select the fertile or general calcareous fertilisers material of feed-level calcium biphosphate or threeflod calcium superphosphate.
Preferably, the normal temperature solution of described potassium sulfate is normal temperature saturated solution.
Preferably, described step 4) in filtrate be concentrated into the 40%-50% that volume is filtrate volume.
Preferably, described potassium sulfate solution adopts fertilizer potassium sulfate to be prepared.
Advantageous Effects of the present invention is: the preparation method of potassium primary phosphate of the present invention, and byproduct is calcium sulfate, can make soil improvement agent.Production process is not polluted, and do not produce waste gas, waste water, production cost is low.Producting cost accounting:
Produce per ton cost:
Potassium sulfate 174/136*2=0.64
Ca(H
2PO
4)
2234/136*2＝0.86
Potassium sulfate cost: 3200*0.64=2048
Monocalcium phosphate adopts single superphosphate fertilizer material, and general calcium is containing Vanadium Pentoxide in FLAKES 18%, i.e. phosphoric acid calcium dihydrogen about 30%, 800-900 yuan/ton, and calculating monocalcium phosphate by 900 is 2700 yuan/ton,
2700*0.86＝2322
Produce potassium primary phosphate cost per ton: 2322+2048=4370 unit
Therefore raw materials cost is far below traditional technology, even if adopt feed-level calcium biphosphate cost also lower than existing technique.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1:
Comprise the following steps:
1), fertilizer potassium sulfate is adopted to be prepared the normal temperature saturated solution of potassium sulfate;
2), the saturated solution of described potassium sulfate stirs and slowly adds monocalcium phosphate, and select general calcareous fertilisers material as raw material, the main component of general calcareous fertilisers material is calcium sulfate and monocalcium phosphate.Reaction principle is:
K
2SO
4+Ca(H
2PO
4)
2＝2KH
2PO
4+CaSO
4↓
Controls local temperature, lower than 35 degrees Celsius, in 6 hours reaction times, obtains stand-by solution.The index of stand-by solution is: 1) the light yellow or colourless transparent liquid of solution appearance; 2) pH value: 4.2-4.6; 3) [Ca
2+] grams per liter≤0.6; 4) [SO
4 2-] grams per liter≤1.5; 5) [KH
2pO
4] grams per liter>=190.
3), by stand-by solution carry out press filtration, filtrate is stand-by;
4), filtrate reduced in volume, be concentrated into about the 40%-50% that volume is filtrate volume, suction filtration while hot, obtains filtrate; The not tolerant of generation is calcium sulfate and potassium primary phosphate mixture, and dropping into feed reservoir can reuse.
5), by above-mentioned steps 4) produce the filtrate that obtains and be cooled to room temperature, crystallization is potassium primary phosphate.
Embodiment 2:
Step 4 in embodiment 1) and step 5) in the middle of, also comprising step 4) filtrate that obtains is concentrated into the step of original volume 40%-50%.And then by the filtrate after secondary concentration according to step 5), be cooled to room temperature, crystallization is potassium primary phosphate.The product that the purity obtaining potassium primary phosphate like this obtains higher than first time crystallization.Because agricultural is lower by the purity required, if so producing agricultural potassium primary phosphate is reduce the method that production energy consumption can adopt embodiment 1, if require the potassium primary phosphate of high density, take the method for embodiment 2.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (1)
1. a preparation method for potassium primary phosphate, is characterized in that, comprises the following steps:
1) the normal temperature solution of potassium sulfate, is prepared;
2), the solution stirring of described potassium sulfate slowly adds monocalcium phosphate, and controls local temperature, lower than 35 degrees Celsius, in 6 hours reaction times, obtains stand-by solution;
3), by stand-by solution carry out press filtration, filtrate is stand-by;
4), filtrate reduced in volume, while hot suction filtration, obtain filtrate;
5), by step 4) filtrate that obtains is cooled to room temperature, and crystallization is potassium primary phosphate;
Described step 4) and step 5) in the middle of, also comprising step 4) filtrate that obtains is concentrated into the step of original volume 40%-50%;
Described step 2) index of stand-by solution that obtains is: 1) the light yellow or colourless transparent liquid of solution appearance; 2) pH value: 4.2-4.6; 3) [Ca
2+] grams per liter≤0.6; 4) [SO
4 2-] grams per liter≤1.5;
Described step 4) produce not tolerant for calcium sulfate and potassium primary phosphate mixture, dropping into feed reservoir can reuse;
Feed-level calcium biphosphate selected by described monocalcium phosphate or threeflod calcium superphosphate is fertile or general calcareous fertilisers material;
The normal temperature solution of described potassium sulfate is normal temperature saturated solution;
Described step 4) in filtrate be concentrated into the 40%-50% that volume is filtrate volume;
Described potassium sulfate solution adopts fertilizer potassium sulfate to be prepared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310182650.8A CN103265000B (en) | 2013-05-17 | 2013-05-17 | The preparation method of potassium primary phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310182650.8A CN103265000B (en) | 2013-05-17 | 2013-05-17 | The preparation method of potassium primary phosphate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103265000A CN103265000A (en) | 2013-08-28 |
| CN103265000B true CN103265000B (en) | 2015-11-25 |
Family
ID=49008680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310182650.8A Expired - Fee Related CN103265000B (en) | 2013-05-17 | 2013-05-17 | The preparation method of potassium primary phosphate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103265000B (en) |
-
2013
- 2013-05-17 CN CN201310182650.8A patent/CN103265000B/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 普钙厂联产磷酸二氢钾工艺研究;阿芳等;《云南化工》;20060430;第33卷(第2期);第38-40页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103265000A (en) | 2013-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102417169B (en) | Acidolysis method of magnesium-containing phosphate rock | |
| CN103113139B (en) | Method for producing multivariate nitro compound fertilizer from wet-process phosphoric acid purification sludge | |
| CN103524151B (en) | The method of decomposing phosphorite by using nitric acid phosphorus-potassium nitrate fertilizer coproduction phosphoric acid and calcium carbonate | |
| CN103803518A (en) | Method for preparing monopotassium phosphate by using wet-process phosphoric acid | |
| CN101348244B (en) | Preparation of ammonium potassium dihydrogen phosphate | |
| CN103072963B (en) | Method for producing potassium dihydrogen phosphate through wet-process phosphoric acid | |
| CN105367176A (en) | Multi-element comprehensive utilization process for phosphorus-potassium associated ore | |
| CN104744175B (en) | The method that nitrogen-phosphorus-potassium compound fertilizer is produced using phosphorus potassium associated minerals | |
| CN103483039B (en) | Method for producing secondary element mineral fertilizer by activating wollastonite | |
| CN103466579B (en) | The method of the complete water-soluble monoammonium phosphate of Wet-process Phosphoric Acid Production | |
| CN101708832A (en) | Method for producing defluorinated ammonium phosphate | |
| CN103183457A (en) | Method for recovering phosphorus in sewage sludge | |
| CN107418586A (en) | A kind of graininess paddy fields in south china acidic soil conditioner using rice husk as matrix | |
| CN103991882A (en) | Method for preparing potassium fluoride by using fluoride in liquid phase of wet process phosphoric acid | |
| CN102408102B (en) | Preparation method of nanometer iron phosphate | |
| CN107827113B (en) | Method for recovering fluorine in industrial monoammonium phosphate neutralized slag slurry | |
| CN104311190A (en) | Method for producing high concentration chlorine-based composite fertilizer by partially decalcifying hydrochloric acid decomposed phosphorite | |
| CN103011114A (en) | Method of producing monopotassium phosphate | |
| CN102249767A (en) | Compound fertilizer containing rare earth double salt and preparation method thereof | |
| CN101891561B (en) | Fertilizer preparation method by improving utilization rate and carrying out phosphorus dissolving to lighten soil pollution | |
| CN103265000B (en) | The preparation method of potassium primary phosphate | |
| CN105347321A (en) | Method for producing ammonium phosphate by using low-grade low-concentration raffinate acid | |
| CN102976858B (en) | Slow-release phosphate fertilizer regenerated from phosphorus-containing waste residue | |
| CN108456040A (en) | A kind of oil shale making siliceous fertilizer technique | |
| CN105732154A (en) | Method for preparing potassium fertilizer from potassium feldspar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 Termination date: 20180517 |