CN108862354A - A kind of four water-calcium nitrate fertilizer production system and production technology - Google Patents
A kind of four water-calcium nitrate fertilizer production system and production technology Download PDFInfo
- Publication number
- CN108862354A CN108862354A CN201811150250.8A CN201811150250A CN108862354A CN 108862354 A CN108862354 A CN 108862354A CN 201811150250 A CN201811150250 A CN 201811150250A CN 108862354 A CN108862354 A CN 108862354A
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- Prior art keywords
- calcium nitrate
- discharge port
- solution
- water
- pelletizer
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Classifications
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- 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
- C01F11/36—Nitrates
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C5/00—Fertilisers containing other nitrates
- C05C5/005—Post-treatment
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C5/00—Fertilisers containing other nitrates
- C05C5/04—Fertilisers containing other nitrates containing calcium nitrate
Abstract
The present invention provides a kind of four water-calcium nitrate fertilizer production systems, including acidolysis slot, neutralization chamber, multistage press filtration unit, preheating unit, multiple-effect evaporation unit and the pelletizing unit being sequentially connected in series by pipeline；The pelletizing unit includes roller pelletizer; its dehumidifier for being granulated cavity and capable of conveying dry cold air into it with one is connect; one is equipped with below the discharge port of the pelletizer can isolate the screening machine of size conforming particle; the screening machine includes conforming particle discharge port, bulky grain discharge port and little particle discharge port; the bulky grain discharge port is connect with a crusher; the little particle discharge port is connect with the feed inlet of a pelletizer, and the conforming particle discharge port is connect with baling press.The present invention uses screening machine that underproof particle screening returning charge into pelletizer, ensure that the qualification rate of product.
Description
Technical field
The invention belongs to field of fertilizer production, more particularly, to a kind of four water-calcium nitrate fertilizer production system and production work
Skill.
Background technique
Calcium nitrate products molecule formula is Ca (NO3)2, it is one of the chemical fertilizer of current market most worthy, optimum is applied to sweet tea
The crops such as dish, potato, barley, crudefiber crop, equably containing 11.8% nitrogen and 23.7% water-soluble calcium in every, calcium nitrate,
Be conducive to the absorption of Plant To Nutrient element, enhance gourd, fruit and vegetable resistance, promotes precocious, raising fruit and vegetable quality, agriculturally
Quick-acting fertilizer as acid soil.
The production technology of existing calcium nitrate is by nitric acid and quick lime as raw material, and by reaction, concentration is crystallized and made
?.Product purity made from this production technology and Diaspora Performance are poor, crystallization process overlong time, and produce serialization
Can be poor, the production cycle is too long, and evaporation and concentration energy consumption is excessive, and process environmental-protecting performance is poor.
Summary of the invention
In view of this, the present invention is directed to propose a kind of four water-calcium nitrate fertilizer production system and production technology, to shorten life
The period is produced, guarantees product qualification rate.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
A kind of four water-calcium nitrate fertilizer production system, including the acidolysis slot, neutralization chamber, multistage pressure being sequentially connected in series by pipeline
Filter unit, preheating unit, multiple-effect evaporation unit and pelletizing unit；
The pelletizing unit includes roller pelletizer, and the dehumidifying of dry cold air can be conveyed into it by being granulated cavity and one
Machine connection, the discharge port lower section of the pelletizer, which is equipped with one, can isolate the screening machine of size conforming particle, the screening machine packet
Conforming particle discharge port, bulky grain discharge port and little particle discharge port are included, the bulky grain discharge port is connect with a crusher, institute
It states little particle discharge port to connect with the feed inlet of a pelletizer, the conforming particle discharge port is connect with baling press.
Further, which further includes limestone storage bucket and infeed conveyor below, the lime stone storage
Lime stone can be sent into acidolysis slot by hopper.
Further, the neutralization chamber is connected to a milk of lime delivery pipe.
Further, the multistage press filtration unit includes the level-one pressure filter, level-one storage tank, second level filters pressing being sequentially connected in series
Device and second level storage tank, between the pipeline and level-one storage tank and second level pressure filter between the level-one pressure filter and neutralization chamber
Pipeline is in series with a filtrate pump.
Further, the preheating unit includes the level-one preheater and second level preheater being sequentially connected in series.
Further, the pelletizing unit further includes with pelletizer offgas duct to the exhaust scrubber being connected to, the tail gas
Water is filled in washer, and exhaust scrubber tail end is equipped with an exhaust tube straight up.
A kind of four water-calcium nitrate production method based on above system, including
S1 prepares slurry, including with excessive dilute nitric acid dissolution solid lime stone, until nitric acid ratio in dissolved solution
Reach 4%, obtains crude calcium nitrate solution；
Calcium hydroxide is added into crude calcium nitrate solution in S11, until solution pH value is made to reach 7；
S2 be concentrated by evaporation, by calcium nitrate solution obtained in S1 by triple effect evaporator evaporation and concentration, and triple effect evaporation it
Nitric acid calcium concentration is 68% in the nitric acid concentrated calcium solution obtained afterwards；
S3 is granulated, and the nitric acid concentrated calcium solution in S2 is passed through in the slurry inlet of pelletizer, and is passed through into pelletizer dry
The temperature of nitric acid concentrated calcium solution is down to 45 ° by dry cold air.
Further, S12 obtains calcium nitrate clarified solution to the solution multistage filtering that gained PH is 7 in S1.
Further, S21 preheats clarified solution before carrying out multiple-effect evaporation to clarified solution twice, and preheats for the first time
Solution is warming up to 85 ° from 75 °, solution is warming up to 95 ° from 85 ° by second of preheating.
Further, temperature is 155 DEG C in the level-one evaporator of the triple effect evaporator, and interior pressure is 0.3MpaG；Two
Temperature is 120 DEG C in grade evaporator, and interior pressure is 0.02MpaG；In three-level evaporator temperature be 80 DEG C, interior pressure be-
0.085MpaG。
Further, S31 is sieved, and resulting particle is sieved, and particle diameter is less than 2mm and greater than of 4mm
Grain crushes returning charge to being granulated machine inlet.
Compared with the existing technology, a kind of four water-calcium nitrate fertilizer production system of the present invention has the advantage that：
The present invention uses screening machine that underproof particle screening returning charge into pelletizer, ensure that the qualification rate of product；
The tail gas containing nitric acid calcium powder is washed using water is added in exhaust scrubber, to absorb calcium nitrate,
It is facilitated to put into production again；
Using triple effect evaporator, and by pressure reduction in evaporator, guarantee to remain to make solution in the lower situation of temperature
In moisture reduce, facilitate solution to be concentrated, and realize upper level in steam remained to after cooling in next stage evaporator
Effective use.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is this production system overall schematic；
Fig. 2 is this pelletizing unit schematic diagram；
Fig. 3 is calcium nitrate fertilizer production method flow diagram.
Description of symbols：
1- limestone storage bucket；2- acidolysis slot；3- neutralization chamber；4- multistage press filtration unit；41- level-one pressure filter；42- level-one
Filtrate dashpot；43- second level filtrate dashpot；44- second level filtrate dashpot；45- filtrate pump；51- level-one preheater；52- bis-
Grade preheater；6- multi-effect evaporator；61- level-one evaporator；62- primary separator；63- secondary evaporimeter；64- the second-order separation
Device；65- three-level evaporator；66- three-level separator；67- cooler；7- pelletizer；71- air blower；72- dehumidifier；73- discharging
Conveyer belt；74- elevator；701- core feed inlet；702- slurry feed inlet；703- discharge port；704- offgas duct；8- screening
Machine；81- returning charge conveyer belt；82- finished product conveyer belt；83- crusher；801- bulky grain discharge port；802- conforming particle discharge port；
803- little particle discharge port；9- exhaust scrubber, 91- exhaust tube.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply phase
To importance or implicitly indicate the quantity of indicated technical characteristic.The feature for defining " first ", " second " etc. as a result, can
To explicitly or implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
A kind of calcium nitrate fertilizer production device, including charging limestone unit comprising 1 lower section of storage hopper 1 and storage hopper
Infeed conveyor, lime stone can be transported to the top of an acidolysis slot 2 by the infeed conveyor, and 2 bottom of acidolysis slot is passed through
Dilute nitric acid solution carries out acidolysis reaction with lime stone：CaCO3+2HNO3→Ca(NO3)2+H2O+CO2, and due in calcium carbonate
Carbonic acid magnesium addition is usually contained, therefore that magnesium nitrate can be generated simultaneously when dilute nitric acid reaction, by dilute nitric acid reaction：MgCO3+
2HNO3→Mg(NO3)2+H2O+CO2, the thick calcium nitrate solution containing impurity is obtained, in the process, in order to make fully reacting, is needed
The dilute nitric acid solution of excessive addition into acidolysis slot 2, and the concentration of nitric acid after reaction is about 4%, obtained thick calcium nitrate is molten
Liquid is added in a neutralization chamber 3, and the neutralization chamber 3 is connect with a milk of lime delivery pipe, and adds milk of lime into neutralization chamber 3
(Ca(OH)2), make that neutralization reaction occurs in neutralization chamber 3：Ca(OH)2+2HNO3—→Ca(NO3)2+2H2O, and generate magnesium hydroxide
Precipitating removes the Mg ionic impurity in original solution, and the pH value of thick calcium nitrate solution is adjusted to 7 by addition milk of lime, obtains
Calcium nitrate solution；
Obtained calcium nitrate solution is added in multistage press filtration unit 4 and is filtered, sediment therein is removed, obtains
The clarified solution is added in a triple effect evaporation unit, is concentrated by evaporation three times by calcium nitrate clarified solution and sediment filter cake,
The nitric acid concentrated calcium solution that concentration is 68% is obtained, resulting concentrate is passed through in revolving drum granulator 7, the drying-granulating machine 7
It is described including core feed inlet 701, the slurry feed inlet 702, discharge port 703 and the offgas duct 704 that are connected to internal coating nozzles
It is equipped with discharge belt 73 below the discharge port 703 of pelletizer 7, is equipped with an elevator 74 below 73 tail end of discharge belt
The particle that pelletizer 7 is produced is promoted to the discharge port of elevator 74, institute by 74 feed inlet of elevator of lower part, the elevator 74
It states and is equipped with a screening machine 8 below the discharge port of elevator 74, with the screening machine 8, the screening machine 8 discharges including conforming particle
Mouth 802, bulky grain discharge port 801 and little particle discharge port 83, the bulky grain discharge port 801 are connect with a crusher 83, institute
It states little particle discharge port 803 to connect with the feed inlet of a pelletizer 7, the conforming particle discharge port 802 is connect with baling press, will
Large granule of the particle screening for the conforming particle of little particle, 2-4mm less than 2mm and greater than 4mm, is placed in one for large granule
In crusher 83, the discharge port of the crusher 83 is connect with the feed inlet of pelletizer 7, and the little particle is transmitted by a returning charge
The feed inlet for being delivered to pelletizer 7 with 81, the conforming particle is entered in product baling press by a finished product conveyer belt 82 to carry out
It is packaged.
It is cooling that four water-calcium nitrate is passed through one since four water-calcium nitrate easily absorbs water and prilling temperature is very low, before granulation
It is cooling in device 67, and granulation process is needed with the material in a large amount of dehumidified air cooling granulation machine 7, therefore air is passed through
Air blower 71 is passed through in a dehumidifier 72 and dehumidifies, and pelletizer 7 is passed through after cooling, to control the operating temperature in pelletizer 7, and by
It can not be bonded with preparatory particle in the slurry for often occurring the ejection of 7 inner nozzle of pelletizer during granulation and cause making
Often contain cured powdery calcium nitrate in the tail gas of grain machine 7, therefore by the offgas duct of pelletizer 7 704 and an exhaust scrubber
Connection, calcium nitrate are highly soluble in water, therefore using water as cleaning solution, powdery calcium nitrate is collected, and the tail gas after washing is passed through 11
Discharge.
The multistage press filtration unit 4 includes level-one filter press, the level-one filtrate dashpot 42, second level filter press being arranged in series
43 and second level filtrate dashpot 44, a filtrate pump 45 is equipped with before every grade of filter press, and liquid to be filtered is pumped into filter press
In.
The triple effect evaporation unit includes to concatenated level-one preheater 51 and second level preheater 52, and clarified solution passes through second level
Clarified solution is pumped into a level-one evaporator 61 by evaporative recirculation pump after preheating, and is passed through into 61 shell side of level-one evaporator
155 DEG C of steam, enter primary separator 62 afterwards, and clarified solution is pumped into second level by evaporative recirculation pump and steamed by the primary separator 62
It sends out in device 63, and is passed through 120 DEG C of steam into the shell side of secondary evaporimeter 63, enter second-stage separator 64, the second level later
Clarified solution is pumped into three-level evaporator 65 by separator 64 by evaporative recirculation pump, and is passed through into the shell side of three-level evaporator 65
80 DEG C of steam, enter triple effect separator afterwards, and the triple effect separator is connected to the slurry feed inlet 702 of pelletizer 7.
A kind of calcium nitrate fertilizer production method, including
S1 prepares slurry, including with excessive dilute nitric acid dissolution solid lime stone, until nitric acid ratio in dissolved solution
Reach 4%, obtains crude calcium nitrate solution；
Calcium hydroxide is added into crude calcium nitrate solution in S11, until solution pH value is made to reach 7；
S12 obtains calcium nitrate clarified solution to the gained PH solution multistage filtering for being 7；
S2 be concentrated by evaporation, by calcium nitrate solution obtained in S1 by triple effect evaporator evaporation and concentration, and triple effect evaporation it
Nitric acid calcium concentration is 68% in the nitric acid concentrated calcium solution obtained afterwards；
S21 to clarified solution carry out multiple-effect evaporation before clarified solution is preheated twice, and for the first time preheat by solution from
75 ° are warming up to 85 °, and solution is warming up to 95 ° from 85 ° by second preheating, and for the first time the heat source of preheating be secondary evaporimeter and
The steam condensate being discharged in three-level evaporator, the heat source of second of preheating are that level-one evaporator is condensed using the steam after discharge
Liquid；
S3 is granulated, and the nitric acid concentrated calcium solution in S2 is passed through in the slurry inlet of pelletizer 7, and is passed through into pelletizer 7
The temperature of nitric acid concentrated calcium solution is down to 45 ° by dry cold air；
S31 screening, resulting particle is sieved, and the particle by particle diameter less than 2mm and greater than 4mm crushes returning charge
To 7 feed inlet of pelletizer.
Temperature is 155 DEG C in the level-one evaporator 61 of the triple effect evaporator, and interior pressure is 0.3MpaG；Dual evaporation
Temperature is 120 DEG C in device 63, and interior pressure is 0.02MpaG；In three-level evaporator 65 temperature be 80 DEG C, interior pressure be-
0.085MpaG。
This method further includes vent gas treatment, and tiny, the calcium nitrate that the tail gas that pelletizer 7 is discharged is contained into about 2~5g/Nm3
Tail gas generated in pelletizer 7 is passed through an exhaust scrubber that water is housed using the property that calcium nitrate is soluble easily in water by grain
It is interior, using some vapor condensate liquid in second level, three-level evaporator as cleaning solution, by pumping the cleaning solution made in exhaust scrubber
It is recycled, in spray to exhaust scrubber, after the nitric acid calcium concentration to wash tail gas, and in sink reaches certain numerical value
Solution is imported triple effect evaporator and is concentrated by evaporation recycling by (less than 68%).
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of four water-calcium nitrate fertilizer production system, it is characterised in that：Including be sequentially connected in series by pipeline acidolysis slot (2),
Neutralization chamber (3), multistage press filtration unit (4), preheating unit, multiple-effect evaporation unit and pelletizing unit；
The pelletizing unit includes roller pelletizer (7), and the dehumidifying of dry cold air can be conveyed into it by being granulated cavity and one
Machine (72) connection, discharge port (703) lower section of the pelletizer (7), which is equipped with one, can isolate the screening machine of size conforming particle
(8), the screening machine (8) includes conforming particle discharge port (802), bulky grain discharge port (801) and little particle discharge port
(803), the bulky grain discharge port (801) connect with a crusher (83), the little particle discharge port (803) and a pelletizer
(7) feed inlet connection, the conforming particle discharge port (802) connect with baling press.
2. a kind of four water-calcium nitrate fertilizer production system according to claim 1, it is characterised in that：The system further includes stone
Lime stone can be sent into acidolysis slot by lime stone storage hopper (1) and infeed conveyor below, the limestone storage bucket (1)
(2) in.
3. a kind of four water-calcium nitrate fertilizer production system according to claim 1, it is characterised in that：The neutralization chamber (3)
It is connected to a milk of lime delivery pipe.
4. a kind of four water-calcium nitrate fertilizer production system according to claim 1, it is characterised in that：The multistage filters pressing list
First (4) include the level-one pressure filter being sequentially connected in series, level-one storage tank, second level pressure filter and second level storage tank, the level-one filters pressing
The pipeline between pipeline and level-one storage tank and second level pressure filter between device and neutralization chamber (3) is in series with a filtrate pump
(45)。
5. a kind of four water-calcium nitrate fertilizer production system according to claim 1, it is characterised in that：The preheating unit packet
Include the level-one preheater (51) and second level preheater (52) being sequentially connected in series.
6. a kind of four water-calcium nitrate fertilizer production system according to claim 1, it is characterised in that：The pelletizing unit is also
Including water, and tail to the exhaust scrubber (9) being connected to, are filled in the exhaust scrubber (9) with pelletizer offgas duct (704)
Gas washing device tail end is equipped with an exhaust tube (91) straight up.
7. a kind of four water-calcium nitrate production method, including four water-calcium nitrate fertilizer production described in any one of claims 1-6 system
System, it is characterised in that：Including
S1 prepares slurry, including with excessive dilute nitric acid dissolution solid lime stone, until nitric acid ratio reaches in dissolved solution
4%, obtain crude calcium nitrate solution；
Calcium hydroxide is added into crude calcium nitrate solution in S11, until solution pH value is made to reach 7；
S2 is concentrated by evaporation, and calcium nitrate solution obtained in S1 is concentrated by evaporation by triple effect evaporator, and after triple effect evaporation
To nitric acid concentrated calcium solution in nitric acid calcium concentration be 68%；
S3 is granulated, and the nitric acid concentrated calcium solution in S2 is passed through in the slurry inlet of pelletizer (7), and is passed through in pelletizer (7)
The temperature of nitric acid concentrated calcium solution is down to 45 ° by dry cold air.
8. a kind of four water-calcium nitrate production method according to claim 7, it is characterised in that：It further include S12, to institute in S1
It obtains the solution multistage filtering that PH is 7 and obtains calcium nitrate clarified solution.
9. a kind of four water-calcium nitrate production method according to claim 7, it is characterised in that：It further include S21, to clarification
Liquid preheats clarified solution before carrying out multiple-effect evaporation twice, and solution is warming up to 85 ° from 75 ° by preheating for the first time, and second
Solution is warming up to 95 ° from 85 ° by preheating.
10. a kind of four water-calcium nitrate production method according to claim 7, it is characterised in that：It further include S31 screening, it will
Resulting particle is sieved, and the particle by particle diameter less than 2mm and greater than 4mm crushes returning charge to pelletizer (7) feed inlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811150250.8A CN108862354A (en) | 2018-09-29 | 2018-09-29 | A kind of four water-calcium nitrate fertilizer production system and production technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811150250.8A CN108862354A (en) | 2018-09-29 | 2018-09-29 | A kind of four water-calcium nitrate fertilizer production system and production technology |
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| Publication Number | Publication Date |
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| CN108862354A true CN108862354A (en) | 2018-11-23 |
Family
ID=64324962
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001083374A2 (en) * | 2000-05-03 | 2001-11-08 | Omnia Fertilizer Limited | Method for producing calcium nitrate granules |
| JP2002229274A (en) * | 2001-02-06 | 2002-08-14 | Ricoh Co Ltd | Electrophotographic carrier, method and device for manufacturing the same |
| CN103936466A (en) * | 2014-04-29 | 2014-07-23 | 天脊煤化工集团股份有限公司 | Method and device for producing calcium ammonium nitrate |
| CN204211660U (en) * | 2014-11-09 | 2015-03-18 | 山东乐义生物工程科技有限公司 | High nitrogen potassium sulfate production of compound fertilizer tablets press |
| CN207391303U (en) * | 2017-10-18 | 2018-05-22 | 天津华景化工新技术开发有限公司 | A kind of production system of urea nitrophosphate fertilizer product |
| CN208776330U (en) * | 2018-09-29 | 2019-04-23 | 天津华景化工新技术开发有限公司 | A kind of four water-calcium nitrate fertilizer production system |
-
2018
- 2018-09-29 CN CN201811150250.8A patent/CN108862354A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001083374A2 (en) * | 2000-05-03 | 2001-11-08 | Omnia Fertilizer Limited | Method for producing calcium nitrate granules |
| JP2002229274A (en) * | 2001-02-06 | 2002-08-14 | Ricoh Co Ltd | Electrophotographic carrier, method and device for manufacturing the same |
| CN103936466A (en) * | 2014-04-29 | 2014-07-23 | 天脊煤化工集团股份有限公司 | Method and device for producing calcium ammonium nitrate |
| CN204211660U (en) * | 2014-11-09 | 2015-03-18 | 山东乐义生物工程科技有限公司 | High nitrogen potassium sulfate production of compound fertilizer tablets press |
| CN207391303U (en) * | 2017-10-18 | 2018-05-22 | 天津华景化工新技术开发有限公司 | A kind of production system of urea nitrophosphate fertilizer product |
| CN208776330U (en) * | 2018-09-29 | 2019-04-23 | 天津华景化工新技术开发有限公司 | A kind of four water-calcium nitrate fertilizer production system |
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