CN100513362C - Method for producing compound mixed fertilizer - Google Patents
Method for producing compound mixed fertilizer Download PDFInfo
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- CN100513362C CN100513362C CNB2005100278785A CN200510027878A CN100513362C CN 100513362 C CN100513362 C CN 100513362C CN B2005100278785 A CNB2005100278785 A CN B2005100278785A CN 200510027878 A CN200510027878 A CN 200510027878A CN 100513362 C CN100513362 C CN 100513362C
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Abstract
The process of producing compound mixed fertilizer includes the steps of metering basic fertilizers, mixing, pelletizing, drying, sieving, sieving, cooling and packing. The production process features that the sieved large fertilizer grains are heated to form suspended fertilizer slurry, rather than crushed, before being returned to the pelletizing step for further pelletizing together with other basic fertilizers. The present invention results in obviously improved production environment and raised fertilizer product quality.
Description
Technical field
The present invention relates to a kind of production method of composite fertilizer, specifically, relate to a kind of improving one's methods traditional granulating method production composite fertilizer technology.
Background technology
At present; typical granulating method complex fertilizer production method is to contain the base fertilizer raw material of nitrogen phosphorus potassium after mixing; send into the rotary drum granulator granulation, the material after the granulation is directly delivered to drying kiln for drying, and dried material promptly gets qualified product through cooling, screening.
In this method, material need be through screening after the granulation, the qualified fertilizer particle that reaches certain particle diameter can be used as the packing of product, directly returns granulating working procedure as returning charge less than the particle of qualified fertilizer particle diameter, and must just can return granulating working procedure through fragmentation greater than the fertilizer macrobead of qualified fertilizer particle diameter.One of and there is following shortcoming in the macrobead fragmentation:, because oarse-grained Mechanical Crushing lacks effective equipment, crushing effect is bad, material fineness after the fragmentation is not enough, cause large quantities of returning charges at system's internal recycle, and some enters finished product through the macrobead of fragmentation through after the systemic circulation slightly probably, because the general rounding not too of these particles, therefore influences the outward appearance of product; Two, the cleaning of crusher is often more loaded down with trivial details, wastes a large amount of manpowers, even can cause parking, influences system stability; Three, dust that crusher produces and noise are difficult for handling, and cause the workshop to pollute, it is healthy to have influenced the workman.
Summary of the invention
At above-mentioned situation, the invention provides a kind of production method of composite fertilizer, present method adopts heating and melting or the oarse-grained method of heating for dissolving fertilizer, make it to become and be re-used as returning charge behind the fertilizer slurry and turn back to granulating working procedure and continue granulation, got rid of the large-particle fertilizer crushing system, workshop condition is obviously improved.
Most compositions in the composite fertilizer are soluble in water, and, along with the also raising thereupon of its solubleness of rising of temperature.The large-particle fertilizer that goes out the drying machine outlet is easy to be dissolved owing to the temperature height; Moreover the dissolution rate of fertiliser granulates in water is generally all than comparatively fast, and some only needs time of 2～3 minutes; In addition, when several manure saltss coexist, can form the mixture of eutectoid point.Big material in the fertilizer dissolved in dissolving tank or fusion forms in melting channel fertilizer slurry, be delivered to granulation in the tablets press, because the raising of prilling temperature; reduced granulation water; fertilizer slurry has cohesiveness again, makes balling ratio improve, and returning charge reduces.
The present invention realizes like this.The production method of a kind of composite fertilizer of the present invention, production stage comprises that base fertilizer is metered into, mixing, granulation, drying, screening, cooling, packing, it is characterized in that: after the screening, the fertiliser granulates particle diameter is greater than the fertilizer macrobead of qualified fertiliser granulates, be heated as the suspension fertilizers slip, be re-used as returning charge and turn back to granulating working procedure with other solid base fertilizer granulation.
When composite fertilizer was produced, through screening, qualified particle entered cooling, packaging process; Small-particle can directly turn back to tablets press as returning charge and continue granulation; And macroparticle must could continue granulation as returning charge after the fragmentation.According to China GB15063-2001 " composite fertilizer (compound manure) " request of national standard, the particle diameter of qualified fertiliser granulates is 1.00～4.75mm or 3.35～5.60mm.
Method of the present invention is to adopt undersized macroparticle fertilizer is sent into a heat fused device, heating and melting makes it to become fertilizer slurry, the concentration of described fertilizer slurry is 60～99.9 weight %, the concentration of preferred fertilizer slurry is 80～95 weight %, the temperature of described fertilizer slurry is 70～120 ℃, and the temperature of preferred fertilizer slurry is 80～110 ℃.The type of heating of described fertilizer slurry is adopt to feed the steam direct heating or with the mode of steam indirect heating.
Fertilizer slurry, is sprayed onto in base fertilizer, the returning charge of small-particle fertilizer in tablets press by pipe-line transportation, continues granulation.
The addition of described fertilizer slurry accounts for 5～20 weight % of fertilizer total amount, preferred 10～15 weight %.
The inventive method compared with prior art has the following advantages:
1, present method adopts heating and melting or the oarse-grained method of heating for dissolving fertilizer, makes it to become to be re-used as returning charge behind the fertilizer slurry and to turn back to granulating working procedure and continue granulation, has got rid of the large-particle fertilizer crushing system, and workshop condition is obviously improved.
2, fertilizer macroparticle heating and melting is become fertilizer slurry, avoided owing to the big grain of Mechanical Crushing causes the ratio that occurs irregular particles such as semisphere in the product, product appearance is rounding more, same owing to reduced the internal circulating load of macrobead in system, the returning charge of system makes fertilizer output improve about 20% than descending.
3, the fertilizer macrobead need not cooling, has saved the energy, and the slip that macrobead forms returns granulation, can improve prilling temperature, improves balling ratio, adapts to the production of high nitrogen fertilizer (N 〉=20%) especially.
Embodiment
In order to implement the present invention better, the present invention is further illustrated now to enumerate following embodiment, but embodiment is not a limitation of the present invention.
Embodiment 1:
Base fertilizer adds with following quantity respectively, 3.5 tons/hour in urea, 5.0 tons/hour of phosphorus ammoniums, 3.0 tons/hour in Repone K, 1.5 tons/hour of stopping composition kaolin, granulation after mixing, drying, after screening, 8 tons/hour on wherein qualified particle enters packaging process; 4 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 1 ton/hour of macroparticle enters fusion tank, adds 0.2 ton/hour of entry, adopts the fusion of steam indirect heating, becomes fertilizer slurry, and pulp density is 83.3 weight %, and the temperature of fertilizer slurry is 90 ℃.Fertilizer slurry is turned back to granulating working procedure with 1.2 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 2:
Base fertilizer adds with following quantity respectively, 1.5 tons/hour in urea, 1.5 tons/hour of phosphorus ammoniums, 1.5 tons/hour in Repone K, 5.5 tons/hour of stopping composition kaolin, granulation after mixing, drying, after screening, 5 tons/hour on wherein qualified particle enters packaging process; 3 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 2 tons/hour of macroparticles enter fusion tank, add 1.3 tons/hour of entry, adopt the fusion of steam indirect heating, become fertilizer slurry, and pulp density is 60 weight %, and the temperature of fertilizer slurry is 80 ℃.Fertilizer slurry is turned back to granulating working procedure with 3.3 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 3:
Base fertilizer adds with following quantity respectively, 5.0 tons/hour in urea, 2.0 tons/hour of double superhosphate, 2.0 tons/hour of vitriolate of tartar, 1.0 tons/hour of wilkinites, granulation after mixing, drying, screening, 1.1 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 3.9 tons/hour of macroparticles enter fusion tank, add 0.02 ton/hour of entry, adopt the fusion of steam indirect heating, become fertilizer slurry, and pulp density is 99.9 weight %, and the temperature of fertilizer slurry is 110 ℃.Fertilizer slurry is turned back to granulating working procedure with 3.92 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 4:
Base fertilizer adds with following quantity respectively, 3.0 tons/hour in urea, 2.5 tons/hour of general calcium, 2.5 tons/hour of vitriolate of tartar, 2.0 tons/hour of stopping composition clays, granulation after mixing, drying, screening, 2.5 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 2.5 tons/hour of macroparticles enter fusion tank, add 0.6 ton/hour of entry, adopt the fusion of steam indirect heating, become fertilizer slurry, and pulp density is 80 weight %, and the temperature of fertilizer slurry is 70 ℃.Fertilizer slurry is turned back to granulating working procedure with 3.1 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 5:
Base fertilizer adds with following quantity respectively, 4.5 tons/hour of ammonium chlorides, 2.5 tons/hour of general calcium, 0.5 ton/hour of phosphorus ammonium, 1.5 tons/hour in Repone K, 1.5 tons/hour of stopping composition kaolin, granulation after mixing, drying, screening, 3.5 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 1.5 tons/hour of macroparticles enter fusion tank, add 0.07 ton/hour of entry, adopt the fusion of steam indirect heating, become fertilizer slurry, and pulp density is 95 weight %, and the temperature of fertilizer slurry is 120 ℃.Fertilizer slurry is turned back to granulating working procedure with 1.57 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 6:
Base fertilizer adds with following quantity respectively, 2.0 tons/hour in urea, 3.0 tons/hour of phosphorus ammoniums, 2.0 tons/hour in Repone K, 3.0 tons/hour of stopping composition kaolin, granulation after mixing, drying, screening, 2 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 1.5 tons/hour of macroparticles enter fusion tank, adopt the fusion of steam direct heating, and control fertilizer slurry concentration is 65 weight %, and the temperature of fertilizer slurry is 100 ℃.Fertilizer slurry is turned back to granulating working procedure with 2.3 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 7:
Base fertilizer adds with following quantity respectively, 2.5 tons/hour in urea, 2.0 tons/hour of phosphorus ammoniums, 3.0 tons/hour in Repone K, 2.5 tons/hour of stopping composition kaolin, granulation after mixing, drying, screening, 3 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 2 tons/hour of macroparticles enter fusion tank, and 2 adopt the fusion of steam direct heating, and control fertilizer slurry concentration is 74 weight %, and the temperature of fertilizer slurry is 95 ℃.Fertilizer slurry is turned back to granulating working procedure with 2.7 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Embodiment 8:
Base fertilizer adds with following quantity respectively, 4.0 tons/hour in urea, 2.0 tons/hour of phosphorus ammoniums, 3.5 tons/hour in Repone K, 0.5 ton/hour of stopping composition kaolin, granulation after mixing, drying, screening, 2 tons/hour of small-particles directly turn back to granulating working procedure and continue granulation; 3 tons/hour of macroparticles enter fusion tank, add 0.3 ton/hour of entry, adopt the fusion of steam indirect heating, become fertilizer slurry, and pulp density is 90 weight %, and the temperature of fertilizer slurry is 105 ℃.Fertilizer slurry is turned back to granulating working procedure with 3.3 tons/hour amount, be sprayed at other solid fertilizer surface in the tablets press, continue granulation.
Claims (5)
1, a kind of production method of composite fertilizer, production stage comprises that base fertilizer is metered into, mixing, granulation, drying, screening, cooling, packing, it is characterized in that: after the screening, the fertiliser granulates particle diameter is greater than the fertilizer macrobead of qualified fertiliser granulates, be heated as the suspension fertilizers slip, be re-used as returning charge and turn back to granulating working procedure with other solid base fertilizer granulation, the concentration of described fertilizer slurry is 60～99.9 weight %, temperature is 70～120 ℃, and the addition of fertilizer slurry accounts for 5～20 weight % of fertilizer total amount.
2, the method for claim 1 is characterized in that: the concentration of described fertilizer slurry is 80～95 weight %.
3, the method for claim 1 is characterized in that: the temperature of described fertilizer slurry is 80～110 ℃.
4, the method for claim 1 is characterized in that: the addition of described fertilizer slurry accounts for 10～15 weight % of fertilizer total amount.
5, the method for claim 1 is characterized in that: the type of heating of described fertilizer slurry is adopt to feed the steam direct heating or with the mode of steam indirect heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100278785A CN100513362C (en) | 2005-07-19 | 2005-07-19 | Method for producing compound mixed fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100278785A CN100513362C (en) | 2005-07-19 | 2005-07-19 | Method for producing compound mixed fertilizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1900026A CN1900026A (en) | 2007-01-24 |
| CN100513362C true CN100513362C (en) | 2009-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100278785A Expired - Fee Related CN100513362C (en) | 2005-07-19 | 2005-07-19 | Method for producing compound mixed fertilizer |
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| Country | Link |
|---|---|
| CN (1) | CN100513362C (en) |
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- 2005-07-19 CN CNB2005100278785A patent/CN100513362C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1900026A (en) | 2007-01-24 |
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