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Method for reducing agglomeration and pulverization of compound fertilizer and compound fertilizer
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A compound fertilizer and agglomeration technology, applied in the direction of urea compound fertilizer, inorganic fertilizer, fertilizer mixture, etc., can solve the problems of reducing compound fertilizer agglomeration and pulverization
Inactive Publication Date: 2018-05-08
SHENZHEN BATIAN ECOTYPIC ENG
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[0004] The main purpose of the present invention is to provide a method for reducing the agglomeration and pulverization of compound fertilizers and the fertilizer prepared in the granulation process, aiming at reducing the problems of agglomeration and pulverization of fertilizers in the granulation process
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Embodiment 1
[0028] S00, calculation and acquisition of raw materials: According to the nominal 16-16-16 of N-P-K content, obtain urea, superphosphate and potassiumsulfate raw materials required for 100kg fertilizer preparation, and 5kg (5% of fertilizer weight) alkali lignin (pH is 9.8 , It is required to pass through 80 mesh sieve to remove the sieve residue);
[0029] S10, slurry preparation: heat and melt solidurea to form a molten liquid, then add the corresponding mixture of potassiumsulfate, alkali lignin and necessary additives to the molten liquid, and then add the corresponding superphosphate after the material is evenly melted to prepare into a mixed slurry;
[0030] S20, sending the mixed slurry into a high-tower granulator for spraying and granulation, spraying the granulated material entering the granulation tower through the granulator, and collecting the granular material falling into the bottom of the tower;
[0031] S30, cooling the dried, screened and surface-treated...
Embodiment 2
[0036] S00, calculation and acquisition of raw materials: According to the nominal 16-16-16 of N-P-K content, obtain urea, superphosphate and potassiumsulfate raw materials required for 100kg fertilizer preparation, and 5kg (5% of fertilizer weight) ammoniated alkali lignin (alkali Ammonia product of lignin treated with ammonia water or ammonium sulfate, molecular weight 20,000-50,000, pH 10.8, 100-mesh sieve, removal of sieve residue, water content less than 10%, organic matter content ≥ 50%, insoluble matter ≤ 5%);
[0037] S20, sending the mixed slurry into a granulator for spraying and granulation, spraying the granulated material entering the granulation tower through the granulator, and collecting the granular material falling into the bottom of the tower;
[0038] S30, cooling the dried, screened and surface-treated compound fertilizer granules to about 45° C., and bagging them.
[0039] S40, according to the detection standards and methods of compound fertilizer caki...
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Abstract
The invention discloses a method for reducing agglomeration and pulverization of a compound fertilizer and the compound fertilizer prepared by the method. The method comprises the steps that after compound fertilizer raw materials are melted, and alkali lignin or an alkali lignin derivative is added to prepare a mixture slurry; the mixture slurry is used by a granulator to conduct spraying granulation. By adopting the method for reducing the agglomeration and the pulverization of the compound fertilizer, the pH of the compound fertilizer can be effectively adjusted by substituting the alkali lignin or the alkali lignin derivative for commonly used basic ammonium salts and phosphates in granulation process; simultaneously the alkali lignin has very strong hygroscopicity, which can adsorb free water produced by chemical reactions so as to reduce water content in products; the alkali lignin can effectively increase the strength of product granules after cooling and solidification, therebyeffectively solving the problems of the agglomeration and the pulverization of the compound fertilizer during granulation.
Description
technical field [0001] The invention relates to the technical field of preparation of granulated fertilizers, in particular to a method for reducing the agglomeration and pulverization of compound fertilizers and fertilizers. Background technique [0002] The domestic compound fertilizer granulation process generally includes the following types: steam granulation granulation process, urinespray granulation process, acid granulation process or high-towerspray granulation process. It is a fertilizer with relatively strong hygroscopicity and agglomeration such as urea, methyl, and nitro. The surface of the particles is easily wetted by water and recrystallized. The crystal bridge between the particles is very easy to connect. A concave liquid surface is formed between the particles. Due to the existence of additional pressure, the pressure under the concave liquid surface is lower than the external pressure, resulting in capillary adhesion of the fertilizer particles, and be...
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