CN1715257A - A dry powder type organic compound fertilizer granulation binder and preparation method thereof - Google Patents

Abstract

The present invention provides a dry powder type adhesive for pelletizing organic compound fertilizer and its preparation process. The adhesive has material comprising starch 100-200 weight portions, hydrogen peroxide solution 2-6 weight portions, strong alkali 6-12 weight portions, iron salt 1-3 weight portions, borax 4-10 weight portions, urea 2-6 weight portions and sodium silicate 4-6 weight portions. The preparation process includes the following steps: preparing materials; spraying strong alkali solution into starch and stirring; spraying hydrogen peroxide solution and iron salt solution to the mixture and adding borax to the mixture; spraying urea and sodium silicate to the mixture while stirring; reacting the mixture at 60-80 deg c in stove for 1.5-2.5 hr and stoving at 100-110 deg.c; crushing the mixture and 60-100 mesh sieving to obtain the dry powder type adhesive.

Description

A dry powder type organic compound fertilizer granulation binder and preparation method thereof

technical field

The invention relates to a dry powder binder and a preparation method thereof, in particular to a dry powder binder for organic compound fertilizer granulation and a preparation method thereof.

Background technique

The production of compound fertilizer is an important symbol of technological progress in the chemical fertilizer industry, and it is also one of the necessary measures to realize agricultural modernization. The biggest problem in the production of organic compound fertilizers is granulation. Only granular fertilizers are conducive to mechanized fertilization, but if you want to make round granules, you must add a binder. In the past, the binder used for the granulation of organic compound fertilizers was mainly made of inorganic clay minerals or organically synthesized high polymers. Granular organic compound fertilizer with high return rate. The latter has a high cost and is not easy to degrade, and is easy to remain in the soil environment, which will adversely affect the growth of crops. Therefore, a kind of novel organic compound fertilizer granulation binding agent is urgently needed to make up for the deficiency of the above-mentioned binding agent.

Contents of the invention

The object of the present invention is to provide a dry powder type binder for granulating organic compound fertilizer.

Dry powder type organic compound fertilizer granulation binding agent provided by the present invention, its raw material is the material of following weight and number ratio:

Starch (over 100 mesh) 100-200

Hydrogen peroxide (30%) 2-6

Strong base (purity ≥ 96%) 6-12

Iron salt (purity ≥ 90%) 1-3

Borax (purity ≥ 98%) 4-10

Urea (purity ≥ 95%) 2-6

Sodium silicate (purity ≥ 98%) 4-6.

Preferred dry powder type organic compound fertilizer granulation binding agent, its raw material is the material of following weight and number ratio:

Starch (over 100 mesh) 120

Hydrogen peroxide (30%) 4

Strong base (purity ≥ 96%) 6

Iron salt (purity ≥ 90%) 1.5

Borax (purity ≥ 98%) 6

Urea (purity ≥ 95%) 3

Sodium silicate (purity ≥ 98%) 5.

Described strong base can be any one or several in strong bases such as sodium hydroxide, potassium hydroxide, sodium oxide, potassium oxide and ammonium hydroxide; Described iron salt can be ferrous sulfate, ferric sulfate, chloride Any one or more of ferrous and ferric chloride.

The second object of the present invention is to provide a method for preparing the dry powder type organic compound fertilizer granulation binder.

The preparation method provided by the present invention comprises the following steps:

1) Preparation of raw materials: starch (over 100 mesh), hydrogen peroxide (30%) with a ratio of parts by weight of 100-200: 2-6: 6-12: 1-3: 4-10: 2-6: 4-6 , strong alkali (purity ≥ 96%), iron salt (purity ≥ 90%), borax (purity ≥ 98%), urea (purity ≥ 95%) and sodium silicate (purity ≥ 98%). Except for borax, solid substances are dissolved in water to form a solution.

2) Spray the strong alkali solution into the starch, mix evenly, and keep stirring during the mixing process;

3) Spray hydrogen peroxide evenly into the mixture of step 2), then spray the iron salt solution into the mixture, then mix borax into the mixture and stir evenly;

4) After the mixture in step 3) is stirred evenly, the mixed solution of urea and sodium silicate is sprayed into the mixture, and the adding process is continuously stirred;

5) Place the mixture obtained in step 4) in an oven at 60-80°C for 1.5-2.5 hours, then heat up to 100-110°C for drying;

6) The mixture obtained in step 5) is pulverized and passed through a 60-100 mesh sieve to obtain a dry powder type organic compound fertilizer granulation binder.

In the above preparation method, the preferred ratio of parts by weight of starch, hydrogen peroxide, strong alkali, iron salt, borax, urea and sodium silicate is 120:4:6:1.5:6:3:5.

In order to fully react, the strong base, iron salt, urea and sodium silicate are made into a solution before adding, and then added by spraying.

Step 2) the concentration of the strong base solution is 35%-45%, preferably 40%, and its spraying process is preferably controlled within 2-3 minutes to complete; the strong base can be sodium hydroxide, potassium hydroxide, Any one or more of strong bases such as sodium oxide, potassium oxide and ammonium hydroxide.

The concentration of iron salt in step 3) is 15%-25%, preferably 20%, and described iron salt can be any one or more in ferrous sulfate, ferric sulfate, ferrous chloride and ferric chloride; Borax After passing through a 60-mesh sieve or preparing a solution with a concentration of 18%-23%, it is mixed in again, and the concentration of the borax solution is preferably 20%.

The concentration of urea in step 4) is 35%-45%, preferably 40%, and the concentration of sodium silicate solution is 25%-35%, preferably 30%.

The reaction temperature in step 5) is preferably 80°C, the reaction time is preferably 2.0h, and the drying temperature is preferably 105°C.

The diameter of the sieve hole in step 6) is preferably 80 mesh.

The physical and chemical properties of the dry powder type organic compound fertilizer granulation binder of the present invention are:

1) Color and shape: light yellow solid powder;

2) Viscosity of 20% aqueous solution: 98.3mPa·s (rotational viscometer, 25°C);

3) pH value (binder: water=1:10 (ratio by weight and number)): 9.4;

4) Storage period: more than 6 months;

5) The average crush resistance of organic compound fertilizer particles: greater than 13N;

6) Organic compound fertilizer granulation return rate: less than 4.65%;

7) Particle content of organic compound fertilizer with a particle size of 1-6mm: greater than 90%.

8) The ratio of binder to material: 0.8%-1.5%

The above percentage concentrations are mass percentage concentrations.

The present invention uses natural starch as the main material, and uses chemical means to modify the granulated adhesive material produced by granulating organic compound fertilizer, which can be widely used in agglomeration granulation and extrusion granulation . The organic compound fertilizer granulation binder of the present invention has the advantages of non-toxic, harmless, non-polluting, easy to degrade and easily soluble in water, and is suitable for the production of N, P, K with an effective content of more than 30% and an organic matter content of 50%. The round granule organic compound fertilizer with more than 100% is also suitable for granulation of high concentration organic-inorganic compound fertilizer (N, P, K effective nutrient ≥ 35%). The binder also has the advantages of less dosage, biodegradability, no risk of environmental pollution, convenient storage and transportation, and can simplify the granulation process, good pelleting effect, low return rate, etc., which can increase the total nutrient content of fertilizers , so that the fertilizer meets or exceeds the standard of compound fertilizer, and at the same time, the nutrient elements necessary for crops are transformed and used as binder components, which can not only increase the effectiveness of nutrient elements, but also simplify the production process of granular compound fertilizer The binder of the present invention is a dry powder type, and the addition method is flexible. When granulating, it can be dissolved in water and used in a spray mode, or it can be directly mixed, that is, it is mixed with the materials at the same time. It can be added in sections, so it is suitable for drum granulator and disc granulator or extrusion granulation. The granulation method is simple and suitable for industrial production.

Detailed ways

The methods used in the following examples are conventional methods unless otherwise specified.

Embodiment 1, Preparation of 1 ton of dry powder type organic compound fertilizer granulation binder

The organic compound fertilizer granulation binder of the present embodiment contains starch, hydrogen peroxide, sodium hydroxide, ferrous sulfate, borax, urea and silicon with a weight fraction ratio of 100:4:6:1:4:4:5. Sodium acid. Concrete preparation process comprises the following steps:

1. Prepare materials

Weigh the raw materials according to the above weight fraction ratio. Sodium hydroxide is prepared into a 40% aqueous solution; borax is prepared into a 20% aqueous solution with hot water; after urea is prepared into a 40% aqueous solution, sodium silicate is dissolved in and mixed to make a mixed solution; Iron formulated as a 20% aqueous solution.

2. Mixing

Put the weighed starch in the reactor, turn on the agitator, spray the sodium hydroxide solution evenly with a sprayer, and the whole operation is completed within 2-3 minutes; then spray the hydrogen peroxide quickly and evenly on the starch; finally The mixed solution of ferrous sulfate solution, borax solution, urea and sodium silicate is evenly added into the reactor in turn, and all the above operations are carried out under stirring.

3. Oxidation reaction and drying

Spread the mixture obtained in step 2 flat on a drying tray, then place the tray in a constant temperature blast drying oven at 80°C for 2 hours (the blast is not turned on during this process), then adjust the oven to 105°C, and dry the mixture Dry (this process turns on the blower to blow air).

4. Crushing

The mixture obtained in step 3 is crushed with a pulverizer, passed through an 80-mesh sieve, and bagged to obtain a dry powder organic compound fertilizer granulation binder.

After testing, the physical and chemical properties of the prepared dry powder type organic compound fertilizer granulation binder are:

1) Color and shape: light yellow solid powder;

2) Viscosity of 20% aqueous solution: 98.6mPa·s (rotational viscometer, 25°C);

3) pH value (binder: water=1:10 (ratio by weight and number)): 9.4;

4) Storage period: more than 6 months;

5) The average crush resistance of organic compound fertilizer particles: greater than 14N (the national standard is >6N);

6) Organic compound fertilizer granulation return rate: less than 4%;

7) Particle content of organic compound fertilizer with a particle size of 1-6mm: greater than 90%.

8) The ratio of binder to material: 0.8%-1.5%

Embodiment 2, Preparation of 1 ton of dry powder type organic compound fertilizer granulation binder

The organic compound fertilizer granulation binder of the present embodiment comprises starch, hydrogen peroxide, sodium hydroxide, ferrous sulfate, borax, urea and silicon with a weight fraction ratio of 150:5:10:1.5:8:6:6. Sodium acid. Concrete preparation process comprises the following steps:

1. Prepare materials

Weigh the raw materials according to the above weight fraction ratio. Sodium hydroxide is prepared into a 40% aqueous solution; borax is prepared into a 20% aqueous solution with hot water; after urea is prepared into a 40% aqueous solution, sodium silicate is dissolved in and mixed to make a mixed solution; Iron formulated as a 20% aqueous solution.

2. Mixing

Put the weighed starch in the reactor, turn on the agitator, spray the sodium hydroxide solution evenly with a sprayer, and the whole operation is completed within 2-3 minutes; then spray the hydrogen peroxide quickly and evenly on the starch; finally The mixed solution of ferrous sulfate solution, borax solution, urea and sodium silicate is evenly added into the reactor in turn, and all the above operations are carried out under stirring.

3. Oxidation reaction and drying

Spread the mixture obtained in step 2 flat on a drying tray, then place the tray in a constant temperature blast drying oven at 80°C for 2 hours (the blast is not turned on during this process), then adjust the oven to 105°C, and dry the mixture Dry (this process turns on the blower to blow air).

4. Crushing

The mixture obtained in step 3 is crushed with a pulverizer, passed through an 80-mesh sieve, and bagged to obtain a dry powder organic compound fertilizer granulation binder.

After testing, the physical and chemical properties of the prepared dry powder type organic compound fertilizer granulation binder are:

1) Color and shape: light yellow solid powder;

2) Viscosity of 20% aqueous solution: 102.7mPa·s (rotational viscometer, 25°C);

3) pH value (binder: water=1:10 (ratio by weight)): 9.8;

4) Storage period: more than 6 months;

5) The average crush resistance of organic compound fertilizer particles: greater than 14N (the national standard is >6N);

6) Organic compound fertilizer granulation return rate: 4.1%;

7) Particle content of organic compound fertilizer with a particle size of 1-6mm: greater than 90%.

8) The ratio of binder to material: 0.8%-1.5%

Example 3, Preparation of 1 ton of dry powder type organic compound fertilizer granulation binder

The organic compound fertilizer granulation binder of the present embodiment contains starch, hydrogen peroxide, sodium hydroxide, ferrous sulfate, borax, urea and silicon with a weight fraction ratio of 200:6:12:2:8:6:4. Sodium acid. Concrete preparation process comprises the following steps:

1. Prepare materials

Weigh the raw materials according to the above weight fraction ratio. Sodium hydroxide is prepared into a 40% aqueous solution; borax is prepared into a 20% aqueous solution with hot water; after urea is prepared into a 40% aqueous solution, sodium silicate is dissolved in and mixed to make a mixed solution; Iron formulated as a 20% aqueous solution.

2. Mixing

Put the weighed starch in the reactor, turn on the agitator, spray the sodium hydroxide solution evenly with a sprayer, and the whole operation is completed within 2-3 minutes; then spray the hydrogen peroxide quickly and evenly on the starch; finally The mixed solution of ferrous sulfate solution, borax solution, urea and sodium silicate is evenly added into the reactor in turn, and all the above operations are carried out under stirring.

3. Oxidation reaction and drying

Spread the mixture obtained in step 2 flat on a drying tray, then place the tray in a constant temperature blast drying oven at 80°C for 2 hours (the blast is not turned on during this process), then adjust the oven to 105°C, and dry the mixture Dry (this process turns on the blower to blow air).

4. Crushing

The mixture obtained in step 3 is pulverized with a pulverizer, passed through a 60-mesh sieve, and bagged to obtain a dry powder organic compound fertilizer granulation binder.

After testing, the physical and chemical properties of the prepared dry powder type organic compound fertilizer granulation binder are:

1) Color and shape: light yellow solid powder;

2) Viscosity of 20% aqueous solution: 112.8mPa·s (rotational viscometer, 25°C);

3) pH value (binder: water=1:10 (ratio by weight)): 9.1;

4) Storage period: more than 6 months;

5) The average crush resistance of organic compound fertilizer particles: greater than 14N (the national standard is >6N);

6) Organic compound fertilizer granulation return rate: 3.1%;

7) Particle content of organic compound fertilizer with a particle size of 1-6mm: greater than 90%.

Embodiment 4, granulation test

The dry powder type organic compound fertilizer granulation binding agent that above-mentioned embodiment prepares is carried out granulation test with conventional method, and the result shows that when binding agent consumption accounts for 1.38% of total mass, the particle size in the organic compound fertilizer particle is greater than The particle content of 1mm accounts for 93.07% of the total material, and the particle content of the particle size between 1-6mm accounts for 95.0% of the total particle size larger than 1mm. And the average compressive strength of the particles is greater than or equal to 14N.

Claims (9)

1, a kind of dry powder type organic compound fertilizer granulation binding agent, its raw material is the material of following weight and number ratio:                                                                     Hydrogen peroxide 2-6                                                                                                                                                                                                                                     Borax 4-10 Urea 2-6 Sodium silicate 4-6. 2. The dry powder type organic compound fertilizer granulation binder according to claim 1, characterized in that: the dry powder type organic compound fertilizer granulation binder has the following raw materials in the following parts by weight ratio: substance: Starch 120 Hydrogen peroxide 4 Strong base 6                                                                                                                                                                                                  Sodium silicate 5. 3. The dry powder type organic compound fertilizer granulation binder according to claim 1 or 2, characterized in that: the mass percent concentration of the hydrogen peroxide is 30%; the strong base is sodium hydroxide, hydroxide Any one or more of potassium, sodium oxide, potassium oxide and ammonium hydroxide; the iron salt is any one or more of ferrous sulfate, ferric sulfate, ferrous chloride and ferric chloride. 4. A method for preparing the dry powder type organic compound fertilizer granulation binder according to claim 1, comprising the following steps: 1) Raw material preparation: starch, hydrogen peroxide, strong alkali, iron salt, borax, Urea and Sodium Silicate. In addition to borax, solid substances are dissolved in water to form a solution; 2) Spray the strong alkali solution into the starch, mix evenly, and keep stirring during the mixing process; 3) Spray hydrogen peroxide evenly into the mixture of step 2), then spray the iron salt solution into the mixture, then mix borax into the mixture and stir evenly; 4) After the mixture in step 3) is stirred evenly, the mixed solution of urea and sodium silicate is sprayed into the mixture, and the adding process is continuously stirred; 5) Place the mixture obtained in step 4) in an oven at 60-80°C for 1.5-2.5 hours, then heat up to 100-110°C for drying; 6) The mixture obtained in step 5) is pulverized and passed through a 60-100 mesh sieve to obtain a dry powder type organic compound fertilizer granulation binder. 5. The preparation method according to claim 4, characterized in that the ratio of starch, hydrogen peroxide, strong alkali, iron salt, borax, urea and sodium silicate in parts by weight is 120:4:6:1.5:6 :3:5. 6. The preparation method according to claim 4 or 5, characterized in that: the concentration of the strong alkali solution in the step 2) is 35%-45%, and the spraying time is 2-3 minutes; the hydrogen peroxide solution in the step 3) The concentration of urea is 30%, and the concentration of iron salt is 15%-25%, and borax crosses 60 mesh sieves or is made into the solution that concentration is 18%-23% and then mixes in again; Step 4) the concentration of urea is 35%-45% %, the concentration of sodium silicate solution is 25%-35%. 7. The preparation method according to claim 6, characterized in that: the concentration of the strong alkali solution in the step 1) is 40%; the concentration of the iron salt in the step 2) is 20%, and the borax passes through a 60-mesh sieve or is made into The solution with a concentration of 20% is mixed in again; the concentration of urea in step 3) is 40%, and the concentration of sodium silicate solution is 30%. 8. The preparation method according to claim 4 or 5, characterized in that: the strong base is any one or more of sodium hydroxide, potassium hydroxide, sodium oxide, potassium oxide and ammonium hydroxide; The salt is any one or more of ferrous sulfate, ferric sulfate, ferrous chloride and ferric chloride; 9. The preparation method according to claim 4 or 5, characterized in that: the reaction temperature in step 4) is 80°C, the reaction time is 2.0h, and the drying temperature is 105°C; the sieve in step 5) The diameter is 80 mesh.