Effervescent water-soluble fertilizer and preparation method thereof

Abstract

The invention relates to an effervescent water-soluble fertilizer and a preparation method thereof, the effervescent water-soluble fertilizer is composed of organic acid and / or acid salt with more than 6 carbon atoms, acid carbonate and a water-soluble fertilizer raw material, and is characterized in that the water-soluble fertilizer raw material does not contain urea, the organic acid and / or acid salt with more than 6 carbon atoms is dissolved in water, and the water-soluble fertilizer raw material contains urea. Or a product obtained after the reaction with the acid carbonate is dissolved in water. The effervescent water-soluble fertilizer is high in dissolving speed, and the problems of pulverization and caking in the storage process of the effervescent water-soluble fertilizer can be effectively solved.

Description

Technical Field

[0001] The invention relates to an effervescent water-soluble fertilizer and a preparation method thereof. Background Art

[0002] Effervescent water-soluble fertilizers can dissolve quickly in water and have the advantage of being easy to use. In order to prevent the product from agglomerating and powdering, the existing method for preparing effervescent granules usually first prepares acid granules or alkaline granules, and a binding material needs to be added when preparing the acid granules and the alkaline granules. A binding material is also added when preparing the effervescent granules. The above-mentioned binding material not only plays a bonding role, but also plays a role of isolation and protection to prevent acid and alkali from chemically reacting during storage. However, commonly used binding materials such as polyethylene glycol have stable chemical properties under general conditions and need to react with oxygen in the air at 120°C or above. What is particularly important is that polyethylene glycol has an osmotic stress effect on plants. Therefore, long-term use may cause accumulation in the soil, thereby affecting the growth of crops.

[0003] There is a market need to develop products and methods that reduce the use of binding materials and can reduce the powdering and agglomeration of effervescent water-soluble fertilizers. Summary of the invention

[0004] The invention provides an effervescent water-soluble fertilizer and a preparation method thereof, which solves the technical problem of reducing the use of bonding materials and can reduce the pulverization and agglomeration of the effervescent water-soluble fertilizer.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An effervescent water-soluble fertilizer, comprising an organic acid and / or acid salt, acid carbonate having a carbon number greater than 6 and a water-soluble fertilizer raw material, wherein the water-soluble fertilizer raw material does not include urea;

[0007] The organic acid and / or acid salt having a carbon number greater than 6 can react with acid carbonate in water to release carbon dioxide;

[0008] The organic acid and / or acid salt having a carbon number greater than 6 is dissolved in water, or

[0009] The product after reaction with acid carbonate is soluble in water;

[0010] The moisture content of the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw material having a carbon number greater than 6 is less than 1%.

[0011] The mass ratio of the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw materials with a carbon number greater than 6 is 6-24:8-30:46-86, and the mass ratio of the organic acid and / or acid salt and acid carbonate with a carbon number greater than 6 is 0.4-2:1.0-1.2, and the pH of the effervescent water-soluble fertilizer is 3.0-6.0; the pH is detected by an aqueous solution with a mass ratio of the effervescent water-soluble fertilizer to water of 1:250.

[0012] The organic acid and / or acid salt having a carbon number greater than 6 is one or both of disodium ethylenediaminetetraacetate and ethylenediaminetetraacetic acid; the acid carbonate is one or more of sodium bicarbonate, ammonium bicarbonate and potassium bicarbonate; the water-soluble fertilizer raw material is one or more of ammonium sulfate, potassium sulfate, potassium polyphosphate, diammonium phosphate and dipotassium phosphate.

[0013] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0014] After mixing the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw material with a carbon number greater than 6, adding a binder, and extruding and granulating, an effervescent water-soluble fertilizer is obtained;

[0015] The bonding liquid is one or more of ethanol, polyethylene glycol ethanol solution and polyvinyl pyrrolidone ethanol solution;

[0016] The mass ratio of the total mass of the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw material with carbon number greater than 6 to the mass ratio of the binding liquid is 1:0.02-0.08.

[0017] The ethanol is an ethanol solution with an ethanol mass fraction greater than 95%; the polyethylene glycol ethanol solution is an ethanol solution with a polyethylene glycol mass concentration of 5 to 12%; and the polyvinyl pyrrolidone ethanol solution is an ethanol solution with a polyvinyl pyrrolidone mass concentration of 5 to 12%.

[0018] The water content of the effervescent water-soluble fertilizer is less than 1%.

[0019] The invention has the following beneficial technical effects:

[0020] 1) The present application selects organic acids and / or acid salts, acid carbonates and water-soluble fertilizer raw materials having a carbon number greater than 6, and the water-soluble fertilizer raw materials do not include urea. Further, the present application also sets requirements for the moisture content of organic acids and / or acid salts, acid carbonates and water-soluble fertilizer raw materials having a carbon number greater than 6, that is, all are less than 1%. The above conditions are set to reduce the use of bonding materials and to reduce the pulverization and agglomeration of effervescent water-soluble fertilizers, and cannot be changed.

[0021] 2) The present application controls the pH of the effervescent water-soluble fertilizer to be 3.0-6.0, which is conducive to the rapid reaction of the effervescent water-soluble fertilizer when used, preventing carbonate and bicarbonate from reacting with calcium and magnesium ions in the water, or the ionized hydroxide of bicarbonate from reacting with dihydrogen phosphate, so that the dihydrogen phosphate becomes phosphate, and the phosphate reacts with calcium and magnesium ions, thereby affecting the use of the water-soluble fertilizer; at the same time, a pH higher than 6.0 will affect the dissolution rate of the effervescent water-soluble fertilizer in water, and a pH lower than 3.0 will not meet the Ministry of Agriculture's pH limit for water-soluble fertilizers, and long-term use will acidify the soil and cause damage to the plant root system.

[0022] 3) The present application limits the moisture content of the effervescent water-soluble fertilizer to less than 1%, which is more conducive to reducing the pulverization and agglomeration of the effervescent water-soluble fertilizer. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below in conjunction with preferred examples.

[0024] Example 1

[0025] An effervescent water-soluble fertilizer is composed of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate in a mass ratio of 4:8:20:49:19.

[0026] The water content of EDTA is 0.3%, the water content of disodium EDTA is 0.9%, the water content of potassium bicarbonate is 0.6%, the water content of potassium dihydrogen phosphate is 0.4%, and the water content of ammonium sulfate is 0.4%.

[0027] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0028] After ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate are mixed, industrial ethanol with a mass concentration of 95% is added in a spraying manner, and the effervescent water-soluble fertilizer is obtained by extrusion granulation;

[0029] The mass ratio of the total mass of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate to 95% industrial ethanol is 1:0.04.

[0030] The moisture content of effervescent water-soluble fertilizer is 0.8%.

[0031] Example 2

[0032] An effervescent water-soluble fertilizer is composed of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate in a mass ratio of 4:8:20:49:19.

[0033] The water content of EDTA is 0.3%, the water content of disodium EDTA is 0.9%, the water content of potassium bicarbonate is 0.6%, the water content of potassium dihydrogen phosphate is 0.4%, and the water content of ammonium sulfate is 0.4%.

[0034] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0035] After ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate are mixed, a polyethylene glycol ethanol solution with a mass concentration of 6% is added in a spraying manner, and the mixture is extruded and granulated to obtain an effervescent water-soluble fertilizer;

[0036] The mass ratio of the total mass of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate to the polyethylene glycol ethanol solution is 1:0.04.

[0037] The moisture content of effervescent water-soluble fertilizer is 0.8%.

[0038] Example 3

[0039] An effervescent water-soluble fertilizer is composed of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate in a mass ratio of 4:8:20:49:19.

[0040] The water content of EDTA is 0.3%, the water content of disodium EDTA is 0.9%, the water content of potassium bicarbonate is 0.6%, the water content of potassium dihydrogen phosphate is 0.4%, and the water content of ammonium sulfate is 0.4%.

[0041] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0042] After ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate are mixed, polyvinyl pyrrolidone K30 ethanol solution with a mass concentration of 6% is added in a spraying manner, and granulated by extrusion to obtain an effervescent water-soluble fertilizer;

[0043] The mass ratio of the total mass of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate to the mass ratio of the polyvinylpyrrolidone K30 ethanol solution is 1:0.04.

[0044] The moisture content of effervescent water-soluble fertilizer is 0.8%.

[0045] Example 4

[0046] An effervescent water-soluble fertilizer is composed of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, sodium bicarbonate, potassium dihydrogen phosphate, potassium sulfate and ammonium sulfate in a mass ratio of 2:13:14:25:20:26.

[0047] The moisture content of EDTA is 0.3%, the moisture content of disodium EDTA is 0.9%, the moisture content of sodium bicarbonate is 0.6%, the moisture content of potassium dihydrogen phosphate is 0.4%, the moisture content of potassium sulfate is 0.6%, and the moisture content of ammonium sulfate is 0.6%.

[0048] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0049] After ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, sodium bicarbonate, potassium dihydrogen phosphate, potassium sulfate and ammonium sulfate are mixed, a polyethylene glycol ethanol solution with a mass concentration of 8% is added in a spraying manner, and an effervescent water-soluble fertilizer is obtained by extrusion granulation;

[0050] The mass ratio of the total mass of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, sodium bicarbonate, potassium dihydrogen phosphate, potassium sulfate and ammonium sulfate to the polyethylene glycol ethanol solution is 1:0.04.

[0051] The moisture content of effervescent water-soluble fertilizer is 0.7%.

[0052] Example 5

[0053] An effervescent water-soluble fertilizer is composed of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, sodium bicarbonate, diammonium dihydrogen phosphate, potassium sulfate and ammonium sulfate in a mass ratio of 1:14:12:3:15:30:25.

[0054] The moisture content of EDTA is 0.3%, the moisture content of disodium EDTA is 0.9%, the moisture content of potassium bicarbonate is 0.5%, the moisture content of sodium bicarbonate is 0.5%, the moisture content of diammonium phosphate is 0.5%, the moisture content of potassium sulfate is 0.5%, and the moisture content of ammonium sulfate is 0.5%.

[0055] The preparation method of effervescent water-soluble fertilizer is carried out according to the following steps:

[0056] Ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, sodium bicarbonate, ammonium dihydrogen phosphate, potassium sulfate and ammonium sulfate are mixed, and polyvinylpyrrolidone K30 ethanol solution with a mass concentration of 8% is added in a spraying manner, and granulated by extrusion to obtain an effervescent water-soluble fertilizer;

[0057] The mass ratio of the total mass of ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate, potassium bicarbonate, potassium dihydrogen phosphate and ammonium sulfate to the mass ratio of the polyvinylpyrrolidone K30 ethanol solution is 1:0.04.

[0058] The moisture content of effervescent water-soluble fertilizer is 0.6%.

[0059] The beneficial effects of the present invention are further illustrated below in conjunction with test data:

[0060] Test materials

[0061] 1.1 Test location: Laboratory of Ban Lao Shi Special Fertilizer Research and Design Institute (Henan) Co., Ltd., laboratory temperature 25℃, humidity 62%.

[0062] 1.2 Experimental testing: Statistical analysis of powdering rate and agglomeration rate;

[0063] 1.3 Test method: The effervescent water-soluble fertilizer (particle size between 2mm-4mm) produced in the experiment is packaged in water-soluble fertilizer packaging bags, 5kg / bag, and stacked 30 bags high in parallel for 2 months. Take the bag at the bottom, and one person holds the water-soluble fertilizer bag with both hands to the chest level, and then lets go, and the fertilizer bag falls freely, once in the front and once in the back, and pours out the water-soluble fertilizer. It is sieved with 2mm and 4mm sieves, and the mass of the water-soluble fertilizer is recorded as m0, the mass greater than 4mm is recorded as m1, and the mass less than 2mm is recorded as m2. The powdering rate (%) = m2 / m0*100%; the caking rate (%) = m1 / m0*100%.

[0064] The experimental settings are as follows: Comparison 1 (except that disodium edetate is replaced by citric acid, all other aspects are consistent with Example 2),

[0065] Contrast 2 (except that disodium edetate is replaced by oxalic acid, the others are all consistent with Example 2), Contrast 3 (except that disodium edetate is replaced by tartaric acid, the others are all consistent with Example 2), Contrast 4 (except that potassium bicarbonate is replaced by potassium carbonate, the others are all consistent with Example 2), Contrast 5 (except that ammonium sulfate is replaced by urea, the others are all consistent with Example 2), Example 1, Example 2, Example 3, Example 4 and Example 5 prepared effervescent water-soluble fertilizer.

[0066] Except for the different processing, the other implementations of this application are consistent.

[0067] 2 Results and analysis

[0068] The results of powderization rate and agglomeration rate, among which the differentiation rate and agglomeration rate are taken as the average value, are shown in Table 1

[0069] Table 1

[0070] Powdering rate (%) Agglomeration rate (%) Comparison 1 7.96 7.16 Comparison 2 8.57 7.69 Contrast 3 8.06 7.51 Contrast 4 3.87 4.23 Contrast 5 9.21 9.87 Example 1 4.25 3.94 Example 2 1.78 1.96 Example 3 1.84 1.95 Example 4 1.76 1.67 Example 5 1.83 1.95

[0071] The carbon number of the citric acid in Comparison 1 is 6, the carbon number of the oxalic acid in Comparison 2 is 2, the carbon number of the tartaric acid in Comparison 3 is 4, and the carbon number of the ethylenediaminetetraacetic acid in Example 2 is 10.

[0072] It can be seen from the data comparison of Comparison 1, Comparison 2, Comparison 3 and Example 2 in Table 1 that Example 2 using ethylenediaminetetraacetic acid having 10 carbon atoms has a good advantage in reducing caking and pulverization, that is, the selection of organic acid will affect the caking of effervescent water-soluble fertilizers.

[0073] From the data comparison of Comparative Example 4 and Example 2, it can be seen that the difference between carbonate and acid carbonate will also affect the agglomeration and pulverization of the effervescent water-soluble fertilizer, among which Example 2 using acid carbonate has a better effect.

[0074] From the data comparison of Comparative 5 and Example 2, it can be seen that the addition of urea directly affects the agglomeration and pulverization of the effervescent water-soluble fertilizer, and Example 2 without adding urea can significantly reduce the agglomeration and pulverization.

[0075] From the data comparison of Examples 1 to 5, it can be seen that the addition of the ethanol solution of polyethylene glycol or polyvinyl pyrrolidone as a bonding substance is more advantageous than the addition of ethanol alone in preventing the effervescent water-soluble fertilizer from pulverizing and agglomerating.

Claims

1. An effervescent water-soluble fertilizer, comprising an organic acid and / or acid salt, acid carbonate having a carbon number greater than 6 and a water-soluble fertilizer raw material, characterized in that: The water-soluble fertilizer raw material does not include urea; The organic acid and / or acid salt having a carbon number greater than 6 can react with acid carbonate in water to release carbon dioxide; The organic acid and / or acid salt having a carbon number greater than 6 is dissolved in water, or The product after reaction with acid carbonate is soluble in water; The moisture content of the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw material having a carbon number greater than 6 is less than 1%.

2. the effervescent water-soluble fertilizer as claimed in claim 1, is characterized in that, The mass ratio of the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw materials with a carbon number greater than 6 is 6-24:8-30:46-86, and the mass ratio of the organic acid and / or acid salt and acid carbonate with a carbon number greater than 6 is 0.4-2:1.0-1.2, and the pH of the effervescent water-soluble fertilizer is 3.0-6.0; the pH is detected by an aqueous solution with a mass ratio of the effervescent water-soluble fertilizer to water of 1:

250.

3. the effervescent water-soluble fertilizer as claimed in claim 1, is characterized in that, The organic acid and / or acid salt having a carbon number greater than 6 is one or both of disodium ethylenediaminetetraacetate and ethylenediaminetetraacetic acid; the acid carbonate is one or more of sodium bicarbonate, ammonium bicarbonate and potassium bicarbonate; the water-soluble fertilizer raw material is one or more of ammonium sulfate, potassium sulfate, potassium polyphosphate, diammonium phosphate and dipotassium phosphate.

4. The preparation method of the effervescent water-soluble fertilizer according to any one of claims 1 to 3, characterized in that Follow the steps below, After mixing the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw material with a carbon number greater than 6, adding a binder, and extruding and granulating, an effervescent water-soluble fertilizer is obtained; The bonding liquid is one or more of ethanol, polyethylene glycol ethanol solution and polyvinyl pyrrolidone ethanol solution; The mass ratio of the total mass of the organic acid and / or acid salt, acid carbonate and water-soluble fertilizer raw material with carbon number greater than 6 to the mass ratio of the binding liquid is 1:0.02-0.

08.

5. the preparation method of effervescent water-soluble fertilizer as claimed in claim 4, is characterized in that, The ethanol is an ethanol solution with an ethanol mass fraction greater than 95%; the polyethylene glycol ethanol solution is an ethanol solution with a polyethylene glycol mass concentration of 5 to 12%; and the polyvinyl pyrrolidone ethanol solution is an ethanol solution with a polyvinyl pyrrolidone mass concentration of 5 to 12%.

6. The preparation method of effervescent water-soluble fertilizer as claimed in claim 5, characterized in that, The water content of the effervescent water-soluble fertilizer is less than 1%.