High-strength compound fertilizer and preparation method thereof

A compound fertilizer and high-strength technology, which is applied in the direction of urea compound fertilizer, potash fertilizer, nitrogen fertilizer, etc., can solve problems such as uneven packaging, difficulty in controlling production costs, and material adhesion, so as to reduce fertilizer caking rate, weaken hygroscopicity, and save energy. cost effect

Active Publication Date: 2022-02-01
中化农业(临沂)研发中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If it is added in the form of outer packaging, it is easy to cause problems such as uneven packaging, material adhesion, and high energy consumption. Higher control is required for the urea-formaldehyde synthetic liquid and the process conditions of the packaging process, making it difficult to control the production cost.
Thereby, existing method for preparing high-strength compound fertilizer still needs to be improved

Method used

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  • High-strength compound fertilizer and preparation method thereof
  • High-strength compound fertilizer and preparation method thereof
  • High-strength compound fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Add 90 kg of urea, 5 kg 60% phosphate, add 0.1 kg of sodium hydroxide, and the reaction temperature is 105 to 115 ° C, forming urea melt low temperature melt solution.

[0044] (2) In the reactor containing 37% formaldehyde solution, 40% concentration of sulfuric acid solution was added, and the solution pH was adjusted to 5 to form an acidic formaldehyde solution.

[0045] (3) In the granulation roller, 5kg of the urea cryogenic melt solution is sprayed into the granulator inner composite fertilizer, and 1 kg of acidic formaldehyde solution is injected, and the reaction is 10 min, and the surface of the fertilizer particle is low. Reactive condensation curing with acidic formaldehyde solution, carry out production of 15-15-15 plain ureadehyde high strength composite fertilizer.

[0046] (4) After the reaction is completed, after drying, cooling, and sieving treatment, the urea is prepared high strength fertilizer.

Embodiment 2

[0048] (1) Add 93 kg of urea, 7 kg 60% phosphate, adding an ammonium of the reaction to the reactor, and 0.3 kg of sodium hydroxide is added, and the reaction temperature is 105 to 115 ° C, and the urea melt is formed low temperature melt solution.

[0049] (2) In the reactor containing 37% formaldehyde solution, 40% concentration of sulfuric acid solution was added, and the solution pH was adjusted to 5 to form an acidic formaldehyde solution.

[0050] (3) In the roller, 10 kg of the urea cryogenic melt solution is sprayed into the combined fertilizer of the granulator, and 1 kg of acidic formaldehyde solution is injected, and the reaction is 10 min, and the surface of the fertilizer particles is low-temperature melt and acidic. The reaction condensation curing of formaldehyde solution is carried out, carry out 15-15-15 plans of ureahandhyde high strength composite fertilizer.

Embodiment 3

[0052] (1) 95 kg of urea, 10 kg 60% phosphate was added to the reactor, and 0.7 kg of sodium hydroxide was added, and the reaction temperature 105 to 115 ° C was added to form urea melt cryogenic molten melt solution.

[0053] (2) In the reactor containing 37% formaldehyde solution, 40% concentration of sulfuric acid solution was added, and the solution pH was adjusted to 5 to form an acidic formaldehyde solution.

[0054] (3) In the roller, 6kg of the above urea cryogenic melt solution is sprayed into the granulator inner composite fertilizer, and 1 kg of acidic formaldehyde solution is injected, and the reaction is 10 min, and the surface of the fertilizer particles is low-temperature melt and acidic. The reaction condensation curing of formaldehyde solution is carried out, carry out 15-15-15 plans of ureahandhyde high strength composite fertilizer.

[0055] (4) After the reaction is completed, after drying, cooling, and sieving treatment, the urea is prepared high strength fert...

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Abstract

The invention discloses a high-strength compound fertilizer and a preparation method thereof. The method for preparing the high-strength compound fertilizer comprises the following steps: (1) respectively preparing a co-melt containing urea and an acidic formaldehyde solution; and (2) supplying the compound fertilizer into granulation equipment, and spraying the urea-containing co-melt and an acidic formaldehyde solution on the surface of the compound fertilizer in a granulation process so as to allow the urea-containing co-melt and the acidic formaldehyde solution to react to generate urea formaldehyde which wraps at least a part of the surface of the compound fertilizer, thereby obtaining the high-strength compound fertilizer. According to the method, urea formaldehyde reaction and external wrapping can be synchronously carried out on the surface of the compound fertilizer in the production process of the compound fertilizer, so the strength of the prepared high-strength compound fertilizer particles can be remarkably improved, the hygroscopicity of the fertilizer is weakened, the caking rate of the fertilizer is reduced, and meanwhile, a certain nitrogen slow-release effect is provided for the fertilizer. In addition, the urea formaldehyde high-strength compound fertilizer prepared by the method does not need to add wrapping oil and / or wrapping powder in production, so cost can be effectively saved.

Description

Technical field [0001] The present invention relates to the field of fertilizers, in particular, the present invention relates to high-strength composite fertilizers and a preparation method thereof. Background technique [0002] Fertilizer cake is the problems that are often encountered during complex fertilizer production and storage, which seriously affects product quality, and affects the promotion and application of compound fertilizer. Fertilizer cake is a complex problem. If the fertilizer ingredient has hygroscopicity, when the moisture content is high, it is easy to repeat crystallization, which is too small, and the amount of wrap powder is too small, and it is also easy to cause adhesion between fertilizer particles. When too high, it is easy to cause slab. At the same time, when the strength of the fertilizer particles is low, it will affect the product effect during transportation and application. [0003] At present, in order to improve the strength of the fertilize...

Claims

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Application Information

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IPC IPC(8): C05G3/30C05G3/40C05G5/12C05G5/30C05G3/00
CPCC05G3/30C05G3/40C05G5/12C05G5/30C05B7/00C05G3/00C05C9/00C05C9/02C05D1/00C05D3/00
Inventor 曲宝龙李同花焦卫平任先顺王子浩
Owner 中化农业(临沂)研发中心有限公司
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