Preparation method of artificial humic acid urea slow-release fertilizer

A humic acid urea, slow-release fertilizer technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of nitrogen fertilizer loss of soil and environment, unstable product quality, excessive heavy metals, etc. Slow release effect, effect of high nitrogen content

Pending Publication Date: 2022-04-08
NORTHEAST AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the existing humic acid urea fertilizer preparation method has high cost, unstable product quality, excessive heavy metals and a large amount of nitrogen fertilizer loss in agriculture that affect the soil and the environment, and provide an artificial humic acid urea fertilizer. Preparation method of urea phytic acid slow-release fertilizer

Method used

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  • Preparation method of artificial humic acid urea slow-release fertilizer
  • Preparation method of artificial humic acid urea slow-release fertilizer
  • Preparation method of artificial humic acid urea slow-release fertilizer

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specific Embodiment approach 1

[0024] Specific embodiment one: the preparation method of a kind of artificial humic acid urea slow-release fertilizer of present embodiment is finished according to the following steps:

[0025] 1. Mix the biomass powder, active additives and water into the reactor, control the temperature rise program of the reactor, conduct the hydrothermal humification reaction of the biomass powder under high temperature and high pressure conditions, and then cool to room temperature to obtain the artificial Solid-liquid mixed products of humic substances;

[0026] 2. Suction filter the solid-liquid mixed product containing artificial humus, remove the solid, and obtain the artificial humus liquid; adjust the pH value of the artificial humus liquid to 1, and then leave it to stand to obtain a solid substance; use deionized water as a cleaning agent, The solid matter is subjected to several times of centrifugal cleaning to neutrality, and then vacuum-dried to obtain artificial humic acid s...

specific Embodiment approach 2

[0030] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the biomass powder described in step 1 is one or a mixture of rice straw, corn stalk, soybean straw, leaves and sawdust, The particle size of the biomass powder is 50 mesh to 100 mesh. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the active auxiliary agent described in step one is NaOH, KOH, industrial soda ash and Ca(OH) 2 , Ca(OH) 2 with Na 2 CO 3 One or a mixture of several of them. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of an artificial humic acid urea slow-release fertilizer, and relates to a preparation method of a slow-release fertilizer. The invention aims to solve the problems of high cost, unstable product quality, excessive heavy metal and influence on soil and environment caused by large loss of nitrogenous fertilizer in agriculture in the existing preparation method of humic acid urea fertilizer. The method comprises the following steps: 1, preparing a solid-liquid mixed product containing artificial humus; 2, preparing artificial humic acid powder; and 3, mixing the artificial humic acid powder with a urea solution, reacting, and freeze-drying to obtain the artificial humic acid urea slow-release fertilizer. Humic acid prepared from agricultural solid waste biomass reacts with urea to synthesize the artificial humic acid urea slow-release fertilizer, so that the nitrogen content in the artificial humic acid urea is increased, the long-acting slow-release effect of the urea fertilizer is further improved, meanwhile, the contents of heavy metals and impurities in the urea fertilizer can be reduced, and the use effect is improved. According to the invention, the artificial humic acid urea slow-release fertilizer can be obtained.

Description

technical field [0001] The invention relates to a preparation method of slow-release fertilizer. Background technique [0002] The synthesis technology of artificial humic acid urea fertilizer plays an important role in the resource utilization of industrial and agricultural organic waste. The application of artificial humic acid technology and its corresponding innovative fertilizer processing technology can produce fertilizer products integrating green, high energy and high efficiency, which can effectively promote the development of green and environmental protection fertilizer industry and meet the needs of modern agriculture and environmental protection in my country. Since humic acid urea can prolong the retention time of nitrogen in urea in the soil, prolong the fertilizer effect and play a slow-release role, it is widely used in long-acting slow-release urea. Existing humic acid long-acting slow-release urea all obtains mineral source humic acid (general humic acid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/40C05G3/80
Inventor 杨帆金永旭袁月程魁
Owner NORTHEAST AGRICULTURAL UNIVERSITY
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