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A kind of preparation method of iron-containing soil conditioner

A soil conditioner and a technology for preparation steps, which are applied in soil conditioning materials, preparation of organic compounds, preparation of carboxylate and other directions, can solve the problems of EDTA being not easily degraded, complicated preparation process, poor soil improvement effect, etc., and achieve a good pH Regulating effect, improving soil structure, obvious effect of improvement

Active Publication Date: 2021-04-13
KINGENTA ECOLOGICAL ENG GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many varieties of humic acid fertilizers and humic acid soil conditioners. There are three main types. One is to directly use low-rank coal to prepare humic acid soil conditioners. This method is low in cost, but humic acid in low-rank coal is insoluble in water. Sexual humic acid, it is difficult to produce effects in the current season, and the soil improvement effect is poor
One is to convert macromolecular humic acid into small molecular water-soluble humic acid by oxidation. The humic acid prepared by this method has better water solubility and anti-flocculation performance, but the preparation process is relatively complicated and the cost is high
The third type is to prepare humic acid into salt in a simple way, and convert insoluble humic acid into water-soluble humate. This method has simple process and low cost, but the anti-flocculation property of the obtained water-soluble humic acid is poor
Usually, EDTA is used as a chelating agent to protect iron ions, but EDTA is not easy to degrade, and it is easy to cause environmental pollution when applied to the soil; and EDTA chelating agent cannot effectively avoid Fe 2+ Oxidation, so the form of iron in EDTA chelated products is mostly Fe 3+
[0007] In order to solve the problem of soil improvement and low iron absorption efficiency of crops at the same time, it is necessary to develop a soil conditioner product that is simple to prepare, low in cost, has good water solubility and anti-flocculation of humic acid, and contains iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of iron-containing soil conditioner, the specific method is as follows:

[0034] Preparation of ferrous ammonium citrate: Mix 210g of citric acid monohydrate and 192g of water and stir to raise the temperature to 55°C, slowly add 4.6g of 250-mesh iron powder, and keep stirring for 4 hours, then the temperature drops to 40°C, and the The ammonia gas was neutralized to pH 6.5, and the resulting solution was distilled at 10kp and 70°C to remove water under reduced pressure to obtain 244.7g of a product containing ferrous ammonium citrate.

[0035] Grind 100g of weathered coal into 40 meshes, then add 40g of the ferrous ammonium citrate-containing product prepared above and 200g of water, and keep stirring and reacting at 60°C for 2h. The soil conditioner product A can be obtained by drying.

Embodiment 2

[0037] A preparation method of iron-containing soil conditioner, the specific method is as follows:

[0038]Preparation of ammonium ferrous citrate: Stir 192g of citric acid and 288g of water and raise the temperature to 70°C, slowly add 4.1g of 150 mesh iron powder, and keep stirring for 3 hours, then the temperature drops to 45°C, and the ammonia gas is introduced and to pH 6, the resulting solution was distilled at 20kp and 85°C to remove moisture under reduced pressure to obtain 244.6g of a product containing ferrous ammonium citrate.

[0039] Grind 100g of lignite into 60 mesh, then add 45g of the ferrous ammonium citrate-containing product prepared above and 150g of water, and keep stirring and reacting at 70°C for 4h. After the reaction is completed, bake the reactant at 50kp and 80°C Soil conditioner Product B was obtained by drying.

Embodiment 3

[0041] A preparation method of iron-containing soil conditioner, the specific method is as follows:

[0042] Preparation of ferrous ammonium citrate: Stir 192g of citric acid and 384g of water and raise the temperature to 85°C, slowly add 3.8g of 100 mesh iron powder, and keep stirring for 2 hours, then the temperature drops to 35°C, and the ammonia gas is introduced And to pH 5.5, the resulting solution was distilled at 25kp and 90°C to remove moisture under reduced pressure to obtain 244.4g of a product containing ferrous ammonium citrate.

[0043] Grind 100g of peat into a powder of 100 meshes, then add 50g of the ferrous ammonium citrate-containing product prepared above and 100g of water, and keep stirring and reacting at 80°C for 6h. The soil conditioner product C can be obtained by drying.

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Abstract

The invention relates to a method for preparing an iron-containing soil conditioner, which comprises the steps of preparing ferrous ammonium citrate; the preparation step of ferrous ammonium citrate; Add iron powder to stir the reaction, cool down after the reaction, pass through ammonia gas to neutralize to pH 5.5-6.5, remove water, and obtain ferrous ammonium citrate. In the present invention, ferrous ammonium citrate is added to low-rank coal to make The water-insoluble humic acid in low-rank coal is activated into water-soluble humic acid. The activation process is simple, and the activation rate of humic acid can reach more than 50%. The iron element in the prepared iron-containing soil conditioner is divalent iron, which is easier Absorbed by crops, in addition, ammonium citrate, ammonium humate and the entire pH buffer system are conducive to the stability of ferrous ammonium citrate. Iron phenomenon, to avoid crop yellowing.

Description

technical field [0001] The invention relates to a preparation method of an iron-containing soil conditioner, belonging to the technical field of soil conditioners. Background technique [0002] At present, due to the unreasonable application of chemical fertilizers in my country, problems such as soil pollution, acidification, salinization, degradation, and lack of nutrients have become increasingly prominent, which has become the biggest obstacle affecting the sustainable development of agriculture in our country. At present, more than 40% of my country's cultivated land has been degraded, and 150 million mu of cultivated land has been polluted. At the same time, since the 1980s, my country's soil conditioner products have begun to start. Through the joint efforts of scientific researchers and the entire industry, there are more and more types of products, and the technical level has been continuously improved. Soil conditioners have developed rapidly in recent years. . Ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/14C07C59/265C07C51/41C09K101/00C09K109/00
CPCC07C51/412C09K17/14C09K2101/00C09K2109/00C07C59/265
Inventor 胡兆平张艳玲李曰鹏徐文华张新梅郭宗端高建仁
Owner KINGENTA ECOLOGICAL ENG GRP
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