阅读说明：本技术 一种螯合稀土的制备方法 (Preparation method of chelated rare earth ) 是由 王洪州 李先军 王洪军 于 2020-06-10 设计创作，主要内容包括：本发明公开一种螯合稀土的制备方法,它主要步骤如下：在反应釜中加入一定量的水,把螯合剂EDTA按比例用量加入反应釜中,加热,加入氢氧化钠,搅拌溶解,变清后加入一定量的稀土,然后加入聚磷酸盐,采用双螯合工艺,加水至刻度,再搅拌3-4小时；搅拌后静置1-1.5天,澄清后,去杂质,放入成品罐中,然后按要求包装；本发明产品解决了与腐殖酸、氨基酸、磷酸二氢钾、微量元素水溶肥、冲施肥、滴灌肥、有机肥等混配性差和肥料利用率低等问题。(The invention discloses a preparation method of chelated rare earth, which mainly comprises the following steps: adding a certain amount of water into a reaction kettle, adding a chelating agent EDTA into the reaction kettle according to the proportion, heating, adding sodium hydroxide, stirring for dissolving, adding a certain amount of rare earth after clearing, then adding polyphosphate, adding water to a scale by adopting a double-chelating process, and stirring for 3-4 hours; stirring, standing for 1-1.5 days, clarifying, removing impurities, placing into a finished product tank, and packaging as required; the product solves the problems of poor mixing performance with humic acid, amino acid, monopotassium phosphate, trace element water-soluble fertilizer, flush fertilizer, drip irrigation fertilizer, organic fertilizer and the like, low fertilizer utilization rate and the like.)

1. The preparation method of the chelated rare earth is characterized by comprising the following steps:

s1, under stirring, firstly adding a certain amount of water into a reaction kettle, then adding the chelating agent EDTA into the reaction kettle according to the proportional amount, and completely dissolving the chelating agent EDTA into the water by means of mechanical stirring and auxiliary heating to form a solution a; wherein the mass ratio of the chelating agent EDTA to the water is 1 (4-5), and the temperature of the liquid in the reaction kettle is 65-85 ℃;

s2, adding sodium hydroxide into the solution a under stirring, continuously stirring and dissolving in a mechanical stirring and auxiliary heating mode until the liquid in the reaction kettle is clear and transparent and has no suspended matters to obtain a solution b; the mass ratio of the sodium hydroxide to the chelating agent EDTA is 1 (2.5-4); the temperature of the liquid in the reaction kettle is 65-85 ℃;

s3, under stirring, sequentially adding a certain amount of rare earth nitrate and polyphosphate into the solution b, then adjusting to the standard scale of a reaction kettle by using water, continuously stirring for 3-4 hours in a mechanical stirring and auxiliary heating mode, wherein the temperature of liquid in the reaction kettle is 65-85 ℃, standing for 1-1.5 days after the reaction is stopped, and stopping stirring and heating in the standing process; the mass ratio of the rare earth nitrate to the chelating agent EDTA is (3-5) to 1, and the mass ratio of the polyphosphate to the chelating agent EDTA is (5-6) to 1;

and S4, opening a valve at the bottom of the reaction kettle, removing impurities generated after standing in the step S3, and then metering and subpackaging clear liquid.

2. The method of claim 1, wherein the chelating agent is selected from the group consisting of: in the step S1, the mass ratio of the chelating agent EDTA to the water is 1:5, and the temperature of the liquid in the reaction kettle is 80 ℃.

3. The method of claim 1, wherein the chelating agent is selected from the group consisting of: the mass ratio of the sodium hydroxide to the chelating agent EDTA in the step S2 is 1: 3.

4. The method of claim 1, wherein the chelating agent is selected from the group consisting of: in the step S3, the rare earth nitrate is 38% rare earth nitrate powder.

5. The method of claim 1, wherein the chelating agent is selected from the group consisting of: in the step S3, the mass ratio of the rare earth nitrate to the chelating agent EDTA is 4:1, and the mass ratio of the polyphosphate to the chelating agent EDTA is 5: 1.

Technical Field

The invention belongs to the technical field of agriculture and chemistry, and particularly relates to a preparation method of chelated rare earth.

Background

Rare earth agriculture is an original agricultural yield increasing way in China, a few agriculturists and biologists have explored research on the problem of promoting crop growth by rare earth elements abroad before the seventies of the century, but the rare earth elements are extremely expensive at that time, so that researchers do not make systematic sudden wavelength change on the rare earth agriculture. China carries out a large amount of systematic research work on rare earth agricultural problems from the beginning of the seventies, and the national science commission commissions the general companies of nonferrous metal industry, the agricultural department, the health department and related experts in China to comprehensively check and accept the scientific research achievements of agricultural rare earth in 1 month in 1986.

The rare earth has the main effects of promoting the rooting and the germination of crops, increasing the chlorophyll content, improving the photosynthesis efficiency of the crops, promoting the absorption and the operation of the crops on nutrient elements such as nitrogen, phosphorus and potassium and the like, increasing the yield of the crops and improving the quality of the crops in the growth process of the crops. At present, the rare earth is mainly applied to apple, pear, banana, vegetable, facility agriculture, peanut, forest, flower and seedling and other economic crops, and the yield can be increased by about 12 percent by using the rare earth alone.

The rare earth has better effects on preventing freezing and early germination of crops, protecting flowers and fruits, improving sugar degree, coloring and brightening, ensuring a round fruit shape, maturing in advance, reducing the natural fragrance of fruits and vegetables and the like, but has poor mixing performance with humic acid, amino acid, monopotassium phosphate, trace element water-soluble fertilizer, flush fertilizer, drip irrigation fertilizer, organic fertilizer, compound (mixed) fertilizer, insecticide and bactericide and herbicide, and is labor-consuming and time-consuming when being singly sprayed, and the effect of the rare earth on the crops cannot be fully exerted.

Disclosure of Invention

The invention aims to provide a preparation method of chelated rare earth, which solves the problems of poor mixing performance with humic acid, amino acid, monopotassium phosphate, trace element water-soluble fertilizer, flush fertilizer, drip irrigation fertilizer, organic fertilizer, compound (mixed) fertilizer, insecticide, bactericide, herbicide and the like, low fertilizer utilization rate and the like.

The invention provides a preparation method of chelated rare earth, which comprises the following steps:

s1, under stirring, firstly adding a certain amount of water into a reaction kettle, then adding the chelating agent EDTA into the reaction kettle according to the proportional amount, and completely dissolving the chelating agent EDTA into the water by means of mechanical stirring and auxiliary heating to form a solution a; wherein the mass ratio of the chelating agent EDTA to the water is 1 (4-5), and the temperature of the liquid in the reaction kettle is 65-85 ℃;

s2, adding sodium hydroxide into the solution a under stirring, continuously stirring and dissolving in a mechanical stirring and auxiliary heating mode until the liquid in the reaction kettle is clear and transparent and has no suspended matters to obtain a solution b; the mass ratio of the sodium hydroxide to the chelating agent EDTA is 1 (2.5-4); the temperature of the liquid in the reaction kettle is 65-85 ℃;

s3, under stirring, sequentially adding a certain amount of rare earth nitrate and polyphosphate into the solution b, then adjusting to the standard scale of a reaction kettle by using water, continuously stirring for 3-4 hours in a mechanical stirring and auxiliary heating mode, wherein the temperature of liquid in the reaction kettle is 65-85 ℃, standing for 1-1.5 days after the reaction is stopped, and stopping stirring and heating in the standing process; the mass ratio of the rare earth nitrate to the chelating agent EDTA is (3-5) to 1, and the mass ratio of the polyphosphate to the chelating agent EDTA is (5-6) to 1;

and S4, opening a valve at the bottom of the reaction kettle, removing impurities generated after standing in the step S3, and then metering and subpackaging clear liquid.

According to the preparation method of the chelated rare earth, in the step S1, the mass ratio of the chelating agent EDTA to the water is 1:5, and the temperature of the liquid in the reaction kettle is 80 ℃;

the method of claim, wherein the mass ratio of sodium hydroxide to EDTA in step S2 is 1: 3.

In the above method for preparing chelated rare earth, the rare earth nitrate in step S3 is 38% rare earth nitrate powder.

In the above method for preparing chelated rare earth, in step S3, the mass ratio of rare earth nitrate to chelating agent EDTA is 4:1, and the mass ratio of polyphosphate to chelating agent EDTA is 5: 1.

The invention discloses a preparation method of chelated rare earth, which mainly has the following technical advantages:

1. the compound rare earth additive can be used as an additive raw material, and has the effect of 3-5 times that of common rare earth.

2. The invention effectively solves the problem of poor mixing of rare earth, humic acid, amino acid, trace element water soluble fertilizer, flush fertilizer, drip irrigation fertilizer, organic fertilizer, compound fertilizer, pesticide, bactericide and herbicide, and has obvious effect after being added, thereby improving the utilization rate of the fertilizer, saving labor, time and money and conforming to the principle of chemical fertilizer reduction and synergism advocated by the state.

Detailed Description

To better illustrate the preparation and use of the disclosed chelated rare earths, the invention is further illustrated in the following examples. The specific embodiments are merely illustrative of the present invention and do not limit the present invention.