Preparation method of chelated rare earth

Abstract

The invention discloses a preparation method of chelated rare earth. The preparation method mainly comprises the following steps: adding a certain amount of water into a reaction kettle, adding a chelating agent EDTA into the reaction kettle in proportion, heating, adding sodium hydroxide, stirring for dissolving, adding a certain amount of rare earth after the solution becomes clear, adding polyphosphate, adding water to a scale, and stirring for 3-4 hours; stirring, standing for 1-1.5 days, clarifying, removing impurities, putting a finished product into a finished product tank, and packaging according to requirements. A double-chelating process is adopted by the method. The product disclosed by the invention solves the problems of poor mixing property with humic acid, amino acids, monopotassium phosphate, trace element water-soluble fertilizers, water flush fertilizers, drip irrigation fertilizers, organic fertilizers and the like, low fertilizer utilization rate and the like.

Description

technical field [0001] The invention belongs to the technical field of agrochemicals, and in particular relates to a preparation method of chelated rare earth. Background technique [0002] The use of rare earths in agriculture is an original way to increase agricultural production in my country. Before the 1970s, a few agronomists and biologists abroad had explored the research on the effect of rare earth elements on promoting crop growth. However, at that time, rare earth elements themselves were extremely expensive. , so that scientific researchers have not achieved a systematic breakthrough in the agricultural use of rare earths. Since the early 1970s, my country has carried out a large number of systematic research work on the agricultural use of rare earths. In January 1986, the State Science and Technology Commission commissioned China Nonferrous Metals Industry Corporation, the Ministry of Agriculture and the Ministry of Health and relevant experts to study the scient...

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Problems solved by technology

[0005] The present invention aims to provide a preparation method of chelated rare earth, and the additive solves the problem of mixing with humic acid, amino acid, potassium dihydrogen phosphate, trace element water-soluble fertilizer, flushing fertilization, drip irrigation fertilizer, organic fertilizer, compound (mixed) fertilizer and Problems such as poor mixing of insecticides, fungicides and herbicides, and low utilization rate of fertilizers

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