Mother liquor pretreatment and recycling method in the synthesis of chain glycine ferrous complex

Abstract

The invention provides a method for pretreatment and recycling of mother liquor in the synthesis of ferrous chain glycine complex, which belongs to the technical field of preparation of third-generation trace element feed additive-ferrous chain glycine complex. The main process of the method of the present invention is as follows: the synthesis mother liquor of ferrous glycosidic acid complex is stored under strong acidity; when the mother liquor is recycled, waste iron filings are used as reducing agent, reacted and hydrolyzed and precipitated under high temperature and strong acidity, and pumped while hot Filter into the reaction tank to realize the pretreatment and recycling of the mother liquor. The advantages and positive effects of the present invention are: there is no need to care about the storage time of the mother liquor and the degree of oxidation, and the low-cost waste iron filings are used instead of the high-cost reduced iron powder as the reducing agent, and the mother liquor can be guaranteed in the synthesis process. The required pH can also flocculate and co-precipitate the impurities accumulated in the circulating mother liquor, improve the product quality, and the operation is simple and convenient.

Description

technical field [0001] The invention belongs to the technical field of preparation of the third-generation trace element feed additive-chain ferrous glycosine complex, and in particular relates to a mother liquor pretreatment and recycling method in the synthesis of the chain ferrous glycinate complex. Background technique [0002] Water-soluble chain glycine ferrous complex is the third-generation trace element iron feed additive that has developed rapidly at home and abroad in recent years. It uses ferrous sulfate and glycine as the main raw materials. It is stirred and mixed at 60°C-80°C with a molar ratio of about 1:1. After hydrothermal synthesis for 0.5-1h, it is cooled to a certain temperature to directly crystallize and precipitate the product. Its production process is simple, the yield is high, and the cost is low. [0003] Since the ferrous glycoside complex is water-soluble, the mother liquor after cooling and crystallization always contains a considerable amoun...

AI Technical Summary

Problems solved by technology

However, in the production process and the mother liquor storage process of intermittent production, there is not only the problem that ferrous iron is easily oxidized by air, but also the problem of accumulation of impurities due to repeated circulation of the mother liquor, which affects the color and quality of the product

[0004] In order to realize the recycling of mother liquor and ensure the color and quality of the product, some are protected by nitrogen gas during the production process and the mother liquor storage process, but a large amount of nitrogen is consumed; some are protected by reducing agents such as reduced iron powder, but reduced iron powder The price of other reducing agents is high, and excessive reduced iron powder also affects the circulation of the mother liquor, which needs to be filtered

In short, no matter it is nitrogen protection or reduced iron powder protection, it is difficult to completely prevent ferrous iron from being oxidized by air during the mother liquor storage and repeated cycle production process. Heavy metal ion impurities, which gradually adversely affect product quality