Method for mother solution pretreatment and cyclic utilization in chain type ferrous glycine complex synthesis

Abstract

The invention provides a method for mother solution pretreatment and cyclic utilization in chain type ferrous glycine complex synthesis, and belongs to the technical field of third-generation microelement feed additive-chain-type ferrous glycine complex preparation. The method comprises the main steps that a ferrous glycine complex synthesis mother solution is stored in strong acid; when the mother solution is recycled, waste scrap iron is adopted as a reducing agent, a reaction and hydrolytic precipitation are performed on the high temperature and strong acid conditions, suction filtration is performed at the high temperature to a reaction kettle, and the mother solution is pretreated and recycled. The method has the advantages that the storage time and the oxidation degree of the mother solution do not need to be considered, the low-cost waste scrap iron is utilized for replacing high-cost reduced iron powder as a reducing agent, the pH needed in the mother solution synthesis can also be ensured, meanwhile, flocculation and coprecipitation can also be performed in the circulating mother solution for accumulating impurities, the product quality is improved, and operation is easy 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