Method for preparing zinc-rich calcium magnesium nitrate fertilizer by utilizing by-product calcium nitrate of phosphorus nitrate fertilizer

Abstract

The invention is applicable to the technical field of fertilizer preparation, and provides a method for preparing a zinc-rich calcium magnesium nitrate fertilizer by utilizing by-product calcium nitrate of a phosphorus nitrate fertilizer. The method comprises the following steps: supplying by-product crude calcium nitrate from preparation of the phosphorus nitrate fertilizer; adding magnesium oxide or magnesium hydroxide and zinc oxide into the calcium nitrate, carrying out a neutralization reaction, and carrying out mixing so as to obtain a calcium magnesium zinc nitrate mixed solution; and successively subjecting the calcium magnesium zinc nitrate mixed solution to filtration, concentration and granulation treatment so as to obtain a water-soluble calcium magnesium nitrate granular fertilizer with rich trace element zinc. According to the invention, the by-product crude calcium nitrate of the phosphorus nitrate fertilizer is directly used as a calcium source, and no external calcium source is needed to be introduced, so the cost for the raw materials of the phosphorus nitrate fertilizer is effectively reduced; meanwhile, zinc oxide is introduced to participate the neutralization reaction, so the use of the calcium magnesium nitrate fertilizer is expanded; the content of trace elements in crops is supplemented; the color and the smoothness of fruit appearance can be increased; the quality and the yield of fruits are improved; and the grade of a fruit product is enhanced.

Description

technical field [0001] The invention belongs to the technical field of fertilizer preparation, and in particular relates to a method for preparing a zinc-rich calcium nitrate and magnesium fertilizer by using calcium nitrate, a by-product of nitrophosphate fertilizer. Background technique [0002] Calcium magnesium nitrate fertilizer is an important water-soluble fertilizer, which mainly includes two water-soluble salts of calcium nitrate and magnesium nitrate. Among them, the nitrate nitrogen contained in the calcium and magnesium nitrate fertilizer can be directly absorbed by plants, quickly supplementing nutrients for plants; water-soluble calcium can promote the absorption of nitrogen, phosphorus, and potassium in the soil, and increase the resistance of crops; water-soluble magnesium can improve The content of chlorophyll in crops promotes photosynthesis. [0003] The existing method for preparing calcium-magnesium nitrate fertilizer is usually to mix the calcium-magne...

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Problems solved by technology

Yet this method produces calcium magnesium nitrate fertilizer, there is following problem: first, because there are many residues in the phosphorus tailings, cause equipment load big, output is low; Secondly, this method fails to fully activate the calcium salt in the tailings, so that It is necessary to re-introduce external calcium salt, and the utilization rate of calcium is insufficient; again, it needs to consume nitric acid and react with tailings, so the acid consumption is large and the cost is high

[0005] In addition, all kinds of calcium and magnesium nitrate fertilizers produced above do not contain the trace element zinc. However, for some commercial crops, it is necessary to increase the fruit setting rate, so additional corresponding fertilizers should be added as supplements, which will undoubtedly increase the production of crops. cost

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