Method of producing zinc phosphate using phosphorus fertilizer

A technology of zinc phosphate and wet zinc phosphate, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of high production cost, low purity, and high impurity content in products, and achieve the effects of low production cost, wide sources, and low price

Inactive Publication Date: 2008-06-18
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

There are three disadvantages in this method: the one, because impurity exists in the solution after acid-dissolving zinc oxide, or this solution must be further purified, or product impurity content is higher, and purity is low; More energy; the third is that the wet product produced by the reaction contains organic solvents. If the organic solvent is recovered, it will consume a lot of energy, and because the boiling point of TBP is higher than the dehydration temperature of zinc phosphate dihydrate, it is difficult to control the amount of crystal water in the product
The essence of this process is to prepare zinc phosphate by double decomposition reaction. The purity requirements of the two raw materials are relatively high, and the production cost is also relatively high.

Method used

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  • Method of producing zinc phosphate using phosphorus fertilizer

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Embodiment 1

[0034] Dissolve 1.25kg fertilizer grade diammonium phosphate into 1.5kg of 75℃ hot water under stirring, keep the temperature at 75℃, filter after 35 minutes, wash the filter residue with 70℃ hot water once, and combine the lotion and filtrate; 2.6kg sulfuric acid Zinc (ZnSO 4 ·7H 2 O) A zinc salt solution prepared by dissolving in 2.0 kg of hot water at 70°C, and filtering; the solution prepared by the two raw materials is added to a stirred reactor, and the reaction temperature is maintained at 50°C. After the raw material liquid is added, 40wt% Adjust the pH to 6.8 by sodium hydroxide, and filter the reaction solution after maintaining the temperature for 20 minutes; the filter cake is washed three times with hot water at 70°C, which is three times its weight, to obtain a zinc phosphate wet cake; under normal pressure, at 110°C Dry for 20 minutes to obtain the product zinc phosphate. The analysis results are shown in Table 1:

[0035] Table 1 Product analysis results of Example...

Embodiment 2

[0039] 3kg of fertilizer grade monoammonium phosphate was dissolved in 3.5kg of 75℃ hot water under stirring, kept at 75℃ for 35 minutes and then filtered, the filter residue was washed twice with 60℃ hot water, the washing liquid and the filtrate were combined; 7 kg of zinc sulfate (ZnSO 4 ·7H 2 O) Dissolve in 5kg, 70-80℃ hot water and filter to prepare a 45wt% zinc salt solution, filter; the above two solutions are added to a stirred reactor at the same time, the reaction temperature is maintained at 70-80℃, after the solution is added , Adjust the pH value to 7.2-8 with 40wt% sodium hydroxide, and filter the reactant after maintaining the temperature for 18 minutes; the filter cake is washed twice with 4 times its weight in hot water at 80°C to obtain a zinc phosphate wet filter cake; It was pressed and dried at 110°C for 18 minutes to obtain the product zinc phosphate. The analysis results are shown in Table 2:

[0040] Table 2 Product analysis results of Example 2

[0041] ...

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Abstract

A process for preparing zinc phosphate from P fertilizer includes such steps as respectively dissolving fertilizer-class ammonium phosphate and soluble Zn salt in hot water, proportionally adding them to a container with stirrer, keeping the temp to 50-80 deg.C, regulating pH=6.5-8.5, ageing reaction, filtering, washing the filtered cake with hot water to obtain wet zinc phosphate, and drying.

Description

[0001] 1. Technical Field: Inorganic Salt Chemical Industry 2. Background technology: [0002] Zinc Phosphate Zn 3 (PO 4 ) 2 ·ΧH 2 O (χ is 0, 2, 4), mainly used for environmentally friendly anti-corrosion pigments, ferrous metal phosphating, and a small amount used for glass, enamel, ceramics, etc. There are currently two types of industrial production methods, as follows: [0003] 1. Neutralization method [0004] It is obtained by adding dilute phosphoric acid to the zinc oxide water slurry for neutralization, maturation, filtration and drying. [0005] 3ZnO+2H 3 PO 4 +H 2 O→Zn 3 (PO 4 ) 2 ·4H 2 O↓ [0006] The production process is more complicated. The ratio of the amount of zinc oxide and phosphoric acid used is 3:1, and zinc oxide cannot be completely converted. Zinc oxide and the product zinc phosphate tetrahydrate are almost insoluble in water, and this reaction is essentially a precipitation conversion reaction. The traditional external heating method must be time-consumin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/26
Inventor 宁平马兴良瞿广飞李军燕
Owner KUNMING UNIV OF SCI & TECH
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