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Production method of improving water soluble phosphorus content of phosphate fertilizer soluble in citric acid

A production method and citrate-soluble technology, applied in nitrogen fertilizer, fertilization equipment, fertilizer mixture, etc., can solve the problems of sodium dodecylbenzenesulfonate strong foaming power, unfavorable industrial production, unfavorable reaction, etc., and achieve an increase in nitrogen content , Nitrogen loss reduction, environmental friendly effect

Pending Publication Date: 2019-04-09
云南云天化以化磷业研究技术有限公司
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  • Description
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  • Application Information

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Problems solved by technology

Although this patent can partially convert citrate-soluble phosphorus into water-soluble phosphorus, the sodium dodecylbenzenesulfonate in the added activator has strong foaming power, which is unfavorable to the reaction; the cost of adding activator and stabilizer in the process increases, resulting in Water-soluble phosphorus slurry is connected to the follow-up utilization process, and the process is long, which is not conducive to industrial production

Method used

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  • Production method of improving water soluble phosphorus content of phosphate fertilizer soluble in citric acid

Examples

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Effect test

Embodiment 1

[0030] S1: Weigh 100 grams of urea sulfate (urea: sulfuric acid = 2.2:1) and add it to 1000 grams of citrate-soluble phosphate fertilizer (the ratio of water-soluble phosphorus to available phosphorus is 25%), and mix and react at 60°C for 50 minutes to obtain material A;

[0031] S2: Material A was cured at 50°C for 60 minutes to obtain material B;

[0032] S3: Material B was aged at 45°C for 1 day to obtain the primary product of compound fertilizer, the ratio of water-soluble phosphorus to available phosphorus was 65.83%.

Embodiment 2

[0034] S1: Weigh 300 grams of urea sulfate (urea: sulfuric acid = 1.22:1) and add it to 1000 grams of citrate-soluble phosphate fertilizer (the ratio of water-soluble phosphorus to available phosphorus is 30%), and mix and react at 75°C for 70 minutes to obtain material A;

[0035] S2: Material A was cured at 55°C for 90 minutes to obtain material B;

[0036] S3: Material B was matured at 50°C for 2 days to obtain the primary product of compound fertilizer, the ratio of water-soluble phosphorus to available phosphorus was 84.81%.

Embodiment 3

[0038] S1: Weigh 400 grams of urea sulfate (urea: sulfuric acid = 0.92:1) and add it to 1000 grams of citrate-soluble phosphate fertilizer (the ratio of water-soluble phosphorus to available phosphorus is 40%), and mix and react at 90°C for 90 minutes to obtain material A;

[0039] S2: Material A was cured at 60°C for 120 minutes to obtain material B;

[0040] S3: Material B was matured at 55°C for 3 days to obtain the primary product of compound fertilizer, the ratio of water-soluble phosphorus to available phosphorus was 74.54%.

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Abstract

The invention provides a production method of improving water soluble phosphorus content of a phosphate fertilizer soluble in citric acid. The production method comprises the following steps: (1) mixing reaction: adding urea sulfate which accounts for 10-40% of the phosphate fertilizer soluble in citric acid into the phosphate fertilizer soluble in citric acid and mixing the urea sulfate and the phosphate fertilizer soluble in citric acid at a reaction temperature of 60-90 DEG C for 50-90 min to obtain a material a; (2) curing: curing a material A at 50-60 DEG C for 60-120 min to obtain a material B; and (3) curing: curing a material B at 45-55 DEG C for 1-3 days to obtain a compound fertilizer initial product. By mixing the urea sulfate with the phosphate fertilizer soluble in citric acid, the phosphorus soluble in citric acid is converted into water soluble phosphorus by means of hydrogen ions and acid radical ions after the urea sulfate is dissociated and urea is then complexed withwater soluble phosphorus to obtain the water soluble phosphorus in a complexed state. By treating the phosphate fertilizer soluble in citric acid by means of the method, the water soluble phosphoruscontent in the fertilizer is improved effectively. The method is simple in process and low in cost.

Description

technical field [0001] The invention belongs to the technical field of fertilizer production, and in particular relates to a production method for increasing the water-soluble phosphorus content of citrate-soluble phosphate fertilizers. Background technique [0002] Citrate-soluble phosphate fertilizer, also known as weakly acid-soluble phosphate fertilizer, is a kind of fertilizer that is difficult to dissolve in water and is not easily absorbed by plants. Therefore, the utilization rate of phosphorus is very low, which is not conducive to its application in agriculture. [0003] During the production process of wet-process phosphoric acid, part of the impurities associated with phosphate rock enters phosphoric acid, resulting in a high content of impurities in wet-process phosphoric acid. According to the different products produced, it is necessary to remove or reduce the related impurities in phosphoric acid. In the process of using wet-process phosphoric acid to produce...

Claims

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Application Information

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IPC IPC(8): C05G1/00
CPCC05B17/00C05C9/00
Inventor 曾波马航陈红琼钟英李志祥
Owner 云南云天化以化磷业研究技术有限公司
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