Production method of industrial grade diammonium phosphate with wet-process phosphoric acid

A technology of high-grade diammonium phosphate and wet-process phosphoric acid, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of high energy consumption in the production process, unstable product quality, high cost, etc., and achieve low production cost, good society and Economic benefits, energy consumption and low cost effects

Inactive Publication Date: 2013-04-24
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing industrial-grade diammonium phosphate with wet-process phosphoric acid, so as to solve the pr

Method used

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  • Production method of industrial grade diammonium phosphate with wet-process phosphoric acid
  • Production method of industrial grade diammonium phosphate with wet-process phosphoric acid

Examples

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Effect test

Embodiment 1

[0031] Will P 2 o 5Wet-process phosphoric acid with a concentration of 25% is fed into the neutralization tank, and ammonia gas is introduced into the neutralization tank under stirring conditions. When the pH value of the slurry is 4.3, the ammonia flow is stopped, and the slurry is filtered while it is hot. Sent to the compound fertilizer plant to produce fertilizer-grade monoammonium phosphate compound fertilizer, the filtrate enters the secondary neutralization tank; in the secondary neutralization tank, continue to feed ammonia gas for neutralization, stop passing ammonia when the pH value of the slurry reaches 7.0, and the secondary neutralization tank After the secondary neutralization is completed, it is sent to the purification tank; in the purification tank, ammonium sulfide is added to the secondary neutralization slurry to stir and react. After passing the test, stop adding ammonium sulfide, filter and separate with a centrifuge, and the filter cake metal slag is u...

Embodiment 2

[0033] Will P 2 o 5 The wet-process phosphoric acid with a concentration of 30% is sent into the neutralization tank, and the ammonia water with a mass concentration of 25% is added to the neutralization tank under stirring conditions, and the ammonia water is stopped when the pH value of the slurry is 4.5, and the slurry is hot. Filtration, the filter cake is sent to the compound fertilizer plant to produce fertilizer-grade monoammonium phosphate compound fertilizer, and the filtrate is sent to the secondary neutralization tank; continue to add ammonia water in the secondary neutralization tank for neutralization, and stop the flow when the pH value of the slurry reaches 7.1 Ammonia, the secondary neutralization is completed and sent to the purification tank; in the purification tank, ammonium sulfide is added to the secondary neutralization slurry to stir and react. After passing the test, stop adding ammonium sulfide, filter and separate with a centrifuge, and filter cake m...

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Abstract

The invention discloses a production method of industrial grade diammonium phosphate with wet-process phosphoric acid, and the wet-process phosphoric acid is used as raw material to prepare the industrial grade diammonium phosphate through two times of neutralization reaction with ammonia. The production method of the industrial grade diammonium phosphate with the wet-process phosphoric acid is characterized by putifying the industrial grade diammonium phosphate with ammonium sulfide in the preparation process of the industrial grade diammonium phosphate, then desulfurizing the purified industrial grade diammonium phosphate with calcium hydrogen phosphate, and further adjusting potential of hydrogen (pH) value, concentrating, crystallizing, drying and packaging the industrial grade diammonium phosphate. The production method of the industrial grade diammonium phosphate with the wet-process phosphoric acid is low in energy consumption and cost, small in pollution in the production process and capable of effectively removing metal impurities in the wet-process phosphoric acid and improving the product quality of the industrial grade diammonium phosphate.

Description

technical field [0001] The invention relates to a method for producing industrial-grade diammonium phosphate with wet-process phosphoric acid. Background technique [0002] In the prior art, the disadvantages of producing industrial-grade diammonium phosphate with thermal phosphoric acid or purified phosphoric acid as raw materials are high energy consumption, high cost, and large pollution; the disadvantage of industrial-grade diammonium phosphate produced by wet method is that the product quality is not good Stable, this is because the high metal content of the product will change with the quality of phosphoric acid in the impurity removal process, which makes it difficult to guarantee the quality of the product. [0003] The difficulty in producing industrial-grade diammonium phosphate with wet-process phosphoric acid is how to effectively remove impurities in phosphoric acid. Wet-process phosphoric acid contains a lot of impurities, such as Mg 2＋ , Ca 2 ＋ , Fe 3＋ 、A...

Claims

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Application Information

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IPC IPC(8): C01B25/28
Inventor 廖吉星朱飞武彭宝林潘礼富周勇郑超宋同斌王先炜谢静张丽韩朝应张强星
Owner GUIZHOU KAILIN GRP CO LTD
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