Coproduction method of diammonium phosphate and monoammonium phosphate and equipment for neutralizing washing liquid

A technology of monoammonium phosphate and diammonium phosphate, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of reducing the capacity and life of phosphoric acid concentration equipment, affecting the stability of the production line, and high investment in production capacity, and extending the life of the concentration equipment , The effect of improving the capacity of the concentration equipment and reducing the cost of the product

Inactive Publication Date: 2003-09-17
SICHUAN UNIV
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Problems solved by technology

This kind of large-scale ammonium phosphate production device has high software costs, high key hardware prices and supporting infrastructure construction, resulting in high investment per unit production capacity and poor economic benefits for enterprises, especially the diammonium phosphate production line formed by western imported equipment. The process steps are phosphoric acid concentration, neutralization granulation, drying, and tail gas washing, so the phosphoric acid concentration process must concentrate the extracted dilute phosphoric acid to 50-52%P 2 o 5 The above cleaning of the tail gas can solve the water balance and meet the requirements of the phosphoric acid concentration for neutralization and granulation, which will not only reduce the capacity and life of the phosphoric acid concentration equipment, but also affect the stability of the production line operation

Method used

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  • Coproduction method of diammonium phosphate and monoammonium phosphate and equipment for neutralizing washing liquid
  • Coproduction method of diammonium phosphate and monoammonium phosphate and equipment for neutralizing washing liquid
  • Coproduction method of diammonium phosphate and monoammonium phosphate and equipment for neutralizing washing liquid

Examples

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Embodiment 1

[0021] This example is the transformation of the imported diammonium phosphate production line. The production capacity of the original diammonium phosphate production line is 600,000 tons per year. After the transformation, the production capacity is 800,000 tons per year, of which 600,000 tons of granular / year, powdery monoammonium phosphate 200,000 tons / year. The modified process such as figure 1 As shown, the extracted phosphoric acid is 400,000 tons, 300,000 tons of which are produced by the "concentrated phosphoric acid method" of the original production line to produce diammonium phosphate, and 100,000 tons of which are used to wash the tail gas produced by the production of diammonium phosphate and wash with the tail gas The liquid is used as the raw material, and the powdery monoammonium phosphate is produced by the "neutralization slurry concentration method". The process steps of producing diammonium phosphate include phosphoric acid concentration, neutralization,...

Embodiment 2

[0023] This embodiment is a newly-built diammonium phosphate and monoammonium phosphate co-production production line, and the technological process is as follows figure 2 shown. 80% of the extracted phosphoric acid is produced by "concentrated phosphoric acid method" to produce diammonium phosphate, and the rest is used to wash the tail gas produced by the production of diammonium phosphate, and the tail gas washing liquid is used as raw material to produce diammonium phosphate by "neutralization slurry concentration method" Monoammonium Phosphate Granular. The process steps of producing diammonium phosphate include concentration of phosphoric acid, neutralization and drying of raw materials in turn; concentration of phosphoric acid is to concentrate dilute phosphoric acid with a concentration of 25% to concentrated phosphoric acid with a concentration of 42%; the process parameters of neutralization, granulation and drying are: The pre-neutralization degree of the slurry i...

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Abstract

A process for preparing diammonium phosphate and ammonium phosphate features that one part of extracted phosphoric acid is used to prepare diammonium phosphate through concentrating, neutralizing, granulating and drying and the other part is used to prepare ammonium phosphate through washing the tail gas generated in neutralizing-granulating steps, neutralizing the washing liquid, concentrating and spraying drying (or granulating and drying). The neutralizing equipment for washing liquid is composed of flash evaporator, reactino lifting up tube and lowering down tube and forced circulating pump.

Description

1. Technical field [0001] The invention belongs to the field of ammonium phosphate production, in particular to a co-production method of diammonium phosphate and monoammonium phosphate and special equipment. 2. Background technology [0002] There are two basic methods for the production of ammonium phosphate, one is the "phosphoric acid concentration method" and the other is the "neutralization slurry concentration method". "Phosphoric acid concentration method" is to concentrate the extracted dilute phosphoric acid to the required concentration and then neutralize, granulate and dry, which is mainly used for high-quality phosphate rock; "Neutralization slurry concentration method" is to firstly dilute the extracted phosphoric acid with ammonia Blend into a slurry, then concentrate the slurry to the required concentration and then granulate or pulverize it. It is suitable for both medium and low-grade phosphate rocks, and also suitable for high-quality phosphate rocks. We...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
Inventor 钟本和应建康朱家骅张允湘冯余清
Owner SICHUAN UNIV
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