Method for producing industrial phosphoric acid by wet-process phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid

A technology of wet-process phosphoric acid and ammonium polyphosphate, applied in phosphoric acid, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of extraction stages, device energy consumption, stripping agent consumption increase, and phosphoric acid extraction efficiency. Improvement, without considering the influence of anions, etc., to achieve the effect of less impurities, high efficiency, and high phosphorus yield

Active Publication Date: 2022-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although this process solves the problem of dependence on phosphate rock and the treatment of slag acid and raffinate acid in the traditional process, the process does not consider the impact of anions, such as fluoride ions
At the same time, the return of raffinate acid to raw acid will increase the load of the first step of extraction, resulting in a significant increase in the number of extraction stages, device energy consumption, and stripping agent consumption
In addition, the extraction efficiency of phosphoric acid in the second step is not significantly improved compared with the traditional process

Method used

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  • Method for producing industrial phosphoric acid by wet-process phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid
  • Method for producing industrial phosphoric acid by wet-process phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid
  • Method for producing industrial phosphoric acid by wet-process phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] This embodiment provides a figure 1 The method for purifying high-concentration wet-process phosphoric acid shown, the method comprises the following steps:

[0084] The composition of the wet-process phosphoric acid (aqueous phase 1) selected in this example is shown in Table 1 below.

[0085] Table 1

[0086] component Fe 2 O 3 / %

Al 2 O 3 / %

MgO / % P 2 O 5 / %

SO 3 / %

MER Content (wt%) 0.900 1.110 0.85 24.32 1.90 0.118

[0087] (1) Pretreatment: barium carbonate and activated carbon are simultaneously added to the wet-process phosphoric acid (aqueous phase 1), and the wet-process phosphoric acid is simultaneously desulfurized and decolorized. The specific operation is as follows: under normal pressure, keeping the temperature at 50° C., adding 130% of theoretical amount of barium carbonate and 1% of activated carbon by weight of phosphoric acid to the wet-process phosphoric acid, and reacting for 10 minutes. ...

Embodiment 2

[0106] This embodiment provides a figure 1 The method for purifying high-concentration wet-process phosphoric acid shown, the method comprises the following steps:

[0107] The wet-process phosphoric acid composition selected in this example is shown in Table 6 below.

[0108] Table 6

[0109] component Fe 2 O 3 / %

Al 2 O 3 / %

MgO / % P 2 O 5 / %

SO 3 / %

MER Content (wt%) 0.900 1.110 0.85 24.32 1.90 0.118

[0110] (1) Pretreatment: barium carbonate and activated carbon are simultaneously added to the wet-process phosphoric acid (aqueous phase 1), and the wet-process phosphoric acid is simultaneously desulfurized and decolorized. The specific operation is as follows: under normal pressure, keeping the temperature at 50° C., adding 130% of theoretical amount of barium carbonate and 1% of activated carbon by weight of phosphoric acid to the wet-process phosphoric acid, and reacting for 10 minutes. After the reaction was c...

Embodiment 3

[0129] This embodiment provides a figure 1 The method for purifying high-concentration wet-process phosphoric acid shown, the method comprises the following steps:

[0130] The composition of the wet-process phosphoric acid selected in this example is shown in Table 11 below.

[0131] Table 11

[0132] component Fe 2 O 3 / %

Al 2 O 3 / %

MgO / % P 2 O 5 / %

SO 3 / %

MER Content (wt%) 0.900 1.110 0.85 24.32 1.90 0.118

[0133] (1) Pretreatment: barium carbonate and activated carbon are simultaneously added to the wet-process phosphoric acid (aqueous phase 1), and the wet-process phosphoric acid is simultaneously desulfurized and decolorized. The specific operation is as follows: under normal pressure, keeping the temperature at 50° C., adding 130% of theoretical amount of barium carbonate and 1% of activated carbon by weight of phosphoric acid to the wet-process phosphoric acid, and reacting for 10 minutes. After the react...

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Abstract

The invention relates to a method for producing industrial phosphoric acid by wet-process phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid, belonging to the technical field of wet-process phosphoric acid. The technical problem solved by the invention is to provide a method for producing industrial phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid by wet-process phosphoric acid. The method includes pretreatment, removal of metal ions, decolorization, concentration, extraction, washing of the extract phase, stripping and concentration to obtain industrial-grade phosphoric acid, and raffinate to produce ammonium polyphosphate or to produce solid phosphoric acid. The invention concentrates the purified acid from which metal ions are removed into high-concentration anhydrous phosphoric acid and then enters the phosphoric acid extraction section. The raffinate acid can be directly used as a raw material for the production of water-soluble APP liquid fertilizer without concentration, realizing the high added value of the raffinate acid use. The phosphoric acid extraction process has extremely high efficiency, does not need multi-stage countercurrent extraction, has high phosphorus yield and high extraction rate, and the obtained industrial phosphoric acid has high purity and less impurities.

Description

technical field [0001] The invention relates to a method for producing industrial phosphoric acid by wet process phosphoric acid and co-producing ammonium polyphosphate or solid phosphoric acid, and belongs to the technical field of wet process phosphoric acid. Background technique [0002] Phosphoric acid is a bulk product in the phosphorus chemical industry, mainly used in the production of various phosphate fertilizers such as ammonium phosphate (MAP, DAP) and superphosphate. High-purity phosphoric acid and phosphates are also widely used in petroleum, electronics, food and pharmaceutical industries. In industry, phosphoric acid is mainly produced by wet process, that is, inorganic acid and phosphate rock (Ca 10 (PO 4 ) 6 F 2 ·CaCO 3 ) leaching phosphoric acid solution after direct reaction. Due to the limitation of phosphate rock purity, a large amount of impurities will be enriched in wet-process phosphoric acid. The impurities are related to the composition of p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234C01B25/238C01B25/18C01B25/40
CPCC01B25/234C01B25/238C01B25/405C01B25/18C01P2006/80
Inventor 刘善超杨林周清烈刘皓州
Owner SICHUAN UNIV
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