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Process for preparing high-purity phosphoric acid by decoloring denitrified and impurity-removed phosphoric acid

A high-purity, phosphoric acid technology, applied in the direction of phosphoric acid, phosphorus oxyacids, phosphorus compounds, etc., can solve problems affecting the decolorization process, etc., and achieve the effect of improving removal efficiency, improving utilization rate, and increasing formation amount

Pending Publication Date: 2022-05-06
GUIZHOU BATIAN ECOTYPIC ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the extractant is an organic solvent, it is easy to absorb the carbonized organic matter, thus affecting the subsequent decolorization process

Method used

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  • Process for preparing high-purity phosphoric acid by decoloring denitrified and impurity-removed phosphoric acid

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Effect test

Embodiment 1

[0038] A kind of process that the present invention proposes decolorizes denitrified and impurity-removed phosphoric acid to prepare high-purity phosphoric acid. The method steps are as follows:

[0039] S1: Decompose phosphate rock / phosphate concentrate by acid hydrolysis solution;

[0040] S2: Filter the solution decomposed in S1 to remove acid insoluble matter to obtain the first solution;

[0041] S3: Freezing and crystallizing the first solution in S2 to remove part of the calcium salt crystals to obtain a second solution;

[0042] S4: adding sulfuric acid to the second solution of the solution in S3 and filtering to remove calcium to obtain a third solution;

[0043] S5: Evaporating the third solution in S4 to remove nitric acid in the solution to obtain a fourth solution;

[0044] S6: adding a decolorizing agent to the fourth solution in S5 for decolorization treatment to obtain a decolorized by-product and a fifth solution;

[0045] S7: Adding the first extractant t...

Embodiment 2

[0054] A kind of process that the present invention proposes decolorizes denitrified and impurity-removed phosphoric acid to prepare high-purity phosphoric acid. The method steps are as follows:

[0055] S1: Decompose phosphate rock / phosphate concentrate by acid hydrolysis solution;

[0056] S2: Filter the solution decomposed in S1 to remove acid insoluble matter to obtain the first solution;

[0057] S3: Freezing and crystallizing the first solution in S2 to remove part of the calcium salt crystals to obtain a second solution;

[0058] S4: adding sulfuric acid to the second solution of the solution in S3 and filtering to remove calcium to obtain a third solution;

[0059] S5: Evaporating the third solution in S4 to obtain a fourth solution;

[0060] S6: adding a decolorizing agent to the fourth solution in S5 for decolorization treatment to obtain a decolorized by-product and a fifth solution;

[0061] S7: Adding the first extractant to the fifth solution in S6 for extract...

Embodiment 3

[0070] A kind of process that the present invention proposes decolorizes denitrified and impurity-removed phosphoric acid to prepare high-purity phosphoric acid. The method steps are as follows:

[0071] S1: Decompose phosphate rock / phosphate concentrate by acid hydrolysis solution;

[0072] S2: Filter the solution decomposed in S1 to remove acid insoluble matter to obtain the first solution;

[0073] S3: Freezing and crystallizing the first solution in S2 to remove part of the calcium salt crystals to obtain a second solution;

[0074] S4: adding sulfuric acid to the second solution of the solution in S3 and filtering to remove calcium to obtain a third solution;

[0075] S5: Evaporating the third solution in S4 to obtain a fourth solution;

[0076] S6: adding a decolorizing agent to the fourth solution in S5 for decolorization treatment to obtain a decolorized by-product and a fifth solution;

[0077] S7: Adding the first extractant to the fifth solution in S6 for extract...

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Abstract

The invention discloses a process for preparing high-purity phosphoric acid by decoloring denitrified and impurity-removed phosphoric acid. The process comprises the following steps: S1, decomposing phosphorite / phosphate concentrate through acidolysis liquid; s2, filtering the solution decomposed in the step S1, and removing acid insoluble substances to obtain a first solution; s3, freezing and crystallizing the first solution in S2, and removing part of calcium salt crystals to obtain a second solution; s4, adding sulfuric acid into the second solution in the S3, filtering, and removing calcium to obtain a third solution; s5, carrying out evaporation treatment on the third solution in the S4, and removing nitric acid in the solution to obtain a fourth solution; s6, adding a decolorizing agent into the fourth solution in the S5 for decolorizing treatment to obtain a decolorized by-product and a fifth solution; and S7, adding a first extraction agent into the fifth solution in the step S6 for extraction to obtain an extraction phase, and then carrying out back extraction on the extraction phase through a second extraction agent to obtain the high-purity phosphoric acid solution. The purity and the yield of the prepared phosphoric acid are improved.

Description

technical field [0001] The invention relates to the technical field of phosphoric acid production, in particular to a process for preparing high-purity phosphoric acid by decolorizing denitrified and impurity-removed phosphoric acid. Background technique [0002] At present, for the preparation of high-purity phosphoric acid from non-calcined phosphate rock, the solution obtained after acid hydrolysis treatment must be colored. The existing treatment method mainly uses a decolorizing agent to decolorize the extracted solution. However, since the extractant is an organic solvent, it is easy to absorb carbonized organic matter, thereby affecting the subsequent decolorization process. Therefore, it is urgent to develop a method capable of efficiently preparing high-purity phosphoric acid. Contents of the invention [0003] Based on the technical problems in the background technology, the present invention proposes a process for preparing high-purity phosphoric acid by decolo...

Claims

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Application Information

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IPC IPC(8): C01B25/22C01B25/234C01B25/238
CPCC01B25/22C01B25/2216C01B25/234C01B25/238C01P2006/80
Inventor 黄德明赵国军刘法安方进黄仕英程静张凌云冯军强华建青
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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