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Wet process phosphoric acid purification system and preparation process thereof

A purification system, wet-process phosphoric acid technology, applied in the fields of phosphorus compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of high impurities in phosphate rock, difficult comprehensive cost of phosphorus resource conversion, etc., so as to improve the extraction purity and production process. The effect of short process and high production efficiency

Active Publication Date: 2020-02-21
WENGFU DAZHOU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the impurities in phosphate rock are relatively high, and a large number of impurity separation steps are required in the extraction process, which makes it difficult to further optimize the product structure and reduce the comprehensive cost of phosphorus resource conversion.

Method used

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  • Wet process phosphoric acid purification system and preparation process thereof
  • Wet process phosphoric acid purification system and preparation process thereof
  • Wet process phosphoric acid purification system and preparation process thereof

Examples

Experimental program
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Embodiment 1

[0040] The preparation technology of the wet-process phosphoric acid purification system provided by the invention comprises the following steps:

[0041] S1 is extracted in two stages in the extraction process section, so that the unloaded solvent and phosphoric acid are fully mixed, and the loaded solvent after extraction is phase-separated to separate the organic phase from the inorganic phase; after extraction, most of the phosphoric acid enters the organic phase; single series according to ( 4:1 ratio, that is 60m 3 / h of empty solvent and 15m 3 / h feed acid) for mixing, the temperature of the no-load solvent is controlled at 40±5°C, and the temperature of the feed acid is 60±5°C under no-load.

[0042] The organic phase after S2 S1 step separation reacts with BaCO3 back to acid to form BaSO4 precipitate, and then after sedimentation and separation, a fine desulfurization load solvent is obtained, and sulfate ions are further removed; the ratio of BaCO3 to load solvent i...

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Abstract

The invention discloses a wet process phosphoric acid purification system and a preparation process thereof. The system comprises an extraction process segment, a fine desulfurization segment, a washing process segment and a reverse extraction process segment, all of which are sequentially connected, wherein the extraction process segment has two stages and the reverse extraction process segment has two stages two. The wet process phosphoric acid purification system is provided with the extraction process segment and the reverse extraction process segment; in the extraction process segment, most phosphoric acid is separated into an organic phase; and in the reverse extraction process segment, the phosphoric acid is washed into water from the organic phase and then is conveyed into a solvent for cyclic use. In this way, the extraction purity of the phosphoric acid can be improved, and impurities can be separated more thoroughly.

Description

technical field [0001] The invention relates to the field of wet-process phosphoric acid preparation, in particular to a wet-process phosphoric acid purification system and a preparation process thereof. Background technique [0002] Phosphoric acid and phosphates are widely used in chemical, agricultural, daily chemical, electronics, food and other industries. The production methods of phosphoric acid mainly include thermal method and wet method, and the reaction between phosphoric acid and corresponding alkali is the main method for preparing phosphate. Compared with thermal phosphoric acid reduced by an electric furnace, wet-process phosphoric acid has obvious cost advantages and less environmental impact due to low energy consumption. However, since wet-process phosphoric acid comes from the crude phosphoric acid obtained by decomposing phosphate rock with inorganic acid (mainly sulfuric acid), the impurities in it are high and complex (including sulfate, fluoride ion, ...

Claims

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Application Information

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IPC IPC(8): C01B25/237
CPCC01B25/2377Y02P20/10
Inventor 付勇孙应伦李晓林冯云飞张力夫
Owner WENGFU DAZHOU CHEM CO LTD
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