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Feed-grade wet-process phosphoric acid deep purification method

A wet-process phosphoric acid, deep purification technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of inability to obtain high-purity phosphoric acid, and the effect of removing impurities is not obvious, so as to reduce the crystallization phenomenon and improve the Purity, the effect of meeting the needs of high-quality use

Pending Publication Date: 2021-02-26
湖南新发展农牧科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual application of the existing wet-process phosphoric acid deep purification method, the effect of removing impurities is not obvious, and high-purity phosphoric acid cannot be obtained. After liquid-solid separation, the phosphoric acid containing various impurities is obtained. Wet-process phosphoric acid is generally used for manufacturing Phosphate fertilizer, if you want to produce high-quality phosphate products, you need to be further purified

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a technical solution: a method for deep purification of feed-grade wet-process phosphoric acid, comprising the following steps:

[0025] Step 1: Mix the modified inorganic salt, wet-process phosphoric acid, and pure water according to the proportion, stir, and let it stand for precipitation;

[0026] Step 2: removing the liquid in the upper part of the stratified layer after step 1 is left to stand, and retaining the residue of standing precipitation;

[0027] Step 3: add sulfuric acid to the residue in step 2, and feed sodium hydroxide gas to obtain mineral A;

[0028] Step 4: Dry Mineral A at low temperature to remove water;

[0029] Step 5: drying the mineral A dried in step 4 at a high temperature to obtain a product.

[0030] In this embodiment, preferably, the modified inorganic salt preparation step in step 1 is:

[0031] Step A: Stir and mix sodium carbonate, potassium carbonate, magnesium carbonate, ammonium carbonate, sodium hydroxide...

Embodiment 2

[0040] The invention provides a technical solution: a method for deep purification of feed-grade wet-process phosphoric acid, comprising the following steps:

[0041] Step 1: Mix the modified inorganic salt, wet-process phosphoric acid, and pure water according to the proportion, stir, and let it stand for precipitation;

[0042] Step 2: removing the liquid in the upper part of the stratified layer after step 1 is left to stand, and retaining the residue of standing precipitation;

[0043] Step 3: add sulfuric acid to the residue in step 2, and feed sodium hydroxide gas to obtain mineral A;

[0044] Step 4: Dry Mineral A at low temperature to remove water;

[0045] Step 5: drying the mineral A dried in step 4 at a high temperature to obtain a product.

[0046] In this embodiment, preferably, the modified inorganic salt preparation step in step 1 is:

[0047] Step A: Stir and mix sodium carbonate, potassium carbonate, magnesium carbonate, ammonium carbonate, sodium hydroxide...

Embodiment 3

[0056] The invention provides a technical solution: a method for deep purification of feed-grade wet-process phosphoric acid, comprising the following steps:

[0057] Step 1: Mix the modified inorganic salt, wet-process phosphoric acid, and pure water according to the proportion, stir, and let it stand for precipitation;

[0058] Step 2: removing the liquid in the upper part of the stratified layer after step 1 is left to stand, and retaining the residue of standing precipitation;

[0059] Step 3: add sulfuric acid to the residue in step 2, and feed sodium hydroxide gas to obtain mineral A;

[0060] Step 4: Dry Mineral A at low temperature to remove water;

[0061] Step 5: drying the mineral A dried in step 4 at a high temperature to obtain a product.

[0062] In this embodiment, preferably, the modified inorganic salt preparation step in step 1 is:

[0063] Step A: Stir and mix sodium carbonate, potassium carbonate, magnesium carbonate, ammonium carbonate, sodium hydroxide...

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Abstract

The invention discloses a feed-grade wet-process phosphoric acid deep purification method, which comprises the following steps: 1, proportionally mixing modified inorganic salt, wet-process phosphoricacid and pure water, stirring, and standing for precipitation; 2, removing liquid at the upper part of the layering after standing in the step 1, and reserving the residues of standing precipitation;3, adding sulfuric acid into the residues obtained in the step 2, and introducing sodium hydroxide gas to obtain a mineral A; 4, drying the mineral A at a low temperature to remove water; 5, drying the mineral A dried in the step 4 at high temperature to obtain a product. By adding the modified inorganic salt and carrying out low-temperature and high-temperature dual drying in processing, the crystallization phenomenon caused by high water content in the meal is greatly reduced, the purity of the finished product is greatly improved, and the high-quality use requirement is met.

Description

technical field [0001] The invention belongs to the technical field of wet-process phosphoric acid, and in particular relates to a deep purification method for feed-grade wet-process phosphoric acid. Background technique [0002] Wet-process phosphoric acid refers to the phosphoric acid obtained by decomposing phosphate rock with sulfuric acid, nitric acid or hydrochloric acid, collectively referred to as wet-process phosphoric acid, and the method of using sulfuric acid to decompose phosphoric acid to obtain phosphoric acid is the most basic method in the production of wet-process phosphoric acid. The production methods mainly include thermal method and wet method. The first thermal phosphoric acid is to use the electric furnace method to prepare yellow phosphorus, and then obtain relatively pure industrial phosphoric acid through oxidation and absorption; the wet phosphoric acid is to decompose phosphate rock with strong acids such as sulfuric acid or hydrochloric acid. ...

Claims

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Application Information

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IPC IPC(8): C01B25/234
CPCC01B25/234
Inventor 陈海涛王荣发稂降龙王勇
Owner 湖南新发展农牧科技有限公司