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Preparation method of water-insoluble phosphate

A phosphate and phosphoric acid technology, applied in the direction of phosphate, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of difficult washing and difficult treatment of chemical wastewater, etc., reduce the number of washing times, reduce chemical wastewater, and reduce nitrate The effect of the presence of impurities

Active Publication Date: 2017-06-13
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the mainstream process introduces a large amount of impurities in two links. The first is that anion impurities are often introduced when preparing soluble metal salt solutions. The second is that when adjusting the pH value, ammonia or sodium hydroxide is generally added, and cationic impurities are introduced. , which makes it difficult to wash during the preparation of water-insoluble phosphate, and forms a large amount of difficult-to-treat chemical wastewater

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  • Preparation method of water-insoluble phosphate

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preparation example Construction

[0025] The preparation method of the water-insoluble phosphate of the embodiment of the present invention, described method comprises the steps:

[0026] 1) The raw material capable of acid-eluting metal ions is dissolved with a mixed acid, and a clear solution is obtained after separation; the raw material capable of acid-eluting metal ions is selected from metals, metal oxides, metal hydroxides, metal carbonates and metal alkalis One or more mixtures of formula carbonates, said mixed acids include nitric acid and phosphoric acid;

[0027] 2) adding an organic reducing agent to the clarified solution to form a reaction system, the reaction generates water-insoluble phosphate, solid-liquid separation to obtain a phosphate solid, washing to remove impurities in the phosphate solid; the organic reducing The agent is selected from one or a mixture of aldehydes, phenols, alcohols and ketones.

[0028] Such metals include, but are not limited to, magnesium, iron, calcium, aluminum...

Embodiment 1

[0031] The preparation method of the water-insoluble phosphate of embodiment 1 of the present invention, at first dissolving the metal with the mixed acid of nitric acid and phosphoric acid, filtering to remove solid impurities to obtain a clear solution, then adding an organic reducing agent to the solution, and reacting at a certain temperature , when the yield of water-insoluble phosphate in the reaction system reaches an appropriate level, then filter and wash to obtain water-insoluble phosphate.

[0032] The metal is aluminum, and the water-insoluble phosphate is aluminum phosphate.

[0033] In the mixed acid, the molar ratio of nitric acid and phosphoric acid is 0.5:1.

[0034] The reaction temperature under the certain temperature condition is 70°C.

[0035] The yield of water-insoluble phosphate in the reaction system reaches an appropriate level of 60%.

[0036] The molar ratio of aluminum element to phosphoric acid in the raw material is 3 / n:1, n is the valence of ...

Embodiment 2

[0041] The preparation method of the water-insoluble phosphate of embodiment 2 of the present invention, at first the metal hydroxide raw material is dissolved with the mixed acid of nitric acid and phosphoric acid, and the solid impurity is removed by filtration to obtain a clarified solution, then an organic reducing agent is added in the solution, at a certain Reaction under temperature conditions, when the yield of water-insoluble phosphate in the reaction system reaches an appropriate level, then filter and wash to obtain water-insoluble phosphate.

[0042] The metal hydroxide raw material is magnesium hydroxide. The phosphate that is insoluble in water is magnesium phosphate.

[0043] In the mixed acid, the molar ratio of nitric acid and phosphoric acid is 10:1.

[0044] The reaction temperature under the certain temperature condition is 150°C.

[0045] The yield of water-insoluble phosphate in the reaction system reaches an appropriate level of 0.1%.

[0046] The mol...

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Abstract

The invention provides a preparation method of a water-insoluble phosphate. The method comprises the following steps: 1) dissolving raw materials capable of being acid soluble to form metal ions by using mixed acid, and separating to obtain a settled solution, wherein the raw materials capable of being acid soluble to form metal ions are selected from one or a mixture of more of metal, metallic oxide, meta hydroxide, carbonate and metal subcarbonate, and the mixed acid comprises nitric acid and phosphoric acid; 2) forming a reaction system after adding an organic reducing agent in the settled solution, conducting reaction to generate the water-insoluble phosphate, obtaining a phosphate solid, and washing to remove impurities in the phosphate solid, wherein the organic reducing agent is selected from one or a mixture of more of aldehydes, phenols, alcohols and ketone organic matters. Few involatile impurities are introduced in the system in the method, few washing times are required, and the prepared product is high in purity and small in granularity, so that an effective and feasible method is provided for the preparation of the water-insoluble phosphate.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation method of water-insoluble phosphate. Background technique [0002] Water-insoluble phosphate is an important phosphate compound, and its use varies with its purity. It has a wide range of uses in chemical industry, paint industry, new energy, agriculture, medicine, food, etc. [0003] At present, the preparation method of water-insoluble phosphate mainly adopts the precipitation method. Generally, a soluble metal salt solution is prepared first, and then mixed with phosphoric acid or soluble phosphate, and the pH value is adjusted to form water-insoluble phosphate, and then washed and filtered to make it insoluble. Phosphates in water. [0004] Because water-insoluble phosphate is generally difficult to wash, especially nano and micron-sized powders, washing is more difficult. For high-purity water-insoluble phosphate, in order to re...

Claims

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Application Information

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IPC IPC(8): C01B25/26C01B25/36C01B25/34C01B25/37B82Y40/00
CPCC01B25/265C01B25/34C01B25/36C01B25/37C01P2004/03C01P2004/64C01P2006/80
Inventor 张勇苏勇杰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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