Preparation method of phosphate

A phosphate and phosphate yield technology, applied in the direction of phosphate, phosphorus oxyacids, chemical instruments and methods, etc., can solve the problems of difficult phosphate washing and difficult chemical wastewater, so as to save consumption costs and reduce chemical wastewater , the effect of reducing the number of washing

Active Publication Date: 2018-02-06
WUHAN INSTITUTE OF TECHNOLOGY
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  • 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. , making washing in the preparation process of phosphate particularly difficult, and forming a large amount of chemical wastewater that is difficult to treat

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preparation example Construction

[0024] By providing a preparation method of phosphate, the present invention solves the defects of high product impurity content, large amount of washing water, high COD content of waste water and high cost in the process of preparing phosphate in the prior art.

[0025] In order to solve the above defects, the main ideas of the embodiments of the present invention are:

[0026] The preparation method of the phosphate of the embodiment of the present invention, described method comprises the steps:

[0027] 1) The raw material capable of acid-eluting metal ions is dissolved with an acid, and a clear solution is obtained after separation; the acid comprises nitric acid, and the raw material capable of acid-eluting metal ions is selected from metals, metal oxides, metal hydroxides, metal carbon One or more mixtures of acid salts and metal basic carbonates;

[0028] 2) After adding a phosphorus-containing reducing agent into the clarified solution, a reaction system is formed, a...

Embodiment 1

[0035] Such as figure 1 As shown, the preparation method of phosphate in Example 1 of the present invention includes: 1) dissolving the raw material capable of acid-eluting metal ions with nitric acid, and obtaining a clear solution after separation; 2) adding a phosphorus-containing reducing agent in the clear solution Finally, a reaction system is formed, and the reaction generates phosphate and nitrogen oxide gas. When the phosphate yield in the reaction system reaches an appropriate level, the phosphate solid and mother liquor are obtained after solid-liquid separation, and the impurities in the phosphate solid are washed away.

[0036] In the step 1), the raw material of the acid-elutable metal ion is selected from aluminum hydroxide;

[0037] The phosphate yield in the reaction system in the step 2) reaches an appropriate level, that is, the yield reaches 98%.

[0038] In the step 2), the phosphorus-containing reducing agent is elemental phosphorus.

[0039] The temper...

Embodiment 2

[0043] Such as figure 2 Shown, the preparation method of embodiment 2 phosphate of the present invention comprises:

[0044] 1) The raw material that can be acid-dissolved metal ions is firstly dissolved in a mixed acid of nitric acid and phosphoric acid, and a clear solution is obtained after separation;

[0045] 2) After adding a phosphorus-containing reducing agent into the clarified solution, a reaction system is formed, and the reaction generates phosphate and nitrogen oxide gas. When the phosphate yield in the reaction system reaches an appropriate level, phosphate solid and mother liquor are obtained after solid-liquid separation , washing to remove impurities in the phosphate solid;

[0046] 3) After oxidizing the nitrogen oxide gas generated in step 2) with oxygen, use water or the above mother liquor to absorb into nitric acid, and use it as a raw material for dissolving acid-elutable metal ions in step 1).

[0047] In the step 1), the raw material of the acid-elu...

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Abstract

The invention provides a preparation method of phosphate. The preparation method comprises the following steps of (1) using acid to dissolve the raw material which can dissolve out metal ions by acid,and separating, so as to obtain a clear solution, wherein the acid comprises nitric acid, and the raw material which can dissolve out metal ions by acid is a mixture of one or multiple of metal, metal oxide, metal hydroxide, metal carbonate and metal base carbonate; (2) adding a phosphor-containing reducing agent into the clear solution to form a reaction system, and reacting to generate the phosphate and oxynitride gas; when the yield rate of phosphate in the reaction system reaches the proper degree, separating solid and liquid, so as to obtain phosphate solid and mother liquid; washing toremove the impurities out of the phosphate solid, wherein the phosphor-containing reducing agent is a phosphor-containing matter with valence state lower than positive five valence. The preparation method has the advantages that the amount of impurities introduced into the system is small, the washing frequency is low, and the cost is low; the prepared product has high purity and small granularity, and a feasible method is provided for the preparation of the 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 phosphate. Background technique [0002] Phosphate is an important phosphate compound, and its use varies with its purity. It is widely used in chemical industry, paint industry, new energy, agriculture, medicine, food, etc. [0003] At present, the preparation method of phosphate mainly adopts the precipitation method. Generally, a soluble metal salt solution is firstly prepared, and then mixed with phosphoric acid or soluble phosphate, the pH value is adjusted to form phosphate, and then washed and filtered to obtain phosphate. [0004] Because phosphate is generally difficult to wash, especially for nano and micron powders, washing is more difficult. For high-purity phosphate to reduce the impurity content, the amount of water consumed is even greater. At present, the mainstream process introduces a large amount of impur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/26C01B25/36C01B25/37
CPCC01B25/265C01B25/36C01B25/37
Inventor 张勇苏勇杰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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