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Technology of preparing ammonium phosphide using solid liquid reextraction method

An ammonium phosphate and process technology, which is applied in the field of preparing solid ammonium phosphate compound fertilizer from wet-process phosphoric acid, can solve the problem of no fundamental change or improvement in technical and economic indicators, achieve comprehensive technical and economic indicators improvement, simplify process flow and shorten process The effect of the process

Inactive Publication Date: 2008-06-25
湖北中磷科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned methods are still not freed from the technology of heating and concentrating (phosphoric acid or slurry) to remove water in essence. Therefore, in general, the complexity of the process, the requirements for equipment and materials, and the energy consumption level. There is no fundamental change or improvement in technical and economic indicators, etc.

Method used

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  • Technology of preparing ammonium phosphide using solid liquid reextraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The wet-process phosphoric acid obtained by the sulfuric acid method is used as raw material, and the composition of the wet-process phosphoric acid:

[0038] P 2 o 5 18.9%, Fe 2 o 3 0.48%, Al 2 o 3 0.88%,

[0039] Mg 1.37%, F 1.31%, SO 3 1.8%,

[0040] Take 120g of the above-mentioned wet-process phosphoric acid, according to the volume ratio of tributyl phosphate and co-solvent 260# kerosene as 1:1, measure 400ml×2 composite extractant for three-stage countercurrent extraction, and the extraction temperature is controlled at 32-45°C. After the extraction, the terminal raffinate aqueous phase contains a small amount of white solid, after separation, the liquid phase removes the original acid system, and the solid phase mixture contains effective P 2 o 518.13% is used as agricultural fertilizer. After the extraction, the extracted oil phase enters the washing reactor and is washed with phosphoric acid with a weight concentration of 20%. The was...

Embodiment 2

[0042] Get the calcium chlorphosphate 140g (wherein P 2 o 5 Content is 27.07%, CaO 26.41%), industrial hydrochloric acid 100ml and the washing acid 28ml that last circulation returns enter acid hydrolysis tank together and make hydrochloric acid method wet-process phosphoric acid. Take 140ml of the filtered wet-process phosphoric acid, and use the compound extractant liquid-liquid three-stage extraction. The temperature of the extraction process was controlled at 32-45° C., and all subsequent steps after the extraction were completed were exactly the same as in Example 1, and finally 49 g of the ammonium phosphate product was obtained, of which effective P 2 o 5 43.61%, N content 13.18%, moisture 2.21%.

[0043] The material in the process is completely closed loop, and there are no emissions.

Embodiment 3

[0045] The process of preparing ammonium phosphate by solid-liquid back extraction method, such as figure 1 As shown, it includes the following steps:

[0046] 1), preparation of compound extractant:

[0047] The main material composition of the composite extractant is tributyl phosphate and co-solvent 260# kerosene. The volume ratio of tributyl phosphate and co-solvent 260# kerosene is 1:3.

[0048] 2), wet-process phosphoric acid concentration adjustment:

[0049] Wet-process phosphoric acid produced by hydrochloric acid method, the acid content in wet-process phosphoric acid is 15%, P 2 o 5 The content is 10%; the wet-process phosphoric acid is put into the head tank 1 of the wet-process phosphoric acid.

[0050] 3), liquid-liquid extraction:

[0051] The well-prepared composite extractant and the adjusted wet-process phosphoric acid enter from the light phase inlet and the heavy phase inlet of the three-stage countercurrent continuous sedimentation extractor 2 respect...

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Abstract

A process for preparing ammonium phosphate by solid-liquid back extraction method includes such steps as liquid-liquid extraction to obtain phosphoric acid from wet-method phosphoric acid, and direct back extracting by ammonia or its compound to obtain ammonium phosphate crystals.

Description

technical field [0001] The invention belongs to the field of preparing solid ammonium phosphate compound fertilizer by wet-process phosphoric acid, and in particular relates to a process for preparing ammonium phosphate by a solid-liquid back extraction method. Background technique [0002] The key to the production of solid ammonium phosphate compound fertilizer by wet process phosphoric acid is the water and impurities in the acid, which constitute the unavoidable difficulties in the production process of ammonium phosphate. The focus of the process is to develop and improve the process around these two points. ,improve. [0003] In view of these two objectively existing problems, the current engineering technologies that have been gradually formed and generally adopted mainly include the "phosphoric acid concentration method" and the "neutralization slurry concentration method" that is being developed and improved. The phosphoric acid concentration process is to evaporat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28C05B7/00
Inventor 熊祥祖潘志权丁一刚
Owner 湖北中磷科技有限公司
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