Process for preparing ammonium hydrogen fluoride

A technology of ammonium bifluoride and ammonium fluoride, which is applied in the field of ammonium bifluoride preparation, can solve the problems that the product quality cannot meet the market requirements, restrict the development of the phosphate fertilizer industry, and cannot be effectively used, and achieve low equipment material requirements and easy industrial production , design reasonable effect

Inactive Publication Date: 2004-12-15
云南云天化国际化工有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are the same problems: first, the production cost is high; second, the product quality cannot meet the market requirements
Therefore, fluosilicic acid, a valuable by-product of the phosphate fertil

Method used

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  • Process for preparing ammonium hydrogen fluoride
  • Process for preparing ammonium hydrogen fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Absorb the by-product fluorine-containing tail gas of phosphate fertilizer production with 10% ammonium fluoride solution, obtain (NH 4 ) 2 SiF 6 22% ammonium fluorosilicate solution. Another by-product H in the ammonium fluorosilicate solution or phosphate fertilizer production 2 SiF 6 Iron filings or iron salts are added to fluosilicic acid with a content of 18%, and the addition amount of iron filings or iron salts is 150% of the theoretical amount; to remove phosphorus that affects product quality; then add gasified liquid ammonia or NH 3 The content is 15% ammonia water, and the pH of the control solution is 8.5. Filter and wash to remove silica precipitate; part of the ammonium fluoride solution is returned to the phosphate fertilizer absorption system, concentrated and dried to obtain the required ammonium bifluoride product. The ammonia-containing water vapor produced by concentration is absorbed by fluosilicic acid and returned to the system.

[0036] Th...

Embodiment 2

[0039] The other processes are the same as in Example 1 except that the ammonia-containing water vapor produced by concentration is absorbed by fluosilicic acid and then returned to the system, or sent to the phosphate fertilizer system to absorb fluorine-containing tail gas after condensation, or sent to other ammonia-using devices for recovery.

Embodiment 3

[0041] In addition to neutralizing 18% fluorosilicic acid (P 2 o 5 content is 0.05%) solution, while adding iron filings or iron salt (addition amount is 200% of theoretical amount). After the ammoniation reaction, the pH of the ammonium fluoride solution was controlled to be 9.0. Filter, wash (twice) to remove silica gel. The entire ammonium fluoride solution was vacuum concentrated (at 85° C.) to a water content of <4%, and dried to obtain solid ammonium hydrogen fluoride. Other processes are the same as in Example 1.

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Abstract

The present invention discloses production process of ammonium hydrogen fluoride. Ammonium fluoride solution in 3-14% concentration is used to absorb fluorine containing tail gas as side product of phosphate fertilizer production to obtain ammonium fluorosilicate solution of 8-12% ammonium fluorosilicate content. Iron scrap or iron salt is added into ammonium fluorosilicate solution or one other side product from phosphate fertilizer production to eliminate phosphorus; and through adding gasified liquid ammonia or ammonia water or ammonium bicarbonate, filtering, washing to eliminate SiO2 precipitate, returning ammonium fluoride solution to phosphate fertilizer absorbing system, concentration and drying, the ammonium hydrogen fluoride product is obtained.

Description

technical field [0001] The present invention relates to the preparation method of ammonium bifluoride. More specifically, it is a method for preparing ammonium bifluoride from by-products in phosphate fertilizer production. Background technique [0002] In the prior art, the methods for producing ammonium bifluoride mainly include liquid-phase method and gas-phase method. The liquid-phase method is obtained by vaporizing liquid ammonia and passing it into 40% hydrofluoric acid cooled by ice water for external use to fully react it. The gas phase method is produced by the direct reaction of pure ammonia and hydrogen fluoride gas. At present, the liquid phase method is generally used in industry. [0003] Fluorosilicate (H 2 SiF 6 ) is usually a by-product of the production of wet-process phosphoric acid and general calcium. Every ton of wet-process phosphoric acid produced (100%P 2 o 5 ) about 0.06 tons of fluorosilicic acid (100% H 2 SiF 6 ...

Claims

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Application Information

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IPC IPC(8): B09B3/00C01B9/08C01C1/16
Inventor 吕庆胜杨建中朱春雨杨先宁延生寇丽华资学民
Owner 云南云天化国际化工有限公司
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