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Method for comprehensively utilizing phosphate fertilizer by-product

A by-product and phosphate fertilizer technology, applied in the field of phosphate fertilizer by-product utilization, can solve the problems that product quality cannot meet market requirements, restrict the development of phosphate fertilizer industry, and cannot be effectively used, and achieve low equipment material requirements, easy industrial production, well-designed effects

Inactive Publication Date: 2004-12-15
云南三环化工有限公司 +1
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  • Summary
  • 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 fertilizer industry, is not only not effectively utilized, but also becomes the main pollutant in the phosphate fertilizer industry, seriously restricting the development of the phosphate fertilizer industry.

Method used

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  • Method for comprehensively utilizing phosphate fertilizer by-product
  • Method for comprehensively utilizing phosphate fertilizer by-product
  • Method for comprehensively utilizing phosphate fertilizer by-product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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 Add iron filings or iron salts (addition amount is 150% of theoretical amount) to fluosilicic acid with a content of 18%. The pH of the ammonium fluoride solution was controlled to be 8.5 after the ammoniation reaction. Filter, wash (twice) to remove silica gel. The entire ammonium fluoride solution was vacuum concentrated (85° C.) to a water content of <4%, and dried to obtain solid ammonium hydrogen fluoride. Solid ammonia hydrogen fluoride (98%) reacts with concentrated sulfuric acid (135% of the theoretical amount) at high temperature (140°C), and the generated HF gas is condensed or absorbed to produce anhydrous hydrogen fluoride and hydrofluoric acid. The mixture of ammonium...

Embodiment 2

[0077] 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

[0079] 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. Solid ammonium hydrogen fluoride reacts with concentrated sulfuric acid (93%, the amount added is 100% of the theoretical amount) at high temperature (180°C); the mixture of ammonium sulfate and ammonium bisulfate is mixed with vaporized liquid ammonia. Other processes are the same as in Example 1.

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Abstract

The method of comprehensively utilizing phosphate fertilizer by-product includes utilizing ammonium fluoride solution of 3-14% concentration to absorb side product fluorine containing tail gas ammonium fluorosilicate solution; adding iron scrap or iron salt to fluorosilicic acid as one other by-product to eliminate phosphorus; adding liquid ammonia, ammonia water or ammonium bicarbonate; filtering, washing, and eliminating silica precipitate; returning ammonium fluoride solution to phosphate fertilizer absorbing system, concentration and drying to obtain ammonium hydrogen fluoride; reacting solid ammonium hydrogen fluoride and sulfuric acid at high temperature to obtain HF gas, absorbing HF gas to obtain hydrofluoric acid, purification and condensation to obtain anhydrous HF; and mixing the mixture of ammonium sulfate and ammonium bisulfate with ammonium bicarbonate or ammonia in a mixer, curing and crushing to ammonium sulfate fertilizer.

Description

technical field [0001] The invention relates to a utilization method of phosphate fertilizer by-products, more specifically, the invention uses fluorosilicic acid by-product of phosphate fertilizer or fluorine-containing tail gas as raw materials to produce hydrofluoric acid, anhydrous hydrogen fluoride and ammonium sulfate by-product. Background technique [0002] In the prior art, most manufacturers of hydrofluoric acid and anhydrous hydrogen fluoride adopt the "fluorite method". The process flow is: fluorite concentrate powder and sulfuric acid are measured by the metering device, continuously added to the screw feeder, mixed and sent to the external heat reaction furnace. The generated HF gas is exported from the feed end, and part of the H is removed in the crude distillation column 2 SO 4 and dust. Then use graphite condenser and bubble cap tower to condense and absorb to obtain hydrofluoric acid of different specifications, or pass through de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C01B7/19C01C1/16C01C1/244
Inventor 明大增杨建中宁延生李志祥朱春雨寇丽华杨跃华
Owner 云南三环化工有限公司
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