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Method for depriving arsenic fluorin phosphoric acid from tail gas of yellow phosphorus

A yellow phosphorus tail gas and removal technology is applied in separation methods, chemical instruments and methods, dispersed particle separation, etc. simple structure

Inactive Publication Date: 2008-02-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this treatment method is that the consumption of lye is large, the cost is high, and the sewage needs to be treated separately, and the process is complicated.

Method used

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  • Method for depriving arsenic fluorin phosphoric acid from tail gas of yellow phosphorus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1. Take the yellow phosphorus tail gas production methanol as an example after purification

[0036] The composition and impurity content of yellow phosphorus tail gas are as follows:

[0037] Yellow phosphorus tail gas

Element

CO

CO 2

N 2

H 2

CH 4

O 2

Volume ratio

85～92％

2～4％

1～3％

4～5％

0.4％

1.0％

[0038]The impurity content of yellow phosphorus tail gas:

[0039] Impurities

As

SiF 4

Total P

h 2 S

Concentration (mg / L)

1.8

450

800

1150

[0040] Yellow phosphorus tail gas volume is 3500Nm 3 / h.

[0041] The lime milk concentration is 10%, the lime milk volume is 55 liters / h, and the circulating water volume is 20m 3 / h. Circulating water quality is phosphorus -1 <100mg / L, pH value 6-8.

[0042] Absorption tower: φ1800×14000mm, three sets, each equipped with two swirl nozz...

Embodiment 2

[0048] Embodiment 2. Taking the purified yellow phosphorus tail gas power generation as an example

[0049] The composition and impurity content of yellow phosphorus tail gas are as follows:

[0050] Yellow phosphorus tail gas

Element

CO

CO 2

N 2

H 2

CH 4

O 2

Volume ratio

85.4％

2.7％

4.39％

6.48％

0.43％

0.6％

[0051] The impurity content of yellow phosphorus tail gas:

[0052] Element

As

h 2 S

Total P

HF

Concentration (mg / L)

2

1050

1170

370

[0053] Yellow phosphorus tail gas volume is 1750Nm 3 / h.

[0054] The lime milk concentration is 5%, the lime milk volume is 50 liters / h, and the circulating water volume is 10m 3 / h.

[0055] Absorption tower: φ1400×11000mm, three sets, each equipped with two swirl nozzles, and the distance between the nozzles is 4m.

[0056] Circulation canal:...

Embodiment 3

[0061] Embodiment 3. Take the yellow phosphorus tail gas burning boiler as an example after purification

[0062] The composition and impurity content of yellow phosphorus tail gas are as follows:

[0063] Element

CO

CO 2

N 2

O 2

Volume ratio

89.7％

1.6％

7.5％

1.2％

[0064] The impurity content of yellow phosphorus tail gas:

[0065] Element

As

h 2 S

Total P

HF

Concentration (mg / L)

1.8

850

800

400

[0066] Yellow phosphorus tail gas volume is 1050Nm 3 / h.

[0067] The lime milk concentration is 8%, the lime milk volume is 25 liters / h, and the circulating water volume is 6m 3 / h.

[0068] Absorption tower: φ1200×11000mm, three sets, each equipped with two swirl nozzles, and the distance between the nozzles is 4m.

[0069] Circulation canal: 1.6×5.4×1.5m.

[0070] Circulating pump: 3 sets of 40GW9-30, two open and one stand...

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Abstract

A process for removing P, S, As and F from the tail gas generated by preparing yellow phosphorus features that the P, S, As and F can be removed by use of the absorbent prepared from the cyclic water generated by treating the sewage containing yellow phosphorus and lime milk, and use of serially connected 3 absorption towers.

Description

(1) Technical field: [0001] The invention belongs to the field of yellow phosphorus tail gas purification. (two) background technology: [0002] The tail gas escaping from the yellow phosphorus electric furnace is mainly composed of phosphorus vapor and carbon monoxide, and a small amount of As 2 o 3 、SiF 4 、H 2 S, P 2 o 5 ,P 4 、PH 3 , CO 2 、H 2 O and other gases, and a small amount of dust entrained in the exhaust gas. After the furnace gas is condensed by the condensation tower, the temperature of the tail gas is about 35-40°C, most of the phosphorus vapor is condensed, and the phosphorus content in the tail gas reaches 1000mg / Nm 3 Left and right, the content of dust and silicon fluoride in the exhaust gas has decreased, but the content is still relatively high. Generally, for every ton of yellow phosphorus produced, 2500-3000Nm is discharged 3 Yellow phosphorus tail gas, the tail gas contains 85-92% CO, CO 2 2-4%, 500~800mg phosphorus / Nm 3 Phosphorus, 1~2mg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/18B01D53/78
Inventor 宁平殷在飞罗上华陈樑陈云华
Owner KUNMING UNIV OF SCI & TECH
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