A process for recovering ammonia from tungsten smelting ammonia nitrogen wastewater waste gas

A technology for ammonia nitrogen waste water and ammonia recovery, applied in the field of ammonia recovery process, can solve the problems of low available value, increased cost, uncompetitive enterprises, etc., and achieves the effects of easy control, low cost and easy operation.

Active Publication Date: 2016-06-08
CNMC GUANGXI PGMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific idea is to make ammonium salt or ammonia water through the method of absorption. Although some methods solve the environmental protection problem, the usable value is not very high, and at the same time, additional costs will be added, making the enterprise uncompetitive.

Method used

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  • A process for recovering ammonia from tungsten smelting ammonia nitrogen wastewater waste gas

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Such as figure 1 Said, the process for recovering ammonia from the waste gas of ammonia nitrogen from tungsten smelting:

[0023] Step one, the APT crystallization steam and ammonia tail gas (ammonia content is 3000mg / m 3 ) Introduce the rectification tower through the induced draft fan, control the temperature to be maintained at 90℃, and recover the ammonia through the steam-water separator. The recovered liquid ammonia is 0.16m in 1 hour 3 .

[0024] Step two, the kettle residue after the rectification of ammonia nitrogen waste gas and ammonia nitrogen wastewater 20m 3 (Ammonia content is 30g / L) pump into a stirred tank, add sodium hydroxide with a concentration of 150g / L to activate ammonia, adjust the pH to 10, and pump to the stripping tower after ammonia activation. Ammonia waste gas is introduced into the stripping tower, adding 150g / L sodium hydroxide to adjust the pH to 10, and stripping at 45°C for 2h. After stripping, the ammonia nitrogen concentration...

Embodiment 2

[0026] Example 2: Such as figure 1 Said, the process for recovering ammonia from the waste gas of ammonia nitrogen from tungsten smelting:

[0027] Step one, the APT crystallization steam and ammonia tail gas (ammonia content is 3500mg / m 3 ) Introduce the rectification tower through the induced draft fan, control the temperature to maintain at 90℃, and recover the ammonia through the steam-water separator. The recovered liquid ammonia is 0.20m in 1 hour 3 .

[0028] Step two, the kettle residue after the rectification of ammonia nitrogen waste gas and ammonia nitrogen wastewater 20m 3 (Ammonia content is 40g / L) pump into the stirring tank, add 150g / L sodium hydroxide for ammonia activation, adjust the pH to 11, after ammonia activation, pump to the stripping tower, and at the same time the ammonia activated Ammonia waste gas is introduced into the stripping tower, adding 150g / L sodium hydroxide to adjust the pH to 11, and stripping at 90°C for 2h. After stripping, the ammonia nitro...

Embodiment 3

[0030] Example 3: Such as figure 1 Said, the process for recovering ammonia from the waste gas of ammonia nitrogen from tungsten smelting:

[0031] Step one, the APT crystallization steam and ammonia tail gas (ammonia content is 3500mg / m 3 ) Introduce the rectification tower through the induced draft fan, control the temperature to maintain at 95℃, and recover the ammonia through the steam-water separator. The recovered liquid ammonia is 0.22m in 1 hour 3 .

[0032] Step two, the kettle residue after the rectification of ammonia nitrogen waste gas and ammonia nitrogen wastewater 20m 3 (Ammonia content is 40g / L) pump into the stirring tank, add 150g / L sodium hydroxide for ammonia activation, adjust the pH to 11, after ammonia activation, pump to the stripping tower, and at the same time the ammonia activated Ammonia waste gas is introduced into the stripping tower, adding 150g / L sodium hydroxide to adjust the pH to 11.5, and stripping at 90°C for 2h. After stripping, the ammonia nit...

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Abstract

The invention relates to a process of recovering ammonia from ammonia-nitrogen wastewater and exhaust gas of tungsten metallurgy. The process is characterized by comprising the following steps: introducing ammonium paratungstate crystal steam and ammonia tail gas into a rectifying tower by virtue of an induced draft fan, maintaining the temperature in a range of 90-95 DEG C and condensing and recovering ammonia by using a steam separator; pumping kettle raffinate and ammonia-nitrogen wastewater which are generated after rectifying the ammonia-nitrogen wastewater into a stirring tank, adding sodium hydroxide for ammonia activation, and adjusting the pH value to 10-11; after ammonia activation, pumping to an air stripping tower, and meanwhile, introducing ammonia wastewater generated by ammonia activation into the air stripping tower, adding sodium hydroxide to adjust the pH value to 10-11.5, and controlling the temperature at 45-90 DEG C and carrying out air stripping for 2 hours; feeding ammonia gas generated in the air-stripping process and ammonia gas which is not condensed by the steam separator into a hydrochloric acid spray tower for circular adsorption to generate ammonium chloride and returning to the main process to prepare an analytical solution. The process provided by the invention is simple in process flow, stable in treatment effect, less in equipment investment, free from secondary pollution and low in treatment cost.

Description

Technical field [0001] The invention relates to an ammonia recovery process, in particular to a process for recovering ammonia from waste gas of ammonia nitrogen from tungsten smelting. Background technique [0002] Ammonium paratungstate (APT) is produced through the ion exchange method of tungsten smelting. The ammonia nitrogen waste gas produced during the smelting process is mainly produced in the APT crystallization condensate and part of the tail gas. The ammonia nitrogen wastewater is mainly produced in the ion exchange and APT crystallization processes in the APT production process. [0003] In the tungsten smelting process, the ion exchange method is used to produce APT, using NH concentration of 5mol / L 4 Cl and 2mol / L NH 2 OH solution is used to prepare analytical reagent. According to theoretical calculation, 0.41 ton of NH is consumed for each ton of APT produced. 4 Cl, but in actual production, it takes 0.6 to 0.65 tons of analytical agent to absorb the WO on the resin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/12C01C1/10
Inventor 谢泉文
Owner CNMC GUANGXI PGMA
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