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Method for recovering ammonia from ammonia waste water

A technology for recovering ammonia and waste water, applied in the field of ammonia recovery, which can solve problems such as difficulty in ammonia removal, environmental pollution, waste of ammonia resources, etc.

Active Publication Date: 2008-01-09
HENAN KELONG NEW ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the industrial wastewater containing alkali and ammonia produced in the production of the battery industry, the insoluble alkali is easily separated out, but the removal of ammonia is difficult, so various enterprises directly discharge the industrial wastewater containing ammonia, which pollutes the environment and at the same time A waste of ammonia resources

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  • Method for recovering ammonia from ammonia waste water

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Embodiment Construction

[0005] Ammonia recovery method of the present invention has following steps:

[0006] (1) The ammonia-containing wastewater is sent to a centrifugal separator to separate the water-insoluble alkali in the wastewater to obtain ammonia wastewater without solid alkali.

[0007] (2) above-mentioned ammonia-containing waste water is sent to carry out fractional distillation and cooling to obtain pure ammoniacal liquor (18%-25%) in the bubble-cap type rectifying tower, returns to production line and reuses; The ammonia content in the waste water after rectification exceeds Environmental protection standard, can be discharged directly. Distillation process parameters: vapor pressure 0.1-0.5Mpa, waste water flow 2-5M 3 / h, the liquid level in the tower is 1000-2000mm, and the wastewater temperature is 90-110°C. The bubble-cap type rectification column used is a patented product, and the patent number is ZL922327009.

[0008] The results of chemical analysis of ammonia wastewater tr...

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Abstract

The invention discloses a method for recovering ammonia from waste ammonia water, belonging to a separating technique. The invention resolves the technical problem of making ammonia content of the waste-water lower than the environmental protection effluent standard. The invention feeds ammonia-containing waste water into a centrifuger to separate alkali that does not dissolving in water from the waste water, so as to obtain waste ammonia water without solid alkali; and feeding the waste ammonia water without solid alkali into a bubble-plate rectifying tower for rectification and then cooling and obtaining pure ammonia water, which returns to the production line for being reused, where the ammonia content of the distilled waste water is lower than the environmental protection effluent standard so that the distilled waste water can be directly discharged, and the distilling parameters are as follows: steam pressure 0.1-0.5 MPa, waste water flow 2-5 cu M / h, in-tower liquid surface height 1000-2000mm, and waste water temperature 90-110 deg.C. The invention can be used to recover and discharge the solid alkali-containing waste ammonia water.

Description

technical field [0001] The invention relates to a separation technology, in particular to a method for recovering ammonia from ammonia waste water containing impurities such as alkali and salt. Background technique [0002] In the industrial wastewater containing alkali and ammonia produced in the production of the battery industry, the insoluble alkali is easily separated out, but the removal of ammonia is difficult, so various enterprises directly discharge the industrial wastewater containing ammonia, which pollutes the environment and at the same time Ammonia resources are wasted. Contents of the invention [0003] The technical problem to be solved in the present invention is to design a method for recovering ammonia from ammonia waste water, which can recycle and reuse the ammonia in the waste water, so that the ammonia content in the discharged waste water meets the environmental protection standard. The technical solution of the present invention to solve the abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02
Inventor 程清丰康保家原建军王其昌杜习义尹正中吴长军徐拥军刘振奇张鸿发
Owner HENAN KELONG NEW ENERGY CO LTD
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