Method for recycling waste ammonia water

A technology for recycling and processing ammonia water, which is used in water/sewage treatment, water/sludge/sewage treatment, and ammonia preparation/separation. Material consumption, the realization of economic and social benefits, the effect of reducing the impact of the environment

Active Publication Date: 2014-04-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the methods and patents listed above are currently representative waste ammonia treatment methods, their common disadvantage is that they all require a long process and a large number of new equipment to achieve, so it is impossible to use existing equipment to reduce waste ammonia. The purpose of ammonia recovery and comprehensive utilization

Method used

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  • Method for recycling waste ammonia water
  • Method for recycling waste ammonia water
  • Method for recycling waste ammonia water

Examples

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Effect test

Embodiment 1

[0030] see figure 2 , image 3 , the waste ammonia recovery process flow of the present invention is as follows:

[0031] 1) Add desalted water or pure water to the ammonia release pool.

[0032] 2) After the ammonia gas is passed into the ammonia release tank, start to sample and test the waste ammonia water in the tank, and continuously add desalted water or pure water to the tank during this process until the concentration of the waste ammonia water is lower than 10wt%. At the same time, the suspended particle content in the waste ammonia water When it drops below 10mg / l, stop adding desalted water or pure water at this time, and use a tank truck to pump out the waste ammonia water for later use.

[0033] 3) Add a filter before the ammonia discharge pump of the acid regeneration unit and before the ammonia water metering pump, and the filtration accuracy is required to be less than 100 μm.

[0034] 4) The waste ammonia water is injected into the ammonia water storage ta...

Embodiment 2

[0039] Example 2: Utilize waste ammonia to neutralize and remove silica in waste hydrochloric acid

[0040] 1. Heat waste hydrochloric acid to 70°C and react with a large amount of steel scrap to generate ferrous chloride and hydrogen: 2HCl+Fe=FeCl 2 +H 2 ↑.

[0041] 2, ferrous chloride solution is cooled to 40 DEG C, and wherein the waste ammonia water that process of the present invention is generated is added, and waste ammonia water addition is 0.018wt% (mass percentage) of ferrous chloride amount, generates ferrous hydroxide : FeCl 2 +2NH 3 ·H 2 O=Fe(OH) 2 +2NH 4 Cl.

[0042] 3. Blow compressed air into ferrous hydroxide to oxidize it into ferric hydroxide, which is a sol-like substance, which can capture and precipitate silicon dioxide in waste hydrochloric acid to achieve the effect of desiliconization. The pure ferrous chloride in the upper layer of the solution can be used as the raw material of the acid regeneration unit.

[0043] As a common unit in the col...

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Abstract

The invention relates to a method for recycling waste ammonia water. The method includes continuously adding desalted water or pure water into the waste ammonia water produced in the purification and distillation processes of liquid ammonia to properly control density of the waste ammonia water, filtering suspended matter in the waste ammonia water to obtain processed waste ammonia water and enabling the processed waste ammonia water to serve as a process addition medium of an acid regeneration unit. Accordingly, the method reduces outsourced processing of the waste ammonia water, simultaneously reduces production operation cost and environment burden, is simple in process implementation and convenient to apply, achieves the aims of reducing material consumption and recycling wastes and simultaneously achieves double benefits of economical benefits and social benefits.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of waste, in particular to a method for recycling and treating waste ammonia water. Background technique [0002] Grain-oriented silicon steel needs to be surface nitrided during the production process. In order to meet the technological needs of the unit, Nengjie Workshop adopts a purification distillation process, that is, the purchased ammonia water needs to be distilled and purified into ammonia gas before being used by the unit. During the purification process, a considerable part of waste ammonia will be produced. Ammonia is a colorless gas with a pungent and foul odor, which has a strong corrosive effect on the upper respiratory tract of the human body. In order to avoid the impact of ammonia leakage on the environment, the current treatment method is to use the characteristics of ammonia gas soluble in water, use industrial water to absorb ammonia gas, generate waste ammonia water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02C02F1/00
Inventor 宋俊邢启宏陶登国韩卫国
Owner BAOSHAN IRON & STEEL CO LTD
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