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Method for producing iron chloride by using steel pickling waste liquor

A technology for iron and steel pickling waste liquid and ferric chloride, which is applied in the direction of ferric halide and the like, can solve the problems that the quality of ferric chloride products cannot be guaranteed, the discharge standard cannot be met, and the salt content of the discharge water is high, and the acidity of the feed liquid can be achieved. The effect of reducing and reducing production costs and improving product quality

Active Publication Date: 2012-05-23
蓝保(厦门)水处理科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the treatment of these pickling waste liquids, some enterprises adopt the treatment method of sodium carbonate neutralization and discharge, which is expensive, and the discharge water has a high salt content, which cannot meet the discharge standards; some enterprises use nitric acid oxidation to produce chlorination Iron, but a large amount of nitrogen oxides will be produced in the production process, causing secondary pollution to the atmosphere, and the quality of the produced ferric chloride products cannot be guaranteed

Method used

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Examples

Experimental program
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Embodiment Construction

[0015] A kind of method utilizing iron and steel pickling waste liquor of the present invention to produce ferric chloride comprises the steps:

[0016] First, add 3000kg of steel pickling waste liquid into the pressure-resistant and acid-resistant reactor, raise the temperature to 50-60°C, open the decompression device connected to the reactor, control the negative pressure in the reactor to -0.08-0.15Mpa, and continue to decompress Control the density of the concentrated feed liquid to 1.45g / ml, stop decompression and concentration; the feed liquid enters the oxidation tank with a stirring device, and check the ferrous chloride content and free acid content in the intermediate inspection, add 100kg hydrochloric acid according to the intermediate inspection results, and start stirring Slowly add 120kg of 15% sodium chlorate solution and 80kg of 27.5% hydrogen peroxide solution at the same time under normal pressure, and control the temperature to ≤90°C through reaction self-he...

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Abstract

The invention relates to a method for producing iron chloride, in particular to a method for producing iron chloride by using steel pickling waste liquor. By reacting the steel pickling waste liquor with sodium chlorate and hydrogen peroxide, and adding an appropriate amount of synergistic agent, the invention can not only recycle the steel pickling waste liquor for utilization and avoid polluting the environment due to improper disposal, but also decrease the production cost of the iron chloride and avoid the harm to the environment and the safety risk to the production operating environmentdue to using other methods for producing the iron chloride.

Description

technical field [0001] The invention relates to a method for producing ferric chloride, in particular to a method for producing ferric chloride by utilizing waste iron and steel pickling liquid. Background technique [0002] The traditional ferric chloride production method is mainly the chlorination method: in a reaction vessel filled with dilute hydrochloric acid and iron filings, chlorine gas is introduced to react directly to produce ferric chloride products. Due to the large amount of chlorine used in this production method, not only the production cost is high, the equipment is corroded seriously, and the operating conditions are bad, but also the chlorine in the tail gas will cause great harm to the environment. [0003] On the other hand, in the production process of iron and steel enterprises, a large amount of pickling waste liquid will be produced, the main components of which are ferrous chloride and hydrochloric acid. For the treatment of these pickling waste l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/10
Inventor 吕奋志吕奋勇王志巍
Owner 蓝保(厦门)水处理科技有限公司