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Method for preparing ferric chloride by spent pickling solution

A technology for polymerizing ferric chloride and pickling waste liquid, applied in the fields of environmental protection and environmental chemical industry, can solve the problems of low investment, pollution of pickling waste liquid, etc. Effect

Inactive Publication Date: 2006-06-21
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing polyferric chloride with pickling waste liquid, which not only solves the pollution problem of pickling waste liquid, but also produces inorganic water purifier chemical products with high added value, which has the advantages of low investment , quick effect, no secondary pollution, truly achieved the purpose of "using waste to waste, turning waste into treasure"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 600L of hydrochloric acid pickling waste liquid with an Fe(II) content of 165g / L, 19.8L of concentrated nitric acid with a concentration of 65-68%, and 80L of concentrated hydrochloric acid with a concentration of 36-38% into the corrosion-resistant reaction kettle, and fully stir , under the condition of 1.0 atmospheric pressure and continuous oxygen supply, control the temperature at about 90 ° C, react for 90 minutes, and obtain a basicity of 8 to 16%, a total iron content of 13.8%, Fe(II) <0.1% and stable performance Polyferric chloride products.

Embodiment 2

[0020] Add 600L of hydrochloric acid pickling waste liquid with a Fe(II) content of 145g / L, 16L of concentrated nitric acid with a concentration of 65 to 68%, and 70L of concentrated hydrochloric acid with a concentration of 36 to 38% in a corrosion-resistant reaction kettle, fully stir, Under the conditions of 1.2 atmospheric pressure and continuous oxygen flow, the temperature is controlled at about 95°C, and the reaction is carried out for 70 minutes to obtain a polyferric chloride product with a basicity of 8-16%, Fe(II)<0.1%, and stable performance.

Embodiment 3

[0022] Add 600L of hydrochloric acid pickling waste liquid with an Fe(II) content of 110g / L, 12L of concentrated nitric acid with a concentration of 65 to 68%, and 50L of concentrated hydrochloric acid with a concentration of 36 to 38% in a corrosion-resistant reaction kettle, fully stir, Under the conditions of 1.5 atmospheric pressure and continuous oxygen flow, the temperature is controlled at about 110°C, and the reaction is carried out for 60 minutes to obtain a polyferric chloride product with a basicity of 8-16%, Fe(II)<0.1%, and stable performance.

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Abstract

The invention discloses a process for preparing polymeric ferric chloride from acid waste liquid, which consists of charging hydrochloric acid waste liquid, concentrated nitric acid and hydrochloric acid into corrosion-resisting reactors, letting in oxygen under 1.0-3.0 normal atmosphere, controlling the temperature between 50-120 deg. C, and reacting 40-90 minutes.

Description

technical field [0001] The invention relates to a new process for preparing polyferric chloride by using hydrochloric acid pickling waste liquid by a catalytic oxidation method, and belongs to the technical fields of environmental chemical industry, environmental protection and the like. Background technique [0002] In the steel processing industry and the entire electroplating industry, it is often necessary to use hydrochloric acid to clean the surface of steel parts and electroplated parts to remove rust on the surface. During the pickling process, the hydrochloric acid in the hydrochloric acid washing solution is continuously consumed, and the ferrous ions therein are also continuously increased with the consumption of hydrochloric acid, until the hydrochloric acid washing solution no longer has a cleaning effect on the plated parts. The washing waste liquid produced at this time is the pickling waste liquid, and its main component is ferrous chloride solution. The was...

Claims

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Application Information

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IPC IPC(8): C01G49/10C02F1/72
Inventor 李明玉刘海叶唐启红
Owner JINAN UNIVERSITY
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