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Process for producing high magnetic ferroferric oxide by galvanized pickle liquor

A technology of galvanized pickling waste liquid and ferric tetroxide, which is applied in the directions of iron oxide/iron hydroxide, ferrous oxide, chemical instruments and methods, etc. It is difficult to popularize and apply problems, and achieve the effect of high added value, wide source of raw materials, and easy industrial production.

Active Publication Date: 2012-10-31
QINGDAO XINZHONGJI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, the treatment process of above-mentioned various pickling waste liquids all has certain shortcoming and deficiency
Some will cause secondary pollution; some cannot recover acid; some have high investment costs and complicated process; some recovered iron compounds have low grades and narrow product sales, so it is difficult to popularize and apply

Method used

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  • Process for producing high magnetic ferroferric oxide by galvanized pickle liquor
  • Process for producing high magnetic ferroferric oxide by galvanized pickle liquor
  • Process for producing high magnetic ferroferric oxide by galvanized pickle liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Rust and iron were added to the iron-containing waste acid solution of a galvanizing plant to consume the free acid in the solution, and then filtered through a 800-mesh filter cloth. Transfer 240 ml of filtered filtrate to a reaction kettle, and add 160 ml of water to the reaction kettle for dilution. Turn on the heating device for heating, and turn on the stirring for slow stirring. When the heating temperature reaches 50°C, the stirring rate is controlled at 300r / min, and 3 mol L -1 200 ml of sodium hydroxide solution, the pH of the control solution is 6.0. Add polydimethyldipropylene ammonium chloride (0.5g) and 3-chloro-2-hydroxypropyltrimethylammonium chloride chitosan (0.5g) in turn to the reaction kettle. Air is introduced, and the air flow rate is controlled at 0.5 m 3 / h. When detecting Fe in the system 3+ with Fe 2+ When the molar ratio is 1.8, the aeration is stopped.

[0050] Add 20 ml 3 mol·L -1 Sodium hydroxide solution, control the pH of the solu...

Embodiment 2

[0054] Rust and iron were added to the iron-containing waste acid solution of a galvanizing plant to consume the free acid in the solution, and then filtered through a 800-mesh filter cloth. 480 ml of the treated filtrate was transferred to the reactor, and 320 ml of water was added to the reactor for dilution. Turn on the heating device for heating, and turn on the stirring for slow stirring. When the heating temperature reached 70°C, the stirring rate was controlled at 200r / min, and 3 mol L -1 205 ml of sodium hydroxide solution, the pH of the control solution is 6.5. 2-Hydroxypropyltrimethylammonium chloride chitosan (1.2 g) was added to the kettle. Air is introduced, and the air flow rate is controlled at 0.8 m 3 / h. When detecting Fe in the system 3+ with Fe 2+ When the molar ratio is 2.2, the aeration is stopped.

[0055] Add 20 ml 3 mol·L -1 sodium hydroxide solution, control the pH of the solution to 10.5, then add N, N ， - Sodium dipalmitoyl ethylenediamine d...

Embodiment 3

[0059] Rust and iron were added to the iron-containing waste acid solution of a galvanizing plant to consume the free acid in the solution, and then filtered through a 800-mesh filter cloth. Transfer 240 ml of filtered filtrate to a reaction kettle, and add 160 ml of water to the reaction kettle for dilution. Turn on the heating device for heating, and turn on the stirring for slow stirring. When the heating temperature reached 85 °C, the stirring rate was controlled at 100 r / min, and 3 mol L -1 200 ml of sodium hydroxide solution, the pH of the control solution is 6.0. Add polydimethyldipropenyl ammonium chloride (0.7g) and iodide N-trimethylammonium chloride chitosan (0.8g) in turn to the reaction kettle. Air is introduced, and the air flow rate is controlled at 1.0 m 3 / h. When detecting Fe in the system 3+ with Fe 2+ When the molar ratio is 2.1, the aeration is stopped.

[0060] Add 20 ml 3 mol·L -1 sodium hydroxide solution, control the pH of the solution to 10, a...

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Abstract

The invention discloses a process for producing high magnetic ferroferric oxide by a galvanized pickle liquor. The process includes the steps of (1) directly reacting an iron containing pickle liquor produced by a galvanizing factory and an iron containing excess rust to consume a free acid; (2) filtering by a filter cloth with 800 meshes; (3) using a filter liquor containing ferrous chloride as a raw material, diluting, heating, stirring, neutralizing until potential of hydrogen (pH) of a system reaches to 5.0 to 10.0, then adding an auxiliary, using a nitrite as a catalyst, feeding air, and when the molar ratio between Fe3+ and Fe2+ in the system is in a range from 1.8 to 2.2, stopping reacting; (4) adding an alkaline liquor to control the pH of the system in a range from 10 to 12, performing a heat preservation, stirring, adding the auxiliary, placing naturally, performing a solid-liquid separation, and recycling the filter liquor; and (5) washing, drying, sieving and packaging to obtain the product. The process for producing the high magnetic ferroferric oxide by the galvanized pickle liquor has the advantages that the investment is small, the production costs are low, the efficiency is high, the product quality is good, the complete resource-recovering processing of an iron containing acid pickle can be achieved, and the like.

Description

technical field [0001] The present invention relates to a resource treatment process of iron-containing waste acid liquid produced in the process of galvanizing plant, in particular to the comprehensive treatment of ferrous chloride-containing hydrochloric acid waste liquid and the preparation of high-magnetic ferroferric oxide magnetic powder The process belongs to the field of environmental protection technology of pollution control and emission reduction, resource conservation and recycling. Background technique [0002] A large amount of iron-containing waste acid liquid is produced in the process of hot-dip galvanizing of steel, which has been included in the "National List of Hazardous Wastes" because of its serious corrosion and hazards. It is very difficult to treat this kind of waste liquid. If it is directly discharged, it will not only seriously pollute the environment, but also cause a great waste of resources. Recycling of pickling waste liquid is one of the dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/08C02F9/04
Inventor 毕双玉王宁璨罗情丹张永彬
Owner QINGDAO XINZHONGJI ENVIRONMENTAL PROTECTION TECH
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