Method for recycling and processing pickling waste liquid containing iron

A recovery treatment and pickling technology, applied in metallurgical wastewater treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of large sewage discharge, high cost, difficult recycling, etc., and achieve recycling, equipment The effect of low requirements and single processing technology

Active Publication Date: 2018-08-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art of treating waste acidic waste liquid containing iron for cleaning, there is a large amount of sewage discharge, high cost, and difficulty in recycling, and proposes a method for recycling and treating waste acid liquid containing iron

Method used

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  • Method for recycling and processing pickling waste liquid containing iron
  • Method for recycling and processing pickling waste liquid containing iron
  • Method for recycling and processing pickling waste liquid containing iron

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: the hydrochloric acid waste liquid recovery treatment that contains 5.6g / L iron ion 6mol / L

[0039]Treatment method: Add 1ml of 0.5mol / L tetrabutylammonium chloride solution to 5ml of waste hydrochloric acid solution containing 5.6g / L iron ion and 6mol / L, mix well and stir for 2 hours, yellow insoluble acid appears precipitation. After the mixture in the reaction tank was allowed to settle for 2 hours, it was subjected to suction filtration. Add 0.1 g of activated carbon to the filtrate for adsorption. The concentration of hydrochloric acid in the filtrate was measured to be 4.85 mol / L, and the removal rate of iron ions was 93.6%. It was recovered and used as a cleaning solution; the filter residue was roasted at 500°C for 5 hours to obtain iron oxide, which was recovered.

Embodiment 2

[0040] Embodiment 2: the hydrochloric acid waste liquid recovery treatment of the 6mol / L that contains 84g / L iron ion

[0041] Treatment method: Add 2.084g of tetrabutylammonium chloride to 5ml of waste hydrochloric acid solution containing 84g / L iron ion and 6mol / L, mix thoroughly for 2 hours, and a yellow insoluble acid-soluble precipitate appears. After the mixture in the reaction tank was allowed to settle for 2 hours, it was subjected to suction filtration. Add 0.1 g of activated carbon to the filtrate for adsorption. The concentration of hydrochloric acid in the filtrate was measured to be 4.56 mol / L, and the removal rate of iron ions was 99.3%. It was recovered and used as a cleaning solution; the filter residue was roasted at 500°C for 5 hours to obtain iron oxide, which was recovered.

Embodiment 3

[0042] Embodiment 3: the hydrochloric acid waste liquid recovery treatment of the 6mol / L that contains 5.6g / L iron ion

[0043] Treatment method: Add 1ml of 0.5mol / L tetrapropylammonium chloride solution to 5ml of waste hydrochloric acid solution containing 5.6g / L iron ion and 6mol / L, mix thoroughly for 2 hours, and a yellow insoluble acid-soluble precipitate appears . After the mixture in the reaction tank was allowed to settle for 5 hours, suction filtration was performed. Add 0.1 g of activated carbon to the filtrate for adsorption, the hydrochloric acid concentration in the filtrate was measured to be 4.89 mol / L, and the removal rate of iron ions was 48.1%, which was recovered and used as a cleaning solution; the filter residue was roasted at 500°C for 5 hours to obtain iron oxide, which was recovered.

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Abstract

The invention discloses a method for recycling and processing pickling waste liquid containing iron and aims to overcome defects that a currently common pickling waste liquid processing method is large in discharge quantity and high in processing cost, and the concentration of the recycled acid liquid is lowered greatly. The method is characterized in that by controlling process parameters, quaternary ammonium salt and Fe<3+> ions are allowed to generate precipitates insoluble in acid in an acid environment, the metal ions are effectively separated from the acid liquid, and pickling solution recycling is achieved. The method is simple in processing process, low in equipment requirement, low in investment cost, small in acid concentration change before and after the processing, capable of recycling the waste acid and Fe<3+>, capable of achieving zero emission in the whole processing process, and extremely high in environment value and economic value.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for recycling and treating iron-containing waste pickling liquid. Background technique [0002] Cleaning metal surfaces with acid is an integral part of the manufacturing process. During the production process of the manufacturing industry, the oxides on the surface of metal materials are usually removed. The best way to remove oxides on the surface of metal materials is to soak them in acid solution or spray acid solution on the surface to dissolve the oxides in the acid to achieve the purpose of cleaning. During the use of acid cleaning solution, due to the dissolution of metal oxides, the concentration of metal ions in the acid will increase. If cleaning steel materials, the acid contains Fe 3+ . When Fe 3+ When the concentration reaches a certain value, it will have a corrosive effect on the cleaned steel materials. At this time, the acid cleaning solution c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C23G1/08C23G1/36C02F101/20C02F103/16
CPCC02F1/28C02F1/54C02F2101/203C02F2103/16C23G1/08C23G1/081C23G1/36
Inventor 何凤姣潘丹
Owner HUNAN UNIV
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