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A method for reclaiming and treating waste pickling liquid containing iron

A recycling and pickling technology, applied in metallurgical wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. Realize the effect of recycling and processing process orders

Active Publication Date: 2021-04-09
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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  • A method for reclaiming and treating waste pickling liquid containing iron
  • A method for reclaiming and treating waste pickling liquid containing iron
  • A method for reclaiming and treating waste pickling 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, and yellow insoluble 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 treating scrap pickling liquid containing iron. Aiming at the drawbacks of the currently commonly used pickling waste liquid treatment methods, such as large discharge volume, high processing cost, and greatly reduced acid recovery concentration, the inventors controlled the process parameters to make the quaternary ammonium salt react with Fe in an acidic environment. 3+ The ions generate acid-insoluble precipitates, effectively separate the metal ions from the acid solution, and realize the recycling of the pickling solution. The treatment process of the present invention is simple, requires low equipment, low investment cost, little change in acid concentration before and after treatment, not only realizes the recycling of scrap acid, but also realizes Fe 3+ Recycling, the whole process can achieve zero discharge, which has great environmental 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, it is usually necessary to remove the oxides on the surface of the metal material. 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 cl...

Claims

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Application Information

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Patent Type & Authority Patents(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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