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Method for recycling lead-containing waste acid

A technology for acid recovery and waste acid, applied in chemical instruments and methods, improvement of process efficiency, multi-stage water treatment, etc., can solve the problems of low recovery rate and recovery purity of lead-containing waste acid, and achieve excellent economy and environmental protection The effect of safety, saving recycling cost, and complete separation

Inactive Publication Date: 2019-04-16
CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the defects and deficiencies of the existing lead-containing waste acid recycling rate and recovery purity are not high, and provide a method for recycling lead-containing waste acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the lead-containing waste acid of this embodiment, the content of ferric iron is 0.59% in terms of Fe, the content of divalent iron is 11.57% in terms of Fe, the content of HCl is 1.03%, and the content of lead ions is 2744 ppm.

[0035] A method for recycling lead-containing waste acid, comprising the steps:

[0036] S1. Ferric iron reduction: add iron filings to lead-containing waste acid to reduce ferric iron to ferrous iron, stir at room temperature for 80 minutes, and then filter by plate and frame to obtain a yellow-green clear lead-containing ferrous chloride solution, in which iron filings The addition amount is 2% of the quality of lead-containing waste acid;

[0037] S2. Lead extraction: add an extractant to the lead-containing ferrous chloride solution in S1, and extract to obtain a lead organic phase and a ferrous chloride solution. % (mass fraction) dinonylnaphthalene sulfonic acid, 60% (mass fraction) sulfonated kerosene, the amount of extraction agent...

Embodiment 2

[0040] In the lead-containing waste acid of this embodiment, the content of ferric iron is 1.20% in terms of Fe, the content of divalent iron is 12.54% in terms of Fe, the content of HCl is 4.37%, and the content of lead ions is 1536 mg / L.

[0041] A method for recycling lead-containing waste acid, comprising the steps:

[0042] S1. Ferric iron reduction: add iron filings to lead-containing waste acid to reduce ferric iron to ferrous iron, stir at room temperature for 95 minutes, and then filter by plate and frame to obtain a yellow-green clear lead-containing ferrous chloride solution, in which iron filings The added amount is 5% of the quality of lead-containing waste acid;

[0043] S2. Lead extraction: add an extractant to the lead-containing ferrous chloride solution in S1, and extract to obtain a lead organic phase and a ferrous chloride solution. % (mass fraction) dinonylnaphthalene sulfonic acid, 50% (mass fraction) sulfonated kerosene, the amount of extraction agent a...

Embodiment 3

[0046] In the lead-containing waste acid of this embodiment, the content of ferric iron is 0.73% in terms of Fe, the content of divalent iron is 7.86% in terms of Fe, the content of HCl is 8.31%, and the content of lead ions is 994 mg / L.

[0047] A method for recycling lead-containing waste acid, comprising the steps:

[0048] S1. Ferric iron reduction: add iron filings to lead-containing waste acid to reduce ferric iron to ferrous iron, stir at room temperature for 95 minutes, and then filter by plate and frame to obtain a yellow-green clear lead-containing ferrous chloride solution, in which iron filings The added amount is 7.5% of the quality of lead-containing waste acid;

[0049] S2. Lead extraction: add an extractant to the lead-containing ferrous chloride solution in S1, and extract to obtain a lead organic phase and a ferrous chloride solution. % (mass fraction) dinonylnaphthalene sulfonic acid, 65% (mass fraction) sulfonated kerosene, the amount of extraction agent a...

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Abstract

The invention discloses a method for recycling lead-containing waste acid. The lead-containing waste acid processed by the method is waste hydrochloric acid and includes iron ions and lead ions. The method comprises the following steps of trivalent iron reduction, lead extraction and nitric acid reverse extraction of lead. According to the method, the trivalent iron is reduced into divalent ferricchloride, then, a mixture of di phosphate and dinonylnaphthalene sulfonic acid is adopted as an extracting agent for lead extraction, nitric acid with the specific concentration is adopted as a reverse extraction agent, lead and iron are efficiently and completely separated, the content of lead ions of the recycled ferric chloride solution is lower than 8 ppm, the related standard requirement forthe ferric chloride purifying agent is met, the iron ion recycling rate is also 99% or above, the content of lead ions in the organic extracting agent obtained after reverse extraction is lower than30 ppm, the method is recyclable, the recycling cost is saved, the comprehensive recycling value of the lead-containing waste acid is increased, and the method has the excellent economy and environment-friendliness.

Description

technical field [0001] The invention relates to the technical field of waste acid recycling, and more particularly, to a method for recycling lead-containing waste acid. Background technique [0002] Lead is a widely distributed element in nature and one of the elements commonly used in industry. During the etching process of lead-containing materials, a large amount of lead-containing waste acid is generated. The waste liquid contains a large amount of waste hydrochloric acid and metal elements such as iron and lead, which are harmful to the environment and cannot be used directly. Generally, lime soda ash is used to neutralize the precipitate and zeolite. With ceramsite adsorption and ion exchange treatment methods, the treated wastewater is discharged up to the standard or enters the subsequent treatment process, but a large amount of secondary hazardous waste is generated during the treatment process, the disposal cost is high, and the overall treatment process of waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C22B7/00C22B13/00C02F101/20
CPCC02F1/26C02F1/70C02F9/00C02F2101/20C02F2301/08C22B7/00C22B13/00Y02P10/20
Inventor 蒋浩蒋银锋居银栋朱松锋朱海栋黄珊
Owner CHANGZHOU WUJIN YOUBANG WATER PURIFICATION MATERIALS
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