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Method for recycling lead-containing waste acid by utilizing adsorption method

A technology of resource utilization and adsorption method, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of lack of efficient and economically feasible industrialized treatment processes and constraints on sustainable development

Pending Publication Date: 2021-02-26
JIANGSU HELPER FUNCTIONAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In industries such as smelting, electroplating, mining, and metal surface processing, a large amount of inorganic acids such as nitric acid, hydrochloric acid, and sulfuric acid are used to clean the metal surface or leaching metal components, and a large part of the waste acid produced is lead-containing waste. So far, there is no efficient and economically feasible industrialized treatment process at home and abroad, which seriously restricts the sustainable development of the above industries

Method used

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  • Method for recycling lead-containing waste acid by utilizing adsorption method
  • Method for recycling lead-containing waste acid by utilizing adsorption method
  • Method for recycling lead-containing waste acid by utilizing adsorption method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Pack 20ml of pyrrolidone-based adsorption resin into an adsorption column (Φ35×250mm) with a heat preservation jacket.

[0022] Take waste hydrochloric acid with a lead chloride content of 2000mg / L, and use it as the upper column liquid after filtration; then, at 40°C, let the waste hydrochloric acid pass through the resin column at a flow rate of 1.5BV / h, so that the chlorination in the purified waste acid When the lead content is below 30mg / L, the treatment capacity is 5-8BV.

[0023] After the resin is adsorbed and saturated, it is desorbed with 4%-10% aqueous sodium hydroxide solution at a temperature of 20°C and a flow rate of 0.5BV / h.

[0024] Concentrated hydrochloric acid is added to the purified waste acid, and the water purifying agent is obtained after acidification.

[0025] The pH of the desorption waste liquid is adjusted by acid to convert sodium plumbate into lead hydroxide, which can be sold as a by-product after further treatment.

[0026] The pyrrol...

Embodiment 2

[0039] Pack 600ml of pyrrolidone-based adsorption resin into an adsorption column (Φ35×1000mm) with a heat preservation jacket.

[0040] Take the waste acid with a lead chloride content of 1000mg / L, and filter the waste acid as the upper column liquid; then, under the condition of 25°C, let the waste acid pass through the resin column at a flow rate of 0.5BV / h, so that the purified waste acid When the lead chloride content in the medium is below 30mg / L, the treatment capacity is 11-15BV.

[0041] After the resin is adsorbed and saturated, 4%-10% sodium hydroxide aqueous solution is used for desorption at a temperature of 20° C. and a flow rate of 1 BV / h.

[0042] Concentrated hydrochloric acid is added to the purified waste acid, and the water purifying agent is obtained after acidification.

[0043] The pH of the desorption waste liquid is adjusted by acid to convert sodium plumbate into lead hydroxide, which can be sold as a by-product after further treatment.

Embodiment 3

[0045] Pack 600ml of pyrrolidone-based adsorption resin into an adsorption column (Φ35×1000mm) with a heat preservation jacket.

[0046] Take the waste acid with a lead chloride content of 1000mg / L, and the waste acid is filtered as the upper column liquid; then, under the condition of 10°C, the waste acid is passed through the resin column at a flow rate of 3BV / h, so that the purified waste acid When the lead chloride content is below 30mg / L, the treatment capacity is 6-10BV.

[0047] After the resin is adsorbed and saturated, 4%-10% sodium hydroxide aqueous solution is used for desorption at a temperature of 25°C and a flow rate of 2BV / h.

[0048] Concentrated hydrochloric acid is added to the purified waste acid, and the water purifying agent is obtained after acidification.

[0049] The pH of the desorption waste liquid is adjusted by acid to convert sodium plumbate into lead hydroxide, which can be sold as a by-product after further treatment.

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Abstract

The invention discloses a method for recycling lead-containing waste acid by utilizing an adsorption method, and belongs to the technical field of wastewater treatment. According to the method for recycling the lead-containing waste acid through the adsorption method, lead chloride in raw water is enriched through cationic group adsorption resin or cation exchange resin and eluted through a desorbing agent to obtain a sodium plumbite solution, so that lead chloride is reduced to 30 mg / L or below from 3000 mg / L; the resin can be completely regenerated through a sodium hydroxide aqueous solutionafter performing adsorption, and the sodium plumbite solution in regenerated liquid can be recycled through fractional precipitation; and therefore, the waste acid treated by the method can be used as a water purifying agent after being subjected to subsequent acidification, so that waste recycling is realized while the waste acid is treated.

Description

technical field [0001] The invention relates to a technology in the field of waste water treatment, in particular to a method for recycling lead-containing waste acid by using an adsorption method. Background technique [0002] Lead (Pb) is a high-density, soft blue-gray metal, and zinc, silver, copper and other elements are often mixed in lead ore. Lead and its compounds have a wide range of uses, and they can be exposed to lead and its compounds in metallurgy, storage batteries, printing, pigments, paints, glazes, soldering and other operations. [0003] In industries such as smelting, electroplating, mining, and metal surface processing, a large amount of inorganic acids such as nitric acid, hydrochloric acid, and sulfuric acid are used to clean the metal surface or leaching metal components, and a large part of the waste acid produced is lead-containing waste. So far, there is a lack of efficient and economically feasible industrialized treatment processes at home and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F101/20
CPCC02F9/00C02F1/5245C02F1/001C02F1/42C02F1/66C02F2101/20
Inventor 蔡建国石洪雁龚向东
Owner JIANGSU HELPER FUNCTIONAL MATERIALS