Method for reclaiming lead from waste water

A waste water and purpose technology, applied in the field of lead waste water treatment, can solve the problems of high price and toxicity

Inactive Publication Date: 2010-05-26
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

These reagents are either expensive or toxic

Method used

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  • Method for reclaiming lead from waste water

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Embodiment Construction

[0006] The present invention first adopts L113A as surfactant, uses N7301 as carrier, uses industrial kerosene as film solvent, and takes acidic solution as internal water phase to prepare emulsion; secondly, the prepared emulsion is dispersed in lead-containing waste water, by contacting waste water The lead in the liquid is transferred to the internal phase liquid through the liquid film, and is enriched in the internal phase liquid; through static layering, the loaded emulsion is electrostatically demulsified, the oil phase is used to re-prepare the emulsion, and the internal phase of the concentrated lead The phase solution is used to prepare lead salts.

[0007] The present invention is achieved through the following technical solutions, including the following specific steps:

[0008] 1. Preparation of emulsion

[0009] (1) In an emulsifying cup, dissolve 3-5% (v / v) of L113A surfactant and 3-5% (v / v) of N7301 carrier in kerosene film solvent.

[0010] (2) While stirrin...

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Abstract

The invention aims to provide a method for reclaiming lead from waste water by using an emulsion membrane, and belongs to the field of environmental chemical engineering. The method comprises the following steps: (1) preparing an emulsion by stirring L113A serving as surfactant, N7301 serving as a carrier for conveying the lead, industrial kerosene serving as a membrane solvent and acid solution serving as an internal water phase at a high speed; (2) dispersing the emulsion to the lead-containing waste water, separating the lead-containing waste water at a low rotating speed, conveying the lead from the waste water phase to the internal water phase through a liquid membrane, enriching the lead, standing the waste water, and then separating the lead-loaded emulsion and the waste water; and (3) breaking the lead-loaded emulsion under high-voltage static electricity, and separating the oil phase and the aqueous phase, wherein the oil phase is used for cyclically preparing the emulsion, and the aqueous phase is the concentrated lead-containing solution. The method provided by the invention has the characteristics that: (1) the emulsion has good stability; (2) the adopted carrier has the advantages of good selectivity for lead ions, high separation efficiency, low price, easy synthesis and the like; and (3) the reclaimed lead can be reused so as not to cause secondary pollution.

Description

Technical field: [0001] The patent of the present invention relates to the treatment of lead-containing wastewater, which uses emulsion liquid film technology to recycle the lead in the wastewater to achieve the purpose of wastewater treatment, and belongs to the field of environmental chemical industry. Background technique: [0002] Heavy metal pollution is one of the public hazards the world is facing, and it is designated as the first category of pollutants. Heavy metals are extremely harmful to organisms. Once they enter the environment, they are difficult to degrade, easily migrate from one system to another, and accumulate in organisms. Lead is an important industrial raw material that exists in various industrial wastewaters. However, lead is also a toxic heavy metal, which can damage the digestive system, blood system and nervous system of the human body. The high lead content in industrial wastewater has caused great harm to the environment and seriously threaten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00C02F1/26C02F1/62C02F101/20
Inventor 李红霞张俊杰王红
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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