Method for recycling rare earth extraction residual wastewater with high sodium salt content

A waste water, high sodium technology, applied in metallurgical waste water treatment, chemical instruments and methods, heating water/sewage treatment, etc., to achieve the effects of low cost, good social benefits, and easy operation

Inactive Publication Date: 2016-09-28
CHALCO GUANGXI RARE EARTH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing in the recovery and treatment of sodium salt wastewater produced in the existing rare earth extraction process, and provides a method for recycling rare e

Method used

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  • Method for recycling rare earth extraction residual wastewater with high sodium salt content
  • Method for recycling rare earth extraction residual wastewater with high sodium salt content
  • Method for recycling rare earth extraction residual wastewater with high sodium salt content

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The sodium salt wastewater discharged from the production process of a company's rare earth separation project was used as the raw water in this embodiment.

[0032] A method for recovering rare earth raffinate high-sodium salt wastewater, comprising the following steps:

[0033] (1) Oil separation: discharge the rare earth raffinate high-sodium salt wastewater into the grease trap, and after standing for 3 hours to separate layers, recover the P507 extractant to obtain crude sodium-salt wastewater;

[0034] (2) Demulsification reaction: the thick sodium salt wastewater obtained in step (1) is passed through a demulsification reaction bed, and SP-169 demulsifier is added to carry out a demulsification reaction, and the emulsion is removed to obtain degreasing sodium salt wastewater;

[0035] (3) Chemical precipitation reaction: add a sodium hydroxide solution with a concentration of 1mol / L to the deoiled sodium salt wastewater, adjust the pH to 8.5, and then add polyacr...

Embodiment 2

[0043] The sodium salt wastewater discharged from the production process of a company's rare earth separation project was used as the raw water in this embodiment.

[0044] A method for recovering rare earth raffinate high-sodium salt wastewater, comprising the following steps:

[0045] (1) Oil separation: discharge the rare earth raffinate high-sodium salt wastewater into the grease trap, and after standing for 2.5 hours to separate layers, recover the P507 extractant to obtain crude sodium-salt wastewater;

[0046] (2) Demulsification reaction: the thick sodium salt wastewater obtained in step (1) is passed through a demulsification reaction bed, and AP-221 demulsifier is added to carry out a demulsification reaction, and the emulsion is removed to obtain degreasing sodium salt wastewater;

[0047](3) Chemical precipitation reaction: add sodium hydroxide solution with a concentration of 2 mol / L to the deoiled sodium salt wastewater, adjust the pH to 9, and then add sodium li...

Embodiment 3

[0055] The sodium salt wastewater discharged from the production process of a company's rare earth separation project was used as the raw water in this embodiment.

[0056] A method for recovering rare earth raffinate high-sodium salt wastewater, comprising the following steps:

[0057] (1) Oil separation: discharge the rare earth raffinate high-sodium salt wastewater into the grease trap, and after standing for 2 hours to separate layers, recover the P507 extractant to obtain crude sodium-salt wastewater;

[0058] (2) Demulsification reaction: the thick sodium salt wastewater obtained in step (1) is passed through the demulsification reaction bed, and AE-169 demulsifier is added to carry out the demulsification reaction, and the emulsion is removed to obtain deoiled sodium salt wastewater;

[0059] (3) Chemical precipitation reaction: add sodium hydroxide solution with a concentration of 1.5mol / L to the deoiled sodium salt wastewater, adjust the pH to 8.5, and then add sodium...

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Abstract

The invention discloses a method for recycling rare earth extraction residual wastewater with a high sodium salt content. The method includes steps of removing oil; breaking emulsion; adding sodium hydroxide and flocculating agents into the rare earth extraction residual wastewater and carrying chemical precipitation reaction; carrying out sand filtration treatment; adsorbing and removing heavy metal and radioactive elements by the aid of pyrolusite; carrying out concentration and crystallization by the aid of triple-effect evaporation devices. The method has the advantages that the method is low in cost and energy consumption, easy and convenient to implement, free of pollution and high in sodium chloride recycling rate and is environmentally friendly, and processes are simple; rare earth extraction residual wastewater pollution-free discharge effects can be realized, sodium chloride and water can be sufficiently recycled, resources can be reused, accordingly, the method has excellent social, ecological and economical benefits, and the like.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a method for recovering rare earth raffinate high-sodium salt wastewater. Background technique [0002] my country is rich in rare earth reserves and has the world's largest rare earth reserves and output. Rare earths have become a new type of material in the 21st century. They have good chemical and physical properties, optical properties, electrical properties, magnetic properties and catalytic properties. They are widely used in military affairs. , chemical industry, glass ceramics and agriculture and other industries. The development and utilization of rare earth has penetrated into all walks of life in human society, and will be a new technological revolution in the future world. The rare earth extraction and separation process can be divided into three aspects, namely, feed liquid pre-treatment, solvent extraction and separation process, and product ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/16
CPCC02F1/04C02F1/28C02F1/40C02F1/56C02F9/00C02F2103/16
Inventor 韦世强秦文忠胡振光娄战荒蒋超超麻华贤
Owner CHALCO GUANGXI RARE EARTH DEV CO LTD
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