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Rare earth oxide production wastewater treatment and rare earth recycling process

A technology for rare earth oxides and production wastewater, applied in special compound water treatment, metallurgical wastewater treatment, water/sewage treatment, etc. Effect

Inactive Publication Date: 2017-06-30
新干县鑫吉新资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of this treatment method is not good, and the energy consumption is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use the rare earth precipitation mother liquor wastewater to adjust the pH of the saponification wastewater to 4, separate out free rare earth ions and oxalate ions, and break the emulsion, and use ultrasonic waves to assist the emulsion breakdown. After standing for 2 hours, collect the slick oil for recovery of the extraction agent, and collect the solid for precipitation. Used to recover rare earths to obtain oil-removing saponification wastewater;

[0025] The raffinate wastewater is adjusted to pH 4 with the rare earth precipitation mother liquor wastewater, the emulsion is broken, and the slick oil is collected for recovery of the extractant to obtain the oil-removed raffinate wastewater;

[0026] Mix oil-removing saponification wastewater, oil-removing raffinate wastewater with the remaining rare earth precipitation mother liquor wastewater, add sodium hydroxide solution, adjust the pH to 6, then add non-ionic polyacrylamide for flocculation, and sand filter to se...

Embodiment 2

[0029] The pH of the saponification wastewater is adjusted to 4 with the rare earth precipitation mother liquor wastewater, and the free rare earth ions and oxalate ions are separated out, and the emulsion is broken. After standing for 2 hours, the slick oil is collected for the recovery of the extraction agent, and the solid precipitation is collected for the recovery of the rare earth. Oil saponification wastewater;

[0030] The raffinate wastewater is adjusted to a pH of 3 with the rare earth precipitation mother liquor wastewater, the emulsion is broken, and the slick oil is collected for recovery of the extractant to obtain the oil-removed raffinate wastewater;

[0031] Mix oil-removing saponification wastewater, oil-removing raffinate wastewater with the remaining rare earth precipitation mother liquor wastewater, add sodium hydroxide solution, adjust the pH to 6, then add non-ionic polyacrylamide for flocculation, and sand filter to separate the filter residue and clarif...

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PUM

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Abstract

The invention relates to the technical field of rare earth processing, and particularly relates to a rare earth oxide production wastewater treatment and rare earth recycling process. PH values of saponified wastewater and extraction wastewater are respectively adjusted to be less than 4 with rare earth precipitation mother liquid wastewater, after standing for 2 h, floating oil is collected and is used for recycling extraction agents, deoiled saponified wastewater and deoiled extraction wastewater are mixed with residual rare earth precipitation mother liquid wastewater, after flocculation, carbon microspheres loaded with TiO2 are added to clear mixed wastewater so as to adsorb rare earth and degrade organic matter, finally, the carbon microspheres are filtered and recycled, and extraction washing wastewater is directly mixed with hydrochloric acid so as to prepare into reverse extraction liquid for reverse extraction. Wastewater generated in the production process of rare earth oxide is classified so as to be treated according to different characteristics of the wastewater, the treatment efficiency is high, a part of wastewater can be recycled after being pretreated, and additionally, the rare earth in the wastewater is recycled, so that the waste of resources is reduced, the waste discharge standard is satisfied, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of rare earth processing, in particular to a rare earth oxide production wastewater treatment and rare earth recycling process. Background technique [0002] At present, domestic NdFeB waste rare earth recovery processes mainly include double salt conversion process, fluoride precipitation method, total dissolution method, oxidation roasting-hydrochloric acid dissolution, etc. Among them, oxidation roasting-hydrochloric acid dissolution method is widely used in industrial production, using hydrochloric acid -Recovery of rare earths by excellent solution method, that is, roasting, ball milling + excellent solution + P 5 o 7 (Sodium soap)-kerosene-HCl system extraction and separation+precipitation+drying and burning process to recycle neodymium, praseodymium, dysprosium, terbium and other products in the waste, and oxidize iron and rare earth metals in the NdFeB waste into Fe by roasting 2 o 3 and RE 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00C02F9/04C02F101/30C02F103/16
CPCC02F1/001C02F1/281C02F1/36C02F1/40C02F1/56C02F1/66C02F9/00C02F2101/30C02F2103/16C02F2305/023C02F2305/10C22B7/006C22B59/00Y02P10/20
Inventor 徐浩卢文庆刘钦钢
Owner 新干县鑫吉新资源有限公司