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Rare earth heavy metal waste liquid treatment method

A waste liquid treatment and heavy metal technology, applied in multi-stage water treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems such as environmental pollution, resource loss, and loss of precious rare earth resources

Active Publication Date: 2017-01-04
BEIJING TINGRUN MEMBRANE TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydrochloric acid is usually used to extract rare earths in the production of silicon industry, and the problem of resource loss caused by the development of rare earths by hydrochloric acid method has become increasingly prominent; it is reported that China’s rare earth production in recent years has been 120,000 tons per year, and the extraction rate is the highest. Reaching about 97%, that is, as many as 4,000 tons of rare earths are lost with wastewater in a low-concentration state. The discharge of these rare earth-containing wastewater has caused the loss of precious rare earth resources on the one hand, and caused environmental pollution on the other hand.

Method used

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Experimental program
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Effect test

Embodiment 1

[0024] like figure 1 Shown, a kind of rare earth heavy metal waste liquid processing method of the present invention comprises the steps:

[0025] S01: Diffusion dialysis; pass the waste liquid into the diffusion dialysis unit to separate hydrochloric acid from the waste liquid, and the hydrochloric acid obtained by dialysis can be returned to figure 1 In the production of the silicon industry shown; the composition of the waste liquid after acid removal by diffusion dialysis is: H 2 O 95.84%, HCl 1.59%, ScCl 0.39%, others 2.18%;

[0026] S02: preprocessing, including the following steps:

[0027] S021: Alkali neutralization; pass the waste liquid into the alkali neutralization unit for 10 minutes of treatment, so that the rare earth heavy metal ions in the waste liquid and OH - Combine to form Sc(OH) 3 Precipitation, so that the rare earth heavy metal element Sc is extracted from the waste liquid;

[0028] S022: nanofiltration separation; pass the waste liquid into the n...

Embodiment 2

[0034] like figure 1 Shown, a kind of rare earth heavy metal waste liquid processing method of the present invention comprises the steps:

[0035] S01: Diffusion dialysis; pass the waste liquid into the diffusion dialysis unit to separate hydrochloric acid from the waste liquid, and the hydrochloric acid obtained by dialysis can be returned to figure 1 In the production of the silicon industry shown; the composition of the waste liquid after acid removal by diffusion dialysis is: H 2 O 96.26%, HCl 1.47%, ScCl 0.46%, others 1.81%;

[0036] S02: preprocessing, including the following steps:

[0037] S021: Alkali neutralization; pass the waste liquid into the alkali neutralization unit for continuous 90min treatment, so that the rare earth heavy metal ions in the waste liquid and OH - Combine to form Sc(OH) 3 Precipitation, so that the rare earth heavy metal element Sc is extracted from the waste liquid;

[0038] S022: Nanofiltration separation; pass the waste liquid into th...

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Abstract

The invention provides a rare earth heavy metal waste liquid treatment method, relates to the field of wastewater treatment, and aims at providing a clean production method for achieving heavy metal wastewater zero discharging. The rare earth heavy metal waste liquid treatment method comprises the following steps of 01 diffusing dialysis; 02 pretreatment, wherein pretreatment comprises the following steps of 021 alkali neutralization, 022 nanofiltration and separation, 023 SS adsorption, 024 Na resin softening and 025 homogeneous electrodialysis; 03 bipolar membrane electrodialysis.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for treating rare earth and heavy metal waste liquid. Background technique [0002] Hydrochloric acid is usually used to extract rare earths in the production of silicon industry, and the problem of resource loss caused by the development of rare earths by hydrochloric acid method has become increasingly prominent; it is reported that China’s rare earth production in recent years has been 120,000 tons per year, and the extraction rate is the highest. Reaching about 97%, that is, as many as 4,000 tons of rare earths are lost with wastewater in a low-concentration state. The discharge of these rare earth-containing wastewater has caused the loss of precious rare earth resources on the one hand, and caused environmental pollution on the other hand. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C22B59/00C22B7/00
CPCC02F1/281C02F1/42C02F1/44C02F1/442C02F1/4693C02F1/66C02F9/00C02F2001/425C02F2101/20C02F2301/08C22B7/006C22B59/00Y02P10/20
Inventor 郭春禹刘芬郭志斌郭雄军贾春花张成军张丽丽
Owner BEIJING TINGRUN MEMBRANE TECH DEV
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