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Wastewater treatment process for radioactivity exemption of rare earth extraction wastewater neutral dregs

A technology for wastewater treatment and radioactivity, applied in the fields of environmental protection and industrial production, can solve the problems that cannot be treated as general solid waste, and the generation of radioactive neutralized slag is large, so as to achieve small output, lower treatment costs, and good removal effect. Effect

Active Publication Date: 2016-12-07
NANJING GW ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The content of the present invention aims at the problems that the existing rare earth extraction wastewater has a high content of radioactive elements, and the amount of radioactive neutralized slag produced by the wastewater treatment process is large, and it cannot be treated as general solid waste. Rare earth extraction wastewater treatment process meeting radioactive exemption standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The experiment was carried out in the laboratory of Nanjing Global Environmental Engineering Co., Ltd. The rare earth extraction wastewater used in the experiment was taken from a rare earth company. In the experiment, sodium hydroxide was added to the wastewater to adjust the pH to 1, the 4mg / L PAM flocculant was added to flocculate the precipitated solids, filtered and the amount of slag was measured, and the content of thorium and uranium in the wastewater before and after treatment was detected, and finally added to the wastewater Add lime milk to adjust the pH to 7 to form a neutralized residue whose radioactivity level reaches the exempt value.

Embodiment 2

[0019] The experiment was carried out in the laboratory of Nanjing Global Environmental Engineering Co., Ltd. The rare earth extraction wastewater used in the experiment was taken from a rare earth company. In the experiment, sodium hydroxide was added to the wastewater to adjust the pH to 3, 8mg / L PAM flocculant was added to flocculate the precipitated solids, filtered and the amount of residue was measured, and the content of thorium and uranium in the wastewater before and after treatment was detected, and finally added to the wastewater Add lime milk to adjust the pH to 10 to form a neutralized residue whose radioactivity level reaches the exempt value.

Embodiment 3

[0021] The experiment was carried out in the laboratory of Nanjing Global Environmental Engineering Co., Ltd. The rare earth extraction wastewater used in the experiment was taken from a rare earth company. In the experiment, sodium hydroxide was added to the wastewater to adjust the pH to 2, 6mg / L PAM flocculant was added to flocculate the precipitated solids, filtered and the amount of slag was measured, and the content of thorium and uranium in the wastewater before and after treatment was detected, and finally added to the wastewater Add lime milk to adjust the pH to 8 to form a neutralized slag whose radioactivity level reaches the exempt value.

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Abstract

The invention provides a wastewater treatment process for radioactivity exemption of rare earth extraction wastewater neutral dregs. The process mainly includes the following steps of firstly, putting alkali in rare earth extraction wastewater to adjust the pH of wastewater to be 1-3 so that radioactive elements can be solidified and separated out; secondly, putting flocculant in water produced in the first step to be stirred for precipitating so that formed solid can be separated from wastewater; thirdly, adding lime milk to water produced in the second step to neutralize acidic wastewater to adjust the pH to be 7-10 so that neutral dregs can be formed and the radioactivity exemption of the produced neutral dregs can be achieved. The radioactive elements in rare earth extraction wastewater are removed when the pH is acidic. The radioactive elements left in wastewater obtained after the radioactive elements are enriched are extremely low, and therefore the content of radioactive elements in neutral dregs is small, the radioactivity level reaches an exemption value, the neutral dregs can be disposed as general solid waste, and the treatment expenditures for radioactivity neutral dregs are greatly reduced.

Description

Technical field [0001] The invention relates to the field of industrial production, in particular to the treatment of extraction wastewater generated in rare earth smelting production, and belongs to the field of environmental protection treatment. Background technique [0002] Rare earth minerals are usually accompanied by natural radionuclides such as uranium (U) and thorium (Th). During the production of rare earths, these radionuclides are often enriched in intermediate products and the "three wastes", resulting in most of the production processes of rare earths. There are radioactive contamination. Radioactive pollution has the characteristics of strong concealment, high lethality, high harm and the pollution source is difficult to destroy and deal with, which brings radiological hazards to the workplace and the surrounding environment. [0003] In the rare earth smelting process, the acidic extraction wastewater formed by acid dissolution and extraction of rare earth concent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/20G21F9/06G21F9/10
CPCG21F9/06G21F9/10G21F9/20
Inventor 韩正昌申屠灵女谢文玉马军军韩峰朱家明高亚娟张寅丞朱伯淞何建龙季军吴传宝张寿兵
Owner NANJING GW ENVIRONMENT ENG
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