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A wastewater treatment process for radioactive exemption of neutralization slag in rare earth extraction wastewater

A waste water treatment and radioactive technology, applied in the field of environmental protection and industrial production, can solve the problems that cannot be treated as general solid waste and produce a large amount of radioactive neutralization slag, so as to achieve small output, reduce treatment costs, and reduce production. Effect

Active Publication Date: 2018-06-19
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 Glote Environmental Engineering Co., Ltd. The rare earth extraction wastewater used in the experiment was taken from a rare earth enterprise. In the experiment, add sodium hydroxide to the wastewater to adjust the pH to 1, add 4mg / L PAM flocculant to flocculate the precipitated solid, filter and measure the amount of slag, detect the content of thorium and uranium in the wastewater before and after treatment, and finally pour it into the wastewater Add milk of lime to adjust the pH to 7 to form a neutralized slag whose radioactive level reaches the exempt value.

Embodiment 2

[0019] The experiment was carried out in the laboratory of Nanjing Glote Environmental Engineering Co., Ltd. The rare earth extraction wastewater used in the experiment was taken from a rare earth enterprise. In the experiment, add sodium hydroxide to the wastewater to adjust the pH to 3, add 8mg / L PAM flocculant to flocculate the precipitated solids, filter and measure the amount of slag, detect the content of thorium and uranium in the wastewater before and after treatment, and finally pour it into the wastewater Add milk of lime to adjust the pH to 10 to form a neutralized slag whose radioactive level reaches the exempt value.

Embodiment 3

[0021] The experiment was carried out in the laboratory of Nanjing Glote Environmental Engineering Co., Ltd. The rare earth extraction wastewater used in the experiment was taken from a rare earth enterprise. In the experiment, add sodium hydroxide to the wastewater to adjust the pH to 2, add 6mg / L PAM flocculant to flocculate the precipitated solids, filter and measure the amount of slag, detect the content of thorium and uranium in the wastewater before and after treatment, and finally add it to the wastewater Add milk of lime to adjust the pH to 8 to form a neutralized slag whose radioactive 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 associated with natural radionuclides such as uranium (U) and thorium (Th). During the production process of rare earths, these radionuclides are often enriched in intermediate products and "three wastes", so that most of the rare earth production processes There is radioactive contamination. Radioactive pollution has the characteristics of strong hidden danger, great lethality, great harm, and the pollution source is difficult to destroy and deal with, which brings radioactive 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 co...

Claims

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Application Information

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Patent Type & Authority Patents(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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