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Method for removing organic matter in uranium-bearing alkaline leaching solution

A technology for leachate and organic matter, which is applied in the field of removing organic matter in uranium-containing alkaline leachate, and can solve problems such as organic matter poisoning

Inactive Publication Date: 2018-03-16
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for removing organic matter in alkaline uranium-containing leachate by weakly basic adsorption resin, which can effectively solve the problem of organic matter poisoning in the process of extracting uranium by ion exchange. Adsorb uranium, improve uranium separation efficiency, and provide technical support for alkaline uranium extraction process

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] An alkaline uranium-containing leachate: pH=10, organic matter concentration 15.5mg / L, uranium concentration 0.866g / L.

[0040] (1) Weakly basic adsorption resin pretreatment leaching solution: put the weak basic adsorption resin into an ion exchange column (plexiglass column), and use the above-mentioned alkaline leaching solution to perform a dynamic adsorption test on the resin, the contact time is 1h, and the penetration concentration Set at 0.1mg / L. The adsorption capacity of the resin at breakthrough is 3.56mg / g dry resin, and the breakthrough volume of the resin is 80BV.

[0041] Use 80g / L NaOH and 100g / L NaCl mixed solution as the eluent to rinse the resin column, wash the column with 5g / L sodium carbonate solution before rinsing, the contact time is 30min, and the concentration of organic matter in the eluting tail liquid is controlled The point is 5mg / L, and the total volume of eluent at the end of elution is 12BV.

[0042] (2) Strongly basic anion exchange ...

Embodiment 2

[0045] An alkaline uranium-containing leachate: pH = 10.5, organic matter concentration 20.7mg / L, uranium concentration 1.41g / L.

[0046] (1) Weakly basic adsorption resin pretreatment leaching solution: put the weakly basic adsorption resin into an ion exchange column (plexiglass column), and use the above-mentioned alkaline leaching solution to perform a dynamic adsorption test on the resin. The contact time is 1.5h, and the penetration The concentration was set at 0.1mg / L. The adsorption capacity of the resin at breakthrough is 4.21 mg / g dry resin, and the breakthrough volume of the resin is 85BV.

[0047] Use 80g / L NaOH and 100g / L NaCl mixed solution as the eluent to rinse the resin column, wash the column with 5g / L sodium carbonate solution before rinsing, the contact time is 40min, and the concentration of organic matter in the eluting tail liquid is controlled The point is 5mg / L, and the total volume of the eluent at the end of the elution is 11BV.

[0048] (2) Strong...

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Abstract

The invention belongs to the technical field of organic matter separation and particularly relates to a method for removing organic matter in a uranium-bearing alkaline leaching solution. The method comprises the following steps that (1) the organic matter is removed through weakly alkaline adsorption resin, specifically, the weakly alkaline acrylic skeleton adsorption resin is added into an ion exchanging column, the uranium-bearing alkaline leaching solution is selected so as to conduct a dynamic adsorption test on the organic matter in the uranium-bearing alkaline leaching solution; (2) drip washing of the weakly alkaline adsorption resin is conducted, specifically, before drip washing, the column is washed through a sodium carbonate solution with the mass concentration being 5g / L; and(3) uranium is recovered through strongly alkaline anion exchanging resin, specifically, the strongly alkaline anion exchanging resin is added into the ion exchanging column, the uranium-bearing alkaline leaching solution treated in the step (1) is selected, and uranium in the uranium-bearing alkaline leaching solution is subjected to dynamic adsorption, wherein the contact time is 5-15 min, and the penetration concentration is determined to be 5 mg / L. Through the method, the problem of organic matter poisoning in the technique of ion exchanging for uranium extraction can be effectively solved, uranium is not adsorbed while the organic matter is adsorbed and removed, the uranium separating efficiency is improved, and technological support is provided for an alkaline method uranium extraction technique.

Description

technical field [0001] The invention belongs to the technical field of organic matter separation, and in particular relates to a method for removing organic matter in uranium-containing alkaline leachate. Background technique [0002] During the leaching process of alkaline uranium ore, organic substances such as humic acid and fulvic acid contained in it will dissolve into the leach solution together with metal uranium, which will have an adverse effect on the extraction process of metal uranium: resulting in the extraction of uranium by solvent extraction. When the organic phase is emulsified, the extraction capacity of the organic relative to uranium is reduced; when the ion exchange method is used to extract uranium, the organic matter in the solution will block the pore size of the ion exchange resin, reduce the exchange capacity of the ion exchange resin for uranium, and cause resin poisoned. [0003] At present, in the field of uranium mining and metallurgy, the meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B3/12C22B60/02
CPCC22B60/0265C22B3/12C22B3/24
Inventor 封宇陈树森郭尔华
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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