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Desalination little-reagent ground-dipping uranium extraction method

A technology for in-situ leaching of uranium and oxidizing reagents is applied in the field of uranium ore extraction, which can solve the problems of low uranium concentration in leaching solution, prolong leaching period, affect economic benefits, etc., and achieve the effects of improving uranium leaching efficiency and reducing salinity.

Inactive Publication Date: 2013-06-12
EAST CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

There are still two deficiencies in this research result: one is that the concentration of uranium in the leaching solution is low, which will prolong the leaching cycle, the production cost is high, and affect economic benefits; Calcium, bicarbonate and sulfate in the leaching solution are also high, and CO 2 CaCO 3 Dissolution, increasing Ca 2+ concentration, so there is still a risk of calcium salt precipitation

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  • Desalination little-reagent ground-dipping uranium extraction method
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  • Desalination little-reagent ground-dipping uranium extraction method

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Embodiment Construction

[0055] 1. Desalination and low-reagent in-situ leaching uranium mining process

[0056] Test procedure of the present invention comprises the following steps:

[0057] The desalination and low-reagent in-situ leaching uranium mining process, through the use of desalination, calcium removal, appropriate amount of leaching uranium co-solvent (ammonium bicarbonate), adding HCl and CO 2 Five key technologies, such as acidification to control the pH of the leaching solution and adding oxygen, have better solved the problem of chemical clogging when traditional leaching uranium is used in areas with high salinity. The leaching rate of uranium creates conditions.

[0058] a. Using desalination technology (desalination process), avoiding calcium sulfate precipitation and clogging (see figure 1 ), and at the same time create conditions for the implementation of less reagent technology. In areas where fresh water exists, the desalination process is an economical and effective technolo...

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Abstract

The invention relates to a method for extracting uranium by desalting and on-site leaching with less agent, in particular to a technique for extracting uranium from uranium ores with high degree of mineralization of underground water in an ore bed. The technique adopts a desalting plus less agent step, and the concrete steps of the technique include: 1. desalting underground water and reducing the degree of mineralization of the underground water; and 2 extracting uranium by a leaching agent containing a latent solvent HCO3<->, oxygen and a pH adjustment agent. The invention solves problems of blockage caused by calcium sulphate and calcium carbonate in area with underground water of high degree of mineralization during on-site leaching, ensures smooth uranium extraction by on-site leaching and improves the uranium leaching efficiency.

Description

technical field [0001] The invention relates to a method for extracting uranium by in-situ leaching, in particular to a method for extracting uranium ore from uranium ore with high salinity (>5g / L) of underground water in ore beds. Background technique [0002] Sandstone-type uranium deposits are mainly mined by in-situ leaching, which is generally referred to as in-situ leaching uranium. Conventional in-situ leaching uranium mining processes are mainly divided into two methods: acid method (sulfuric acid) and alkali method (ammonium bicarbonate). However, when the salinity of the groundwater in the ore-bearing layer is high, the in-situ leaching uranium mining technology is limited (foreign countries define sandstone uranium deposits with a mineralization degree of groundwater in the ore-bearing layer exceeding 5g / L as non-in-situ leaching deposits) [1-2] . The mining of sandstone-type uranium deposits under the condition of high-salinity groundwater is a worldwide pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00
Inventor 李学礼史维浚孙占学刘金辉高柏等
Owner EAST CHINA UNIV OF TECH