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A method for electric-assisted enhanced leaching of uranium in low-grade uranium ore

An enhanced leaching and low-grade technology, applied in the field of uranium leaching, can solve problems such as hindering uranium leaching, and achieve the effect of increasing leaching rate and simple process flow

Active Publication Date: 2020-07-24
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter which scheme is used in the prior art, there are the following disadvantages: elements such as iron, calcium, aluminum, and barium dissolved during the leaching process are very easy to form sulfate precipitates or hydroxide colloids, and cover the surface of the uranium ore, which seriously hinders the uranium leaching

Method used

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  • A method for electric-assisted enhanced leaching of uranium in low-grade uranium ore
  • A method for electric-assisted enhanced leaching of uranium in low-grade uranium ore
  • A method for electric-assisted enhanced leaching of uranium in low-grade uranium ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take 20g uranium ore (0.008% uranium content) into the electric assisted leaching tank, use 60g / L sulfuric acid as the leaching agent, metal iron as the anode, graphite as the cathode, control the current intensity to 0.4A, and the solid-liquid ratio to 1:30. Air was introduced into the leaching solution, the concentration of oxygen in the leaching solution was 6 mg / l, the leaching time was 2 hours, the stirring speed was 150 r / min, the leaching rate of uranium at different leaching temperatures was shown in figure 2 . Under the same conditions, the uranium leaching rate of the electric assisted leaching example 1 is 23% higher than that of the direct acid leaching comparative example 1.

Embodiment 2

[0041] Take 20g of uranium ore (0.008% uranium content) into the electric assisted leaching tank, use 60g / L sulfuric acid as the leaching agent, metallic iron as the anode, and graphite as the cathode, control the current intensity to 0.4A, and the leaching temperature to 25°C. Into the air, the concentration of oxygen in the leaching solution is 8mg / l, the leaching time is 2h, the stirring speed is 150r / min, the leaching rate of uranium under different solid-liquid ratios is shown in image 3 . Under the same conditions, the uranium leaching rate of the electric assisted leaching example 2 is 21% higher than that of the direct acid leaching comparative example 2.

Embodiment 3

[0043] Take 25g of uranium ore (0.01% uranium content) into the electric assisted leaching tank, the metal iron is the anode, the graphite is the cathode, the control current intensity is 0.4A, the leaching temperature is 25°C, and air is passed into the leaching solution, and the oxygen in the leaching solution The concentration is 8mg / l, the leaching time is 2h, the solid-liquid ratio is 1:30, the stirring speed is 150r / min, the leaching rate of uranium under different sulfuric acid concentrations is shown in Figure 4 . Under the same conditions, the leaching rate of uranium in the electric assisted leaching example 3 is 40% higher than that in the direct acid leaching comparative example 3.

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Abstract

The invention discloses a method for electric-assisted reinforcement leaching of uranium in low-grade uranium ores, and relates to the field of uranium ore smelting. Metal iron is used as anodes, andgraphite or metal iron is used as cathodes; under the effect of direct current, anode iron is gradually dissolved and converted to trivalent iron ions to promote conversion of indissolvable tetravalent uranium to dissolvable hexavalent uranium; and meanwhile, under the effect of an electric field, dissolved ions can be urged to move to the cathode and the anode, so that wrapping to the uranium ores and absorption of uranium by precipitations generated in the leaching process are reduced, and the uranium leaching rate is increased. The method is suitable for the low-grade uranium ores with highgangue content, complicated uranium and gangue embedding relation and high content of tetravalent uranium.

Description

technical field [0001] The invention relates to a method for leaching uranium from uranium-containing ores and tailings, in particular to a method for electrically assisting leaching low-grade uranium ore to recover uranium resources. Background technique [0002] Uranium is an important strategic energy metal. In recent years, its mining volume and demand have increased significantly, and the supply is in short supply. With the gradual depletion of high-grade uranium ore resources, low-grade uranium ore can be recycled as a potential uranium resource. The main phases of low-grade uranium ores include gangue components such as silicon dioxide, iron silicate, aluminum silicate, and calcium silicate. Since the grade (<0.02%) of uranium in low-grade uranium ores is much lower than that of conventional The content of uranium in uranium ore (~0.1%), and uranium is usually dispersed in gangue minerals in the form of ultrafine particles, what's more, part of uranium exists in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B3/08
CPCC22B3/045C22B60/0234
Inventor 李密黄春梅张晓文吴晓燕丁德馨谢超张德
Owner NANHUA UNIV