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Flow uranium leaching process

A process and leaching technology, applied in the field of uranium smelting, can solve problems such as increasing production costs, precipitation clogging, and affecting the recovery of uranium resources, and achieve the effects of increased production efficiency, reduced material costs, and significant leaching effects

Inactive Publication Date: 2016-04-20
EAST CHINA UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, the methods commonly used to increase the efficiency of uranium leaching by strengthening the acidity, strengthening the oxidant and prolonging the immersion time will not only inevitably further increase the production cost, but also easily cause precipitation blockage, which will affect the recovery of uranium resources.

Method used

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Embodiment

[0058] Alkaline cloud uranium ore is a very acid-consuming and difficult to leach ore. The uranium grade is low, 0.1-0.12%, but the calcium carbonate content is high, more than 4-5%. In September 2015, two flow uranium leaching process tests were carried out using alkaline cloud-bound uranium ore, Example 1 and Example 2, and the two examples were YJLS7LD4 and YJLS8LD5 respectively.

[0059] 1. Determination of three hydrogeochemical parameters

[0060] 1. Reaction condition boundary value

[0061] When the reaction free energy of hydrogeochemical action is set to zero, and other reaction conditions related to the action are set as constant values, the ideal value of another studied reaction condition calculated according to the principle of thermodynamics is called Reaction condition boundary value.

[0062] In sulfuric acid medium, the reaction conditions related to calcium sulfate precipitation include sulfate radical and calcium ion, but the decisive factor is calcium io...

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Abstract

The invention discloses a flow uranium leaching process which adopts flow of a leaching solution to complete uranium leaching, wherein the leaching solution comprises a sulfuric acid solution, a bacterial liquid and a uranium leaching reagent. According to the hydrogeochemical principle, the following three novel hydrogeochemical parameters are established: (1) a reaction condition boundary value related to chemical thermodynamics, (2) peak value reaching time related to reaction kinetics, and (3) residence time or flow speed related to a hydrodynamic condition; residence, in ores, of the leaching solution meets the following principles: (1) leaching is within time quantum of highest uranium leaching efficiency; (2) the residence time must meet the principle that the solution flows out of the system as soon as possible once the peak value is reached; (3) the principle that acidity of the leaching solution meets uranium leaching requirements, and other components irrelevant to uranium leaching are leached as many as possible; and (4) the principle that harmful components do not exceed the boundary value. According to the flow uranium leaching process, a conventional batch type tank and pile type uranium leaching process is changed into a continuous uninterrupted flow uranium leaching process, so that good effect is achieved.

Description

technical field [0001] The invention belongs to the field of uranium smelting, and relates to a high-efficiency uranium leaching process for avoiding precipitation compaction, in particular to a uranium leaching method suitable for hard rock uranium ore. Background technique [0002] With the development of nuclear power energy, the requirements for nuclear fuel will exceed the current development level of uranium resources. Due to the high cost of uranium smelting in the traditional water smelting process, it is only suitable for high-grade uranium ores. Therefore, most uranium mines in southern my country that mainly use hard rock have turned to heap leaching and pool leaching for uranium mining. host. However, the heap leaching and pool leaching uranium mining cycle is long, and it is difficult to meet the growing demand for uranium metal in nuclear power. What's more serious is that many uranium mines that rely mainly on heap leaching and pool leaching uranium mining st...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B60/02
CPCC22B3/18C22B60/0226
Inventor 史维浚孙占学朱建伟卫忠元宋金茹
Owner EAST CHINA UNIV OF TECH
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