Uranium mining method for sandstone uranium ore using surfactant combined with acid in-situ leaching

A technology of surfactant and active agent, which is applied in the field of uranium mining with surfactant combined with acid leaching, can solve the problem that the uranium leaching rate has not been greatly improved, and the recovery rate of high uranium resources and surface activity cannot be met. In order to achieve the effects of high permeation and leaching efficiency, reduced charge density and high leaching rate

Active Publication Date: 2021-06-15
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the weak point of this method is: the perfluoroalkyl sulfonyl fluoride in this surfactant is a long fluorocarbon chain (C≥8) compound, it is difficult to degrade in the environment, and the consumption of surfactant is large
However, the disadvantage of this method is that after using this method, the uranium leaching rate has not been greatly improved, and it cannot meet the requirements for the recovery rate of high uranium resources.
However, the disadvantage of this method is that the non-ionic fluorocarbon surfactant FS-3100 is a long fluorocarbon chain (C≥8) compound, which is difficult to degrade in the environment, will pollute the environment, and is very expensive

Method used

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  • Uranium mining method for sandstone uranium ore using surfactant combined with acid in-situ leaching
  • Uranium mining method for sandstone uranium ore using surfactant combined with acid in-situ leaching
  • Uranium mining method for sandstone uranium ore using surfactant combined with acid in-situ leaching

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] see figure 2 As shown, this embodiment is based on the geological characteristics of low-permeability sandstone-type uranium deposits: including mudstone 3, uranium-containing rock sand 4 reduced rock sand 5 and altered rock sand 6, the uranium grade is 0.025%, and the permeability coefficient of uranium ore is 0.78~ 0.96m / d, determine the technical route of uranium mining by in-situ leaching, and select the uranium mining method of surfactant combined with acid in-situ leaching (such as figure 1 shown):

[0054] S1. Pretreatment: Carry out uranium mine stope division, layout of pumping and injection production drilling, and pipe network installation; In the mine seam, the mine seam pretreatment is dredged through the groundwater circulation;

[0055] S2, uranium oxide ore layer: After the groundwater cycle is over, inject oxygen into the groundwater in the uranium ore layer as an oxidant, and the oxygen injection concentration is 500mg / L; when the residual oxygen co...

Embodiment 2-5

[0076] The difference from Example 1 is that the mass concentration of the surfactant is different, and the others are the same as in Example 1, and will not be repeated here.

[0077] Table 2 is the mass concentration and performance parameter thereof of embodiment 1-5 tensio-active agent

[0078] Example Mass concentration of surfactant (%) Uranium leaching rate (%) Example 1 0.005 92.21 Example 2 0.001 80.11 Example 3 0.003 88.32 Example 4 0.007 93.16 Example 5 0.01 86.04

[0079] It can be seen from Table 2 that the concentration of compound ternary surfactant has a great influence on the leaching rate of uranium, and the leaching rate of uranium increases first and then decreases with the increase of surfactant concentration. At a concentration of 0.007%, it reaches a peak value of 93.16%. Afterwards, the leaching rate began to decrease with the increase of surfactant concentration, and decreased to 86.04% when the con...

Embodiment 6-8

[0082] The difference from Example 1 is that the proportioning ratio of the compounded ternary surfactant is different, and the others are the same as in Example 1, and will not be repeated here.

[0083] Table 3 is the proportioning and performance parameters of embodiment 1 and embodiment 6-8 composite ternary surfactant

[0084]

[0085] It can be seen from Table 3 that the nonionic short carbon chain fluorocarbon surfactant has the best effect on reducing the surface tension of the sulfuric acid immersion solution. This is mainly related to the structure of the fluorocarbon chain on the nonionic short carbon chain fluorocarbon surfactant, which is both oleophobic and hydrophobic, and the interaction between the fluorocarbon chains is weak, so that it exhibits high surface activity in sulfuric acid solution . The composite system used in the present invention can change the physical and chemical properties of a single system, and the composite of fluorocarbon-hydrocarbo...

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Abstract

The invention provides a uranium mining method for sandstone uranium ore using surface active agent combined with acid in-situ leaching. Firstly, the pretreatment of uranium mine stope division, drilling layout, pipe network installation and groundwater circulation dredging of uranium ore layer is carried out; then oxygen injection is carried out to oxidize the ore layer, and sulfuric acid leaching solution is prepared to adjust to a predetermined pH value; then Add a predetermined concentration of compound ternary surfactant system into the leaching solution to prepare a permeation-increasing leaching solution for leaching treatment of hexavalent uranium metal; finally extract the leaching solution for resin adsorption, leaching, precipitation and filtration processing to obtain uranium concentrates. The uranium mining method provided by the invention combines a compound ternary surfactant system and an acid in-situ leaching technology, injects oxygen as an oxidant to mine uranium ore, and has a high leaching rate and a simple process. The compounded ternary surfactant system provided by the invention has high penetration and leaching aid efficiency, less consumption, and is environmentally friendly and degradable.

Description

technical field [0001] The invention relates to the technical field of uranium mining by in-situ leaching, in particular to a uranium mining method for sandstone uranium ore in which a surfactant is combined with acid in-situ leaching. Background technique [0002] Uranium is an important nuclear power raw material and national defense strategic resource. Uranium atoms can undergo fission reactions and release a large amount of energy, which can be used in power generation, nuclear weapon manufacturing and other fields. [0003] Uranium can be mined through open pits, underground mines, by-product separation and in situ leaching. Among them, in-situ leaching uranium mining has a short construction time, saves labor, does not produce tailings, does not require crushing and handling procedures, and is suitable for sandstone uranium deposit mining. The in-situ leaching mining of uranium in the uranium-bearing ore layer is realized through the following methods: the leaching ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B60/02
CPCC22B3/08C22B60/0234
Inventor 戴兵张雷陈英贺桂成
Owner NANHUA UNIV
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