Use method of organochlorine oxidant in acid-process in-situ leaching uranium mining

An in-situ leaching technology for mining uranium and oxidants, applied in the direction of improving process efficiency, etc., can solve the problems of easy decomposition, difficult long-term storage, instability, etc., and achieve the effect of obvious oxidation effect and shortened leaching cycle

Active Publication Date: 2021-05-28
BEIJING RES INST OF CHEM ENG & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During long-term use, the following problems were found: 1.H 2 o 2 Unstable, easy to decompose, difficult to store for a long time; 2.H 2 o 2 Low effective oxygen content; 3. When the concentration is too high, it will react with uranyl ions to form uranyl peroxide; 4. When used in low-permeability deposits, gas blockage may occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A certain uranium deposit occurs in the Shuixigou Group of the Middle and Lower Jurassic. The profile of the ore body is dominated by rolls and complex rolls. The thickness of the ore bed is 0.8m-4.5m, with an average of 2.0m; the ore grade is 0.017%-0.055%, with an average of 0.0357%; the average uranium content per square meter is 2.52kg / m 2 . The ratio of tetravalent uranium to hexavalent uranium in the ore is 55%:45%. It has been verified by laboratory tests that it is suitable for acid leaching. The well type is mainly five-point type, and the well spacing is 25-30m.

[0026] Step 1: Add H to groundwater 2 SO 4 Preparation of leaching agent, H 2 SO 4 When the concentration is 8.0g / L, acidification is started, and the acidification process is completed when the pH value of the leachate drops to 1.8;

[0027] Step 2: After completing the acidification, start to add the mixed solution of dichloroisocyanuric acid and trichloroisocyanuric acid as an oxidizing agen...

Embodiment 2

[0033] A uranium deposit mainly occurs in the lower sub-member of the lower member of the Zhiluo Formation of the Middle Jurassic. The ore body is mainly plate-shaped. The average thickness of the ore body is 5.84m, the average grade is 0.0317%, and the average uranium content per square meter is 3.89kg / m 2 . The ratio of tetravalent uranium to hexavalent uranium in ore is 60%:40%. It is verified by laboratory tests that it is suitable for acid leaching. The well type is mainly seven-point type, and the well spacing is 30m.

[0034] Step 1: Add H to groundwater 2 SO 4 Preparation of leaching agent, H 2 SO 4 When the concentration is 12.0g / L, acidification starts, and when the pH value of the leachate drops to 1.76, the acidification process is completed;

[0035] The second step: After the acidification is completed, start to add the mixed solution of dichloroisocyanuric acid and trichloroisocyanuric acid as the oxidizing agent. The prepared oxidant is added into the do...

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Abstract

The invention belongs to the technical field of in-situ leaching uranium mining, and particularly relates to a use method of an organochlorine oxidant in acid-process in-situ leaching uranium mining. H2SO4 is added into underground water to prepare a leaching agent, and acidification is started; a mixed solution of dichloroisocyanuric acid and trichloroisocyanuric acid is added as an oxidizing agent, the mass concentration ranges from 150 mg / L to 300 mg / L, the mass ratio of dichloroisocyanuric acid ranges from 20% to 30%, and the mass ratio of trichloroisocyanuric acid ranges from 70% to 80%; the Eh value of lixivium is monitored, when the Eh value of the lixivium is stabilized to be 550 mV or above, the mass concentration of the oxidizing agent is not changed, the mass ratio of dichloroisocyanuric acid is 60%-70%, and the mass ratio of trichloroisocyanuric acid is 30%-40%; the free chlorine concentration of the lixivium is monitored, and when the free chlorine concentration is larger than 8 mg / L, the concentration is reduced to 40%-60% of the original concentration; and when the leaching rate of blocks is greater than 80%, oxidizing agent adding is stopped, and the concentration of H2SO4 is reduced to 3.0-5.0 g / L until the leaching process is finished. According to the use method, tetravalent uranium in the ore can be effectively oxidized, the uranium concentration of the lixivium is improved, the reagent cost of the oxidizing agent is reduced, and the leaching period of the ore is shortened.

Description

technical field [0001] The invention belongs to the technical field of uranium mining by in-situ leaching, and in particular relates to a method for using an organic chlorine oxidant in uranium mining by acid in-situ leaching. Background technique [0002] Acid in-situ leaching has the advantages of high concentration of uranium in the leach solution and short recovery period, and has been widely used in the world. Since the uranium minerals in the sandstone-type uranium deposits exist in the tetravalent form, an oxidant must be added to oxidize the tetravalent uranium to the hexavalent form. H 2 o 2 as an oxidizing agent. [0003] During long-term use, the following problems were found: 1.H 2 o 2 Unstable, easy to decompose, difficult to store for a long time; 2.H 2 o 2 The effective oxygen content is low; 3. When the concentration is too high, it will react with uranyl ions to form uranyl peroxide; 4. When used in low-permeability ore deposits, gas blockage may occur...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/08
CPCC22B60/0234Y02P10/20
Inventor 邓锦勋原渊成弘许影周根茂李建华谭亚辉赵利信张翀程威
Owner BEIJING RES INST OF CHEM ENG & METALLURGY
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