Novel pool-type process for removing alkali of alkaline uranium ore by using hydrochloric acid

A new process technology for uranium ore, which is applied in the new process field of alkali uranium ore pool hydrochloric acid removal, can solve the problems of low recovery rate, low work efficiency, calcium sulfate precipitation and blockage, etc., and achieves reduced acid consumption and simple operation Convenience and the effect of improving the recovery rate

Inactive Publication Date: 2014-09-24
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Alkaline uranium ore is generally leached by alkaline process, but some basic uranium ores with high phosphorus content, such as uranium smelting by alkaline process, have a low recovery rate. When acid lea

Method used

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  • Novel pool-type process for removing alkali of alkaline uranium ore by using hydrochloric acid
  • Novel pool-type process for removing alkali of alkaline uranium ore by using hydrochloric acid
  • Novel pool-type process for removing alkali of alkaline uranium ore by using hydrochloric acid

Examples

Experimental program
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Example Embodiment

[0082] Example 1

[0083] The J2YJ3 hydrochloric acid dealkalization test adopts 10g / L and 7g / L hydrochloric acid leaching solution and the working conditions of the leaching solution pH control value of 4. The 10g / L hydrochloric acid leaching solution sample has a higher working efficiency, and the acidity is 10g / L The highest calcium content in the extract is 24.47-29.79g / L, and the highest calcium content in the extract with an acidity of 7g / L is 21.81-23.94g / L. It can be seen that the higher the initial acidity of calcium removal, the greater the calcium acidity of the leaching solution. The ore is soaked with 7g / L and 10g / L hydrochloric acid leaching solution, and the leaching rate of calcium carbonate based on the residue is about 65%. The acid consumption rates of the leachate with different acidity of 10g / L and 7g / L in the process of interacting with ore were 18.2 and 17.5%, respectively. The alkali removal cycle is only 28 days. The working conditions and test results...

Example Embodiment

[0088] Example 2

[0089] The working conditions and test results of the J2YJ4-J hydrochloric acid removal test are shown in Table 11. It can be seen from Table 11 that there is no obvious difference in the alkali removal effect of -5 and -10mm size ore. The calcium leaching rate reached 36.6%, the average acid consumption rate was 11.2%, the Ca content was 220mg / L at the end of the debasing, and the test period was 67 days.

[0090] Table 11 J2YJ4-J hydrochloric acid dealkalization test process conditions and decalcification effect

[0091]

[0092]

Example Embodiment

[0093] Example 3

[0094] The working conditions and test results of the J2YJ6-J hydrochloric acid removal test are shown in Table 12. It can be seen from Table 12 that the effect of removing alkali from -5 and -10mm size ore is not obvious.

[0095] Table 12 J2YJ6-Ju hydrochloric acid debasing test process conditions and decalcification effect

[0096]

[0097] The comprehensive results of the above 3 tests are shown in Table 13. It can be seen from Table 13 that the leaching rate of calcium based on liquid is 37-60%, with an average of 43.63%; the leaching rate of calcium based on residue is 81.8-90.2%, with an average of 86%; the average acid consumption rate is 13.39%; and the Ca content at the end of the removal is 50— 550mg / L, an average of 242.2mg / L; the test period is 28-78d, an average of 61 days.

[0098] Table 13 Comprehensive results of hydrochloric acid removal test

[0099]

[0100]

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Abstract

The invention discloses a method for removing alkali of an alkaline uranium ore. The method is characterized by comprising the following step: removing alkali by adopting hydrochloric acid, wherein the step of removing alkali by adopting hydrochloric acid mainly performs calcium carbonate removal substantially; a measurement index of the process of removing calcium carbonate by hydrochloric acid is a boundary value of the calcium content of a leaching liquid without calcium sulfate precipitation; the process conditions of removing alkali by using hydrochloric acid are that in an initial stage, operating conditions that a pH value control value of a 10g/L hydrochloric acid leaching solution and leaching liquid exchange liquid is 4 are adopted. The calcium removal process condition is relatively high in working efficiency, and is relatively acid-saving; the average liquid calcium removal rate is 36.6%; the calcium carbonate removal rate can reach 65-90%; the calcium content in the leaching liquid is smaller than 50-550mg/L; the average acid consumption rate is 13.39%; the average calcium removal cycle is 51 days; and moreover, the threats of calcium sulfate precipitation can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a new process for alkaline uranium ore pool hydrochloric acid removal. It is suitable for the acid uranium smelting project of hard rock basic uranium ore with calcium carbonate content greater than 2%, and is more beneficial to uranium ore with lower hexavalent uranium content. Background technique [0002] Alkaline uranium ore is generally leached by alkaline process, but some basic uranium ores with high phosphorus content, such as uranium smelting by alkaline process, have a low recovery rate. When the acid leaching must be adopted, the basic uranium ore is prone to calcium sulfate precipitation and blockage when leaching uranium with sulfuric acid, which affects the progress of the acid uranium smelting work and the work efficiency is low. Contents of the invention [0003] The purpose of the present invention is to develop a process for alkali-removin...

Claims

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Application Information

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IPC IPC(8): C22B60/02C22B3/10
Inventor 孙占学史维俊周义朋李学礼刘金辉
Owner EAST CHINA UNIV OF TECH
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