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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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  • Abstract
  • Description
  • Claims
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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 leaching must be used, the basic uranium ore is prone to calcium sulfate precipitation and blockage when leaching uranium with sulfuric acid, which affects the progress of acid uranium smelting and low work efficiency

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

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Experimental program
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Effect test

Embodiment 1

[0083] J2YJ3 hydrochloric acid alkali removal test adopts the working conditions of 10g / L and 7g / L hydrochloric acid leaching solution and the pH control value of the leaching solution is 4. The highest calcium content in the leachate is 24.47-29.79g / L, and the highest calcium content in the leachate 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 in the leachate. Immerse the ore with 7g / L and 10g / L hydrochloric acid leaching solutions, and the leaching rate of calcium carbonate based on slag is about 65%. The acid consumption rates of 10g / L and 7g / L leaching solutions with different acidity and ore were 18.2 and 17.5%, respectively. The de-alkali cycle is only 28 days. See Table 10 for the working conditions and test results of the J2YJ3 hydrochloric acid alkali removal test.

[0084] Table 10J2YJ3 hydrochloric acid alkali removal test process conditions and calcium removal ef...

Embodiment 2

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

[0090] Table 11J2YJ4-J hydrochloric acid alkali removal test process conditions and calcium removal effect

[0091]

[0092]

Embodiment 3

[0094] See Table 12 for the working conditions and test results of the J2YJ6-J hydrochloric acid alkali removal test. It can be seen from Table 12 that there is no obvious difference in the alkali removal effect of -5 and -10mm particle size ores.

[0095] Table 12J2YJ6-Ju hydrochloric acid alkali removal test process conditions and calcium removal effect

[0096]

[0097] The comprehensive results of the above three experiments are shown in Table 13. It can be seen from Table 13 that the liquid meter calcium leaching rate reaches 37-60%, an average of 43.63%; the slag meter calcium leaching rate is 81.8-90.2%, an average of 86%; the average acid consumption rate is 13.39%; the Ca content at the end of alkali removal is 50- 550mg / L, with an average of 242.2mg / L; the test period was 28-78 days, with an average of 61 days.

[0098] Table 13 Comprehensive results of hydrochloric acid alkali 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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