CN115679135A - Ultrasonic enhanced leaching method for uranium ores - Google Patents
Ultrasonic enhanced leaching method for uranium ores Download PDFInfo
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- CN115679135A CN115679135A CN202110844394.9A CN202110844394A CN115679135A CN 115679135 A CN115679135 A CN 115679135A CN 202110844394 A CN202110844394 A CN 202110844394A CN 115679135 A CN115679135 A CN 115679135A
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Abstract
The invention belongs to the technical field of uranium hydrometallurgy, and particularly relates to an ultrasonic enhanced leaching method of uranium ores. Taking a uranium-containing sandstone ore sample, crushing, putting into a beaker, adding a leaching agent and an oxidant, wherein the liquid-solid ratio is 3:1 to 5:1; step two, adding a reinforcing agent sodium lignin sulfonate after reaction under stirring; putting the beaker into an ultrasonic generator, starting ultrasonic waves and performing intermittent action; and filtering until the uranium concentration in the leaching solution is not changed any more, and analyzing the grade of uranium in the leaching slag. The invention can accelerate the reaction rate and improve the leaching rate of the ore.
Description
Technical Field
The invention belongs to the technical field of uranium hydrometallurgy, and particularly relates to an ultrasonic enhanced leaching method of uranium ores.
Background
Ultrasonic wave is a sound wave with frequency more than 16kHz, can be transmitted in any substance with plasticity, and when liquid-solid surface is radiated by ultrasonic wave, can produce erosion action on the solid surface, cause surface wound and increase mass transfer contact surface area. The uniform mixing of the media is easier to realize, and the reaction speed is improved, thereby strengthening the leaching of minerals. Havsiki et al studied the iron salt leaching of copper ores under ultrasonic action, using 5% Fe 2 (SO4) 3 And 2%H 2 SO 4 Leaching, and compared under different conditions, the leaching rate is increased by 24.3-32.0%.
At present, the amount of sandstone-type uranium ore resources in China accounts for more than 50% of the total amount of proven uranium ore resources in China, and the sandstone-type uranium ore resources become main resources for natural uranium development in China. The ore of a certain sandstone type deposit is mainly fine sandstone and siltstone, the proportion of the fine sandstone and the siltstone is more than 70 percent, and the permeability is poor. Uranium in the ore is mainly adsorbed, and a small amount of uraninite and uranite are found. The results of ore agitation leaching tests show that the ore leaching rate is about 70% and the leaching effect is poor when the reaction is carried out for 72 hours under the conditions that sulfuric acid is used as a leaching agent and hydrogen peroxide is used as an oxidizing agent.
In recent years, ultrasonic waves have been increasingly applied to metallurgical industries, such as enhanced leaching of gold, silver and copper ores, so that the leaching time can be shortened and the leaching rate can be improved. Therefore, the method adopts stirring leaching to recover uranium under the action of an ultrasonic field, and achieves the purposes of shortening a leaching test and improving the leaching rate of ores.
Disclosure of Invention
The invention aims to provide an ultrasonic enhanced leaching method of uranium ores, which can accelerate the reaction rate and improve the leaching rate of the ores.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an ultrasonic enhanced leaching method of uranium ore,
taking a uranium-containing sandstone ore sample, crushing, putting into a beaker, adding a leaching agent and an oxidant, wherein the liquid-solid ratio is 3:1 to 5:1;
step two, after reaction under stirring, adding a reinforcing agent sodium lignosulphonate;
putting the beaker into an ultrasonic generator, starting ultrasonic waves and performing intermittent action; and filtering until the uranium concentration in the leaching solution is not changed any more, and analyzing the grade of uranium in the leaching slag.
The method comprises the following steps of firstly, taking a uranium-containing sandstone ore sample, and crushing the uranium-containing sandstone ore sample to a natural size fraction.
In the first step, the leaching agent is H 2 SO 4 。
Said H 2 SO 4 The concentration is 5.0-20.0 g/L.
In the first step, the oxidant is FeCl 3 Or Fe 2 (SO 4 ) 3 。
The FeCl 3 Or Fe 2 (SO 4 ) 3 The concentration is 0.4-1.0 g/L.
And step two, reacting for 4 hours under stirring.
And in the second step, the concentration of the sodium lignin sulfonate as the reinforcing agent is 0.05-0.15 g/L.
And step three, the ultrasonic power is 60-300W.
And step three, intermittent action, wherein the ratio of the working time to the stopping time is 1:1.
the beneficial effects obtained by the invention are as follows:
the invention particularly relates to a method for recovering uranium from sandstone uranium ore by stirring and leaching under the action of an ultrasonic field. The heating and cavitation effect of ultrasonic wave are utilized, the sodium lignin sulfonate serving as an intensifier is matched, the molecular diffusion and the convection diffusion are increased, the uranium leaching rate in the ore is improved, and the ore leaching rate is improved by more than 15% under the action of an ultrasonic field.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The ultrasonic enhanced leaching method of the uranium ore comprises the following steps:
taking a certain amount of uranium-containing sandstone ore sample, crushing the ore sample to natural size fraction, putting the ore sample into a beaker, adding a leaching agent and an oxidizing agent, wherein the liquid-solid ratio is 3:1 to 5:1; the leaching agent is H 2 SO 4 The concentration is 5.0 to 20.0g/L, the oxidant is FeCl 3 Or Fe 2 (SO 4 ) 3 The concentration is 0.4 to 1.0g/L;
step two, after reacting for 4 hours under stirring, adding a reinforcing agent sodium lignin sulfonate with the concentration of 0.05-0.15 g/L;
step three, putting the beaker into an ultrasonic generator, starting ultrasonic waves, wherein the power of the ultrasonic waves is 60-300W, the ultrasonic waves act intermittently, and the ratio of the working time to the stopping time is 1:1; and filtering until the uranium concentration in the leaching solution is not changed any more, and analyzing the grade of uranium in the leaching slag.
Example 1
The technical scheme for realizing the aim of the invention comprises the following steps:
step one, taking 100g of uranium-containing ore sample, crushing the ore sample to natural size fraction with the ore grade of 0.024%, putting the ore sample into a beaker, and adding a leaching agent H 2 SO 4 500mL, lixiviant H 2 SO 4 10.0g/L, oxidant FeCl 3 The concentration is 0.5g/L, the liquid-solid ratio is 5:1;
step two, after reacting for 4 hours under stirring, adding a reinforcing agent sodium lignin sulfonate with the concentration of 0.12g/L;
putting the beaker into an ultrasonic generator, starting ultrasonic waves with the power of 200W, stopping the ultrasonic waves for 10min every working time, and intermittently working; after the reaction is finished, the grade of the leached slag sample is filtered and analyzed, the grade of the leached slag is 0.0025 percent, and the leaching rate of the ore is 89.7 percent.
Example 2
The technical scheme for realizing the aim of the invention comprises the following steps:
step one, taking 200g of uranium-containing ore sample, crushing the uranium-containing ore sample until the ore grade is 0.024 percent to natural size fraction, putting the uranium-containing ore sample into a beaker, and adding a leaching agent H 2 SO 4 800mL, lixiviant H 2 SO 4 8.0g/L, oxidant Fe 2 (SO 4 ) 3 The concentration is 0.3g/L, the liquid-solid ratio is 4:1;
step two, after reacting for 4 hours under stirring, adding a reinforcing agent sodium lignin sulfonate with the concentration of 0.15g/L;
putting the beaker into an ultrasonic generator, starting ultrasonic waves with the power of 120W, stopping the ultrasonic waves for 30min every working time, and intermittently working; after the reaction is finished, the grade of the leached slag sample is filtered and analyzed, the grade of the leached slag is 0.0043 percent, and the leaching rate of the slag meter is 82.4 percent.
Comparative example 1
Step one, taking 100g of uranium-containing ore sample, crushing the ore sample to natural size fraction with the ore grade of 0.024%, putting the ore sample into a beaker, and adding a leaching agent H 2 SO 4 500mL, lixiviant H 2 SO 4 6.0g/L, oxidant FeCl 3 The concentration is 0.4g/L, the liquid-solid ratio is 5:1;
step two, after reacting for 4 hours under stirring, adding a reinforcing agent sodium lignosulfonate with the concentration of 0.12g/L;
and step three, after the reaction is finished, filtering and analyzing the grade of the leached slag sample, wherein the grade of the leached slag is 0.0066%, and the leaching rate of the ore is 73.6%.
Compared with the example 1, under the condition that other conditions are consistent, the ore leaching rate is improved by about 16.1% under the action of the ultrasonic field, and the improvement amplitude is large.
Claims (10)
1. An ultrasonic enhanced leaching method of uranium ore is characterized in that:
taking a uranium-containing sandstone ore sample, crushing, putting into a beaker, adding a leaching agent and an oxidant, wherein the liquid-solid ratio is 3:1 to 5:1;
step two, adding a reinforcing agent sodium lignin sulfonate after reaction under stirring;
putting the beaker into an ultrasonic generator, starting ultrasonic waves and performing intermittent action; and filtering and analyzing the grade of uranium in the leaching slag until the concentration of uranium in the leaching solution is not changed any more.
2. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein: the method comprises the following steps of firstly, taking a uranium-containing sandstone ore sample, and crushing the ore sample to natural size fraction.
3. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein: in the first step, the leaching agent is H 2 SO 4 。
4. The ultrasonic enhanced leaching method of uranium ore according to claim 3, wherein: said H 2 SO 4 The concentration is 5.0-20.0 g/L.
5. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein: in the first step, the oxidant is FeCl 3 Or Fe 2 (SO 4 ) 3 。
6.The ultrasonic enhanced leaching process of uranium ore according to claim 5, wherein: the FeCl 3 Or Fe 2 (SO 4 ) 3 The concentration is 0.4-1.0 g/L.
7. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein: and step two, reacting for 4 hours under stirring.
8. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein: and in the second step, the concentration of the sodium lignin sulfonate as the reinforcing agent is 0.05-0.15 g/L.
9. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein: and step three, the ultrasonic power is 60-300W.
10. The ultrasonic enhanced leaching method of uranium ore according to claim 1, wherein:
and step three, intermittent action, wherein the ratio of the working time to the stopping time is 1:1.
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