Method for confirming uranium dissolving capacity of organic fluid

Abstract

The invention relates to the field of uranium mining, in particular to a method for confirming the uranium dissolving capacity of organic fluid. The method comprises the following steps: collecting red sandstone, gray sandstone and green ore-containing sandstone, and pretreating the three samples; the invention relates to an organic fluid-containing uranium dissolution experiment under different temperature conditions. The experiment specifically comprises the following steps: respectively preparing reaction media; the pretreated red sandstone, gray sandstone and green ore-containing sandstone are taken to react with seven reaction media respectively, the reaction temperature is set to be the six temperature conditions of normal temperature, 50 DEG C, 80 DEG C, 110 DEG C, 130 DEG C and 150 DEG C, and the reaction time is 2 days; after the reaction is finished, a reaction product is centrifuged, supernate is taken, and uranium concentration analysis is carried out; analyzing and sorting the uranium concentration analysis data, discussing the uranium dissolving and migrating capability of the organic fluid in combination with the experimental temperature, and determining the influence of the temperature on the uranium dissolution of the organic fluid. The method is high in operability, and provides a first-hand experimental data support for uranium penetration mineralization.

Description

Technical Field

[0001] The invention relates to the field of uranium mining, and in particular to a method for confirming the uranium dissolution capacity of an organic fluid. Background Art

[0002] As the red variegated sandstones in the Cretaceous System of the Ordos Basin and the Erlian Basin have been found to contain mineralization clues, it is different from the traditional sandstone uranium deposits. The mineralized layers are multi-layered and plate-like, which is difficult to explain with the traditional infiltration (phreatic oxidation, interlayer oxidation) sandstone-type uranium mineralization theory. The uranium mineralization in the red variegated sandstone may be the result of seepage uranium mineralization. Whether the deep organic seepage fluid can dissolve and migrate uranium and the effect of temperature on uranium dissolution are still undecided. It is necessary to use the technical means of mineralization simulation experiments for basic research.

[0003] Therefore, a method for confirming the uranium solubility of organic fluids is urgently needed to determine the ability of organic fluids to dissolve mobile uranium and determine the factors affecting the dissolution of uranium in organic fluids. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for confirming the uranium dissolving capacity of organic fluid.

[0005] The present invention provides a method for confirming the uranium dissolution capacity of an organic fluid, comprising the following steps:

[0006] Step S1: collect red sandstone, gray sandstone, and green mineral-bearing sandstone, and pre-treat the three samples;

[0007] Step S2: Uranium dissolution experiment in organic fluid under different temperature conditions, specifically including:

[0008] Step S2-1: preparing reaction media respectively, wherein the reaction media are acetic acid, formic acid, imidazole, imidazolecarboxylic acid, pyridine, pyridinemethanol, and humic acid with a mass concentration of 2%;

[0009] Step S2-2: taking the pretreated red sandstone, gray sandstone, and green mineral-bearing sandstone to react with seven reaction media respectively, and setting the reaction temperature to six temperature conditions of room temperature, 50° C., 80° C., 110° C., 130° C., and 150° C., and the reaction time is 2 days;

[0010] Step S2-3: After the reaction is completed, the reaction product is centrifuged, and the supernatant is taken for uranium concentration analysis using an Element XR plasma mass spectrometer according to the analysis method of DZ / T0064.80-1993;

[0011] Step S2-4: Analyze and organize the uranium concentration analysis data, combine the experimental temperature, explore the ability of organic fluid to dissolve and migrate uranium, and determine the effect of temperature on the dissolution of uranium in organic fluid.

[0012] Preferably, the step 1 further comprises: analyzing the uranium concentration by an Element XR plasma mass spectrometer.

[0013] Preferably, the pretreatment method is: crushing the sample to 40-60 mesh, ultrasonic cleaning for 10 minutes to remove dust and burrs on the sample surface; and drying the cleaned sample in a 50° C. forced air drying oven for 6 hours.

[0014] Preferably, in step S2-3, the reaction product is centrifuged in a centrifuge at 10000 r / min for 3 min, and the supernatant is taken.

[0015] Preferably, 10 g of each of the red sandstone, gray sandstone and green mineral-bearing sandstone are taken and reacted with 20 mL of reaction medium.

[0016] Compared with the prior art, the method for confirming the uranium dissolution capacity of organic fluids of the present invention has the following advantages:

[0017] Beneficial effects:

[0018] (1) A method for confirming the uranium dissolution capacity of organic fluids has specific steps and strong operability;

[0019] (2) The experimental results of uranium dissolution in organic fluids are obvious, and the determined temperature range that is conducive to the dissolution of uranium in organic fluids is highly credible, providing first-hand experimental data support for uranium infiltration mineralization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A comparison chart showing the uranium leaching capacity of organic media at different temperatures for green mineral-bearing sandstone;

[0021] Figure 2 A comparison chart showing the uranium leaching capacity of organic media at different temperatures for red sandstone;

[0022] Figure 3 A comparison chart showing the uranium leaching capacity of organic media at different temperatures in gray sandstone. DETAILED DESCRIPTION

[0023] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0024] In order to further understand the present invention, the method for confirming the uranium dissolving capacity of organic fluid provided by the present invention is described in detail below in conjunction with examples, and the protection scope of the present invention is not limited by the following examples.

[0025] Example 1

[0026] Step (1) Red sandstone (SJQ03), gray sandstone (SJQ04), and green mineral-bearing sandstone (DY03) were collected from the Ordos region, and the uranium concentrations were analyzed by Element XR plasma mass spectrometer. The uranium contents were 1.45×10 -6 , 15.3×10 -6 ,208×10 -6 The samples were crushed to 40-60 mesh and cleaned by ultrasonic for 10 min to remove dust and burrs on the surface of the samples to improve the homogeneity of the samples. The cleaned samples were dried in a blast drying oven at 50°C for 6 hours.

[0027] Step (2) Uranium dissolution experiment in organic fluid under different temperature conditions.

[0028] Step (2.1) In a 1 L volumetric flask, use deionized water to prepare 2% of acetic acid, formic acid, imidazole, imidazolecarboxylic acid, pyridine, pyridinemethanol, humic acid and other seven experimental media.

[0029] Step (2.2) Take 10g of each of the red sandstone, gray sandstone and green mineral-bearing sandstone from the above step (1) and react with 20mL of the experimental medium respectively. The experimental device is a 50ml hydrothermal kettle. The organic fluid uranium dissolution experiment is carried out in a blast drying oven at 6 temperatures, including room temperature, 50°C, 80°C, 110°C, 130°C and 150°C. The experimental time is 2 days and 126 samples.

[0030] Step (3) After the experiment, the experimental medium was taken out and centrifuged in a centrifuge at 10000 r / min for 3 min, and the supernatant was taken. The medium after the experiment was analyzed for uranium concentration using an Element XR plasma mass spectrometer according to the analysis method of DZ / T 0064.80-1993.

[0031] Table 1 Uranium concentration in medium after organic fluid dissolution experiment

[0032]

[0033]

[0034] Step (4) Analyze and organize the above analytical data. The simulation experiment reveals the ability of organic fluid to leach uranium. Formic acid, humic acid, acetic acid and other organic acids have strong ability to leach uranium in red sandstone, gray sandstone and green mineral sandstone. At the same time, temperature affects the uranium leaching ability of organic acids. As the temperature increases, it generally shows a characteristic of first increasing and then decreasing. The maximum leaching amount is reached at 110°C. Figure 1 to Figure 3 shown.

[0035] The experiment verified that hydrocarbon fluids formed by thermal cracking of source rocks and oil and gas escape leached uranium and provided ore-forming materials for sandstone uranium mineralization. 110°C is most conducive to the dissolution of uranium in the formation by organic fluids, providing experimental data support for the "seepage" uranium mineralization.

[0036] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for determining the uranium dissolving capacity of an organic fluid, characterized in that: The following steps are involved: Step S1: collect red sandstone, gray sandstone, and green mineral-bearing sandstone, and pre-treat the three samples; Step S2: Uranium dissolution experiment in organic fluid under different temperature conditions, specifically including: Step S2-1: preparing reaction media respectively, wherein the reaction media are acetic acid, formic acid, imidazole, imidazolecarboxylic acid, pyridine, pyridinemethanol, and humic acid with a mass concentration of 2%; Step S2-2: taking the pretreated red sandstone, gray sandstone, and green mineral-bearing sandstone to react with seven reaction media respectively, and setting the reaction temperature to six temperature conditions of room temperature, 50° C., 80° C., 110° C., 130° C., and 150° C., and the reaction time is 2 days; Step S2-3: After the reaction is completed, the reaction product is centrifuged, and the supernatant is taken for uranium concentration analysis using an Element XR plasma mass spectrometer according to the analysis method of DZ / T0064.80-1993; Step S2-4: Analyze and organize the uranium concentration analysis data, combine the experimental temperature, explore the ability of organic fluid to dissolve and migrate uranium, and determine the effect of temperature on the dissolution of uranium in organic fluid.

2. The method for confirming the uranium dissolution capacity of organic fluid according to claim 1, characterized in that: The step 1 also includes: analyzing the uranium concentration using an Element XR plasma mass spectrometer.

3. The method for confirming the uranium dissolution capacity of organic fluid according to claim 1, characterized in that: The pretreatment method is as follows: the sample is crushed to 40-60 meshes, and ultrasonically cleaned for 10 minutes to remove dust and burrs on the surface of the sample; the cleaned sample is dried in a 50° C. forced air drying oven for 6 hours.

4. The method for confirming the uranium dissolution capacity of organic fluid according to claim 1, characterized in that: In the step S2-3, the reaction product is centrifuged in a centrifuge at 10000 r / min for 3 min, and the supernatant is taken.

5. The method for confirming the uranium solubility of organic fluid according to claim 1, characterized in that: 10 g of the red sandstone, gray sandstone and green mineral-bearing sandstone are respectively taken and reacted with 20 mL of reaction medium.

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