CN115406880A - Method for judging reducibility of hydrothermal uranium ore mineralization fluid - Google Patents
Method for judging reducibility of hydrothermal uranium ore mineralization fluid Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 121
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 58
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 21
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 63
- 239000011707 mineral Substances 0.000 claims abstract description 63
- 238000004458 analytical method Methods 0.000 claims abstract description 56
- 238000001069 Raman spectroscopy Methods 0.000 claims abstract description 29
- 238000004817 gas chromatography Methods 0.000 claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 31
- 239000012071 phase Substances 0.000 claims description 26
- 238000011161 development Methods 0.000 claims description 11
- 230000018109 developmental process Effects 0.000 claims description 11
- 229910021532 Calcite Inorganic materials 0.000 claims description 10
- 210000003000 inclusion body Anatomy 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 8
- 239000010436 fluorite Substances 0.000 claims description 8
- 239000010453 quartz Substances 0.000 claims description 8
- 239000007790 solid phase Substances 0.000 claims description 6
- 210000003462 vein Anatomy 0.000 claims description 6
- 230000002829 reductive effect Effects 0.000 claims description 5
- 238000004255 ion exchange chromatography Methods 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims 1
- 230000001603 reducing effect Effects 0.000 abstract description 10
- 239000011435 rock Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 3
- 238000001237 Raman spectrum Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000001089 mineralizing effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000272814 Anser sp. Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
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- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000011028 pyrite Substances 0.000 description 1
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
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- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/65—Raman scattering
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Abstract
The application relates to a method for analyzing a rock mass by means of physical and chemical properties of the rock mass, in particular to a method for judging the reducibility of a hydrothermal uranium ore mineralization fluid, which comprises the following steps: collecting gangue minerals symbiotic with uranium ores in uranium-containing ores; preparing a fluid inclusion sample and a powdery gangue sample from gangue minerals; performing component analysis on the fluid inclusion sample by using laser Raman spectroscopy; performing component analysis on a powdery gangue sample by using gas chromatography; and judging the reducibility of the ore-forming fluid based on the component analysis result, and determining that the ore-forming fluid of the uranium ore has reducibility when the component analysis result of any one of the fluid inclusion sample and the powdery gangue sample includes at least one characteristic reducing component. According to the method for judging the reducibility of the hot-type uranium ore mineralization fluid, the reducibility of the uranium ore mineralization fluid can be judged accurately and efficiently, and therefore exploration of the uranium ore is guided.
Description
Technical Field
The application relates to a method for analyzing rock mass by means of physical and chemical properties of the rock mass, in particular to a method for judging the reducibility of hydrothermal uranium ore forming fluid.
Background
The mineralization fluid has close relation with the formation of uranium ores, wherein the mineralization fluid refers to gases, liquids, silicate solutions and the like related to mineralization in geological action, and the mineralization fluid has an important control effect on migration, enrichment and precipitation of mineralization materials. For hydrothermal uranium ores, the existence of reductive ore forming fluid is an important mark for effectively indicating enrichment and prediction of uranium elements into ores and the ore forming depth, and a method capable of accurately and efficiently judging the reducibility of the hydrothermal uranium ore forming fluid is urgently needed to guide exploration of the uranium ores.
Disclosure of Invention
In view of the above, the present application is made to provide a method for determining reducibility of a hydrothermal uranium ore-forming fluid that overcomes or at least partially solves the above-mentioned problems.
Embodiments of the present application provide a method for determining reducibility of a hydrothermal uranium ore mineralization fluid, including: collecting gangue minerals symbiotic with uranium ores in uranium-containing ores; preparing the gangue minerals into a fluid inclusion sample and a powdered gangue sample; performing component analysis on the fluid inclusion sample by using laser Raman spectroscopy; performing component analysis on the powdery gangue sample by using gas chromatography; and judging the reducibility of the ore-forming fluid based on the component analysis result, and determining that the ore-forming fluid of the uranium ore has reducibility when the component analysis result of any one of the fluid inclusion sample and the powdery gangue sample includes at least one characteristic reducing component.
According to the method for judging the reducibility of the uranium ore mineralization fluid, the reducibility of the uranium ore mineralization fluid can be judged accurately and efficiently, and therefore exploration of uranium ores is guided.
Drawings
Fig. 1 is a flow chart of a method of determining reducibility of a hydrothermal uranium ore mineralization fluid according to an embodiment of the present application;
FIG. 2 is a graph illustrating gas phase composition analysis results of a laser Raman spectrum of a fluid inclusion sample according to embodiments of the present application;
fig. 3 is a solid phase composition analysis result of a laser raman spectroscopy of a fluid inclusion sample according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.
It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description refers to "first", "second", etc. throughout this document, these descriptions are only used for distinguishing similar objects, and should not be understood as indicating or implying relative importance, order or implied number of indicated technical features, it should be understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied.
An embodiment of the present application provides a method for determining reducibility of a hydrothermal uranium ore mineralization fluid, and with reference to fig. 1, the method includes:
step S102: and (3) collecting gangue minerals symbiotic with uranium ores in the uranium-containing ores.
Step S104: the gangue minerals are prepared into fluid inclusion samples and powdery gangue samples.
Step S106: performing a compositional analysis on the fluid inclusion sample using laser Raman spectroscopy.
Step S108: the powdered gangue samples were subjected to compositional analysis using gas chromatography.
Step S110: and judging the reducibility of the ore-forming fluid based on the result of the component analysis, and determining that the ore-forming fluid of the uranium ore has reducibility when the component analysis result of any one of the fluid inclusion sample and the powdery gangue sample includes at least one characteristic reducing component.
The hydrothermal type uranium ore refers to an enriched body of uranium formed by filling, substitution and the like of uranium-containing hot water solutions of different origins of uranium and mixed hot liquids thereof under appropriate physical conditions and various favorable geological conditions, and the uranium-containing hot water solutions and the mixed hot liquids thereof are hereinafter collectively referred to as an ore-forming fluid. Common hydrothermal uranium ores include granite-type uranium deposits, volcanic-type uranium deposits, and the like.
During the growth of the ore body, part of the mineralizing fluid is captured and wrapped in the ore body to form fluid inclusions, and the properties of the mineralizing fluid can be determined by means of the fluid inclusions. The state of the mineralized fluid when captured is determined by the pressure and temperature of the capture, but after being captured, the mineralized fluid will take on a plurality of phase states including gas, liquid and solid states as the temperature and pressure are reduced.
In this embodiment, the reducibility of the ore-forming fluid is determined by the fluid inclusion, and first, in step S102, gangue minerals coexisting with uranium ore are collected from the uranium-containing ore. The term uranium-bearing ore is used herein to refer to a uranium-bearing ore of a hydrothermal uranium deposit, which can be obtained by one skilled in the art using means customary in the art, without limitation.
The gangue minerals are minerals composed of useless solid substances associated with valuable minerals (in this example, valuable minerals are uranium ores) in the ore. The gangue minerals in some embodiments may include one or more of quartz, fluorite, calcite, and each type of gangue mineral may be collected separately.
As an example, in the process of collecting gangue minerals, not less than 3 blocks each of which may be 3cm × 6cm × 9cm in size and weighing not less than 1kg are required to be collected for each kind of gangue minerals to ensure that samples used in the component analysis can be prepared smoothly.
In step S104, the collected gangue minerals are required to be prepared into a fluid inclusion sample and a powdery gangue sample. Fluid inclusion body samples refer to fluid inclusion body sheets well known to those skilled in the art, and inclusions in the fluid inclusion body samples can be directly observed under a microscope. The powder gangue sample refers to powder gangue which is broken into a certain specification, and the powder gangue sample contains a large amount of fluid inclusions. The fluid inclusion sample and the powdered gangue sample can be prepared from the collected gangue minerals by those skilled in the art according to the related art, and several specific methods for preparing the fluid inclusion sample and the powdered gangue sample will be described in the following related sections, which will not be described herein again.
As described above, in some embodiments, a plurality of gangue minerals may be collected, and at this time, the fluid inclusion sample and the powdered gangue sample may be prepared separately for each gangue mineral, and accordingly, laser raman spectroscopy and gas chromatography may be performed on the prepared fluid inclusion sample and the powdered gangue sample, respectively.
In steps S106 and S108, the fluid inclusion sample is subjected to component analysis using laser raman spectroscopy, and the powdered gangue sample is subjected to component analysis using gas chromatography. The component analysis of the fluid inclusion sample and the component analysis of the powdered gangue sample have respective advantages, as described above, a single inclusion in the fluid inclusion sample can be observed under a microscope, so that a more refined and accurate analysis result can be obtained by analyzing the single inclusion in the fluid inclusion sample by using laser raman spectroscopy, and free ion components, solid phase components and the like can be analyzed. The powdery gangue sample contains a large number of inclusions, so that gas phase components of the ore-forming fluid in the inclusions can be released together and analyzed by using a gas chromatograph, the gas phase components in the inclusions can be obtained more comprehensively, and possible careless leakage caused by analyzing only part of the inclusions can be avoided.
In this embodiment, the fluid inclusion sample and the powdered gangue sample are prepared and subjected to component analysis, the two are complementary to each other, and when the component analysis result of any one of the fluid inclusion sample and the powdered gangue sample includes at least one characteristic reducing component, the mineral forming fluid can be determined to have reducing property, so that the efficiency and the accuracy of determining the reducing property of the mineral forming fluid are improved. The person skilled in the art can determine the reductive characteristic component according to the specific type of hydrothermal uranium ore, and by combining geological information of the region where the uranium ore is located and an ore-forming mechanism.
As an example, for a hydrothermal uranium ore, its characteristic reducing component may mainly comprise the gas phase component SO 2 、CO、NO、H 2 、H 2 S、C 2 H 6 、C 2 H 4 、C 3 H 8 、C 6 H 6 Solid phase component FeS 2 (pyrite), and free ion component NO 2 - 、NO 3 - 、SO 4 2- 、HCO 3 - And so on.
As described above, the reducing signature component includes a free ion component that can also be analyzed by laser raman spectroscopy, but in some cases may need to be converted to a free state by some experimental means, and thus, in some embodiments, ion chromatography may be further used to analyze the free ions in the fluid inclusion sample. It is understood that the laser raman spectroscopy may be used for analysis without destroying the structure of the inclusion, while the ion chromatography may be used for analysis without destroying the structure of the inclusion, and therefore, in some embodiments, the laser raman spectroscopy may be used for analysis, and after the analysis is completed, the fluid inclusion sample is subjected to relevant experimental treatment, and then the ion chromatography is used for analysis.
In some embodiments, when the gangue minerals are prepared into the fluid inclusion sample in step S104, the method may specifically include: the vein of the gangue minerals is defined in the collected gangue minerals, and then a sheet-like sample is collected in the defined vein, polished and taped to obtain a fluid inclusion sample.
As described above, for each kind of gangue minerals, not less than 3 blocks may be collected, each block may have a size of 3cm × 6cm × 9cm, and a pulse body may be defined in each collected gangue mineral, where the pulse body refers to a development site of the gangue mineral. As an example, after the vein is defined, a sheet-shaped sample can be collected at the vein, the thickness of the sheet-shaped sample can be 0.05 to 0.08mm, and after the sheet-shaped sample is polished on both sides, 502 glue is used for adhering the sheet to prepare a fluid inclusion sample. Likewise, not less than three fluid inclusion samples can be prepared for each gangue mineral, and those skilled in the art can prepare a suitable number of fluid inclusion samples of a suitable size in a suitable manner according to the relevant requirements of the experimental equipment used in the actual composition analysis, without limitation.
In some embodiments, the preparing the gangue minerals into the powdery gangue sample in step S104 may specifically include: the gangue minerals are crushed and sieved using a predetermined-sized screen, and then gangue is selected from the sieved gangue minerals to obtain a powdery gangue sample.
In particular, the collected gangue minerals may be crushed using suitable crushing means, for example using a jaw crusher or the like. After the crushing is finished, the crushed gangue minerals can be sieved, the sieving can be finished by using a standard sieve, as an example, the gangue minerals can be sieved by using an 80-mesh standard sieve, and then the gangue can be selected from the sieved gangue minerals, understandably, the gangue minerals inevitably comprise other impurities besides the gangue, so the gangue needs to be selected, the auxiliary selection can be performed by means of a binocular stereoscope and the like, the purity of the gangue in a powder gangue sample obtained after the selection can reach more than 99%, and the weight of the powder gangue sample at least reaches 1g to ensure that a sufficient number of inclusions are included. The skilled person can specifically choose which size of powder the gangue minerals are prepared to according to the requirements related to the experimental equipment used in the actual composition analysis, without being limited thereto.
In some embodiments, the fluid inclusion sample may be prepared first, and then the gangue minerals remaining after the fluid inclusion sample is prepared may be used to prepare the powdery gangue sample, and in particular, the gangue minerals remaining after the fluid inclusion sample is prepared may be crushed, sieved and selected to prepare the gangue sample, thereby reducing the amount of gangue minerals to be collected and improving the efficiency of judgment.
In some embodiments, the performing the composition analysis on the fluid inclusion sample by using the laser raman spectroscopy in step S106 may specifically include: the target inclusion is selected in the fluid inclusion sample using a microscope, and then the gas, liquid and solid phase components in the target inclusion are determined using laser raman spectroscopy.
It can be understood that the fluid inclusion sample still includes a plurality of inclusions, which can be observed under the microscope, and the laser raman spectroscopy can analyze a single inclusion, so that the target inclusion can be selected under the microscope for analysis, the selection criteria of the target inclusion can comprehensively consider a plurality of factors, such as the type of the inclusion, the size of the inclusion, the distribution of the inclusion, and the like, and a person skilled in the art can comprehensively select the target inclusion according to the actual conditions of the inclusion observed under the microscope, by combining the relevant parameters (such as the size of the laser beam) of the laser raman spectroscopy specifically used and the characteristics of the gangue minerals themselves, and then analyze the selected target inclusion by using the laser raman spectroscopy, so as to improve the analysis efficiency and the analysis accuracy.
As an example, one can choose to use a 20-fold or 50-fold objective lens of a microscope for under-lens viewing, raise or lower a barrel to view features of inclusions at different depths, and use a marker to delineate the target inclusion. When performing laser Raman spectroscopy, a micro laser Raman spectrometer can be selected, and 514.5nmAr is adopted + An ion laser excitation light source with 20mW of laser power, the minimum diameter of a laser beam spot of 1 mu m and the Raman shift range of 0-4000 cm -1 Resolution of 1 to 2cm -1 And the spectrum count time is 20s.
Several exemplary methods of target inclusion selection will be provided below, and one skilled in the art may use either alone or in combination to make the target inclusion selection.
In some embodiments, when selecting the target inclusion from the fluid inclusion sample, the method may specifically include: the method comprises the steps of determining the types of inclusions in a fluid inclusion sample by using a microscope, and then selecting at least one inclusion in each type of inclusions as a target inclusion, so that the component characteristics of the mineral fluid can be comprehensively reflected by laser Raman spectrum analysis.
In some embodiments, selecting a target inclusion in the fluid inclusion sample may specifically include: the distribution of inclusions in the fluid inclusion sample is determined using a microscope, and target inclusions are selected at locations where inclusions are concentrated and/or developed. Specifically, a person skilled in the art may move the objective lens to perform a longitudinal arrangement on the distribution of inclusions in the fluid inclusion sample, and then select a position where the distribution of the inclusions is concentrated to select the target inclusion, or select a position where the inclusions develop according to the general characteristics of the development of the inclusions to select the target inclusion, thereby improving the efficiency of selecting the target inclusion.
In some embodiments, selecting a target inclusion in the fluid inclusion sample may specifically include: determining the development depth of inclusions in the fluid inclusion sample by using a microscope, and selecting a target inclusion from the inclusions with the development depth meeting a preset condition. It is understood that too deep or too shallow inclusions will affect the analysis of the laser raman spectrum, and therefore, it is necessary to select inclusions with appropriate development depth according to the relevant requirements of the selected laser raman spectrum analysis equipment for analysis, and the appropriate development depth may be different for different types of gangue minerals, for example, for calcite, the optical properties are more specific, and 20 μm shallow inclusions are selected as target inclusions to prevent the laser raman spectrum curve from drifting to mask the spectrum peak of the reductive characteristic component.
In some embodiments, selecting a target inclusion in the fluid inclusion sample may specifically include: and determining the sizes of inclusions in the fluid inclusion sample by using a microscope, and selecting a target inclusion from the inclusions with the diameters larger than a preset value. Too large or too small a fluid inclusion can also affect the analysis of the laser raman spectrum, especially when the inclusion is too small to be smaller than the minimum diameter of the laser beam used for laser raman spectroscopy, and therefore, in some embodiments, the preset value is at least larger than the minimum diameter of the laser beam used for laser raman spectroscopy, and preferably at least 1 μm larger than the minimum diameter of the laser beam used for laser raman spectroscopy, so as to ensure the accuracy of the analysis result.
In some embodiments, selecting a target inclusion in the fluid inclusion sample may further comprise: the stability of the gas phase component in the selected target inclusion is determined using a microscope, and the target inclusion is reselected if the gas phase component in the target inclusion migrates. It will be appreciated that if gas phase components in the inclusions are migrated during the laser raman spectroscopy analysis, the analysis may fail, and for this reason, after the target inclusion is selected, the target inclusion may be observed under a microscope for a period of time to determine the stability of the selected target inclusion, and if the gas phase components in the target inclusion are migrated, the target inclusion may need to be reselected.
In some embodiments, as described above, when analyzing the powdered gangue sample by using the gas chromatography, it is required to release the gas phase components in the plurality of inclusions in the powdered gangue sample first, and the gas phase components in the powdered gangue sample can be released by subjecting the powdered gangue sample to the decrepitation treatment and then analyzing the released gas phase components by using the gas chromatography. One skilled in the art can select a suitable bursting device to release the gas phase component from the powdered gangue sample according to actual conditions, or can use other methods to release the gas phase component from the powdered gangue sample, which is not limited in this respect.
One or more of the embodiments referred to above will now be described in greater detail and in greater detail with reference to the reduction determination performed by a uranium deposit mineralizing fluid from a phase mountain uranium mine.
The Zhoushan uranium deposit is located in the west of the Yangshan uranium deposit, and is located at the north end of the Zhoushan-cave crumpled fracture zone, the mineralization zone is mainly formed in crushed maculopathic rocks in the ridges of the lower chalky goose lake, and gangue minerals closely symbiotic with uranium mineralization are mainly quartz, calcite and fluorite. Therefore, quartz, calcite and fluorite which are closely symbiotic with uranium ore are collected firstly, 3 blocks of each quartz, calcite and fluorite are taken, the size of each block is about 3cm multiplied by 6cm multiplied by 9cm, and the weight reaches 1kg, so that the preparation of the sample can be successfully completed.
Next, the collected quartz, calcite and fluorite are respectively made into fluid inclusion samples, firstly, a marking pen is used for delineating a main gangue development part in the collected gangue minerals, a sheet-shaped sample is collected at the part, the thickness of the sheet-shaped sample is 0.05 to 0.08mm, the two sides of the sheet-shaped sample are polished, 502 glue is used for adhering the sheet to form the fluid inclusion sample, and 3 fluid inclusion samples are respectively ground aiming at the quartz, the calcite and the fluorite.
Further, crushing the residual gangue minerals for preparing the fluid inclusion body sample by using a jaw crusher, screening the crushed sample by using a standard sieve, enabling the crushed sample to pass through an 80-mesh standard sieve, finely picking the sample by using a binocular stereoscope after screening, and selecting powdery gangue samples of quartz, calcite and fluorite, wherein the purity of a single mineral is up to more than 99%, and the weight of the sample is up to 1g.
Next, a microscope is used to select a target inclusion in the fluid inclusion sample, first, the size, type, distribution rules, etc. of the inclusions are determined, and the target inclusion is delineated using a marker. The target inclusion should cover all inclusion types in the test sample, with a size greater than 1 μm of the minimum diameter of the laser beam spot, and moderate depth of development, which for calcite should be shallow at 20 μm. Then, the composition analysis was performed using a micro laser Raman spectrometer using 514.5nmAr + An ion laser excitation light source with 20mW of laser power, the minimum diameter of a laser beam spot of 1 mu m and the Raman shift range of 0-4000 cm -1 Resolution of 1 to 2cm -1 And the spectrum counting time is 20s.
In this example, the specific analysis result of the laser raman spectroscopy was that the gas phase component of the mineral-forming fluid contained CH 4 、N 2 、CO 2 、H 2 S, H is shown in the curve 20 of FIG. 2 2 Absorption peak 21 of S, liquid phase component mainly being H 2 O, solid phase mineral containing FeS 2 FeS is shown in curve 30 of FIG. 3 2 Absorption peak 31 of (1).
Next, the powdery gangue sample was subjected to composition analysis using gas chromatography, using a gas chromatograph and a thermal decrepitation furnace, with the decrepitation temperature set at 500 ℃, to obtain the gas phase components in the powdery gangue sample by the decrepitation method, and the gas phase component content was measured by the gas chromatograph.
According to the gas chromatographic analysis result, the gas phase component of the fluid inclusion in the uranium deposits in the Zhoushan contains CH 4 、C 2 H 2 + C 2 H 4 、C 2 H 6 、CO 2 、H 2 O、O 2 、N 2 CO, see table below for details.
Fluid inclusion gas phase component (x 10) of Zhouzhai mountain deposit in Renshan mountain -6 ）
And (3) integrating the analysis results of the laser Raman spectrum and the gas chromatography to obtain the gas phase components of the mineral fluid at the position, wherein the gas phase components comprise: CH (CH) 4 、C 2 H 2 + C 2 H 4 、C 2 H 6 、CO 2 、H 2 O、O 2 、N 2 、CO、H 2 And S. Wherein H 2 S appears only in the results of analysis of laser Raman spectra, and C 2 H 2 + C 2 H 4 、C 2 H 6 、O 2 、N 2 CO appears only in the results of gas chromatography analysis, and the complementarity of the two analysis results can be seen.
Finally, the reducibility characteristics determined in this example include: SO 2 、CO、NO、H 2 、H 2 S、C 2 H 6 、C 2 H 4 、C 3 H 8 、C 6 H 6 、NO 2 - 、NO 3 - 、SO 4 2- 、HCO 3 - And the analysis result of the above components shows that H appears 2 S、C 2 H 2 + C 2 H 4、 C 2 H 6、 CO、FeS 2 Thus, the uranium mineralization fluid in a uranium deposit in a zhoushan mountain is determined to be a reducing fluid.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The present invention may be practiced without these particulars.
Claims (15)
1. A method for determining reducibility of a hydrothermal uranium ore mineralization fluid, comprising:
collecting gangue minerals symbiotic with uranium ores in uranium-containing ores;
preparing the gangue minerals into a fluid inclusion sample and a powdered gangue sample;
performing component analysis on the fluid inclusion sample by using laser Raman spectroscopy;
performing component analysis on the powdery gangue sample by using gas chromatography;
and judging the reducibility of the mineralization fluid based on the component analysis result, and determining that the mineralization fluid of the uranium ore has reducibility when the component analysis result of any one of the fluid inclusion sample and the powdery gangue sample comprises at least one reducibility characteristic component.
2. The method of claim 1, further comprising:
performing a compositional analysis on the fluid inclusion sample using ion chromatography.
3. The method of claim 1 or 2, wherein the gangue minerals comprise one or more of:
quartz, fluorite and calcite;
the preparing the gangue minerals into fluid inclusion samples and powdered gangue samples comprises:
each of the gangue minerals was prepared separately as a fluid inclusion sample and a powdered gangue sample.
4. The method of claim 1, wherein preparing the gangue minerals into fluid inclusion bodies samples comprises:
delineating the vein of the gangue minerals within the collected gangue minerals;
collecting a sheet sample in the delineated vein body, polishing and sticking the sheet to obtain a fluid inclusion sample.
5. The method of claim 1, wherein preparing the gangue minerals into a powdered gangue sample comprises:
crushing the gangue minerals and sieving the crushed gangue minerals by using a sieve with a preset size;
selecting gangue from the gangue minerals after sieving to obtain a powdery gangue sample.
6. The method of claim 5, wherein breaking the gangue minerals comprises:
breaking up the gangue minerals remaining after preparation of the fluid inclusion sample.
7. The method of claim 1, wherein performing a compositional analysis on the fluid inclusion sample using laser Raman spectroscopy comprises:
selecting a target inclusion in the fluid inclusion sample using a microscope;
determining gas, liquid and solid phase components in the target inclusion using laser Raman spectroscopy.
8. The method of claim 7, wherein the selecting a target inclusion in the fluid inclusion body sample using a microscope comprises:
determining the type of inclusion in the fluid inclusion sample using a microscope;
at least one inclusion of each category is selected as the target inclusion, respectively.
9. The method of claim 7, wherein the selecting a target inclusion in the fluid inclusion body sample using a microscope comprises:
determining distribution of inclusions in the fluid inclusion sample by using a microscope;
selecting the target inclusion at a location of the inclusion focus and/or development.
10. The method of claim 7, wherein the selecting a target inclusion in the fluid inclusion body sample using a microscope comprises:
determining the development depth of inclusion in the fluid inclusion sample using a microscope;
and selecting the target inclusion from the inclusions with the development depth meeting the preset condition.
11. The method of claim 7, wherein the selecting a target inclusion in the fluid inclusion body sample using a microscope comprises:
determining the size of inclusions in the fluid inclusion sample using a microscope;
selecting the target inclusion from the inclusions with a diameter greater than a preset value.
12. The method of claim 11, wherein the predetermined value is at least greater than a minimum diameter of a laser beam used for the laser raman spectroscopy.
13. The method of any of claims 7-12, wherein the selecting a target inclusion in the fluid inclusion body sample using a microscope further comprises:
determining the stability of gas phase components in the target inclusion by using a microscope;
and if the gas-phase components in the target inclusion are migrated, reselecting the target inclusion.
14. The method of claim 1, wherein the component analysis of the powdered gangue sample using gas chromatography:
subjecting the powdered gangue sample to a decrepitation treatment to release gas phase components in the powdered gangue sample;
the gas phase components in the powdered gangue samples were analyzed using gas chromatography.
15. The method of claim 1, wherein the reductive characteristic component comprises:
SO 2 、CO、NO、H 2 、H 2 S、C 2 H 6 、C 2 H 4 、C 3 H 8 、C 6 H 6 、FeS 2 、NO 2 - 、NO 3 - 、SO 4 2- 、HCO 3 - 。
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