CN111044548A - Method for judging uranium content of granite by using content of major elements - Google Patents

Method for judging uranium content of granite by using content of major elements Download PDF

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CN111044548A
CN111044548A CN201911330029.5A CN201911330029A CN111044548A CN 111044548 A CN111044548 A CN 111044548A CN 201911330029 A CN201911330029 A CN 201911330029A CN 111044548 A CN111044548 A CN 111044548A
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granite
uranium
content
sample
rock mass
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郭建
李子颖
黄志�
李秀珍
张玉燕
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Beijing Research Institute of Uranium Geology
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Beijing Research Institute of Uranium Geology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
    • G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
    • G01N23/2202—Preparing specimens therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials

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Abstract

The invention belongs to the technical field of uranium ore geology and resource evaluation, and particularly relates to a method for judging the uranium content of granite by using the content of major elements2、Fe2O3、MgO、CaO、TiO2、P2O5、Na2O, F A geochemical discriminant equation of rocks with eight main component contents is used for carrying out geochemical analysis of main element on a target rock mass, substituting the analysis result into the discriminant equation and further carrying out uranium content discrimination on an unknown rock mass. The method has an important guiding function on the geochemical research and the exploration and evaluation work of the uranium deposit, provides support for quantitative prediction of the uranium-producing rock mass, and has a wide popularization and application prospect.

Description

Method for judging uranium content of granite by using content of major elements
Technical Field
The invention belongs to the technical field of uranium ore geology and resource evaluation, and particularly relates to a method for judging the uranium content of granite by using the content of major elements.
Background
With the development of mathematical geology and pattern recognition, more and more comprehensive mathematical statistics methods are applied to geological data analysis processing. Early researches on rock mineralization identification are mostly judged by using simple or single mathematical models, the models are simple in algorithm structure and long in training time, more importantly, complex correlation in high-dimensional variables is difficult to accurately reflect, or the variable dimensions are too large and fall into mechanical mathematical calculation, so that specific application in solving practical problems is weakened. The principal component elements are the most direct reflection of the geochemical characteristics and properties of main granite rocks, the uranium content of the granite is judged as a target by utilizing principal component analysis, and the relevant principal components which can reflect the geochemical characteristics of the rocks most are extracted from the geochemical data variables of the rocks, so that the geochemical information represented by the original variables can be comprehensively and effectively reflected, and the uranium content of the target rock mass is judged.
Therefore, a method for determining the uranium content of granite by using the content of the major elements is needed to solve the defects of the prior art.
Disclosure of Invention
The invention aims to provide a method for judging the uranium content of granite by utilizing the content of major elements, which utilizes SiO-based method constructed under the condition that a great amount of related information of different rocks with different mineralities is known2、Fe2O3、MgO、CaO、TiO2、P2O5、Na2O, F A geochemical discriminant equation of rocks with eight main component contents is used for carrying out geochemical analysis of main element on a target rock mass, substituting the analysis result into the discriminant equation and further carrying out uranium content discrimination on an unknown rock mass.
The technical scheme of the invention is as follows:
a method for judging the uranium content of granite by using the content of major elements specifically comprises the following steps:
step (1), field investigation is carried out, and a target rock granite sample is collected;
step (2) processing and preparing the granite sample collected in the step (1) by adopting a pollution-free scheme;
step (3) carrying out geochemical analysis on the main element of the granite sample prepared in the step (2);
substituting the collected sample test data obtained in the step (3) into a principal component element discriminant equation;
and (5) carrying out granite uranium content evaluation by using the granite uranium content evaluation parameter D value obtained in the step (4).
The sample in the step (1) is required to be fresh, generally 3X 6X 9cm, and the total weight of the sample is 0.5 kg.
The specific operation in the step (2) is as follows: coarsely crushing a granite sample to 2-3 mm by using a corundum jaw crusher, and uniformly mixing; then, dividing, and taking about 50g as a secondary sample; 100g of the sample was finely ground to less than 200 mesh using an agate ball mill to obtain an analytical test sample.
In the step (3), an AB-104L and PW 2404X-ray fluorescence spectrometer is used for measuring the main elements of granite, and the main elements for testing comprise SiO2、CaO、Al2O3、MgO、P2O5、MnO、TiO2、K2O、Na2O、Fe2O3、FeO。
And (4) in the step (3), obtaining the content of the fluorine element by using an acidimeter.
In the step (4), SiO is added2、Fe2O3、MgO、CaO、Na2O、TiO2And substituting the numerical value of the element F into an equation, and further obtaining a value D of the uranium-bearing granite evaluation parameter.
D＝0.459(SiO2)+1.208(Fe2O3)+0.254(MgO)+0.384(CaO)+0.851(Na2O)-0.576(TiO2)+0.168(F)
The evaluation standard in the step (5) is that when D is larger than 39.71, the target rock mass is determined to be a non-uranium-producing rock mass; and when D is less than 39.71, determining the target rock mass as a uranium-producing rock mass.
The invention has the beneficial effects that:
(1) the invention has the advantages of sample object collection, clear analysis and test requirements and strong operability.
(2) The invention is based on the use of principal component analysis, using SiO-based2、Fe2O3、MgO、CaO、TiO2、P2O5、Na2O, F the geochemistry discriminant equation of uranium producing rock mass with eight element contents, by comparing the relation between the D value of the target rock mass and the critical value 39.71, the uranium-bearing characteristic of the target rock mass is discriminated, which has important guiding function for the geochemistry research and investigation evaluation work of uranium mineralization, and provides support for quantitative prediction of uranium producing rock mass, and has wide popularization and application prospect.
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FIG. 1 is a flow chart of a method for determining the uranium content of granite by using the content of major elements according to the present invention;
Detailed Description
The invention will be further described with reference to the following figures and examples:
the invention provides a method for judging the uranium content of granite by using the content of major elements, which is further described in detail by taking the example that the uranium content of the peach rock mass in the Yunnan Longling area is judged by calculating the major elements, and the method specifically comprises the following steps:
the method comprises the following steps of (1) collecting 5 fine-grain dimovite granite samples in the peach forest rock mass main body in the Yunnan Longling area, wherein the granite samples are fresh, weatherless and hydrothermally altered.
And (2) processing and preparing all the samples collected in the step (1) by completely adopting a pollution-free processing scheme.
And coarsely crushing each sample to 2-3 mm by using a corundum jaw crusher, and uniformly mixing. Then, the sample was fractionated, and about 50g was taken as a side sample. And (3) taking 100g of the rock mass, and finely grinding the rock mass to be less than 200 meshes by using an agate ball mill to prepare a chemical analysis sample of the Hua Tao Lin rock mass dimovite granite rock.
And (3) sending the granite sample prepared in the step (2) to an analysis test center of Beijing geological research institute of nuclear industry for main element geochemical analysis.
According to GB/T14506.28-2010 part 28 of the silicate rock chemical analysis method: 16 major and minor component determination, and determining granite major and minor elements by AB-104L and PW 2404X-ray fluorescence spectrometer2、CaO、Al2O3、MgO、P2O5、MnO、TiO2、K2O、Na2O、Fe2O3And FeO. According to GB/T14506.12-2010 silicate rock analysis method and ion selective electrode method for measuring fluorine content, the fluorine content is obtained by using an acidimeter.
And (4) substituting the main quantity element data (shown in table 1) obtained by testing and analyzing 5 granite samples collected in the forest area of the Huatao province in Yunnan province obtained in the step (3) into a discriminant equation.
D＝0.459(SiO2)+1.208(Fe2O3)+0.254(MgO)+0.384(CaO)+0.851(Na2O)-0.576(TiO2)+0.168(F)
And (5) carrying out granite uranium content evaluation by using the granite uranium content evaluation parameter D value obtained in the step (4). The discrimination value D of the sample U12-13 was calculated to be 39.06252<39.71, the discrimination value D of the sample U20-1 was calculated to be 39.66<39.71, the discrimination value D of the sample U20-3 was calculated to be 38.94<39.71, the discrimination value D of the sample U20-4 was calculated to be 39.24<39.71, and the discrimination value D of the sample U41-9 was calculated to be 39.03< 39.71. And (5) integrating the discrimination results of the samples, and considering the Hua Tao Lin granite as a uranium-producing rock mass.
The present invention has been described in detail with reference to the embodiments, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. The prior art can be adopted in the content which is not described in detail in the invention.
TABLE 1 Main ingredient element analysis data table of Hua Tao Lin rock granite
Sample number SiO2 Fe2O3 MgO CaO Na2O TiO2 F
U12-13 72.9 2.39 0.439 0.911 2.82 0.288 0.114
U20-1 75.73 1.74 0.291 0.543 2.99 0.076 0.089
U20-3 75.59 1.7 0.282 0.377 2.37 0.084 0.063
U20-4 75.17 1.91 0.367 0.439 2.62 0.13 0,076
U41-9 73.27 2.24 0.474 1.23 2.61 0.263 0.113

Claims (7)

1. A method for judging the uranium content of granite by using the content of major elements is characterized by comprising the following steps:
step (1), field investigation is carried out, and a target rock granite sample is collected;
step (2) processing and preparing the granite sample collected in the step (1) by adopting a pollution-free scheme;
step (3) carrying out geochemical analysis on the main element of the granite sample prepared in the step (2);
substituting the collected sample test data obtained in the step (3) into a principal component element discriminant equation;
and (5) carrying out granite uranium content evaluation by using the granite uranium content evaluation parameter D value obtained in the step (4).
2. The method for discriminating the uranium content of granite according to claim 1, wherein: the sample in the step (1) is required to be fresh, generally 3X 6X 9cm, and the total weight of the sample is 0.5 kg.
3. The method for discriminating the uranium content of granite according to claim 2, wherein: coarsely crushing the granite sample in the step (2) to 2-3 mm by using a corundum jaw crusher, and uniformly mixing; then, dividing, and taking about 50g as a secondary sample; 100g of the sample was finely ground to less than 200 mesh using an agate ball mill to obtain an analytical test sample.
4. The method for discriminating the uranium content of granite according to claim 3, wherein: in the step (3), an AB-104L and PW2404X ray fluorescence spectrometer is used for measuring the main element of granite, and the main element for testing comprises SiO2、CaO、Al2O3、MgO、P2O5、MnO、TiO2、K2O、Na2O、Fe2O3、FeO。
5. The method for discriminating the uranium content of granite according to claim 4, wherein: and (4) in the step (3), obtaining the content of the fluorine element by using an acidimeter.
6. The method for discriminating the uranium content of granite according to claim 5, wherein: in the step (4), SiO is added2、Fe2O3、MgO、CaO、Na2O、TiO2And substituting the numerical value of the element F into an equation, and further obtaining a value D of the uranium-bearing granite evaluation parameter.
D＝0.459(SiO2)+1.208(Fe2O3)+0.254(MgO)+0.384(CaO)+0.851(Na2O)-0.576(TiO2)+0.168(F)
7. The method for discriminating the uranium content of granite according to claim 6, wherein: the evaluation standard in the step (5) is that when D is larger than 39.71, the target rock mass is determined to be a non-uranium-producing rock mass; and when D is less than 39.71, determining the target rock mass as a uranium-producing rock mass.
CN201911330029.5A 2019-12-20 2019-12-20 Method for judging uranium content of granite by using content of major elements Pending CN111044548A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112382349A (en) * 2020-11-10 2021-02-19 中国石油大学(华东) Method for judging origin of basalt from EM I type or EM II type mantle
CN114384100A (en) * 2021-12-10 2022-04-22 核工业北京地质研究院 Element geochemistry discrimination method beneficial to uranium mineralization granite

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CN107632036A (en) * 2017-08-04 2018-01-26 核工业北京地质研究院 A kind of lithogeochemical method for identifying sodic-metasomatism type uranium deposit bed
US20180031732A1 (en) * 2015-02-13 2018-02-01 Schlumberger Technology Corporation Diagenetic and Depositional Rock Analysis
CN109270589A (en) * 2018-10-09 2019-01-25 核工业北京地质研究院 A kind of localization method of sandstone-type uranium mineralization with respect Beneficial Ore-forming Petrographic zone

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Publication number Priority date Publication date Assignee Title
CN104678452A (en) * 2013-11-28 2015-06-03 核工业北京地质研究院 Method for quantitatively evaluating ore-forming contribution degree of uranium resource body for sandstone type uranium ore
US20180031732A1 (en) * 2015-02-13 2018-02-01 Schlumberger Technology Corporation Diagenetic and Depositional Rock Analysis
CN107632036A (en) * 2017-08-04 2018-01-26 核工业北京地质研究院 A kind of lithogeochemical method for identifying sodic-metasomatism type uranium deposit bed
CN109270589A (en) * 2018-10-09 2019-01-25 核工业北京地质研究院 A kind of localization method of sandstone-type uranium mineralization with respect Beneficial Ore-forming Petrographic zone

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112382349A (en) * 2020-11-10 2021-02-19 中国石油大学(华东) Method for judging origin of basalt from EM I type or EM II type mantle
CN112382349B (en) * 2020-11-10 2022-03-25 中国石油大学(华东) Method for judging origin of basalt from EM I type or EM II type mantle
CN114384100A (en) * 2021-12-10 2022-04-22 核工业北京地质研究院 Element geochemistry discrimination method beneficial to uranium mineralization granite

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Application publication date: 20200421