阅读说明：本技术 一种划分地浸砂岩型铀矿岩石后生蚀变的环境指标方法 (Environmental index method for rock after-alteration of divided land-leaching sandstone-type uranium ores ) 是由 陈霜 王文旭 吴金钟 申科峰 彭云彪 于 2018-09-10 设计创作，主要内容包括：本发明涉及矿产地质勘查技术领域,具体公开了一种划分地浸砂岩型铀矿岩石后生蚀变的环境指标方法。该方法包括：1、设置岩石环境指标样品；2、进行野外实地采样；3、进行样品的实验分析,在完成样品取样后,及时将样品送入实验室,进行岩石比电位测定ΔEh、低价硫S<Sup>2-</Sup>分析以及有机碳Cy分析；4、对实验数据分析整理利用。该方法选择受空气影响小的岩石比电位ΔEh、低价硫S<Sup>2-</Sup>和有机碳Cy等3种岩石环境指标分析数据进行组合判断,可准确判断岩石地球化学环境,确定岩石后生蚀变强弱,实现对地浸砂岩型铀矿岩石后生蚀变带的分带性的研判与划分,并结合定量伽玛测井数据,分析含铀性和铀的富集因素,达到精准扑捉铀矿赋存部位。(The invention relates to the technical field of mineral geological exploration, and particularly discloses an environmental index method for after-corrosion of divided placer-leaching type uranium ore rocks. The method comprises the following steps: 1. setting a rock environment index sample; 2. sampling in the field; 3. carrying out experimental analysis on the sample, sending the sample into a laboratory in time after sampling the sample, and carrying out rock specific potential determination on delta Eh and low-valent sulfur S 2‑ Analysis and organic carbon Cy analysis; 4. for experimental numberAnd (6) analyzing, sorting and utilizing. The method selects rock specific potential delta Eh and low-valence sulfur S which are less influenced by air 2‑ And 3 rock environment index analysis data such as organic carbon Cy and the like are combined and judged, the geochemical environment of the rock can be accurately judged, the strength of the after-growth change of the rock is determined, the research and judgment and the division of the zonation of the after-growth change zone of the rock of the ground dunite type uranium ore are realized, and the enrichment factors of uranium-bearing property and uranium are analyzed by combining quantitative gamma logging data, so that the uranium ore occurrence part can be accurately captured.)

1. An environmental index method for the rock after-alteration of a divided land-leaching sandstone-type uranium ore is characterized by comprising the following steps of: the method specifically comprises the following steps:

step 1, setting a rock environment index sample

Reasonably laying rock environment index samples according to the properties, stages and target tasks of the in-situ leaching sandstone uranium ore belt drilling evaluation or exploration project, the geological working status, the geological background and the mineralization condition, drawing a sampling design drawing, and explaining a sampling method, requirements and an executed rule;

step 2, field sampling is carried out

Step 3, carrying out experimental analysis on the sample

After the sampling of the sample is finished, the sample is sent into a laboratory in time to carry out the specific potential △ Eh determination of the rock and the low-valence sulfur S^2-Analysis and organic carbon Cy;

step 4, analyzing, sorting and utilizing laboratory test analysis data

After receiving a test analysis report given by a laboratory, carrying out classified statistics on data, quantifying a rock primary environment index background value, comparing the change condition of rock secondary alteration environment indexes, judging the type and the period of the secondary alteration, finding out a mutation part between the rock with the original non-altered reduction and the rock with strongest ore-controlling secondary oxidation alteration, analyzing reduction factors for enriching uranium precipitates, carrying out secondary oxidation alteration zoning and division, and providing a reliable data basis for delineating the front line of an oxidation zone.

2. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 1, wherein: the step 1 specifically comprises:

step 1.1, establishing a sampling sample design principle;

on the basis of collecting and sorting the previous samples, classified sampling of the same region (or section), the same layer, the same sand body, the same lithology, the same color and the same environment is realized according to the rock after-corrosion change and ore finding conditions;

step 1.2, determining a sampling object;

the main object of definite sampling is to find a uranium target layer, the key point of the target layer is a sand body, the key point of the sand body is the anagenetic alteration sandstone, and the key point of the anagenetic alteration sandstone is the ore-bearing sandstone of a mutation part;

step 1.3, obtaining background data of a native rock environmental index sample of a uranium finding target layer;

step 1.4, determining sampling key points and determining a sampling mode;

step 1.5, select appropriate weight of sample for subsequent chemical analysis

Taking a rock core sample with the weight of more than 300g, and simultaneously analyzing or selectively analyzing the specific potential delta Eh and the low-valent sulfur S of the rock according to the geochemical type of the rock^2-And organic carbon Cy.

3. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 1, wherein: the step 2 of field sampling specifically comprises the following steps:

2.1, selecting a sampling tool;

step 2.2, sampling a sample;

2.2.1, sampling samples after drilling is finished;

after drilling, the core is taken out from the core box and put on the spread canvas, the sampling position and the sample length are taken by tape measure by using a core splitting or block picking sampling mode, the mud skin is removed by a scraper, the core is split by a geological hammer or a manual core splitter as appropriate, half of the core is packed into a plastic bag for sealing, and the other half is put back to the core box.

And 2.2.2, selecting a sample with proper weight, and labeling the sample.

4. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 1, wherein: when the sample experiment analysis is carried out in the step 3, the rock and ore sample is crushed to phi 0.25mm, the same sample is divided into two samples with the same positive and negative, the positive sample is analyzed, the negative sample is retained, and the rock specific potential determination, the low-valence sulfur analysis and the organic carbon analysis are carried out;

the specific rock potential measuring method comprises the following specific steps:

step 3.1, specific potential measurement is carried out on the sample

Step 3.1.1 preparation of Potassium permanganate solution

Preparing a potassium permanganate solution according to the proportion of 1L of distilled water, 10ml of 10% potassium hydroxide solution and 5g of potassium permanganate, and standing for 7-10 days until the solution is stable;

step 3.1.2, measuring the specific potential △ Eh of the rock;

putting 10g of crushed sample into a beaker A, adding 100ml of prepared potassium permanganate solution, directly adding 100ml of prepared potassium permanganate solution into another empty beaker B, uniformly stirring, respectively measuring Eh samples and Eh empty values of the solutions in the two beakers every 1, 3, 5, 10 and 24 hours, reading 3-5 data each time, taking the average value as the result until the result is stable, and obtaining the rock specific potential △ Eh ═ Eh_{Sample (A)}－Eh_{Air conditioner}Wherein, Eh_{Sample (A)}Eh value determined for a sample beaker; eh_{Air conditioner}Eh values determined for a no-sample beaker.

5. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 2, wherein: the step 1.3 of obtaining background data of the environmental index sample of the native rock of the uranium finding target layer comprises the following steps:

in each region or section, the geochemical types of the rock colors of primary rocks of a uranium target layer and secondary altered rocks are found out firstly, and then, corresponding samples are designed pertinently according to different types aiming at meeting the requirement of background value analysis, and the samples are designed comprehensively for drilling holes on a main section so as to facilitate contrastive analysis and consider other auxiliary sections and drilling holes with special geological phenomena.

6. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 2, wherein: the step 1.4 is to determine the sampling emphasis and the sampling mode as follows:

after the background data of the primary rock environment index sample of the uranium finding target layer is mastered, sampling is mainly put on the metaplasia rock, and the sampling is respectively carried out according to the metaplasia strength, the type and the zonation superimposed on the sand body of the uranium finding target layer, the mineralization position, the type, the grade and the like; the core of the ore section can be used as a rock environment index sample in a uranium radium basic analysis sample as appropriate, and sampling is carried out in a split core mode; the post-alteration core was sampled in a block picking fashion.

7. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 3, wherein: the step 2.2.2 selects a sample with a proper weight, and the specific steps for labeling the sample are as follows:

weighing the weight of the sample by using an electronic scale, measuring the strength of the sample by using an β + gamma recorder, filling the sample into a label, wherein the sample cannot be mixed with rocks of different rock colors and geochemical types, and the characteristic minerals such as carbon dust, pyrite and the like seen by naked eyes and special geological phenomena need to be described and recorded in the label, perfecting the lithology, numbering and analysis item label contents of the sample in duplicate, wherein one part is reserved, the other part is put into a cloth sample bag together with the sample in the plastic bag, and the sample number is clearly written on the cloth sample bag by using a marker pen after the sample is sealed.

8. The environmental index method for the metaverse sandstone-type uranium ore rock after-corrosion according to claim 3, wherein the sampling tool selected in the step 2.1 comprises canvas, a measuring tape, a scraper, a geological hammer, a manual core splitter, a label, a plastic bag, an electronic scale, an β + gamma recorder, a cloth sample bag and a marker pen.

9. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 3, wherein: in the step 2.2.1, the sample sampled after the drilling is finished must be cleared of the mud skin of the core, and the core impregnated with mud cannot be adopted.

10. The environmental index method for the occurrence of the alteration of the uranium ore rock of the compartmentalized sandstone type according to claim 4, wherein: the low-valent sulfur S is carried out in the step 3^2-The specific steps of analysis and organic carbon Cy analysis were:

step 3.2, carrying out low-valent sulfur S on the sample^2-Analysis of

Low sulfur S of the sample^2-The sulfur-containing material is characterized by comprising (1) total sulfur- (natural sulfur + sulfate sulfur), wherein the total sulfur is obtained by gravimetric analysis, and the natural sulfur and the sulfate sulfur are obtained by combustion analysis;

step 3.3, organic carbon Cy analysis of the sample

Organic carbon Cy ═ total carbon C of sample_{General assembly}Inorganic carbon C_{Is free of}And can be obtained by non-aqueous titration analysis.

Technical Field

The invention belongs to the technical field of mineral geological exploration, and particularly relates to an environmental index method for occurrence of corrosion after rock of a partitioned sandstone-leaching type uranium ore.

Background

Because the in-situ leaching sandstone type uranium ore has the advantages of economy, easy mining and environmental protection, the in-situ leaching sandstone type uranium ore becomes an important type of the world natural uranium supply market and is widely valued by countries in the world. The most key technology for searching the type of uranium ore is the rock geochemical environment index (hereinafter referred to as the "environment index") dividing technology for the strong and weak zonation of the in-situ leaching sandstone type uranium ore after rock erosion. By the technology, the mineralization part, namely an oxidation zone front line or an oxidation-reduction interface, can be quickly, accurately, practically and effectively defined, so that the mineralization rate and the hole distribution efficiency are improved.

The rock retrogradation of the in-situ leaching sandstone type uranium ore is an important ore finding mark and an ore forming condition for searching the type of uranium ore, and the root cause of the rock degeneration is the water-rock effect. After the basin cover layer is formed into rock, the infiltrated water from the supply area enters an in-situ sandstone type uranium deposit rock (mainly referring to a water-containing sandstone layer, and then a small amount of a local water-resisting interlayer and a top and bottom plate water-resisting layer are included, and the same is applied below) permeable layer, and in the process of transporting to the drainage area, ions and compounds are brought out, so that the material composition of the rock is changed greatly. The most intuitive expression of the change is the change of the rock color, the most direct quantifiable data change is the change of the rock environment index, and accordingly, the change of the rock change strength can be divided into the change zones.

According to the geochemical environmental signs of minerals of the underground water oxidation-reduction environment of the after-alteration of the in-situ leaching sandstone-type uranium ore rocks, the after-alteration of the in-situ leaching sandstone-type uranium ore rocks can be generally divided into the categories of after-alteration oxidation and after-alteration reduction 2. The metaplasia oxidation alteration can be further divided into diving oxidation alteration, interlayer oxidation alteration and diving-interlayer oxidation alteration 3 types; the metaplastic reductive alterations can be further divided into sulfide reductive alterations, latent reductive alterations (also called sulfide-free reductive alterations) and oil gas reductive alterations 3.

The sedimentary rock color is mainly controlled by the valence state and content of iron and the existence form, the rock oxidation-reduction property can be evaluated by the rock color and the content of the valence iron, but the color of the core just taken out from the core tube is greatly different from the color of the core after dehydration because the surface of ferrous mineral in the rock is easily oxidized when the core is exposed in the air, such as: pyrite and iron dolomite are covered with a layer of tawny iron hydroxide, molybdenum sulfide is covered with a layer of blue film-shaped blue molybdenum ore, copper sulfide is covered with verdigris and the like, and analysis data cannot accurately reflect the real rock environment.

Disclosure of Invention

The invention aims to provide an environmental index method for the occurrence of the change after the rock of a divided land-leaching sandstone-type uranium ore, which aims at the rocks of a uranium finding target layer, particularly ore-containing water-containing sandstone, which are adopted by drilling, solves the research, judgment and division of the zonation of the change after the rock of the land-leaching sandstone-type uranium ore, and analyzes enrichment factors of uranium content and uranium by combining quantitative gamma logging data, thereby achieving the purpose of accurately capturing the occurrence part of the uranium ore.

The technical scheme of the invention is as follows: an environmental index method for the rock after-alteration of a divided land-leaching sandstone-type uranium ore is characterized by comprising the following steps of: the method specifically comprises the following steps:

step 1, setting a rock environment index sample

Reasonably laying rock environment index samples according to the properties, stages and target tasks of the in-situ leaching sandstone uranium ore belt drilling evaluation or exploration project, the geological working status, the geological background and the mineralization condition, drawing a sampling design drawing, and explaining a sampling method, requirements and an executed rule;

step 2, field sampling is carried out

Step 3, carrying out experimental analysis on the sample

After sampling of the sample is completed, the sample is sent to a laboratory in time for rock specific potential determination, low-valence sulfur analysis and organic carbon analysis;

step 4, analyzing, sorting and utilizing experimental data

Classifying and counting data reported by sample analysis, quantifying a rock primary environment index background value, comparing the change condition of rock secondary alteration environment index, judging the type and period of the secondary alteration, finding out a mutation part between the rock with the most intense ore-controlling secondary oxidation alteration and the primary non-altered reduction rock, analyzing reduction factors for enriching uranium deposit, dividing secondary oxidation alteration zones, and providing reliable data basis for delineating the front line of an oxidation zone.

The step 1 specifically comprises:

step 1.1, establishing a sampling sample design principle;

on the basis of collecting and sorting the previous samples, classified sampling of the same region (or section), the same layer, the same sand body, the same lithology, the same color and the same environment is realized according to the rock after-corrosion change and ore finding conditions;

step 1.2, determining a sampling object;

the main object of definite sampling is to find a uranium target layer, the key point of the target layer is a sand body, the key point of the sand body is the anagenetic alteration sandstone, and the key point of the anagenetic alteration sandstone is the ore-bearing sandstone of a mutation part;

step 1.3, obtaining background data of a native rock environmental index sample of a uranium finding target layer;

step 1.4, determining sampling key points and determining a sampling mode;

step 1.5, select appropriate weight of sample for subsequent chemical analysis

Taking a rock core sample with the weight of more than 300g, and simultaneously analyzing or selectively analyzing the specific potential delta Eh and the low-valent sulfur S of the rock according to the geochemical type of the rock^2-And organic carbon Cy.

The step 2 of field sampling specifically comprises the following steps:

2.1, selecting a sampling tool;

step 2.2, sampling a sample;

2.2.1, sampling samples after drilling is finished;

after drilling, the core is taken out from the core box and put on the spread canvas, the sampling position and the sample length are taken by tape measure by using a core splitting or block picking sampling mode, the mud skin is removed by a scraper, the core is split by a geological hammer or a manual core splitter as appropriate, half of the core is packed into a plastic bag for sealing, and the other half is put back to the core box.

And 2.2.2, selecting a sample with proper weight, and labeling the sample.

When the sample experiment analysis is carried out in the step 3, the sample is subjected to sample crushing analysis, the rock and ore sample is generally crushed to 0.25mm, the same sample is divided into two samples with the same primary sample and the secondary sample, the primary sample is analyzed, the secondary sample is retained, and rock specific potential determination, low-valence sulfur analysis and organic carbon analysis are carried out;

the specific rock potential measuring method comprises the following specific steps:

step 3.1, specific potential measurement is carried out on the sample

Step 3.1.1 preparation of Potassium permanganate solution

Preparing a potassium permanganate solution according to the proportion of 1L of distilled water, 10ml of 10% potassium hydroxide solution and 5g of potassium permanganate, and standing for 7-10 days;

step 3.1.2, measuring the specific potential △ Eh of the rock;

putting 10g of crushed sample into a beaker A, adding 100ml of prepared potassium permanganate solution, directly adding 100ml of prepared potassium permanganate solution into another empty beaker B, uniformly stirring, respectively measuring Eh samples and Eh empty values of the solutions in the two beakers every 1, 3, 5, 10 and 24 hours, reading 3-5 data each time, taking the average value as the result until the result is stable, and obtaining the rock specific potential △ Eh ═ Eh_{Sample (A)}－Eh_{Air conditioner}Wherein, Eh_{Sample (A)}Eh value determined for a sample beaker; eh_{Air conditioner}Eh values determined for a no-sample beaker.

The step 1.3 of obtaining background data of the environmental index sample of the native rock of the uranium finding target layer comprises the following steps:

in each region or section, the geochemical types of the rock colors of primary rocks of a uranium target layer and secondary altered rocks are found out firstly, and then, corresponding samples are designed pertinently according to different types aiming at meeting the requirement of background value analysis, and the samples are designed comprehensively for drilling holes on a main section so as to facilitate contrastive analysis and consider other auxiliary sections and drilling holes with special geological phenomena.

The step 1.4 is to determine the sampling emphasis and the sampling mode as follows:

after the background data of the primary rock environment index sample of the uranium finding target layer is mastered, sampling is mainly put on the metaplasia rock, and the sampling is respectively carried out according to the metaplasia strength, the type and the zonation superimposed on the sand body of the uranium finding target layer, the mineralization position, the type, the grade and the like; the core of the ore section can be used as an environmental index sample in the uranium radium basic analysis sample as appropriate, and sampling is carried out in a split core mode; the post-alteration core was sampled in a block picking fashion.

The step 2.2.2 selects a sample with a proper weight, and the specific steps for labeling the sample are as follows:

weighing the weight of the sample by using an electronic scale, measuring the strength of the sample by using an β + gamma recorder, filling the sample into a label, wherein the sample cannot be mixed with rocks of different rock colors and geochemical types, and the characteristic minerals such as carbon dust, pyrite and the like seen by naked eyes and special geological phenomena need to be described and recorded in the label, perfecting the lithology, numbering and analysis item label contents of the sample in duplicate, wherein one part is reserved, the other part is put into a cloth sample bag together with the sample in the plastic bag, and the sample number is clearly written on the cloth sample bag by using a marker pen after the sample is sealed.

The sampling tool selected in the step 2.1 comprises canvas, a measuring tape, a scraper, a geological hammer, a manual core splitting device, a label, a plastic bag, an electronic scale, an β + gamma recorder, a cloth sample bag, a marker pen and the like.

In the step 2.2.1, the sample sampled after the drilling is finished must be cleared of the mud skin of the core, and the core impregnated with mud must not be taken absolutely.

The low-valent sulfur S is carried out in the step 3^2-The specific steps of analysis and organic carbon Cy analysis were:

step 3.2, carrying out low-valence sulfur analysis on the sample

Low sulfur S of the sample^2-The sulfur-containing material is characterized by comprising (1) total sulfur- (natural sulfur + sulfate sulfur), wherein the total sulfur is obtained by gravimetric analysis, and the natural sulfur and the sulfate sulfur are obtained by combustion analysis;

step 3.3, carrying out organic carbon analysis on the sample

Organic carbon Cy ═ total carbon C of sample_{General assembly}Inorganic carbon C_{Is free of}And can be obtained by non-aqueous titration analysis.

The invention has the following remarkable effects: the environmental index method for the after-corrosion change of the divided land-leaching sandstone type uranium ore rock selects the rock specific potential delta Eh and the low-valence sulfur S which are less influenced by air^2-The method can accurately judge the geochemical environment of the rock by combining and judging 3 rock environment index analysis data such as organic carbon Cy and the like, determine the strength of the after-growth alteration of the rock, realize the research, judgment and division of the zonation of the after-growth alteration zone of the rock of the ground dunite type uranium ore, and analyze enrichment factors of uranium-bearing property and uranium by combining quantitative gamma logging data, so as to accurately capture the occurrence part of the uranium ore, and has the characteristics of rapidness, accuracy, convenience and easiness.

Detailed Description

An environmental index method for the occurrence of rock anaplasia of a divided placer-leaching type uranium ore specifically comprises the following steps:

step 1, setting a rock environment index sample

Reasonably laying rock environment index samples according to the properties, stages and target tasks of the in-situ leaching sandstone uranium ore belt drilling evaluation or exploration project, the geological working status, the geological background and the mineralization condition, drawing a sampling design drawing, and explaining a sampling method, requirements and an executed rule;

step 1.1, establishing a design principle of a sampling sample

On the basis of collecting and sorting the conventional samples, reasonably designing rock environment index samples according to the after-corrosion change and ore-finding conditions of the rock; in order to truly reflect the geochemical environment of the rock and accurately determine the oxidation-reduction degree of the rock, the uniformity and the representativeness of samples must be ensured, classified sampling of the same region (or region), the same layer, the same sand body, the same lithology, the same color and the same environment is realized, the quantity of various samples is moderate, and the requirement of statistics is met as a bottom line;

step 1.2, determining a sampling object;

the main object of definite sampling is to find a uranium target layer, the key point of the target layer is a sand body, the key point of the sand body is the anagenetic alteration sandstone, and the key point of the anagenetic alteration sandstone is the ore-bearing sandstone of a mutation part;

step 1.3, obtaining background data of environmental index samples of native rocks of uranium finding target layer

In each area (or section), firstly, the geochemical types of the rock colors of native rocks of a uranium target layer and rock colors of post-alteration rocks are found out, then corresponding samples are designed in a targeted manner according to different types and aiming at meeting the requirement of background value analysis, and drilling holes in a main section are designed comprehensively so as to facilitate comparative analysis and consider other auxiliary sections and drilling holes with special geological phenomena;

step 1.4, determining sampling emphasis and determining sampling mode

After the background data of the primary rock environment index sample of the uranium finding target layer is mastered, sampling is mainly put on the metaplasia rock, and the sampling is respectively carried out according to the metaplasia strength, the type and the zonation superimposed on the sand body of the uranium finding target layer, the mineralization position, the type, the grade and the like; the core of the ore section can be used as a rock environment index sample in a uranium radium basic analysis sample as appropriate, and sampling is carried out in a split core mode; sampling the subsequent alteration rock core in a block picking mode;

step 1.5, select appropriate weight of sample for subsequent chemical analysis

Taking a rock core sample with the weight of more than 300g, and simultaneously analyzing or selectively analyzing the specific potential delta Eh and the low-valent sulfur S of the rock according to the geochemical type of the rock color^2-And organic carbon Cy;

step 2, field sampling is carried out

Step 2.1, selecting a sampling tool

Selecting sampling tools comprising canvas, a measuring tape, a scraper, a geological hammer, a manual core splitting device, a label, a plastic bag, an electronic scale, an β + gamma recorder, a cloth sample bag, a marker pen and the like;

step 2.2, sample taking

Step 2.2.1, sample taking after drilling completion

After drilling, taking out the sampled rock core from the core box, placing the rock core on spread canvas, taking a sampling position and a sampling length by a tape measure by using a core splitting or block picking sampling mode, removing mud skin by using a scraper, splitting by using a geological hammer or a manual core splitter as appropriate, filling half of the core into a plastic bag for sealing, and placing the other half back to the core box; wherein, the sampled sample must remove the mud skin of the core, and the core dipped by mud can not be adopted;

step 2.2.2, selecting samples with proper weight and marking the samples

Weighing the weight of the sample by using an electronic scale, measuring the strength of the sample by using an β + gamma recorder, filling the sample into a label, wherein the sample cannot be mixed with rocks of different rock colors and geochemical types, and the characteristic minerals such as carbon dust, pyrite and the like seen by naked eyes and special geological phenomena need to be described and recorded in the label, so that the lithology, numbering and label content of analysis items of the sample are perfected, one part is reserved, one part is put into a cloth sample bag together with the sample in the plastic bag, and the sample number is clearly written on the cloth sample bag by using a marker pen after the sample is sealed;

step 3, carrying out experimental analysis on the sample

After the sample is sampled, the sample is sent to a laboratory for analysis in time so as to reduce the time of the sample exposed in the air as much as possible, after the sample is received by the laboratory, the rock and ore sample is immediately crushed to phi 0.25mm, the same sample is divided into two samples with the same positive and negative, the positive sample is analyzed, the negative sample is retained, the rock specific potential △ Eh determination and the low-price sulfur S are carried out^2-Analysis and organic carbon Cy analysis;

step 3.1, specific potential △ Eh determination is carried out on the sample

Step 3.1.1 preparation of Potassium permanganate solution

Preparing a potassium permanganate solution according to the proportion of 1L of distilled water, 10ml of 10% potassium hydroxide solution and 5g of potassium permanganate, and standing for 7-10 days until the solution is stable;

step 3.1.2, measuring the specific potential △ Eh of the rock;

putting 10g of crushed sample into a beaker A, adding 100ml of prepared potassium permanganate solution, directly adding 100ml of prepared potassium permanganate solution into another empty beaker B, uniformly stirring, respectively measuring Eh samples and Eh empty values of the solutions in the two beakers every 1, 3, 5, 10 and 24 hours, reading 3-5 data each time, taking the average value as the result until the result is stable, and obtaining the rock specific potential △ Eh ═ Eh_{Sample (A)}－Eh_{Air conditioner}Wherein, Eh_{Sample (A)}Eh value determined for a sample beaker; eh_{Air conditioner}Eh value determined for a no-sample beaker;

step 3.2, carrying out low-valent sulfur S on the sample^2-Analysis of

Low sulfur S of the sample^2-The sulfur-containing material is characterized by comprising (1) total sulfur- (natural sulfur + sulfate sulfur), wherein the total sulfur is obtained by gravimetric analysis, and the natural sulfur and the sulfate sulfur are obtained by combustion analysis;

step 3.3, organic carbon Cy analysis of the sample

Organic carbon Cy ═ total carbon C of sample_{General assembly}Inorganic carbon C_{Is free of}Can be obtained by non-aqueous titration analysis;

step 4, analyzing, sorting and utilizing laboratory test analysis data

After receiving a test analysis report given by a laboratory, carrying out classified statistics on data, quantifying a rock primary environment index background value, comparing the change condition of rock secondary alteration environment indexes, judging the type and the period of the secondary alteration, finding out a mutation part between the rock with the original non-altered reduction and the rock with strongest ore-controlling secondary oxidation alteration, analyzing reduction factors for enriching uranium precipitates, carrying out secondary oxidation alteration zoning and division, and providing a reliable data basis for delineating the front line of an oxidation zone.