Method for rapidly distinguishing sedimentary environment of coal rock by using ash content and total sulfur content

Abstract

The application provides a method for rapidly distinguishing coal rock sedimentary environment by using ash yield and total sulfur content, comprising the following steps: drawing an ash yield-total sulfur content relationship diagram of coal rock; obtaining ash yield data and total sulfur content data of a coal rock sample to be measured; and explaining the sedimentary environment of the coal rock sample to be measured according to the position area of the ash yield data and the total sulfur content data of the coal rock sample to be measured on the ash yield-total sulfur content relationship diagram. The application distinguishes the sedimentary environment of the coal rock sample to be measured according to the position area of the ash yield data and the total sulfur content data of the coal rock sample to be measured on the ash yield-total sulfur content relationship diagram. The distinguishing method of the application is simple in steps, can clearly and intuitively make an efficient judgment on whether the peat bog type in the coal rock sedimentary environment is affected by marine transgression, the test data is convenient to obtain, is not affected by subjective factors, and the distinguishing result is relatively accurate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coal geological exploration, and more particularly relates to a method for rapidly identifying the sedimentary environment of coal rock by using ash content and total sulfur content. BACKGROUND

[0002] The analysis of the sedimentary environment of coal is to analyze the development environment of ancient coal-forming peat bogs. In the coal seam, the coal body shape, extension direction, genetic type of coal, coal rock type, and the changes of ash content and sulfur content are closely related to the development range of coal-forming peat bogs, the depth of overlying water, the connection with the surrounding water system, and the medium acidity, oxidation-reduction potential and other factors. The study of the sedimentary environment of coal rock can restore the material conditions and sedimentary environment of coal formation, analyze the distribution rule and reason of different coal rock types and minerals in coal, delineate the distribution range of high-quality coal and use it for coal seam correlation and coal quality distribution prediction.

[0003] At present, in the analysis of the sedimentary environment of coal rock, the main method for identifying the type of peat bog is to introduce quantitative genetic parameters such as gelation index GI, structure preservation index TPI, vegetation index VI, groundwater influence index GWI, mirror inertia ratio index V / I, mobility index MI, and T-D-F diagram based on the quantitative statistical results of macerals. This method can explain the type of peat bog of coal rock, but if a more accurate identification result is to be obtained, the thickness, continuity, mineral characteristics, organic and inorganic geochemical characteristics of the coal seam and other factors still need to be considered comprehensively. The data acquisition process is relatively cumbersome, and the quantitative statistical results of macerals are greatly affected by human factors. SUMMARY

[0004] The purpose of the present application is to provide a method for rapidly identifying the sedimentary environment of coal rock by using ash content and total sulfur content, so as to solve the technical problems of the prior art that the analysis process of the sedimentary environment of coal rock is relatively cumbersome and the analysis result is not accurate.

[0005] To achieve the above-mentioned purpose, the present application provides a method for rapidly identifying the sedimentary environment of coal rock by using ash content and total sulfur content, characterized in that it comprises the following steps:

[0006] drawing an ash yield-total sulfur content relationship diagram of coal rock;

[0007] obtaining ash yield data and total sulfur content data of a coal rock sample to be tested;

[0008] explaining the sedimentary environment of the coal rock sample to be tested according to the position area of the ash yield data and total sulfur content data of the coal rock sample to be tested on the ash yield-total sulfur content relationship diagram.

[0009] Further, the ash yield-full sulfur content relationship diagram includes the following four regions: a peat bog area affected by marine transgression, a high peat bog area, a medium peat bog area, and a low peat bog area.

[0010] Further, in the ash yield-full sulfur content relationship diagram, the area with full sulfur content > 1.5% is the peat bog area affected by marine transgression; the area with ash yield of 0-6% is the high peat bog area, the area with ash yield of 6-12% is the medium peat bog area, and the area with ash yield > 12% is the low peat bog area.

[0011] Further, the coal rock sample to be tested is a particle sample with a particle size of less than 0.2 mm.

[0012] Further, the coal rock sample to be tested is subjected to drying treatment before testing.

[0013] Further, the drying treatment conditions are: drying at 105-110℃ for 2-6h.

[0014] Further, the ash yield data acquisition includes the following steps:

[0015] Weigh the coal rock sample to be tested with a mass of m1 g and place it in a muffle furnace;

[0016] The muffle furnace is heated to 500℃ within 30 minutes and kept at 500℃ for 30 minutes;

[0017] Then continue to heat to 815℃, and burn for 1 hour, and after cooling, weigh and record as m2 g, and the ash yield data is A = m2 / m1 x 100%.

[0018] Further, m1 = 1±0.1g.

[0019] Further, the full sulfur content data is obtained by using a sulfur determinator to determine the full sulfur content.

[0020] Further, 50±5mg of the coal rock sample to be tested is weighed, and the full sulfur content is determined using the sulfur determinator.

[0021] Compared with the prior art, the present application has the following technical effects:

[0022] The method for rapidly distinguishing the sedimentary environment of coal rock by using ash yield and total sulfur content provided in the application distinguishes the sedimentary environment of the coal rock sample to be tested according to the position area of the coal rock sample to be tested on the ash yield-total sulfur content relation diagram, by drawing the ash yield-total sulfur content relation diagram of the coal rock and according to the position area of the ash yield data and the total sulfur content data of the coal rock sample to be tested on the ash yield-total sulfur content relation diagram. The distinguishing method provided in the application is simple in steps, can clearly and intuitively make an efficient judgment on the type of the coal-forming peat bog in the sedimentary environment of the coal rock and whether the peat bog is affected by marine transgression, the test data is easy to obtain and is not affected by subjective factors, and the distinguishing result is relatively accurate. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 The ash yield-total sulfur content relation diagram of the coal rock provided in the embodiments of the application;

[0025] Figure 2 The position area diagram of the coal in the Yunnan Puyang Basin in the ash yield-total sulfur content relation diagram provided in the embodiments of the application. DETAILED DESCRIPTION

[0026] In order to make the technical problems to be solved by the application, the technical solutions and the beneficial effects more clearly, the following will further describe the application in combination with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0027] It should be understood that in various embodiments of the application, the size of the serial number of the above processes does not mean the order of execution, and part or all steps can be executed in parallel or in sequence, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the application.

[0028] The terms used in the embodiments of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application. The singular forms "a", "said" and "the" used in the embodiments of the application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0029] The weight of the related components mentioned in the embodiment specification of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of each component. Therefore, as long as the content of the related components in the embodiment specification of the present application is enlarged or reduced in proportion, it is within the scope disclosed in the embodiment specification of the present application. Specifically, the mass mentioned in the embodiment specification of the present application can be μg, mg, g, kg, and other mass units commonly known in the chemical industry.

[0030] The embodiment of the present application provides a method for quickly distinguishing the sedimentary environment of coal rock by using ash yield and total sulfur content, characterized in that it comprises the following steps:

[0031] (1) Draw an ash yield-total sulfur content relationship diagram of coal rock;

[0032] (2) Obtain the ash yield data and total sulfur content data of the coal rock sample to be tested;

[0033] (3) According to the position area of the ash yield data and total sulfur content data of the coal rock sample to be tested on the ash yield-total sulfur content relationship diagram drawn in step (1), the sedimentary environment of the coal rock sample to be tested is explained.

[0034] In the embodiment of the present application, the ash yield-total sulfur content relationship diagram drawn in the above step (1) includes the following four areas: a peat bog area affected by marine transgression, a high peat bog area, a medium peat bog area, and a low peat bog area. Specifically, in the ash yield-total sulfur content relationship diagram, the area with total sulfur content > 1.5% is the peat bog area affected by marine transgression; the area with ash yield of 0-6% is the high peat bog area, the area with ash yield of 6-12% is the medium peat bog area, and the area with ash yield > 12% is the low peat bog area, see FIG. 1. Figure 1 .

[0035] The division of the area in the ash yield-full sulfur content relationship diagram in the embodiments of the present application is based on the following principle: the ash of coal refers to the residue obtained after complete combustion of coal under specified conditions, which is mainly converted from the mineral matter in coal and can reflect the content of mineral matter in coal. The mineral matter in coal mainly comes from the water supply of the peat bog, and thus the ash content of coal can reflect the type of peat bog. The low-position peat bog is supplied with abundant water from surface water and underground water, and the dissolved mineral nutrients in the water are abundant, so the formed coal has a high ash yield (> 12%); the high-position peat bog is mainly supplied with atmospheric precipitation, and the formed peat has a low ash content (< 6%) due to the insufficient water supply and the lack of mineral nutrients in the water. The sulfur in coal mainly comes from two aspects: one is the sulfur preserved in the original coal-forming plants, and the content of this part of sulfur is low (< 1.5%); the other is the sulfate in the invading seawater in the peat bog. Therefore, the content of sulfur in coal can reflect whether the peat bog is affected by seawater. The sulfur in low-sulfur coal generally comes from the original plants, and the sulfur in medium-sulfur coal and high-sulfur coal comes from the original plants and the sulfate in the invading seawater in the peat bog.

[0036] In the above step (2), the coal rock sample to be tested needs to be dried before the ash yield data and the full sulfur content data are tested. The drying treatment conditions can be selected as follows: drying at 105-110°C for 2-6h. The coal rock sample to be tested in the embodiments of the present application is a granular sample with a particle size of less than 0.2mm.

[0037] In the embodiments of the present application, the acquisition of the ash yield data includes the following steps: weighing a coal rock sample to be tested with a mass of m1 g and placing it in a muffle furnace; m1 = 1±0.1g; allowing the muffle furnace to be heated to 500°C within 30 minutes and kept at 500°C for 30 minutes; then continuing to heat to 815°C, burning for 1 hour, and weighing after cooling as m2 g, and the ash yield data is A = m2 / m1 x 100%.

[0038] In the embodiments of the present application, the acquisition of the full sulfur content data uses a sulfur determinator to determine the full sulfur content. Specifically, 50±5mg of the coal rock sample to be tested is weighed, burned to generate SO2 at 1350°C, and the full sulfur content is determined using a sulfur determinator.

[0039] The following will illustrate one method for quickly distinguishing the sedimentary environment of coal rock by using ash and full sulfur content according to an embodiment of the present application through a specific embodiment.

[0040] Embodiment

[0041] The embodiments of the present application provide a method for quickly distinguishing the sedimentary environment of coal rock in the Puyang Basin in Yunnan by using ash and full sulfur content, which includes the following steps:

[0042] S1, prepare the coal rock particle sample to be tested, and dry the coal rock sample. The preparation method of the coal rock particle sample to be tested is as follows: 34 coal rock samples are taken from the Puyang coal mine in Yunnan, and the coal samples are taken every 1 m, the coal samples are prepared into particle samples with a particle size of less than 0.2 mm, and then placed in a vacuum drying box and dried at 110 DEG C for 2 h.

[0043] S2, weigh 1±0.1 g of coal rock sample as m1, and make the furnace temperature rise to 500 DEG C in 30 minutes in a muffle furnace, and keep at 500 DEG C for 30 minutes, then continue to rise to 815 DEG C, and burn for 1 hour; cool and weigh as m2, and calculate the ash yield of the coal sample by the formula A=m2 / m1x100%.

[0044] S3, weigh 50±5 mg of coal rock sample and burn to generate SO2 at 1350 DEG C, and use a sulfur determination instrument to determine the total sulfur content.

[0045] S4, draw a coal rock ash yield-total sulfur content relationship diagram, the vertical coordinate is the total sulfur content, the area with total sulfur content>1.5% represents the peat bog affected by marine transgression; the horizontal coordinate is the ash yield, the area with ash yield of 0-6% is high peat bog, the area with ash yield of 6-12% is medium peat bog, and the area with ash yield>12% is low peat bog. According to the ash and total sulfur content data of the coal rock particle sample to be tested measured in step S3, a scatter diagram is made, see FIG. 1, and according to the area in the diagram, it can be judged that the coal in the Puyang basin in Yunnan is formed in low peat bog and does not experience marine water intrusion. Figure 2

[0046] The method for quickly distinguishing the sedimentary environment of coal rock according to the ash and total sulfur content in the embodiment of the application distinguishes the sedimentary environment of the coal rock sample to be tested according to the position area of the ash yield and total sulfur content data of the coal rock sample to be tested in the ash yield-total sulfur content relationship diagram. The distinguishing method in the embodiment of the application is simple in steps, and can clearly and intuitively make efficient judgment on the type of coal-forming peat bog in the sedimentary environment of the coal rock and whether the peat bog is affected by marine transgression. The test data is easy to obtain, is not affected by subjective factors, and the distinguishing result is relatively accurate.

[0047] The above embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it cannot be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the application, several modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.​

Claims

1. A method for quickly distinguishing sedimentary environment of coal rock by using ash content and total sulfur content, characterized in that, The method comprises the following steps: drawing an ash yield-full sulfur content relation graph of coal rock; obtaining ash yield data and full sulfur content data of a coal rock sample to be tested; interpreting the sedimentary environment of the coal rock sample to be tested according to the position area of the coal rock sample to be tested on the ash yield-full sulfur content relation graph; the ash yield-full sulfur content relation graph comprises the following four areas: a peat bog area affected by marine transgression, a high peat bog area, a medium peat bog area, and a low peat bog area; in the ash yield-full sulfur content relation graph, the area with full sulfur content > 1.5% is the peat bog area affected by marine transgression, the area with ash yield of 0-6% is the high peat bog area, the area with ash yield of 6-12% is the medium peat bog area, and the area with ash yield > 12% is the low peat bog area.

2. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 1, characterized in that, The coal rock sample to be tested is a granular sample with a particle size of less than 0.2 mm.

3. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 1, characterized in that, The coal rock sample to be tested is subjected to drying treatment before testing.

4. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 3, characterized in that, The drying treatment conditions are: drying at 105-110 ℃ for 2-6 h.

5. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 1, characterized in that, The ash yield data are obtained by the following steps: weighing the coal rock sample to be tested with a mass of m1 g and placing it in a muffle furnace; raising the temperature of the muffle furnace to 500 ℃ within 30 min and keeping it at 500 ℃ for 30 min; then continuously raising the temperature to 815 ℃, burning for 1 h, and weighing after cooling and recording as m2 g, wherein the ash yield data are A = m2 / m1 × 100%.

6. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 5, characterized in that, m1 = 1 ± 0.1 g.

7. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 1, characterized in that, The full sulfur content data are obtained by full sulfur content determination using a sulfur determinator.

8. The method for rapidly identifying the sedimentary environment of coal rock using ash content and total sulfur content according to claim 7, characterized in that, weighing the coal rock sample to be tested with a mass of 50 ± 5 mg, and using the sulfur determinator to determine the full sulfur content.

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