Method for detecting hydroxyl content in granite pegmatite raw ore

Abstract

The invention relates to a method for detecting the content of hydroxyl in granite pegmatite raw ore, which comprises the following steps: S1, cutting granite pegmatite into a plurality of slices with different thicknesses, and cleaning the surfaces of the slices; s2, sequentially grinding and polishing the granite pegmatite ore slices under different mesh numbers, and then cleaning and drying; and S3, carrying out infrared spectrum test on the granite pegmatite ore slice, and calculating the hydroxyl content. Therefore, the hydroxyl content in the granite pegmatite can be detected, the detection precision and efficiency are greatly improved, anhydrous magnesium sulfate is adopted as a grinding key component, and a segmented grinding process is combined, so that the method is more suitable for testing requirements of different types of granite pegmatite.

Description

Technical Field

[0001] The invention relates to the technical field of quartz ores, in particular to a method for detecting the hydroxyl content in granite pegmatite ore. Background Art

[0002] Granite pegmatite is a rock formed by magmatic activity or metamorphism, with special mineral composition and physical and chemical properties. In the fields of geology, mineralogy and materials science, granite pegmatite has attracted much attention due to its unique properties. Hydroxyl (-OH) is one of the important functional groups in granite pegmatite, and its content detection is of great significance for understanding the origin, physical and chemical properties and application potential of rocks.

[0003] Hydroxyl is widely present in granite pegmatites, mainly in the form of gas-liquid inclusions and hydroxyl groups on the surface of minerals. The presence of hydroxyl not only affects the mineral composition and crystal structure of the rock, but also directly affects its physical and chemical properties, such as hydrophilicity and stability. Therefore, accurate detection of hydroxyl content is of great significance for studying the genetic mechanism, mineral evolution process and potential applications of granite pegmatites.

[0004] With the continuous advancement of science and technology, the requirements for the detection accuracy and efficiency of hydroxyl content in granite pegmatite are becoming higher and higher. Traditional detection methods often have disadvantages such as complex operation, long time consumption, and large reagent consumption, which are difficult to meet the needs of modern scientific research and industrial applications. Therefore, the development of new, efficient and accurate hydroxyl content detection technology has become a current research hotspot. Summary of the invention

[0005] Carry out "Granite Pegmatite Slicing" as shown in the figure, cut the granite pegmatite into slices of various thicknesses, carry out "Granite Pegmatite Cleaning" as shown in the figure, and clean the surface of the slices to remove excess impurities;

[0006] The granite pegmatite thin slice is ground and polished in turn at different mesh sizes as shown in the figure, and the granite pegmatite thin slice is dried as shown in the figure, and then cleaned and dried after completion;

[0007] Carry out the "Hydroxy Content Detection" step as shown in the figure, perform infrared spectrum test on the granite pegmatite ore thin section, and calculate the hydroxyl content.

[0008] The samples are cut into ore slices of different thicknesses, with the preferred thickness being between 1 and 10 mm.

[0009] The samples were ground using a variety of sandpapers with different mesh sizes, with the preferred mesh size being between 200 and 2000 meshes; the grinding speed was between 150 and 1000 r / min; and finally diamond polishing fluid was used to polish the ore surface.

[0010] The sample ore needs to be placed in anhydrous magnesium sulfate powder for drying.

[0011] The sample drying temperature is above 80°C and the drying time is greater than 60 minutes.

[0012] The spectral curve of the test sample ore sample is in the range of 2.50-3.10μm.

[0013] The calculation formula of hydroxyl in sample ore sample is,

[0014] C=965*(AA 0 ) / dC is the hydroxyl content of the sample, in micrograms per gram (μg / g);

[0015] d is the thickness of the sample, in millimeters (mm);

[0016] A is the absorbance of the absorption peak at 2.73 μm;

[0017] A 0 is the absorbance of the baseline at 2.73 μm.

[0018] The invention provides a method for detecting the hydroxyl content in granite pegmatite ore.

[0019] In the prior art, the evaluation of quartz minerals or quartz sand adopts the method of crushing the minerals into quartz sand and then testing. This method has the disadvantages of complex operation, long time consumption, large reagent consumption and easy contamination of samples, resulting in large deviations in the test results. The present invention adopts the method of directly testing after preliminary slicing of the quartz ore, which significantly improves the accuracy and efficiency of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a flow chart of a method for detecting the hydroxyl content in granite pegmatite ore.

[0021] The sequence of steps in the flow chart is granite pegmatite slicing, granite pegmatite cleaning, granite pegmatite thin section grinding and polishing, granite pegmatite thin section drying and hydroxyl content detection. DETAILED DESCRIPTION

[0022] The method of cutting and cleaning the granite pegmatite ore specifically includes: using a wire cutting machine to cut the granite pegmatite ore into four thicknesses of 1 mm, 3 mm, 5 mm and 10 mm granite pegmatite slices; after the cutting is completed, the granite pegmatite slices are placed in an ultrasonic cleaning machine to clean the surface of the slices;

[0023] The grinding and polishing treatment of the cleaned granite pegmatite ore thin slice surface specifically includes:

[0024] Granite pegmatite ore slices of four thicknesses were glued to the grinding disc of the grinding and polishing machine with paraffin wax. The first grinding speed was 500r / min, the grinding time was 600s, and the grinding sandpaper used had a particle size of 240 mesh; the second grinding speed was 500r / min, the grinding time was 600s, and the grinding sandpaper used had a particle size of 400 mesh; the third grinding speed was 500r / min, the grinding time was 600s, and the grinding sandpaper used had a particle size of 800 mesh; the first grinding speed was 500r / min, the grinding time was 600s, and the grinding sandpaper used had a particle size of 1200 mesh; after the grinding was completed, the grinding disc was replaced with a polishing disc, and the ground granite pegmatite ore slice was glued to the polishing disc, the polishing number was 1, the polishing time was 600s, the polishing speed was 500r / min, and a diamond polishing liquid with a particle size of 8μm was used; after the grinding and polishing was completed, the surface was cleaned;

[0025] The drying process of the granite pegmatite ore slices specifically includes: placing the granite pegmatite ore slices in anhydrous magnesium sulfate powder and drying at 120°C for 240 minutes; after the drying is completed, the surface of the granite pegmatite ore slices is wiped clean with a dust-free cloth, and the four sides of the dust-free cloth should be wrapped inside when using it, and the edge of the dust-free cloth should not touch the surface of the wiped object; the dust-free cloth should be kept flat when using it, and it should not be rubbed. When moving and wiping, try to make the fibers of the step completely contact with the wiped surface, and make sure to wipe in the same direction, and do not wipe back and forth repeatedly;

[0026] The infrared spectrum test of granite pegmatite ore thin sections specifically includes:

[0027] 1. Test environment: During the test, the test environment temperature should be kept at 21℃±5℃ and the relative humidity should be kept at 20%RH~60%RH;

[0028] 2. Set the sample scan time to 22s and the background scan time to 22s;

[0029] 3. During the test, fix the granite pegmatite ore slice on the light barrier frame of the test light path, aligning its center with the center of the light barrier;

[0030] 4. The spectral curve of the test sample in the range of 2.50-3.10μm, atmosphere compensation and moisture compensation are required during spectrum processing;

[0031] 5. Measure the thickness of the sample, read the absorbance with infrared software and enter it into the following formula for calculation:

[0032] C=965*(AA 0 ) / d

[0033] Where:

[0034] C—hydroxyl content of the sample, in micrograms per gram (μg / g);

[0035] d—specimen thickness, in millimeters (mm);

[0036] A—Absorbance of the absorption peak at 2.73 μm;

[0037] A 0 —Absorbance of the baseline at 2.73 μm. Specific embodiment:

[0039] The thickness of sample 1 is d = 0.92 mm, and the software reads A = 0.034. 0 =0.023, and the hydroxyl content of sample 1 is calculated to be 11.54 μg / g.

[0040] The thickness of sample 2 is d = 1.36 mm, and the software reads A = 0.124. 0 =0.075, and the hydroxyl content of sample 1 is calculated to be 34.77 μg / g.

[0041] The thickness of sample 3 is d = 1.45 mm, and the software reads A = 0.027. 0 =0.018, and the hydroxyl content of sample 1 is calculated to be 5.99 μg / g.

[0042] The thickness of sample 4 is d = 1.96 mm, and the software reads A = 0.042. 0 =0.028, and the hydroxyl content of sample 1 is calculated to be 6.89 μg / g.

[0043] The thickness of sample 5 is d = 2.54 mm, and the software reads A = 0.034. 0 =0.021, and the hydroxyl content of sample 1 is calculated to be 4.94 μg / g.

Claims

1. A method for detecting the hydroxyl content in granite pegmatite ore, characterized in that: S1. Cutting the granite pegmatite into thin slices of various thicknesses and surface cleaning the thin slices; S2. Grinding and polishing the granite pegmatite ore slices in different mesh sizes in turn, and then cleaning and drying them after completion; S3. Perform infrared spectroscopy test on granite pegmatite ore thin sections and calculate the hydroxyl content.

2. As claimed in claim 1, characterized in that In step S1, the ore is cut into slices of different thicknesses, with the preferred thickness being between 1 and 10 mm.

3. As claimed in claim 1, characterized in that In step S2, a plurality of grinding sandpapers with different mesh sizes are used, and the preferred mesh size is between 200-2000 mesh; the grinding speed is between 150-1000 r / min; and finally, diamond polishing liquid is used to polish the surface of the ore.

4. As claimed in claim 1, characterized in that The ore drying in step S2 needs to be placed in anhydrous magnesium sulfate powder.

5. As claimed in claim 1, characterized in that In step S2, the drying temperature is above 80° C. and the drying time is greater than 60 min.

6. As claimed in claim 1, characterized in that The spectral curve of the ore sample tested in step S3 is within the range of 2.50-3.10 μm.

7. As claimed in claim 1, characterized in that The calculation formula of the hydroxyl group of the ore sample in step S3 is: C=965*(A-A0) / d C is the hydroxyl content of the sample, in micrograms per gram (μg / g); d is the thickness of the sample, in millimeters (mm); A is the absorbance of the absorption peak at 2.73 μm; A0 is the absorbance of the baseline at 2.73 μm.

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