CN111650198A - Method for detecting black impurities in light calcium carbonate - Google Patents
Method for detecting black impurities in light calcium carbonate Download PDFInfo
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- CN111650198A CN111650198A CN202010502473.7A CN202010502473A CN111650198A CN 111650198 A CN111650198 A CN 111650198A CN 202010502473 A CN202010502473 A CN 202010502473A CN 111650198 A CN111650198 A CN 111650198A
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- calcium carbonate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
Abstract
The invention discloses a method for detecting black impurities in light calcium carbonate, which comprises the following steps: processing a sample, grinding the sample, uniformly spreading a calcium carbonate powder sample on a glass plate, placing the glass plate under a microscope, adjusting the microscope to clearly observe a calcium carbonate powder sample, taking 5 images at different positions by an image taking software, removing impurities from 5 images by using a measuring software, and determining the impurity grade by using a sample grade determination table, so as to obtain the impurity grade of the sample, finally guiding production and reasonably controlling calcium carbonate impurities; the invention utilizes the microscope observation principle to carry out sampling, observation, image capture, analysis and qualitative analysis on the light calcium carbonate sample, and the qualified basic value is worked out, and the calcium carbonate impurity index can be reasonably controlled after the qualified basic value exceeds the basic value and is processed according to unqualified products, so the detection accuracy is high, and the improvement of the quality of plastic products is facilitated.
Description
Technical Field
The invention relates to the technical field of calcium carbonate production, in particular to a method for detecting black impurities in light calcium carbonate.
Background
At present, a detection method of visible black impurities in common light calcium carbonate is not determined in standard HG/T2226-2010 industrial precipitated calcium carbonate and GB/T19281-2014 calcium carbonate analysis methods, and the existing light calcium carbonate black impurity detection method for production comprises the following steps: weighing about 10g of sample, mixing the sample into paste by using ethanol, comparing with the number of small black spots of a reference sample (the same amount), if the accurate judgment cannot be carried out, weighing about 10g of sample, transferring the sample into an iodine measuring bottle, adding ethanol to prepare suspension, observing the bottom of the bottle, and if the number of the small black spots of the sample is less than the number of the small black spots of the reference sample, considering that the small black spots are normal, otherwise, carrying out the rechecking. The method has the defects that: the rough judgment is carried out only by manually observing the size of the small black spots at the bottom of the test bottle and the approximate number of the small black spots, the rigidness is lacked, the detection is not accurate, the apparent quality of the plastic processing product is determined to a certain extent by the number of the small black spots (black impurities), and the quality of the plastic product is easily influenced by the detection inaccuracy.
Disclosure of Invention
The invention mainly aims to provide a method for detecting black impurities in light calcium carbonate, which can effectively solve the problems that the existing method for detecting black impurities in light calcium carbonate in the background art is lack of rigor, inaccurate in detection and influences the quality of plastic products.
In order to achieve the purpose, the invention adopts the technical scheme that: a detection method of black impurities in light calcium carbonate comprises the following steps:
1) sample treatment: cleaning and drying the surface of a calcium carbonate sample, and removing large-particle impurities visible on the surface;
2) grinding a sample: putting the cleaned and dried calcium carbonate sample into a grinding machine for grinding into powder;
3) sampling: the calcium carbonate powder in step 2 was uniformly spread on a clean clear glass plate with a thickness of 10mm, specified 75 × 25mm, as a test pallet.
4) Imaging: and (4) placing the glass plate obtained in the step (3) under a microscope, adjusting the microscope to clearly observe the calcium carbonate powder sample, and respectively taking 5 images at different positions by using image taking software.
5) Impurity removal judgment: and (3) removing impurities from the 5 samples of photos by using determination software, and determining the impurity grade of the photos after impurity removal by using a sample grade determination table, so that the impurity grade of the samples is obtained, the production is guided finally, and the calcium carbonate impurities are controlled reasonably.
Preferably, the powder ground in the step 2 is 1600-1800 mesh.
Preferably, the tiling thickness of the calcium carbonate powder in step 3 is not more than 0.02 mm.
Preferably, the tiling area of the calcium carbonate powder in the step 3 is not more than 100mm2。
Preferably, the microscope in the step 4 is a multiple of 100.
Preferably, in step 4, the imaging software is optro, and the imaging size is 2048 × 1536 × 10.
Preferably, the software for measuring in step 5 is carbon black dispersion measurement software.
Preferably, in the step 5, searching is performed after setting the size and the area of the software, and after determining the size and the quantity of the impurities, the grade is judged according to a grade table.
Compared with the prior art, the invention has the following beneficial effects: the invention utilizes the microscope observation principle to carry out sampling, observation, image capture, analysis and qualitative analysis on the light calcium carbonate sample, and the qualified basic value is worked out, and the calcium carbonate impurity index can be reasonably controlled after the qualified basic value exceeds the basic value and is processed according to unqualified products, so the detection accuracy is high, and the improvement of the quality of plastic products is facilitated.
Drawings
FIG. 1 is a table of sample grade determinations according to the present invention;
FIG. 2 is a picture before specimen photos are decontaminated according to the present invention;
FIG. 3 is a photograph of a sample according to the present invention after removing impurities.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
A detection method of black impurities in light calcium carbonate comprises the following steps:
1) sample treatment: cleaning and drying the surface of a calcium carbonate sample, and removing large-particle impurities visible on the surface;
2) grinding a sample: putting the cleaned and dried calcium carbonate sample into a grinding machine for grinding into powder;
3) sampling: the calcium carbonate powder in step 2 was uniformly spread on a clean clear glass plate with a thickness of 10mm, specified 75 × 25mm, as a test pallet.
4) Imaging: and (4) placing the glass plate obtained in the step (3) under a microscope, adjusting the microscope to clearly observe the calcium carbonate powder sample, and respectively taking 5 images at different positions by using image taking software.
5) Impurity removal judgment: as shown in fig. 1-3, 5 samples of photos are subjected to impurity removal by using determination software, and the impurity grade of the photos after impurity removal is determined by using a sample grade determination table, so that the impurity grade of the samples is obtained, the production is guided finally, and the calcium carbonate impurities are controlled reasonably.
In this embodiment, the powder ground in step 2 is 1600-1800 mesh.
In this embodiment, the tiling thickness of the calcium carbonate powder in step 3 is not more than 0.02 mm.
In this embodiment, the tiling area of the calcium carbonate powder in step 3 is not more than 100mm 2.
In this embodiment, the microscope in step 4 is a multiple of 100.
In this embodiment, the imaging software in step 4 is oppro, and the imaging size is 2048 × 1536 × 10.
In this example, the software for measurement in step 5 is carbon black dispersion measurement software.
In this embodiment, in the step 5, searching is performed after setting the size and the area of the software, and after determining the size and the number of the impurities, the grade is judged according to the grade table.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (8)
1. A method for detecting black impurities in light calcium carbonate is characterized by comprising the following steps: the method comprises the following steps:
1) sample treatment: cleaning and drying the surface of a calcium carbonate sample, and removing large-particle impurities visible on the surface;
2) grinding a sample: putting the cleaned and dried calcium carbonate sample into a grinding machine for grinding into powder;
3) sampling: the calcium carbonate powder in step 2 was uniformly spread on a clean clear glass plate with a thickness of 10mm, specified 75 × 25mm, as a test pallet.
4) Imaging: and (4) placing the glass plate obtained in the step (3) under a microscope, adjusting the microscope to clearly observe the calcium carbonate powder sample, and respectively taking 5 images at different positions by using image taking software.
5) Impurity removal judgment: and (3) removing impurities from the 5 samples of photos by using determination software, and determining the impurity grade of the photos after impurity removal by using a sample grade determination table, so that the impurity grade of the samples is obtained, the production is guided finally, and the calcium carbonate impurities are controlled reasonably.
2. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: the powder ground in the step 2 is 1600-1800 meshes.
3. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: the tiling thickness of the calcium carbonate powder in the step 3 is not more than 0.02 mm.
4. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: the tiling area of the calcium carbonate powder in the step 3 is not more than 100mm 2.
5. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: the microscope in the step 4 is a multiple of 100.
6. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: in step 4, the imaging software is OPTPRO, and the imaging size is 2048 × 1536 × 10.
7. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: the software for measuring in the step 5 is carbon black dispersion measuring software.
8. The method for detecting the black impurities in light calcium carbonate according to claim 1, wherein the method comprises the following steps: and 5, searching after setting according to the size and the area of the software, determining the size and the quantity of the impurities, and judging the grade according to a grade table.
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| CN202010502473.7A CN111650198A (en) | 2020-06-03 | 2020-06-03 | Method for detecting black impurities in light calcium carbonate |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4976540A (en) * | 1988-05-27 | 1990-12-11 | Shin-Etsu Chemical Co., Ltd. | Method for detecting colored foreign particles in light-colored powder and system therefor |
| WO1992008965A1 (en) * | 1990-11-13 | 1992-05-29 | Powergen Plc | Method and apparatus for measurement of carbon in ash |
| TW240290B (en) * | 1992-12-28 | 1995-02-11 | Shinetsu Kagaku Gogyo Kk | |
| CN101813637A (en) * | 2008-12-26 | 2010-08-25 | 日本超精石英株式会社 | Method and apparatus for detecting colored foreign particles in quartz powder material |
| CN106323991A (en) * | 2015-06-29 | 2017-01-11 | 鞍钢股份有限公司 | Method for measuring cleanliness of IF steel casting blank |
| CN106706504A (en) * | 2017-03-14 | 2017-05-24 | 张姿 | Optical analysis method for micro-nano granular powder impurities |
| CN106770365A (en) * | 2017-03-14 | 2017-05-31 | 黄廷磊 | Powder sample impurity analysis instrument |
| CN109283178A (en) * | 2018-11-19 | 2019-01-29 | 中国科学院南京地理与湖泊研究所 | A kind of breeze automatic identification statistical grade method |
-
2020
- 2020-06-03 CN CN202010502473.7A patent/CN111650198A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4976540A (en) * | 1988-05-27 | 1990-12-11 | Shin-Etsu Chemical Co., Ltd. | Method for detecting colored foreign particles in light-colored powder and system therefor |
| WO1992008965A1 (en) * | 1990-11-13 | 1992-05-29 | Powergen Plc | Method and apparatus for measurement of carbon in ash |
| TW240290B (en) * | 1992-12-28 | 1995-02-11 | Shinetsu Kagaku Gogyo Kk | |
| CN101813637A (en) * | 2008-12-26 | 2010-08-25 | 日本超精石英株式会社 | Method and apparatus for detecting colored foreign particles in quartz powder material |
| CN106323991A (en) * | 2015-06-29 | 2017-01-11 | 鞍钢股份有限公司 | Method for measuring cleanliness of IF steel casting blank |
| CN106706504A (en) * | 2017-03-14 | 2017-05-24 | 张姿 | Optical analysis method for micro-nano granular powder impurities |
| CN106770365A (en) * | 2017-03-14 | 2017-05-31 | 黄廷磊 | Powder sample impurity analysis instrument |
| CN109283178A (en) * | 2018-11-19 | 2019-01-29 | 中国科学院南京地理与湖泊研究所 | A kind of breeze automatic identification statistical grade method |
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