CN111595908A - Method for detecting salt content of abrasive used for sand blasting steel surface - Google Patents
Method for detecting salt content of abrasive used for sand blasting steel surface Download PDFInfo
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- CN111595908A CN111595908A CN202010412260.5A CN202010412260A CN111595908A CN 111595908 A CN111595908 A CN 111595908A CN 202010412260 A CN202010412260 A CN 202010412260A CN 111595908 A CN111595908 A CN 111595908A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 14
- 239000010959 steel Substances 0.000 title claims abstract description 14
- 238000005488 sandblasting Methods 0.000 title claims abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 16
- 239000012266 salt solution Substances 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 29
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 12
- 239000012498 ultrapure water Substances 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 10
- 238000000605 extraction Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 239000003082 abrasive agent Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 3
- 239000012086 standard solution Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention relates to a method for detecting the salt content of an abrasive used for sand blasting steel surface, which comprises the steps of preparing a series of standard salt solutions with known concentrations, measuring the electric conductivity of the standard salt solutions, drawing a linear relation between the salt content and the electric conductivity, extracting the salt in the abrasive, measuring the electric conductivity of the abrasive, and calculating the salt content in the abrasive according to the linear relation between the salt content and the electric conductivity. This method works very effectively: and evaluating the level detection of the salt content of the new abrasive, judging whether the pollution of the salt content of the abrasive exceeds the standard or not, and evaluating the salt removing capacity of a dust removal system and the like by detecting the level of the salt content of the abrasive after dust removal treatment.
Description
Technical Field
The invention relates to a method for detecting the salt content of an abrasive used for sand blasting steel surface. Belongs to the technical field of steel physical and chemical inspection.
Background
The surface quality of steel is judged in the production process and before processing and use, and the next procedure can be carried out after certain requirements are met. Wherein the surface salt content is an important index. The steel surface contains excessive salt, which accelerates the electrochemical corrosion of steel and also affects the surface treatment of various products in the later period: such as adhesion, electrical conductivity, etc. of the surface lacquer.
Sandblasting is one of the most effective methods for treating the surfaces of steel and mechanical parts. The detection of the salt content on the surface of the steel plate product after sand blasting has been specified by standards abroad. But the detection of the salt content of the abrasive used for sand blasting has no unified standard and effective method at home and abroad. Because of the salinity that the abrasive material contains steel product to sand blasting treatment can have the salinity and pollute, carry out the salinity to the abrasive material and detect and can apply to: and evaluating the level detection of the salt content of the new abrasive, judging whether the pollution of the salt content of the abrasive exceeds the standard or not, and evaluating the salt removing capacity of a dust removal system and the like by detecting the level of the salt content of the abrasive after dust removal treatment. Therefore, it is necessary to find a method for detecting the salt content of the abrasive used in the sand blasting.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for detecting the salt content of the abrasive used in the sand blasting treatment aiming at the prior art, which can effectively detect the salt content in the abrasive and ensure the normal operation of the next procedure.
The technical scheme adopted by the invention for solving the problems is as follows: a method for detecting the salt content of abrasive used on the surface of steel treated by sand blasting includes such steps as preparing a series of standard salt solutions with known concentrations, measuring their electric conductivities, plotting the linear relation between salt content and electric conductivities, extracting the salt from abrasive, measuring its electric conductivities, and calculating out the salt content of abrasive according to the linear relation between salt content and electric conductivities.
Preferably, the method comprises in particular the steps of:
step one, blank test
Measuring and recording the conductivity of the used ultrapure water by using a conductivity detector, and measuring and recording the temperature of the ultrapure water by using a thermometer;
step two, drawing a standard curve
Preparing a series of standard salt solutions, measuring the conductivity of each salt solution, and drawing a curve of the salt content and the conductivity;
step three, salt extraction
Putting a certain amount of grinding materials into a container, adding ultrapure water, shaking and standing for precipitation, pouring out the upper solution, measuring the temperature of the upper solution by using a thermometer and recording;
step four, measuring the conductivity of the extracting solution by using a conductivity detector;
and step five, calculating the salt content of the extracting solution according to the standard curve drawn in the step three.
Preferably, the conductivity of the ultrapure water selected in the first step is not more than 5 uS/cm.
Preferably, when preparing the standard salt solution in the second step, the range of the solubility of the known salt solution covers the salt content of the unknown sample to be detected, and the curve is calibrated.
Preferably, the standard curve equation in step three is: salt content (ppm) ═ 1/2.0339 conductivity + 0.0267.
Preferably, before salt extraction in the third step, newly purchased abrasives and abrasives which are not subjected to dust removal after grinding are respectively sampled, and then salt extraction is respectively performed.
Preferably, when the salt extraction of step three is performed, if the solution is turbid, filtration is performed using a funnel and filter paper.
Preferably, 100. + -. 0.1 g of abrasive is taken from each of the two samples, placed in a 250 ml Erlenmeyer flask, 100 ml of ultrapure water is added, shaken for 5 minutes, left to stand for 1 hour, shaken again for 5 minutes, after precipitation, the upper solution is poured off, and the temperature of the filtrate is measured with a thermometer and recorded.
Preferably, three tests are respectively carried out on the two samples to obtain three groups of the electric conductivities of the extracting solutions of the two samples, the average values of the electric conductivities of the three groups of the extracting solutions are respectively taken, if one group of the electric conductivities of the extracting solutions has larger deviation, the average value with the two times of results being more similar is taken as an evaluation result, then the salt content of the average value is obtained according to a standard curve, and whether the salt content is smaller than a standard value or not is judged, if so, the salt content can.
Preferably, for the new abrasive, a salt content of less than 25mS/m is the usable abrasive; the detection of the abrasive without dust removal treatment was used to assess the level of abrasive salt content after blasting and at the same time to compare it with the abrasive salt content after dust removal treatment to evaluate the salt removal capacity of the dust removal system.
Compared with the prior art, the invention has the advantages that:
the method comprises the steps of extracting salt in the grinding material into a solution, measuring the conductivity of the extracting solution, and calculating the salt content of the solution according to the linear relation between the salt content of the solution and the conductivity, namely the salt content in the grinding material. This method works very effectively: and evaluating the level detection of the salt content of the new abrasive, judging whether the pollution of the salt content of the abrasive exceeds the standard or not, and evaluating the salt removing capacity of a dust removal system and the like by detecting the level of the salt content of the abrasive after dust removal treatment.
Drawings
FIG. 1 is a linear relationship between the salinity of the salt solution and the conductivity of the solution as configured in the examples of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Sample preparation: newly purchased abrasive samples 1 group of 3 samples, and polished abrasive samples without dust removal treatment samples 1 group of 3 samples.
Preparing equipment: conductivity detector, thermometer (precision 0.5 degree), balance (precision 0.1 g), 3 250 ml conical flask, 3 funnel and filter paper, disposable rubber-like film gloves, ultrapure water, stopwatch, a 100 ml glass measuring cylinder.
Blank experiment: a small amount of ultrapure water is sucked by an injector, 3-4 drops of deionized water are dripped into a honeycomb at the left end of the detector, the data displayed on the screen of the conductivity detector is read, and the data is recorded as follows: 0.8 uS/cm.
Preparing a standard solution and drawing a curve: a series of standard solutions were prepared and their conductivities were measured as shown in table 1:
according to the relationship between the conductivity and the salt content of a series of standard solutions measured in table 1, a linear relationship between the salt content and the conductivity of the solution is drawn, and as shown in fig. 1, the following formula is obtained by converting the linear relationship between the salt content and the conductivity:
salt content (ppm) ═ 1/2.0339 conductivity gamma +0.0267 (1)
Salt extraction in the grinding material: directly sampling the detected abrasive material from the packaging bag when the detected abrasive material is newly purchased; the abrasive material which is not subjected to dust removal treatment can be directly taken from the ground after sanding, and obvious garbage is removed.
100 + -0.1 g of the sample was taken out from the measurement sample, added to a 250 ml Erlenmeyer flask, added with distilled water 100 ml, shaken for 5 minutes, left to stand for one hour, shaken again for 5 minutes, and left to stand, and if the liquid is turbid after the precipitation, filtered using a funnel and filter paper. The temperature of the filtered aqueous solution was measured and recorded. Keeping the extracting solution and measuring the conductivity;
detecting salinity in the grinding material: sucking a small amount of solution to be detected by using an injector, and dripping 3-4 drops of the solution into a honeycomb at the left end of the detector. (note: the solution must fill the entire honeycomb and no air bubbles can be generated), the white lid is closed. And opening a switch of the conductivity detector and recording the reading gamma. Special attention is paid to: the conductivity is again expressed in units of uS/cm or mS/m. The test results are shown in table 2:
and (4) evaluating the results: the new abrasive has a salt content of 43.7uS/cm < 25mS/m and can be used for sand blasting steel. And the content of the used abrasive salt is too high to be used continuously, and necessary measures need to be taken.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (10)
1. A method for detecting the salt content of an abrasive used for sand blasting steel surface is characterized in that: the method comprises the steps of preparing a series of standard salt solutions with known concentrations, measuring the conductivity of the standard salt solutions, drawing a linear relation between the salt content and the conductivity, extracting the salt in the abrasive, measuring the conductivity of the abrasive, and calculating the salt content in the abrasive according to the linear relation between the salt content and the conductivity.
2. The method of claim 1, wherein the method comprises the steps of: the method specifically comprises the following steps:
step one, blank test
Measuring and recording the conductivity of the used ultrapure water by using a conductivity detector, and measuring and recording the temperature of the ultrapure water by using a thermometer;
step two, drawing a standard curve
Preparing a series of standard salt solutions, measuring the conductivity of each salt solution, and drawing a curve of the salt content and the conductivity;
step three, salt extraction
Putting a certain amount of grinding materials into a container, adding ultrapure water, shaking and standing for precipitation, pouring out the upper solution, measuring the temperature of the upper solution by using a thermometer and recording;
step four, measuring the conductivity of the extracting solution by using a conductivity detector;
and step five, calculating the salt content of the extracting solution according to the standard curve drawn in the step three.
3. The method of claim 2, wherein the method comprises the steps of: the conductivity of the ultrapure water selected in the first step is not more than 5 uS/cm.
4. The method of claim 2, wherein the method comprises the steps of: and step two, when the standard salt solution is prepared, the range of the solubility of the known salt solution covers the salt content of the unknown sample to be detected, and the curve is calibrated.
5. The method of claim 2, wherein the method comprises the steps of: the standard curve equation in the third step is as follows: salt content (ppm) ═ 1/2.0339 conductivity + 0.0267.
6. The method of claim 2, wherein the method comprises the steps of: respectively sampling newly purchased grinding materials and grinding materials which are not subjected to dust removal treatment after grinding before salt extraction in the third step, and then respectively extracting salt.
7. The method of claim 2, wherein the method comprises the steps of: in the salt extraction of step three, if the solution is turbid, filtration is performed using a funnel and filter paper.
8. The method of claim 6, wherein the method comprises the steps of: 100 plus or minus 0.1 g of abrasive is respectively taken from each of the two samples, the two samples are put into a 250 ml conical flask, 100 ml of ultrapure water is added, the flask is shaken for 5 minutes, the flask is kept stand for 1 hour, the flask is shaken for 5 minutes again, after precipitation, the upper solution is poured out, and the temperature of the filtrate is measured by a thermometer and recorded.
9. The method of claim 8, wherein the method comprises the steps of: and respectively carrying out three tests on the two samples to obtain three groups of the electric conductivities of the extracting solutions of the two samples, respectively taking the average value of the electric conductivities of the three groups of the extracting solutions, if one group of the extracting solutions has larger electric conductivity deviation, taking the average value with the results which are more similar in two times as an evaluation result, then obtaining the salt content of the average value according to a standard curve, and judging whether the salt content is smaller than a standard value, if so, the salt content can be used, and if so.
10. The method of claim 9, wherein the method comprises the steps of: for the new abrasive, a salt content of less than 25mS/m is a useable abrasive; the detection of the abrasive without dust removal treatment was used to assess the level of abrasive salt content after blasting and at the same time to compare it with the abrasive salt content after dust removal treatment to evaluate the salt removal capacity of the dust removal system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112975767A (en) * | 2021-02-01 | 2021-06-18 | 江苏鑫氟特能源装备有限公司 | Method for reducing salt content of abrasive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112975767A (en) * | 2021-02-01 | 2021-06-18 | 江苏鑫氟特能源装备有限公司 | Method for reducing salt content of abrasive |
| CN112975767B (en) * | 2021-02-01 | 2023-02-21 | 江苏鑫氟特能源装备有限公司 | Method for reducing salt content of abrasive |
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Application publication date: 20200828 |