UPC666.658:53-083
National Standard of the People's Republic of China
GB/T 15344—94
Methods for physical test of talc
Promulgated on December 22, 1994
National Technical Supervision Bureau
Implementation on August 1, 1995
National Standard of the People's Republic of China
wwW.bzxz.NetMethods for physical test of talc
Methods for physical test of talc Content and scope of application
GH/T15344-94
This standard specifies the physical test methods for talc, including moisture, dustiness, pH value, powder sedimentation, amphibole, roughness, abrasion resistance, accumulation, fine slippery particle size, whiteness, oil content and magnetic separation. This standard is applicable to the physical property test of talc and talc powder. 2 Reference standards GB3 Test end GR15341 Talc GB15312 Talc powder 3 Terminology 3.1 Wear loss The wear loss of quartz and other minerals in the powder dispersion is expressed in g. 3.2 Wear loss The wear loss of talc powder is measured by a phosphorus acid or plastic material with a paper sieve, and its technical indicators meet certain requirements. 3.3 Wear loss The talc powder dispersion is filtered through a special dynamic grinding machine and a fixed frame grinding machine, and then reduced by a 180i wear screen. 3.4 Screening end point
Screening test end point: When the ratio of the hand sieve 1m+screen material to the test material is less than 0.05%, it is called the cross-separation point. 4 Samples
4.1 Sample collection
4.1.1 The collection of stone samples shall be carried out in accordance with 7.3 of GB15341. 4.1.2 The talc samples shall be collected in accordance with 6.3 of GH15342. 4.2 Preparation of test pieces 4.2.1 The talc blocks sent to the laboratory shall be crushed, mixed and divided according to the plasticization quartering method to make the required samples and test pieces for each test. The remaining test pieces shall be used as spare samples. 4.2.2 The talc blocks sent to the laboratory shall be divided according to the plasticization quartering method to make the required samples for each test. The remaining test pieces shall be used as spare samples. 4.3 Test selection 4.3.1 The test pieces shall be prepared according to Table 1. Approved by the National Technical Supervision Commission on December 22, 1994 and implemented on August 1, 1995. 5 Test method GB.T 15344
Table 1 Number of test columns and samples required for each test item Test items
Open flow energy
Stone type Stone excavation mineral
Integrated machine
Particle size distribution
Oil grass
Long materials
5.1 Method for determining moisture content in run stone phase
5.1.1 Principle of the method Zhang fee
Sample!
Each test yield
Total test mixing plate
Three tree moisture refers to the ratio of the sample to the sample mass after the sample is baked at 105～111℃, and is expressed in percentage.
Material and equipment
The sensitivity of the tester is 0.c051;
Parts: Sensitivity is 0.001g
In the explosion box, the temperature adjustment range is 0~300, and the temperature controller sensitivity is 1℃. Operator: Internal variable packing glue:
Weighing bottle: diameter is about am, height is about 3arrml. 5.1.3 No powder water (4 method) Test steps Weigh about 5 test samples to 0.0001%>+ into a single weighing bottle, and quickly test the new sentence. 5.7-3.7
5.1.3.2 Place the weighed bottle in an electric drying oven at 105~110°C and dry the bottle for 1.5~2h. Then remove the bottle cap, take out the sample and dry it to a certain degree (accurate to 0.0001g). 5.1.3.3 Return the sample to a dryer and weigh it until it reaches a constant weight. 5.1.4 Quick determination of moisture content of slippery objects (method 1) 5.1.4.1 Weigh the sample of item 55 (accurate to 0.0CC18) and place it in a dish with a moisture content of 5.1.4.2 Determine the moisture content according to the moisture accumulation procedure. At 303~110℃ for 10min, 5.1.5 Calculation of moisture content of the sample (1x1) (guaranteed to the second decimal place): 3x1 GB/T15344-94: — mass of sample and weighing bottle before drying; 2x1 - mass of sample and weighing bottle after drying, g; test mass·g. Take the average of the two parallel test results as the reference value. 5.1.5 Allowable error The absolute difference between the two parallel test results shall not be greater than the allowable error (see Table 2): otherwise, the test shall be repeated. Table 2 Allowable error of moisture content test results 5-2 5.2.1 Principle of the method 5.~ J. o
21. 0~3. c
3. 5~-10 x
The dust base of the stone powder before is 1. After the sample is mixed with a certain amount of, pour it into a neutral station with a low qualitative potential, calculate the total area of black spots distributed on the filter paper that is not less than 0.0% mm, expressed in mm/g, 5.2.2 Materials and instruments
Analysis of no level sensitivity is 0,0001g
Buchner filter.4: Inner diameter of about mm
Beaker: 150ml.:
Quick qualitative filter paper (should be free of black spots)
Dust standard film.
5.2.3 Test steps
52.3. Weigh 1g of the sample (accurate to 0.0018). Collect it in a 150mL cup. 5.2-3.2 Add 20mT. distilled water, stir well, and put it into the cup. Filter through a Brinell filter with a quick qualitative filter paper, clean the wall with a small amount of distilled water, pour the rinse water into the Brinell funnel, gently use the funnel to make the sample evenly distributed on the filter paper. 5.2.3.3 After the separation, check the filter paper and the dust mold standard picture and record the number and area of the points not less than U.03nm. 5.2.4 Calculation of results
Talc dust pressure (mm*/g) is calculated according to formula (2) (the first digit after the decimal point is determined) E
Total black spot surface area, m
In the formula: B-
one sample mass·8
The arithmetic mean of the results of 8 parallel tests is taken as the estimated value. 5.2.5 Permissible difference
The absolute error of the results of two parallel tests should not be greater than 0.2 1nm/g. Otherwise, it should be re-measured. 5.3 Determination of water content of talcum powder
5.3.1 Principle of the method
The water content of the liquid H refers to the sample or the sample being separated into a certain amount of water, and the μH value of the source liquid is measured by a pantograph. 5.3.2 Materials and instruments
Analysis temperature: base: 0.000181
temperature-controlled electric furnace with asbestos mesh;
acid analyzer: accuracy: 0.0921H
. night T. L
g. Method: speed,
GB/T 15344—94
h-Algae drainage water: first boil to remove the second chemical and coolant to room temperature, pH value is 6.8~7.2.5.3.3 Test steps
5.3.3. Take 5g of sample (5,000 μl) and place it in a 20ml beaker. 5-3.3. Pour 10ml of distilled water into the beaker and stir with glass sample to make the layer completely wet, then add 93ml of water and mark the height of the surface of the beaker.
5.3.3.3 After the beaker is boiled on the electric furnace, adjust the temperature of the electric furnace to below 300W + low temperature (the sample should be disconnected and the distilled water should be added during the sample). Remove it and cool it to temperature. 5.3.3.4 Use a slow flow to pass through the pool, use 92mL beaker to collect enough liquid, and remove about 30mL of the source liquid. The rest is filtered with a sieve and the pH value is recorded.
5.3.2 Calculate and take the arithmetic mean of the two test results as the report value. 5.3.5 The final error of the results of two parallel tests should not be greater than 0.2. Otherwise, it should be re-measured. 5.4 Determination method of talcum powder precipitation source
5.4.1. The main principle of this method is to add 15% sample and a certain amount of water in the furnace, stir the part (turn the first half), half the water wave, lift the porcelain cup with the upper water liquid disappear (no white floating objects), the ratio of the mass of the sediment in the furnace to the mass of the sample, expressed as a percentage.
5.4.2 Materials and instruments
Analytical instrument, sensitivity 0.0001K
b Thermostatic plate 0.01 g
Electric dry combustion box: Adjustable temperature 0-355℃ Controller sensitivity 1℃: d Temperature-controlled electric furnace with sieve:
Temperature-controlled electric furnace (with color-changing silica gel):
Cup; 400mL
h-Quantity: 20)) rml. or 25:l mL; main reagent.
5.4.3 Test steps
5.4.3.1 Weigh 15g of the sample (accurately adjusted to 0.01g) and place it in a 400mL beaker with constant weight, and make a mark on the outside of the beaker at 200ml.
5.4.3.2 Add 5ml of hot water in the middle of the beaker, stir the sample with a glass ribbon until the sample is completely wet, then add 150ml of water, stir for 60 revolutions, about 205.
5.4.3.3 Open the top of the beaker by 1ia. Remove about 100mL of the urine liquid, condense the remaining water to reduce to about 100ml.5.4.3.4, then add water to 200mL, stir according to the above method Stir, and let it stand. Pour the water solution in the left and right sides, and change the mixture as the north and south branches do, until the water is smooth after 1m and half of the layer is smooth (no white substance is present), and then pour out the water. 5.4.3.5 Place the beaker on an electric stove and evaporate to the bottom at low temperature. 5.4.36 Place the beaker in an electric oven at 105-110℃ for 0.5-1h, take it out, put it in a refrigerator, and weigh it to 0.001g after cooling to room temperature. 5.4.4 Calculation of the recovery percentage of the powder, the formula (3) is calculated (keep the second decimal place): x, -\-×100 ||Wherein, -: sintered and organic materials
olefins base 1R1
3—test mass, g.
The average value of two parallel tests shall be reported as the value. 5.4.5 Tolerance
The absolute difference between the test results of two parallel tests shall not be greater than 0.3, otherwise it shall be repeated. 5.5 Specification determination method
5.5. Principle of the method
The mass of the slip layer of the slippery material refers to the mass of the slippery part in the unit plate. It is determined by a specific gravity bottle. The volume of the test rod is determined by dividing the volume of water or oil in the bottle by a certain mass of the sample: the ratio of the sample volume to the volume is the density. 5.5.2 Material Materials and equipment:
Analytical balance: induction heat 0.0008;
Electric constant temperature water pot, temperature 1: b.
Core: vacuum media with vacuum pump! d.
Electric furnace with 7 cotton mesh;
Specific gravity bottle: 50mL
Temperature;
5-5-3 Vacuum operation of specific gravity bottle (A) Test steps 5.5.3.1 Use appropriate, known mass specific gravity bottles to fill with water (bubbles in the specific gravity bottle must be removed). Put in a constant temperature water bath at 21:0.5h, take out, quickly dry with filter paper, and squeeze the capillary end with water or kerosene. Weigh the pan (accurate to 0.0001 g):
5.5.3.2 Coal wet density (e) is calculated according to formula (4) (after retaining the minimum value): P:
mass of coal pool·g:
wherein,
m. mass of water, B;
0. density of water at 71-→25°C/.
5.5.3.3 Wash the specific gravity bottle thoroughly, remove the outer cover and weigh it again (accurate to 0.0001g) 5.5.3.4 Weigh about 5g of the original dried sample into the specific gravity bottle, add the bottle and weigh it (accurate to 0.0001g). 5.5.3.5 Pour a small amount of base fuel into the specific gravity bottle and slowly stir to wet the sample completely. Then inject kerosene into the specific gravity bottle until it is 2/3 full. 642
5.5.3.6 Place the specific gravity bottle in a vacuum desiccator and ventilate for 2 cm2 to remove the air trapped in the test column. At this time, the pressure in the desiccator should not exceed 0.02 MPa1.
5.5.3.7 Take out and shake for 1 minute. Continue to shake until all the air in the sample is removed. At this time, there should be no air in the pycnometer. 5.5.3.8 Fill the pycnometer with kerosene. Place it in warm water at 2571℃ for 0.5h, then take it out and press it back to dryness with mixed paper. However, the kerosene will continue to be spread out. Weigh it (accurate to 0.0001g). 5.53-9 Calculate the sample weight (p) according to formula (5) (the result should be rounded to two decimal places): 5
Formula \——g;
--Compare the weight of the pycnometer with kerosene...
GB/T15344-54
, compare the weight of the sample with kerosene and the sample:
The average value of the results should be reported. 5.5.4 Test steps for the five-step method 5.5.4.1 Take about 5 mL of the sample from the film, put it into a specific gravity bottle with a known mass pressure, dry it, cover the bottle, and stain the plate. (
5.5.4.2 After the test bar is moistened by adding 25 mL of freshly distilled water, place it on an electric furnace (asbestos can be used as a pad), remove the electric furnace, and keep the hot water in the hot water tank for about 10 minutes until the sample is completely washed. At this time, care should be taken not to allow the sample to reach a specific gravity of 12.5 m. 5.5.4.3 Cool it to room temperature, use fresh boiling water and cool it down to a constant surface of the bottle below 12.5 m. The bottle should be sealed (there should be no air pool in this assembly), and quickly Wipe the outside of the specific gravity bottle dry, but do not remove the water from the capillary end. 5.5.4.1 Remove the sample water from the specific gravity plate. After cleaning, add fresh distilled water that has been boiled and cooled to room temperature so that the water surface of the bottle is 2 to 3 meters above the reference mark. Cover the bottle, quickly wipe off the water from the capillary end, weigh (accurate to 0.0001) and record the water temperature. 5.5.4.E Test density (p) is calculated according to the formula () (retain two digits for small points): P = m, -m
comparison with the test and water quality
—. The density of water at + · g/em. See Appendix A. Take the arithmetic half-mean of two parallel tests as the reported value 5.5.5 The allowable difference
of the two test results shall not be greater than 0.1. Otherwise, it shall be re-determined. 5.6 Method for inspection of talc minerals
5.6.1 The talc sample contains a certain type of mineral (needed to be talc) in the X-ray beam. The X-ray diffraction of the mineral appears in the specific diffraction. The sample is not talc-containing minerals. 5.6-2 Materials and safety devices
, X-ray diffraction area:
hT industry day - sensor 0. 01 :
Reading test span: hole diameter 74um,
5.6.3 Test stand
5.6.3.1 Weigh about 11 samples, grind them in milk until they all pass through the sieve with a hole diameter of 74um, 5.6.3.2 Put the prepared samples in the sample box to make sample pieces. 5.6.3.32 Put the test pieces on the sample stand of the X-ray diffractometer, turn on the machine according to the monthly procedures and irradiate. The working conditions of the instrument are generally: kuxa35kV, 15mA.Ni method film, the scanning angle of the diffractometer is 2*/min, the proportional counter high voltage is 17coV, the paper speed is 1250mm/h, and the scanning area is 6-80
GE/T15344-94
5.6.3.4 The obtained irradiation is shallow, mark the corresponding value according to the 28 angle position, and compare it after adjustment ASTM standard card to determine whether the test finds amphibole asbestos minerals.
5.7 Stone powder fineness determination method
5.1 Principle
The fineness of the stone powder refers to the percentage of the ratio of the test volume to the test volume after the test is passed through a flow tax test. 5.2 Material equipment
Test end: should comply with GB6C3. Screen diameter 230m: Vibrating screen machine: lifting frequency 147 times/mm, rotation radius 125mml analysis without balance, sensitivity 3.10015
Air flow screen: working efficiency 2000~EC05Fa electric heating oven, temperature adjustment range 0-3C0. Controller sensitivity 1 hot electric furnace with right belt net,
Water pressure control equipment (self-made) pressure (.02~0.03MPa:Table: diameter 50~70mm
Beaker: 100mL, 150mL;
Small wooden head
Ethanol (95%), chemically pure:
Stopwatch +
Dryer, with color-changing silica gel inside;
Water basin 1
Small wool.
5.7.3 Sieve method (A method) Test steps
5.7.31 Weigh 20g (accurate to 0.0001g) of the dried sample into a 400mL beaker, add an appropriate amount of ethanol to the required standard, and use glass to stir to fully moisten the sample. 5.7.32 Pour the prepared sample into the test sieve, rinse the beaker and glass with water several times, and the water should flow into the sieve each time. 5.7.33 Shake the sieve frame with both hands and pour the test sieve into the water-filled beaker. In a bowl of water, keep the water level 1~1.5cm above the sieve, gently shake the test sieve, and carefully rinse for 1~2min+ until most of the material passes through the test sieve. 5.7.34 Use a low-pressure water group with a pressure of 0.02~-0.03MP to rinse the material on the sieve surface. No material is allowed to be stored outside until the liquid passes through the sieve. It is considered that the screening end point has been reached. The external washing time is about 10min. 5.7.35 Use distilled water to remove the remaining material from the empty beaker, place the beaker on the thermostatic electric stove, and place the bottom 5.7.3.6 Place the beaker in an electric drying oven and dry at 105~110°C for 0.5-1h. Take it out and put it in a drying chamber to cool. Weigh it (accurate to 0.0001g). 5.7.4 Thousand-sieve method (-) (B method) Test steps
5.7.4.1 Weigh 20g of the sample after it is provided <accurate to 0.01g>. Put it into the test sieve with a sieve bottom, select the diameter and effect, and spread the sugar sample evenly on the sieve. Put on the sieve cover and replace it. Fix the shrimp on the sieve frame. 5.7.4.2 Turn on the power supply and start the sieve machine, and press the sand filling timer at the same time. 5.7.4.3 When the sieving is completed for 5 minutes, cut off the power supply: stop sieving. 5.7.4.4 Take out the test source and the test material together, use a small brush (no hair loss) to brush the talcum powder inside and around the sieve into the sieve, sieve by hand for 15 seconds, tap the sieve for about 2 times, and move all the sieve residues to the above-known mass of the surface-removed blood. Weigh (accurate to 0.0001g)
5. 7. 4. 5 Check the sieving end point according to 5. 7. 6. When the ratio of the mass of the sieve to the mass of the sample is less than 0. 035, the screening is considered to be finished, otherwise continue screening for 2min according to step 5.4, then check the screening end point, and repeat this process until the screening end point is reached. 5.7.5 T screening method (>iC method) test steps
GB/T1534494
5.7.5.1 Weigh the test sample 2R after drying to n, (1). The total number of people with sieve bottom test sieve is slightly moved, so that the test is held on the temporary network and 37 pools are well.
5.7.5.2 Place the second sieve on the teacher at the end of the rotating air flow, cover it with a cross cover, 6.7.5.3 Turn on the power supply. Start the 4-flow sieve, and install it at the same time The stopwatch is used to record the time. The negative pressure is set to 3×13°P at the end of the screen. The powder on the screen cover is not melted. The talcum powder on the end falls into the screen. 5.5-4 5 sifting is cut off and the talcum powder on the inner surface and the inner periphery of the screen is swept into the station with a small hair (no hair). After sifting 13≤, check the sieving end point. When the ratio of the mass of the sieve to the mass of the sample is less than 0.U35%, it is considered that the sieving has been normalized. According to the .7,5 method, after sieving 155, check the sieving end point again. Repeat this process until the sieving point is reached. 5.7.6 Screening 5-7.E.1 Place the chemical on the bottom of the test sieve, lift the sieve and tap it gently. The number of taps is about 9 times per dose. Screen 1 5-7-E.2 Remove the sieve and use your hand to transfer the material on the bottom of the sieve to the surface of the test sieve of known mass. Weigh it (accurate to C.C.G.D.1B). 5.7.6.3 When the material on the sieve is equal to the sample mass, When the ratio of annual to annual is less than 3.035%, it is considered that screening has reached the end point. After screening is completed, calculate the residue percentage X (must be calculated according to formula (7) and retained to the second decimal place): X: = m = \* × 10
flow (or surface III) and the mass of the residue: Yaohuan (or surface blood) quality·B:
m-.-test column mass.8.
Take the average value of the results of two parallel tests as the report. 5.7.8 Allowable Difference
The absolute error of the two test results shall not be greater than the allowable difference (see Table 3). If not, it shall be re-determined. Table 3 Allowable Difference of Sieve Residue for Test Results
C 52--1. 5D
5.8 Determination Method of Abrasion Consumption of Talc
5.8.1 Principle of the Method
Allowable Difference
Average Report (-)
1 Method 2)
The abrasion resistance of talcum powder refers to the abrasion resistance of a certain amount of test sample on a certain material, which is measured by a test machine and is expressed by the difference in quality before and after the test.
5.8.2 Material Qualification
Stone instantaneous consumption test machine, Figure 1;
Overall dimensions: 10mmX81cmm×1600mm+Axis speed: 1470±20r/minF
Device rotation 03m
Mixing precision ruler. 310mm×310mm×47mm
Grinding wheel size, 0mmt60mml
GB/T15344-94
Surrounding 1 Stone grid seat group consumption test machine
—Control panel+2-1 German drawing road; 3—Agitator motor 11—Lifting mixer; 5—Water impact, 6—Multiplication—System, 8—Spindle motor—Soul water capture; 10 Wing consumption 11 -main; 12: cover wear net: 13-original account: 14: machine dyeing wear piece size: 140mm×40mm. Aperture 0.15mm×0.25mm1 liquid ratio, 2000:400.
Analysis without balance: quantity is 0.0001g:
drug volume is 0.1g
electric heating in the box, the adjustment is 03 death, the temperature controller is 1. Explosive device (with color-changing adhesive inside)
Full cup: 1000ml..3000ml,
Rubber kidney
5.8.3 Test requirements
5.3.1 Weigh 400g of the test tube after baking (accurate to 0.1B). Put it into a container filled with 3L of water. Stir it. After it is fully dispersed, disperse the talc powder into the stirring water of the bladder consumption tester, and then add clean water until the water level is about 20 meters. Stir with a dynamic mixer for min. At this time, the dispersion degree of talc is 2% 5.9.3.2 The standard of wear and tear
Put the copper wear mesh in the electric heating dry light, dry it at 105110℃ (plastic wear mesh at 80℃) until constant temperature or then move it into the dryer to cool to room temperature, weigh it (to ensure accuracy of .000·1μm), and mark the surface and inside of the wear mesh (the surface is the surface between the two sides of the wear mesh), and put the wear mesh into the dryer. GB/T1534494
6, fix the light at both ends of the wear and tear respectively with screws, fix the light of the mesh with plastic rope on the grinding mesh (A), and fix the light of the mesh with hole () on the whole assembly: 5.8-3-3 Put the installed wear mesh on one side close to the hemp pulley. Hang the plastic rope at the A end on the screw of the fixed table of the test machine, and put the R end of the wear and tear mesh into the large end hole of the light. In this way, all three wear screens are installed on the test machine. Use the force method to check whether the balance and compensation are correct, whether the AB end of the fixed wear screen is installed correctly, whether the material rope at the A end of the wear screen is hung in the two holes, and whether the single rust is in the screw hole at the end of the wear screen. Whether the combination of the soil shaft and the bearing is stable, whether there is pumping when rotating, whether the side wear wheel and the shaft are in motion, 5.8.3.4 Adjust the flow rate of the material dispersion, adjust the average flow rate of the three drainage pipes of the mixing water to about L/min, and keep the distance from the screen 1~2CⅡ to reduce the internal stone powder separation liquid. While the non-water sound is being corrected, the circulating water is collected. Check the circulation section and check whether the liquid is flowing in the wear net. Note that the circulating water system must be idling, otherwise the circulating water system will be burned. 5-8.3.5 After the spindle motor is running normally, start the automatic timing system and test it to stop automatically after 180 minutes. 5.8.36 Drain the circulating slider powder and stop the circulating water pump. Remove the weight of the A wear net at the B end, and then use the flash test machine to test the machine on the upper and lower grinding room + lemon loosen the nails at both ends of the mesh, remove the concave wear net, rinse it with clean water and use a light brush to clean the residue and straight wire on the wear net. 5.8.3.7 Remove the circulating water pump pipe and replace it with the flushing water pipe. Remove the foot wheel, filter the water, and wash the clean flushing water for the next month: 5.8.3.8 Put the cleaned low-grinding mesh into the drying box: dry the mesh at 1-5~11°C (plastic mesh at 80°C) to constant weight, cool it in a dryer to a constant weight, and weigh it (accurate to G001*5.8.4 Calculate the result: The wear degree is calculated according to formula (8): M=[m:-m,)×i
Where M is the grinding viscosity. The wear loss of the mesh is measured by the grinding wheel. The grinding target mesh is the grinding target mesh after grinding. Take the grinding loss of two or three pieces of the grinding mesh and report the average value. 5-B-5 tolerance
The tolerance of the two solutions is 15%, and the tolerance should be adjusted to 5.9 Method for determining the bulk density of talc
5.9.1 Principle of the method
It refers to the volume occupied by the residual particles of a certain mass and can flow. The density of talc refers to the volume occupied by the particles of a certain mass. 5.9.2 Material printing instrument
Shang Bulk Density Instrument, see Figure 2;
Specific degree, see Figure 3;
Electric heat drying range is 0~20
Industrial large: Sensitivity is 0.01
Brush:
Scrape it with a suitable sharp knife, cardboard strip, wood or ruler paper: smooth paper.
GB/T15344-94
Figure 2 Schematic diagram of volume density inspection
1-net trap: 2--table; 3-level: 4-support grid: 5-support device 6-standard: 7-hand-held; 8-case board: 0-adjustment frequency: 5.9: 3 Talc volume density measurement test steps 5.9.3.1 Place the loose parts on the flat table and adjust to make it level. 3.2 Take 25g (0.01g if necessary) of the sample from the sieve after 7 and put it into the funnel. Use the bristle sieve to move counterclockwise to make the sample flow slowly. 5.9.3.3 Use the cone of the sample to level it, then remove it and pour the sample into the measuring box. , weigh (accurate to 1.01g), repeat three times and record.
5.9.4 Volume determination of talcum powder Test card Steps 5.9.4.1 Fold a piece of smooth paper and place it on the mother of the filter. 5.9.4.2 Weigh the sample after drying (accurate to 1.01g). Let the sample flow slowly into the measuring tube through the paper wall, and use a brush to carefully clean the talcum powder stuck on the wall. 5.9.4.3 - Press the pile tightly with your hands. Lift the pile to a height of 40 mm with one hand and let it fall. Then lift it to a height of 4 cm and let it fall again. Repeat this 50 times. After every 15 times, change the direction of force by about 70 degrees clockwise or counterclockwise. Then scrape it flat and record the volume occupied by the pile. 5.9.5 Calculation of results: Powder volume density (E) is calculated according to formula (9) (retained to the second decimal place) [9] The volume density (B) is calculated according to formula (10) (retained to the second decimal place), (10) where B is the volume density.x/ml..
Test volume density ·8/ml.
-sample mass basis + 81
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.