CN102441526A - Method for dry screening material and measuring average particle size and screening device - Google Patents
Method for dry screening material and measuring average particle size and screening device Download PDFInfo
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- CN102441526A CN102441526A CN2011104048576A CN201110404857A CN102441526A CN 102441526 A CN102441526 A CN 102441526A CN 2011104048576 A CN2011104048576 A CN 2011104048576A CN 201110404857 A CN201110404857 A CN 201110404857A CN 102441526 A CN102441526 A CN 102441526A
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- gypsum
- screening
- screening plant
- standard screen
- average grain
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- 238000012216 screening Methods 0.000 title claims abstract description 64
- 239000002245 particle Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 title claims abstract description 8
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 85
- 239000010440 gypsum Substances 0.000 claims abstract description 85
- 238000005303 weighing Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 239000012774 insulation material Substances 0.000 claims description 15
- 238000007873 sieving Methods 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical group [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000011505 plaster Substances 0.000 description 2
- 238000000790 scattering method Methods 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses dry screening gypsum and a method for measuring the average particle size thereof, which comprises the following steps: accurately weighing the dried desulfurized gypsum on the top layer screen surface of a standard screen, covering a top cover, preheating for 40-50 min at 50-55 ℃, and then placing on a vibrating screen machine for screening for 5-10 min; after screening, preheating the standard sieve and gypsum for 40-50 min, and vibrating the sieve for 5-10 min; accurately weighing the mass of the gypsum particles on the screen surface of each layer, and calculating the average particle size of the gypsum. The invention also discloses a screening device for the method. The method and the device have the characteristics of simplicity, strong practicability, rapidness, accuracy and the like, and are simultaneously suitable for screening and average particle size measurement of other materials which are easy to be damped and have particle sizes of 1-100 mu m.
Description
Technical field
The invention belongs to particulate samples detection technique field, relate in particular to a kind of gypsum dry screening and average grain diameter measuring method thereof, this method also is adapted to other moisture-sensitive simultaneously, and particle size range is measured in the screening and the average grain diameter thereof of 1～100 μ m material.
Background technology
In the experimental study and production practices of various fields such as chemical industry, material, environmental protection, the distribution of grain diameter all has great significance with measurement.The method of measuring particle size distribution at present mainly contains sedimentation, sieve method, microscopic method and laser scattering method etc.; It is less that wherein microscopic method and laser scattering method are measured particle size range; Accuracy is higher, but because apparatus expensive is unfavorable for that manufacturing enterprise uses.The gypsum main component is a calcium sulfate; Be a kind of widely used industrial materials and construction material; Mainly be used as set retarder in the cement production process, plaster of Paris, semi-hydrated gypsum plate etc., particle size range is to influence the major parameter that gypsum extensively utilizes generally at 10～80 μ m.Absorb water in air easily and divide the reunion of making moist owing to gypsum is exposed in the air; Cause relatively difficulty of dry screening; Measure the method that the gypsum particle diameter generally adopts sedimentation or wet sieving in the commercial production; But sedimentation requires particle profile rule, and is bigger for the measure error of short cylinder gypsum particle; The wet sieving complex operation, and gypsum particle is under the flushing of current, has to be partly dissolved, and influences the degree of accuracy of measurement result.
Summary of the invention
Gypsum particle accumulates on the problem that the upper strata compass screen surface is difficult to disperse in the dry screening gypsum process in order to solve; The invention provides a kind of " preheating-screening-preheating again-screening again " method of standard screen outer wall parcel insulation material simultaneously; Indoor realization in drying is effectively sieved gypsum, can obtain results such as the distribution of gypsum particle diameter, average grain diameter.
The method that a kind of dry screening gypsum and average grain diameter are measured, step is following:
(1) agglomerated grain in the gypsum of gently pressing, crumb, constant temperature 10～15h under 45～55 ℃ of conditions;
(2) the gypsum drying is cooled to room temperature after, weighing 35～45g gypsum places preheating 40～50min under 50～55 ℃ of conditions in the top layer compass screen surface of screening plant with screening plant and load weighted gypsum, once sieves 5～10min.The sieve environmental condition of shaking is following: air humidity remains on below 75%, and sieve shakes number of times: 180～250min
-1, number of times: 130～160min is hit on the top
-1
(3) after screening finishes screening plant and gypsum are placed under 50～55 ℃ of conditions preheating 40～50min once more, regrading 5～10min;
(4) after regrading finishes, the collection of each layer compass screen surface gypsum particle, weighing are obtained each layer compass screen surface gypsum quality.Calculate the gypsum average grain diameter with the harmonic mean particle diameter computing formula.
The quality purity of said gypsum is more than 70%, CaCO in the gypsum
3Content is lower than 15%, and the gross mass content of other impurity is lower than 20%
A kind of screening plant that is used to realize above-mentioned dry screening gypsum and average grain diameter measuring method thereof comprises several standard screens, according to the aperture from big to little, put additional tray under the bottom standard screen, additional top cover on the top layer standard screen from top to bottom successively; Described standard screen, bottom tray and top cover are stainless steel, and described standard screen outer arm is enclosed with insulation material; The external vibrating sieving machine of described screening plant.
Described standard screen diameter is preferably 20.5cm, high 5cm, the preferred thick 0.5cm of described insulation material, wide 4cm.
As further preferred scheme, described standard screen has 6, and the aperture of each standard screen from top to bottom is respectively 0.075,0.063,0.053,0.045,0.037,0.030mm.
Described insulation material preferably adopts the phenolic resins expanded material.
That the inventive method has is simple to operate, quick and precisely wait characteristics.Owing to having adopted the preceding method of screening, can guarantee that gypsum can be because of absorbing airborne moisture reunion and can not passing through sieve aperture to gypsum and standard screen preheating and standard screen outer wall parcel insulation material; Adopt the method for twice screening of twice preheating simultaneously, reduce experimental error, make size data more accurate.Simple in structure, the safety of screening plant of the present invention in addition, reasonable in design, institute's accepted standard sieve and vibrating sieving machine are common equipment, and cheap, are easy to extensively implement in inside plants.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is that the gypsum samples in the embodiment of the invention 1～5 detects the particle diameter distribution map that obtains through the laser particle size distribution instrument.
Fig. 3 screening plant structure diagram.
The specific embodiment
Below in conjunction with the specific embodiment the present invention being done further description, is not the restriction to protection domain.Gypsum purity is 92% in this specific embodiment, CaCO
3 Content 1%, other impurity contents 7%.Occur for avoiding repeating, below repeat no more among each embodiment.
A kind of screening plant that is used to realize dry screening gypsum and average grain diameter measuring method thereof; Comprise 6 standard screens 1; The diameter of 6 standard screens is 20.5cm, high 5cm, and the aperture of each standard screen from top to bottom is respectively 0.075,0.063,0.053,0.045,0.037,0.030mm.With 6 standard screens according to the aperture from big to little, put successively from top to bottom, additional tray 3 under the bottom standard screen, additional top cover 2 on the top layer standard screen; Described standard screen 1, pallet 3 and top cover 2 are stainless steel, and standard screen is wrapped with the phenolic resins expanded material as insulation material, the thick 0.5cm of insulation material, wide 4cm.The external vibrating sieving machine 4 of described screening plant.
Adopt aforesaid screening plant, agglomerated grain in the gypsum of gently pressing, crumb, and place under 45 ℃ of conditions behind the constant temperature 15h, be cooled to room temperature in the drier.Accurately weighing 35～45g gypsum covers top cover 2 in parcel insulation material standard screen 1 top layer compass screen surface.Standard screen and load weighted gypsum are placed preheating 50min under 50 ℃ of conditions, sieve 10min on the vibrating sieving machine 4; Shake and sieve surrounding air humidity 65%.After screening finishes standard screen 1 and gypsum samples are placed under 50 ℃ of conditions preheating 40min once more, sieve 10min on the vibrating sieving machine 4.Screening is collected in each layer compass screen surface gypsum particle on the pan paper after finishing, accurate each layer of weighing compass screen surface gypsum particle quality, and parallel screening three times, measurement result is as shown in table 1.Calculate the gypsum average grain diameter with the harmonic mean particle diameter computing formula, the gypsum average grain diameter is respectively 0.035mm, 0.035mm, 0.0349mm.
Table 1 embodiment 1 each layer compass screen surface gypsum quality/g
Adopt the screening plant identical with embodiment 1, agglomerated grain in the gypsum of gently pressing, crumb, and place under 45 ℃ of conditions behind the constant temperature 15h, be cooled to room temperature in the drier.Accurately weighing 35～45g gypsum is in parcel insulation material standard screen 1 top layer compass screen surface.Standard screen 1 from top to bottom, pore size is followed successively by 0.075,0.063,0.053,0.045,0.037,0.030mm and bottom tray 3, covers top cover 2.Standard screen 1 and load weighted gypsum are positioned over preheating 50min under 50 ℃ of conditions, sieve 10min on the vibrating sieving machine 2; Shake and sieve surrounding air humidity 80%; After screening finishes standard screen 1 and gypsum are placed under 50 ℃ of conditions preheating 40min once more, sieve 10min on the vibrating sieving machine 4, after screening finishes; Each layer compass screen surface gypsum particle is collected on the pan paper; Accurate each layer of weighing compass screen surface gypsum particle quality, parallel screening three times, measurement result is as shown in table 2.The gypsum average grain diameter is respectively 0.045mm, 0.0447mm, 0.0438mm.
Table 2 embodiment 2 each layer compass screen surface gypsum quality/g
Adopt the screening plant identical with embodiment 1, agglomerated grain in the gypsum of gently pressing, crumb, and place under 45 ℃ of conditions behind the constant temperature 15h, be cooled to room temperature in the drier.Accurately weighing 35～45g gypsum is in parcel insulation material standard screen 1 top layer compass screen surface, standard screen 1 from top to bottom, pore size is followed successively by 0.075,0.063,0.053,0.045,0.037,0.030mm and bottom tray 3, covers top cover 2.Standard screen and load weighted gypsum are placed preheating 50min under 50 ℃ of conditions, sieve 10min on the vibrating sieving machine 4; Shake and sieve surrounding air humidity 65%; Screening is collected in each layer compass screen surface gypsum particle on the pan paper after finishing, accurate each layer of weighing compass screen surface gypsum particle quality, and parallel screening three times, measurement result is as shown in table 3.The gypsum average grain diameter is respectively 0.0368mm, 0.042mm, 0.042mm.
Table 3 embodiment 3 each layer compass screen surface desulfurated plaster quality/g
Adopt the screening plant identical with embodiment 1, agglomerated grain in the gypsum of gently pressing, crumb, and place under 45 ℃ of conditions behind the constant temperature 15h, be cooled to room temperature.Accurately weighing 35～45g gypsum is in parcel insulation material standard screen 1 top layer compass screen surface, standard screen 1 from top to bottom, pore size is followed successively by 0.075,0.063,0.053,0.045,0.037,0.030mm and bottom tray 3, covers top cover 2.Standard screen and load weighted gypsum are sieved 10min on vibrating sieving machine 4; Shake and sieve surrounding air humidity 65%; Screening is collected in each layer compass screen surface gypsum particle on the pan paper after finishing, accurate each layer of weighing compass screen surface gypsum particle quality, and parallel screening three times, measurement result is as shown in table 4.The gypsum average grain diameter is respectively 0.055mm, 0.055mm, 0.053mm.
Table 4 embodiment 4 each layer compass screen surface gypsum quality/g
Adopt the screening plant identical with embodiment 1, agglomerated grain in the gypsum of gently pressing, crumb, and place under 45 ℃ of conditions behind the constant temperature 15h, be cooled to room temperature in the drier.Accurately weighing 35～45g gypsum is in parcel insulation material standard screen top layer compass screen surface, standard screen 1 from top to bottom, pore size is followed successively by 0.075,0.063,0.053,0.045,0.037,0.030mm and bottom tray 3, covers top cover 2.Standard screen 1 and load weighted gypsum are placed preheating 50min under 50 ℃ of conditions, sieve 10min on the vibrating sieving machine 4; Shake and sieve surrounding air humidity 75%; After screening finishes standard screen 1 and gypsum samples are placed under 50 ℃ of conditions preheating 40min once more, sieve 10min on the vibrating sieving machine 4, after screening finishes; Each layer compass screen surface gypsum particle is collected on the pan paper; Accurate each layer of weighing compass screen surface gypsum quality, parallel screening three times, measurement result is as shown in table 5.The gypsum average grain diameter is respectively 0.037mm, 0.038mm, 0.039mm.
Table 5 embodiment 5 each layer compass screen surface desulfurated plaster quality/g
Claims (9)
1. the method measured of dry screening gypsum and average grain diameter is characterized in that, may further comprise the steps:
(1) agglomerated grain in the gypsum of gently pressing, crumb, constant temperature 10～15h under 45～55 ℃ of conditions;
(2) the gypsum drying is cooled to room temperature after, weighing 35～45g gypsum places preheating 40～50min under 50～55 ℃ of conditions in the top layer compass screen surface of screening plant with screening plant and load weighted gypsum, once sieves 5～10min.
(3) after screening finishes screening plant and gypsum are placed under 50～55 ℃ of conditions preheating 40～50min once more, regrading 5～10min;
(4) after regrading finishes, the collection of each layer compass screen surface gypsum particle, weighing are obtained each layer compass screen surface gypsum quality, calculate the gypsum average grain diameter with the harmonic mean particle diameter computing formula.
2. the method that dry screening gypsum according to claim 1 and average grain diameter are measured is characterized in that: said gypsum purity is more than 65%, CaCO in the gypsum
3Content is lower than 15%, and the gross mass content of other impurity is lower than 20%.
3. the method that dry screening gypsum according to claim 1 and average grain diameter are measured, it is characterized in that: described screening environment is: air humidity remains on below 75%.
4. one kind is used to realize the screening plant like the method for arbitrary described dry screening gypsum of claim 1～3 and average grain diameter measurement; It is characterized in that: described screening plant comprises several standard screens; According to the aperture from big to little, put successively from top to bottom; Additional tray under the bottom standard screen, additional top cover on the top layer standard screen; Described standard screen outer arm is enclosed with insulation material; The external vibrating sieving machine of described screening plant.
5. screening plant according to claim 4 is characterized in that: described standard screen, bottom tray and top cover are stainless steel.
6. screening plant according to claim 4 is characterized in that: described standard screen diameter is 20.5cm, high 5cm, the thick 0.5cm of described insulation material, wide 4cm.
7. screening plant according to claim 4 is characterized in that: described standard screen has 6, and the aperture of each standard screen from top to bottom is respectively 0.075,0.063,0.053,0.045,0.037,0.030mm.
8. screening plant according to claim 4 is characterized in that: described insulation material is the phenolic resins expanded material.
9. screening plant according to claim 4 is characterized in that: described vibrating sieving machine specification requirement: sieve shakes number of times: 180～250min
-1, number of times: 130～160min is hit on the top
-1
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| CN102441526B CN102441526B (en) | 2013-10-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630479A (en) * | 2013-11-15 | 2014-03-12 | 江苏大学 | Method for measuring particle number of combustion exhaust gas of engine |
| CN104296988A (en) * | 2014-10-31 | 2015-01-21 | 江西稀有稀土金属钨业集团有限公司 | Method for verifying standard sieve through laser particle size |
| CN113959888A (en) * | 2021-11-08 | 2022-01-21 | 合肥学院 | Impurity-containing detection method for quartz sand |
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| CN2574780Y (en) * | 2002-10-17 | 2003-09-24 | 关岐生 | Screen net made of porcelain screen bar |
| CN101750267A (en) * | 2009-12-23 | 2010-06-23 | 中国农业大学 | Device and method for evaluating and measuring apparent quality of micro granulated feed of aquatic animal |
| JP2010247113A (en) * | 2009-04-17 | 2010-11-04 | Taiheiyo Cement Corp | Method of treating waste gypsum board |
| CN102147349A (en) * | 2010-12-10 | 2011-08-10 | 华南理工大学 | Determination method for crushing value of fine aggregate |
| US8011606B1 (en) * | 2008-09-24 | 2011-09-06 | Chrestenson Robert A | Portable system and method for separating and recycling gypsum and non-ferrous waste discharge from a steady stream of comminuted gypsum wallboard |
| CN102179367A (en) * | 2010-12-30 | 2011-09-14 | 广东福利龙复合肥有限公司 | Screen net screening device having function of drying by heating |
-
2011
- 2011-12-08 CN CN 201110404857 patent/CN102441526B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2574780Y (en) * | 2002-10-17 | 2003-09-24 | 关岐生 | Screen net made of porcelain screen bar |
| US8011606B1 (en) * | 2008-09-24 | 2011-09-06 | Chrestenson Robert A | Portable system and method for separating and recycling gypsum and non-ferrous waste discharge from a steady stream of comminuted gypsum wallboard |
| JP2010247113A (en) * | 2009-04-17 | 2010-11-04 | Taiheiyo Cement Corp | Method of treating waste gypsum board |
| CN101750267A (en) * | 2009-12-23 | 2010-06-23 | 中国农业大学 | Device and method for evaluating and measuring apparent quality of micro granulated feed of aquatic animal |
| CN102147349A (en) * | 2010-12-10 | 2011-08-10 | 华南理工大学 | Determination method for crushing value of fine aggregate |
| CN102179367A (en) * | 2010-12-30 | 2011-09-14 | 广东福利龙复合肥有限公司 | Screen net screening device having function of drying by heating |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630479A (en) * | 2013-11-15 | 2014-03-12 | 江苏大学 | Method for measuring particle number of combustion exhaust gas of engine |
| CN103630479B (en) * | 2013-11-15 | 2015-12-09 | 江苏大学 | A kind of measuring method of engine combustion exhaust particulate number |
| CN104296988A (en) * | 2014-10-31 | 2015-01-21 | 江西稀有稀土金属钨业集团有限公司 | Method for verifying standard sieve through laser particle size |
| CN113959888A (en) * | 2021-11-08 | 2022-01-21 | 合肥学院 | Impurity-containing detection method for quartz sand |
| CN113959888B (en) * | 2021-11-08 | 2023-12-29 | 合肥学院 | Quartz sand impurity detection method |
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| CN102441526B (en) | 2013-10-23 |
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