CN102441526B - Dry sieved material, and average particle size measuring method and sieving device thereof - Google Patents
Dry sieved material, and average particle size measuring method and sieving device thereof Download PDFInfo
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- CN102441526B CN102441526B CN 201110404857 CN201110404857A CN102441526B CN 102441526 B CN102441526 B CN 102441526B CN 201110404857 CN201110404857 CN 201110404857 CN 201110404857 A CN201110404857 A CN 201110404857A CN 102441526 B CN102441526 B CN 102441526B
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Abstract
The invention discloses dry sieved gypsum and an average particle size measuring method thereof. The average particle size measuring method comprises the following steps of: accurately weighing dried desulfurization gypsum on the top layer sieving face of a standard sieve; after a top cover is covered and the standard sieve and the gypsum are pre-heated for 40 to 50 minutes at the temperature of 50 to 55 DEG C, sieving the gypsum for 5 to 10 minutes on a sieve shaker; after sieving, preheating the standard sieve and the gypsum again for 40 to 50 minutes, shaking the sieve for 5 to 10 minutes;and accurately weighing gypsum particles on each layer of sieving face, and calculating the average particle size of the gypsum. The invention also discloses a sieving device for the method. The method and the device have the characteristics of simpleness, high practicability, high speed, accuracy and the like and are also applied to the sieving and the measurement of the average particle size ofmaterials of which the particle sizes are 1 to 100 mu m, wherein the materials are easy to wet.
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, the method also is adapted to other moisture-sensitive simultaneously, and particle size range is measured in screening and the average grain diameter thereof of 1～100 μ m material.
Background technology
In the experimental study and production practices of the various fields such as chemical industry, material, environmental protection, the distribution of grain diameter all has great significance with measurement.The method of measuring at present particle size distribution mainly contains sedimentation, sieve method, microscopic method and laser scattering method etc., wherein microscopic method and laser scattering method measurement particle size range is less, accuracy is higher, but because apparatus expensive is unfavorable for that manufacturing enterprise uses.The gypsum main component is calcium sulfate, 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 affect the major parameter that gypsum extensively utilizes generally at 10～80 μ m.Owing to being exposed in the air, gypsum easily absorbs the moisture in air reunion of making moist, cause relatively difficulty of dry screening, measure the method that the gypsum particle diameter generally adopts sedimentation or wet sieving in the industrial production, but sedimentation requires particle profile rule, and is larger 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 affects accuracy of measurement results.
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-again preheating-again screening " simultaneously method of standard screen outer wall parcel insulation material, indoor realization in drying is effectively sieved gypsum, can obtain the 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 as follows:
(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 as follows: 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 placed under 50～55 ℃ of conditions again preheating 40～50min, 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 described 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 be used to realizing above-mentioned dry screening gypsum and average grain diameter measuring method thereof comprises several standard screens, according to the aperture from large 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, 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 Foaming of phenolic resin material.
That the inventive method has is simple to operate, quick and precisely wait characteristics.Owing to having adopted the front method to gypsum and standard screen preheating and standard screen outer wall parcel insulation material of screening, can guarantee that gypsum can be because of absorbing airborne moisture reunion and can not passing through sieve aperture; Adopt simultaneously the method for twice screening of twice preheating, reduce experimental error, make size data more accurate.Screening plant of the present invention is simple in structure in addition, safety, and is reasonable in design, and 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 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 laser fineness gage.
Fig. 3 screening plant structure diagram.
The specific embodiment
The invention will be further described below in conjunction with the specific embodiment, is not the restriction to protection domain.Gypsum purity is 92%, CaCO in this specific embodiment
3Content 1%, other impurity contents 7%.For avoiding repeating, below repeat no more among each embodiment.
A kind of screening plant for realizing 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 large 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 Foaming of phenolic resin material as insulation material, the thick 0.5cm of insulation material, wide 4cm.The external vibrating sieving machine 4 of described screening plant.
Embodiment 1
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 placed under 50 ℃ of conditions again preheating 40min, 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 placed under 50 ℃ of conditions again preheating 40min, 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
Embodiment 5
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 placed under 50 ℃ of conditions again preheating 40min, 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 (2)
1. the method measured of a 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 placed under 50～55 ℃ of conditions again preheating 40～50min, 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;
Described 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%;
Described screening environment is: air humidity remains on below 75%.
2. the screening plant of a method that is used for realizing that dry screening gypsum as claimed in claim 1 and average grain diameter are measured, it is characterized in that: described screening plant comprises several standard screens, according to the aperture from large 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; Described standard screen, bottom tray and top cover are stainless steel; Described standard screen diameter is 20.5cm, high 5cm, the thick 0.5cm of described insulation material, wide 4cm; 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 is the Foaming of phenolic resin material; Sieve shakes number of times: 180～250min
-1, number of times: 130～160min is hit on the top
-1
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| CN103630479B (en) * | 2013-11-15 | 2015-12-09 | 江苏大学 | A kind of measuring method of engine combustion exhaust particulate number |
| CN104296988B (en) * | 2014-10-31 | 2018-04-06 | 江西江钨浩运科技有限公司 | A kind of method of laser particle size verification standard screen |
| CN113959888B (en) * | 2021-11-08 | 2023-12-29 | 合肥学院 | Quartz sand impurity detection method |
Citations (4)
| 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 |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| 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 |
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| JP特开2010-247113A 2010.11.04 |
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