Method for rapidly detecting mixing uniformity of powdery material

A technology of mixing uniformity and powder materials, applied in the direction of analyzing materials, instruments, etc., can solve the problems of narrow application range, poor representativeness, complicated steps, etc., and achieve the effects of rapid detection, simple operation, and strong reference value.

Inactive Publication Date: 2012-09-12
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a method for quickly detecting the mixing unifor

Method used

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  • Method for rapidly detecting mixing uniformity of powdery material
  • Method for rapidly detecting mixing uniformity of powdery material
  • Method for rapidly detecting mixing uniformity of powdery material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0044] Example one

[0045] The Al of different particle size and equal mass ratio 2 O 3 Mix the powder with NaCl powder for 30 minutes.

[0046] Step 1. Determine the properties of the mixture:

[0047] Two mixed materials Al 2 O 3 The particle size of powder and NaCl powder are 147μm and 104μm, respectively. Al 2 O 3 The mass fraction of powder and NaCl powder are both 50%;

[0048] Step two, sampling:

[0049] Randomly sample the materials that have been mixed after 30 minutes, that is, take a circle with a diameter of 5 mm from the mixed materials to take a powder sample, and then count the total number of particles contained in the circle to 7,697;

[0050] Step three, calculation:

[0051] Because it is a mixture of powders of different particle sizes,

[0052] M x =7697

[0053] C 0 =r 1 2 50%+r 2 2 50%=0.147 2 ×0.5+0.104 2 ×0.5=0.006

[0054] Calculate the deviation value

[0055] δ = | log M x - 2 log R - ( log π 4 - log C 0 ) | ...

Example Embodiment

[0058] Example two

[0059] Al with the same particle size 2 O 3 Powder mixed with powder C, Al 2 O 3 The mass ratio of powder to powder C is 1 to 2, mixing for 30 minutes.

[0060] Step 1. Determine the properties of the mixture:

[0061] The particle size of the two mixed materials is 147μm, Al 2 O 3 The mass fractions of powder and C powder are 33.3% and 66.7% respectively, and the theoretical density of each material is ρ Al2O3 Is 4.0*10 -3 g / mm 3 , Ρ c Is 2.25*10 -3 g / mm 3 ;

[0062] Step two, sampling:

[0063] Random sampling of materials that have been mixed after a period of time, that is, take a circle with a diameter of 5 mm from the mixed materials to take a powder sample, and then count the total number of particles contained in the circle to be 9,086;

[0064] Step three, calculation:

[0065] Because when mixing powders of the same particle size,

[0066] M x = 9086

[0067] m x = 4 πr 3 3 ( ρ 1 · 9086 2 + ρ 2 · 9086 2 ...

Example Embodiment

[0073] Example three

[0074] Mix sorghum rice of different particle size and equal quality with millet.

[0075] Step 1. Determine the properties of the mixture:

[0076] The particle sizes of the two mixed materials sorghum and millet are 1.6775mm and 0.67mm, respectively, and the mass fraction of sorghum and millet is 50%;

[0077] Step two, sampling:

[0078] Take a random sample of the mixed material after 3 minutes, that is, take a circle with a diameter of 14 mm from the mixed material to take a powder sample, and then count the total number of particles contained in the circle to 759;

[0079] Step three, calculation:

[0080] Because it is a mixture of powders of different particle sizes,

[0081] M x = 759

[0082] C 0 =r 1 2 50%+r 2 2 50% = 1.6775 2 ×0.5+0.67 2 ×0.5=1.631

[0083] Calculate the deviation value

[0084] δ = | log M x - 2 log R - ( log π 4 - log C 0 ) | 5 = 40 %

[0085] Step 4: Evaluation

[0086] Bec...

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Abstract

The invention discloses a method for rapidly detecting mixing uniformity of a powdery material. The method comprises the following steps of: firstly, getting all properties of materials to be mixed; then, mixing and then sampling; then, working out an offset value through calculation; then, performing evaluation according to the magnitude of the offset value; when the offset value is not greater than 10 percent, showing that the materials are evenly mixed; if the offset value is greater than 10 percent, continue mixing the materials again; and then, resampling for detection until the required offset value is reached. According to the method for rapidly detecting the mixing uniformity of the powdery material, the mixing uniformity of the material is evaluated by adopting a calculation method, and thus, the problems that the steps of a traditional method are complicated, the application scope is narrow, and meanwhile, the representativeness is poor due to the fact that samples are few can be solved. The method for rapidly detecting the mixing uniformity of the powdery material is a brand-new technology. The cost is reduced, the efficiency is increased and the product competitiveness is enhanced for enterprises.

Description

technical field [0001] The invention belongs to the technical field of powder materials, in particular to a method for quickly detecting the mixing uniformity of powder materials. Background technique [0002] The degree of material mixing is measured by uniformity. Theoretically, if one part (unit) of a substance does not differ in value from another part (unit) of a property, then the substance is completely homogeneous with respect to that property. However, in practice, if the difference between the value of one part (unit) of a property of a substance and another part (unit) of the property cannot be detected experimentally, then the substance can be regarded as homogeneous with respect to that property. [0003] At present, the commonly used techniques for evaluating mixing uniformity are: comparison method, scanning electron microscope method, mass composition method, pixel grid analysis method, and reflectance spectroscopy method. [0004] The comparison method is ...

Claims

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Application Information

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IPC IPC(8): G01N15/00
Inventor 陈文革罗启文张剑
Owner XIAN UNIV OF TECH
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