About the meaning of powder mixing and the detection of mixing uniformity.
The meaning of powder mixing: Powder mixing is a process in which two or more components are mixed by external force in a dry state or in the presence of a small amount of liquid to continuously reduce their heterogeneity. The so-called two or more components can be different substances, or they can be the same substance with different physical properties: such as different moisture content, different particle diameters, different colors, etc. Powder mixing is a complex random process, and the evaluation and measurement methods of mixing quality have always been a thorny issue that has troubled people.
The testing procedure for mixing uniformity is as follows:
1. Sampling: Taking out a small amount of material from a certain position in the mixture is called "sampling". This small amount of material is called "observation sample", also known as "point sample", and the sampling location is called "sampling point". In the same container, at the same time level, samples taken from different sampling points constitute the "samples" at this time level.
2. Testing: Samples will be obtained and the content of each component will be determined using chemical or physical methods: X.
3. Statistical analysis: The above test results are calculated using statistical methods to obtain a single value to evaluate the mixing quality of the mixture, which is called statistical analysis.
1. Arithmetic mean, also known as sample mean.
2. Relative standard deviation, also known as RSD.
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