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How know my materials has been adequately mixed well

Author：admin │ Published：2024-12-16　

The powder mixings:
Powder mixing is the process of mixing two or more components in a dry state or in the presence of a small amount of liquid, using external force to continuously reduce their heterogeneity. The so-called two or more components can be different substances or the same substance with different physical properties, such as different moisture content, particle diameter, color, etc. Powder mixing is a complex stochastic process, and the evaluation and determination methods of mixing quality have always been a thorny issue that troubles people. With the development of the times, the days of judging the uniformity of mixing based on human facial senses have passed. The quantitative analysis of powder mixing is the use of scientific and quantitative methods to determine the uniformity of the mixture. To achieve quantitative analysis, there must be several processes including sampling, testing, and statistical analysis (data processing), in order to obtain a single value to express the uniformity of the mixture.

The detection procedure for mixing uniformity is as follows:

1). Sampling refers to taking a small amount of material from a certain location in a mixture, called "sampling". This small amount of material is called "observation sample" or "point sample", and the sampling location is called the "sampling point". Samples taken from different sampling points in the same container at the same time level constitute the "sample" at this time level. The number of sample points is the size of the sample. Regarding the size of the sample: The smaller the sample, the better, provided that it meets the testing requirements and may be representative of the surrounding materials at the sampling point. Samples that are too large not only waste materials, but also have a negative impact on the accuracy of quantitative analysis. Regarding the number of samples (i.e. sample size): The more samples, the larger the sample size, the more reliable the quantitative analysis results, and the smaller the error rate. But so far, the optimal number of samples has not been determined. According to the recommendation of the American Chemical Engineering Association, it is required to have 5-15 samples, while some believe that at least 20 or even 50 samples are needed. It is customary in our country to take 5-10 samples. Regarding the location of sampling points, when sampling materials in a stationary state, the sampling points should be evenly distributed throughout the material as much as possible. If samples can be taken in the moving flow of the mixture, the analysis results obtained are more accurate than those obtained by sampling in a stationary state. So, if conditions permit (such as when the optimal mixing time has been determined), it is better to take samples from the outlet logistics of the mixer.

2). The detection will obtain samples and use chemical or physical methods to determine the content of each component (especially the key component - tracer): X. If the number of samples is 5, then 5 results will be detected: X1；X2； X3；X4； X5. Regarding the detection method, it should be determined by the properties of the components, the purpose of mixing, and the actual conditions.

3). Statistical analysis uses statistical methods to calculate the above test results and obtain a single value to evaluate the quality of the mixture.

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