Method for determining the original grain size of pseudo boehmite in Yangzhou Zhongtianli

Pseudo boehmite can meet the requirements of uniform dispersion of oxygen source and reaction mixing, and is the primary choice of aluminum source for experiments. So what is the method for determining the original grain size of pseudo boehmite? Today, Yangzhou Zhongtianli will share with everyone and take a look together

1. Grinding method

Earlier, when Alcoa's peers came to China, they mentioned this method. Measure the particle size distribution and median diameter D50 of the crushed material using a particle size analyzer at a specific volume, with a certain material to ball ratio and a fixed grinding time, and use this method to achieve macroscopic control.

2. X-ray diffraction method

The main method is the spectral linewidth method, which can measure the particle size of pseudo boehmite, but the diffraction lines of A aluminum oxide powder series products are narrow and sharp. The experiment shows that there is no "money effect", and even due to the influence of mineralizers, the intensity of the diffraction peak is inconsistent with the JCPDS card, further affecting the accuracy of quantitative analysis of alumina.

Pseudo boehmite can meet the requirements of uniform dispersion of oxygen source and reaction mixing, and is the primary choice of aluminum source for experiments. So what is the method for determining the original grain size of pseudo boehmite? Today, Yangzhou Zhongtianli will share with everyone and take a look together

3. Nitrogen adsorption small specific surface method

Suitable for porous active materials, but due to the dense nature of sintered A alumina powder obtained at high temperatures, with few open and closed pores, it is difficult for liquid nitrogen molecules to enter the intergranular gap. Therefore, the measurement range is limited, and the measurement error of grain size is large. The principle of this method limits its industrial application value.

4. Electron microscopy method

The method of combining chemical corrosion with scanning electron microscopy to measure grain size is intuitive and reliable, and is an effective way to reflect the shape and size of grains, but requires a large amount of equipment and analysis.

5. Infrared spectral structural analysis method

Due to the fact that the size of the spectral absorption band is related to the grain size, an absorption band area integrator can be introduced into the structure of an infrared spectrometer to calculate the average grain size. The supply amount analyzed using this method is very small, and it is still objectively difficult to obtain representative samples for samples with a wide particle size distribution range.

Considering the requirement of uniform dispersion of the reaction mixture, the added aluminum source can dissolve in weak or medium strength acid solutions. The above is the content related to the proposed boehmite shared by Yangzhou Zhongtianli. I hope the above content is helpful to you.

Friends who want to purchase boehmite are welcome to contact us. Yangzhou Zhongtianli has production bases in Yangzhou, Luoyang, and Hebi, totaling over 250 acres, with an annual production capacity of 1500 tons; 8 modern production lines, equipped with complete testing equipment such as synthesis, hydrolysis, sintering, and laser particle size analyzer; Large stock reserves, fast delivery, and cooperation with major brand logistics companies for door-to-door delivery.