What is the effect of 325 chromite powder on the color of glass bottles?
325 chromite powder is a commonly used glass colorant, which has a significant effect on the color of glass bottles. The following is a specific analysis of its influencing mechanism and effect:
1. Coloring mechanism
The main component of 325 chromite powder is trivalent chromium (Cr³⁺). Under the action of the crystal field in the glass matrix, d-d electron transition occurs, absorbing visible light of a specific wavelength, causing the glass to appear green. This phenomenon is due to the energy level splitting of the 3d electrons of Cr³⁺ in different crystal field environments, thereby selectively absorbing certain wavelengths of light and reflecting a green spectrum.
2. Factors affecting the depth of color
a. Concentration effect
The higher the concentration of Cr³⁺, the stronger the light absorbed, and the darker the color of the glass bottle. Therefore, by adjusting the dosage of 325 chromite powder, the depth of the green glass bottle can be controlled.
b. Redox environment
During the glass melting process, the redox conditions affect the valence state of chromium, thereby changing the color. Under oxidizing conditions, Cr³⁺ is green; under reducing conditions, Cr²⁺ may appear blue. Therefore, it is necessary to control the redox environment during the melting process.
3. Practical application
Chromite flour 200 mesh, 325 mesh, 400 mesh is used as a colorant for green or brown glass bottles and ceramic glazes.
In summary, chromite powder 325 mesh directly affects the color of glass bottles through the electronic transition of Cr³⁺ ions in the crystal field. At the same time, by adjusting its concentration, redox environment, and coordination with other ingredients, precise control of the color of glass bottles can be achieved. In addition, its excellent physical and chemical properties further guarantee the color stability and product quality.