There is no fixed value for the optimal amount of chromite powder added in glass production. It varies depending on factors such as the type of glass, the depth of the required color, and the production process. The following are some common reference ranges:
Ordinary green glass: The general addition amount is about 0.1% – 0.5% (mass fraction). At this time, the glass can show a lighter green color. If a deeper green is required, the addition amount can be appropriately increased, but usually not more than 1%. For example, when producing ordinary green glass bottles, the amount of chromite powder added may be between 0.3% – 0.8% to achieve the ideal green effect.
Optical glass or special glass: For some optical glass or special glass with high requirements for color accuracy and optical performance, the amount of chromite powder added may need to be precisely controlled between 0.05% – 0.2%. Because these glasses have extremely high requirements for color uniformity and stability, a small amount of chromite powder can produce obvious color changes, and strict control is required to ensure that the optical properties of the glass are not affected.
In actual production, it takes many tests and adjustments to determine the optimal amount of chromite powder. First, we need to preliminarily determine a range of addition amounts based on the intended use and color requirements of the glass, then conduct small-scale tests on the production line to observe the color, transparency, uniformity and other indicators of the glass, adjust and optimize the addition amount based on the test results, and finally determine the most suitable addition amount. At the same time, we also need to consider that different batches of chromium ore powder may have differences in composition and purity, which will also have a certain impact on the optimal addition amount, so it is necessary to regularly test and evaluate the raw materials to ensure the stability of product quality.
