How does ultrafine calcium carbonate powder enhance whiteness?
How does ultrafine calcium carbonate powder enhance whiteness?
Whiteness is an important physical and chemical property of ultrafine calcium carbonate powder; the higher the whiteness, the better the quality. To ensure that ultrafine calcium carbonate powder meets the requirements of industrial production, manufacturers must undertake the following measures to enhance the product’s whiteness.
1. Strengthen management and upgrade equipment: When it comes to calcium carbonate production equipment, you get what you pay for; manufacturers should strive to procure high-quality equipment and jointly enhance equipment inspection and maintenance.
2. Carefully select the raw ore and analyze whether the iron content exceeds the limit; typically, the Fe₂O₃ content should be ≤0.1%. If it exceeds 0.2%, the product may turn yellow or even red, resulting in a decrease in whiteness. In such cases, chemical reagents must be used for iron removal. If the iron contamination is caused by equipment, the same method can also be applied. However, if the iron content is within the acceptable range, this method should not be used, as it could reduce the whiteness.
3. Analyze the chemical composition of calcite and its products; if other impurities in the ore are present in excessive amounts, the whiteness will also be lower. In such cases, multi-stage desliming and impurity removal should be employed to maximize whiteness as much as possible. However, given the inherent limitations of this approach, it is often necessary to switch to a different ore. If the ore contains a high proportion of colored minerals, bleaching techniques should be applied to enhance the product’s whiteness. The whiteness of calcium carbonate is influenced by both the production equipment and the quality of the raw ore; therefore, effective measures can be implemented during production to improve whiteness by optimizing these two factors. Alternatively, reductive bleaching, oxidative bleaching, or a combination of both may be used to bleach the product.
Introduction to the Production Process of Ultrafine Calcium Carbonate Powder
Ultrafine calcium carbonate powder is classified according to particle diameter; to produce such a product, manufacturers must employ the corresponding production processes. So, as of now, are there any better methods?
1. One production method involves using the waste secondary salt sludge from the ammonia-soda process for producing soda ash to prepare ultrafine calcium carbonate powder.
2. Taking into account production costs, energy consumption, environmental protection, and other factors, a two-step lime–soda ash brine purification process is adopted. In this process, magnesium and calcium ions in the brine directly react with lime milk and soda ash solution to produce calcium carbonate. Most of the calcium ions in the calcium carbonate are derived from the conversion of magnesium ions through reaction with lime milk, resulting in highly pure calcium ions free of other impurities and a product with low impurity content.
3. The production process employed by manufacturers of ultrafine calcium carbonate powder is based on chemical reactions among ions, involving minimal equipment and a straightforward process flow. Consequently, the likelihood of iron ions being introduced into the equipment or piping is lower than in other production methods, resulting in products with reduced iron content and higher whiteness. Moreover, the production of ultrafine calcium carbonate places great emphasis on resource utilization; in line with societal calls to reduce energy consumption, manufacturers are continuously refining their processes, enhancing resource efficiency, and moving toward environmentally friendly and sustainable practices.
That concludes our explanation. Does everyone understand? If you’d like to learn more, please don’t hesitate to contact us. Thank you for watching, and we’ll see you in the next episode.
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