The calcium carbonate powder factory believes that heavy calcium carbonate is a calcium carbonate powder material made from raw materials such as limestone, chalk, and marble, which are mechanically crushed. It has characteristics such as a wide range of raw material sources, high whiteness, low oil absorption value, good applicability, and low price. It is currently a widely used and large-volume inorganic non-metallic mineral powder.

The calcium carbonate powder factory believes that although the main chemical components are the same as light calcium carbonate, heavy calcium carbonate has higher bulk density, smaller settling volume, smaller specific surface area, and lower oil absorption value compared to light calcium carbonate. In addition, the degree of agglomeration of heavy calcium carbonate is less than that of light calcium carbonate. Although heavy calcium carbonate can affect the shape of particles to some extent during the crushing process, it cannot control the crystal form of particles like light calcium carbonate through the carbonation process to produce products of different crystal forms. Due to the differences in the above properties, the application performance of heavy calcium carbonate and light calcium carbonate also has its own characteristics.

The calcium carbonate powder factory believes that light calcium carbonate, due to its large settling volume or low bulk density, can increase the volume of the product under the same filling amount. It has a smaller particle size, and the mechanical properties of the filler are better under the same filling amount. However, due to the large specific surface area and high oil absorption value of light calcium carbonate, it has high resistance when mixed with resin, leading to poor processing performance.

The calcium carbonate powder factory believes that under the same filling amount, heavy calcium carbonate has a smaller filler volume and higher density. Due to its smaller specific surface area and lower oil absorption value, it is easier to mix with resin. However, the types and contents of impurities in different raw materials vary, which also affects the color of the product.

The calcium carbonate powder factory believes that the indicators of heavy calcium carbonate products affect application performance.

(1) The chemical composition of heavy calcium carbonate, such as CaO, insoluble substances in hydrochloric acid, iron, manganese, and heavy metals, mainly affects the whiteness, abrasion value, color, and chemical stability of the filler material, as well as the safety of its application in toothpaste and food.

(2) The calcium carbonate powder factory believes that particle size and its distribution affect the whiteness, brightness or gloss, abrasion value, bulk density, mechanical properties (strength, elongation at break, modulus, etc.) of the filler material and its cost.

(3) The settling amount or filler density mainly affects the density of the filler.

(4) Whiteness mainly affects the color and brightness of the product.

(5) The calcium carbonate powder factory believes that the oil absorption value affects the dispersibility of ground calcium carbonate in the filler material or product and the processing performance (difficulty of mixing) of the filled resin system, while also affecting the dispersion stability or settling performance of coatings and inks.

(6) Moisture content mainly affects the apparent performance of the filler material or product. Excessive moisture content not only affects the surface modification effect but may also change the apparent quality of the filler material or product.

(7) The calcium carbonate powder factory believes that surface activity or activation degree mainly affects the dispersibility of ground calcium carbonate in resin and its interaction with the polymer matrix, thereby affecting the mechanical properties, aging resistance, and apparent performance of the filler material or products.

(8) Specific surface area mainly affects the oil absorption value of ground calcium carbonate.

(9) The calcium carbonate powder factory believes that pH mainly represents the acidity and alkalinity of heavy calcium carbonate products and is one of the main factors affecting the chemical stability of filler materials or products.