As an energy-saving, environmentally-friendly mineral material, heavy calcium carbonate is widely used in paper, plastics, rubber, paints, adhesives and adhesives due to its special physical and chemical properties. It is well known that heavy calcium carbonate is made of natural carbonate minerals such as calcite, marble, limestone, also known as ground calcium carbonate, which is a commonly used powdery inorganic filler. So, what is the difference between the heavy calcium powder processed by calcite, marble and limestone?
The chemical formula of calcite is CaCO3, and its theoretical chemical composition is: CaO 56.03%, CO2 43.97%. It is a trigonal system, colorless or white, and is sometimes dyed light yellow, light red, purple, brown, etc. When contains other elements such as iron, manganese, and copper. Natural marble is recrystallized limestone and its main component is CaCO3. Limestone softens under high temperature and high pressure and recrystallizes to form marble when the minerals are changed. The main ingredients are calcium and dolomite, which have many colors and usually have obvious patterns and many mineral particles. The Mohs hardness is between 3 and 5 and is generally cubic. The main chemical composition of limestone is CaCO3, which is represented by calcite particles. The crystal form is complex, often with a triangular facet and rhombohedron, light gray or blue-gray, Mohs hardness of 3~4, density of 2.5~2.8g/cm3.
The main components of the three are CaCO3. In comparison, the calcium content of calcite is slightly higher than that of marble and limestone. The calcium content of high-quality calcite can reach more than 99%. Calcite, marble, and limestone ore are directly ground into heavy calcium carbonate fillers. Therefore, the purity and whiteness of the ore must be extremely high, and the content of calcium oxide is almost close to the theoretical value. Not all limestone and marble can be used as raw materials for heavy calcium carbonate. It is especially important to note that limestone with high calcium content can make heavy calcium.
In the industry, it is generally not necessary to carry out mechanical beneficiation processing on the other side of the stone, only simple washing and hand selection; for limestone, it is only necessary to carry out simple washing, and does not need to be purified by a complicated beneficiation process; in contrast, the marble is rich in color. There are many types, and the processing of beneficiation is more complicated than calcite and limestone.
The Moh’s hardness of calcite is 3, which is lower than that of marble and limestone. Therefore, the same powder grinding equipment is more efficient in processing calcite than in processing marble and limestone. The ultrafine pulverization process of calcite mainly includes dry method and wet method. The dry process is generally used to produce products with d97 ≥ 3~5μm. The wet process generally uses products with d97 ≤ 3~5μm (d90 ≤ 2μm); limestone generally adopts dry pulverization process.
Calcite ultra fine grinding mill, known as HGM ultra fine grinding machine in our company, can definitely meet the common requirements of calcium carbonate related industry. More information of this calcite ultra fine grinding mill can be found on our website. If you want to discuss further with us about this equipment, you can contact us. Chatting with us online and leaving messages on our website both are welcome.
Among the three, the heavy calcium carbonate processed by calcite is the most abundant inorganic filler in the organic polymer-based materials. The ore quality of calcite is very good, and the dispersibility, fluidity, particle size distribution and powder absorption and hiding rate of the powder are better than marble. Good calcite powder whiteness can be 95-97 or more (400 mesh powder), marble whiteness is lower.
More details of the difference among the three will be shared in the next time.
