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Marble and calcite are processed by grinding, and the powders produced are called heavy calcium carbonate powder, but their application performance is quite different. The authors distinguish the two powders according to their experience in calcium carbonate production for many years. It is expected to be helpful to those engaged in the processing and application of calcium carbonate.
1, from the ore itself
The calcite's cleavage is very clear, and the light is translucent. The surface of the ore is a very clear plane. No matter how broken, the plane can be seen. Calcite is also divided into large calcite and small calcite. The clearer and more regular cleavage is the large calcite, and the large calcite has high transparency. The cleavage is a small solution, and the calcite mine has three shades, a milky white phase, a yellowish phase, and a reddish phase. The colors of the various producing areas in China vary.
The marble is divided into coarse concentrate and fine crystal ore. The color tone is the same as the whiteish white phase. The ore has a lot of domestic reserves and the amount of powder used is also very large. Basically distributed in Sichuan, Anhui, Zhejiang, Anhui, Shandong and other places. The quality of the ore varies from region to region.
From the microscopic crystal structure, calcite belongs to the hexagonal crystal system; the marble crystal is generally cubic.
2, from the calcium carbonate content and the appearance of the powder
The main components of calcite and marble are calcium carbonate. The calcite content of good calcite can reach more than 99%. The good calcium content of marble is about 96-98%. Calcite pink is softer, with a yellowish phase and a reddish color. The marble powder is slightly blue and blue, and the feeling of whiteness is darker.
3, from the difficulty of processing
Calcite has a lower Mohs hardness than marble. The hardness is about 3.0 and the hardness of the marble is 3-4. Therefore, the same power pulverizing equipment, processing calcite is much more efficient than processing marble.
4, from the powder application performance
Since the ore quality crystallization of calcite is very good, the dispersibility, fluidity, particle size distribution, and oil 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, and the better is about 93-95 (400 mesh). The two powders are played by each of the downstream customers. Their respective roles. The price of calcite powder is slightly higher than the price of marble powder. Therefore, downstream customers will choose the powder that suits their needs according to their own cost and quality requirements. The purity of calcite is extremely high, and the powder can be used in various fields of food grade, such as toothpaste, food additives, edible calcium tablets, feed additives and the like. And can pass the EU's various environmental indicators. For some high-demand enterprises, calcite powder must be the first choice. Since the calcite, whiteness, dispersibility and temperature resistance of calcite powder and marble powder are different, the downstream customers may also choose the powder according to the requirements of the product hue.
5, industry application example analysis
Plastic industry: Marble powder and calcite powder have applications, and can be used according to customer requirements.
Under the same formulation conditions, calcite and calcium heavy calcium filled with the same or similar particle size distribution will show different differences in the filling of plastic products, mainly showing excellent zebra and physical mechanics (tensile force and impact resistance). different.
a color difference:
Due to the difference in trace metals contained in calcite and marble, the color of the powder is different. The product made from calcite powder filled in plastic will be milky yellow or milky red (also known as magnetic white, milky white). ), soft color, good hiding power.
b physical mechanics differences:
Due to the different crystal structure of calcite and marble, the tensile force and impact resistance will be different after filling in plastic products. Calcite belongs to the hexagonal crystal system. The crystals are generally jujube-shaped, with large length and short diameter. The marble crystals are generally cubic in shape and have small length and short diameter. The powder with relatively long and short diameters is filled in the plastic to have a certain reinforcing effect, and the tensile properties and impact resistance of the plastic products are better. If the calcite and calcium heavy calcium of the same particle size distribution are filled with PVC pipe profiles and the like under the same formulation conditions, the products made of marble powder are more brittle and less tough than the calcite powder.