There Are Eight Important Indicators In Heavy Calcium Carbonate


1. Whiteness: Whiteness is mainly related to the origin of calcium carbonate ore, the composition of the ore, and the type of ore. Generally speaking, the higher the whiteness, the higher the calcium carbonate content. The whiteness mainly affects the whiteness, gloss and colorability of plastic products. There is also a hue problem in whiteness. Because calcium carbonate ore contains some other elements, the hue of calcium carbonate from different places of production also has certain differences, mainly including reddish, bluish, and yellowish. Hue.

2. Particle Size And Particle Size Distribution: particle size mainly refers to the size of the particles. Particle size distribution refers to the ratio of particles of various sizes to the total number of particles in a powder sample. We often use "mesh" to indicate the fineness of the powder, and the corresponding particle size is represented by D97, but a single D97 is not enough to represent the characteristics of the fineness of the powder, and a complete particle size distribution should be used The graph can characterize the characteristics of fineness. In plastic products, the narrower the calcium carbonate particle size distribution, the more stable the processing industry and product quality; the wider the particle size distribution, the more difficult it is to process and the unstable product quality.

3. Specific Surface Area: The specific surface area of a powder sample refers to the sum of the surface area of all particles per unit mass of the sample. Generally speaking, the finer the fineness, the larger the specific surface area, but the content of coarse powder and fine powder needs to be considered. If the fine powder content is high, but the D97 value is large, the fineness will be large and the specific surface area will be large. At the same time, when determining the specific surface area, you also need to consider the particle surface morphology and whether the particle is a solid body. If the particle surface has more pores or the surface has depressions, the measured specific surface area is also too large. Generally, the larger the specific surface area, the higher the gloss of the product, but its dispersibility is also more difficult.

4. Oil Absorption: Oil absorption refers to the maximum amount of dioctyl phthalate (DOP) absorbed by 100g of powder. In processing applications, it is hoped that the lower the oil absorption, the better. The lower the oil absorption, the less the amount of plasticizer absorbed and the lower the cost. Generally, the finer the powder particles, the greater the oil absorption.

5. False Specific Gravity: false specific gravity is usually also called bulk density or loose density. In a sense, false specific gravity also reflects the fineness of the powder. It is combined with D97, specific surface area, and particle size distribution to consider the powder. An important indicator of body fineness.

6. Particle Morphology: Due to the difference in processing equipment and the origin of the original mineral, the crystal type of heavy calcium carbonate is usually divided into multiple particles, such as multi-cube, flat, cuboid, long rod, near sphere and irregular shape. shape. Multi-cube, cuboid-shaped calcium carbonate has good fluidity in the processing of plastic products, and is easy to be coated and cross-linked by coupling agents. The processing equipment is less worn, but the mechanical properties of the product are relatively reduced; the particle ratio of flat and long rods The surface area is relatively large, if surface treatment is done, the coupling dose will increase, but the mechanical properties of the product will be better.

7. Surface Treatment Heavy Calcium Activation Degree: Surface treatment heavy calcium is also called active heavy calcium. In order to improve the bond with the matrix material and improve its dispersibility, it is necessary to perform active treatment on it. For heavy calcium manufacturers, surface treatment of calcium carbonate is an important channel for deep processing of products, which can increase the added value of products and obtain better economic benefits. But for activated calcium carbonate, not all downstream customers need to use activated calcium carbonate. Secondly, the active treatment of heavy calcium is usually realized by physical coating or chemical mechanical modification. The principle and process are different from the production process of light calcium. Anti-cohesion treatment for carbonization. In order to characterize the effect of heavy calcium activation treatment, we often use the index of activation degree to reflect its surface treatment effect.

8. Impurity Element Content: The impurity element content usually refers to the content of other elements in the ore except calcium carbonate. The main impurity elements are mainly silicon, magnesium, aluminum, iron, and manganese. Other lead, cadmium, and chromium are classified as harmful heavy metal elements. Usually impurity elements are in the form of oxides or in the form of several complex associated minerals such as carbonate, sulfate, silicate, etc. Therefore, when downstream customers are processing and applying, they should understand the form of their impurities. Some impurity elements Existence will improve processing performance and product performance, and the presence of some impurities is detrimental to processed products.

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