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2022-04-20 15:59:45 Micro Powder Technology
The papermaking industry is one of the largest markets for calcium carbonate. With the development of papermaking technology, the papermaking process has changed from acidic papermaking to neutral and alkaline papermaking, and the amount of calcium carbonate in the papermaking industry has greatly increased. Especially in recent years, my country's traditional paper industry is undergoing structural adjustment and product transformation and upgrading. As an indispensable and important white inorganic filler and pigment in the paper industry, calcium carbonate is increasingly playing its unique and important role.
At present, large-scale papermaking calcium carbonate production enterprises at home and abroad mostly use wet grinding to prepare heavy calcium carbonate, and directly pump the calcium carbonate slurry to paper mills through pipelines. The quality of the calcium carbonate slurry has a significant impact on paper quality and production operations.
As a paper filler, calcium carbonate can improve the optical properties of paper products, the smoothness of paper, the forming of paper sheets, the printing adaptability and writing adaptability of products, and because its cost is much lower than that of pulp fibers, it can significantly reduce production costs. Therefore, calcium carbonate occupies a crucial position in the field of papermaking.
The heavy calcium carbonate used in the wet end of papermaking must meet the following requirements: high whiteness, high purity, stable particle size and distribution, low hydrochloric acid insoluble content and abrasion, slow sedimentation performance, etc. These index requirements are closely related to the stability of the wet end production process of the paper machine and the control of the paper quality index.
The standard control for calcium carbonate whiteness is ≥90%.
The control standard for calcium carbonate content on the filler is ≥98%.
The particle size control range is -2μm content 65%, -45μm content 100%.
The products produced by our calcium carbonate ultra-fine wet grinding equipment and process have excellent characteristics: paper whiteness, nap strength and ink absorption will be improved, smoothness, gloss, stiffness, folding resistance Indicators such as degree and opacity will be improved to varying degrees. The pulp calcium produced by the company's technology and equipment has reached the international quality standard produced by OMYA.
| Product physical index | Calcium carbonate product characteristics of wet grinding equipment | |
|---|---|---|
| particle surface shape | The equipment is large in size, the amount of grinding media added, and multiple units are produced in series, the particles stay in the body for a long time, the particles are uniform, and the surface is smooth, observed under a microscope, it is uniform and spherical, which improves product wear and improves product flow. Sex and Rheology. | |
| Solid content/Solids(%) | High solid content, can reach more than 76%. | |
| Viscosity/Viscosity(mPas) | Low viscosity, stable viscosity, small back viscosity difference, especially long-term storage viscosity will not change greatly. | |
| particle settling | Because the particles are uniform, the solid content is high, the viscosity is well controlled, and the particle sedimentation is less. | |
| particle size | <1m | The particle size distribution is uniform, the shape of the particle size distribution graph is good, and the large particles are few. |
| <2m | ||
| Residue | >45m(Wet Sieving) | Very little residue of large particles in the product improves product attrition, reduces settling, and improves product flow and rheology. |
| Foreign body residue | Foreign matter in the product is fully excluded, such as free carbon, grinding media debris, etc., so as not to affect the whiteness and wear of the product. | |
| pH | The dispersant is automatically added, and the pH value can be controlled within a stable range. | |
| Whiteness/Brightness | The particle surface is uniform and smooth, the light reflection is uniform, the whiteness is high, and the color difference is small. | |
| Abrasion/Abrasion | Because the particles are uniform, the surface of the particles is smooth, the 45m residue is less, and the foreign matter in the product is fully excluded, so the product wear is low. | |
| Acid insoluble matter/AIR | Foreign matter in the product is fully excluded, such as free carbon, grinding media debris, etc., so the acid insoluble matter is low. | |
The equipments of our company are imported professional calcium carbonate ultrafine wet grinding equipment with advanced equipment and excellent quality.
The company's production process design is the current international advanced level of calcium carbonate ultra-fine wet grinding process, and the entire production process is fully automated.
SBM Ultrafine Powder Technology has senior paper-making professionals who are dedicated to the research of paper-making calcium carbonate grinding equipment, technology and product application. It can provide all kinds of ultrafine powder processing plants and large paper mills with a full range of services from scheme production, complete equipment production, installation and commissioning, and product application. Especially from crushing, dry, wet grinding in large paper mills have very rich experience. For a long time, he has been committed to the research and improvement of the ultrafine wet grinding process of calcium carbonate for papermaking, and has been committed to the extension research of the application of calcium carbonate in various types of paper.
The advanced DCS control system is used for automatic control to ensure the stability of product quality. Especially suitable for high-quality calcium carbonate grinding in large paper mills. Stones less than 5mm or 325 mesh dry powder are metered and enter into the grinding chamber from the upper part of the mill in a certain proportion with water. There is a whole multi-dimensional cyclic movement and rotation movement in the cylinder. The material is effectively crushed under the action of friction, extrusion, shearing, soft rubbing and impact force generated by the weight pressure of the smooth-surfaced medium ball and the rotating centrifugal pressure.
During the operation of the mill, the qualified materials are filtered out from the screen with only 0.15MM gap, and the coarser particles remain in the mill to continue grinding. The agitator made of hard alloy called "high chromium alloy" in industrial teeth greatly reduces the loss of grinding disc and medium ball, has no effect on the whiteness of the slurry, and does not change the characteristics of the material.
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