Introduction: China has abundant calcium carbonate resources. In recent years, deep processing of calcium carbonate has developed rapidly. The vertical mill has been successfully used to grind ultrafine heavy calcium carbonate, which has the characteristics of low energy consumption and high efficiency. However, the grinding of ultrafine calcium by a vertical mill requires reasonable grinding conditions. What are the process conditions? The rough processing of heavy calcium carbonate is mainly the use of Raymond mill, and the finished product has a particle size of 200-400 mesh. So what about its ultrafine processing equipment? If the gas mill is used, when the feed size is 400 mesh, the average particle size after three times of pulverization is 2μm, wherein -2μm is 49.5%. If ultrafine grinding is used for grinding of heavy calcium, the product is fine. Degrees up to -2 & mu; m accounted for 80% -90%, but need multiple stages of grinding to achieve fineness requirements, high energy consumption. After years of research and development, our company Industrial Technology Group Co., Ltd. has introduced a vertical mill to grind the effect of ultrafine heavy calcium carbonate. Now take the heavy calcium carbonate plant of our company, a Hunan customer, to demonstrate with the actual production case of our company's vertical mill and explore reasonable grinding conditions.
In the case of a vertical mill, the speed is an important factor affecting its efficiency. The faster the rotation speed, the higher the friction probability between the vertical mill media, and the higher the grinding efficiency. However, if the vertical mill speed is too high, the grinding medium is easy to be removed, and the grinding efficiency cannot be improved, so it is necessary to select a suitable rotation speed.
Second, the effect of the concentration of heavy calcium carbonate on the grinding effect of the grinding of ultrafine calcium by the vertical mill
First, the other conditions are limited. When the concentration is 30%, the grinding fineness is 86.2%; when the grinding concentration is 60%, the grinding fineness is 84.1%. It can be seen that the grinding concentration also has a certain influence on the grinding effect. We generally choose high concentration in the preparation of heavy calcium carbonate, because the heavy calcium carbonate has good wettability and little viscosity. Even if it is formulated to a concentration of 60% to 70%, its fluidity is still very good, and the product is generally not Need to be filtered and used directly.
Generally, the amount of medium increases, and the grinding efficiency increases. However, after the amount of medium increases to a certain height, the fineness of grinding is no longer increased. For example, when the amount of medium is 25 kg, the fineness of grinding is -2 & mu; m is 80.2%, and when the amount of medium is 40 kg, the fineness of grinding is -2 & mu; m 84.1%.
The influence of the production capacity and energy consumption of the vertical mill on the grinding effect of the grinding of ultrafine calcium by the vertical mill
The user uses our company's vertical mill. When the grinding mill size - 325 mesh accounts for 88.6%, the grinding concentration is 65%, the product fineness & ge; -2 & mu; m90%, the vertical mill's production capacity is 168kg / h, total energy consumption 9.3kW?h/h. Compared with other fine grinding equipment, the advantages of our company's vertical mills with high productivity and low energy consumption are self-evident. The advantages of our company's vertical mill in the deep processing of heavy calcium carbonate are self-evident. In addition, in addition to selecting high-efficiency and low-energy vertical mill equipment, we must also learn the grinding speed, concentration, grinding aid, medium amount and other grinding. Process conditions for higher ore milling efficiency. Welcome to consult our company's customer service.