The rapid development of the domestic ceramic industry, especially in construction ceramics industry, large enterprises are emerging. In order to reduce energy consumption to improve the utilization of land area, the business productivity of equipment and energy requirements are raised high, so low labor intensity, the continuous production of large ball mill is widely used. According to Henan Bailing Machinery Co., Ltd personnel, the construction ceramics industry, due to continuous wet ball mill with production, low energy consumption, small area, high degree of automation, low labor intensity, less environmental pollution, etc., Application of continuous wet ball mill will achieve unprecedented success.
However, due to the physical properties of ceramic materials, wet ball mill in a continuous application of rubber extruder must address the following issues:
1, how to achieve a continuous feed of materials, and to ensure uniformity of slurry composition.In the domestic cement industry, continuous wet ball mill have been widely used, but its up to more than four kinds of raw materials, slightly higher moisture content of clay only about 10% of the raw material, after drying or natural drying can be slightly into the silo, and silo, and the number of ingredients that are less easy to implement computer ingredients, but use the cement industry, the proportioning system of the assumption that all the raw materials must be dry. In fact, in the early 90s, foreign to the successful construction ceramics industry in the introduction of continuous ball mill, and was widely accepted. However, ceramic materials, a wide range of domestic buildings, subject to regional-impact,
Therefore, copying the system of foreign ingredients and not be bound to cause people to accept high costs, resulting so far in the domestic ceramic industry, and the ball mill is still blank. The author is the raw material for domestic regional characteristics of the different processes carried out by design. At present, the domestic construction ceramics porcelain mainly concentrated in Guangdong, Foshan district, Zibo, Shandong, Fujian Jinjiang, Sichuan Jiajiang.
Ingredients low cost, high degree of automation is the most suitable areas for continuous porcelain ball mill. Because the material is not hard to wear the same extent, in order to ensure uniformity of slurry, the same will be milled out of all the introduction of pulp slurry pond. Although the beginning of material into and out of non-identical, but because of conservation of mass, after mixed into a slurry tank slurry evenly to completely ensure the prescription requirement.
2, how to ensure reasonable so that the impact of grinding media and grinding of the materials separated from the role, ball out of the slurry particles can meet the technical requirements.
To meet this requirement, mainly from three aspects to consider:
1) sub-warehouse and cylinder tube length:Intermittent ball mill grinding body in the impact and grinding of materials is at the same time, when the material to a certain fineness of grinding, the material on the grinding media have a certain cushion, which reduces the impact of grinding media on the material, and is likely to result over-lapping of materials. And continuous systems where the impact of grinding media and grinding of materials is carried out separately (see Figure 1 can be the work of schematic diagram).
2) Partitioning
Because the characteristics of ceramic raw materials, compartment plate design is also very critical. Author, based on the domestic cement industry continuous wet ball mill used Partitioning and cement and ceramic raw materials, research, and design the ceramic industry, and the ball mill with a compartment plate.
Ceramic raw materials, cement raw material is relatively hard to grind big factor, but required slurry fineness but also much more detailed. Fineness of the slurry, the cement industry demand is less than 100 mesh sieve over 7%, while the ceramic industry is off more than 250 mesh is less than 3%, which will require that materials in the ball mill to a long residence time . To this end, continuous ball mill in terms of relative cement, ceramic industry, and the ball mill in the sub-storage laws, tube length and the positions and the positions of the compartment between the plate structures are different (see Figure 2). From the photos 2 (b) can be seen in the ceramic plate with a compartment design, only when the slurry particles can be suspended in grinding to A 'side more,
To the transition through the grate holes cavity plate through Jan unload the material to the next warehouse. Thus, the material in the tube body stay lengthened, and to some extent able to control its size to achieve the required slurry.
3) The liner and grinding media:Liner is used to protect the cylinder, so that from the grinding media and material cylinder direct impact and friction. Different forms of liner body can also change the ground state of motion in the cylinder body. (Such as into the falling, down) while the effect of grinding mill grinding body by the impact and grinding of materials is achieved. View from the grinding process, the storage requirements of the motion state of grinding body is different. Into the mill have a larger storage of materials grain size, which requires the impact of grinding media have sufficient capacity, and so the subsequent storage of materials grain size decreases, the grinding media on the role of main abrasive materials. Cylinder speed in certain circumstances,Only the warehouses lining the surface made of different shapes, and then under the impact and grinding mechanism equipped with different sizes of grinding media. Liner and grinding media to produce different friction coefficients, to change the ground state of body movement, thereby enhancing the grinding efficiency. Lining and wear resistance of abrasive material should be selected larger proportion of good rubber and aluminum ball stone.
3, the addition of grinding aids: how to improve the efficiency of grinding ball mill grinding aid even into the inside.As the material is continuously into ball mill for grinding of materials the highest efficiency of grinding aids must also be evenly into a continuous mill. To make grinding aids to evenly into the ball straight, we access a lot of information, done a lot of experiments, consulting a number of manufacturers, found that most manufacturers use the grinding aid, whether powder or agent, can be dissolved in water. Therefore, soluble in water by grinding aid measures, first quantitative grinding aids added to the quantitative tank, mixing with a blender full uniform, each with a good solution when a case of grinding aids, it will put them in another tank work ,Aqueous solution with a metering pump Grinding evenly from the tank into the ball mill work,thereby improving the efficiency of milling.
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