• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE535290C2
    申请号:SE1150426
    申请日:2011-05-12
    公开日:2012-06-19
    发明作者:Vladimir Ronin
    申请人:Procedo Entpr Etablissement；
    IPC主号:
    专利说明:

    20 25 535 290 The mill has a grinding chamber with a wall at both ends of the chamber. An inlet opening for materials to be treated is located in the upper part of the chamber. At the opposite end of the chamber there is an outlet opening in the lower part of the chamber. Inside the chamber at the end where the outlet opening is located, there is a wall provided with openings which allow the passage of sufficiently ground material which, after passing the wall provided with openings, falls down towards the outlet opening.
    Approximately in the middle of the chamber and in its upper part there is an impermeable wall, which prevents material from being transported directly from the inlet opening through the upper part of the mill to the wall provided with openings and through this to the outlet opening, which, in combination with the above-mentioned relationship length to diameter, would lead to a very short residence time in the mill. However, this impermeable wall is subject to extensive abrasion of the grinding bodies, so it must be replaced approximately every three days. This of course leads to downtime and thus costs.
    The present invention solves this problem.
    The present invention thus relates to a vibration mill primarily for treating cement and fly ash, which mill has a grinding chamber with a wall at both ends of the chamber, which mill comprises an inlet opening for material to be treated and an outlet opening for the rear wall of the grinding chamber, at the lower part of the grinding chamber, and a first wall inside the chamber at the end where the outlet opening is located, which wall is provided with one or more openings in its upper part, which allows passage of sufficiently ground material from the grinding chamber to the outlet opening. The invention is characterized in that the inlet opening is located in the lower part of the grinding chamber at the wall opposite to which the outlet opening is located.
    The present invention is described below, partly in connection with an exemplary embodiment of the invention shown in the accompanying drawing, in which - figure 1 shows a cross section of a grinding chamber.
    In Figure 1, the number 1 denotes a grinding chamber, the number 2 an inlet opening, the number 4 the number 3 an outlet opening, a central pipe, the number 5 a wall for retaining grinding bodies, the number 6 the front wall of the grinding chamber and the number 7 the rear wall of the grinding chamber. The number 8 denotes an opening in the wall denoted 5.
    Figure 1 shows a vibration grinder mainly for treating cement and fly ash, which grinder has a grinding chamber 1 with a wall 6, 7 at both ends of the chamber, which grinder comprises an inlet opening 2 for material to be treated and an outlet opening 3 at the rear of the grinding chamber wall 7, at the lower part of the grinding chamber. A first wall 5 is located inside the chamber at the end where the outlet opening 3 is located, which wall is provided with one or more openings 8 in its upper part. The openings allow the passage of sufficiently ground material from the grinding chamber 1 to the outlet opening 3.
    According to the invention, the inlet opening 2 is located in the lower part of the grinding chamber 1 at the wall 6, which is opposite to where the outlet opening 3 is located, the grinding chamber 1 is cylindrical. In the central tube 4 runs a driven shaft (not shown), which performs an eccentric movement, so that the drum vibrates without rotating. The eccentric movement 1035 20 is conventionally effected in that the shaft passing through the tube 4 is provided with weights outside the grinding chamber, which weights are asymmetrically placed on the shaft.
    In the grinding chamber there are conventional grinding bodies. The grinding bodies can be cylindrical with a length of 5 - 7 cm of metal, which grinds down the material to be ground. and with a diameter of 1 - 3 cm. During grinding, the material to be ground is exposed to many strong shocks from the grinding bodies, which increases the chemical reactivity of the material.
    Due to the vibration of the grinding chamber and the grinding bodies present therein, together with the material to be ground, a mass resembling a fluidized bed is formed.
    According to a preferred embodiment, said opening 10 in the second wall 9 is located at a distance from the bottom of the grinding chamber, which is 10 - 30% of the radius of the grinding chamber.
    According to another preferred embodiment, said opening or openings 8 in said first wall 5 have a total area of 1-60% of the area of the first wall 5.
    Because the material to be ground is fed into the lower part of the grinding chamber and discharged into the upper part of the grinding chamber on the opposite side of the grinding chamber compared to the inlet opening, the residence time of the material in the grinding chamber will be significantly longer than when the material is fed into the grinding chamber. is the case with a mill according to said Canadian patent.
    In a conventional mill of the present kind, the residence time can be 1.5 - 2 minutes. In the present mill with the same dimensions, the comparable residence time is 3.5 - 5 minutes. 10 15 20 25 30 35 535 290 In Figure 1, the line ll indicates the level of 80% of maximum load, which is a suitable load level for grinding. The load consists of grinding bodies as well as the material to be ground.
    Furthermore, fed material cannot migrate directly to the outlet opening, as mentioned above in connection with the Canadian patent. Therefore, no impermeable wall is needed to prevent such migration.
    According to a preferred embodiment, there is a second wall 9 inside the grinding chamber, which is located at the insertion opening 2 and which is provided with an opening 10 in its lower part for insertion of material to be ground.
    Said first wall 5 and said second wall 9 are circular with a central hole for said tube 4.
    The present invention thus solves the problem mentioned in the introduction.
    The following tables show an experiment with Class F fly ash according to ASTM C 618, which shows that the fly ash acquires a higher degree of fineness and a higher chemical activity after being ground with a vibration mill according to the present invention.
    Table 1. Particle size.
    Particle size Fraction Traditional Vibration mill Vibration mill according to the invention 1 micrometer 27 55 10 micrometers 55 67 45 micrometers 97 95 20 25 30 535 280 Table 2. Development of strength according to ASTM C 109.
    Type of cement-based Compression strength MPa material Curing time, days 1 3 7 28 Portland cement (PC) 10.2 26.5 30 38.6 50% PC + 50% fly ash ** 8.5 24.7 31.2 42.1 50 % PC + 50% fly ash * 12.3 28.7 35.2 48.1 * Fly ash treated in a mill according to the present invention ** Fly ash treated in a traditional mill.
    As can be seen from the tables, fly ash treated in a vibratory mill according to the present invention has a significantly higher fraction of particles in the range of 1 to 10 micrometers and a significantly higher chemical reactivity, leading to a significantly higher compression strength both at a short and a long curing time. This means that a larger proportion of Portland cement can be replaced with fly ash.
    Various embodiments have been described above. However, it is obvious that the design of the inlet opening can be varied as well as the proportions of the grinding chamber in terms of the ratio length to diameter.
    The present invention should therefore not be construed as limited to the above embodiments, but may be varied within the scope of the appended claims.
    权利要求:
    Claims (4)
    [1]
    A vibrating mill primarily for treating cement and fly ash, which mill has a grinding chamber (1) with a wall (6, 7) at both ends of the chamber, which mill comprises an inlet to be treated and an outlet opening (2 ) for material, supply opening (3) at the rear wall (7) of the grinding chamber (1), at the lower part of the grinding chamber and a first wall (5) inside the chamber at the end, where the outlet opening (3) is located, which wall (5) is provided with one or more openings (8) in its upper part, which allow passage of sufficiently ground material from the grinding chamber to the outlet opening (3), is located in the characteristic of the grinding chamber (1), that the inlet opening (2) lower part at the wall (6) opposite to which the outlet opening is located.
    [2]
    Vibration mill according to claim 1, characterized in that there is a second wall (9) inside the grinding chamber, which is located at the insertion opening (2) and which is provided with an opening (10) in its lower part for insertion of materials to be ground.
    [3]
    Vibration mill according to claim 1 or 2, characterized in that said opening (10) in the second wall (9) is located at a distance from the bottom of the grinding chamber, which is 10 - 30% of the radius of the grinding chamber.
    [4]
    Vibration mill according to claim 1, 2 or 3, characterized in that said opening or openings (8) in said first wall (5) have a total area of 1 - 60% of the area of the first wall (5) .
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    同族专利:
    公开号 | 公开日
    SE1150426A1|2012-06-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150426A|SE1150426A1|2011-05-12|2011-05-12|vibration Mill|SE1150426A| SE1150426A1|2011-05-12|2011-05-12|vibration Mill|
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