High-speed pulverizing method and equipment

Apparatus for producing finely pulverized powder, including an ambient temperature high-speed fine pulverizer, which comprises:

• a fixed grindstone with radially engraved feed grooves and a flat grinding area located at an outer circumference thereof;
• a pulverizing chamber with a reduced pressure environment;
• a rotatable bottom grindstone located in the pulverizing chamber, the rotating grindstone having radially engraved feed grooves and a flat grinding area located at an outer circumference thereof opposed to said fixed grindstone and forming a clearance therebetween of 100 to 3,000 .mu.m;
• a rotating disk upon which the grindstone is located, the disk having a plurality of ejection wings for generating suction upon rotation of the rotating disk wherein a reduced-pressure jet steam is generated by rotating the ejection wings so as to suck air from the clearance formed between the fixed grindstone and rotating grindstone and pulverizing raw material is forcedly passed through the clearance while the raw material is whirled so as to be finely pulverized and wherein temperature-raising energy due to rolling, shear, compression and heat of friction generated upon pulverization is reduced by said jet stream by exerting a cooling effect on the fixed grindstone and rotating grindstone;
• and
• an air filtration screen receiving the pulverized raw material;
• a jetting vessel having a passage in the shape of an inverted truncated cone and provided at a tip portion of a feed pipe located in proximity with the filtration screen, said jetting vessel introducing powder obtained from said pulverized raw material, said jetting vessel being located in a lower casing located below said filtration screen and said lower casing having an opening at a lower end thereof;
• an upper casing positioned on said lower casing and having a powder exit connected to an external air suction source, said filtration screen separating the lower casing from the upper casing;
• an air brush blowing high-pressure air against said filtration screen wherein said air brush is provided above said filtration screen;
• and
• a powder recovery case wherein a lower end of the lower casing is positioned in the powder recovery case, an external air-introductory port is provided in said casing and a freely detachable powder accommodating pot is located at the lower portion of the casing wherein powder introduced from said feed pipe by a rising jet stream of air in the jetting vessel is sucked from the lower end opening of the lower casing and is classified into one of undersized powder passing through the filtration screen for ejecting from a powder exit and oversized powder not passing through the filtration screen so as to fall and be deposited into the power-accommodating pot.