Showing papers on "Jet mill published in 1969"
TL;DR: In this paper, the results of 239 experimental runs on grinding calcite of particle size range 0.15-1.70 mm in an experimental jet mill of 20 mm diameter, using feed rates of 5-150 g/min and air pressure of 3-6 kg/cm 2 G are reported.
30 citations
Patent•
25 Jul 1969
TL;DR: A supersonic jet mill for producing extra fine and uniform powder from pregranulated material continuously, having a chamber to pulverize material by mutual collision and friction of granular material in a swirl of pneumatic fluid introduced through jet nozzles.
Abstract: A supersonic jet mill for producing extra fine and uniform powder from pregranulated material continuously, having a chamber to pulverize material by mutual collision and friction of granular material in a swirl of supersonic pneumatic fluid introduced through jet nozzles, another chamber to separate the pulverized fine powder from coarse powder in a swirl of pneumatic fluid, a cylinder to take out the fine powder without including material in process, and conduits to return the coarse powder to the pulverization chamber by way of the jet nozzles with auxiliary pulverizing effects.
12 citations
Patent•
29 Jan 1969
TL;DR: In this article, the authors present a flow path between the first stack, the classification section and the second stack along which the flow of gas and particles is accelerated by injection of gas by nozzles 44, 46.
Abstract: 1,141,552. Drying apparatus. FLUID ENERGY PROCESSING & EQUIPMENT CO. 16 Jan., 1967, No. 2212/67. Heading F4G. [Also in Divisions B1 and B2] To economize in high pressure gas supply to a jet mill 10, transport of the material around the mill is assisted by injection of gas, which may be at relatively low pressure, by subsidiary nozzles 44, 46, Fig. 1, or by recirculation of gas by impellers 312, 314, Fig. 7. The mill 10 comprises an impact chamber 12, compressedgas jets 36, feed devices 38, a first stack 14 connected with the impact chamber and with an arcuate classification section 16, which has outlet conduits 30, 32; a second stack 20 is connected with the classification section and with a recycle chamber 28, which is, in turn, connected with the inlet of the first stack 14. There is thus a circulatory flow path between the first stack, the classification section and the second stack along which the flow of gas and particles is accelerated by injection of gas by nozzles 44, 46. The fine pulverized material leaves via the conduits 30, 32. Gases used may be cool or hot air, steam, products of combustion, inert or reactive gases. Modification may include oppositely-rotating impellers 222, 224, Fig. 5, which not only induce high speed air circulation but may throw particles against each other, causing impact pulverization. The apparatus may be used for grinding coal, coke, metal, synthetic resins, ceramics, instant coffee, tea, cocoa, and for drying and mixing, coating, or facilitating chemical reactions by use of feed channels 48, 50.
2 citations