Solid material comminution or disintegration – Processes
Patent
1999-06-29
2000-07-04
Husar, John M.
Solid material comminution or disintegration
Processes
241 5, 241 15, 241 17, 241 38, 241 41, C21B 308
Patent
active
060826401
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for granulating and comminuting molten material, in which the slag melt is acted upon by compressed water and discharged together with at least a portion of the vapour formed, as well as a device for carrying out this process.
2. Prior Art
Metallurgical slags of suitable chemical compositions are frequently granulated, i.e., quenched with water out of the melt flow with a view to largely preventing crystallization by rapid solidification and obtaining an amorphous glassy granule structure instead. Such granulates are valuable raw materials for the production of hydraulic binders. The production of such binders calls for the additional steps of drying and fine grinding the granulates, and hence two further energy-consuming processes.
Austrian Patent No. 400 140 has already described a process for granulating and comminuting molten material and grinding material as well as a device for carrying out this process, in which the melt is introduced into a mixing chamber under pressure and compressed water vapour or water vapour mixtures are nozzled into the mixing chamber. Due to the rapid expansion a pressure was built up in that known process, which, via a diffuser, caused the rapid ejection of the solidified particles. The kinetic energy of the rapidly ejected particles in that device could be utilized for comminution, wherein the jet emerging from the diffuser could be directed against a baffle plate or a jet emerging from a further diffuser. As in contrast to the conventional granulation of molten blast furnace slag with water, such a mode of procedure enables the slag melt heat to be thermodynamically and technically utilized in a better way. By cooling in water, the low temperature heat developing can be utilized to an insufficient degree only. The same applies for the known cooling of molten steel slags by giving off heat through radiation or convection. The use of compressed water for acting upon slag melts while simultaneously utilizing for comminution the kinetic energy gained in that manner has already constituted an essential improvement in this respect.
SUMMARY OF THE INVENTION
The invention aims at further developing a process of the initially defined kind with a view to further improving the utilization of slag melt heat for comminution or surface enlargement operations while lowering energy consumption and, at the same time, providing the opportunity of substantially suppressing H.sub.2 S degassing. To solve this object, the process according to the invention essentially consists in that the liquid slag is introduced into a granulation chamber in a free flowing jet, compressed water jets are directed against the slag jet, whereupon the solidified and granulated slag is conducted through a pneumatic conveyor duct and a distributor together with at least a portion of the vapour formed and the partial streams leaving the distributor, via conically tapering nozzles, are transferred into a grinding space exhibiting a lower pressure than the granulation space and from which the comminuted and solidified material is drawn off. By directing compressed water against the slag jet, the prerequisite for hydrogen sulphide formed being included in the slag solidifying under pressure is provided such that only substantially slighter residual amounts of H.sub.2 S will be observed in the concentrated exhaust vapour stream and intensive and rapid cooling will be obtained, thereby directly enabling further comminution, for instance in a fluidized-bed counter jet mill or in the fluidized bed, via a connected duct and appropriate distribution. To this end, the process according to the invention is controlled in a manner that the solidified and granulated slag is conducted through a distributor along with the vapour formed. The granulated slag stream in the distributor is subdivided into further partial streams which may be introduced directly into a grinding space via conically tapering nozzles so as to effect further comminu
REFERENCES:
patent: 3615329 (1971-10-01), Jones
patent: 4218201 (1980-08-01), Kozima et al.
patent: 4909837 (1990-03-01), Hansen et al.
patent: 5441205 (1995-08-01), Kanazumi et al.
patent: 5667147 (1997-09-01), Edlinger
patent: 5992773 (1999-11-01), Schwechten
Patent Abstract Of Japan vol. 006, No. 019 (C-090), Feb. 3, 1982 & JP 56 142806 A Nov. 7, 1981, Uozumi Ikuo.
Patent Abstract Of Japan, vol. 006, No. 231 (C-135), Nov. 17, 1982 & JP 57 134501 A, Aug. 19, 1982, Iowa Norita.
"Holderbank"Financiere Glarus AG
Husar John M.
LandOfFree
Method for granulating and grinding molten material and device f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for granulating and grinding molten material and device f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for granulating and grinding molten material and device f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1478686