Solid material comminution or disintegration – Processes
Patent
1995-08-31
1997-09-16
Husar, John M.
Solid material comminution or disintegration
Processes
241 20, 241 23, 241 41, C21B 308
Patent
active
056671474
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method of granulating and disintegrating molten material and grinding stock as well as to an arrangement for granulating and disintegrating blast furnace slag, clinker or the like, wherein molten slag is cooled with water under formation of a glass phase.
2. The Prior Art
Molten blast furnace slag, as a rule, is granulated by aid of water in order to obtain an amorphous product solidifying in the glass phase, i.e., a metastable phase. After a grinding procedure, such a product may be admixed to cements as a hydraulically active component. With such a mode of operation, the latent heat of the melt flow is converted into a low temperature heat of water and cannot be further utilized.
Also when cooling molten steel slags, the heat usually is cooled by ambient air via radiation and convection procedures. Waste heat of this kind cannot be readily utilized technologically, either.
On the whole, the latent heat of melt is extremely poorly utilized thermodynamically and technologically in all of the known granulation and cooling processes for slags, the originally contained energy substantially being used to store the originally contained energy in the form of the metastable glass phase of the end product and to prevent transformation into a stable crystalline state.
SUMMARY OF THE INVENTION
The invention aims at providing a method of the initially defined kind by which it is feasible to thermodynamically utilize the latent heat of slags in a substantially better way and to render energetically more favorable the grinding step usually required in case of further use as a cement aggregate or for pulverizing clinker for the production of cement. To solve this object, the method according to the invention essentially consists in that the melt is introduced into a mixing chamber by compressed air, that water, water vapor and/or air/water mixtures are injected into the mixing chamber through nozzles and that the evaporated water, together with the solidified slag, is expelled by means of a diffuser. By the fact that the melt is introduced into a mixing chamber by compressed air, and water, water vapor and/or air/water mixtures are nozzled into the mixing chamber, a rapidly expanding dispersion of solidifying molten material forms, the expanding gas stream being expelled through a diffuser. In doing so, the gas stream entrains the particles solidified to amorphous slag glass, while extremely increasing in volume with the thermal energy being converted into kinetic energy allowing for a directional flow of the granulated material formed. The pressure prevailing within the mixing chamber substantially corresponds to the flow losses of the strongly overheated water vapor formed. The slag heat primarily is converted into flow energy, the amorphous slag glass particles being entrained with the flow. As a result, the high kinetic energy can be applied directly to the disintegration of grain that is too large, to which end the method advantageously is realized in a manner that the jet emerging from the diffuser is directed against a baffle or a jet emerging from a further diffuser. Due to the collision with further particle streams streaming out at a high kinetic energy, or with a baffle, the kinetic energy is utilized so as to reduce the energy input required for the grinding procedure, a substantially farther-reaching utilization of the heat contained in the melt than has been feasible with known methods, thus, being ensured.
On account of the rapid increase in volume and the resulting expansion in the direction of the outlet opening of the vapor diffuser, a negative pressure can build up in the region of the maximum flow speed so as to render feasible, in that region, the dosing of additives by utilizing the effect of an injector. Advantageously, the method according to the invention is carried out in a manner that additional grinding stock or additives are introduced between the mixing chamber and the diffuser via an injector. Subsequently
REFERENCES:
patent: 2450978 (1948-10-01), Meinzer
patent: 5441205 (1995-08-01), Kanazumi et al.
Patent Abstracts of Japan, vol. 2, No. 144 (CO29) Nov. 30, 1978 & JP,A,53 109 895, Sep 26, 1978.
"Holderbank" Financiere Glarus AG
Husar John M.
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