US1627982A

US1627982A - Method and means for the treatment of slags by fluids under pressure

Info

Publication number: US1627982A
Application number: US666975A
Authority: US
Inventors: Maguet Martial
Original assignee: Societe des Chaux et Ciments de Lafarge et du Teil SA
Current assignee: LafargeHolcim Ciments SA
Priority date: 1922-10-26
Filing date: 1923-10-06
Publication date: 1927-05-10
Anticipated expiration: 1944-05-10

Description

' 7 1,627,982 May 10, 1927. M. MAGUET METHOD AND MEANS FOR THE TREATMENT OF SLAGS BY FLUIDS UNDER PRESSURE Filed Oct. 6f 192:5

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compressed fluid, while at the.

"'vided) at a high temperature and of subthe said jets acting on a dismountable mem Patented May 10, 1927.

UNITED STATES 1,627,982 PATENT OFFICE.

MARTIAL menu; or LE rm, cnaux ET cnmnrs nu manor rnANcE, assxonon 'ro LA socim'rfi moms DE ET DU TE-IL, or LE VIVIEBS (mum), FRANCE.

METHOD AND MEANS FOR THE TREATMENT OII! SLAGS BY FLUIDS UNDER PRESSURE- Application filed October 6, 1928, Serial No. 668,975, and in France October 26, 1922.

- In certain of the-known methods for the disintegration of blast-furnace slags by means of a liquid or gaseous fluid under pressure, thejet of molten slag, whether or not it be ex anded is subjected. on one side only to the last of any shape, or else the jet of sla is pulverized by arotatory apparatus w ich the same time, allows the compressed fluid to escape from the centre cumference. For success, these processes necessitate a high expenditure of compressed fluid, without the certainty of always obtaining completely uniform disintegration.

The object of the present invention is to push the operation of disintegration to the with a minimum expenditure of same t'me maintaining uniform disintegration. I

The method consists in causing a solid stream of slag (by solid I mean undistantially'circular cross-section, to fall freely into the centre of an inverted cone formed by converging jets of fluid under pressure, uniformly on the stream a downward direction from the perip cry to the centre of the slag stream, the axis of flow of the slag coinciding with the axis of the cone formed by the converging jets.

This method of acting on the molten slag is realized in practice by making use of an insufliation apparatus in the form of an annular tuyere' having converging jets.

In the annexed drawing is given by way of example:

Fig. 1 is a diagrammatic plan view seen from below of an apparatus of't-ubular section having its tuyeres referably arranged er and the .jets of which converge on the same point.

Fig. 2 is a section on line 2-2 of Fig. 1.

Fig. 3 is a section on line 3-3 of 'Fig. 4 showing diagrammatically a modification of the dis ntegrator combined with a channel which centers the jet paratus'as it flows from the furnace.

Fig. 4 is a plan view of Fig. 3.

of molten sla in The apparatus shown in Figs. 1 and 2- consists essentially of a hollow ring a which communicates, by means of one or more conduits, such as y, with the source or reservoir of compressed fluid. The ring a is of plane from one or more tuyerestowards the cirof slag through the apmetal and is provided with perforations 1) arranged regularly at the same distance from the axls'of the apparatus and in a Perpendicular thereto. The inclination 0 the apertures 6 towards the axis is uniform and determines the emulsion point c. Theinclinatmn of these -orifices b or b,

as well as their diameters, their cross-sections, and theirnumber, are determined, in each case, by the fluid, liquid or gaseous, employed, and by the m of the slag jet h delivered by the channel 1'.

The apparatus can function not only in a vertical position as exemplified in Fig. 2, but in an inclined position provided that the orientation of the axis of the slag-jet be ap ro riately altered.

11 t e modification shown in Figs. 3 and 4 .the member a is combined with a channel i whichcenters the jet of slag through the ap aratus as it flows from the furnace throug the channel a.

The perforations b can be replaced by channels 6 arranged on the edge of the member p, Fig. 3.

To disintegrate a molten slag jet, whether the'slag be acid or basic, by the process of the invention, it is suflicient to direct the issuing slag jet h on to the apparatus a and to turn on the disintegrating fluid, which -reason of the convergence of the fluid jets under pressure which work with their full live power, in spite of a low expenditure of disintegratin fluid. This mechanical re- .duction will be effected to a greater degree of fineness, the higher the pressures employed. I

The speeds of reduction that may be attained allow of the immediate tempering of basic slags,-whether by water or by air, by direct or combined action and Wlllcll gives them hydraulic properties distinctly more pronounced than formegly The granules obtain are recovered in any manner. Also in the case of tempering by water under pressure the disintegrator device described hereinbefore can be arranged above a mechanical. transporter which gradually se arates-the disintegrated slag from the flui to effect as may be required either dry or wet granulation.

I am aware that prior to my invention it has been roposed to granulate slag by jets of fluid irected downwardly with respect to the flow of the slag but in such cases the jets have been directed against an annular or a flat stream of sla and I therefore do not claim the use of downwardly directed jets of fluid broadly.

What I claim as. my invention and desire to secure by Letters Patent of the United States is 1. A method for the reduction of molten slag by the action of a fluid under pressure consisting in causing a solid stream of calcareous slag at a high temperature and of substantially circular cross-section to fall freely into the centre of an inverted cone formed b converging jets of fluid under pressure tlie said jets playing uniformly on the stream of molten slag in a downward direction from the periphery to the centre of the slag stream, the axis of flow of the slag coincidlng with the axis of the cone formed by the converging jets.

2. An apparatus for granulating moltenslag, comprlsing an annularmember, means for causing a solid stream of molten slag of substantially circular cross-section to fall freely through said member along the vertical axis thereof, said member having means adapted to direct streams of fluid on said stream of molten slag and converging on a point on the axis of said falling stream be low said means, and means for conveying fluid under pressure to said fluid directing means.

3. An apparatus for granulating molten slag comprising an annular member, means for causin asolid stream of molten slag of substantially circular cross-section to fall freely through said member along the vertical axis thereof, said member having an annular series of perforations adapted to direct streams of fluid on said stream of molten slag and converging on a common point on the axis of said falling stream below the plane of said series of perforations and means for conveying fluid under pressure to said annular series of perforations.

4. An apparatus for granulating molten slag comprising an annular member, means for causing a stream of molten slag to fall freely through said member along the vertical axis thereof, said member having an annular passa 'e adapted to direct a stream of fluid on sai stream of molten slag and converging on said falling stream at a point thereon below said passage, and means for conveying fluid under pressure to said passa e.

n witnesswhereof I have signed this specification.

MARTIAL MAGUET.