EP0004756A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Rotary drum and method of mixing, drying, cooling, heating or calcining solid particles
Assignee: Bethlehem Steel Corp
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Filing: 1979-03-30
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Granted: —
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Expires: 1999-03-30
Abstract
Abstract A mixer block (20) for use in a rotary kiln (10) for mixing, drying, cooling, heating, or calcining of solid materials such as gravel, stone or fluxes, has a base surface (21), two aide surfaces (22, 23) converging away from the base surface (21) to define therewith a generally triangular cross-sectional shape. In use in the rotating kiln one (22) of the converging side surfaces serves as a leading surface and the other (23) as a trailing surface. The base surface (21) and the two converging side surfaces intersect to include respective angles which are between plus 10* and minus 10* of the angle of repose of the material being troated, the block (20) thereby producing a more uniform product with minimal production of fines and dust. The mixer block (20) is especially useful when used as part of the refractory lining (12) in a rotary kiln to calcine fluxstone such as limestone, dolomite, dolomitic limestone or magnes i te.
Inventors
- 👤 Carl Edward Sunnergren
- 👤 John Kerwin Simms
- 👤 Dale Walter Brinker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:52
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/14; F27B7/16; F27B7/161; F27B7/162
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
138 words
A mixer block suitable for use in the interior of a rotary kiln to mix, dry, cool, heat or calcine solid particles of a material, characterized by the mixer block having a base surface (21) and two converging side surfaces (22,23) related to the base surface to define therewith a generally triangular shape in cross-section, one (22) of said converging side surfaces being a leading surface and the other (23) of said converging side surfaces being a trailing surface, and end surfaces (21a, 21b), and two included angles (a,b) formed by the intersection of the base surface and the two converging side surfaces, the included angle formed by the intersection of the leading surface and the base surface being between plus 10° and minus 10 * of the angle of repose of the material in the rotary kiln.
Claim 2
Dependent Claim
138 words
A mixer block suitable for use in the interior of a rotary kiln to mix, dry, cool, heat or calcine solid particles of a material, characterized by the mixer block having a base surface (21) and two converging side surfaces (22,23) related to the base surface to define therewith a generally triangular shape in cross-section, one (22) of said converging side surfaces being a leading surface and the other (23) of said converging side surfaces being a trailing surface, and end surfaces (21a, 21b), and two included angles (a,b) formed by the intersection of the base surface and the two converging side surfaces, the included angle formed by the intersection of the leading surface and the base surface being between plus 10° and minus 10 * of the angle of repose of the material in the rotary kiln.
Claim 3
Dependent Claim
182 words
The mixer block according to claim 1, in a modified construction said generally triangular shape defines an upper portion of the mixer block which in that case has a generally polygonal cross-section having a quadrilateral lower portion (25) which also has a base surface (27) and two converging side surfaces (28,29) extending upwardly from the base surface (27) of the lower portion, the triangular upper portion being an extension of the lower portion with the base surface of the upper portion being common with a top surface of the lower portion and with said side surfaces of the upper portion extending upwardly from the side surfaces of the lower portion to form a top surface of the block which because of the shape of the lower and upper portions of the block has end surfaces of polygonal form, the intersection of the leading surface of the upper portion of the mixer block with the base surface of the upper portion forming an included angle which is between plus 10° and minus 10° of the angle of repose of the material being calcined.
Claim 4
Dependent Claim
39 words
The mixer block of claim 1 or 2, wherein the included angle formed by the intersection of the trailing surface and its base surface is between plus 10° and minus 10° of the angle of repose of the material.
Claim 5
Dependent Claim
39 words
The mixer block of claim 1 or 2, wherein the included angle formed by the intersection of the leading surface and its base surface is between plus 5° and minus 5° of the angle of repose of the material.
Claim 6
Dependent Claim
41 words
The mixer block according to claim 4, wherein the included angle formed by the intersection of the trailing surface and its base surface is between plus 5° and minus 5° of the angle of repose of the material in the kiln.
Claim 7
Dependent Claim
25 words
The mixer block of any one of-the preceding claims, wherein each of the leading and trailing surfaces is provided with a plurality of flights (22a,22b).
Claim 8
Dependent Claim
27 words
The mixer block of any one of the preceding claims wherein a half conical end portion (21a) is provided at least at one of the end surfaces.
Claim 9
Dependent Claim
68 words
A plurality of mixer blocks, each according to any one of the preceding claims, anchored at selected locations around the periphery of the interior of a rotary kiln and at spaced intervals longitudinally in said kiln having an outer metallic shell (11) provided therewithin with a refractory lining (12) including a plurality of refractory blocks (18), said kiln further having a feed end (14) and a discharge;end (15).
Claim 10
Dependent Claim
59 words
The plurality of mixer blocks according to claim 8, wherein the kiln within which the block or blocks are used has a burner (16) mounted axially within the shell in its discharge end so that hot gases produced pass countercurrently in the kiln to the passage of said solid particles of material comprising limestone, dolomite, dolomitic limestone or magnesite.
Claim 11
Dependent Claim
47 words
The plurality of mixer blocks according to claim 8 or 9, wherein the refractory lining includes at least two sets of elongated refractory mixer blocks spaced at intervals longitudinally in the kiln, each set including mixer blocks which are equally spaced around the periphery of the kiln.
Claim 12
Dependent Claim
38 words
The plurality of mixer blocks according to claim 10, wherein the sets of mixer blocks at spaced intervals along the length of the kiln are displaced by about 20° from each other around the periphery of the kiln.
Claim 13
Dependent Claim
37 words
The plurality of mixer blocks according to any one of claims 8 to 11, wherein the height of the mixer blocks is at least one-third the depth of the solid particles of the material in the kiln.
Claim 14
Dependent Claim
190 words
An improved refractory lining in a rotary drum which has an outer metallic shell, a feed end and a discharge end, and means for treating solid particles which are fed into the feed end and pass through the drum to the discharge end, said refractory lining including a plurality of refractory blocks, characterized by anchoring a plurality of generally triangularly shaped refrac- lory mixer blocks at selected locations around the periphery of the interior of the drum and at spaced intervals longitudinally in said drum, said mixer blocks having converging side surfaces, a base surface and included angles formed by the intersection of the base surface and the converging side surfaces, one of said converging side surfaces being a leading surface and the other of said converging side surfaces being a trailing surface, the angle formed by the intersection of the leading surface and the base surface being between plus 10° and minus 10° of the angle of repose of the solid particles whereby said solid particles are carried along the periphery of said interior of said drum and roll downwardly in layers upon themselves while passing through said drum.
Claim 15
Dependent Claim
190 words
An improved refractory lining in a rotary drum which has an outer metallic shell, a feed end and a discharge end, and means for treating solid particles which are fed into the feed end and pass through the drum to the discharge end, said refractory lining including a plurality of refractory blocks, characterized by anchoring a plurality of generally triangularly shaped refrac- lory mixer blocks at selected locations around the periphery of the interior of the drum and at spaced intervals longitudinally in said drum, said mixer blocks having converging side surfaces, a base surface and included angles formed by the intersection of the base surface and the converging side surfaces, one of said converging side surfaces being a leading surface and the other of said converging side surfaces being a trailing surface, the angle formed by the intersection of the leading surface and the base surface being between plus 10° and minus 10° of the angle of repose of the solid particles whereby said solid particles are carried along the periphery of said interior of said drum and roll downwardly in layers upon themselves while passing through said drum.
References Cited (Backward Citations)
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