Fines Removal Apparatus and Methods/Systems Regarding Same

• US 20090194470A1
• Filed: 08/11/2005
• Published: 08/06/2009
• Est. Priority Date: 08/13/2004
• Status: Active Grant

• Current Assignee: Regents of The University of Minnesota (University of Minnesota)
• Original Assignee: Regents of The University of Minnesota (University of Minnesota)
• Inventors: Bleifuss, Rodney L., Hendrickson, David W., Kiesel, Richard F.
• Granted Patent: US 8,020,706 B2
• Time in Patent Office: Days
• US Class Current: 209/691
• CPC Class Codes: B07B 13/003 Separation of articles by differences in their geometrical form or by difference in their physical properties, e.g. elasticity, compressibility, hardness
• CPC Class Codes: B07B 13/04 according to size
• CPC Class Codes: B07B 13/05 using material mover cooperating with retainer, deflector or discharger B07B13/065 - B07B13/075 take precedence
• CPC Class Codes: B07B 13/11 involving travel of particles over surfaces which separate by centrifugal force or by relative friction between particles and such surfaces, e.g. helical sorters
• CPC Class Codes: B08B 3/022 Cleaning travelling work B08B3/042 takes precedence
• CPC Class Codes: B65G 15/42 having ribs, ridges, or other surface projections

Abstract

Apparatus, methods and systems are used to separate fines from objects of a feed mixture being processed (e.g., iron bearing pellets, chips and dust). For example, at least a portion of an endless belt defining a channel is movable up an incline relative to horizontal (e.g., an incline that is at an angle relative to horizontal that is greater than an angle of repose associated with the objects, but less than an angle of repose associated with the fines being removed). Further, obstruction elements may be used on the endless belt to impede the flow of the fines down the incline.

Claims

1-57. -57. (canceled)

58. A fines removal apparatus for use in separation of objects from a feed mixture, wherein the feed mixture comprises the objects and fines, the apparatus comprising:

an endless belt, wherein at least a portion of the endless belt is movable up an incline relative to horizontal, wherein the incline is adjustable to an angle relative to horizontal that is greater than an angle of repose associated with the objects but less than an angle of repose associated with the fines, wherein the endless belt comprises;

an endless base section having a predetermined length,

first and second sidewalls, wherein the endless base section and the first and second sidewalls define a channel of the endless belt, wherein the channel is configured to receive the feed mixture therein, wherein each of the first and second sidewalls comprises a flexible sidewall, wherein the flexible sidewall comprises one or more surfaces that define one or more openings adjacent the channel of the endless belt, and further wherein one or more deflection elements are positioned relative to the one or more openings to form substantially flat sidewalls adjacent the channel; and

a plurality of obstruction elements, wherein each obstruction element comprises at least one surface portion that extends between a first position and a second position of the endless base section such that the at least one surface portion impedes a flow of fines down the incline when feed mixture is provided in the channel and as the portion of the endless belt is moved up the incline; and

a drive apparatus coupled to the endless belt to move the portion of the endless belt up the incline.

59. The apparatus of claim 58, wherein each of the first and second sidewalls comprises a corrugated sidewall, wherein the corrugated sidewall comprises a plurality of folds that define cavities adjacent the channel of the endless belt, and further wherein one or more deflection elements are positioned relative to the one or more cavities to form substantially flat sidewalls adjacent the channel.

60. The apparatus of claim 58, wherein the one or more deflection elements comprise plug elements affixed in the one or more openings to form substantially flat sidewalls adjacent the channel.

61. The apparatus of claim 58, wherein the one or more deflection elements comprise plug material integrally molded with the first and second sidewalls to form substantially flat sidewalls adjacent the channel.

62. The apparatus of claim 58, wherein the one or more deflection elements comprise a skirt element positioned adjacent the openings to form substantially flat side walls, wherein the skirt element is supported above the endless base section and separate from the first and second sidewalls.

63. The apparatus of claims 58, wherein a conveyor having a conveyor length is provided, wherein the conveyor is aligned with and positioned below at least a major portion of the endless belt and outward from an upper end of the endless belt such that fines moved up the incline and separated from the objects are carried away and fines undesirably associated with the endless belt as it is returned from the upper end to a lower end thereof are deposited on the conveyor to be carried away.

64. The apparatus of claim 58, wherein the at least one surface portion of each obstruction element is non-orthogonal relative to the length of the endless base section.

65. The apparatus of claim 58, wherein each obstruction element has a thickness that is 50 percent or less than a maximum cross-section dimension of the objects of the feed mixture.

66. The apparatus of claim 58, wherein the at least one surface portion of each obstruction element comprises a surface positioned at an angle relative to a plane extending across a width of the endless belt and orthogonal to the length of the endless base section.

67. The apparatus of claim 66, wherein the angle relative to the plane extending across the width of the endless belt and orthogonal to the length of the endless belt is greater than the angle of repose for the objects to be processed but less than an angle of repose associated with the fines.

68. The apparatus of claim 58, wherein the feed mixture comprises rounded iron bearing pellets.

69. The apparatus of claim 58, wherein the first and second sidewalls of the endless belt extend from the base section of the endless belt a predetermined distance measured perpendicularly from the base section to a distal end of the first and second sidewalls, and further wherein the predetermined distance is greater than 3 times the maximum cross-section dimension of the objects of the feed mixture.

70. The apparatus of claim 58, wherein the incline is at an angle relative to horizontal that is greater than an angle of repose associated with the objects but less than 5 degrees more than the angle of repose associated with the objects.

71. The apparatus of claim 58, wherein the apparatus further comprises a feed distributor apparatus comprising a plurality of distributor elements configured to provide a distribution of the objects across substantially an entire width of the endless belt, the width being orthogonal to the predetermined length.

72. The apparatus of claim 58, wherein each of the first and second sidewalls includes a first proximal end sealed to the base section along the predetermined length and a second distal end, and further wherein the first and second sidewalls comprise the flexible sidewalls such that the second distal end is expandable to a length that exceeds the predetermined length of the base section.

73-86. -86. (canceled)

87. A method for use in separation of objects from a feed mixture, wherein the feed mixture comprises the objects and fines, the method comprising:

moving at least a portion of an endless belt up an incline between a first position and a second position, wherein the second position is elevated with respect to the first position, wherein the incline is at an angle relative to horizontal that is greater than an angle of repose associated with the objects but less than an angle of repose associated with the fines, wherein the endless belt comprises an endless base section;

providing first and second sidewalls, wherein the endless base section and the first and second sidewalls define a channel;

providing a plurality of obstruction elements, wherein each obstruction element comprises at least one surface portion that extends between a first position and a second position of the endless base section such that the at least one surface portion impedes a flow of the fines down the incline when feed mixture is provided in the channel and as the portion of the endless belt is moved up the incline, wherein the at least one surface portion is non-orthogonal relative to the length of the endless base section, and further wherein each obstruction element has a thickness that is 50 percent or less than a maximum cross-section dimension of the objects of the feed mixture; and

receiving the feed mixture within the channel, wherein the objects of the feed mixture flow downward toward the first position and the fines move upward toward the second position as the at least a portion of the endless belt is moved up the incline.

88. The method of claim 87, wherein the at least one surface portion of each obstruction element comprises a surface positioned at an angle relative to a plane extending across a width of the endless belt and orthogonal to the length of the endless base section, and further wherein the angle relative to the plane extending across the width of the endless belt and orthogonal to the length of the endless belt is greater than the angle of repose for the objects to be processed but less than an angle of repose associated with the fines.

89. The method of claim 87, wherein the plurality of obstruction elements comprises a first set of elongated obstruction elements extending downward at an angle relative to the first sidewall and partially across a width of the endless belt and a second set of elongated obstruction elements extending downward at an angle relative to the second sidewall and partially across the width of the endless belt, wherein the first and second sets of elongated obstruction elements are provided in an alternating arrangement such that a continuous “

S”

flow pattern is defined thereby.

90. The method of claim 89, wherein the angle associated with each of the first and second sets of elongated obstruction elements is an angle relative to a plane extending across a width of the endless belt and orthogonal to the length of the endless belt, and further wherein the angle is greater than the angle of repose for the objects to be processed but less than an angle of repose associated with the fines.

91. The method of claim 87, wherein the method further comprises maintaining the endless base section of the at least a portion of the endless belt moving up the incline in a substantially planar configuration.

92. The method of claim 87, wherein the endless base section further comprises a textured surface for contact with the feed mixture.

93. The method of claim 87, wherein the feed mixture comprises rounded iron bearing pellets.

94. The method of claim 87, wherein each of the first and second sidewalls of the endless belt include a first proximal end proximate at least a portion of the base section of the endless belt and a second distal end located a predetermined distance measured perpendicularly from the base section, and further wherein the predetermined distance is greater than 3 times the maximum cross-section dimension of the objects of the feed mixture.

95. The method of claim 87, wherein each of the first and second sidewalls comprises a skirt element supported above at least a portion of the endless base section.

96. The method of claim 87, wherein each of the first and second sidewalls include a first proximal end sealed to the base section along the predetermined length and a second distal end, and further wherein the first and second sidewalls are flexible sidewalls such that the second distal end is expandable to a length that exceeds the predetermined length of the base section.

97. The method of claim 87, wherein each of the first and second sidewalls comprises a substantially flat sidewall.

98. The method of claim 87, wherein the method further comprises:

monitoring one or more characteristics of the fines removed from the feed mixture and providing an output representative of such monitoring; and

adjusting the speed of the endless belt and/or the angle of incline based on the output.

99. The method of claim 87, wherein the incline is at an angle relative to horizontal that is greater than an angle of repose associated with the objects but less than 5 degrees more than the angle of repose associated with the objects.

100. The method of claim 87, wherein the thickness of the obstruction elements is one quarter inch or less.

101. A method for use in separation of iron bearing objects having a similar size and shape from a feed mixture, wherein the feed mixture comprises the iron bearing objects and fines, and further wherein the iron bearing objects have a rounded shape and the fines have a constituent size that occupies less than one half the volume in space occupied by one of the iron bearing objects, the method comprising:

providing an endless belt comprising an endless base section having a predetermined length;

providing first and second sidewalls, wherein the endless base section and the first and second sidewalls define a channel;

providing a plurality of elongated obstruction elements that extend between a first position and a second position of the endless base section such that the plurality of elongated obstruction elements impede a flow of the fines down the incline when feed mixture is provided in the channel and as the portion of the endless belt is moved up the incline, wherein each of the plurality of elongated obstruction elements is positioned non-orthogonal relative to the length of the endless base section and extends partially across a width of the endless belt;

moving at least a portion of the endless belt up an incline between a first position and a second position, wherein the second position is elevated with respect to the first position;

positioning the endless belt such that the incline is at an angle relative to horizontal that is greater than an angle of repose associated with the iron bearing objects but less than an angle of repose associated with the fines;

receiving the feed mixture within the channel;

allowing at least some of the iron bearing objects of the feed mixture to flow downward toward the first position over the elongated obstruction elements as the at least a portion of the endless belt is moved up the incline;

impeding the downward flow of the fines toward the first position using the elongated obstruction elements as the at least a portion of the endless belt is moved up the incline; and

moving the fines upward toward the second position using the elongated obstruction elements as the at least a portion of the endless belt is moved up the incline.

102. The method of claim 101, wherein the method further comprises allowing at least some of the iron bearing objects to flow along one or more of the elongated obstruction elements positioned at an angle, relative to a plane extending across the width of the endless belt and orthogonal to the length of the endless base section, that is greater than the angle of repose for the iron bearing objects but less than an angle of repose associated with the fines.

103. The method of claim 101, wherein the plurality of elongated obstruction elements comprises a first set of elongated obstruction elements extending downward at an angle relative to the first sidewall and partially across a width of the endless belt and a second set of elongated obstruction elements extending downward at an angle relative to the second sidewall and partially across the width of the endless belt, wherein the first and second sets of elongated obstruction elements are provided in an alternating arrangement such that a continuous “

S”

flow pattern is defined thereby.

104. The method of claim 103, wherein the angle associated with each of the first and second sets of elongated obstruction elements is an angle, relative to a plane extending across a width of the endless belt and orthogonal to the length of the endless belt, that is greater than the angle of repose for the iron bearing objects to be processed but less than an angle of repose associated with the fines.

105. The method of claim 101, wherein the method further comprises maintaining the endless base section of the at least a portion of the endless belt moving up the incline in a substantially planar configuration using a plurality of rollers positioned between the first position and the second position.

106. The method of claim 101, wherein each of the first and second sidewalls comprise a first proximal end proximate the endless base section and a distal end at a predetermined distance measured perpendicularly from the base section, and further wherein the predetermined distance is greater than 3 times the maximum cross-section dimension of the iron bearing objects of the feed mixture.

107. The method of claim 101, wherein each of the first and second sidewalls comprises a skirt element supported above at least a portion of the endless base section.

108. The method of claim 101, wherein each of the first and second sidewalls includes a first proximal end sealed to the base section along the predetermined length and a second distal end, and further wherein the first and second sidewalls are flexible sidewalls such that the second distal end is expandable to a length that exceeds the predetermined length of the base section.

109. The method of claim 101, wherein each of the first and second sidewalls comprises a substantially flat sidewall.

110. The method of claim 101, wherein the method further comprises:

monitoring one or more characteristics of the fines removed from the feed mixture and providing an output representative of such monitoring; and

adjusting the speed of the endless belt and/or the angle of incline based on the output.

111. The method of claim 101, wherein positioning the endless belt comprises setting the incline at an angle relative to horizontal that is greater than an angle of repose associated with the iron bearing objects but less than 5 degrees more than the angle of repose associated with the iron bearing objects.

112. The method of claim 101, wherein the iron bearing objects comprise one half inch rounded iron bearing pellets, and further wherein impeding the downward flow of the fines toward the first position comprises using the elongated obstruction elements having a thickness that impedes the flow of fines having a constituent size that occupies less than one half the volume in space occupied by one of the iron bearing objects.

113. The method of claim 101, wherein the elongated obstruction elements have a thickness that is one quarter inch or less.

114. A method for use in separation of objects from a feed mixture, wherein the feed mixture comprises the objects and fines, wherein the fines have a constituent size that occupies less than one half the volume in space occupied by one of the objects, the method comprising:

providing a belt comprising a base section having a length;

providing first and second sidewalls, wherein the base section and the first and second sidewalls define a channel;

providing a plurality of elongated obstruction elements, wherein each of the elongated obstruction elements extends between a first position and a second position of the base section, and further wherein each of the elongated obstruction elements is non-orthogonal relative to the length of the base section and extends partially across a width of the belt;

moving at least a portion of the belt up an incline between a first position and a second position, wherein the second position is elevated with respect to the first position;

receiving the feed mixture within the channel;

allowing at least some of the objects of the feed mixture to flow downward toward the first position over the elongated obstruction elements and forcing the fines downward toward the base section as the at least a portion of the belt is moved up the incline;

impeding the downward flow of the fines toward the first position using the elongated obstruction elements as the at least a portion of the belt is moved up the incline; and

moving the fines upward toward the second position using the elongated obstruction elements as the at least a portion of the belt is moved up the incline.

115. The method of claim 114, wherein impeding the downward flow of the fines toward the first position comprises using elongated obstruction elements having a thickness that impedes the flow of fines having a constituent size that occupies less than one half the volume in space occupied by one of the objects.

116. The method of claim 115, wherein allowing at least some of the objects of the feed mixture to flow downward toward the first position comprises setting the incline at an angle relative to horizontal that is greater than an angle of repose associated with the objects but less than an angle of repose associated with the fines.

117. The method of claim 116, wherein setting the incline comprises setting the incline at an angle relative to horizontal that is greater than an angle of repose associated with the objects but less than 5 degrees more than the angle of repose associated with the objects.

118. The method of claim 114, wherein the method further comprises allowing at least some of the objects to flow along one or more of the elongated obstruction elements positioned at an angle, relative to a plane extending across the width of the belt and orthogonal to the length of the base section, that is greater than the angle of repose for the objects but less than an angle of repose associated with the fines.

119. The method of claim 114, wherein the plurality of elongated obstruction elements comprises a first set of elongated obstruction elements extending downward at an angle relative to the first sidewall and partially across a width of the belt and a second set of elongated obstruction elements extending downward at an angle relative to the second sidewall and partially across the width of the belt, wherein the first and second sets of elongated obstruction elements are provided in an alternating arrangement such that a continuous “

S”

flow pattern is defined thereby.

120. The method of claim 119, wherein the angle associated with each of the first and second sets of elongated obstruction elements is an angle, relative to a plane extending across a width of the belt and orthogonal to the length of the belt, that is greater than the angle of repose for the objects to be processed but less than an angle of repose associated with the fines.

121. The method of claim 114, wherein the method further comprises maintaining the endless base section of the at least a portion of the endless belt moving up the incline in a substantially planar configuration using a plurality of rollers positioned between the first position and the second position to maintain the substantially planar configuration.

122. The method of claim 114, wherein the feed mixture comprises rounded iron bearing pellets.

123. The method of claim 114, wherein each of the first and second sidewalls of the belt comprise a proximal end proximate the base section of the belt and a distal end at a predetermined distance measured perpendicularly from the base section, and further wherein the predetermined distance is greater than 3 times the maximum cross-section dimension of the objects of the feed mixture.

124. The method of claim 114, wherein each of the first and second sidewalls comprises a skirt element supported above at least a portion of the base section.

125. The method of claim 114, wherein each of the first and second sidewalls comprises a substantially flat sidewall.

126. The method of claim 114, wherein each of the first and second sidewalls include a first proximal end sealed to the base section along the predetermined length and a second distal end, and further wherein the first and second sidewalls are flexible sidewalls such that the second distal end is expandable to a length that exceeds the predetermined length of the base section.

127. The method of claim 114, wherein the method further comprises:

monitoring one or more characteristics of the fines removed from the feed mixture and providing an output representative of such monitoring; and

adjusting the speed of the endless belt and/or the angle of incline based on the output.

128. The method of claim 114, wherein receiving the feed mixture within the channel comprises providing a distribution of the objects across substantially an entire width of the endless belt, the width being orthogonal to the predetermined length.