WO2001064347A2 - Spiral concentrator unit - Google Patents

Spiral concentrator unit Download PDF

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Publication number
WO2001064347A2
WO2001064347A2 PCT/ZA2001/000027 ZA0100027W WO0164347A2 WO 2001064347 A2 WO2001064347 A2 WO 2001064347A2 ZA 0100027 W ZA0100027 W ZA 0100027W WO 0164347 A2 WO0164347 A2 WO 0164347A2
Authority
WO
WIPO (PCT)
Prior art keywords
polyurethane
mould
backing layer
spiral
layer
Prior art date
Application number
PCT/ZA2001/000027
Other languages
French (fr)
Other versions
WO2001064347A3 (en
Inventor
Marcel Albert Rocher
Original Assignee
Multotec Process Equipment (Pty) Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Multotec Process Equipment (Pty) Limited filed Critical Multotec Process Equipment (Pty) Limited
Priority to AU46006/01A priority Critical patent/AU4600601A/en
Publication of WO2001064347A2 publication Critical patent/WO2001064347A2/en
Publication of WO2001064347A3 publication Critical patent/WO2001064347A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
    • B03B5/62—Washing granular, powdered or lumpy materials; Wet separating by hydraulic classifiers, e.g. of launder, tank, spiral or helical chute concentrator type
    • B03B5/626—Helical separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/06—Fibrous reinforcements only
    • B29C70/08—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers
    • B29C70/086—Fibrous reinforcements only comprising combinations of different forms of fibrous reinforcements incorporated in matrix material, forming one or more layers, and with or without non-reinforced layers and with one or more layers of pure plastics material, e.g. foam layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
    • B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2001/00—Articles provided with screw threads
    • B29L2001/007—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/001—Profiled members, e.g. beams, sections
    • B29L2031/008—Profiled members, e.g. beams, sections having a longitudinal cross-section

Definitions

  • This invention relates to a spiral concentrator unit. More particularly but
  • the invention relates to a spiral concentrator unit and a
  • polyurethane is however, its relatively higher cost to that of the more
  • polyurethane has cured, the polyurethane layer is supported with a backing
  • a counter mould may be provided, defining an outer shape of the backing
  • the process may include the steps of locating a fibreglass backing layer
  • the process may include the steps of providing a second
  • the spiral trough may be integrally moulded with a feed and/or a product
  • the feed and/or product box preferably being made of polyurethane.
  • spiral trough may be retrofitted with a feed and/or a
  • the boxes preferably being made of polyethylene or other
  • the first mould may be dimensioned and configured to create a
  • the spiral concentrator unit including a spiral trough
  • the spiral concentrator being
  • Figure 1 is a side view of a spiral concentrator unit in accordance with
  • Figure 2 is a cross-sectional side view of a polyurethane punch
  • figure 1 illustrated in figure 1 includes a centre column (2), a spiral trough (3), a
  • the feed box (4) and the product box (5) are integrally moulded with the
  • the spiral trough (3) includes an inner, high wear resistant layer (3.1) of
  • box could be made of polyurethane, alternatively, polyethylene or any combination thereof
  • the spiral (1) is manufactured in an enclosed moulding process as
  • mould or so-called polyurethane transfer mould (10); providing a counter mould (11), so as to create an enclosed mould cavity (12) between the first
  • the spiral (1) may be manufactured in an enclosed moulding
  • fibreglass matt in the mould cavity filkng the mould cavity with resm (not
  • fibre glass support (3.2) the layers being integrally moulded with the
  • the spiral concentrator unit (1) is integrally moulded with the feed box (4)
  • spiral concentrator unit (1) could be
  • the first mould (10) is dimensioned and configured to create the mould

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Paper (AREA)

Abstract

According to a first aspect of the invention, there is provided a process for manufacturing a spiral concentrator unit including the steps of providing a first mould (10) for moulding an inner, slurry bearing polyurethane layer; providing a fibreglass backing layer (13), located so as to create an enclosed cavity (12) between the first mould and the backing layer; and filling the mould cavity (12) with polyurethane, allowing the polyurethane to cure and bond with the backing layer (13) so as to produce a spiral trough with a uniform, high wear resistant inner layer of polyrethane and a relatively cheaper fibreglass backing layer.

Description

SPIRAL CONCENTRATOR UNIT
Technical Field
This invention relates to a spiral concentrator unit. More particularly but
not exclusively, the invention relates to a spiral concentrator unit and a
method for making such unit.
Background Art
The use of concentrators such as spirals for the separation of minerals such
as heavy minerals, for example gold, is well known. These spirals were
originally made of wood, but are now primarily made of glass fibre and
plastics material More recently, the high wear zones, that is, the zones
where the surfaces of the spiral come into contact with slurry, such as the
inner surface of the spiral trough, the feed box and the product box are
being covered or made of high wear resistant materials such as
polyurethane.
The disadvantage of using high wear resistant materials such as
polyurethane is however, its relatively higher cost to that of the more
common plastics materials such as polyethylene. The feed and the product boxes are conventionally made separately and
then retrofitted, taking into account operational characteristics such as the
required product split, e.g. whether and where the slurry should be
separated into a concentrate, a middlings and/ or a tailings. A disadvantage
of spirals in which the feed and/or product boxes are not integral with the
spiral is the need to retrofit the boxes and the additional polyurethane
required in the high wear zones created because of it.
Spirals are conventionally manufactured manually, typically by applying a
releasing agent to a spiral working mould and subsequently spraying the
mould with a layer of polyurethane to a required thickness. After the
polyurethane has cured, the polyurethane layer is supported with a backing
layer of fibreglass matt and resm which, when cured, is de-moulded The
feed and product boxes are then retrofitted. A disadvantage of the present
manufacturing process is the high rejection ratio of the final products, due
to surface imperfections caused either during the spraying of the
polyurethane layer or during the application of the fibreglass backing. A
further disadvantage of the method of manufacture is that it is time
consuming and labour intensive. An additional disadvantage of the present method of manufacture is the
inability to produce a final product m which the spiral is integral with the
feed and/or product boxes, leading to the associated disadvantage of more
expensive products due to the additional polyurethane as set out above.
Another disadvantage of the present method of manufacture is its relative
inability to control aspects such as the layer thickness of the relatively
expensive polyurethane, the temperature of the polyurethane during
application and curing, the need to use the more expensive spraying
polyurethane than the cheaper castable polyurethane and the rate of
application.
It is accordingly an object of this invention to minimize the above
disadvantages or at least to provide an alternative spiral design and method
of manufacture.
Disclosure of the Invention
A counter mould may be provided, defining an outer shape of the backing
layer.
The process may include the steps of locating a fibreglass backing layer
within the counter mould in a partially cured, pre-impregnated state; and introducing the polyurethane into the cavity between the first mould and
the backing layer, allowing the polyurethane to cure substantially
simultaneously with the fibreglass.
Alternatively, the process may include the steps of providing a second
mould, moulding the fibreglass backing layer in an enclosed mould cavity
between the counter mould and the second mould; substituting the second
mould with the first mould, the latter located proximate to the backing
layer so as to create an enclosed mould cavity between the backing layer
and the first mould,; and filling the mould cavity with polyurethane.
The spiral trough may be integrally moulded with a feed and/or a product
box, the feed and/or product box preferably being made of polyurethane.
Alternatively, the spiral trough may be retrofitted with a feed and/or a
product box, the boxes preferably being made of polyethylene or other
suitable material.
The first mould may be dimensioned and configured to create a
polyurethane mould cavity which provides for a predetermined
polyurethane layer thickness as well as specific polyurethane location while
limiting an oversupply of polyurethane, thus producing the most desirable
but cost effective polyurethane layer. According to a second aspect of the invention there is provided a spiral
concentrator unit manufactured by a process substantially as hereinbefore
defined.
According to a third aspect of the invention there is provided a spiral
concentrator unit being manufactured by a process substantially as
hereinbefore defined, the spiral concentrator unit including a spiral trough,
a feed box and/or a product box, the spiral concentrator being
characterised in that the spiral trough is integrally moulded with the feed
and/or the product box.
Brief Description of the Drawings
A preferred embodiment of the invention will now be described by means
of a non-limit g example only and with reference to the accompanying
drawings wherein :
Figure 1 is a side view of a spiral concentrator unit in accordance with
the invention; and
Figure 2 is a cross-sectional side view of a polyurethane punch and
counter mould arrangement. Please note that the same reference numerals are used to denote
corresponding parts in the accompanying drawings.
Best Mode of Carrying Out the Invention
A spiral concentrator unit (1) in accordance with the invention and as
illustrated in figure 1 includes a centre column (2), a spiral trough (3), a
feed box (4) and a product box (5).
The feed box (4) and the product box (5) are integrally moulded with the
spiral trough (3).
The spiral trough (3) includes an inner, high wear resistant layer (3.1) of
polyurethane, supported by a relatively cheaper fibreglass backing (3.2).
It is envisaged that the feed box (4) and the product box (5) could be
retrofitted to the spiral trough (3) and that such feed box and/or product
box could be made of polyurethane, alternatively, polyethylene or any
other suitable material or combination of materials.
The spiral (1) is manufactured in an enclosed moulding process as
illustrated in Figure 2, the process including the steps of providing a first
mould or so-called polyurethane transfer mould (10); providing a counter mould (11), so as to create an enclosed mould cavity (12) between the first
mould and the counter mould; locating suitable pre-impregnated matt (13)
in the mould cavity; and filling the mould cavity with polyurethane (not
shown), thus allowing the polyurethane to cure to produce a moulded
layered spiral trough with a uniform, high wear resistant inner layer of
polyurethane (3.1) and a relatively cheaper fibreglass support (3.2), the
layers being integrally moulded with the minimum of surface imperfections
on the external surface of the polyurethane inner layer.
Alternatively, the spiral (1) may be manufactured in an enclosed moulding
process as illustrated partially m figures (3) and (4), the process including
the steps of providing a second or so-called resm transfer mould (14);
providing a counter mould (11), for the resm transfer mould so as to create
an enclosed resm mould cavity (13) therebetween; locating suitable
fibreglass matt in the mould cavity; filkng the mould cavity with resm (not
shown) and allowing the resm to cure so as to produce a fibre glass backing
(3.2), substituting the resm transfer mould with a first, polyurethane
transfer mould (10), using the fibre glass backing (3.2) to create an
enclosure polyurethane mould cavity (23) therebetween; and filling the
mould cavity with polyurethane (not shown) and allowing the polyurethane
to cure to produce a moulded layered spiral trough with a uniform, high wear resistant inner layer of polyurethane (3.1) and a relatively cheaper
fibre glass support (3.2), the layers being integrally moulded with the
minimum of surface imperfections on the polyurethane inner surface.
The spiral concentrator unit (1) is integrally moulded with the feed box (4)
and the product box (5), the feed box and the product box being made of
polyurethane.
Alternatively, it is envisaged that the spiral concentrator unit (1) could be
retrofitted to a feed box (4) and a product box (5), the boxes being made
of polyurethane, polyethylene or any other suitable material.
The first mould (10) is dimensioned and configured to create the mould
cavity (12) and (23) which provides for a polyurethane layer thickness,
cured at a predetermined temperature, as well as polyurethane location
while limiting polyurethane oversupply so as to produce the most durable
but cost-effective polyurethane layer (3.1).
It will be appreciated that many variations in detail are possible without
departing from the scope and or spirit of the invention as claimed below,
such as controlling the polyurethane and/or resm temperature, the
polyurethane and/or resm input, etc.

Claims

1. A process for manufacturing a spiral concentrator unit characterised
by including the steps of :
providing a first mould for moulding an inner, slurry bearing
polyurethane layer:
providing a fibreglass backing layer, located and arranged so
as to create an enclosed mould cavity between the first mould
and the backing layer; and
filling the mould cavity7 with polyurethane, allowing the
polyurethane to cure and bond with the fibreglass backing
layer so as to produce a multi- layered spiral trough with a
uniform, high wear resistant inner layer of polyurethane and a
relatively cheaper fibreglass backing layer.
2. A process for manufacturing a spiral concentrator unit as claimed in
claim 1, characterised by including the steps of providing a counter
mould defining an outer shape of the backing layer; locating the fibreglass backing layer in a partially cured, pre-impregnated state
between the first mould and the counter mould; introducing the
polyurethane into the cavity between the first mould and the
backing layer; and allowing the polyurethane to form the high wear
resistant inner layer while curing simultaneously with the fibreglass.
A process for manufacturing a spiral concentrator unit as claimed m
claim 1, characterised by including the steps of providing a second
mould, for moulding the fibreglass backing layer in an enclosed
mould cavity between the second mould and a counter mould;
filling the mould cavity with fibreglass and resm, allowing the resm
to cure; removing the second mould; locating the first mould
proximate to the counter mould with the backing layer retained
therein, so as to create an enclosed mould cavity between the
backing layer and the first mould; and filling the mould cavity with
polyurethane so as to produce the multi-layered spiral trough.
4. A process for manufacturing a spiral concentrator unit as claimed in
claim 1, 2 or 3, characterised by including the step of integrally
moulding the spiral concentrator unit with at least one of a feed and
a product box.
5. A process for manufacturing a spiral concentrator unit as claimed in
claim 4, characterised by manufacturing at least one of the feed and
the product boxes of polyurethane.
6 A process for manufacturing a spiral concentrator unit as claimed in
claim 1, characterised by including the step of retro fitt g the spiral
concentrator unit with at least one of a feed and a product box.
7. A process for manufacturing a spiral concentrator unit as claimed in
claim 6, characterised by manufacturing the spiral concentrator with
at least one of the feed and product boxes of polyurethane.
8. A process for manufacturing a spiral concentrator unit as claimed m
claim 1, characterised by dimensioning and configuring the first
mould to create a polyurethane mould cavity which provides for a
predetermined polyurethane layer thickness as well as specific
polyurethane location while limiting an oversupply of polyurethane,
thus producing the most desirable but cost effective polyurethane
layer.
A spiral concentrator unit characterised by being manufactured by a
process including the steps of:
providing a first mould for moulding an inner, slurry bearing
polyurethane layer;
providing a fibreglass backing layer, located and arranged so
as to create an enclosed mould cavity between the first mould
and the backing layer; and
- filling the mould cavity with polyurethane, allowing the
polyurethane to cure and bond with the fibreglass backing
layer so as to produce a multi-layered spiral trough with a
uniform, high wear resistant inner layer of polyurethane and
a relatively cheaper fibreglass backing layer.
10. A spiral concentrator unit having a spiral trough, a feed box and a
product box, the spiral concentrator being characterised in that the
spiral trough is integrally moulded with at least one of the feed and
the product boxes.
1. A spiral concentrator unit as claimed n claim 10 characterised in
having an integrally moulded multi-layered spiral trough with a
uniform high wear resistant inner, slurry bearing layer of
polyurethane and a relatively cheaper fibreglass backing layer.
PCT/ZA2001/000027 2000-03-02 2001-03-02 Spiral concentrator unit WO2001064347A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU46006/01A AU4600601A (en) 2000-03-02 2001-03-02 Spiral concentrator unit

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ZA99/6471 2000-03-02
ZA2000/0117 2000-03-02
ZA200000117 2000-03-02
ZA996471 2000-03-02

Publications (2)

Publication Number Publication Date
WO2001064347A2 true WO2001064347A2 (en) 2001-09-07
WO2001064347A3 WO2001064347A3 (en) 2002-02-21

Family

ID=27145394

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2001/000027 WO2001064347A2 (en) 2000-03-02 2001-03-02 Spiral concentrator unit

Country Status (2)

Country Link
AU (1) AU4600601A (en)
WO (1) WO2001064347A2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008056024A1 (en) * 2006-11-08 2008-05-15 Outotec Oyj Method for making spiral separators
WO2009136002A1 (en) * 2008-05-08 2009-11-12 Outotec Oyj Method and apparatus for making spiral separators using sequential heating and cooling
CN108357035A (en) * 2018-02-02 2018-08-03 广州市华英防腐设备有限公司 A kind of spiral chute mold and its application method
CN112275441A (en) * 2020-09-15 2021-01-29 江西铭鑫冶金设备有限公司 Spiral chute made of crushed resin powder of waste printed circuit board and manufacturing process of spiral chute
WO2021119718A1 (en) * 2019-12-20 2021-06-24 Orekinetics Investments Pty Ltd Manufacturing method and spiral trough element

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB918933A (en) * 1960-08-25 1963-02-20 Nat Res Dev Improvements relating to moulding of reinforced polyester resin articles
GB2100624B (en) * 1981-07-03 1985-07-03 Inheed Pty Ltd Spiral separators
FR2513567A1 (en) * 1981-09-30 1983-04-01 Peugeot Aciers Et Outillage Composite comprising reinforced epoxy! resin - over-moulded with polyurethane, having high mechanical and thermal resistance, for prodn. of automobile parts
AU4416385A (en) * 1984-06-25 1986-01-02 Minpro Pty. Limited Moulded spiral
US4731270A (en) * 1986-06-16 1988-03-15 Kent Edward W Laminated trough for a spiral concentrator and process for construction of same
ZA895958B (en) * 1989-03-09 1990-05-30 Jurgens Grobler Hans Mineral separation equipment manufacturing method
GB9417678D0 (en) * 1994-09-02 1994-10-19 Univ Warwick A method of producing a scratch resistant coating on a plastics substrate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008056024A1 (en) * 2006-11-08 2008-05-15 Outotec Oyj Method for making spiral separators
WO2009136002A1 (en) * 2008-05-08 2009-11-12 Outotec Oyj Method and apparatus for making spiral separators using sequential heating and cooling
CN108357035A (en) * 2018-02-02 2018-08-03 广州市华英防腐设备有限公司 A kind of spiral chute mold and its application method
CN108357035B (en) * 2018-02-02 2023-10-03 广州市华英防腐设备有限公司 Spiral chute mold and use method thereof
WO2021119718A1 (en) * 2019-12-20 2021-06-24 Orekinetics Investments Pty Ltd Manufacturing method and spiral trough element
CN112275441A (en) * 2020-09-15 2021-01-29 江西铭鑫冶金设备有限公司 Spiral chute made of crushed resin powder of waste printed circuit board and manufacturing process of spiral chute

Also Published As

Publication number Publication date
WO2001064347A3 (en) 2002-02-21
AU4600601A (en) 2001-09-12

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