WO2018172865A1 - An infeed plant for a mill - Google Patents

An infeed plant for a mill Download PDF

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Publication number
WO2018172865A1
WO2018172865A1 PCT/IB2018/050992 IB2018050992W WO2018172865A1 WO 2018172865 A1 WO2018172865 A1 WO 2018172865A1 IB 2018050992 W IB2018050992 W IB 2018050992W WO 2018172865 A1 WO2018172865 A1 WO 2018172865A1
Authority
WO
WIPO (PCT)
Prior art keywords
mill
ceramic material
infeed
plant according
mixer
Prior art date
Application number
PCT/IB2018/050992
Other languages
French (fr)
Inventor
Valter PALLADINI
Original Assignee
Certech S.P.A. A Socio Unico
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 Certech S.P.A. A Socio Unico filed Critical Certech S.P.A. A Socio Unico
Publication of WO2018172865A1 publication Critical patent/WO2018172865A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices

Definitions

  • the present invention relates to an infeed plant for mills.
  • mills grind the ceramic materials in order to reduce the granulometry thereof to a predetermined size.
  • the ceramic materials processed internally of mills are constituted by differing mixtures of various minerals, among which for example clay, quartz and feldspars.
  • composition of the mixture can be different in terms of percentage content of each constituent.
  • the infeed plants for mills include the separate introduction of the various components of the mixture to be milled, in the predetermined quantities.
  • the infeed plants comprise a plurality of weighing hoppers, destined to unload a predetermined quantity of one of the components of the mixture on a conveyor device.
  • the conveyor device or devices then proceed to carry the various components internally of the mill.
  • the mill Upon reaching the desired load, the mill is started up to complete the milling process.
  • the mill consumes significant amounts of energy for starting up and continuing to rotate. There is therefore a need to reduce, as much as possible, the operating time of the mill necessary for obtaining the milling of the mixture to the sought granulometry.
  • the present invention therefore has the aim of enabling a significant reduction, with respect to the present state of the art, of the operating times of the mill required in order to obtain the milling of the mixture to the required granulometry. Characteristics and advantages of the present invention will more fully emerge from the following detailed description of an embodiment of the invention, as illustrated in a non-limiting example in the accompanying drawings, in which:
  • FIG. 1 is a schematic view of a first embodiment of the infeed plant according to the present invention.
  • figure 2 is a schematic view of a second embodiment of the infeed plant according to the present invention.
  • figure 3 is a view from the right of the plant of figure 1 .
  • the infeed plant for a mill (20) comprises a conveyor device (12, 13), predisposed for receiving in inlet a predetermined quantity of ceramic material and for carrying the ceramic material to a mill (20).
  • the conveyor device comprises a first portion (12) and a second portion (13).
  • the conveyor device comprises one or more conveyor belts, provided with lateral borders.
  • the first and the second portion (12, 13) each comprise a conveyor belt.
  • the infeed plant advantageously comprises a mixer device (10), predisposed for receiving the load and mixing or blending the ceramic material, prior to introduction thereof into the mill (20).
  • the mixer device (10) is located along the conveyor device (12, 13).
  • the first portion (12) feeds the ceramic material to the mixer (10), while the second portion (12) is interposed between the mixer (10) and the mill (20), so as to receive the mixed ceramic material in order to carry it towards the mill (20).
  • the ceramic material is then mixed or blended homogeneously internally of the mixer device (10) before entering the mill (20). This enables a significant reduction of the times necessary for obtaining the desired milling of the material.
  • the various components of the mixture arrive separately internally of the mill (20), and it is the mill which, for the aim of obtaining an equally-uniform milling, must use a not-negligible part of the rotations thereof for uniformly mixing the material
  • the mill (20) receives the composition of ceramic materials already uniformly mixed, so that the real milling action can start immediately and be completed in a substantially shorter time than with the present plants.
  • the various components forming the desired mixture of ceramic materials can be fed to the conveyor device (12, 13) in the predetermined quantities, either simultaneously or in succession. In both cases, the various components flow into the mixer device (10) and are mixed or blended with one another in a uniform manner. Once obtained the predetermined degree of mixing or blending of the various components, the ceramic material can be fed to the mill (20).
  • the mixer device (10) comprises a containing casing (10a) for the ceramic material and a rotating mixing member, located internally of the containing casing.
  • the blending action carried out by the rotating mixing member is notably more effective that the blending that can be obtained with the rotation of the mill, and therefore, given a same degree of homogenisation, the time required by the mixer device (10) is much shorter than the time required by the mill.
  • the rotating mixing member has a much lower mass than that of the mill, and therefore the energy required for activating the mixer device (10) is significantly lower than the energy required for rotation of the mill.
  • the mixing member has a helical conformation, as schematically illustrated in figure 1 .
  • the mixing member comprises a rotating shaft (10b) provided with paddles or blades which extend along a radial direction.
  • the paddles or blades are directly associated to the containing casing and project internally thereof.
  • the containing casing can be activated in rotation by a dedicated motor.
  • the rotation axis of the mixing member can be vertical, horizontal, or can be inclined in another way.
  • the infeed plant according to the present invention can advantageously be provided with a batching device (1 1 ), predisposed for depositing on the conveyor device (12, 13) a predetermined quantity of ceramic material to be introduced into the mixer device (10).
  • a certain component can be progressively introduced into the batching device (1 1 ), up to reaching the predetermined quantity.
  • the batching device (1 1 ) can indicate that the predetermined quantity has been reached, so as to halt introduction of the component and, subsequently, can unload the material onto the conveyor device (1 2, 13), in particular on the first portion (12), as illustrated in the figures.
  • the batching device (1 1 ) for example, comprises a batching hopper known in the field, and for this reason it is not illustrated in detail.
  • the introduction of the component of the ceramic mixture can be carried out by means of a self-propelling blade, as commonly occurs in present plants.
  • the plant can be provided with a storage container (14), arranged downstream of the conveyor device (12, 13), for receiving and containing the ceramic material in outlet from the mixer device (10).
  • the storage container (14) substantially enables freeing the production cycle of the mixer device (10) from the production cycle of the mill (20).
  • the plant can be provided with a plurality of storage containers (14), each of which can be destined to contain a different composition of ceramic materials. This enables, where required, effectively managing the separate milling of the various compositions.
  • a feeder (15) can be interposed between the storage container (14) and the mill (20) for transferring the ceramic material from the storage container(s) (14) to the mill (20).
  • the feeder (15) can be provided with a motorised screw, rotating internally of a conduit the opening of which is located internally or above an infeed opening of the mill (20). In this way the loading of the mill (20) can be managed automatically, acting on the motor of the screw.
  • the infeed plant for mills of the present invention enables obtaining important advantages.
  • a mixer device (10) for mixing or blending the composition of ceramic materials before the introduction thereof into the mill (20) enables a drastic reduction in the operating times of the mill (20). This is because the mill (20) receives a composition that has been previously homogenised, so that the milling action can begin immediately and terminate more rapidly with respect to what happens in present plants, in which the mixing action of the ceramic material, which takes place internally of the mill (20), significantly slows the milling action of the mill (20).

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

An infeed plant for a mill (20), comprising: a conveyor device (12, 13), predisposed for receiving in inlet a predetermined quantity of ceramic material and for carrying the ceramic material to a mill (20); a mixer device (10), predisposed for receiving the load and mixing or blending the ceramic material, prior to introduction thereof into the mill (20).

Description

An infeed plant for a mill
DESCRIPTION
The present invention relates to an infeed plant for mills.
In preparation of raw materials for the ceramic industry, wide use is made of mills of the continuous type and the discontinuous type.
As is known, mills grind the ceramic materials in order to reduce the granulometry thereof to a predetermined size.
In general, the ceramic materials processed internally of mills are constituted by differing mixtures of various minerals, among which for example clay, quartz and feldspars.
According to the intended use, the composition of the mixture can be different in terms of percentage content of each constituent.
At present, the infeed plants for mills include the separate introduction of the various components of the mixture to be milled, in the predetermined quantities. For this purpose, the infeed plants comprise a plurality of weighing hoppers, destined to unload a predetermined quantity of one of the components of the mixture on a conveyor device. The conveyor device or devices then proceed to carry the various components internally of the mill. Upon reaching the desired load, the mill is started up to complete the milling process.
As this is a device provided with a rather high mass, especially in loading conditions, the mill consumes significant amounts of energy for starting up and continuing to rotate. There is therefore a need to reduce, as much as possible, the operating time of the mill necessary for obtaining the milling of the mixture to the sought granulometry.
The present invention therefore has the aim of enabling a significant reduction, with respect to the present state of the art, of the operating times of the mill required in order to obtain the milling of the mixture to the required granulometry. Characteristics and advantages of the present invention will more fully emerge from the following detailed description of an embodiment of the invention, as illustrated in a non-limiting example in the accompanying drawings, in which:
- figure 1 is a schematic view of a first embodiment of the infeed plant according to the present invention;
figure 2 is a schematic view of a second embodiment of the infeed plant according to the present invention;
figure 3 is a view from the right of the plant of figure 1 .
The infeed plant for a mill (20) according to the present invention comprises a conveyor device (12, 13), predisposed for receiving in inlet a predetermined quantity of ceramic material and for carrying the ceramic material to a mill (20).
In the illustrated embodiment, the conveyor device comprises a first portion (12) and a second portion (13). For example, the conveyor device comprises one or more conveyor belts, provided with lateral borders. In the illustrated embodiment, the first and the second portion (12, 13) each comprise a conveyor belt.
The infeed plant advantageously comprises a mixer device (10), predisposed for receiving the load and mixing or blending the ceramic material, prior to introduction thereof into the mill (20).
In the illustrated embodiment, the mixer device (10) is located along the conveyor device (12, 13). In particular, the first portion (12) feeds the ceramic material to the mixer (10), while the second portion (12) is interposed between the mixer (10) and the mill (20), so as to receive the mixed ceramic material in order to carry it towards the mill (20).
The ceramic material is then mixed or blended homogeneously internally of the mixer device (10) before entering the mill (20). This enables a significant reduction of the times necessary for obtaining the desired milling of the material. In fact, while in plants at present available the various components of the mixture arrive separately internally of the mill (20), and it is the mill which, for the aim of obtaining an equally-uniform milling, must use a not-negligible part of the rotations thereof for uniformly mixing the material, in the plant of the present invention the mill (20) receives the composition of ceramic materials already uniformly mixed, so that the real milling action can start immediately and be completed in a substantially shorter time than with the present plants.
The various components forming the desired mixture of ceramic materials can be fed to the conveyor device (12, 13) in the predetermined quantities, either simultaneously or in succession. In both cases, the various components flow into the mixer device (10) and are mixed or blended with one another in a uniform manner. Once obtained the predetermined degree of mixing or blending of the various components, the ceramic material can be fed to the mill (20).
In a possible but not exclusive embodiment, the mixer device (10) comprises a containing casing (10a) for the ceramic material and a rotating mixing member, located internally of the containing casing. The blending action carried out by the rotating mixing member is notably more effective that the blending that can be obtained with the rotation of the mill, and therefore, given a same degree of homogenisation, the time required by the mixer device (10) is much shorter than the time required by the mill. Further, the rotating mixing member has a much lower mass than that of the mill, and therefore the energy required for activating the mixer device (10) is significantly lower than the energy required for rotation of the mill. In a possible embodiment, the mixing member has a helical conformation, as schematically illustrated in figure 1 . In a further possible embodiment, the mixing member comprises a rotating shaft (10b) provided with paddles or blades which extend along a radial direction. In a further possible embodiment, illustrated in figure 2, the paddles or blades are directly associated to the containing casing and project internally thereof. The containing casing can be activated in rotation by a dedicated motor. The rotation axis of the mixing member can be vertical, horizontal, or can be inclined in another way.
The infeed plant according to the present invention can advantageously be provided with a batching device (1 1 ), predisposed for depositing on the conveyor device (12, 13) a predetermined quantity of ceramic material to be introduced into the mixer device (10). For example, a certain component can be progressively introduced into the batching device (1 1 ), up to reaching the predetermined quantity. At this point, the batching device (1 1 ) can indicate that the predetermined quantity has been reached, so as to halt introduction of the component and, subsequently, can unload the material onto the conveyor device (1 2, 13), in particular on the first portion (12), as illustrated in the figures.
The batching device (1 1 ), for example, comprises a batching hopper known in the field, and for this reason it is not illustrated in detail. The introduction of the component of the ceramic mixture can be carried out by means of a self-propelling blade, as commonly occurs in present plants.
Further, the plant can be provided with a storage container (14), arranged downstream of the conveyor device (12, 13), for receiving and containing the ceramic material in outlet from the mixer device (10). The storage container (14) substantially enables freeing the production cycle of the mixer device (10) from the production cycle of the mill (20). The plant can be provided with a plurality of storage containers (14), each of which can be destined to contain a different composition of ceramic materials. This enables, where required, effectively managing the separate milling of the various compositions.
A feeder (15) can be interposed between the storage container (14) and the mill (20) for transferring the ceramic material from the storage container(s) (14) to the mill (20). The feeder (15) can be provided with a motorised screw, rotating internally of a conduit the opening of which is located internally or above an infeed opening of the mill (20). In this way the loading of the mill (20) can be managed automatically, acting on the motor of the screw. The infeed plant for mills of the present invention enables obtaining important advantages.
As already highlighted, the inclusion of a mixer device (10) for mixing or blending the composition of ceramic materials before the introduction thereof into the mill (20) enables a drastic reduction in the operating times of the mill (20). This is because the mill (20) receives a composition that has been previously homogenised, so that the milling action can begin immediately and terminate more rapidly with respect to what happens in present plants, in which the mixing action of the ceramic material, which takes place internally of the mill (20), significantly slows the milling action of the mill (20).

Claims

1 . An infeed plant for a mill (20), comprising a conveyor device (12, 13), predisposed for receiving in inlet a predetermined quantity of ceramic material and for carrying the ceramic material to a mill (20), characterised in that it comprises: a mixer device (10), predisposed for receiving the load and mixing or blending the ceramic material, prior to introduction thereof into the mill (20).
2. The infeed plant according to claim 1 , wherein the mixer device (10) comprises a containing casing for the ceramic material and a rotating mixing member, located internally of the containing casing.
3. The infeed plant according to claim 2, wherein the mixing member has a helical conformation.
4. The infeed plant according to claim 2, wherein the mixing member comprises a rotating shaft provided with paddles or blades which extend along a radial direction.
5. The infeed plant according to claim 1 , wherein the mixer device (10) is located along the conveyor device (12,13).
6. The infeed plant according to claim 2, wherein the conveyor device (12.13) comprises a first portion (12), which feeds the ceramic material to the mixer (10), and a second portion (12), interposed between the mixer
(10) and the mill (20), on which second portion the mixer device (10) unloads the mixed or blended ceramic material.
7. The infeed plant according to claim 1 , comprising a batching device
(1 1 ) , predisposed for depositing on the conveyor device (12,13) a predetermined quantity of ceramic material to be introduced into the mixer device (10).
8. The infeed plant according to claim 1 , comprising a storage container (14), arranged downstream of the conveyor device (12,13), predisposed for receiving and containing the ceramic material in outfeed from the mixer device (10).
9. The infeed plant according to claim 8, comprising a feeder (15) interposed between the storage container (14) and the mill (20) for transferring the ceramic material from the storage container (14) to the mill (20).
10. The infeed plant according to claim 1 , wherein the conveyor device (12,13) comprises one or more conveyor belts.
PCT/IB2018/050992 2017-03-24 2018-02-19 An infeed plant for a mill WO2018172865A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000032848A IT201700032848A1 (en) 2017-03-24 2017-03-24 Feeding plant for mills
IT102017000032848 2017-03-24

Publications (1)

Publication Number Publication Date
WO2018172865A1 true WO2018172865A1 (en) 2018-09-27

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PCT/IB2018/050992 WO2018172865A1 (en) 2017-03-24 2018-02-19 An infeed plant for a mill

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WO (1) WO2018172865A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1395198A (en) * 1972-08-30 1975-05-21 Messer Griesheim Gmbh Method of and apparatus for grinding materials
DE9012454U1 (en) * 1990-08-31 1992-01-02 Kopf-Bau Gmbh, 8453 Vilseck, De
US5251383A (en) * 1992-07-06 1993-10-12 Williams Robert M Apparatus for and a method of disposing of wet sludge
DE19536657A1 (en) * 1995-09-30 1997-04-10 Metallgesellschaft Ag Process for the production of Ti0¶2¶ pigments from Ti0¶2¶ clinker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1395198A (en) * 1972-08-30 1975-05-21 Messer Griesheim Gmbh Method of and apparatus for grinding materials
DE9012454U1 (en) * 1990-08-31 1992-01-02 Kopf-Bau Gmbh, 8453 Vilseck, De
US5251383A (en) * 1992-07-06 1993-10-12 Williams Robert M Apparatus for and a method of disposing of wet sludge
DE19536657A1 (en) * 1995-09-30 1997-04-10 Metallgesellschaft Ag Process for the production of Ti0¶2¶ pigments from Ti0¶2¶ clinker

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