EP1118386A1 - Improved apparatus for finely milling and/or finely suspending substances in liquids - Google Patents
Improved apparatus for finely milling and/or finely suspending substances in liquids Download PDFInfo
- Publication number
- EP1118386A1 EP1118386A1 EP00830031A EP00830031A EP1118386A1 EP 1118386 A1 EP1118386 A1 EP 1118386A1 EP 00830031 A EP00830031 A EP 00830031A EP 00830031 A EP00830031 A EP 00830031A EP 1118386 A1 EP1118386 A1 EP 1118386A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- finely
- liquids
- milling
- ultrasonic
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
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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
- B02C19/00—Other disintegrating devices or methods
- B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
Definitions
- Apparatus for suspending solids in liquids are taught in the prior art, in particular in the field of production of suspended organic and inorganic pigments.
- These apparatus are usually discontinuously operated and, very briefly, comprise a container for containing the substances and components, in which the dissolving is done, very often in vacuum conditions, by mechanical stirring groups as well as special indented rotors set in rotation.
- the degree of suspension influences numerous properties, such as chromatic characteristics, rheological flow characteristics, behavioural characteristics and chemical affinity in mixtures with other products; not to forget stability over a period of time and degree of gloss or matt finish.
- the main aim of the present invention is to obviate the limitations and drawbacks in the prior art in order to obtain high-concentrate suspensions of solids in liquids, characterised by great stability and an extremely homogeneous distribution, including from the point of view of granulometry, of the solid in the liquid carrier.
- Another main aim is to obtain a liquid/liquid dispersion which is perfectly homogenous, free of microfoam and stable over a period of time.
- Advantages of the invention are that it does not require great use of surface-active agents, it achieves an excellent separation of solid powder aggregates and does not lead to a high wastage of mechanical energy transmitted via rotating organs (rotors) which, in known applications, create high chemical-physical stress in the suspension and resulting solution.
- a further advantage of the invention is that the processes of grinding or milling are much quicker.
- 1 denotes in its entirety a container which is destined to contain a fluid mass constituted by a mixture of a solid suspended in a liquid.
- the container 1 is the shell comprising a lower refining chamber 10 and an upper chamber 11 of a ball mill 3 used in particular for refining or fine grinding of silk-screening glazes and, more in general, for the suspension of solids in liquids.
- the lower refining chamber 10 contains the milling balls, which balls grind when moved by the mechanical rotating action of the shaft 12, which shaft 12 is provided with rotors.
- a similar apparatus to the above-described one is constituted by the mill 3' of figure 3, in which the balls are contained in a basket 14 which is solidly constrained to a lid covering the container 1 which will contain a fluid mass constituted by a mixture of a solid in a liquid.
- Figure 4 schematically represents a mixer the function of which is solely that of causing an already at least quite finely-ground solid to disperse without rendering the solid even more finely-ground.
- the dispersion of the solid is achieved by a mechanical mixing action on the part of a rotor 5 which, immersed in the mass, is rapidly rotated.
- All of the illustrated embodiments exhibit a container 1 to which lateral walls (which have an overall axial-symmetric conformation) two ultrasonic generators 2, in the form of plates, are applied at peripheral positions.
- These ultrasonic generators 2 have the specific function of transmitting energy at ultrasonic frequency to the mass contained in the container 1.
- the ultrasonically-emitted energy which can be modulated and regulated according to needs, exerts a direct dispersant action on the solids in the liquid, exploiting the ability of this form of energy to propagate easily in a liquid carrier.
- the transmission of ultrasonic energy preferably in a frequency range comprised between 5 and 70 kHz, has the effect of increasing the contact surface between solid particles and the liquid, favouring wetting.
- ultrasound which is preferably done at constant frequencies, also activates and optimizes the process of homogenization of the surface-active agents and/or dispersants, This permits production of mixtures with higher concentrations of suspended solids with smaller quantities of surface-active agents, with a consequent reduction in the formation of microfoam, which leads to suspension instability.
- solids for example, mineral-rich, synthetic, organic and inorganic pigments, colouring earths
- solids can be dispersed in liquids and produce a mixture characterised by a high concentration of solid and a good level of chemical-physical stability over time, leading to ease of use.
- a Further advantage of the invention is constituted by an improvement in the chromatic quality of the products.
- All of the described realisations employ an improved process for finely milling and/or finely dispersing solids in liquids or liquids in liquids, which is essentially characterised by the fact that energy is transmitted in the form of ultrasonic waves to the mass of solids and liquids during the milling of the former and also during the dispersion of one in the other, or of liquids in liquids.
Abstract
Description
- Apparatus for suspending solids in liquids are taught in the prior art, in particular in the field of production of suspended organic and inorganic pigments. These apparatus are usually discontinuously operated and, very briefly, comprise a container for containing the substances and components, in which the dissolving is done, very often in vacuum conditions, by mechanical stirring groups as well as special indented rotors set in rotation.
- Also known are other apparatus (mills) which wet-mill solid components mixed with liquids.
- For numerous production applications such as, for example, production of pigment suspensions, it is of fundamental importance that stable suspensions be produced, with high solid suspension content.
- The degree of suspension influences numerous properties, such as chromatic characteristics, rheological flow characteristics, behavioural characteristics and chemical affinity in mixtures with other products; not to forget stability over a period of time and degree of gloss or matt finish.
- In relation to the above-mentioned characteristics, known realisations exhibit several limitations which appear to be constitutional or organic, in the sense that the results obtainable are not improvable, even by considerably increasing treatment times (for example, in the case of mills, greatly increasing milling time).
- A similar limitation exists in relation to the mass of solid which can be dispersed sufficiently stably in a determined mass of liquid.
- The main aim of the present invention is to obviate the limitations and drawbacks in the prior art in order to obtain high-concentrate suspensions of solids in liquids, characterised by great stability and an extremely homogeneous distribution, including from the point of view of granulometry, of the solid in the liquid carrier. Another main aim is to obtain a liquid/liquid dispersion which is perfectly homogenous, free of microfoam and stable over a period of time.
- Advantages of the invention are that it does not require great use of surface-active agents, it achieves an excellent separation of solid powder aggregates and does not lead to a high wastage of mechanical energy transmitted via rotating organs (rotors) which, in known applications, create high chemical-physical stress in the suspension and resulting solution.
- A further advantage of the invention is that the processes of grinding or milling are much quicker.
- These aims and advantages and others besides are all attained by the invention as it is characterised in the appended claims.
- Further characteristics and advantages of the present invention will better emerge from the detailed description that follows of some preferred but non-exclusive embodiments of the invention, illustrated purely by way of nonlimiting examples in the accompanying figures of the drawings, in which:
- figure 1 shows a schematic section made according to line I-I of figure 2, relating to a first embodiment of the invention;
- figure 2 is a schematic lateral view from the left of figure 1;
- figure 3 is a schematic median section according to a vertical plane of a second embodiment of the invention;
- figure 4 is a schematic median section according to a vertical plane of a further embodiment of the invention.
-
- With reference to the figures of the drawings, 1 denotes in its entirety a container which is destined to contain a fluid mass constituted by a mixture of a solid suspended in a liquid.
- In the embodiment shown in figures 1 and 2, the container 1 is the shell comprising a lower refining chamber 10 and an
upper chamber 11 of aball mill 3 used in particular for refining or fine grinding of silk-screening glazes and, more in general, for the suspension of solids in liquids. - The lower refining chamber 10 contains the milling balls, which balls grind when moved by the mechanical rotating action of the
shaft 12, whichshaft 12 is provided with rotors. - A similar apparatus to the above-described one is constituted by the mill 3' of figure 3, in which the balls are contained in a
basket 14 which is solidly constrained to a lid covering the container 1 which will contain a fluid mass constituted by a mixture of a solid in a liquid. - Figure 4 schematically represents a mixer the function of which is solely that of causing an already at least quite finely-ground solid to disperse without rendering the solid even more finely-ground. The dispersion of the solid is achieved by a mechanical mixing action on the part of a rotor 5 which, immersed in the mass, is rapidly rotated.
- All of the illustrated embodiments exhibit a container 1 to which lateral walls (which have an overall axial-symmetric conformation) two ultrasonic generators 2, in the form of plates, are applied at peripheral positions.
- Other embodiments could involve a different number of ultrasonic generators 2.
- These ultrasonic generators 2 have the specific function of transmitting energy at ultrasonic frequency to the mass contained in the container 1.
- The ultrasonically-emitted energy, which can be modulated and regulated according to needs, exerts a direct dispersant action on the solids in the liquid, exploiting the ability of this form of energy to propagate easily in a liquid carrier.
- The transmission of ultrasonic energy, preferably in a frequency range comprised between 5 and 70 kHz, has the effect of increasing the contact surface between solid particles and the liquid, favouring wetting.
- In addition to the above, a process of cavitation occurs, which enables efficient expulsion of the air produced during the mechanical diffusion of the solid in the liquid.
- This condition, together with the vacuum action created by the machine and a careful control of the temperature, creates optimal conditions for deagglomeration of clumps and micronisation of the solid particles. This leads to a very high percentage of suspended solids, a level which is certainly not obtainable using traditional systems which do not use ultrasonic techniques, without any ensuing problems connected with rheological high viscosity factors, which would render the resulting suspensions unusable.
- Furthermore, in comparison to the prior art, the processes of breaking-up and micronisation are significantly accelerated.
- The use of ultrasound, which is preferably done at constant frequencies, also activates and optimizes the process of homogenization of the surface-active agents and/or dispersants, This permits production of mixtures with higher concentrations of suspended solids with smaller quantities of surface-active agents, with a consequent reduction in the formation of microfoam, which leads to suspension instability.
- Thus solids (for example, mineral-rich, synthetic, organic and inorganic pigments, colouring earths) can be dispersed in liquids and produce a mixture characterised by a high concentration of solid and a good level of chemical-physical stability over time, leading to ease of use.
- A Further advantage of the invention is constituted by an improvement in the chromatic quality of the products.
- All of the described realisations employ an improved process for finely milling and/or finely dispersing solids in liquids or liquids in liquids, which is essentially characterised by the fact that energy is transmitted in the form of ultrasonic waves to the mass of solids and liquids during the milling of the former and also during the dispersion of one in the other, or of liquids in liquids.
Claims (9)
- An improved apparatus for finely milling and/or finely suspending substances in liquids, comprising a container (1) in which milling is performed and/or dispersion is performed by mechanical organs, characterised in that it comprises at least one ultrasonic generator (2) for transmitting ultrasonic waves to a mass contained in the container (1).
- The apparatus of claim 1, characterised in that the at least one ultrasonic generator (2) is associated to a wall of the container (1).
- The apparatus of claim 2, characterised in that it comprises at least two of said at least one ultrasonic generator (2), associated to walls of the container (1) at peripheral positions.
- The apparatus of claim 3, characterised in that at least the walls of the container (1) to which the ultrasonic generators (2) are peripherally associated have an axial-symmetric conformation.
- The apparatus of claim 4, characterised in that the container (1) comprises at least one chamber of a ball-mill (3, 3') containing milling balls.
- The apparatus of claim 4, characterised in that the container (1) comprises at least one chamber of a mixer (4) internally of which at least one rotor (5) operates.
- The apparatus of claim 5 or 6, characterised in that the container (1) is provided with a lid which guarantees sealed closure of the container (1) during operation thereof in depression.
- The apparatus of claim 7, characterised in that the ultrasonic generators (2) can be adjusted to enable regulation and modulation of energy emitted.
- An improved apparatus for finely milling and/or finely suspending substances in liquids, characterised in that energy is transmitted in ultrasonic waves to a mass of solids and liquids during milling and/or during dispersion of the substances in liquids.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00830031A EP1118386A1 (en) | 2000-01-20 | 2000-01-20 | Improved apparatus for finely milling and/or finely suspending substances in liquids |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00830031A EP1118386A1 (en) | 2000-01-20 | 2000-01-20 | Improved apparatus for finely milling and/or finely suspending substances in liquids |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1118386A1 true EP1118386A1 (en) | 2001-07-25 |
Family
ID=8175137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00830031A Withdrawn EP1118386A1 (en) | 2000-01-20 | 2000-01-20 | Improved apparatus for finely milling and/or finely suspending substances in liquids |
Country Status (1)
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EP (1) | EP1118386A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103521763A (en) * | 2013-11-01 | 2014-01-22 | 赣州中瑞材料科技有限公司 | Process for preparing superfine tungsten-base alloy powder by microwave-assisted ball-milling |
CN103785511A (en) * | 2014-03-04 | 2014-05-14 | 湖南大学 | Microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder |
CN109465462A (en) * | 2018-12-17 | 2019-03-15 | 河源富马硬质合金股份有限公司 | A kind of new ball milling method prepares hard alloy |
CN114029129A (en) * | 2021-11-13 | 2022-02-11 | 淄博大力矿山机械有限公司 | Building materials cornmill |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1254001B (en) * | 1964-04-07 | 1967-11-09 | Draiswerke Ges Mit Beschraenkt | Agitator mill |
DE1507528B1 (en) * | 1966-12-06 | 1970-09-24 | Fryma Masch Ag | Device for processing and preparing flowable products |
EP0065188A2 (en) * | 1981-05-14 | 1982-11-24 | BASF Aktiengesellschaft | Separating device for separating grinding bodies and a ground suspension in a wet-grinding machine |
US4964576A (en) * | 1988-04-04 | 1990-10-23 | Datta Rabinder S | Method and apparatus for mineral matter separation |
US5279463A (en) * | 1992-08-26 | 1994-01-18 | Holl Richard A | Methods and apparatus for treating materials in liquids |
EP0686428A1 (en) * | 1994-06-10 | 1995-12-13 | Eastman Kodak Company | Micro media mill and method of its use |
-
2000
- 2000-01-20 EP EP00830031A patent/EP1118386A1/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1254001B (en) * | 1964-04-07 | 1967-11-09 | Draiswerke Ges Mit Beschraenkt | Agitator mill |
DE1507528B1 (en) * | 1966-12-06 | 1970-09-24 | Fryma Masch Ag | Device for processing and preparing flowable products |
EP0065188A2 (en) * | 1981-05-14 | 1982-11-24 | BASF Aktiengesellschaft | Separating device for separating grinding bodies and a ground suspension in a wet-grinding machine |
US4964576A (en) * | 1988-04-04 | 1990-10-23 | Datta Rabinder S | Method and apparatus for mineral matter separation |
US5279463A (en) * | 1992-08-26 | 1994-01-18 | Holl Richard A | Methods and apparatus for treating materials in liquids |
EP0686428A1 (en) * | 1994-06-10 | 1995-12-13 | Eastman Kodak Company | Micro media mill and method of its use |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103521763A (en) * | 2013-11-01 | 2014-01-22 | 赣州中瑞材料科技有限公司 | Process for preparing superfine tungsten-base alloy powder by microwave-assisted ball-milling |
CN103785511A (en) * | 2014-03-04 | 2014-05-14 | 湖南大学 | Microwave and ultrasound combined assisted ball-milling device and process for preparing high-performance nanopowder |
CN103785511B (en) * | 2014-03-04 | 2016-02-24 | 湖南大学 | A kind of microwave ultrasound associating auxiliary ball mill apparatus and technique preparing high-performance nano powder |
CN109465462A (en) * | 2018-12-17 | 2019-03-15 | 河源富马硬质合金股份有限公司 | A kind of new ball milling method prepares hard alloy |
CN114029129A (en) * | 2021-11-13 | 2022-02-11 | 淄博大力矿山机械有限公司 | Building materials cornmill |
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