WO2001049417A1 - Rotary mill - Google Patents
Rotary mill Download PDFInfo
- Publication number
- WO2001049417A1 WO2001049417A1 PCT/CA2000/000002 CA0000002W WO0149417A1 WO 2001049417 A1 WO2001049417 A1 WO 2001049417A1 CA 0000002 W CA0000002 W CA 0000002W WO 0149417 A1 WO0149417 A1 WO 0149417A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- particles
- impact
- rotor
- impact chamber
- Prior art date
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
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
- B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
- B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
- B02C13/26—Details
- B02C13/288—Ventilating, or influencing air circulation
Definitions
- the present invention relates to an apparatus for ore milling. More specifically, the present invention relates to a rotary mill for impact reduction of ore.
- US Patent 3,887,141 teaches a mill for the reduction of ore that uses an impact rotor for obtaining the first reduction. Initially, the material to be reduced in size is introduced into the swept area of the rotor. When the material contacts the rotor, a portion of the accumulated kinetic energy generated by the rotor is transferred to the material, forcing it to accelerate as well as change direction. The material will tend to resist this, so the energy transferred accumulates within the material. This in turn will cause any friable material to shatter along its natural fault lines and the resulting smaller particles will be accelerated away from the rotor.
- an apparatus for fragmenting solid materials into particles comprising: a housing; a first impact chamber defined within the housing and having a feed opening; a feed system positioned above the feed opening of the first impact chamber for feed of solid materials into the impact chamber; a rotor having impact hammers at its periphery located within the first impact chamber for rotation about an axis of the rotor transverse to the feed opening, the rotor being positioned relative to the feed opening such that said impact hammers impact and deflect the solid materials entering through the feed opening, thereby fragmenting the solid materials to form particles; a plurality of shatter bars located within the first impact chamber arranged such that the shatter bars contact the deflected solid materials, thereby further fragmenting the solid material into said particles; a second impact chamber defined within the housing downstream of the rotor; means for connecting the first impact chamber and the second impact chamber such that the particles pass from the first chamber to the second chamber under momentum from the rotor; the rotor being arranged such that rotation
- a rotor with greater exposed blade or hammer surface will move more air, although, as a consequence, this type of rotor is not very durable.
- generation of airflow by the rotor is not a concern in the above-described apparatus because of the supplemental airflow generated by the exhaust fan.
- the rotor is designed to impart as much accumulated kinetic energy to the incoming material as possible by having the largest mass possible within the swept area of the rotor.
- the conveyor is positioned so that material is introduced into the rotor circle in a manner that imparts the maximum amount of the kinetic energy from the revolving rotor to the material with the least amount of strain on the rotor bearings.
- the rotor serves only to bump or tip the incoming material and to direct the fractured particles into the shatter bars.
- the position of the shatter bars is such that, following impact, the particles are directed back toward the rotor swept area and, in a continuous feed situation, these returning particles are met by new particles that have been produced by the rotor striking newly introduced material, thereby causing further attrition.
- the particles are then swept around the fixed portion of the apparatus connecting the two impact chambers, following a specifically designed curve into the second impact chamber where they are thrown against the reduction means.
- the reduction means provide the final particle size control as they form a restrictive path to the fine particle outlet.
- the reduction means may take the form of staggered bars, perforated metal plates, wire screens or all of these combined.
- the exhaust fan acts as a scavenger by creating a path of steadily moving air from the material intake to the fine particle outlet so that all material follows the desired path through the apparatus.
- the supplementary airflow also reduces wear, as it prevents entrained particles from contacting the apparatus.
- the reduction means are staggered or offset so as to force the airflow to rapidly change direction so that any particles with too much mass to remain entrained are reflected back into the flow of material until they have been sufficiently reduced in size to remain in the airflow.
- Figure 1 is a side view in cross-section of the rotary mill.
- a rotary mill 1 comprises a housing 10, a material delivery system 12 and an exhaust fan 14.
- the housing 10 comprises a rotor 16, a primary reduction chamber 18, a secondary reduction chamber 20 and an outlet chamber 22, as shown in Figure 1.
- the secondary reduction chamber 20 is connected to the primary reduction chamber 18 by a curved portion 30 as described below.
- the secondary reduction chamber 18 includes reduction means 32 positioned between the secondary reduction chamber 20 and the outlet chamber 22, arranged such that particles above a given size are prevented from entering the outlet chamber 22.
- the reduction means 32 may comprise staggered bars, perforated metal plates, wire screens or combinations thereof.
- the outlet chamber 22 comprises a fan outlet 34, a fan control means 36 and a lower material outlet 38.
- the fan outlet 34 comprises the exit from the housing 10 for fine particles and for airflow generated by the exhaust fan 14 as described below.
- the lower material outlet 38 comprises a balanced door 40 situated at the base of the outlet chamber 22 for removal of heavy particles. Specifically, once a mass of material equal to the balance weight has gathered, the balanced door 40 opens and expels the material from the housing 10.
- the fan control means 36 comprises a movable baffle 42 located within the output chamber 22 for controlling airflow through the housing 10 so that the amount and size of particles drawn off at the fan outlet 34 and the lower material outlet 38 may be varied as described below.
- the rotor 16 is arranged for rotation within the housing 10 and is driven by a motor, the details of which are not shown as these will be obvious to one skilled in the art.
- the rotor 16 includes peripheral impact means 44 and is situated below the intake shaft 26. While a rotor that exposes more blade will move more air, durable construction and suitable mass for reducing incoming material conflict with ideal air moving capabilities. However, generation of airflow by the rotor 16 is not an important consideration due to the airflow generated by the exhaust fan 14. Thus, the rotor 16 is arranged so that the impact means 44 have the largest mass possible within the swept area of the rotor 16. In this embodiment, the rotor 16 includes three impact means 44, although it is of note that the construction of the rotor 16 may vary greatly.
- the exhaust fan 14 is arranged to produce an airflow through the housing. Specifically, the exhaust fan 14 is connected to the fan outlet such that the airflow generated by the exhaust fan 14 is drawn into the housing 10 via the inlet opening 24 and is drawn out of the housing 10 via the fan outlet 34.
- the details of the exhaust fan 14 are not shown as these will be obvious to one skilled in the art.
- the material delivery system 12 transports material to the rotary mill 1.
- the material delivery system 12 comprises a conveyor 46.
- the rotary mill 1 cannot be "choke” loaded.
- computerized control of the conveyor 46 may be used to provide a steady input volume regardless of input material size.
- rotor speed and airflow may be monitored to determine loading efficiency and this information may be used to control the power source driving the conveyor 46.
- the mass of material within the rotary mill 1 may be closely controlled so that attrition of material occurs at a steady rate.
- the material to be reduced is transported by the conveyor 46 to the inlet opening 24.
- the material passes therethrough onto the intake shaft 26 at a speed at or near free fall.
- the intake shaft 26 directs the material into the swept area of the impact means 44 of the rotor 16.
- the intake shaft 26 is positioned such that a maximum amount of the kinetic energy generated by the rotor 16 is transferred to the material with minimal strain on the rotor 16, so that the rotor 16 needs only to tip or bump the incoming material.
- This transfer of kinetic energy shatters the material along natural fault planes, producing smaller particles.
- the smaller particles are accelerated away from the rotor 16 and into the shatter bars 28 where further reductions occur as a result of collisions between the shatter bars 28 and the smaller particles.
- the shatter bars 28 do not have to be of massive structure or unusual hardness because of the reduced size of the particles.
- the shatter bars 28 also direct the smaller particles back towards the swept area of the rotor 16 where, in a continuous feed situation, the smaller particles encounter new particles produced by the impact means 44 of the rotor 16 striking newly introduced material and these secondary impacts between reflected material and recently shattered material result in further reduced particles.
- the rotor 16 causes a localized increase in the pressure of the airflow generated by the exhaust fan 14. This forces entrained particles, which are naturally quite abrasive, away from the housing 10, thereby drastically reducing scrubbing and wear on the rotary mill 1.
- the reduced particles are swept by the airflow drawn through the housing by the exhaust fan 14 around the curved portion 30 into the secondary reduction chamber 20.
- the curved portion 30 is arranged such that the airflow generated by the exhaust fan 14 directs the reduced particles toward the reduction means 32 in the secondary reduction chamber 20.
- the reduction means 32 are arranged such that only particles below a given size, or fine particles, pass through the reduction means 32 and enter the outlet chamber 22 while oversized particles are directed back into the flow of reduced particles leaving the rotor path.
- the reduction means 32 provide the final particle size control, forming a restriction in the path that material follows through the housing 10.
- the close, staggered configuration of the reduction means 32 causes the airflow generated by the exhaust fan 14 to change direction rapidly several times before being drawn out of the secondary reduction chamber 20. This turbulent airflow prevents particle build-up from occurring on the reduction means 32.
- the position and orientation of the reduction means 32 is not critical as they may be placed either vertically or horizontally with little or no change in their effectiveness.
- the flow of fine particles may, for example, be blown into a bag house or cyclone or may be turned into a slurry by the addition of a water spray.
- the heavy material which exits the lower opening can be fed into any suitable classification machinery for further processing.
- this arrangement also serves as a simple means of material classification.
- time of material residency is an important factor in the successful operation of the above-described rotary mill 1.
- the tendency to return particles to the new product flow can cause a build-up of material in the system.
- This has been overcome by the addition of a supplementary airflow generated by the exhaust fan 14.
- the exhaust fan 14 creates a path of steadily moving air from the inlet opening 24 to the fan outlet 34.
- the airflow overcomes turbulence created by the rotor 16 and ensures that all material continues to follow the desired path through the rotary mill 1.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Pulverization Processes (AREA)
- Supercharger (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Crushing And Grinding (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU18533/00A AU777743B2 (en) | 2000-01-06 | 2000-01-06 | Rotary mill |
EP00900046A EP1255611B1 (en) | 2000-01-06 | 2000-01-06 | Rotary mill |
CA002396580A CA2396580C (en) | 2000-01-06 | 2000-01-06 | Rotary mill |
ES00900046T ES2295003T3 (en) | 2000-01-06 | 2000-01-06 | ROTARY MILL. |
DE60036964T DE60036964T2 (en) | 2000-01-06 | 2000-01-06 | ROTATING MILL |
AT00900046T ATE376883T1 (en) | 2000-01-06 | 2000-01-06 | ROTATING MILL |
PCT/CA2000/000002 WO2001049417A1 (en) | 2000-01-06 | 2000-01-06 | Rotary mill |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CA2000/000002 WO2001049417A1 (en) | 2000-01-06 | 2000-01-06 | Rotary mill |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001049417A1 true WO2001049417A1 (en) | 2001-07-12 |
Family
ID=4143030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2000/000002 WO2001049417A1 (en) | 2000-01-06 | 2000-01-06 | Rotary mill |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1255611B1 (en) |
AT (1) | ATE376883T1 (en) |
AU (1) | AU777743B2 (en) |
CA (1) | CA2396580C (en) |
DE (1) | DE60036964T2 (en) |
ES (1) | ES2295003T3 (en) |
WO (1) | WO2001049417A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1737931A (en) * | 1928-01-05 | 1929-12-03 | Frank G Lugrin | Coal pulverizer |
CH269259A (en) * | 1943-08-03 | 1950-06-30 | Tortorelli Fratelli | Hammer mill. |
BE726597A (en) * | 1968-02-27 | 1969-06-16 | ||
US3887141A (en) | 1973-09-17 | 1975-06-03 | Ind Mining Machinery Corp | Impact-attrition mill utilizing air flow |
AU512623B2 (en) * | 1973-05-30 | 1980-10-23 | Verdun Barker Arnold | Hammer mills |
US4361290A (en) * | 1980-06-23 | 1982-11-30 | Francis Peter M | Adjustable rotary crusher |
US4848677A (en) * | 1987-10-30 | 1989-07-18 | Illabo Mining Equipment Company | Comminution/recovery ore mill |
US4998676A (en) * | 1987-01-15 | 1991-03-12 | Graziano Sirol | Mill |
-
2000
- 2000-01-06 WO PCT/CA2000/000002 patent/WO2001049417A1/en active Search and Examination
- 2000-01-06 AT AT00900046T patent/ATE376883T1/en not_active IP Right Cessation
- 2000-01-06 DE DE60036964T patent/DE60036964T2/en not_active Expired - Lifetime
- 2000-01-06 ES ES00900046T patent/ES2295003T3/en not_active Expired - Lifetime
- 2000-01-06 CA CA002396580A patent/CA2396580C/en not_active Expired - Lifetime
- 2000-01-06 EP EP00900046A patent/EP1255611B1/en not_active Expired - Lifetime
- 2000-01-06 AU AU18533/00A patent/AU777743B2/en not_active Ceased
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1737931A (en) * | 1928-01-05 | 1929-12-03 | Frank G Lugrin | Coal pulverizer |
CH269259A (en) * | 1943-08-03 | 1950-06-30 | Tortorelli Fratelli | Hammer mill. |
BE726597A (en) * | 1968-02-27 | 1969-06-16 | ||
AU512623B2 (en) * | 1973-05-30 | 1980-10-23 | Verdun Barker Arnold | Hammer mills |
US3887141A (en) | 1973-09-17 | 1975-06-03 | Ind Mining Machinery Corp | Impact-attrition mill utilizing air flow |
US4361290A (en) * | 1980-06-23 | 1982-11-30 | Francis Peter M | Adjustable rotary crusher |
US4998676A (en) * | 1987-01-15 | 1991-03-12 | Graziano Sirol | Mill |
US4848677A (en) * | 1987-10-30 | 1989-07-18 | Illabo Mining Equipment Company | Comminution/recovery ore mill |
Also Published As
Publication number | Publication date |
---|---|
EP1255611B1 (en) | 2007-10-31 |
AU777743B2 (en) | 2004-10-28 |
DE60036964D1 (en) | 2007-12-13 |
EP1255611A1 (en) | 2002-11-13 |
AU1853300A (en) | 2001-07-16 |
ES2295003T3 (en) | 2008-04-16 |
CA2396580C (en) | 2008-01-22 |
CA2396580A1 (en) | 2001-07-12 |
DE60036964T2 (en) | 2008-05-21 |
ATE376883T1 (en) | 2007-11-15 |
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