US3186648A - Fluid energy mill - Google Patents
Fluid energy mill Download PDFInfo
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- US3186648A US3186648A US283459A US28345963A US3186648A US 3186648 A US3186648 A US 3186648A US 283459 A US283459 A US 283459A US 28345963 A US28345963 A US 28345963A US 3186648 A US3186648 A US 3186648A
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- energy mill
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- 239000012530 fluid Substances 0.000 title description 14
- 239000002245 particle Substances 0.000 description 17
- 230000003068 static effect Effects 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000000227 grinding Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010951 particle size reduction Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
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
- B02C19/06—Jet mills
- B02C19/065—Jet mills of the opposed-jet type
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S55/00—Gas separation
- Y10S55/34—Indicator and controllers
Definitions
- Claim. (Cl. 241-34) This invention relates to improvements in fluid energy mill operations. In one specific aspect, it relates to the elimination of static electricity in fluid energy mills.
- Particle size reduction of ores and other hard materials is an important industrial process.
- One of the many techniques that can be used to accomplish this reduction is attrition grinding as obtained by the use of the fluid energy mill.
- gas of a high energy content is introduced into a pulverizing chamber. Feed materials in the chamber are caused to impinge upon themselves at high velocities while entranied in the gas stream, causing a reduction in particle size.
- Twocommon types of fluid energy mills are the Micronizer and the jet pulverizer. Depending upon plant conditions and the material to be processed, these mills are operated by steam, gas or compressed air.
- This problem is particularly troublesome in the grinding of the mineral bastnasite to make glass polishing powder.
- FIG. 1 is a schematic diagram of a typical fluid energy mill modified in accordance with the present invention.
- FIG. 2 is a horizontal sectional view of the apparatus of FIG. 1 taken along line A-A of FIG. 1.
- the present invention contemplates the introduction of water into a fluid energy millto reduce the static charge on the ground particles.
- a typical fluid energy mill used in the practice of this invention is a jet pulverizer, although it should be understood that the detailed description and specific examples, which indicate preferred embodiments of the invention, are given by way of illustration only.
- Various changes and modifications within the spirit and scope of the invention opposing jets 13, through which high velocity heated air "ice is fed.
- the material 14 between the jets 13 is maintained in a high state of turbulence and is pulverized.
- the pulverized particles are swept from the grinding zone 12 by an auxiliary current of room air through a conduit 15 into a classifier 17, the line particles remain suspended in the air and are swept from the classifier 17 (such as a cyclone) through conduit 18 into a filter 1 9 (suchas a collector).
- the coarser particles from classifier 17 are passed through conduits 20 to hopper 21 where they are picked up by Venturi tubes 23 and returned to the grinding zone 12 through jets 13 for further processing.
- the high energy gas for grinding the particles enters the mill through conduit 24 preheated by heat exchanger 25.
- the preferred gas for this invention is. compressed air at elevated temperatures. 7
- Water as an atomized spray or as steam may be introduced into the grinding zone 12, through a separate nozzle 26 or by injection into the compressed air stream 24. If desired, it may bev introduced at both points simultaneously.
- the atomized spray 27 be directed into the mass of commuting particles 14.
- a spray nozzle 25 is preferably utilized to inject the water or steam in the grinding zone 12 to avoid excessive localized wetting, which may cause agglomeration of particles.
- the amount of water necessary to eliminate the static charge is obviously dependent upon the moisture content of the material to be ground and on the moisture content of the compressed air.
- the moisture in the air will vary with the outside atmospheric conditions. For example, on dry days the moisture content will be less than that of rainy days. It is desirable that the temperature of the efliuent air 29 be maintained at about 50 F. above the dew point temperature to facilitate the collection of the fine particles in filter 19.
- the amount of water or steam injected into the grinding zone 12 can be controlled by inserting a probe 30 into conduit 18 between the classifier 17 and the bag collector 19, and connecting the probe 30 to an electro-static or vacuum tube voltmeter 31 such as a Farranti or R.C.A. vacuum tube voltmeter for static high voltage determination.
- the voltmeter in turn is connected to a recorder-controller 32 such as a Minneapolis Honeywell Electronic #15 Round Chart Recording-Controller; this device controls valve 33 monitoring the water or steam flow.
- the valve 33 may be a Minneapolis Honeywell 904E valve positioner, balancing relay t ype.
- valve 33 In operation a signal from probe 30, transmitted through the voltmeter 31, to the recorder-controller 32 actuates valve 33 to emit more or less water or steam to the grinding zone 12 as needed.
- the recorder-controller 32 may 1 be by-passed for manual operation of valve 33, if desired.
- This invention is applicable to the size reduction of a wide variety of materials capable of generating a static charge in a fluid energy mill.
- materials capable of generating a static charge in a fluid energy mill.
- these materials are aluminum oxide, ceramic frit, powdered insecticides such as DDT, diatomaceous earth, feldspar, fluorspar, graphite, gypsum, iron ore, iron oxide, iron powder, linestone, mica, paint pigments, polymers, rare earth ores carbon, talc, and the like.
- Test 3 This test was a repeat of Test 2, with the water injection rate raised to 15 gallons per hour. The charge on the ground particles as measured on the volt meter was 200 volts. The bastnasite flowed freely through the mill,c0uld be removed readilyfrom the bagcollector and the grinding capacity of the mill was increased.
Description
June 1, 1965 R. M. MANDLE ETAL 3,186,648
FLUID ENERGY MILL Filed May 27, 1963 yls' Zfl
20 20 H V I5 '1" |2 |,|4 v 2| P A A j I 2' A L HIXIRK l I r 25 F|G.l
INVENTORS RICHARD M. MANDLE THOMAS O. TONGUE ATTORNEY United States Patent 3,186,648 FLUID ENERGY MILL Richard M. Maudie, Pompton Lakes, N.J., and Thomas 0. Tongue, Baltimore, Md., assignors to W. R. Grace & Co., New York, N.Y., a corporation OfCOEHlQCilCUt Filed May 27, 1963, Ser. No. 283,459
1 Claim. (Cl. 241-34) This invention relates to improvements in fluid energy mill operations. In one specific aspect, it relates to the elimination of static electricity in fluid energy mills.
Particle size reduction of ores and other hard materials is an important industrial process. One of the many techniques that can be used to accomplish this reduction is attrition grinding as obtained by the use of the fluid energy mill.
In the operation of a fluid energy mill, gas of a high energy content is introduced into a pulverizing chamber. Feed materials in the chamber are caused to impinge upon themselves at high velocities while entranied in the gas stream, causing a reduction in particle size. Twocommon types of fluid energy mills are the Micronizer and the jet pulverizer. Depending upon plant conditions and the material to be processed, these mills are operated by steam, gas or compressed air.
One of the problems encountered with the use of compressed air is the generation of static electricity. The
problem is especially aggravated when the air is heated.
to elevated temperatures, causing a hot, dry atmosphere in the mill. In this atmosphere, the impingement of the particles upon themselves generates a static charge. This charge presents two problems, (a) the flow of ground and semi-ground particles is impeded, thus reducing the capacity and general performance of the mill, and (b) material recovered in the collection bags is diflicult or impossible to remove by the normal blow back procedures. This causes a back pressure to develop which in turn upsets overall balance and the mill has to be stopped.
This problem is particularly troublesome in the grinding of the mineral bastnasite to make glass polishing powder.
Heretofore, there has been, no known method for preventing the formation of static electricity in the fluid energy mills.
It is, therefore, an object of this invention to provide a method for preventing the accumulation of static electricity in a fluid energy mill. 7
It is also an object to provide a method of grinding dry solids.
These and other objects of the present invention will become readily apparent from the following detailed description, specific examples, and drawing wherein;
FIG. 1 is a schematic diagram of a typical fluid energy mill modified in accordance with the present invention; and
FIG. 2 is a horizontal sectional view of the apparatus of FIG. 1 taken along line A-A of FIG. 1.
Broadly, the present invention contemplates the introduction of water into a fluid energy millto reduce the static charge on the ground particles.
A typical fluid energy mill used in the practice of this invention is a jet pulverizer, although it should be understood that the detailed description and specific examples, which indicate preferred embodiments of the invention, are given by way of illustration only. Various changes and modifications within the spirit and scope of the invention opposing jets 13, through which high velocity heated air "ice is fed. The material 14 between the jets 13 is maintained in a high state of turbulence and is pulverized. The pulverized particles are swept from the grinding zone 12 by an auxiliary current of room air through a conduit 15 into a classifier 17, the line particles remain suspended in the air and are swept from the classifier 17 (such as a cyclone) through conduit 18 into a filter 1 9 (suchas a collector). The coarser particles from classifier 17 are passed through conduits 20 to hopper 21 where they are picked up by Venturi tubes 23 and returned to the grinding zone 12 through jets 13 for further processing. The high energy gas for grinding the particles enters the mill through conduit 24 preheated by heat exchanger 25. The preferred gas for this invention is. compressed air at elevated temperatures. 7
Water as an atomized spray or as steam may be introduced into the grinding zone 12, through a separate nozzle 26 or by injection into the compressed air stream 24. If desired, it may bev introduced at both points simultaneously. In the injection of water or steam into the pulverizing chamber 12, it is advantageous that the atomized spray 27 be directed into the mass of commuting particles 14. A spray nozzle 25 is preferably utilized to inject the water or steam in the grinding zone 12 to avoid excessive localized wetting, which may cause agglomeration of particles.
'The amount of water necessary to eliminate the static charge is obviously dependent upon the moisture content of the material to be ground and on the moisture content of the compressed air. The moisture in the air will vary with the outside atmospheric conditions. For example, on dry days the moisture content will be less than that of rainy days. It is desirable that the temperature of the efliuent air 29 be maintained at about 50 F. above the dew point temperature to facilitate the collection of the fine particles in filter 19.
Various methods are available for determining optimum conditions for continuous mill operations. Among them are the determination of the relative humidity of the efliuent air 29, continuous moisture analysis of the efiiuent air 29, and a determination of the electro-static charge on the particles.
We have found that the amount of water or steam injected into the grinding zone 12 can be controlled by inserting a probe 30 into conduit 18 between the classifier 17 and the bag collector 19, and connecting the probe 30 to an electro-static or vacuum tube voltmeter 31 such as a Farranti or R.C.A. vacuum tube voltmeter for static high voltage determination. The voltmeter in turn is connected to a recorder-controller 32 such as a Minneapolis Honeywell Electronic #15 Round Chart Recording-Controller; this device controls valve 33 monitoring the water or steam flow. The valve 33 may be a Minneapolis Honeywell 904E valve positioner, balancing relay t ype. In operation a signal from probe 30, transmitted through the voltmeter 31, to the recorder-controller 32 actuates valve 33 to emit more or less water or steam to the grinding zone 12 as needed. The recorder-controller 32 may 1 be by-passed for manual operation of valve 33, if desired.
This invention is applicable to the size reduction of a wide variety of materials capable of generating a static charge in a fluid energy mill. Examples of these materials are aluminum oxide, ceramic frit, powdered insecticides such as DDT, diatomaceous earth, feldspar, fluorspar, graphite, gypsum, iron ore, iron oxide, iron powder, linestone, mica, paint pigments, polymers, rare earth ores carbon, talc, and the like.
The reduction of static electricity in a jetpulverizer isshown in the following examples.
'the opposing air jets.,
. 3 EXAMPLE 1 The mill used in this example was a Majac jet pulverizer of the type described elsewhere in the specification. This mill was equipped with an oilburner nozzle 26 that sprayed a fan shaped mist 27 of water directly between Test 1.Bastnasite ore was fed ata rate of 300 pounds per hour into the jet pulverizer under. the following conditions: grind aha-800 cubic feet per'minute at 100' pounds per square inch at 750 F. "Sweep air-4000 cubic feetper minute at 1 to 2 pounds per square inch at ambient temperature. Was inserted in the line between the classifier 17 and the bag collector 19 and connected to a vacuum tube voltmeter 31 to measure the extentof electrostatic charge in theground particles. The charge registered was in excess of 1000 volts, and within 2 hours of this reading the mill An electrostaticsensing probe 30 7 was shut down due to the excessive pressure drop across the bag collector. g V a Test 2.-Bastnasite ore was ground under the same conditions asin' Test 1, except that the control valve 32 was operated manually and water was injectedthrough nozzle 26'into the pulverizing chamber 12 ata rate of 9 gallons per hour. The static charge of the groundparticle s was reduced to 500. volts and, the freely through the mill.
bastnasite ore flowed,
Test 3.This test was a repeat of Test 2, with the water injection rate raised to 15 gallons per hour. The charge on the ground particles as measured on the volt meter was 200 volts. The bastnasite flowed freely through the mill,c0uld be removed readilyfrom the bagcollector and the grinding capacity of the mill was increased.
by 25 percent.
dry heated gasstream and separation of comminuted particles from said gasstream is impeded by the buildup of static electric charges on said particles, means for injecting water into the particle stream passing through said mill .to dissipate the static charge on said particles, means for monitoring static electric charge on the particlesiof said stream, water controlling means w for" controlling the amount of Water injected 'by said injection means, said controlling means responsive 'to' said monitoringmeans whereby the amount of water injected into said particle stream is proportional to the amountrequired to substantially dissipatethe static electric charge thereon as, determined by said monitoring means. 7
V Reierences Cited by the Examiner y NITED STATES PATENTS 7 238,044 2/81 Luckenbach et al. 241-5 1,058,31-3 14/ 13 Luckenbach V 2415 2,412,586 12/46 Knowland.j r 241-7-15X 2,833,482. 5/58 Weston et a1 241-15 X 2,885,154 v5/59 Eastman et al 241.-5 2,914,391 11/59 Stratford. 241-5X 3,168,253 2/ 5, ,Masuda 241- 16 YFOREIGNIPATVENTS 986,566 3/51 Fra'nce.
J J. SPENCER -OVERHOLSER,*Primg1-y Examiner.
WILLIAMW.DYER,1JR., Examiner.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US283459A US3186648A (en) | 1963-05-27 | 1963-05-27 | Fluid energy mill |
Applications Claiming Priority (1)
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US283459A US3186648A (en) | 1963-05-27 | 1963-05-27 | Fluid energy mill |
Publications (1)
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US3186648A true US3186648A (en) | 1965-06-01 |
Family
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US283459A Expired - Lifetime US3186648A (en) | 1963-05-27 | 1963-05-27 | Fluid energy mill |
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Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3282514A (en) * | 1963-03-12 | 1966-11-01 | Metallgesellschaft Ag | Method for controlling the amount of liquid added to heat absorbing gases |
US3815833A (en) * | 1973-01-08 | 1974-06-11 | Fluid Energy Process Equip | Method and apparatus for grinding thermoplastic material |
WO1983001915A1 (en) * | 1981-11-27 | 1983-06-09 | Jouko Niemi | Pressure-chamber grinder |
US4441657A (en) * | 1981-10-16 | 1984-04-10 | Standard Oil Company (Indiana) | Decreasing static charge of a particulate solid product which causes product to plug metal line used for pneumatic fluidized solid conveyance |
US4538764A (en) * | 1983-06-30 | 1985-09-03 | Dunbar Richard M | Method and apparatus for providing finely divided powder |
EP0179943A1 (en) * | 1983-09-19 | 1986-05-07 | Freund Industrial Co., Ltd. | Coating method and apparatus |
US4592302A (en) * | 1984-11-07 | 1986-06-03 | Freund Industrial Co., Ltd. | Coating method and apparatus |
US4602743A (en) * | 1983-10-20 | 1986-07-29 | Alpine Aktiengesellschaft | Fluidized bed jet mill |
EP0211117A2 (en) * | 1985-08-02 | 1987-02-25 | Rmd Industries, Inc. | Method and apparatus for providing finely divided powder |
US4880170A (en) * | 1989-01-03 | 1989-11-14 | Gte Products Corporation | Process for producing fine copper powder with enhanced sinterability |
US4884754A (en) * | 1989-01-03 | 1989-12-05 | Gte Products Corporation | Process for producing fine copper flakes |
US4962893A (en) * | 1988-10-05 | 1990-10-16 | Messer. Griesheim | Process and device for cold milling |
US5385640A (en) * | 1993-07-09 | 1995-01-31 | Microcell, Inc. | Process for making microdenominated cellulose |
US5487419A (en) * | 1993-07-09 | 1996-01-30 | Microcell, Inc. | Redispersible microdenominated cellulose |
US20010036438A1 (en) * | 2000-04-27 | 2001-11-01 | Koji Yamamoto | Method for producing an inorganic oxide powder |
JP2006509627A (en) * | 2002-12-13 | 2006-03-23 | シンジェンタ パーティシペーションズ アクチェンゲゼルシャフト | Method and apparatus for coating finely divided solids |
WO2019116365A1 (en) | 2017-12-12 | 2019-06-20 | Super Fine Ltd. | Vortex mill and method of vortex milling for obtaining powder with customizable particle size distribution |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US238044A (en) * | 1881-02-22 | luckenbach | ||
US1058313A (en) * | 1912-05-21 | 1913-04-08 | Luckenbach Inv S Dev Company | Pulverizer. |
US2412586A (en) * | 1943-08-20 | 1946-12-17 | Boston Woven Hose & Rubber Com | Grinding of rubber scrap |
FR986566A (en) * | 1949-03-12 | 1951-08-02 | Houilleres Bassin Du Nord | Process for causing flocculation of suspended dust in a gaseous atmosphere |
US2833482A (en) * | 1957-03-26 | 1958-05-06 | Weston David | Automatic control for wet grinding mills |
US2885154A (en) * | 1954-08-17 | 1959-05-05 | Texas Co | Method of and apparatus for grinding solid materials by fluid energy |
US2914391A (en) * | 1955-03-04 | 1959-11-24 | Texaco Inc | Treating solid materials |
US3168253A (en) * | 1961-10-18 | 1965-02-02 | Onoda Cement Co Ltd | Method of grinding quicklime |
-
1963
- 1963-05-27 US US283459A patent/US3186648A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US238044A (en) * | 1881-02-22 | luckenbach | ||
US1058313A (en) * | 1912-05-21 | 1913-04-08 | Luckenbach Inv S Dev Company | Pulverizer. |
US2412586A (en) * | 1943-08-20 | 1946-12-17 | Boston Woven Hose & Rubber Com | Grinding of rubber scrap |
FR986566A (en) * | 1949-03-12 | 1951-08-02 | Houilleres Bassin Du Nord | Process for causing flocculation of suspended dust in a gaseous atmosphere |
US2885154A (en) * | 1954-08-17 | 1959-05-05 | Texas Co | Method of and apparatus for grinding solid materials by fluid energy |
US2914391A (en) * | 1955-03-04 | 1959-11-24 | Texaco Inc | Treating solid materials |
US2833482A (en) * | 1957-03-26 | 1958-05-06 | Weston David | Automatic control for wet grinding mills |
US3168253A (en) * | 1961-10-18 | 1965-02-02 | Onoda Cement Co Ltd | Method of grinding quicklime |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3282514A (en) * | 1963-03-12 | 1966-11-01 | Metallgesellschaft Ag | Method for controlling the amount of liquid added to heat absorbing gases |
US3815833A (en) * | 1973-01-08 | 1974-06-11 | Fluid Energy Process Equip | Method and apparatus for grinding thermoplastic material |
US4441657A (en) * | 1981-10-16 | 1984-04-10 | Standard Oil Company (Indiana) | Decreasing static charge of a particulate solid product which causes product to plug metal line used for pneumatic fluidized solid conveyance |
WO1983001915A1 (en) * | 1981-11-27 | 1983-06-09 | Jouko Niemi | Pressure-chamber grinder |
US4546926A (en) * | 1981-11-27 | 1985-10-15 | Jouko Niemi | Pressure-chamber grinder |
US4538764A (en) * | 1983-06-30 | 1985-09-03 | Dunbar Richard M | Method and apparatus for providing finely divided powder |
EP0179943A1 (en) * | 1983-09-19 | 1986-05-07 | Freund Industrial Co., Ltd. | Coating method and apparatus |
US4602743A (en) * | 1983-10-20 | 1986-07-29 | Alpine Aktiengesellschaft | Fluidized bed jet mill |
US4592302A (en) * | 1984-11-07 | 1986-06-03 | Freund Industrial Co., Ltd. | Coating method and apparatus |
EP0211117A3 (en) * | 1985-08-02 | 1988-02-03 | Rmd Industries, Inc. | Method and apparatus for providing finely divided powder |
EP0211117A2 (en) * | 1985-08-02 | 1987-02-25 | Rmd Industries, Inc. | Method and apparatus for providing finely divided powder |
US4962893A (en) * | 1988-10-05 | 1990-10-16 | Messer. Griesheim | Process and device for cold milling |
US4880170A (en) * | 1989-01-03 | 1989-11-14 | Gte Products Corporation | Process for producing fine copper powder with enhanced sinterability |
US4884754A (en) * | 1989-01-03 | 1989-12-05 | Gte Products Corporation | Process for producing fine copper flakes |
US5385640A (en) * | 1993-07-09 | 1995-01-31 | Microcell, Inc. | Process for making microdenominated cellulose |
US5487419A (en) * | 1993-07-09 | 1996-01-30 | Microcell, Inc. | Redispersible microdenominated cellulose |
US20010036438A1 (en) * | 2000-04-27 | 2001-11-01 | Koji Yamamoto | Method for producing an inorganic oxide powder |
US6936236B2 (en) * | 2000-04-27 | 2005-08-30 | Sumitomo Chemical Company, Limited | Method for producing an inorganic oxide powder |
JP2006509627A (en) * | 2002-12-13 | 2006-03-23 | シンジェンタ パーティシペーションズ アクチェンゲゼルシャフト | Method and apparatus for coating finely divided solids |
WO2019116365A1 (en) | 2017-12-12 | 2019-06-20 | Super Fine Ltd. | Vortex mill and method of vortex milling for obtaining powder with customizable particle size distribution |
EP3703863A4 (en) * | 2017-12-12 | 2021-07-14 | Super Fine Ltd. | Vortex mill and method of vortex milling for obtaining powder with customizable particle size distribution |
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