US3822015A - Separation of solids by varying the bulk density of a fluid separating medium - Google Patents

Separation of solids by varying the bulk density of a fluid separating medium Download PDF

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Publication number
US3822015A
US3822015A US00008467A US846770A US3822015A US 3822015 A US3822015 A US 3822015A US 00008467 A US00008467 A US 00008467A US 846770 A US846770 A US 846770A US 3822015 A US3822015 A US 3822015A
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United States
Prior art keywords
density
liquid
objects
preselected
exceeding
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Expired - Lifetime
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US00008467A
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English (en)
Inventor
H Kornberg
J Hsieh
J Cline
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Battelle Development Corp
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Battelle Development Corp
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Priority to US00008467A priority Critical patent/US3822015A/en
Priority to CA097618A priority patent/CA930333A/en
Priority to DE19702056130 priority patent/DE2056130A1/de
Priority to CH1746170A priority patent/CH521794A/de
Priority to GB5805570A priority patent/GB1334248A/en
Priority to JP45130742A priority patent/JPS505815B1/ja
Priority to FR7101995A priority patent/FR2079225B1/fr
Priority to SE7101110A priority patent/SE375247B/xx
Application granted granted Critical
Publication of US3822015A publication Critical patent/US3822015A/en
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    • 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
    • B03B13/00—Control arrangements specially adapted for wet-separating apparatus or for dressing plant, using physical effects
    • B03B13/005—Methods or arrangements for controlling the physical properties of heavy media, e.g. density, concentration or viscosity
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36—Devices therefor, other than using centrifugal force
    • B03B5/40—Devices therefor, other than using centrifugal force of trough type
    • 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
    • B03B5/623—Upward current classifiers
    • 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
    • B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
    • B03B5/30—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation using heavy liquids or suspensions
    • B03B5/36—Devices therefor, other than using centrifugal force
    • B03B5/40—Devices therefor, other than using centrifugal force of trough type
    • B03B2005/405—Devices therefor, other than using centrifugal force of trough type using horizontal currents

Definitions

  • Cl B03b 1/00 fluid is altered to a value which will cause Separation [58] Field of Search...2l0/83, 84, 221,361,315-319; of the solid articles due to differences in buoyancy. 209/2, 172, 172.5, 173, 10
  • the density of the fluid separating medium is preferably altered by injection of small gas bubbles or other [56] R f re e Cit d fluid substances having a density differing from the first placed in the vessel.
  • This invention relatesto a method and apparatus for separating a mixture of objects according to the density of the individual objects.
  • This invention further relates to means for separating solids of varying densities by use of a fluid separating medium. More particularly, the present invention is concerned with a novel separating technique and apparatus in which solidarticles having slightly differing densities may be separated by use of a fluid separating medium in which the density is altered during the separating process in order to cause the solids of a higher density to be separated from the solids of a lower density due to positive buoyancy of the lower density solids and negativebuoyancy of the higher density solids.
  • Froth flotation is a widely used technique in the chemical process and mineral industries to separate the more valuable materialsfrom the tailings or gangue.
  • the froth flotation process finely ground materials are contacted with chemicals called promoters or collectors which render one portion of the particles air avid and water repellent. With vigorous agitation and aeration in the presence of a frother a layer of froth or foam forms at the top of the flotation machine. The portion of the particles which have become coated with the promoter or collector become attached to the air bubbles and rise to the surface where they may be collected by skimming techniques. The other portion of the material being treated is not attached to the bubbles and migrates to the bottom of the flotation apparatus. Depending upon the materials involved, the desired fraction either collects as a part of the froth at the top of the machine or as the unclerflow.
  • Froth flotation techniques depend upon the surface characteristics of the materials being separated and the surface effects, including liquid repellency and interaction between the particles and air bubbles. These surface effects are altered by the use of frothers including pine oil, alcohols, and other surface characteristic modifiers and other activators, alkalinity regulators, depressants, dispersants and deflocculants. Density differences play a very minor role in froth flotation and, in fact, may inhibit separation in flotation processes. A material may be favorably affected by the surface characteristic modifiers, but fail to rise to the surface with the froth due to the high density of the material. F roth flotation is useful only in processes in which the materials are ground to a fine mesh size, such as less than about mesh. For larger size particles, density effects overcome the froth flotation action and no separation results.
  • This invention has as one object the provision of a process and apparatus for separating relatively large mesh sized particles according to their density by use of a fluid separating medium.
  • a further object of this invention is to provide a process and apparatus in which macroscopic sized solids are separated according to their densities by use of a fluid separating medium in which the effective density of the fluid separation medium is varied causing the higher density objects to have a negative buoyancy and the lower density objects to have a positive buoyancy.
  • Another object of this invention is to provide a method of and apparatus'for causing separation of solids according to their densities using a variable density fluid separating medium.
  • a related object is to provide apparatus which causes a variation in the apparent density of the fluid separating medium so as to cause the lighter density fraction of the solid particles to float on the fluid separating medium and the heavier density particles to sink.
  • a still further object of this invention is to provide a convenient means to alter the effective density of a fluid.
  • a further related object is to provide means to alter the effective density of fluids used in solids handling apparatus to effect a separation of the solids being treated in the apparatus simultaneously with the solids handling and transporting operation.
  • a fluid column with means to alter the effective density of the fluid.
  • the materials to be separated are placed in the fluid column and seek a position dictated by the buoyancy provided by the fluid.
  • the effective density of the fluid separating medium is then changed to a value above that of the lower density fraction but below that of the higher density fraction of the materials being separated.
  • the higher density fraction of the material being separated then sinks to the bottom of the fluid separating medium due to a negative buoyancy, and the lighter materials re main afloat.
  • the fluid separating medium may have its effective density varied by one of a number of means including temperature variations, addition of chemicals soluble in the fluid, dilution with a lighter or heavier density fluid or injection of immiscible fluids into the fluid separating medium to alter the bulk density thereof.
  • FIG. 1 shows a schematic side view of one embodiment of this invention being used to separate fruit or vegetables having differing densities
  • FIG. 2 shows a schematic side view of another embodiment of this invention suitable for use as a garbage or refuse separator.
  • a water entry port 11 is shown at one side of tank 12. Air enters tank 12 through port 13 and is injected into the water through spargers 14. The objects being classified according to the density are shown entering the tank 12 from chute 16 and floating on the top of the water at 15. As the objects move across the surface of the water to the air-water mixture section 17, the heavier objects lose buoyancy and sink toward spargers 14. The lighter objects are removed from the surface of the air-water mixture section 17 by conveyor 20. The heavier objects move laterally under the current imposed by the bulk water flow in the apparatus until they are out of the airwater mixture zone 17. At that location positive buoyancy returns. The objects then resurface and are removed over weir 21. An inclined screen 25 is provided to reduce turbulence in the separation area 17 and to help move the objects having negative buoyancy in the separation area 17 toward weir 21.
  • FIG. 1 The embodiment shown in FIG. 1 has been successfully used in separating frost-damaged fruit such as apples from the non-damaged counterpart due to the fact that frost-damaged fruits. have a different density.
  • Other types of fruit, vegetables and similar objects of macroscopic size have been separated by use of this technique and apparatus.
  • the density of many fruits and vegetables is a function of the relative ripeness of the individualproducts.
  • Relatively greener produce has a markedly lower density than its riper counterpart.
  • damaged fruit such as tomatoes and potatoes frequently have internal cavities which drastically reduce the density of the fruit.
  • Use of the apparatus of this invention to sort fruit thus results in the unripe and damaged fruit being removed by conveyer 20 and the ripe product being removed over weir 21.
  • each product stream may be subjected to a second separation step to further classify the products as to density.
  • a second separation step to further classify the products as to density.
  • several air-liquid mixture zones can be provided in a single tank with a variety of air-liquid ratios presented to the objects being classified. Any number of product streams can thus be obtained by using multiple airliquid mixture zones.
  • the produce being separated is contacted with the water or other liquid separating media. This contact will act to remove dirt or other loosely bound impurities from the produce.
  • the produce may be conveniently treated by chemical additives or biochemically active substances added to the water. For example, the sprouting of potatoes may be inhibited by a chemical added to the water used in the separation process.
  • FIG. 2 a second embodiment of this invention is presented.
  • This embodiment of the invention permits the separation of various types of refuse materials on the basis of their density.
  • FIG. 2 is shown a single cell operation in tank 32 using a liquid such as water with air sparged into the lower portion of tank 32 through sparger 34 to produce an air-water mixture.
  • the separating apparatus in this embodiment is made up of a tank 32 having a heavy material settling section 42 separated from the main part of the tank by baffle 38.
  • a heavy material elevator 43 is provided to remove the heavy materials from the separator system. When water is used as a separating liquid, these materials would have a specific gravity exceeding 1.0.
  • the refuse material itself is introduced into the separation apparatus through feeder 44.
  • Water inlet 39 provides a flow of water through the apparatus to move floating material from its point of introduction into the separation apparatus toward the air-water mixture zone 46.
  • the material that floats on water is shown at 47 being transported across to the air-water mixture zone 46.
  • zone 46 the effective density of the water is decreased by sparging of air into the water to a point at which a portion of the materials no longer has a positive buoyancy and is caused to sink into the air-water mixture 46.
  • Air is introduced into the system through spargers 34 and caused to intimately mix with the water and rise through the water, thereby decreasing the effective density of the water. Materials which have a specific gravity less than the specific gravity of the bulk airwater mixture remain afloat and maybe removed by light material conveyor 50.
  • the materials which have a specific gravity exceeding that of the bulk air-water mixture shown at 49 sink to a certain extent in the airwater mixture and are transported laterally in the separation apparatus by the bulk flow of water. When they reach the quiescent area of the separation chamber, shown at 51, they regain positive buoyancy and rise. to the surface of the water. From this point they may be removed by the flow of water over weir 53 onto separator screen 54. The water is drained and returned to the tank 32 through inlet 39.
  • the garbage or garbage separation embodiment ofthis invention proceeds as follows: the garbage or other refuse material is crushed or divided into a mesh size not exceeding approximately 1 inch for convenience of handling. However, larger materials can be introduced as desired. It is important to crush or grind the garbage and refuse in order to make sure that materials such as cans and bottles no longer retain their fluid holding capacity and will sink or float with materials having similar specific gravities.
  • the refuse is dumped into the water from feeder 44.
  • the heavy materials such as metals, glass, ceramics, rocks and other materials having a specific gravity exceeding 1.0 will immediately sink in heavy material removal section 42 and may be removed on heavy material conveyer 43. This material may, of course be subjected to a second separation step in which a heavier liquid such as an aqueous solution of calcium carbonate or other salt is used.
  • the lighter materials 47 which float on water, are then transported laterally in the apparatus to the airwater mixture zone 46. At that point, materials which have a specific gravity of, for example, 0.7 to 1.0 are caused to lose buoyancy and sink due to the decreased effective density of the air-water mixture as compared to the adjacent water. Any material which remains at the surface, for example, that having a specific gravity less than 0.7, can then be removed by skimming or by removal on light material conveyer 50.
  • the materials 49 having mid-range density sink in the air-water mixture and are moved laterally by the gross movement of the water in the system. When they leave the air-water mixture zone 46, into the quiescent zone 51, they regain their positive buoyancy and return to the water surface. These materials may then be removed by skimming or by water flow across weir 53.
  • Each of the product streams of the garbage or refuse separator may be further subjected to buoyancy separation such that a different fraction of the materials is separated by use of a different liquid or by use of various air to liquid ratios in the air-liquid mixture zone.
  • Water is used as a convenient liquid because of its ready availability and low cost.
  • liquids such as kerosene or other petroleum-based liquids or aqueous salt solutions may be used to perform the separation.
  • EXAMPLE I One problem in the apple industry is to detect and separate water-core apples from normal apples. Watercore apples rot within a short time after harvest and cause damage to the other apples when the apples are stored in bulk-type storage. Water-core apples are difficult, if not impossible to detect by inspection of the exterior of the apples.
  • One usual characteristic of watercore apples is that they have a higher bulk density than the non water-core apples. Eleven apples, each having a perfect outward appearance, were floated upon water in a container and air was sparged into the bottom of the container by use of fritted glass spargers. Sufficient air was introduced into the bottom of the container to decrease the apparent density of the water to a value below that of one of the apples, as evidenced by its loss of buoyancy. The apples were then opened by cutting to check for water-core. The one apple which lost buoyancy was found to be a water-core apple and the remaining ten apples were sound.
  • EXAMPLE ll Twenty apples were treated as in Example I and two of the apples lost buoyancy at an effective density of the water equivalent to approximately 0.86. Upon cutting the apples it was found that one of the two apples which lost buoyancy was a water-core type apple. The other apple was sound and the other remaining 18 apples which retained buoyancy were found to be normal.
  • the apparatus shown in HO. 1 may also be used to separate materials such as bark from wood chips.
  • materials such as bark from wood chips.
  • One example of this use is discussed below.
  • the separation technique of this invention may be used on various fruits, vegetables and other foodstuffs to separate the materials according to ripeness and defects. Typical ex amples of items which may be susceptible to this type i of separation technique would include potatoes, on-
  • Citrus fruit growers will find the process and apparatus of this invention to be useful in separating the juicy, more valuable product suitable for fresh consumption from the pithy type of product which may be overripe and contain less of the desirable juicy characteristics.
  • Peas, beans and other vegetables which are harvested without respect to the individual degree of ripeness of the individual vegetables may be separated based on the moisture content which directly influences the specific gravity or density of the vegetable.
  • the process can, of course, be combined with a. washing of the vegetables or other articles being separated and possibly quick cooling of the vegetables to aid in preservation thereof.
  • sorting of eggs may be possible due to differences in densities of the eggs as they age.
  • Weed seeds can be easily separated from the more valuable grain and other type of seeds sought as prod ucts. Separations of types of grain seeds may also be possible if adequate differences exist in the respective densities of the types of grain.
  • the basic fluid separating medium for example, mercury could be used to separate lead particles from rocky material or other lighter density gangue type material if the leadis in, for example, shot form.
  • Heavyorganic liquid such as chloroform or salt solutions such as aqueous calcium carbonate or sodium chloride could be used to separate solid materials having densities exceeding 1.2. Many other suitable liquids will occur to one skilled in the art for particular applications.
  • fluids with a density lighter than that of water may be utilized.
  • fluids with a density lighter than that of water may be utilized.
  • petroleum distillates, such as kerosene may be used to separate articles having densi ties in the range of approximately 0.6 to 0.75.
  • Gaseous separating mediums could also be used for special applications. To use gases the density could be varied by variations in the pressure imposed on the container in which the separation process is taking place.
  • surface active agents which prevent the establishment of a permanent foam and aid in maintaining small gas bubble size may be used.
  • examples of such agents would include various low molecular weight alcohols and other additives well known in the art.
  • Systems in which two or more immiscible fluids are used may present the opportunity for complex, multiple splitseparations to take place within a single vessel by using various interfaces as the location at which articles of a particular density congregate.
  • a method for separating objects having a density exceeding a preselected density from objects having a density less than said preselected density comprising:
  • a method of separating articles into a plurality of groupings according to density comprising the steps of:
  • Apparatus for separating according to density a mixture of objects having a density exceeding a preselected density and objects having a density less than said preselected density comprising:
  • said means to adjust the effective density comprising gas sparging means positioned within said vessel;
  • said means to separately remove said objects having a density exceeding said preselected density and said objects having a density less than said preselected density from said vessel comprising a first removal means for collecting objects floating on said one portion of said liquid and means to move said objects having a density exceeding said preselected density to an adjacent portion of said liquid, being without gas sparged therein, wherein objects having a density exceeding said preselected density but less than the density of said liquid float to the liquid surface for removal from said liquid surface by a second removal means.

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  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Physical Water Treatments (AREA)
US00008467A 1970-02-04 1970-02-04 Separation of solids by varying the bulk density of a fluid separating medium Expired - Lifetime US3822015A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00008467A US3822015A (en) 1970-02-04 1970-02-04 Separation of solids by varying the bulk density of a fluid separating medium
CA097618A CA930333A (en) 1970-02-04 1970-11-06 Separation of solids by varying the bulk density of a fluid separating medium
DE19702056130 DE2056130A1 (de) 1970-02-04 1970-11-14 Verfahren und Vorrichtung zur Sortie rung von Korpern mit einem unterschiedh chen spezifischen Gewicht
CH1746170A CH521794A (de) 1970-02-04 1970-11-25 Verfahren und Vorrichtung zur Sortierung von Körpern mit unterschiedlichem spezifischem Gewicht
GB5805570A GB1334248A (en) 1970-02-04 1970-12-07 Method and apparatus for separating objects accordint to density
JP45130742A JPS505815B1 (de) 1970-02-04 1970-12-30
FR7101995A FR2079225B1 (de) 1970-02-04 1971-01-21
SE7101110A SE375247B (de) 1970-02-04 1971-01-29

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Application Number Priority Date Filing Date Title
US00008467A US3822015A (en) 1970-02-04 1970-02-04 Separation of solids by varying the bulk density of a fluid separating medium

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US3822015A true US3822015A (en) 1974-07-02

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US (1) US3822015A (de)
JP (1) JPS505815B1 (de)
CA (1) CA930333A (de)
CH (1) CH521794A (de)
DE (1) DE2056130A1 (de)
FR (1) FR2079225B1 (de)
GB (1) GB1334248A (de)
SE (1) SE375247B (de)

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US3971474A (en) * 1975-03-05 1976-07-27 Recor, Inc. Method and apparatus for sorting and classifying metallic cans
US3985650A (en) * 1974-03-25 1976-10-12 Mitsui Mining & Smelting Co., Ltd. Method for separating plastics-containing mixture
US4111798A (en) * 1976-11-30 1978-09-05 Battelle Development Corporation Separation of solids by varying the bulk density of a fluid separating medium
US4342654A (en) * 1980-06-25 1982-08-03 Fives-Cail Babcock Pulsation amplitude control for pneumatically pulsated liquid
US4352732A (en) * 1980-01-23 1982-10-05 Kelsey-Hayes Co. Flotation system
US4375264A (en) * 1981-05-19 1983-03-01 Doxsee Food Corp. Method and apparatus for segregating and separately recovering solids of different densities
US4376700A (en) * 1979-06-26 1983-03-15 Bethlehem Steel Corporation Method for beneficiating coal ore
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US6176376B1 (en) * 1997-03-18 2001-01-23 The Penn State Research Foundation Method and apparatus for separating a protein membrane and shell material in waste egg shells
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US20030145905A1 (en) * 2000-08-02 2003-08-07 Christer Eckerman Method for recovery of compression wood and/or normal wood from oversize chips
US6840715B2 (en) * 2000-05-09 2005-01-11 Antonio Crovara Pescia Chute for forced immersion of an article
US20090308550A1 (en) * 2008-06-16 2009-12-17 Weyerhaeuser Co. Pin chip recovery
US20120087547A1 (en) * 2010-10-12 2012-04-12 Ncr Corporation Produce recognition method
US20130224337A1 (en) * 2010-09-06 2013-08-29 Thoma Siegfried Method for flavouring syrup
US20140102950A1 (en) * 2012-10-12 2014-04-17 Cargill, Incorporated Method and apparatus for reducing aflatoxin-contaminated corn
US20150239683A1 (en) * 2014-02-24 2015-08-27 Ltw Intralogistics Gmbh Method for the partial emptying of buoyant objects and device for carrying out the method
CN105921255A (zh) * 2016-06-23 2016-09-07 云南翰林仁泽环保工程有限公司 垃圾水力分选一体机
US9840376B2 (en) * 2014-08-19 2017-12-12 Compac Technologies Limited Singulation apparatus and method
US10987699B2 (en) * 2016-11-08 2021-04-27 Jesús Sánchez Rodríguez Density separator for waste material
US11020751B2 (en) 2010-08-06 2021-06-01 Berry Plastics Corporation Separation process for plastics materials

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DE102009025843B4 (de) 2009-05-19 2022-11-17 Kronen Gmbh Vorrichtung und Verfahren zum Trennen von Pflanzenteilen
JP2011011143A (ja) * 2009-07-02 2011-01-20 Kyowa Sangyo Kk 廃棄材料の比重液分別機における廃棄材料供給装置およびこの廃棄材料供給装置を備える廃棄材料の比重液分別機
ES2526991T3 (es) 2010-11-12 2015-01-19 Kronen Gmbh Aparato para separar partes de plantas y metodo para separar partes de plantas
CN102327890A (zh) * 2011-09-19 2012-01-25 东莞市康达机电工程有限公司 餐厨垃圾分选系统
GB2574646A (en) * 2018-06-14 2019-12-18 Doppstadt Familienholding Gmbh Hydraulic density separator
CN112403662A (zh) * 2020-11-04 2021-02-26 王学金 一种数控机床的切屑分离搅散装置

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US20030145905A1 (en) * 2000-08-02 2003-08-07 Christer Eckerman Method for recovery of compression wood and/or normal wood from oversize chips
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US11020751B2 (en) 2010-08-06 2021-06-01 Berry Plastics Corporation Separation process for plastics materials
US20130224337A1 (en) * 2010-09-06 2013-08-29 Thoma Siegfried Method for flavouring syrup
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US9412050B2 (en) * 2010-10-12 2016-08-09 Ncr Corporation Produce recognition method
CN104703957A (zh) * 2012-10-12 2015-06-10 嘉吉公司 用于减少黄曲霉毒素污染的玉米的方法和装置
US20150090642A1 (en) * 2012-10-12 2015-04-02 Cargill, Incorporated Method and apparatus for reducing aflatoxin-contaminated corn
US8919569B2 (en) * 2012-10-12 2014-12-30 Cargill, Incorporated Method and apparatus for reducing aflatoxin-contaminated corn
EP2906524A4 (de) * 2012-10-12 2016-05-18 Cargill Inc Verfahren und vorrichtung zur reduzierung von aflatoxin-kontaminiertem mais
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US9538777B2 (en) * 2012-10-12 2017-01-10 Cargill, Incorporated Method and apparatus for reducing aflatoxin-contaminated corn
US20140102950A1 (en) * 2012-10-12 2014-04-17 Cargill, Incorporated Method and apparatus for reducing aflatoxin-contaminated corn
US20150239683A1 (en) * 2014-02-24 2015-08-27 Ltw Intralogistics Gmbh Method for the partial emptying of buoyant objects and device for carrying out the method
US9809400B2 (en) * 2014-02-24 2017-11-07 Ltw Intralogistics Gmbh Method for the partial emptying of buoyant objects and device for carrying out the method
US9840376B2 (en) * 2014-08-19 2017-12-12 Compac Technologies Limited Singulation apparatus and method
CN105921255A (zh) * 2016-06-23 2016-09-07 云南翰林仁泽环保工程有限公司 垃圾水力分选一体机
US10987699B2 (en) * 2016-11-08 2021-04-27 Jesús Sánchez Rodríguez Density separator for waste material

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GB1334248A (en) 1973-10-17
SE375247B (de) 1975-04-14
FR2079225B1 (de) 1976-02-06
DE2056130A1 (de) 1971-08-26
CH521794A (de) 1972-04-30
FR2079225A1 (de) 1971-11-12
JPS505815B1 (de) 1975-03-07
CA930333A (en) 1973-07-17

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