US2972408A - Process and apparatus for purifying suspensions of fine magnetizable particles in a liquid - Google Patents

Process and apparatus for purifying suspensions of fine magnetizable particles in a liquid Download PDF

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Publication number
US2972408A
US2972408A US525701A US52570155A US2972408A US 2972408 A US2972408 A US 2972408A US 525701 A US525701 A US 525701A US 52570155 A US52570155 A US 52570155A US 2972408 A US2972408 A US 2972408A
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United States
Prior art keywords
fraction
particles
liquid
magnetizable particles
suspension
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Expired - Lifetime
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US525701A
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English (en)
Inventor
Krijgsman Centinus
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Stamicarbon BV
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Stamicarbon BV
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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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/01—Wet separation

Definitions

  • the present invention relates to a process and apparatus for purifying suspensions of fine magnetizable particles in a liquid, which suspension is contaminated by particles of non-magnetizable material, in which process the suspension to be purified is separated with the help of a magnetic separator into a fraction rich in magnetizable particles and another poor in such particles, which latter fraction is subjected to a further treatment in order to recover at least part of the magnetizable particles which were left in this fraction.
  • Such a process is applied in coal and ore washeries, where the raw product is separated into a specifically light and a specifically heavy fraction by means of a suspension of magnetic or ferrosilicon in water. After the separation the suspension contains contaminations in the form of fine particles of the material which was separated, which particles have to be removed before the suspension is returned into the separating apparatus.
  • the suspension is introduced into a magnetic separator which removes the majority of the mag-,
  • the present invention provides a regenerating apparatus comprising only one magnetic separator, while the loss of magnetizable particles is not greater than that occurring in the conventional apparatus with two magnetic separators.
  • FIG. 1 represents a separating apparatus in which raw coal is separated with the help of a magnetite suspension into washed coal and shale.
  • the raw coal to its atent be washed is fed in at A, the resulting coal and shale fractions being discharged from the separator at Band C respectively.
  • an amount of suspension obtained by rinsing of the separated fractions is discharged in dliute form from the separating apparatus, in' order tobe purified and thickened to the specific gravity required.
  • This type of separating apparatus is well known, and is not a part of the present invention.
  • This suspension is conductive to a sieve bend 3 through a conduit 2.
  • the overflow from the sieve bend 3 contains the coarser non-magnetizable particles, and moreover about 10 percent of the liquid and the magnetite. At 7 this fraction is fed into a magnetic separator 8. At this concentration the efficiency of a magnetic separator is about 98 percent, so that another 9.8 percent of the magnetite is collected in the tank 9, which amount is subsequently led through a conduit 10 to the thickener 6. The fraction of nonmagnetizable particles collected in tank 11 then contains only 0.2 percent of the magnetic originally present in the suspension. This fraction is tangentially supplied to a sieve bend 13 through a conduit 12.
  • the efiiciency of the secondary separation is only about percent owing to the low magnetic concentration, so that 0.04 percent of the magnetite is lost in the waste water.
  • the application of the present invention has another advantage consisting in a smaller power consumption, as the cost of electric current is lower and the loss of height is smaller, which involves a lowering of pumping cost.
  • part of the liquid is drained.
  • part of the overflow from the thickener 6 is drained.
  • This overflow is practically free of magnetite.
  • at least part of this liquid is supplied through a conduit 17 to the inlet of sieve bend 13, so that this apparatus receives a sufiicient amount of liquid to be capable of giving the desired screening efiiciency.
  • this apparatus receives a sufiicient amount of liquid to be capable of giving the desired screening efiiciency.
  • the thickened suspension is returned to the separating apparatus, as is part of the overflow from the thickener, which returns through the conduit 20 and serves for rinsing the separated coal and shale fractions.
  • a process for purifying suspensions of fine magnetizable particles in liquid, which suspensions are contaminated by coarser particles of non-magnetizable materials which comprises the steps of pretreating the suspension to obtain an undersize fraction containing a major portion of the liquid and magnetizable particles and an oversize fraction containing the remaining liquid and magnetizable particles and the coarser particles of non-magnetizable materials, subjecting the oversize fraction to magnetic separation to obtain a first fraction containing a major portion of the remaining magnetizable particles and a second fraction containing the coarser particles of non-magnetizable materials and the remain ing magnetizable particles in said oversize fraction and then feeding said second fraction to a sieve bend to sep-- arate a major portion of the magnetizable particles therefrom.
  • Apparatus for purifying suspensions of fine magnetizable particles in liquid which suspensions are con taminated by coarser particles of non-magnetizable materials comprising means for pretreating the suspension to obtain an undersize fraction containing a major portion of the liquid and magnetizable particles and an oversize fraction containing the remaining liquid and magnetizable particles and the coarser particles of nonmagnetizable materials, a magnetic separator suitable for treatment of a liquid suspension containing magnetizab-le particles to obtain a first fraction containing a major portion of the magnetizable particles and a second fraction containing coarser particles of non-magnetizable materials and the remaining magnetizable particles, means for conveying the oversize fraction obtainedfrorn said pretreating means to said magnetic separator, a sieve bend, and means for conveying the second fraction obtained from said magnetic separator therefrom and feeding said second fraction to said sieve bend to thereby obtain an overflow fraction and an underflow fraction containingamajor portion of magnetizable particles.
  • pretreating means comprises a sieve bend.
  • conduit means for receiving the underflow fraction from said sieve bend and recirculating the latter to said pretreating means.

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  • Soft Magnetic Materials (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US525701A 1954-08-11 1955-08-01 Process and apparatus for purifying suspensions of fine magnetizable particles in a liquid Expired - Lifetime US2972408A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2972408X 1954-08-11

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US2972408A true US2972408A (en) 1961-02-21

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US525701A Expired - Lifetime US2972408A (en) 1954-08-11 1955-08-01 Process and apparatus for purifying suspensions of fine magnetizable particles in a liquid

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US (1) US2972408A (fr)
FR (1) FR1129352A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483249A1 (fr) * 1980-05-28 1981-12-04 Rauma Repola Oy Procede et equipement pour epaissir une suspension ou une pate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2016662B3 (es) * 1987-02-07 1990-11-16 Siemens Ag Procedimiento para la extraccion de metales pesados de fondos cargados y dispositivo para la extraccion del contracorriente en un procedimiento semejante

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1135304A (en) * 1909-10-04 1915-04-13 Jeffrey Mfg Co Separator.
US1295857A (en) * 1917-06-23 1919-03-04 Augustus P Craft Process of treating zinc ores.
GB264536A (en) * 1926-01-18 1927-09-22 Antoine France Improvements in apparatus for classifying ores and the like
US2206980A (en) * 1938-03-31 1940-07-09 Minerals Beneficiation Inc Gravity sei aration of ores
US2325149A (en) * 1940-07-29 1943-07-27 Minerals Beneficiation Inc Process of separating ores
US2429436A (en) * 1944-08-31 1947-10-21 American Cyanamid Co Combined gravity classification and screening of ore
US2835384A (en) * 1953-06-13 1958-05-20 Klaas F Tromp Process for recovery and purifying of finely divided heavy materials
US2872041A (en) * 1954-06-22 1959-02-03 Stamicarbon Screen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1135304A (en) * 1909-10-04 1915-04-13 Jeffrey Mfg Co Separator.
US1295857A (en) * 1917-06-23 1919-03-04 Augustus P Craft Process of treating zinc ores.
GB264536A (en) * 1926-01-18 1927-09-22 Antoine France Improvements in apparatus for classifying ores and the like
US2206980A (en) * 1938-03-31 1940-07-09 Minerals Beneficiation Inc Gravity sei aration of ores
US2325149A (en) * 1940-07-29 1943-07-27 Minerals Beneficiation Inc Process of separating ores
US2429436A (en) * 1944-08-31 1947-10-21 American Cyanamid Co Combined gravity classification and screening of ore
US2835384A (en) * 1953-06-13 1958-05-20 Klaas F Tromp Process for recovery and purifying of finely divided heavy materials
US2872041A (en) * 1954-06-22 1959-02-03 Stamicarbon Screen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2483249A1 (fr) * 1980-05-28 1981-12-04 Rauma Repola Oy Procede et equipement pour epaissir une suspension ou une pate
US4343708A (en) * 1980-05-28 1982-08-10 Rauma-Repola Oy Method and equipment for thickening of suspension or pulp

Also Published As

Publication number Publication date
FR1129352A (fr) 1957-01-21

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