Classifications

• • 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
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D1/00—Flotation
  • B03D1/001—Flotation agents
  • B03D1/004—Organic compounds
  • B03D1/01—Organic compounds containing nitrogen
• • 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
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D2203/00—Specified materials treated by the flotation agents; Specified applications
  • B03D2203/02—Ores
  • B03D2203/04—Non-sulfide ores

Definitions

• This invention relates to the concentration of iron minerals by froth flotation using a mixture of water dispersable acid salts of normal-alkyl primary amines having to 12 successive chain lengths of 8 to 22 carbon atoms, the major proportion of the constitents being near the center of the chain length range.
• flotation agents we have found it is possible to obtain a higher selectivity of silica and thus produce better recovery of the iron than has been obtained with currently used collecting agents.
• Froth flotation is well known in the art for separating or concentrating minerals from ore. Prior to flotation, the ore is ground, pulped in water, and sometimes, depending upon the nature of the ore being treated, preconditioned with starch or dextrin which is a depressant for the desired iron portion of the ore.
• a collector and a frothing agent are added to the ore dispersed in water and air is introduced into the pulp to form a froth, the silica-rich froth being floated away from the desired iron mineral residue, and the step repeated,
• an object of this invention is to use acid salts of a mixture of normal-alkyl primary amineshaving 5 to 12 successive chain lengthsincluding both odd and even numbered carbon chains of 8 to 22 carbon atoms, the major proportion of the constituents being near the center of the chain length range, as collectors in the concentration of iron by froth flotation processes.
• Another object is to use such materials as silica collectors in the froth flotation of iron ore.
• Another object of this invention is to provide' a novel composition of normal-alkyl primary amines to provide highly selective collectors of silica.
• R isan alkyl group having 8 to 22 carbon atoms
• A is the salt forming anion of an acid
• n is an integar equal to the valence of said an ion.
• the amine be totally neutralized, in some cases 12 to 50 percent neutralization renders the amine water dispersable. It is preferred that the amine be 50 to 100 percent neutralized.
• Suitmajor constituents as C and C The amines used in this invention are suitably prepared from'synthetic fatty acid mixtures which contain both odd ,and even numbered successive chain lengths.
• Synthetic fatty acids are commerically available and are derived from paraffin waxes by air oxidation.
• the amines are produced from the acids by conventional methods. Such mixtures are different from those previously available from natural sources which only contain substantial amounts of even numbered chain lengths. It appears to be a requirement of this invention that the successive odd and even numbered carbonchainsbe present. 1 i l
• the process of this invention is carried out underwell known techniques of froth flotation. In the case of mag netite ore the natural pH is slightly basic and it is generally not necessary to adjust pH for flotation. When using hematite ore it is usually necessary to adjust the pH to about 9 to ll by addition of a base such as NaOH. Gen-erally used cell speeds and temperatures according to known flotation techniques are suitable.
• the concentration of amine salt used is about 0.01 lb. to 2.0 lbs. per ton of ore,.the preferred range being about 0.1 to 0.5 lb. per-ton of ore.
• EXAMPLE I Magnetite concentrate ore samples were received with an average of 10 wt. percent water. The ores were 'thenblended and head samples taken. Analysis showed that the ore averaged about wt. percent iron by wet analysis and 8.5 to 10 wt. percentsilica by X-ray diffraction. No. sizing studies were undertaken, although the ground ore averaged percent passing 325 mesh. The orebody varied considerably in its gauge composition but is generally reported to hold about equal amounts of silica and iron silicates as the gangue material. The major iron silicate minerals and their silica content are as follows:
• Flotation was carried out for three minutes with sufficient aeration for the froth to reach the lip of the cell.
• This floated product is known as the first Rougher Froth.
• the unfloated ore was re-pulped to float solids and using the same procedure, one-fourth of the amount of collector indicated in Table l and 0.025 lbs. per ton of frother were added, followed by conditioning and flotation.
• This product is known as the second Rougher Froth.
• the ore is re-pulped to float solids and the second Rougher Froth procedure'is duplicated to produce the third Rougher Froth.
• Both the cell content (the iron concentrate) and the three froth products are separately filtered, dried, weighed and samples are taken for analysis of iron by wet analysis and for silica by X-ray diffraction.
• Table I shows analysis of second and third floats.
• EXAMPLE 11 Using magnetite ore as described in Example 1, flotations were carried out as described in Example 1 using normal single chain length amine acetates percent neutralized as a flotation agent for three floats for comparison with the mixtures of alkyl chain lengths according to this invention. 1t can be seen in Table 11 that the individual chain length amine salts did not produce the very satisfactory results obtained by use of mixtures of the same chain length'amine salts shown in Example I.
• a froth flotation process for separating silica from iron ore which comprises froth flotation of said ore in an aqueous medium containing a mixture of water dispersable acid salts of normal-alkyl primary amines having 5 to 12 successive chain lengths including both odd and even numbered carbon chains of 8 to 22 carbon atoms, the major proportion of the constituents being near the center of the chain length range with at least two of said center chain lengths of said mixture comprising between l2.9 and 25 percent (by weight) each, and, floating the silica from said ore. 10

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• Manufacture And Refinement Of Metals (AREA)
• Silicon Compounds (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22509574

Family Applications (1)

Country Status (4)

Cited By (5)

• 1971
  • 1971-05-18 US US00144663A patent/US3744629A/en not_active Expired - Lifetime
• 1972
  • 1972-05-17 ES ES402839A patent/ES402839A1/es not_active Expired
  • 1972-05-17 CA CA142,411A patent/CA961179A/en not_active Expired
  • 1972-05-18 FR FR7217919A patent/FR2138118B1/fr not_active Expired

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