US2216040A - Beneficiation of phosphate rock by froth flotation - Google Patents
Beneficiation of phosphate rock by froth flotation Download PDFInfo
- Publication number
- US2216040A US2216040A US326660A US32666040A US2216040A US 2216040 A US2216040 A US 2216040A US 326660 A US326660 A US 326660A US 32666040 A US32666040 A US 32666040A US 2216040 A US2216040 A US 2216040A
- Authority
- US
- United States
- Prior art keywords
- flotation
- phosphate
- slime
- desliming
- phosphate rock
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002367 phosphate rock Substances 0.000 title description 11
- 238000009291 froth flotation Methods 0.000 title description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 26
- 238000005188 flotation Methods 0.000 description 22
- 229910019142 PO4 Inorganic materials 0.000 description 20
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 20
- 239000010452 phosphate Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 239000000377 silicon dioxide Substances 0.000 description 12
- 238000005498 polishing Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 9
- 238000013019 agitation Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 241001092591 Flota Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Images
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
- B03D1/02—Froth-flotation processes
- B03D1/021—Froth-flotation processes for treatment of phosphate ores
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
Definitions
- This invention relates to the beneiiciation of phosphate ore by flotation and more particularly to phosphate flotation processes in which the' silicious gangue is floated away from the phos- 5 phate.
- Benefciation of phosphate rock by flotation processes was first effected by floating the phosphate away from the silicious gangue using reagents capable of promoting the flotation of such compounds.
- the problem of slime in the ordinary phosphate flotation was not a particularly serious one and the simple methods of partial desliming which are current in ore dressing practice were suihcient to produce a satisfactory feed that could be handled in flotation machines.
- phosphate feed is rst deslimed more or less completely, so as to recover the majorportion of primary slime.
- the first step maybe carried out in any suitable apparatus which is capable ot removing a major portion of slime. It is an advantage of the present inven- 35 tion that it utilizes standard equipment such as classifiers, a hydroseparator or thickener, centrifuges, screens, and the like, and no new equipment or type of procedure is necessary.
- the polishing can be effected in any suitable device 'which will subject the surface of the phosphate particles to suitable friction.
- agitators, mixers, mechanical flotation machines, and similar devices may be used and again it is not necessary to employ any 45 critical technique and standard ore dressing equipment can be used.
- the third step of the process requires a very complete deslixning and for this purpose it is necessary to use procedures and apparatus which 50 are capable of desliming to the desired degree. preferably leaving less than V2% of secondary slime. While the invention is not limited in this step to any particular design of apparatus, we have found that very effective desliming can be tive tests and using identical feed from Florida pebble phosphate rock.
- Example 1 Florida pebble phosphate was subjected to polishing in a mechanical flotation machine without admission of air for a period of two minutes. The feed was then deslimed as completely as possible in a hindered settling classifier and was subjected to froth flotation in a Fagergren otation machine using about .46 of a pound of a higher aliphatic amine per dry ton of feed as a flotation promoter, in conjunction with suicient frother to produce a satisfactory froth. 489 parts by weight of feed gave a silica concentrate of 123 parts and a phosphate tail of 263 parts containing 11% of insoluble material. Such a phosphate tailing would represent a relatively poor flotation eflciency.
- Example 2 The same feed was subjected to preliminary desliming leaving only a per cent or two of primary slime. This deslimed material was then subjected to polishing in the same mechanical flotation machine as was used in Example 1 and for the same period of time. Thereupon this pollsned material was subjected to desliming in a hindered settling classifier reducing the amount of slime to the minute per cent as in Example 1.
- a method of beneficiating phosphate ore by flotation of a silica containing concentrate therefrom which comprises subjecting phosphate rock to a preliminary desliming operation to separate primary slime, polishing the deslimed material to remove the secondary slime forming the surfaces of the phosphate particles, desliming the polished material and subjecting this deslimed material to froth flotation in the presence of a promoter for silica.
- a method of beneciating phosphate ore by flotation of a silica containing concentrate therefrom which comprises subjecting the phosphate rock to a preliminary desliming operation to separate primary slime, polishing the deslimed material in a mechanical otation machine from which the air has been shut oft to remove the secondary slime forming the surfaces of the phosphate particles, desliming the polished material and subjecting this deslimed material to froth flotation in the lpresence of a promoter for silica.
Description
Sept 24, 1940 H. l.. MEAD ET A1. 2,215,040
BENEFICIATION OF PHOSPHATE ROCK BY FROTH FLOTATION Filed .March 29, 1940 Patented Sept. 24, 1940 BENEFICIATION OF PHOSPHATE ROCK BY FROTH FITATION nan-y L. Mesa and lernen.l :.Mauee Brewster,
Fla., assignors to American Gyanamid Company, New York, N. Y., a corporation of Maine Application March 29, 1940, Serial No.- 326,660
4 Claims. (Cl. 209-166) This invention relates to the beneiiciation of phosphate ore by flotation and more particularly to phosphate flotation processes in which the' silicious gangue is floated away from the phos- 5 phate.
Benefciation of phosphate rock by flotation processes was first effected by floating the phosphate away from the silicious gangue using reagents capable of promoting the flotation of such compounds. The problem of slime in the ordinary phosphate flotation was not a particularly serious one and the simple methods of partial desliming which are current in ore dressing practice were suihcient to produce a satisfactory feed that could be handled in flotation machines.
When, however, it was attempted to oat the silica away from the phosphate using the silica promoters which have been developed in recent years, it was found that slime played a much more important and much more critical part than it does in ordinary phosphate flotation, and the ordinary desliming methods which are entirely satisfactory for ore dressing operation in general, were totally inadequate for silica flotations because less than 1% of slime can have a very serious adverse effect on the efficient flotation of silica. This problem was appreciated and various processes of silica flotation involving a very complete desliming were tried with markedly improved results. 'I'he present case is not concerned broadly with the complete desliming of raw phosphate rock prior to flotatiomvthis forming the subject matter of the copending application of Erickson, Serial No. 325,011, filed March 20, 1940, and the particular methods of d'esliming being described in our copending application Serial No. 320,121, filed February 21, 1940.
In spite of the marked improvement which was obtained by a very complete desliming of the phosphate feed, it was found that there was still a tendency for interference with the flotation operation by slime formed in the flotation machine itself due to the agitation of the phosphate particles which removes a small amount of slimy material from their surfaces. Further investigations showed that this formation of secondary slime was largely connned to the surface of the particles, that is to say. phosphate rock particles contain a rather thin illm on the surface of readily dislntegratable material which forms slime very readily, but underneath this layer the rock is relatively more resistant and it is based on this work that the process of the present invention was developed.
5s According to the present invention phosphate feed is rst deslimed more or less completely, so as to recover the majorportion of primary slime.
It is then subjected to an agitation, for example in a flotation machine without the introduction of air or any other similar device which effects a I polishing of the surface of the phosphate particles removing the layer of slime forming material. 'Ihis operation is then followed by the veryzcomplete desliming of the secondary slime producing a feed which is relatively unaffected by 10 the further agitation of ordinary flotation procedures.
It might appear at rst examination as though the same result could be obtained if the raw feed were subjected to a polishing action fol- 1I lowed by desliming and in point of fact in ordinary operation on phosphate rock which contains some coarse material, there is a considerable degree of rubbing in the log washers which might be thought at first to effect polishing. We 20 have found, however, that the primary slimes` appear to have lubricating or protecting action on the surface of the phosphate particles and except where commercially impractical polishing times are used, it is not feasible to remove the 25 secondary slime forming material from the surfaces of the phosphate particles without preliminary desliming to remove the major portion of the primary slime.
In the three steps of the present invention, 30 that is, removing primary slime, polishing, and then removing secondary slime, the first step maybe carried out in any suitable apparatus which is capable ot removing a major portion of slime. It is an advantage of the present inven- 35 tion that it utilizes standard equipment such as classifiers, a hydroseparator or thickener, centrifuges, screens, and the like, and no new equipment or type of procedure is necessary. Again in the second step, the polishing can be effected in any suitable device 'which will subject the surface of the phosphate particles to suitable friction. Thus, agitators, mixers, mechanical flotation machines, and similar devices may be used and again it is not necessary to employ any 45 critical technique and standard ore dressing equipment can be used.
The third step of the process requires a very complete deslixning and for this purpose it is necessary to use procedures and apparatus which 50 are capable of desliming to the desired degree. preferably leaving less than V2% of secondary slime. While the invention is not limited in this step to any particular design of apparatus, we have found that very effective desliming can be tive tests and using identical feed from Florida pebble phosphate rock.
Example 1 Florida pebble phosphate was subjected to polishing in a mechanical flotation machine without admission of air for a period of two minutes. The feed was then deslimed as completely as possible in a hindered settling classifier and was subjected to froth flotation in a Fagergren otation machine using about .46 of a pound of a higher aliphatic amine per dry ton of feed as a flotation promoter, in conjunction with suicient frother to produce a satisfactory froth. 489 parts by weight of feed gave a silica concentrate of 123 parts and a phosphate tail of 263 parts containing 11% of insoluble material. Such a phosphate tailing would represent a relatively poor flotation eflciency.
Example 2 The same feed was subjected to preliminary desliming leaving only a per cent or two of primary slime. This deslimed material was then subjected to polishing in the same mechanical flotation machine as was used in Example 1 and for the same period of time. Thereupon this pollsned material was subjected to desliming in a hindered settling classifier reducing the amount of slime to the minute per cent as in Example 1.
insoluble and was therefore of a very good commercial grade.
In the exampl an ordinary aliphatic amine flotation promoter is described. The invention is not limited to the use of any promoter but is generally applicable to all promoters for silica such as those described in the copending applications of Erickson, Jayne and Day, Serial No. 326,953, led March 30, 1940, and Christmann, Jayne and Erickson, Serial No. 326,952, filed March 30, 1940, the Quaternary ammonium salts described in the Lenher Patent No. 2,132,902 and the like. It is an advantage of the present invention that improved results Vare obtainedwith any of the normal silica promoters. The exact grade and recoveries will of course vary from promoter to promoter.
What we claim is:
1. A method of beneficiating phosphate ore by flotation of a silica containing concentrate therefrom which comprises subjecting phosphate rock to a preliminary desliming operation to separate primary slime, polishing the deslimed material to remove the secondary slime forming the surfaces of the phosphate particles, desliming the polished material and subjecting this deslimed material to froth flotation in the presence of a promoter for silica.
2. A method of beneciating phosphate ore by flotation of a silica containing concentrate therefrom which comprises subjecting the phosphate rock to a preliminary desliming operation to separate primary slime, polishing the deslimed material in a mechanical otation machine from which the air has been shut oft to remove the secondary slime forming the surfaces of the phosphate particles, desliming the polished material and subjecting this deslimed material to froth flotation in the lpresence of a promoter for silica.
3. A method according to claim 1 in which the removal of the secondary slime is effected in a hindered settling classifier.
4. A method according to claim 2 in which D l S C L1A lM E R 2,216,040.-Harry L. Mead and Ernest Maust, Brewster, F1a.. BENEFICITION 0F PHOSPHATE ROCK BY FROTH FLoTA'rIoN. Patent dated September 24, 1940. Disclaimer filed June 4, 1942, by the assignee, American Uyamm'zd Company. Hereby disclaims claim 1.
[Ojcal Gazette June 80, 1.942.]
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US326660A US2216040A (en) | 1940-03-29 | 1940-03-29 | Beneficiation of phosphate rock by froth flotation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US326660A US2216040A (en) | 1940-03-29 | 1940-03-29 | Beneficiation of phosphate rock by froth flotation |
Publications (1)
Publication Number | Publication Date |
---|---|
US2216040A true US2216040A (en) | 1940-09-24 |
Family
ID=23273142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US326660A Expired - Lifetime US2216040A (en) | 1940-03-29 | 1940-03-29 | Beneficiation of phosphate rock by froth flotation |
Country Status (1)
Country | Link |
---|---|
US (1) | US2216040A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2562024A (en) * | 1945-04-03 | 1951-07-24 | Vanadium Corp Of America | Process for concentrating carnotite ores |
US4436616A (en) | 1980-11-06 | 1984-03-13 | Philippe Dufour | Process for the beneficiation of phosphate ores |
US4932433A (en) * | 1987-07-01 | 1990-06-12 | Masco Corporation | Mechanism to cover and protect the internal operating parts of faucets operated by a single bidirectional control lever |
-
1940
- 1940-03-29 US US326660A patent/US2216040A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2562024A (en) * | 1945-04-03 | 1951-07-24 | Vanadium Corp Of America | Process for concentrating carnotite ores |
US4436616A (en) | 1980-11-06 | 1984-03-13 | Philippe Dufour | Process for the beneficiation of phosphate ores |
US4932433A (en) * | 1987-07-01 | 1990-06-12 | Masco Corporation | Mechanism to cover and protect the internal operating parts of faucets operated by a single bidirectional control lever |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2293640A (en) | Process of concentrating phosphate minerals | |
US3830366A (en) | Mineral flotation with sulfosuccinamate and depressent | |
US4043902A (en) | Tri-carboxylated and tetra-carboxylated fatty acid aspartates as flotation collectors | |
US4436616A (en) | Process for the beneficiation of phosphate ores | |
US2216040A (en) | Beneficiation of phosphate rock by froth flotation | |
US2676705A (en) | Concentration of phosphate ores | |
US2074699A (en) | Flotation process | |
US2483192A (en) | Froth flotation of iron impurities from feldspar | |
US2410376A (en) | Beneficiation of iron ores | |
US2065053A (en) | Flotation frother | |
US2461813A (en) | Concentration of phosphate minerals | |
US2951585A (en) | Separation of pyrochlore from calcite, apatite and silica | |
US3710934A (en) | Concentration of spodumene using flotation | |
US2682337A (en) | Froth flotation of phosphate values involving ph control | |
US3078997A (en) | Flotation process for concentration of phenacite and bertrandite | |
US2369311A (en) | Flotation of acidic minerals | |
US2423022A (en) | Froth flotation of silica from iron ore by anionic collectors | |
US3099620A (en) | Wet beneficiating of phosphate ores | |
US2389727A (en) | Flotation of iron ores | |
US2295459A (en) | Flotation process | |
US2330158A (en) | Concentration of potash ores | |
US2293470A (en) | Froth flotation of siliceous material | |
US2313360A (en) | Process of concentrating nonmetalliferous ores | |
US2414815A (en) | Beneficiation of beryllium ores | |
US3088590A (en) | Wet beneficiating of phosphate ores |