GB2174019A - Improvements in froth flotation - Google Patents
Improvements in froth flotation Download PDFInfo
- Publication number
- GB2174019A GB2174019A GB08510084A GB8510084A GB2174019A GB 2174019 A GB2174019 A GB 2174019A GB 08510084 A GB08510084 A GB 08510084A GB 8510084 A GB8510084 A GB 8510084A GB 2174019 A GB2174019 A GB 2174019A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- mineral
- coal
- froth flotation
- ofthe
- 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.)
- Granted
Links
- 238000009291 froth flotation Methods 0.000 title claims abstract description 26
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 40
- 239000011707 mineral Substances 0.000 claims abstract description 40
- 239000000654 additive Substances 0.000 claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 23
- 230000000996 additive effect Effects 0.000 claims abstract description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005864 Sulphur Substances 0.000 claims abstract description 13
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000005188 flotation Methods 0.000 claims description 6
- 125000002467 phosphate group Chemical class [H]OP(=O)(O[H])O[*] 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 5
- 239000012991 xanthate Substances 0.000 claims description 5
- 229910001413 alkali metal ion Inorganic materials 0.000 claims description 4
- 125000004429 atom Chemical group 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 4
- 125000005842 heteroatom Chemical group 0.000 claims description 4
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 229910002651 NO3 Inorganic materials 0.000 claims description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- RYYWUUFWQRZTIU-UHFFFAOYSA-N Thiophosphoric acid Chemical class OP(O)(S)=O RYYWUUFWQRZTIU-UHFFFAOYSA-N 0.000 claims description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- 150000002148 esters Chemical class 0.000 claims description 3
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 235000021317 phosphate Nutrition 0.000 claims description 3
- 229920000151 polyglycol Polymers 0.000 claims description 3
- 239000010695 polyglycol Substances 0.000 claims description 3
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 3
- 150000003573 thiols Chemical class 0.000 claims description 3
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 2
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 2
- 229930195725 Mannitol Natural products 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 2
- 230000002411 adverse Effects 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000007796 conventional method Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 150000002430 hydrocarbons Chemical class 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 239000000594 mannitol Substances 0.000 claims description 2
- 235000010355 mannitol Nutrition 0.000 claims description 2
- 229910021645 metal ion Inorganic materials 0.000 claims description 2
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 2
- 238000005065 mining Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 239000010802 sludge Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 229910001415 sodium ion Inorganic materials 0.000 claims description 2
- 239000000600 sorbitol Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 125000002947 alkylene group Chemical group 0.000 claims 1
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
- B03D1/012—Organic compounds containing sulfur
-
- 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
- B03D1/014—Organic compounds containing phosphorus
-
- 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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/02—Collectors
-
- 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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/04—Frothers
-
- 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
- B03D2203/08—Coal ores, fly ash or soot
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The froth flotation of minerals is improved by the use of an additive which is of general formula (I> A-X-B (I> in which A is a group capable of adhering to the surface of a hydrophilic mineral, X is a direct bond or an intermediate group or atom and B is an inorganic or organic polar group having hydrophilic properties. The additive enhances separation of relatively hydrophilic minerals from relatively hydrophilic minerals, and is especially useful for the removal of pyritic sulphur from coal.
Description
SPECIFICATION
Improvements in froth flotation
This invention concerns improvements in froth flotation; more especially it concerns the selective removal of pyritic sulphur in the froth flotation of coals.
The froth flotation of minerals is well established.
Fine mineral is dispersed in a water bath which is subjected to streams of air bubbles. Under ideal conditions the desired mineral orfraction of crude mineral is carried by attachmentto air bubbles to the surface of the bath, where a semi-stable froth is formed, and the mineral is recovered from the froth. It is invariably the case in commercial froth flotation processes to add substances known as "collectors" and very common to add "frothers", in orderto increase or establish better air bubble attachment and improve the sepa ration of wanted mineral from water and possiblyfrom unwanted mineral. Thus, in the froth flotation of coal, it is common to use a hydrocarbon collector in order two increase the natural hydrophobic nature of the coal.Also, in the recovery of metal ores byfroth flotation, manyofthe metalsare present as salts or oxides which are hydrophilic, so that a collector which attaches to the metal ore and creates a hydrophobic layer or part-layer on the ore is recommended.
It is now proposed to use an additive in the froth flotation of minerals, which is intended to enhance the hudrophilic nature of associated minerals in order to emphasise the separation of mineral recovered from the froth and mineral forming the sludge ortailings at the bottom ofthefroth flotation cell.
Accordingly, the present invention provides a froth flotation additive ofthe general formula A- X- B (I), in which
A is a group capable of adhering to the surface of a hydrophilic mineral, Xis a direct bond or an intermediate group or atom, and B isan inorganicororganispolargroup having hydrophilic properties.
The additives ofthe invention may or may not be known compounds, but it is not believed that they have previously been proposed for use in the froth flotation of minerals.
Preferably, Group A is capable of attaching to and adhering to pyritic sulphur in the mineral. Suitable groups may be selected from those falling underthe general descriptions of xanthates, carbonates and thiocarbonates, ca rboxyl and thiocarboxyl groups, thiols, phosphates and thiophosphates, and may be, for example, any ofthe groups shown in column A of the accompanying drawings and in which M+ is a metal ion, preferably an alkali metal ion and especially a sodium ion.
The linkX may be a single or a double bond, or any group oratom (e.g. nitrogen, oxygen, sulphur or phosphorus) which does not adversely affectthe hydrophilic nature of Group B orthe desired activity of
Group A. Lower alkyl (straight chain or branched) groups of 1 to 5 carbon atoms may be used, alone or
incorporating hetero-atoms such as nitrogen, oxygen, sulphurorphosphorus. TheX group may be ormay include a cyciic structure such as a saturated or unsaturated ring, with or without hetero-atoms.
The hydrophilic Group B may be selected from a wide range of organic and inorganic hydrophilic groups, including particularly polyglycols, akylene oxide chains, hydroxyl, carboxyl, esters, sulphate, carbonate, nitrate and phosphate groups. Reference is made to column B ofthe accompanying drawing, in which M+ is as defined above, R1 is a hydrogen atom ora methyl group and R1' isa loweralkyl group, especially a methyl group.
Suitable additives may be synthesised using conventional methods, if they are not commercially available. For example, xanthate additives may be synthesised by the reaction scheme: BOH + M+ Ooh + CS2 BOCS - +++++ M+ + H2O where BOH may be a polyethylene glycol of general formula H (OCH2- CH2) N-- OH where n has a value from 1 to 50, or BOH is sorbitol or mannitol.
The additives ofthe invention may be used with conventional collectors and frothers, although normal trialsto find the most suitable combinations forthe mineral(s) to be treated, and the most suitable concentrations, will be necessary. Concentrations of additive are expected to be in the range 0.1 to 10%, preferably 0.5 to 5%, by weight of the combined frotherand/or collector. The additive may be added to the cell alone or in combination with the collector andlorfrotherconventionally used. Ofcourse,the additive may be a mixture of compounds ratherthan a single compound.The invention has particular ap plication to the removal of pyritic sulphurfrom coal, especially coal for power generation. Modern mechanised coal mining techniques produce large amounts of fine coal which have to be recovered from coal-water dispersions produced by conventional coal preparation and washing. It is estimated thatthe best additives ofthe present invention will reduce by about 50% the sulphur content of coal recovered from froth flotation cells. The remainder ofthe sulphur in coal is organically bound sulphurwhich is not amenable to removal by washing methods of coal cleaning. This has a very significant economic significance, since judicious use ofthe additive may avoid the installation of capital intensive post-combustion purification plant at power generation stations.
1. An improvedfroth flotation method, comprising the treatment of an aqueous fine mineral slurry by froth flotation in the presence of an additive which is of general formula (I).
A-X- B (I) in which A is a group capable of adhering to the surfaceofa hydrophilic mineral, Xis a direct bond oran intermediate group or atom, and
B is an inorganic or organic polar group having hydrophilic properties.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
1. An improvedfroth flotation method, comprising the treatment of an aqueous fine mineral slurry by froth flotation in the presence of an additive which is of general formula (I).
A-X- B (I) in which A is a group capable of adhering to the surfaceofa hydrophilic mineral, Xis a direct bond oran intermediate group or atom, and
B is an inorganic or organic polar group having hydrophilic properties.
2. A method according to claim 1, wherein the mineral is coal.
3. A method according to claim 1 or2, wherein the group A is capable of attaching and adhering to pyritic sulphur in the mineral.
4. A method according to claim 3, wherein group 1 is selected from xanthates, carbonates, thiocarbonates, carboxyl and thiocarboxyl groups, thiols, phosphates and thiophosphates.
5. Amethod according to claim 3,whereingroupA isselectedfromthe list given in accompanying drawing, and wherein M+ is an alkali metal ion
6. A method according to claim 4 or 5, wherein group A is a xanthate group.
7. A method according to anyone of the preceding claims, wherein the group B is selected from polyglycols, alkylene oxide chains, hydroxyl, carboxyl, esters, sulphate, carbonate, nitrate and phosphate groups.
8. A method according to claim 7, wherein group B Tsselected from the listgiven in the accompanying drawing, and wherein R' is a hydrogen atom ora methyl group, R" is a loweralkyl group, and M+ is an alkali metal ion.
9. Amethod accordingtoanyoneofthepreceding claims, wherein the additive is used in an amount of 0.5 to 5% by weight ofthe froth flotation frother and/or collector.
10. A method according to any one ofthe preceding claims, wherein fine coal for powergeneration is cleaned and a significant proportion ofthe pyritic sulphur in the free coal-is removed in the froth flotation tailings.
11. Amethodaccordingtoclaim 1, substantially as hereinbefore described.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08510084A GB2174019B (en) | 1985-04-19 | 1985-04-19 | Improvements in froth flotation |
| ZA862813A ZA862813B (en) | 1985-04-19 | 1986-04-15 | Froth flotation |
| AU56198/86A AU5619886A (en) | 1985-04-19 | 1986-04-16 | Froth flotation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08510084A GB2174019B (en) | 1985-04-19 | 1985-04-19 | Improvements in froth flotation |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8510084D0 GB8510084D0 (en) | 1985-05-30 |
| GB2174019A true GB2174019A (en) | 1986-10-29 |
| GB2174019B GB2174019B (en) | 1988-02-03 |
Family
ID=10577929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08510084A Expired GB2174019B (en) | 1985-04-19 | 1985-04-19 | Improvements in froth flotation |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5619886A (en) |
| GB (1) | GB2174019B (en) |
| ZA (1) | ZA862813B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4826588A (en) * | 1988-04-28 | 1989-05-02 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| US4830740A (en) * | 1988-04-19 | 1989-05-16 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| ES2036465A1 (en) * | 1990-08-10 | 1993-05-16 | Kali & Salz Ag | Rock salt from ocean deposits |
-
1985
- 1985-04-19 GB GB08510084A patent/GB2174019B/en not_active Expired
-
1986
- 1986-04-15 ZA ZA862813A patent/ZA862813B/en unknown
- 1986-04-16 AU AU56198/86A patent/AU5619886A/en not_active Abandoned
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4830740A (en) * | 1988-04-19 | 1989-05-16 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| EP0338778A2 (en) * | 1988-04-19 | 1989-10-25 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| EP0338778A3 (en) * | 1988-04-19 | 1991-01-16 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| US4826588A (en) * | 1988-04-28 | 1989-05-02 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| EP0339856A2 (en) * | 1988-04-28 | 1989-11-02 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| EP0339856A3 (en) * | 1988-04-28 | 1991-01-16 | The Dow Chemical Company | Pyrite depressants useful in the separation of pyrite from coal |
| AU610727B2 (en) * | 1988-04-28 | 1991-05-23 | Dow Chemical Company, The | Pyrite depressants useful in the separation of pyrite from coal |
| ES2036465A1 (en) * | 1990-08-10 | 1993-05-16 | Kali & Salz Ag | Rock salt from ocean deposits |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8510084D0 (en) | 1985-05-30 |
| ZA862813B (en) | 1986-12-30 |
| GB2174019B (en) | 1988-02-03 |
| AU5619886A (en) | 1986-10-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |