EP0267170B1 - Behandlung von Zwischengut - Google Patents
Behandlung von Zwischengut Download PDFInfo
- Publication number
- EP0267170B1 EP0267170B1 EP87850297A EP87850297A EP0267170B1 EP 0267170 B1 EP0267170 B1 EP 0267170B1 EP 87850297 A EP87850297 A EP 87850297A EP 87850297 A EP87850297 A EP 87850297A EP 0267170 B1 EP0267170 B1 EP 0267170B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- middlings
- grinding
- dressing
- reground
- regrinding
- 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
Links
- 238000000034 method Methods 0.000 claims abstract description 28
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 18
- 239000011707 mineral Substances 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 14
- 238000005188 flotation Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000007885 magnetic separation Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000010450 olivine Substances 0.000 claims description 2
- 229910052609 olivine Inorganic materials 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000006148 magnetic separator Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/20—Disintegrating members
-
- 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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
-
- 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
Definitions
- the present invention relates to concentrating or dressing processes within the mineral processing technique, and relates more particularly to a method for use when dressing a mineral product, particularly when dressing iron ore and sulphide ore, which product has been finely divided to a particle size suitable for dressing treatment thereof in at least two stages by flotation or by magnetic separation, wherein middlings obtained during the dressing treatment are reground in order to crush individual half-grains and therewith release valuable mineral therefrom, and wherein the reground middlings are then again subjected to dressing treatment.
- middlings rich in valuable mineral e.g. the waste or tailings deriving from a cleaner of a flotation process or from a secondary magnetic separator
- the middlings may be passed to the ball mill, where they are reground, but it has also been proposed to regrind the middlings in a separate tube mill.
- the object of the present invention is to provide a novel and useful method of procedure which will at least substantially avoid the aforesaid drawbacks encountered with known middlings- regrinding processes.
- This regrinding method effected with the aid of comparatively small grinding bodies, results with only a relatively low energy input, in an effective attrition effect which is directed essentially to the coarse fraction of the middlings, so as to obtain a reground product which can be beneficially returned to the dressing process and which exhibits an optimum, steep particle-distribution curve.
- This regrinding is effected to advantage with an energy input of at most 15 kWh/t of dry middlings, there being normally obtained herewith the desired steep particle-size distribution with desired degradation of the so-called half-grains, i.e. mineral particles which contain both valuable mineral and gangue, without at the same time forming excessive quantities of such fines which are liable to generate not-readily processed sludge or dust in the dressing equipment.
- half-grains i.e. mineral particles which contain both valuable mineral and gangue
- the grinding bodies used when practicing the method according to the present invention may consist of a metallic or a ceramic material, although it is normally preferred to use as grinding medium grinding bodies composed of autogenous material, e.g. a fraction selected from the material to be dressed, or a material which is rich in silicon, such as quartz or olivine. Grinding bodies which are comprised of these preferred materials are much cheaper than prefabricated metallic or ceramic grinding bodies, and result in grinding-medium residues in the reground middlings which are normally quite innocuous to the dressing process, while material which is worn away from, e.g., grinding bodies of steel, on the other hand, may cause metallic coatings to form on mineral grains, therewith rendering the concentration by flotation difficult. Problems caused by the entrainment of grinding-medium residues with the reground material, however, can normally be overcome by subjecting the reground middlings to a separate treatment to remove undesirable grinding-medium residues.
- the middlings can be reground either in a dry or in a wet environment.
- a dressing process which is carried out in a wet environment, such as a flotation concentration process
- an advantage is gained when the middlings are also reground in a wet environment, thereby obviating the need of expensive de-watering treatment.
- References 1 and 2 in the drawing designate respectively a primary mill and a secondary mill, which in the illustrated embodiment are assumed to have the form of a rod mill 1, which receives a crushed mineral product to be dressed or concentrated, and a ball mill 2 for continued grinding of the product arriving from the rod mill 1.
- the product leaving the ball mill 2 is divided in a classifier 3 into a relatively fine-grained fraction, suitable for concentration, and a coarser fraction, which is returned to the ball mill for further reduction in size, in the manner indicated by the line 4.
- the aforesaid fine-grain fraction is passed to a concentration plant, which in the case of the illustrated embodiment is assumed to be a flotation plant that incorporates a rougher 5 and a cleaner 6.
- the fine-grain fraction is supplied in a substantially continual stream to the rougher 5, where the material is subjected to flotation with a suitable reagent, to form a waste or tailings containing only a low proportion of the valuable mineral or minerals concerned, these tailings being removed from the process in the manner indicated by the arrow 7.
- the rougher concentrate obtained in the rougher 5 is passed to the cleaner 6, in the manner indicated by the arrow 8, where there is formed, in a conventional manner, a final concentrate which contains a high proportion of valuable mineral and which is removed from the process in the manner indicated by the arrow 9, and a return product or middlings having a relatively high content of valuable mineral.
- middlings are passed, in the manner indicated by the arrow 10, to a mill 11 which incorporates an agitated grinding medium, by which is meant in this patent application a mill in which a grinding effect is achieved with the aid of grinding bodies and in which the middlings that are being ground are agitated by means of an agitator that moves at a high speed. Grinding is thus accomplished as a result of pressure and shear forces which act between the grinding bodies and the middlings, these forces being generated by the agitator, which is constructed so as normally to rotate at a speed of several hundred revolutions per minute and to deliver a high power output per unit of mill volume, normally in the order of at least 10 times the power consumption per unit of mill volume of a conventional ball mill.
- the drawing shows the mill 11 provided with a rotor 12 having radially extending rotor blades 13 and stator blades 14 extending radially into the grinding chamber from the surrounding mill casing.
- the grinding bodies in the mill 11 comprise a material which is undesirable in the reground middlings
- those fractions of this material which accompany the reground middlings discharged from the mill 11 may be separated out in an optional separation step 15.
- Grinding in the mill 11 is preferably effected in a wet environment.
- the reground product is returned to a suitable location in the rougher 5, for renewed flotation therein, as indicated by the arrow 16.
- the material being dressed may, e.g., be a sulphide ore which is concentrated by separating therefrom gangue or oxidic iron ore which is concentrated by separating phosphorous constituents therefrom.
- the rougher 5 and the cleaner 6 may be replaced with magnetic separators mutually connected in series.
- the grinding medium may comprise grinding bodies, e.g. balls or rods, made of sintered hard metal, such as sintered tungsten carbide.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Coloring Foods And Improving Nutritive Qualities (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87850297T ATE60527T1 (de) | 1986-10-06 | 1987-10-02 | Behandlung von zwischengut. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8604241A SE8604241D0 (sv) | 1986-10-06 | 1986-10-06 | Returmaterialbehandling |
SE8604241 | 1986-10-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0267170A1 EP0267170A1 (de) | 1988-05-11 |
EP0267170B1 true EP0267170B1 (de) | 1991-01-30 |
Family
ID=20365837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87850297A Expired EP0267170B1 (de) | 1986-10-06 | 1987-10-02 | Behandlung von Zwischengut |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0267170B1 (de) |
AT (1) | ATE60527T1 (de) |
DE (1) | DE3767832D1 (de) |
ES (1) | ES2021395B3 (de) |
SE (1) | SE8604241D0 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1230847B (it) * | 1989-05-22 | 1991-11-08 | Rodio & C Const G | Procedimento e impianto per la produzione di miscele cementizie iniettabili. |
SE9000797L (sv) * | 1990-03-07 | 1991-09-08 | Sala International Ab | Anordning foer malning av mineralprodukter |
SE469417B (sv) * | 1991-12-20 | 1993-07-05 | Sala International Ab | Saett och anordning foer finmalning av foer filleraendamaal anvaendbara mineral i torrt tillstaand |
SE502566C2 (sv) * | 1992-12-04 | 1995-11-13 | Cementa Ab | Sätt för vidaremalning av cement |
ATE158202T1 (de) * | 1992-07-07 | 1997-10-15 | Ecc Int Ltd | Differentialzerkleinerung |
CN106179718A (zh) * | 2016-08-02 | 2016-12-07 | 山东华联矿业股份有限公司 | 中矿选别工艺 |
CN107812590B (zh) * | 2016-09-14 | 2020-01-03 | 中国地质科学院矿产综合利用研究所 | 一种细粒难选矿的选择性解离强化分选方法 |
CN108704761A (zh) * | 2018-04-24 | 2018-10-26 | 赣州金环磁选设备有限公司 | 一种利用海滨石英砂制备板材石英的方法 |
CN110976069A (zh) * | 2020-01-10 | 2020-04-10 | 中建材蚌埠玻璃工业设计研究院有限公司 | 一种深层海相沉积型石英砂的无害化提纯方法 |
CN116375044B (zh) * | 2023-04-10 | 2024-09-20 | 西南科技大学 | 一种高纯石英及其制备方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2441584A (en) * | 1942-06-20 | 1948-05-18 | Harry L Mcneill | Closed circuit grinding with twostage classification |
US3167502A (en) * | 1962-03-20 | 1965-01-26 | Minerals & Chem Philipp Corp | Process for recovering cassiterite from ores |
DE1261094B (de) * | 1967-07-28 | 1968-02-15 | Siteg Siebtech Gmbh | Verfahren und Vorrichtung zur Aufbereitung mittels Flotation |
SE410561B (sv) * | 1973-04-13 | 1979-10-22 | Boliden Ab | Anleggning for autogen eller semiautogen malning av styckeformigt material, serskilt malm |
SE382920B (sv) * | 1973-08-09 | 1976-02-23 | Platmanufaktur Ab | Anordning for separering av forsorterat fast hushallsavfall |
DE2827924B2 (de) * | 1977-10-13 | 1981-05-21 | Simmering-Graz-Pauker AG für Maschinen-, Kessel- und Waggonbau, Wien | Verfahren zur Aufbereitung flotierbarer Mineralien und Erze |
-
1986
- 1986-10-06 SE SE8604241A patent/SE8604241D0/xx unknown
-
1987
- 1987-10-02 EP EP87850297A patent/EP0267170B1/de not_active Expired
- 1987-10-02 DE DE8787850297T patent/DE3767832D1/de not_active Expired - Lifetime
- 1987-10-02 ES ES87850297T patent/ES2021395B3/es not_active Expired - Lifetime
- 1987-10-02 AT AT87850297T patent/ATE60527T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE60527T1 (de) | 1991-02-15 |
ES2021395B3 (de) | 1991-11-01 |
SE8604241D0 (sv) | 1986-10-06 |
EP0267170A1 (de) | 1988-05-11 |
DE3767832D1 (de) | 1991-03-07 |
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