EP0751821A1 - A process for producing agglomerates - Google Patents
A process for producing agglomeratesInfo
- Publication number
- EP0751821A1 EP0751821A1 EP95912963A EP95912963A EP0751821A1 EP 0751821 A1 EP0751821 A1 EP 0751821A1 EP 95912963 A EP95912963 A EP 95912963A EP 95912963 A EP95912963 A EP 95912963A EP 0751821 A1 EP0751821 A1 EP 0751821A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- agglomerates
- process defined
- mineral
- fluidised bed
- particle size
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
- C22B1/10—Roasting processes in fluidised form
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
Definitions
- the present invention relates to a process for producing agglomerates of a feed material for a fluidised bed roaster or a fluidised bed combustion furnace.
- particles of the mineral concentrate feed that are above an upper limit of the preferred particle size distribution tend to remain in the bed and may lead to defluidisation of the bed.
- the preferred particle size distribution for fluidised bed roasters varies with the type of fluidised bed roaster.
- 0.1 to 2mm is the preferred particle size distribution for a known type of Lurgi fluidised bed roaster which operates with superficial gas velocities in the bed of approximately 0.67 m/sec at a temperature of 975°C and approximately 0.4 m/sec in the freeboards.
- the preparation of a mineral concentrate feed for fluid bed roasting is normally done by a process of grinding and froth flotation of an ore containing the mineral.
- froth flotation invariably results in the mineral concentrate being produced as a slurry and, in this form, the mineral concentrate cannot be transported by shipping or handled or stored using conventional solid handling systems, and the mineral concentrate is not a suitable feed for a Lurgi-type fluidised bed roaster.
- dewatering and agglomeration of a mineral concentrate are necessary to produce a mineral concentrate in a form that can be readily handled, transported, and stored, and subsequently calcined under optimum operating conditions for a fluidised bed roaster.
- An object of the present invention is to provide an improved process for producing agglomerates of a mineral concentrate, particularly a finely-ground mineral concentrate.
- the agglomerates be suitable for use as a feed material for a fluidised bed roaster or a fluidised bed combustion furnace.
- the process may include the addition of water to the agglomerates.
- the compaction step (b) forms agglomerates that are relatively dense with a sufficient "green” strength to enable handling, transportation, and storage without significant breakdown of the agglomerates.
- relatively dense is understood herein to mean that the agglomerates be sufficiently compact to withstand handling without degradation to an unsatisfactory size range.
- the compaction step (b) forms relatively dense agglomerates and/or that the moisture content of the agglomerates be selected so that, when the agglomerates are fed into a fluidised bed roaster or a fluidised bed combustion furnace and are subjected to elevated temperatures, the agglomerates break down into smaller-sized agglomerates that can be processed more efficiently in the fluidised bed roaster or the fluidised combustion furnace.
- the present invention is based on the realisation that:
- step (i) by appropriate selection of the particle size of the input feed and the compaction of the input feed in step (b) , it is possible to form agglomerates having a preferred pore size;
- the agglomerates when the agglomerates are fed into a fluidised bed roaster or a fluidised bed combustion furnace and are subjected to elevated temperatures, the agglomerates break down into smaller-sized agglomerates that can be processed more efficiently in the fluidised bed roaster or the fluidised combustion furnace.
- the feed material may be any material.
- the feed material may be an organic material, such as coal washery slimes.
- the feed material may also be an inorganic material, such as a mineral or a mineral concentrate.
- the feed material be a zinc sulphide concentrate for calcining in a fluidised bed roaster.
- the input feed for step (a) comprises an ore containing the mineral.
- the process further comprises an additional step of treating the ground mineral-containing ore to separate the mineral from other components of the ore and to form a slurry of the mineral.
- the particle size distribution of the ground mineral-containing ore produced in step (a) be 100% less than 100 micron.
- the particle size of the ground mineral-containing ore produced in step (a) be less than 40 micron.
- the particle size of the ground mineral-containing ore produced in step (a) comprises at least 50% of the particles being less than 10 micron.
- the particle size of the ground mineral-containing ore produced in step (a) comprises at least 10% of the particles being less than 2 micron.
- the size of the agglomerates produced in step (b) be 1 to 25mm.
- size of the agglomerates produced in step (b) be 4.5 to 15 mm.
- the moisture content of the agglomerates produced in step (b) be less than 15% at the time the agglomerates are fed to a fluidised bed roaster or a fluidised bed combustion furnace.
- the moisture content of the agglomerates produced in step (b) be less than 13% at the time the agglomerates are fed to a fluidised bed roaster or a fluidised bed combustion furnace.
- the moisture content of the agglomerates produced in step (b) be greater than 1% at the time the agglomerates are fed to a fluidised bed roaster or a fluidised bed combustion furnace.
- the moisture content of the agglomerates produced in step (b) be greater than 5% at the time the agglomerates are fed to a fluidised bed roaster or a fluidised bed combustion furnace.
- the compaction step (b) be carried out in a high pressure filtration apparatus.
- a process for calcining a mineral concentrate comprising, feeding agglomerates of the mineral concentrate formed by the process described in the preceding paragraphs into a fluidised bed roaster or a fluidised bed combustion furnace, and calcining the agglomerates therein.
- the figure is a graph which illustrates the particle size distribution of calcine produced from zinc sulphide concentrate in fluidised bed reactors from agglomerates formed by a range of different compaction processes, as summarised below.
- Denver tube press to form ' agglomerates having a moisture content of 12% and a particle size distribution of 9.5 to 10 16mm;
- the grain size distribution of the unagglomerated concentrate used to produce the samples was as follows:
- the samples were calcined in either a 300mm diameter pilot plant fluidised bed roaster or a 70mm diameter bench scale fluidised bed roaster.
- the fluidised bed roasters were found by the applicants to have similar fluidising conditions to the commercial Lurgi-type fluidised bed roasters discussed above and thus the results of the experimental work are indicative of the results that would be achieved in those Lurgi-type fluidised bed roasters.
- the particle size distribution for samples b, c, and d and, to a lesser extent, sample e are within the preferred particle size distribution of 0.1 to 2mm for optimum operation of a Lurgi-type fluidised bed roaster.
- sample b is particularly significant, and unexpected, because the particle size distribution of the input feed of agglomerates was in the range of 9.5 to 16mm, which is considerably larger than the upper limit of the preferred prior art particle size distribution for Lurgi-type fluidised bed roasters, and it was expected that, under normal circumstances, such large- sized agglomerates would not be fluidised and hence render the roasters inoperable.
- sample e was prepared in view of concern that agglomerates of zinc sulphide concentrate may break-down into fines during transportation from an ore resource to a commercial fluidised bed roaster.
- the result for sample e shows that re-agglomeration of shredded agglomerates produced agglomerates that had a satisfactory particle size distribution when calcined in a fluidised bed roaster.
- sample b ii also illustrates the effect of moisture content on the agglomerates. Specifically, as is noted above, sample b ii was formed by re-wetting the dried agglomerate which had been used to produce sample a and thereafter re-forming this agglomerate to a moisture content of 12%. The results for sample b ii were the same as for sample b i and indicate that agglomerates can be re-wetted without loss of performance should the agglomerates be over-dried.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPM4609A AUPM460994A0 (en) | 1994-03-21 | 1994-03-21 | A process for producing agglomerates |
AUPM4609/94 | 1994-03-21 | ||
PCT/AU1995/000156 WO1995025585A1 (en) | 1994-03-21 | 1995-03-21 | A process for producing agglomerates |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0751821A1 true EP0751821A1 (en) | 1997-01-08 |
EP0751821A4 EP0751821A4 (en) | 1998-01-28 |
Family
ID=3779224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95912963A Withdrawn EP0751821A4 (en) | 1994-03-21 | 1995-03-21 | A process for producing agglomerates |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0751821A4 (en) |
JP (1) | JPH10500353A (en) |
AU (1) | AUPM460994A0 (en) |
CA (1) | CA2186132A1 (en) |
FI (1) | FI963770A (en) |
NO (1) | NO964000L (en) |
TW (1) | TW350791B (en) |
WO (1) | WO1995025585A1 (en) |
ZA (1) | ZA952315B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5803949A (en) * | 1996-04-29 | 1998-09-08 | Cominco Ltd. | Fluidized bed roasting process |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1807714C2 (en) * | 1968-11-08 | 1971-01-04 | Degussa | Process and device for continuous pre-compression and simultaneous shaping of finely divided materials |
NL164212C (en) * | 1969-09-11 | 1980-12-15 | Unie Van Kunstmestfab Bv | METHOD FOR GRANULATING POWDER SUBSTANCES |
JPS5323797B1 (en) * | 1971-06-30 | 1978-07-17 | ||
DE2730941C2 (en) * | 1977-07-08 | 1986-08-28 | Gebrüder Lödige, Maschinenbaugesellschaft mbH, 4790 Paderborn | Device for granulating powdery, fibrous, pasty or mushy material and for drying the granules obtained |
GR79340B (en) * | 1982-07-06 | 1984-10-22 | Sterwin Ag | |
DE3734760C3 (en) * | 1987-10-14 | 1996-03-21 | Kloeckner Humboldt Deutz Ag | Process and plant for compacting fine-grained material with pelleting |
-
1994
- 1994-03-21 AU AUPM4609A patent/AUPM460994A0/en not_active Abandoned
-
1995
- 1995-03-21 CA CA002186132A patent/CA2186132A1/en not_active Abandoned
- 1995-03-21 EP EP95912963A patent/EP0751821A4/en not_active Withdrawn
- 1995-03-21 WO PCT/AU1995/000156 patent/WO1995025585A1/en not_active Application Discontinuation
- 1995-03-21 JP JP7524253A patent/JPH10500353A/en active Pending
- 1995-03-22 ZA ZA952315A patent/ZA952315B/en unknown
- 1995-08-31 TW TW084109122A patent/TW350791B/en active
-
1996
- 1996-09-23 NO NO964000A patent/NO964000L/en unknown
- 1996-09-23 FI FI963770A patent/FI963770A/en unknown
Non-Patent Citations (2)
Title |
---|
No further relevant documents disclosed * |
See also references of WO9525585A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH10500353A (en) | 1998-01-13 |
TW350791B (en) | 1999-01-21 |
MX9604214A (en) | 1998-05-31 |
AUPM460994A0 (en) | 1994-04-14 |
WO1995025585A1 (en) | 1995-09-28 |
FI963770A0 (en) | 1996-09-23 |
NO964000D0 (en) | 1996-09-23 |
CA2186132A1 (en) | 1995-03-21 |
EP0751821A4 (en) | 1998-01-28 |
NO964000L (en) | 1996-11-20 |
ZA952315B (en) | 1995-12-14 |
FI963770A (en) | 1996-11-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8517293B2 (en) | Waterless separation systems for coal and minerals | |
US9228246B2 (en) | Method of agglomerating silicon/silicon carbide from wiresawing waste | |
GB1574194A (en) | Process for producing selenium powder from crude selenium | |
CA2476579A1 (en) | Method and apparatus for grinding iron ore or iron ore concentrate | |
US4416688A (en) | Direct reduction of ores and concentration of metallic values | |
CA1112045A (en) | Solid coal from agglomeration of aqueous slurry with a binder | |
AU704350B2 (en) | A process for producing agglomerates | |
WO1995025585A1 (en) | A process for producing agglomerates | |
US3948638A (en) | Method for the press granulation of industrial dusts separated in dust removal systems | |
US4830637A (en) | Preagglomeration of fine coal before thermal dryer in a preparation plant | |
US3773473A (en) | Beneficiation and hot briquetting of phosphate ores by removing -400 mesh fines | |
CA1110204A (en) | Apparatus for producing slurry | |
JP4563472B2 (en) | Manufacturing method of thin glass raw material | |
US3420453A (en) | Damp grinding for agglomeration | |
KR102282267B1 (en) | Process and apparatus for roasting metal sulfide concentrates and/or residues | |
MXPA96004214A (en) | Process for the production of aglomera | |
US3254985A (en) | Pelletizing relatively coarse iron minerals | |
US3168254A (en) | Method for preparing the fuel component of agglomerator-feed mix | |
AU5682600A (en) | Method for the preparation of fine grain ores | |
EP0274187A2 (en) | Improvements in or relating to the fluidised-bed roasting of sulphide minerals | |
KR20010020393A (en) | Method for thermal treatment of granulated iron ore before reduction | |
GB2183506A (en) | Process for improving dry methods of black stone coal separation | |
JPS6187827A (en) | Method and device for treatment of converter dust | |
CA1156535A (en) | Hydroxylbenzyl amines as dewatering agents | |
USH981H (en) | Process for selective grinding of coal |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19961018 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE ES FR IT NL SE |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 19971216 |
|
AK | Designated contracting states |
Kind code of ref document: A4 Designated state(s): BE DE ES FR IT NL SE |
|
17Q | First examination report despatched |
Effective date: 19990804 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20011127 |