AU727233B1 - Process for the production of reduced ilmenite - Google Patents
Process for the production of reduced ilmenite Download PDFInfo
- Publication number
- AU727233B1 AU727233B1 AU65381/99A AU6538199A AU727233B1 AU 727233 B1 AU727233 B1 AU 727233B1 AU 65381/99 A AU65381/99 A AU 65381/99A AU 6538199 A AU6538199 A AU 6538199A AU 727233 B1 AU727233 B1 AU 727233B1
- Authority
- AU
- Australia
- Prior art keywords
- ilmenite
- stage
- temperatures
- charring
- raw
- 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.)
- Ceased
Links
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 title claims description 34
- 238000000034 method Methods 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000007789 gas Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 12
- 239000003245 coal Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 5
- 235000009917 Crataegus X brevipes Nutrition 0.000 claims 1
- 235000013204 Crataegus X haemacarpa Nutrition 0.000 claims 1
- 235000009685 Crataegus X maligna Nutrition 0.000 claims 1
- 235000009444 Crataegus X rubrocarnea Nutrition 0.000 claims 1
- 235000009486 Crataegus bullatus Nutrition 0.000 claims 1
- 235000017181 Crataegus chrysocarpa Nutrition 0.000 claims 1
- 235000009682 Crataegus limnophila Nutrition 0.000 claims 1
- 235000004423 Crataegus monogyna Nutrition 0.000 claims 1
- 240000000171 Crataegus monogyna Species 0.000 claims 1
- 235000002313 Crataegus paludosa Nutrition 0.000 claims 1
- 235000009840 Crataegus x incaedua Nutrition 0.000 claims 1
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
PROCESS FOR THE PRODUCTION OF REDUCED ILMENITE The invention relates to a process for producing reduced ilmenite from raw and solid, grainy fuel in a reduction kiln.
A process of this kind is known from the US patent 5403379 where the reduction is performed in a rotary kiln adding coal to the kiln. The US patent also describes how reduced ilmenite is processed to synthetic rutile (TiO 2 According to the invention, there is provided a process for the production of reduced ilmenite from raw ilmenite and solid, grainy fuel in a reduction kiln at temperatures in a range from 1000 to 14000C, wherein the coal being charred in a charring stage at temperatures from 550 to 9000C in the presence of oxygenbearing gas generating char which is fed into the reduction kiln, mixture of hydrocarbon-containing gases and vapours being drawn off the charring stage, raw ilmenite being fed to a preheating stage into which at least part of the mixture of gases and vapours and oxygen-containing gas are also fed and the raw ilmenite is preheated to temperatures between 500 and 11000C, and preheated ilmenite being fed into the reduction kiln.
According to the invention, there is also provided a process for the production of reduced ilmenite, the process including: charring coal in a charring stage at temperatures from 550 to 9000C in the presence of oxygen-bearing gas to generate char; feeding the char into the reduction kiln; drawing off a mixture of hydrocarbon-containing gases and vapours from the charring stage; feeding raw ilmenite to a preheating stage; feeding at least part of said mixture of gases and vapours into said preheating stage; preheating the raw ilmenite in said preheating -stage to temperatures between 500 and 1100C; and feeding the preheated ilmenite into the reduction kiln.
According to exemplary embodiments of the invention, char is added to the reduction kiln beside the preheated ilmenite. Typically, the share of the char in the reducing agent fed to the reduction kiln may be around 80 to 100 percent by
RA
weight and preferably at least 90 %wt. In this way, the energy which is normally needed to remove the volatile components from the coal in the known processes is omitted. The hydrocarbon-containing gases and vapours generated in the charring zone outside of the reduction kiln may have relatively high calorific values and are combusted to preheat the raw ilmenite in the preheating stage.
The gases and vapours are thus used in a very advantageous way. Since the raw ilmenite is transferred to the reduction kiln after being preheated to high temperatures, the kiln can be operated at higher throughputs.
An advantage of an exemplary embodiment of the invention is maximum cost-effectiveness and minimized kiln size. At the same time, existing reduction plants are to be allowed to run with higher throughputs.
In order that the invention might be more fully understood, an embodiment of the invention will be described by way of example only with reference to the accompanying drawing which shows a flow diagram of an embodiment of the process.
Referring to the drawing, the raw ilmenite is taken in through line and fed for preheating to a fluidised bed reactor as part of a circulating fluidised bed system. Air, which can be preheated, enters the bottom part of the reactor through line Additionally hydrocarbon-containing gases and Li> 3
K
3 vapours enter through line and are used as fuel. This mixture of gases and vapours is combusted in the reactor (2) in the presence of raw ilmenite with a certain oxygen surplus.
The level of oxygen surplus depends in general on the type of raw ilmenite, an intensified oxidation being of advantage in this step. A gas/solid mixture is routed from the upper part of the reactor through the channel to a separating cyclone from which the solids are returned to the lower part of the reactor through line Hot offgas is drawn off through line flows through one or several coolers first and then to a gas cleaning unit (11) before being let off into the stack (12).
In the fluidised bed reactor the raw ilmenice is heated to temperatures between 500 and 1100 0 C. The ilmenite preheated this way is removed through line (15) and routed to the reduction kiln Through line char is also fed to this kiln and serves as fuel and reducing agent. This char originates from a charring stage embodied as fluidised bed Coal containing volatile components is routed through line fluidising air, which may also be preheated, through line (20) to the fluidised bed. Partial oxid-ation generates the necessary energy in the fluidised bed, while the coal is charred at temperatures between 550 and 900aC and preferably 600 and 700"C. The mixture of hydrocarboncontaining gases and vapours thus obtained is drawn off through line transferred through a cyclone (22) to remove the solids, the gas and vapour mix being fed to the fluidised bed reactor through line Separated solids are returned to the fluidised bed through line (23).
-4 It is convenient to utilise part of the offgas heat to preheat the fluidising air of lines and For the sake of clarity, this option is not shown in the c/dr '.vg.
Offgas from the reduction kiln.(16), which may be a rotary kiln, for example, can be added to the offgas in line (9) through a route not shown and be processed together with the offgas in line(9). Reduced ilmenite is drawn off the kiln (16) through line (24) and cooled in known manner. We know from US patent 5403379, for example,.
ilmenite is further processed to synthetic rutile.
Example: In the plant shown in the drawing raw ilmenite is processed being added at a flow rate of 50 t/h through line The fluidised bed reactor (18) with a diameter of 3.3 m, receives 16.7 t/h grainy coal and 3 t/h returned char. The dry components of the coal are 63.0 %wt C (fixed)' 28.4 %wt volatile components and 7.8 %wt ash; the water content of the coal is 12.5 %wt.
The quantities and temperatures in the various lines are as follows: 5 The solids mixture drawn off the rotary kiln through line (24) has a temperature of 1150 0 C and consists of 85 %wt. reduced ilmenite and 15 %wt. char which is removed and partly returned to the fluidised bed reactor (18).
Claims (6)
1. A process for the production of reduced ilmenite from raw ilmenite and solid, grainy fuel in a reduction kiln at temperatures in a range from 1000 to 14000C, wherein the coal being charred in a charring stage at temperatures from 550 to 9000C in the presence of oxygen-bearing gas generating char which is fed into the reduction kiln, mixture of hydrocarbon-containing gases and vapours being drawn off the charring stage, raw ilmenite being fed to a preheating stage into which at least part of the mixture of gases and vapours and oxygen- containing gas are also fed and the raw ilmenite is preheated to temperatures between 500 and 11000C, and preheated ilmenite being fed into the reduction kiln.
2. A process for the production of reduced ilmenite, the process including: charring coal in a charring stage at temperatures from 550 to 9000C in the presence of oxygen-bearing gas to generate char; feeding the char into the reduction kiln; drawing off a mixture of hydrocarbon-containing gases and vapours from the charring stage; feeding raw ilmenite to a preheating stage; feeding at least part of said mixture of gases and vapours into said preheating stage; preheating the raw ilmenite in said preheating stage to temperatures between 500 and 1100C; and feeding the preheated ilmenite into the reduction kiln.
3. A process as claimed in either claim 1 or 2, wherein a rotary kiln is used as the reduction kiln.
4. A process as claimed in either claim 1 or 2, wherein the charring stage is embodied as a fluidised bed.
A process as claimed in either claim 1 or 2, wherein the preheating zone is embodied as a circulating fluidised bed.
6. A process for the production of reduced ilmenite substantially as hereinbefore described and illustrated with reference to the accompanying drawing. DATED this 3rd day of October 2000 METALLGESELLSCHAFT AKTIENGESELLSCHAFT WATERMARK PATENT TRADEMARK ATTORNEYS 290 BURWOOD ROAD HAWTHORN VICTORIA 3122 AUSTRALIA SKP/RJS/MEH P16927AU00.DOC o w C) -I U1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU65381/99A AU727233B1 (en) | 1999-12-21 | 1999-12-21 | Process for the production of reduced ilmenite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU65381/99A AU727233B1 (en) | 1999-12-21 | 1999-12-21 | Process for the production of reduced ilmenite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU727233B1 true AU727233B1 (en) | 2000-12-07 |
Family
ID=3749996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU65381/99A Ceased AU727233B1 (en) | 1999-12-21 | 1999-12-21 | Process for the production of reduced ilmenite |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU727233B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111733336A (en) * | 2020-08-28 | 2020-10-02 | 湖南碳谷装备制造有限公司 | Preparation process and system for producing high-grade titanium-rich material by utilizing ilmenite |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3859593A (en) * | 1992-05-15 | 1993-11-18 | Iluka Midwest Limited | An improvement to the reduction of titaniferous ores |
| AU6600994A (en) * | 1993-06-25 | 1995-01-05 | Almeth Pty Limited | Primary beneficiation of ilmenite |
| AU7533796A (en) * | 1995-12-22 | 1997-06-26 | Iluka Resources Limited | Improved method of reagent incorporation during thermal treatment of titaniferous ores |
-
1999
- 1999-12-21 AU AU65381/99A patent/AU727233B1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3859593A (en) * | 1992-05-15 | 1993-11-18 | Iluka Midwest Limited | An improvement to the reduction of titaniferous ores |
| AU6600994A (en) * | 1993-06-25 | 1995-01-05 | Almeth Pty Limited | Primary beneficiation of ilmenite |
| AU7533796A (en) * | 1995-12-22 | 1997-06-26 | Iluka Resources Limited | Improved method of reagent incorporation during thermal treatment of titaniferous ores |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111733336A (en) * | 2020-08-28 | 2020-10-02 | 湖南碳谷装备制造有限公司 | Preparation process and system for producing high-grade titanium-rich material by utilizing ilmenite |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) | ||
| PC | Assignment registered |
Owner name: OUTOKUMPU OYJ Free format text: FORMER OWNER WAS: METALLGESELLSCHAFT AKTIENGESELLSCHAFT |
|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |