CN106222351A - A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction - Google Patents
A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction Download PDFInfo
- Publication number
- CN106222351A CN106222351A CN201610606055.6A CN201610606055A CN106222351A CN 106222351 A CN106222351 A CN 106222351A CN 201610606055 A CN201610606055 A CN 201610606055A CN 106222351 A CN106222351 A CN 106222351A
- Authority
- CN
- China
- Prior art keywords
- pelletizing
- reduction
- rotary hearth
- hearth furnace
- balls
- 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.)
- Pending
Links
- 238000005453 pelletization Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000654 additive Substances 0.000 claims abstract description 26
- 230000000996 additive effect Effects 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000008188 pellet Substances 0.000 claims abstract description 13
- 239000012141 concentrate Substances 0.000 claims abstract description 11
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 238000011946 reduction process Methods 0.000 claims abstract description 10
- 238000009628 steelmaking Methods 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 239000004484 Briquette Substances 0.000 claims abstract description 4
- 239000004411 aluminium Substances 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 7
- 238000001465 metallisation Methods 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000003245 coal Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a kind of method that rotary hearth furnace multilamellar pelletizing synchronizes reduction, belong to non-blast furnace ironmaking technical field.V-ti magnetite concentrate is mixed with carbonaceous reducing agent and carries out pelletizing, pressure ball or mixing briquetting, pelletizing, pressure ball or mixing briquetting are placed in rotary hearth furnace formation multilamellar layers of balls, top layers of balls does not adds additive in pelletizing, pressure ball or mixing briquetting process, adjacent layers of balls down is incremented by addition additive by pelletizing, pressure ball or the 0.01 of mixing briquette quality～30%, then carries out synchronizing reduction process and obtains being available for the reducting pellet that electric furnace steel making uses.The present invention accelerates the rate of reduction of bottom layers of balls carbonaceous pelletizing, shortens the recovery time, make the highest degree of metalization that the whole bed of material can reach under the conditions of reaching a certain specific reducing process after reduction certain time simultaneously, realize rotary hearth furnace carbonaceous pelletizing polytrope and synchronize reduction, weaken the top layer carbonaceous pelletizing secondary oxidation degree in the reduction later stage to greatest extent.
Description
Technical field
The present invention relates to a kind of method that rotary hearth furnace multilamellar pelletizing synchronizes reduction, belong to non-blast furnace ironmaking technical field.
Background technology
Rotary hearth furnace Coal-based Direct Reduction Technologies is a kind of Coal-based Direct Reduction Technologies for roasting carbon containing mineral aggregate pelletizing, its
Process characteristic is: by material containing metal oxide and solid coal dust mixed pelletizing, carbonaceous pelletizing can be equably by material distributing machine
Cloth is on furnace bottom, along with the spacious flame under the high temperature of 900～1400 DEG C that rotates of furnace bottom heats, it is achieved the fast restore of material is to obtain
Obtain reduzate.The carbonaceous pelletizing time of staying in stove can be according to the speed of its rate of reduction by controlling furnace bottom velocity of rotation
It is adjusted.Therefore rotary hearth furnace coal-based DR process have that reduction temperature is high, the time is short, furnace charge and furnace bottom geo-stationary,
The features such as flexible operation, obtain in fields such as complicated metalliferous mineral extraction, metallurgical waste comprehensive utilization and ferroalloy productions
Commonly used.
In rotary hearth furnace, energy is transferred to the bed of material from top to bottom mainly by radiant heat transfer, and heat transfer efficiency is low, can only carry out thin
The bed of material operates, generally 1 ~ 2 layer；In addition metallized pellet is in the reduction later stage inevitably by the secondary oxidation of furnace gas, causes
Make rotary hearth furnace production efficiency low, limit the large-scale application of rotary hearth furnace coal-based DR process.Therefore, thickness of feed layer is improved
It it is the important channel realizing the direct-reduction process scale extension of v-ti magnetite concentrate rotary hearth furnace.Owing to being passed by heat in rotary hearth furnace
The mode feature of passing is determined, after the bed of material number of plies increases, top layer carbonaceous pelletizing is heated at first and starts reduction.Bottom bed of material carbonaceous pelletizing
Owing to being blocked by its last layer carbonaceous pelletizing, direct heating surface area is less so that it is temperature is lower than last layer carbonaceous pelletizing and rises
Temperature speed is slow, thus rate of reduction is slow.So, along with the carrying out of reaction, at the end of top layer carbonaceous pelletizing is already close to reduction,
Bottom bed of material carbonaceous pelletizing the most fully reduces.In order to obtain high degree of metalization, need to ensure that carbonaceous pelletizing is at furnace high-temperature district foot
The enough long time, this most easily caused the secondary oxygen of upper strata carbonaceous pelletizing so that bottom bed of material carbonaceous pelletizing is fully reduced
Changing, degree of metalization reduces, and ultimately results in overall bed of material average metal rate and reduces.Therefore, it is achieved rotary hearth furnace carbonaceous pelletizing multilamellar
It is significant that ball synchronizes reduction.
Summary of the invention
The problem existed for above-mentioned prior art and deficiency, the present invention provides a kind of rotary hearth furnace multilamellar pelletizing to synchronize reduction
Method.By in Different layer of the compost carbonaceous pelletizing with addition of the different amounts of additive that can improve Reduction of Pellet Containing Coal Char speed, with
Accelerate the rate of reduction of bottom layers of balls carbonaceous pelletizing, shorten the recovery time, make the whole bed of material reach after reduction certain time simultaneously
The highest degree of metalization that can reach under the conditions of a certain specific reducing process, it is achieved rotary hearth furnace carbonaceous pelletizing polytrope synchronizes also
Former, weaken the top layer carbonaceous pelletizing secondary oxidation degree in the reduction later stage to greatest extent, the present invention is by the following technical programs
Realize.
A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that v-ti magnetite concentrate and carbonaceous
Reducing agent mixing carries out pelletizing, pressure ball or mixing briquetting, and pelletizing, pressure ball or mixing briquetting are placed in rotary hearth furnace formation polytrope
Layer, top layers of balls does not adds additive in pelletizing, pressure ball or mixing briquetting process, and adjacent layers of balls down presses pelletizing, pressure ball
Or mixing briquette quality 0.01～30% be incremented by add additive, then carry out synchronize reduction process obtain being available for electric furnace steel making
The reducting pellet used.
Described additive is aluminium powder.
Described multilamellar layers of balls >=2 layer, bed of material gross thickness >=10mm.
The invention has the beneficial effects as follows: there is raising rotary hearth furnace production efficiency, capacity usage ratio and metallized pellet gold
The advantage belonging to rate, provides beneficial pathways for rotary hearth furnace popularizationization.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 reduction result figure；
Fig. 2 is prior art reduction result figure of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, the invention will be further described.
Embodiment 1
This rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that
(1) v-ti magnetite concentrate (is included following mass percent component: TFe52.62%, FeO32%, TiO212%、
V2O50.6%) mix according to volume ratio 10:2 make with carbonaceous reducing agent (wherein fixed carbon mass percent is not less than 80%)
Ball；
(2) pelletizing is placed in rotary hearth furnace three layers of layers of balls of formation, and top layers of balls does not adds additive, the second layer in balling process
With the addition of the aluminium powder additive of pelletizing quality 1% in balling process, third layer with the addition of pelletizing quality 3% in balling process
Aluminium powder additive, then at 1350 DEG C, CO/CO in atmosphere2Volume ratio ratio is to carry out 35min under conditions of 2 to synchronize reduction
Process obtains being available for the reducting pellet that electric furnace steel making uses.
Contrast test
V-ti magnetite concentrate mixing is carried out pelletizing, pelletizing is placed in rotary hearth furnace three layers of layers of balls of formation, balling process does not adds
Enter additive aluminium powder, then at 1350 DEG C, CO/CO in atmosphere2Volume ratio ratio is to carry out 45min under conditions of 2 to synchronize also
Former process obtains being available for the reducting pellet that electric furnace steel making uses, and other Parameter Conditions are same as in Example 1.
Embodiment 1 reduction result figure as it is shown in figure 1, contrast test reduction result figure as shown in Figure 2；Embodiment 1 is in reduction
After 35min, overall bed of material average metal rate has reached 90.67%, it is achieved that synchronize reduction, and after contrast test reduction 45min
Overall bed of material average metal rate is only 87%.
Embodiment 2
This rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that
(1) v-ti magnetite concentrate (is included following mass percent component: TFe52.62%, FeO32%, TiO212%、V2O
0.6%) mix according to volume ratio 10:2 with carbonaceous reducing agent (wherein fixed carbon mass percent is not less than 80%) and carry out pelletizing；
(2) pelletizing is placed in rotary hearth furnace three layers of layers of balls of formation, and top layers of balls does not adds additive, the second layer in balling process
With the addition of the aluminium powder additive of pelletizing quality 3% in balling process, third layer with the addition of pelletizing quality 6% in balling process
Aluminium powder additive, then at 1350 DEG C, CO/CO in atmosphere2Volume ratio ratio is to carry out 32min under conditions of 2 to synchronize reduction
Process obtains being available for the reducting pellet that electric furnace steel making uses, and overall bed of material average metal rate has reached 91.51%, it is achieved that with
Step reduction.
Embodiment 3
This rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that
(1) v-ti magnetite concentrate (is included following mass percent component: TFe52.62%, FeO32%, TiO212%、
V2O50.6%) mix according to volume ratio 10:2 make with carbonaceous reducing agent (wherein fixed carbon mass percent is not less than 80%)
Ball；
(2) pelletizing is placed in rotary hearth furnace formation three layers of layers of balls, bed of material gross thickness >=10mm, top layers of balls in balling process not
Adding additive, the second layer with the addition of the aluminium powder additive of pelletizing quality 6% in balling process, and third layer is in balling process
With the addition of the aluminium powder additive of pelletizing quality 9%, then at 1350 DEG C, CO/CO in atmosphere2Under conditions of volume ratio ratio is 2
Carrying out 30min synchronization reduction process and obtain being available for the reducting pellet that electric furnace steel making uses, overall bed of material average metal rate reaches
90.96%, it is achieved that synchronize reduction.
Embodiment 4
This rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that
(1) v-ti magnetite concentrate (is included following mass percent component: TFe52.62%, FeO32%, TiO212%、
V2O50.6%) mix according to volume ratio 10:2 make with carbonaceous reducing agent (wherein fixed carbon mass percent is not less than 80%)
Ball；
(2) pelletizing is placed in rotary hearth furnace formation three layers of layers of balls, bed of material gross thickness >=10mm, top layers of balls in balling process not
Adding additive, the second layer with the addition of the aluminium powder additive of pelletizing quality 6% in balling process, and third layer is in balling process
With the addition of the aluminium powder additive of pelletizing quality 9%, then at 1350 DEG C, CO/CO in atmosphere2Under conditions of volume ratio ratio is 2
Carrying out 35min synchronization reduction process and obtain being available for the reducting pellet that electric furnace steel making uses, overall bed of material average metal rate reaches
91.24%, it is achieved that synchronize reduction.
Embodiment 5
This rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that
(1) v-ti magnetite concentrate (is included following mass percent component: TFe52.62%, FeO32%, TiO212%、
V2O50.6%) mix according to volume ratio 10:2 press with carbonaceous reducing agent (wherein fixed carbon mass percent is not less than 80%)
Ball；
(2) pressure ball is placed in rotary hearth furnace formation ten layers of layers of balls, bed of material gross thickness >=10mm, top layers of balls in balling process not
Add additive, the second layer to the tenth layer with the addition of successively in balling process pressure ball quality 0.01%, 0.05%, 0.10%,
0.15%, the aluminium powder additive of 0.20%, 0.25%, 0.3%, 0.35%, 0.4%, then at 1350 DEG C, CO/CO in atmosphere2Volume
It is to carry out 30min under conditions of 2 to synchronize reduction process and obtain being available for the reducting pellet that electric furnace steel making uses, the overall bed of material than ratio
Average metal rate has reached 88.47%, it is achieved that synchronize reduction.
Embodiment 6
This rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction, and it specifically comprises the following steps that
(1) v-ti magnetite concentrate (is included following mass percent component: TFe52.62%, FeO32%, TiO212%、
V2O50.6%) mix according to volume ratio 10:2 with carbonaceous reducing agent (wherein fixed carbon mass percent is not less than 80%)
Briquetting；
(2) mixing briquetting is placed in rotary hearth furnace ten layers of layers of balls of formation, and bed of material gross thickness >=10mm, top layers of balls is at balling process
In do not add additive, the second layer to the tenth layer with the addition of successively in balling process mixing briquette quality 20%, 21%, 22%,
23%, the aluminium powder additive of 24%, 25%, 26%, 27%, 28%, then at 1350 DEG C, CO/CO in atmosphere2Volume ratio ratio is 2
Under conditions of carry out 30min and synchronize reduction process and obtain being available for the reducting pellet that electric furnace steel making uses, overall bed of material average metal
Rate has reached 92.31%, it is achieved that synchronize reduction.
Above in association with accompanying drawing, the detailed description of the invention of the present invention is explained in detail, but the present invention is not limited to above-mentioned
Embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to before without departing from present inventive concept
Put that various changes can be made.
Claims (3)
1. the method that a rotary hearth furnace multilamellar pelletizing synchronizes reduction, it is characterised in that specifically comprise the following steps that v-ti magnetite concentrate
Mix with carbonaceous reducing agent and carry out pelletizing, pressure ball or mixing briquetting, pelletizing, pressure ball or mixing briquetting are placed in rotary hearth furnace formation
Multilamellar layers of balls, top layers of balls does not adds additive in pelletizing, pressure ball or mixing briquetting process, and adjacent layers of balls down is by making
Ball, pressure ball or the 0.01 of mixing briquette quality～30% are incremented by addition additive, then carry out synchronizing reduction process and obtain powering
The reducting pellet that stove steel-making uses.
Rotary hearth furnace multilamellar pelletizing the most according to claim 1 synchronizes the method for reduction, it is characterised in that: described additive is
Aluminium powder.
Rotary hearth furnace multilamellar pelletizing the most according to claim 1 synchronizes the method for reduction, it is characterised in that: described multilamellar layers of balls
>=2 layers, bed of material gross thickness >=10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610606055.6A CN106222351A (en) | 2016-07-29 | 2016-07-29 | A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610606055.6A CN106222351A (en) | 2016-07-29 | 2016-07-29 | A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106222351A true CN106222351A (en) | 2016-12-14 |
Family
ID=57533554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610606055.6A Pending CN106222351A (en) | 2016-07-29 | 2016-07-29 | A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106222351A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904345A (en) * | 2017-11-15 | 2018-04-13 | 江苏省冶金设计院有限公司 | A kind of method for realizing the reduction of rotary hearth furnace deep bed sintering |
| CN108531677A (en) * | 2018-06-13 | 2018-09-14 | 上海宝幢新能源科技有限公司 | A kind of method and system for realizing the reduction of deep bed sintering pelletizing using rotary hearth furnace |
| CN110788113A (en) * | 2019-10-17 | 2020-02-14 | 宝武集团环境资源科技有限公司 | Method for inhibiting zinc-containing dust pellets from reduction degradation in rotary hearth furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087902A (en) * | 2015-08-04 | 2015-11-25 | 江苏省冶金设计院有限公司 | Novel pellet metallurgy method |
-
2016
- 2016-07-29 CN CN201610606055.6A patent/CN106222351A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105087902A (en) * | 2015-08-04 | 2015-11-25 | 江苏省冶金设计院有限公司 | Novel pellet metallurgy method |
Non-Patent Citations (2)
| Title |
|---|
| N.J. WELHAM: "Mechanochemical reaction between ilmenite （FeTiO3）and aluminium", 《JOURNAL OF ALLOYS AND COMPOUNDS》 * |
| 胡途: "钒钛磁铁精矿转底炉多层球还原基础研究", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107904345A (en) * | 2017-11-15 | 2018-04-13 | 江苏省冶金设计院有限公司 | A kind of method for realizing the reduction of rotary hearth furnace deep bed sintering |
| CN108531677A (en) * | 2018-06-13 | 2018-09-14 | 上海宝幢新能源科技有限公司 | A kind of method and system for realizing the reduction of deep bed sintering pelletizing using rotary hearth furnace |
| CN110788113A (en) * | 2019-10-17 | 2020-02-14 | 宝武集团环境资源科技有限公司 | Method for inhibiting zinc-containing dust pellets from reduction degradation in rotary hearth furnace |
| CN110788113B (en) * | 2019-10-17 | 2021-06-29 | 宝武集团环境资源科技有限公司 | Method for inhibiting zinc-containing dust pellets from reduction degradation in rotary hearth furnace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018094886A1 (en) | Direct reduction process of coal-based shaft furnace | |
| CN104531933B (en) | Method for producing high-quality nickel-iron alloy by reducing laterite-nickel ore under control | |
| CN104862480A (en) | Rotary hearth furnace and metal smelting method using rotary hearth furnace | |
| CN102634623B (en) | Material distributing method for carbonic mineral aggregate pellet by coal-based direct reduction process of rotary hearth furnace | |
| CN105087907B (en) | A kind of ferrochrome powder mine sintering technique | |
| CN105112663A (en) | Combined production process for high-carbon ferro-chrome and semi-coke | |
| CN106222351A (en) | A kind of rotary hearth furnace multilamellar pelletizing synchronizes the method for reduction | |
| CN111304395A (en) | Iron-making method adopting carbon thermal pre-reduction, gas-based deep reduction and synchronous cooling | |
| CN113699370A (en) | Process for producing semisteel by coal-based hydrogen metallurgy, hot agglomeration and electric furnace in iron ore concentrate rotary kiln | |
| CN104004905B (en) | A kind of blast furnace ironmaking prereduced burden production technique | |
| CN204803378U (en) | Rotary hearth furnace | |
| CN115491455A (en) | Device and method for preparing pre-reduced pellets based on belt type roasting machine | |
| CN104911343A (en) | Method for reinforcing titanium concentrate pellet prereduction | |
| CN105039628A (en) | Full-coal-based self-heat-supply direct reduction process and shaft furnace | |
| CN115491454B (en) | Iron ore microwave high-temperature sintering hydrogen-cooled reduction device and method | |
| CN102268533A (en) | Horizontally movable-fixed bed type magnetic reduction roasting process | |
| CN107354257A (en) | A kind of production method of metallic iron | |
| TWI687520B (en) | High-efficiency metal oxide carbothermal reduction method for producing metal and porous cake used thereby | |
| CN115216574B (en) | Direct reduction process and direct reduction device for iron-containing composite pellets | |
| CN104388620B (en) | A kind of method of magnetic field-intensification iron content powder carbon-burdened pellet direct-reduction | |
| CN104017928A (en) | Intermittent muffle reduction ironmaking process | |
| CN102605128A (en) | Method for producing and reducing grained iron by coke oven | |
| CN102605127A (en) | Method for reducing and producing cast iron by coke oven | |
| CN109385526B (en) | Method for reducing metal oxidized minerals by using reduction furnace of coke-oven plant | |
| CN110066916B (en) | Method for reducing oxide minerals by using square carbonization chamber of coke-oven plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20161214 |
|
| RJ01 | Rejection of invention patent application after publication |