CN104611499A - Method for processing direct reduced iron before fed into electric furnace - Google Patents
Method for processing direct reduced iron before fed into electric furnace Download PDFInfo
- Publication number
- CN104611499A CN104611499A CN201510002799.2A CN201510002799A CN104611499A CN 104611499 A CN104611499 A CN 104611499A CN 201510002799 A CN201510002799 A CN 201510002799A CN 104611499 A CN104611499 A CN 104611499A
- Authority
- CN
- China
- Prior art keywords
- reduced iron
- direct
- cooling
- electric furnace
- treatment process
- 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
Abstract
The invention provides a method for processing direct reduced iron before the direct reduced iron is fed into an electric furnace. The method comprises the following steps: cooling direct reduced iron to obtain cooled direct reduced iron; sieving the cooled direct reduced iron to obtain cooled direct reduced iron which is suitable for being smelted in the electric furnace and has qualified granularity, bulk cooled direct reduced iron of which granularity is larger than the qualified granularity, and powdery cooled direct reduced iron of which granularity is smaller than the qualified granularity; crushing the bulk cooled direct reduced iron to obtain cooled direct reduced iron with qualified granularity; briquetting the powdery cooled direct reduced iron to obtain cooled direct reduced iron with qualified granularity; feeding the cooled direct reduced iron with qualified granularity and the briquetted cooled direct reduced iron into the electric furnace for smelting. According to the method, the fluidity of a material, the accuracy of weighing, the feeding furnace efficiency and the like are effectively improved.
Description
Technical field
The invention belongs to field of metallurgy, specifically, the present invention relates to the treatment process that direct-reduced iron enters electric furnace.
Background technology
Existing direct-reduced iron from reduction furnace out after, temperature about 800 ~ 1100 DEG C.Usual direct-reduced iron to go out after reduction furnace by outer water-spraying control, then delivers to electrosmelting or delivers to stored for future use in storehouse.Or be pressed into pulvinulus head hot wafering (HBI) with thermal briquetting machine after going out reduction furnace, after water-spraying control, send electrosmelting or send storehouse stored for future use.Moreover load in batch can immediately add a cover insulation by going out the direct-reduced iron after reduction furnace, then by trailer or crane, complete horizontal and vertical and be transported on electric furnace top, hot charging enters material-storage jar, through diverting valve, weighing, self-conveyor feed, tremie pipe is sent in electric furnace.
But the defects such as aforesaid method has easy blocking, difficulty of feeding in raw material, structure deteriorate are large, electrosmelting weak effect.
Summary of the invention
The present invention is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose the treatment process that a kind of direct-reduced iron enters electric furnace, utilizes the method effectively can improve the mobility of material, the wearing quality of feed device, the accuracy etc. of weighing device.
According to an aspect of the present invention, the present invention proposes the treatment process that a kind of direct-reduced iron enters electric furnace, comprising:
Direct-reduced iron is carried out cooling process, to obtain cooling direct-reduced iron;
Described cooling direct-reduced iron is sieved, so as to obtain the cooling direct-reduced iron of the release mesh being suitable for electrosmelting, powdery cooling direct-reduced iron that bulk cooling direct-reduced iron that granularity is greater than release mesh and granularity are less than release mesh;
Described bulk cooling direct-reduced iron is carried out break process, to obtain the cooling direct-reduced iron of release mesh;
Described powdery cooling direct-reduced iron is carried out briquetting process, to obtain the briquetting cooling direct-reduced iron of release mesh;
The cooling direct-reduced iron of described release mesh and described briquetting cooling direct-reduced iron are delivered to electrosmelting.
Utilize the method effectively to solve and directly the direct-reduced iron of high temperature be transported to the poor fluidity existed in electric furnace, easily lump, easy blocking, and high temperature to the damage of equipment and cause weighing difficulty etc. defect.
In some embodiments of the invention, described direct-reduced iron is by directly carrying out smelting by iron ore obtaining, and the temperature of described direct-reduced iron is 800 ~ 100 degrees Celsius.
In some embodiments of the invention, the temperature of described cooling direct-reduced iron is for being not more than 100 degrees Celsius.Conveniently can carry out subsequent disposal to direct-reduced iron thus.
In some embodiments of the invention, the mean particle size of described bulk cooling direct-reduced iron is for being greater than 50 millimeters.The bulk direct-reduced iron of easy blocking equipment can be isolated thus, improve into the efficiency of furnace.
In some embodiments of the invention, the mean particle size of described powdery cooling direct-reduced iron is for being less than 2 millimeters.Can isolate the too small direct-reduced iron of particle diameter thus, raising direct-reduced iron enters the reduction efficiency after electric furnace.
In some embodiments of the invention, the mean particle size of the cooling direct-reduced iron of described release mesh is 2 ~ 50 millimeters.Can improve into the efficiency of furnace thus, improve direct-reduced iron simultaneously and enter the reduction efficiency after electric furnace.
In some embodiments of the invention, described briquetting cooling direct-reduced iron is rectangular shape.Can improve into the efficiency of furnace thus.
In some embodiments of the invention, described bulk cooling direct-reduced iron is of a size of 13 × 20 × 40 (unit is mm).Can improve into the efficiency of furnace thus.
In some embodiments of the invention, the cooling direct-reduced iron that the granularity obtained after the fragmentation of described bulk cooling direct-reduced iron is less than release mesh cools briquetting together with direct-reduced iron with described powdery.
In some embodiments of the invention, described direct-reduced iron is in water-jacket typ cooling cylinder, utilize pressurized water to carry out cooling process when isolated air.Direct-reduced iron can be avoided thus oxidized.
Accompanying drawing explanation
Fig. 1 is that direct-reduced iron enters the schema of the treatment process of electric furnace according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Due to direct-reduced iron temperatures as high 800 ~ 1000 DEG C, the surface of direct-reduced iron is at such a temperature soft heat state, has certain viscosity, causes mutual frictional force large.Therefore in feed device, mobility is poor, can lump in tank, arch camber, blanking difficulty, need manually to beat dredging.Secondly, the temperature of direct-reduced iron is high, also can cause the expansion of weighing device element, weighs operational difficulty and weighing result is inaccurate, the full and material spacing wave of the material of hopper even can be caused can not send out out, affect automated job.3rd, under the high temperature action of direct-reduced iron, easily there is distortion, cracking, quick abrasion in the equipment such as self-conveyor feed, tremie pipe and hopper, causes leaking hot dust and flue gas.4th, the direct-reduction pellet in a shotgun cartridge of high temperature contacts with air in transportation, easily oxidized.5th, hot direct reduced iron often has bulk to occur, causes blocking.6th, with hot batch can conveying transhipment, when many electric furnace scale operation, Transportation Organization is quite difficult, and efficiency is low, and turnover equipment is many, and plane and flyover are disturbed mutually, and total figure arranges very difficult.
Therefore, consider the many disadvantages that the existing technique joined by direct-reduced iron in electric furnace exists, the present invention proposes the treatment process that a kind of direct-reduced iron enters electric furnace, comprising:
Direct-reduced iron is carried out cooling process, to obtain cooling direct-reduced iron;
Cooling direct-reduced iron is sieved, so as to obtain the cooling direct-reduced iron of the release mesh being suitable for electrosmelting, powdery cooling direct-reduced iron that bulk cooling direct-reduced iron that granularity is greater than release mesh and granularity are less than release mesh;
Bulk is cooled direct-reduced iron and carry out break process, to obtain the cooling direct-reduced iron of release mesh;
Powdery is cooled direct-reduced iron and carry out briquetting process, to obtain the briquetting cooling direct-reduced iron of release mesh;
The cooling direct-reduced iron of release mesh and briquetting cooling direct-reduced iron are delivered to electrosmelting.
Utilize the method effectively to solve and directly the direct-reduced iron of high temperature be transported to the poor fluidity existed in electric furnace, easily lump, easy blocking, and high temperature to the damage of equipment and cause weighing difficulty etc. defect.
The direct-reduced iron describing the above embodiment of the present invention in detail below with reference to Fig. 1 enters the treatment process of electric furnace.
S100: cooling process
According to a particular embodiment of the invention, first direct-reduced iron is carried out cooling process, to obtain cooling direct-reduced iron.According to concrete example of the present invention, direct-reduced iron is by directly carrying out smelting by iron ore obtaining, and the temperature of direct-reduced iron is 800 ~ 1000 degrees Celsius.
According to a particular embodiment of the invention, cooling process can be carried out in the water-jacket typ cooling cylinder of the high pressure height water speed of isolated air, and this equipment is small and exquisite, and energy consumption is low, and cooling efficiency is high, and can effectively prevent direct-reduced iron oxidized.And adopt water-jacket typ cooling cylinder can avoid fog water jet compared with barrel shrond steaming, contaminate environment, the irretrievable defect of moisture.Therefore, the present invention adopts water-jacket typ cooling cylinder to carry out cooling process to direct-reduced iron, and not only speed of cooling is fast, can also prevent the direct-reduced iron of high temperature from contacting oxidized with empty G&W.
According to a particular embodiment of the invention, the cooling direct-reduced iron degree of metalization obtained through above-mentioned cooling process does not reduce, and temperature is reduced to and is not more than 100 degrees Celsius, can be suitable for conveyor drive transport.
In existing correlation technique, direct-reduced iron is directly delivered in electric furnace more by the mode of hot charging that adopts, and then utilizes the sensible heat of direct-reduced iron to save the energy consumption of electric furnace.But hot-assembling method has a lot of negative impacts, such as, the surface of direct-reduced iron is soft heat state, causes poor fluidity; Can lump in tank, arch camber, blanking difficulty, need manually to beat dredging; High temperature causes equipment seriously impaired, cannot precise etc.
The present inventor carrys out the quality of comprehensive evaluation two kinds of methods by the energy consumption carefully analyzing hot charging and cold charge.Contriver finds, every 100 DEG C can be fallen power consumption 25kwh in theory, go out the direct-reduced iron of 800 ~ 1000 DEG C of reduction furnace through repeatedly having bad luck, storage, shunting, self-conveyor feed feeds in raw material, the temperature finally entering electric furnace only has 500 ~ 600 DEG C, power saving can be about 125kwh at most.Obviously, in order to save the power consumption of 125kwh and the negative impact brought is too serious.Therefore, the present inventor is clearly the Positive and Negative Aspects having recognized hot charging.After adopting aforesaid method of the present invention to carry out pre-treatment to direct Ei reduced iron thus, can significantly improve into the efficiency of furnace, reduce into stove cost.
S200: screening
According to a particular embodiment of the invention, further cooling direct-reduced iron is sieved, so as to obtain the cooling direct-reduced iron of the release mesh being suitable for electrosmelting, powdery cooling direct-reduced iron that bulk cooling direct-reduced iron that granularity is greater than release mesh and granularity are less than release mesh.According to a particular embodiment of the invention, sieve classification process, is divided into above-mentioned three grades of products by the direct-reduced iron of cooling.
According to a particular embodiment of the invention, the cooling direct-reduced iron that the powdery cooling direct-reduced iron that to be divided into by cooling direct-reduced iron mean particle size to be bulk cooling direct-reduced iron, the mean particle size being greater than 50 millimeters being and to be less than 2 millimeters and mean particle size are the release mesh of 2 ~ 50 millimeters is sieved.
According to a particular embodiment of the invention, mean particle size is that the cooling direct-reduced iron granularity of the release mesh of 2 ~ 50 millimeters is moderate, directly can be delivered in electric furnace and process, substantially harmless to electric furnace, and can significantly improve efficiency.And mean particle size to be the bulk cooling direct-reduced iron being greater than 50 millimeters easily cause blocking in course of conveying, large on electric furnace impact, therefore should not directly be delivered in electric furnace.And mean particle size be less than 2 millimeters powdery cooling direct-reduced iron easily taken away by flue gas at electric furnace, be therefore also not easily directly delivered in electric furnace.
S300: break process
Because the granularity of bulk cooling direct-reduced iron is comparatively large, in conveying charging process, usually cause the blocking of the devices such as hopper, diverting valve, self-conveyor feed, tremie pipe, not blanking, causes conveying obstacle, and that reduces direct-reduced iron enters the efficiency of furnace.Even and if enter stove, and also comparatively large to the loss of electric furnace after entering stove, be unfavorable for improving efficiency.For this reason, according to a particular embodiment of the invention, in advance bulk is cooled direct-reduced iron and carry out break process, to obtain the cooling direct-reduced iron of release mesh.Therefore bulk is cooled direct-reduced iron and carries out the serious blocking problem that simple break process effectively can solve said apparatus, so significantly improve direct-reduced iron enter the efficiency of furnace, improve electrosmelting efficiency.
S400: briquetting process
According to a particular embodiment of the invention, powdery cooling direct-reduced iron about containing about 20% in usual direct-reduced iron, after it is directly delivered to electric furnace, about 3 ~ 5% powder powdery cooling direct-reduced irons can be taken away by electric furnace flue gas, flue gas is after water washing collection, powdery cooling direct-reduced iron is wherein oxidized, needs to dry and again reduces, add power consumption and cost.Therefore, although the powdery that particle diameter is less than 2mm cools the blocking that direct-reduced iron can not cause equipment, be also not easily directly delivered in electric furnace.
According to a particular embodiment of the invention, powdery is cooled direct-reduced iron and carry out briquetting process, to obtain the bulk cooling direct-reduced iron of release mesh.Effectively can prevent from powdery from cooling direct-reduced iron thus to be taken away by flue gas in electric furnace, and then save energy consumption, that improves direct-reduced iron enters the efficiency of furnace.
According to a particular embodiment of the invention, in powdery cooling direct-reduced iron, add binding agent pair roller ball press be pressed into rectangular parallelepiped or flat spheroid, angle can be arc transition shape.According to a particular embodiment of the invention, the size of the bulk cooling direct-reduced iron of rectangular parallelepiped can be 13 × 20 × 40 (unit mm).
According to a particular embodiment of the invention, the cooling direct-reduced iron that the granularity obtained after the fragmentation of bulk cooling direct-reduced iron is less than release mesh can cool briquetting together with direct-reduced iron with above-mentioned powdery.Energy consumption can be saved thus.
According to the specific embodiment of the invention, finally the cooling direct-reduced iron of release mesh and block cooling direct-reduced iron are delivered to electrosmelting or entrepot storage.Thus, when reduction furnace idling period, electric furnace can use the direct-reduced iron stored in entrepot storage; When electric furnace stops production, the direct-reduced iron after process can be kept in in entrepot storage.Therefore, the shock absorption of entrepot storage is that reduction furnace and working alone of electric furnace provide safeguard.
According to a particular embodiment of the invention, the direct-reduced iron of output in reduction furnace is processed into the cooling direct-reduced iron that mean particle size is the release mesh of 2 ~ 50 millimeters by the treatment process adopting the direct-reduced iron of the above embodiment of the present invention to enter electric furnace, not only can improve into the efficiency of furnace, the tolerance range of the furnace entering volume of direct-reduced iron can also be improved simultaneously, improve the specific surface area of direct-reduced iron, and then significantly improve the reduction ratio of direct-reduced iron in electric furnace.
Embodiment
Cooled fast in the water-jacket typ cooling cylinder of the high pressure height water speed of isolated air by the direct-reduced iron of discharging in reduction furnace, high-temperature direct reduced iron temperature being about 900 degrees Celsius is down to about 50 degrees Celsius.Cooled direct-reduced iron is carried out whole grain screening process, obtain particle diameter and be greater than 50 millimeters, be less than three kinds of direct-reduced irons between 2 millimeters and 2 ~ 50 millimeters.Particle diameter is wherein greater than 50 millimeters and carries out break process, its particle diameter is made to reach 2 ~ 50 millimeters, the direct-reduced iron being less than 2 millimeters is carried out briquetting process, is pressed into the block direct-reduced iron of the rectangular parallelepiped being of a size of 13 × 20 × 40mm, the corner angle of rectangular parallelepiped are arc transition shape.Finally direct-reduced iron qualified for granularity and block cooling direct-reduced iron are delivered to electric furnace or entrepot storage.
The efficiency be delivered to by direct-reduced iron after above-mentioned process in electric furnace can meet the requirement of direct-reduction iron needed for reduction reaction in electric furnace.Enter electric furnace after being processed by direct-reduced iron by aforesaid method, the tolerance range of furnace entering volume can reach 1%, and loading device casualty ratio of accidents greatly reduces, and electric furnace operating rate is improved.
In the description of this specification sheets, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term need not for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification sheets or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (10)
1. direct-reduced iron enters a treatment process for electric furnace, it is characterized in that, comprising:
Direct-reduced iron is carried out cooling process, to obtain cooling direct-reduced iron;
Described cooling direct-reduced iron is sieved, so as to obtain the cooling direct-reduced iron of the release mesh being suitable for electrosmelting, powdery cooling direct-reduced iron that bulk cooling direct-reduced iron that granularity is greater than release mesh and granularity are less than release mesh;
Described bulk cooling direct-reduced iron is carried out break process, to obtain the cooling direct-reduced iron of release mesh;
Described powdery cooling direct-reduced iron is carried out briquetting process, to obtain the briquetting cooling direct-reduced iron of release mesh; And
The cooling direct-reduced iron of described release mesh and described briquetting cooling direct-reduced iron are delivered to electrosmelting.
2. direct-reduced iron enters the treatment process of electric furnace according to claim 1, it is characterized in that, described direct-reduced iron is by directly carrying out smelting by iron ore obtaining, and the temperature of described direct-reduced iron is 800 ~ 100 degrees Celsius.
3. according to claim 1 or 2, direct-reduced iron enters the treatment process of electric furnace, it is characterized in that, the temperature of described cooling direct-reduced iron is for being not more than 100 degrees Celsius.
4. according to any one of claim 1-3, direct-reduced iron enters the treatment process of electric furnace, it is characterized in that, the mean particle size of described bulk cooling direct-reduced iron is for being greater than 50 millimeters.
5. according to any one of claim 1-4, direct-reduced iron enters the treatment process of electric furnace, it is characterized in that, the mean particle size of described powdery cooling direct-reduced iron is for being less than 2 millimeters.
6. according to any one of claim 1-5, direct-reduced iron enters the treatment process of electric furnace, it is characterized in that, the mean particle size of the cooling direct-reduced iron of described release mesh is 2 ~ 50 millimeters.
7. direct-reduced iron enters the treatment process of electric furnace according to claim 1, it is characterized in that, described briquetting cooling direct-reduced iron is rectangular shape.
8. direct-reduced iron enters the treatment process of electric furnace according to claim 7, it is characterized in that, described briquetting cooling direct-reduced iron is of a size of 13 × 20 × 40 (unit is mm).
9. according to any one of claim 1-8, direct-reduced iron enters the treatment process of electric furnace, it is characterized in that, the cooling direct-reduced iron that the granularity obtained after described bulk cooling direct-reduced iron break process is less than release mesh cools briquetting together with direct-reduced iron with described powdery.
10. according to any one of claim 1-9, direct-reduced iron enters the treatment process of electric furnace, it is characterized in that, described direct-reduced iron is in water-jacket typ cooling cylinder, utilize pressurized water to carry out cooling process when isolated air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002799.2A CN104611499A (en) | 2015-01-04 | 2015-01-04 | Method for processing direct reduced iron before fed into electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510002799.2A CN104611499A (en) | 2015-01-04 | 2015-01-04 | Method for processing direct reduced iron before fed into electric furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104611499A true CN104611499A (en) | 2015-05-13 |
Family
ID=53146146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510002799.2A Pending CN104611499A (en) | 2015-01-04 | 2015-01-04 | Method for processing direct reduced iron before fed into electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104611499A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080961A (en) * | 1992-12-23 | 1994-01-19 | 东北工学院 | The method and apparatus of reducing spongy iron in coal-base shaft furnace |
| CN102766718A (en) * | 2012-07-24 | 2012-11-07 | 新冶高科技集团有限公司 | Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash |
| CN102994679A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Method and equipment for producing high-quality sponge iron for reduced iron powder |
-
2015
- 2015-01-04 CN CN201510002799.2A patent/CN104611499A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080961A (en) * | 1992-12-23 | 1994-01-19 | 东北工学院 | The method and apparatus of reducing spongy iron in coal-base shaft furnace |
| CN102766718A (en) * | 2012-07-24 | 2012-11-07 | 新冶高科技集团有限公司 | Method for producing sponge iron and zinc-rich materials by blast furnace zinc-containing ash |
| CN102994679A (en) * | 2012-12-26 | 2013-03-27 | 武汉桂坤科技有限公司 | Method and equipment for producing high-quality sponge iron for reduced iron powder |
Non-Patent Citations (3)
| Title |
|---|
| （苏）雷斯著，周进华、于忠译: "《铁合金冶炼》", 30 November 1981, 冶金工业出版社 * |
| 中国冶金百科全书总编辑委员会: "《《中国冶金百科全书 冶金溅射 上》》", 31 January 1999, 冶金工业出版社 * |
| 徐行南: "《上海冶金情报》", 31 December 1999 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104109755B (en) | A kind of dedusting ash is colded pressing metal pelletizing production system and method | |
| CN103088209B (en) | Floating and smelting combined method for air-granulating lead smelting slag and utilizing waste heat | |
| CN109295316A (en) | The recovery process of vanadium in vanadium containing steel slag | |
| CN101342540B (en) | Method for recycling casting residue | |
| CN104561405A (en) | Hot steel-making slag high-temperature solidification, pelletization and heat recovery method and equipment system thereof | |
| CN101942535B (en) | Method for utilizing and recycling solid waste of cyclone ash by spraying through blast-furnace tuyere | |
| CN105603197A (en) | Device and process for directly reducing smelt antimony from antimony slag and antimony ash | |
| CN105039681B (en) | A kind of manufacture method of alkaline magnesium-rich pellet nodulizing | |
| CN102815731A (en) | Smelting technique of brown corundum | |
| CN102994679A (en) | Method and equipment for producing high-quality sponge iron for reduced iron powder | |
| JP5998845B2 (en) | Heat recovery system and heat recovery method for solidified slag | |
| KR100645082B1 (en) | A method synthesize again waste matters and using an aduit form device | |
| CN204022910U (en) | A kind of dedusting ash is colded pressing metal pelletizing production system | |
| EP2875161B1 (en) | Process for the optimized production of iron ore pellets | |
| CN210596200U (en) | Processing apparatus of high-efficient zinc that removes in follow iron and steel enterprise's zinciferous fly ash | |
| CN218884626U (en) | Coal gangue sintering material shaft furnace cooling device | |
| CN104611499A (en) | Method for processing direct reduced iron before fed into electric furnace | |
| CN105861819A (en) | Pressing block production process for oxide iron scale cutting slag added with metal bonding agent | |
| CN113215334B (en) | Slag treatment system and method | |
| CN104946853A (en) | Metallurgy lime powder utilization system and technology method | |
| CN112961980B (en) | Working method of waste recycling system in metallurgical industry | |
| CN103697709A (en) | Method for dehydrating limonite by means of sintering waste heat | |
| CN103805727A (en) | Direct reduction iron hot-charging method by use of chain conveyer | |
| CN112877491A (en) | Vertical coal-based and gas-based mixed metal iron direct reduction furnace and process thereof | |
| CN206521505U (en) | Pre-reduced pellet direct-furnish electric furnace hot charging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150513 |