CN1142541A - Direct reduction process of sponge iron coal base - Google Patents
Direct reduction process of sponge iron coal base Download PDFInfo
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- CN1142541A CN1142541A CN 95109269 CN95109269A CN1142541A CN 1142541 A CN1142541 A CN 1142541A CN 95109269 CN95109269 CN 95109269 CN 95109269 A CN95109269 A CN 95109269A CN 1142541 A CN1142541 A CN 1142541A
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- retort
- sponge iron
- kiln
- coal
- reduction process
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Abstract
A direct reduction process for producing sponge iron with solid coal as reducer includes mixing Fe-containing material with granular coal, loading the mixture in metallic reactors, calcining in slope-type tunnel kiln with track and selection. It features simple process, high quality and productivity and low energy consumption.
Description
The present invention relates to a kind of with the direct-reduction process of solid coal as reductive agent---coal-based method is produced the method for sponge iron.
At present, coal-based method that the direct-reduction process of production sponge iron can be divided into two kinds: the direct-reduction process of promptly using gaseous reducing agent---direct-reduction process of gas base method and use solid reductant---.Gas Ji Fayin needs resources such as Sweet natural gas and coal gas, and is higher in China industrial cost, therefore domestic kiln process and the tunnel furnace method production sponge iron that adopt in the coal-based method more.Iron ore and coal together are added in the kiln in kiln process, the reduction process (reducing atmosphere) of burning of coal process (oxidizing atmosphere) and iron ore is finished in the same space, therefore controlling suitable kiln atmosphere exists certain degree of difficulty, certainly will have influence on the reduction effect of sponge iron.In tunnel furnace method, adopt non-metallic tank splendid attire powder raw material, for ease of the sorting cleaning of sponge iron finished product, must take complicated layering tinning mode.Because of reasons such as tank body static relatively (belong to fixed-bed type smelt) and non-metallic tank heat-transfer effect are relatively poor, be unfavorable for the thermal conduction of reduction process in the reducing and smelting process, tap to tap time long (generally needing tens hours), so production efficiency is low, energy consumption is higher.
The objective of the invention is to overcome the deficiency that has Technology now and provide a kind of equipment result simple, the quality product height, production cost is low, production efficiency height, the direct reduction process of sponge iron coal base of easy handling.
The present invention is a main raw material with iron ore and coal, its production process is: pressing 100 with beans and sweetening agent as reductive agent after the iron ore fragmentation: (35～45): behind the weight ratio thorough mixing of (3～5), in the semi-enclosed cylindrical metal retort of packing into, after sealing cover retort is sent into from the kiln tail (high-end) of slope rail mounted tunnel furnace, under 950～1150 ℃ high temperature, after 3.5～5 hours smelting roasting, tank body is rolled out by kiln hood (low side), when treating that temperature is reduced to below 100 ℃, open the cover discharging, after sorting, can obtain the finished product sponge iron.
Metal reaction jar among the present invention by the effect of gravity and frictional force, makes tank body produce the revolution rolling movement in the rail mounted tunnel furnace of slope, and material also stirs thereupon and constantly in jar, has improved heat-transfer effect, has strengthened reduction process, has improved reduction rate.
The reduction process of iron ore is carried out in retort among the present invention, the heat that needs in the reduction process replenishes outside jar, the interior strongly reducing atmosphere of retort and the oxidizing atmosphere of kiln internal heating process are kept apart fully, create the smelting condition of the reduction of iron ore that is highly advantageous to, can guarantee sponge iron reduction effect preferably.
The present invention has the following advantages:
1, adopts iron ore and go back raw coal and mix charging, simplified charging method.
2, the reduction process of material in the jar has been strengthened in retort revolution rolling automatically in the rail mounted tunnel furnace of slope, has improved reduction effect, and shortened tap to tap time, has correspondingly reduced energy consumption.
3, can take the mode of production of the continuous cycle operation of multiple tank, realize continuous production, the production efficiency height.
4, the sorting scale removal process of finished product sponge iron is easy, and the product inclusion is few, the yield rate height, and quality is good.
5, equipment, work simplification, easy handling, construction investment is few, easily implements.
Fig. 1 is a slope of the present invention rail mounted tunnel furnace result schematic diagram.
Fig. 2 is a metal reaction jar result schematic diagram of the present invention.
Introduce an embodiment in detail below in conjunction with accompanying drawing.
As shown in Figure 1, hyperthermia tunnel Kiln body of heater (1) builds up the rectangular sphenoid with constant slope, and burner (2) is distributed in the middle part of body of heater, and the water-cooled track (3) on band slope is connected between the tunnel furnace gangway.
In Fig. 2, retort (4) adopts refractory metal to make, and all having venting hole (7), (9) at the bottom of the jar and on the cover, adds guide collar (8) on the tank body.
When producing, iron ore or iron ore pellets (8～15 millimeters of granularities) with after brown coal (2～10 millimeters of granularities) and unslaked lime (granularity is 1～3 millimeter) mix by 100: 40: 3 weight ratio, in several retort of packing into, kiln tail from slope rail mounted tunnel furnace rolls in proper order again, because track has the slope about 9 °, retort is revolution rolling forward automatically, entering 950～1150 ℃ high temperature section after the furnace gas preheating about 700 ℃ smelts and irons burning, after behind the temperature-fall period of cooling section, retort is rolled from kiln hood and is come out of the stove, and whole smelting process needs about 3.5～5 hours.Constantly the retort that rolls out from the kiln hood exit when temperature is reduced to below 100 ℃, is opened the cover discharging through further cooling, through screening and magnetic separation process, obtains the finished product sponge iron again.The retort of turned letter is returned charging again, enters next working cycle, so just continuously produces sponge iron.
Slope of the present invention rail mounted tunnel furnace is designed to upper and lower two-layer track, can improve plant factor, improves throughput.
Claims (3)
1, a kind of sponge iron coal-based direct reduction technology, with ferrous material and coal is main raw material, it is characterized in that after the ferrous material fragmentation with beans and sweetening agent by 100: (35～45): the weight ratio thorough mixing of (3～5), in the semi-enclosed cylindrical metal retort of packing into, after sealing cover retort is sent into from the kiln tail (high-end) of slope rail mounted tunnel furnace, under 950～1150 ℃ high temperature, after 3.5～5 hours smelting roasting, tank body is rolled out by kiln hood (low side), when treating that temperature is reduced to below 100 ℃, open the cover discharging, after screening and magnetic separation, can obtain the finished product sponge iron.
2, reducing process as claimed in claim 1, the cylindrical metal retort that it is characterized in that filling mixture by the effect of gravity and frictional force, automatically rolls tank body in the rail mounted tunnel furnace of slope along the track revolution.Material is also stirred thereupon in jar.
3, reducing process as claimed in claim 1 or 2 is characterized in that a plurality of retort sequentially feed successively, goes into kiln and smelts roasting, and operations such as kiln discharge cooling sorting, the retort cycle operation can realize the continuous production of whole process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95109269 CN1142541A (en) | 1995-08-05 | 1995-08-05 | Direct reduction process of sponge iron coal base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95109269 CN1142541A (en) | 1995-08-05 | 1995-08-05 | Direct reduction process of sponge iron coal base |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1142541A true CN1142541A (en) | 1997-02-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95109269 Pending CN1142541A (en) | 1995-08-05 | 1995-08-05 | Direct reduction process of sponge iron coal base |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1142541A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067436C (en) * | 1998-09-28 | 2001-06-20 | 冶金工业部北京冶金设备研究院 | Technology for directly reducing iron with coal base in pot furnace |
| CN1300343C (en) * | 2005-08-31 | 2007-02-14 | 吉林省杉松岗矿业集团复森海绵铁有限公司 | Sponge iron production method |
| WO2013011521A1 (en) | 2011-07-18 | 2013-01-24 | Tata Steel Limited | A method for direct reduction of oxidized chromite ore fines composite agglomerates in a tunnel kiln using carbonaceous reductant for production of reduced chromite product/ agglomerates applicable in ferrochrome or charge chrome production. |
| CN110106302A (en) * | 2019-06-17 | 2019-08-09 | 山东省机械设计研究院 | A kind of device producing sponge iron, system and method |
| CN113265507A (en) * | 2021-06-28 | 2021-08-17 | 王恩礼 | Oxygen-free reduction process for iron oxide ore and closed reduction converter thereof |
-
1995
- 1995-08-05 CN CN 95109269 patent/CN1142541A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067436C (en) * | 1998-09-28 | 2001-06-20 | 冶金工业部北京冶金设备研究院 | Technology for directly reducing iron with coal base in pot furnace |
| CN1300343C (en) * | 2005-08-31 | 2007-02-14 | 吉林省杉松岗矿业集团复森海绵铁有限公司 | Sponge iron production method |
| WO2013011521A1 (en) | 2011-07-18 | 2013-01-24 | Tata Steel Limited | A method for direct reduction of oxidized chromite ore fines composite agglomerates in a tunnel kiln using carbonaceous reductant for production of reduced chromite product/ agglomerates applicable in ferrochrome or charge chrome production. |
| CN110106302A (en) * | 2019-06-17 | 2019-08-09 | 山东省机械设计研究院 | A kind of device producing sponge iron, system and method |
| CN113265507A (en) * | 2021-06-28 | 2021-08-17 | 王恩礼 | Oxygen-free reduction process for iron oxide ore and closed reduction converter thereof |
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