CN1013452B - Method of charging chromium ores in smelting reduction - Google Patents
Method of charging chromium ores in smelting reductionInfo
- Publication number
- CN1013452B CN1013452B CN 89100570 CN89100570A CN1013452B CN 1013452 B CN1013452 B CN 1013452B CN 89100570 CN89100570 CN 89100570 CN 89100570 A CN89100570 A CN 89100570A CN 1013452 B CN1013452 B CN 1013452B
- Authority
- CN
- China
- Prior art keywords
- ore
- coal
- charge chute
- iron
- heater
- 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.)
- Expired
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Abstract
This invention relates to a method of preventing, during the melt-reduction of Cr ore or iron ore, the scatter loss of the ore and coal at the time of charging. In the present invention, the ore and coal are charged down into a furnace from a shoot extended near a furnace port or connected to a furnace body. The ore and coal are charged down into the furnace while a gas is jetted outward of the shoot form nozzles disposed in the circumferential direction inside and near the tip of the shoot so that the raw materials can be charged more effectively while reducing the scatter loss.
Description
Pack into when the present invention relates to the carry out melting and reducing method of powder chrome ore raw material, iron ore and coal.
The ferrochrome exothermic that is normally made by chrome ore as stainless high chromium steel is produced as raw material.Consider from save energy and the viewpoint that reduces production costs, adopt recently directly that to produce the so-called smelting reduction process of high Cr molten iron from the Cr ore noticeable.This method be with Cr ore and coal etc. pack into the reduction converter carry out the reduction of Cr, thereby directly produce high Cr molten iron by it.
The particle diameter of Cr ore is very little, and nearly 90% particle diameter is not more than 1 millimeter in the common this ore.Therefore, when packing the powder cr ore into reduction furnace by the top, molten bath, can be by the loss that air-flow caused of rising up to 30%.
The loss that causes for avoiding powder to disperse, the someone advises adopting the pressure injection loading method, but therefore needs independently Special Equipment, and very hard Cr ore is easy to transport pipe is damaged.So in fact this loading method can not adopt.
Based on above-mentioned situation, dropped into the great number productive expense, the Cr ore is made pelletizing or agglomerate.If such ore is carried out sintering, then its specific surface area is very little, has prolonged warm up time, and the reduction rate reduction, and the treatment time is prolonged.
On the other hand, then be to adopt to replace the iron smelting method that blast furnace is produced, as mentioned above, from the save energy and the viewpoint that reduces production costs, the smelting reduction process of iron ore attracted much attention already.
Adopt this smelting and rducing iron ores method, because the particle of ore is bigger, so the loss of dispersing of ore can not become very big problem, but the coal that acts as a fuel still disperses, and loss is serious.According to present inventor's research, adopt the top loading method, so the casting yield of coal is so low, what its reason just was temperature increases the fragmentation that causes coal rapidly.Since coal disperse high temperature (being higher than 1400 ℃) with the smelting furnace bottom, so adopt the temperature of the coal that the top loading method packs into to raise suddenly, coal is broken, the Yin Gaowen very thin conny of part that is produced that breaks discharges out of the furnace with the gas that is discharged from.The consumption rate that makes carbonaceous material of dispersing of coal tends to worsen in the smelting and rducing iron ores process.
The method of dress ore provided by the invention and carbonaceous material can prevent the loss of dispersing of above-mentioned ore and fuel when carrying out melting and reducings such as Cr ore and iron ore.
In order to realize purpose of the present invention, powder cr ore or iron ore and coal are packed into by charge chute in the stove, and this charge chute extends to the converter nose that adjoins the fusion converter or is connected with body of heater, to prevent the loss of dispersing of ore and coal.
In addition, in powder cr ore, iron ore and coal are packed stove in, gas forward charge chute sprays outward, like this can charging feedstock, can prevent the loss of dispersing effectively again.
Description of drawings:
Fig. 1 to 5 relates to the high Cr iron of smelting reduction process fusion that adds the Cr ore.Fig. 1 illustrates one embodiment of the present of invention; Fig. 2 illustrates an alternative embodiment of the invention; Fig. 3 illustrates the end ejection of gas from charge chute; Fig. 4 is to the disperse research of loss of particle Cr ore about the inventive method and comparative approach; Fig. 5 is the research of Cr rate of growth in the molten metal when packing powder cr ore and pelletizing Cr ore into.
Fig. 6 to 8 relates to the smelting reduction process of iron ore.Fig. 6 illustrates one embodiment of the present of invention; Fig. 7 illustrates an alternative embodiment of the invention; Fig. 8 is to the disperse research of loss of particle Cr ore about the inventive method and comparative approach.
Among the figure, the 1st, body of heater, 6,6 ' be charge chute.
The detailed description of the invention is as follows.
Fig. 1 is the embodiment of the present invention in adding the high Cr iron of Cr ore smelting reduction process fusion, and the label 1 among the figure is a body of heater, the 2nd, and the extraction hood at body of heater top.When adopting the converter smelting reduction process, various suggestions or research are proposed for different jet modes.For example shown in Figure 1 is to carry out melting and reducing from top blowpipe 3, crosswind mouth 4 and air port, the end 5 blow gas.
During the processing, the Cr ore adds with carbonaceous material, then is to be packed into by near the charge chute 6 that extends to by extraction hood 2 converter nose by powder cr ore of the present invention.
Should make it when body of heater rotates, not brush up against body of heater when determining the height of charge chute lower end.
Fig. 2 is with the charge chute 6 ' charging of powder cr ore by being connected with body of heater 1 top, also can obtain effect same in this case.
Charge chute 6 ' can break away from 61 places, when body of heater rotates 61 this part can throw off.
For by the charge chute 6 or 6 ' Cr ore of packing into, as shown in Figure 3, gas (air or N) is sprayed outside charge chute by the nozzle 7 that the circumferential direction inside near charge chute disposes, meanwhile, the powder cr ore can be packed in the stove, can avoid the loss of dispersing of raw material so fully.
If gas sprays outside charge chute by being positioned at the nozzle of charge chute along the circumference configuration, powder cr is packed into along the gas injection direction so, just can avoid dispersing of ore fully.In addition, spray into gas and also can be used as CO and the CO that prevents stove
2Enter the purge gas of charge chute.
Fig. 6 is another embodiment that the present invention is applied to smelting and rducing iron ores, and in this embodiment, iron ore and coal add in the stove by charge chute 6.Other structure is same as shown in Figure 1.
Fig. 7 represents charge chute 6 ' adding iron ore and coal of being connected by with body of heater 1 top, and its structure is same as shown in Figure 2.
In the above method by charge chute 6 or 6 ' adding iron ore and coal, gas (air or N) by shown in Figure 3 spray to outside the charge chute by nozzle 7 in charge chute circumferential direction inside configuration in, iron ore and coal can be added in the stove, can strict prevent the loss of dispersing of raw material like this.
By method shown in Figure 1, melting and reducing is carried out in the smelting reduction converter (5 tons of capacity) of packing into of powder cr ore.To add the distribution situation of Cr ore particle diameter as follows:
+1mm +0.5mm +0.25mm +0.149mm -0.149mm
1.7% 3.8% 20.1% 42.9% 31.5%
System shown in Figure 4 is reinforced as stated above to be compared with the method reinforced (comparative approach) without charge chute, the disperse situation of loss of Cr ore, as seen from the figure, and employing the inventive method, the loss of dispersing of Cr ore significantly reduces.
The situation of Cr reduction rate (rate of growth of Cr in the molten metal) when system shown in Figure 5 in kind adds particle Cr ore and pelletizing Cr ore, as seen from the figure, the two is compared, and the former is shorter the time of preheating ore, and Cr is very fast in reduction.
By method shown in Figure 6, melting and reducing is carried out in the smelting reduction converter (5 tons of capacity) of packing into of iron ore and coal.As shown in Figure 6, relative method does not adopt charge chute, carries out melting and reducing in charging.Working condition is as follows.
Table 1
Relative method method of the present invention
Decarburization O
2(Nm
3/ hour) 1,300 1300
Secondary combustion O
2(Nm
3/ hour) 1,300 1300
Gas flow rate (meter per second) 7.7 7.7
The consumption rate 950 665 of carbonaceous material
(comprising the loss of dispersing)
(kilogram/ton molten metal)
The disperse consumption rate 285 0 of loss of carbonaceous material
(kilogram/ton molten metal)
System shown in Figure 8 compares the loss situation of dispersing of coal with not adopting charge chute (relative method), as seen from the figure, adopts the inventive method, and the loss of dispersing of coal significantly reduces.
The method of charging feedstock of the present invention or coal (for example carbonaceous material) can be used for the melting and reducing of Cr ore or iron ore.
Claims (4)
1, adopt the converter type fusion reducing furnace to carry out high C
rPowdery C packs into during the iron melting and reducing
rThe method of ore is characterized in that comprising near the charge chute by extending to the converter nose or being connected with body of heater, with powder C
rOre is packed in the stove.
2, adopt the converter type fusion reducing furnace to carry out high C
rPowdery C packs into during the iron melting and reducing
rThe method of ore is characterized in that comprising near the charge chute by extending to the converter nose or being connected with body of heater, with powder C
rOre is packed in the stove, by the nozzle that is positioned near the circumferential direction inside configuration the charge chute end gas is sprayed to outside the charge chute simultaneously.
3, adopt the converter type fusion reducing furnace to carry out high C
rPack into during the iron melting and reducing method of iron ore and coal is characterized in that comprising near the charge chute by extending to the converter nose or being connected with body of heater, and the iron ore bone coal is packed in the stove.
4, adopt the converter type fusion reducing furnace to carry out high C
rPack into during the iron melting and reducing method of iron ore and coal, it is characterized in that comprising charge chute by extending near the converter nose or being connected with body of heater, the iron ore bone coal is packed in the stove, by the nozzle that is positioned near the circumferential direction inside configuration the charge chute end gas is sprayed to outside the charge chute simultaneously.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20,472/88 | 1988-01-29 | ||
| JP63020472A JPH01165743A (en) | 1987-09-10 | 1988-01-29 | Method for charging of material in melting reduction of ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035135A CN1035135A (en) | 1989-08-30 |
| CN1013452B true CN1013452B (en) | 1991-08-07 |
Family
ID=12028044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89100570 Expired CN1013452B (en) | 1988-01-29 | 1989-01-28 | Method of charging chromium ores in smelting reduction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013452B (en) |
-
1989
- 1989-01-28 CN CN 89100570 patent/CN1013452B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035135A (en) | 1989-08-30 |
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