CN101713008B - Method and device for extracting iron from melted reduced nickel slag - Google Patents
Method and device for extracting iron from melted reduced nickel slag Download PDFInfo
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- CN101713008B CN101713008B CN2008100135520A CN200810013552A CN101713008B CN 101713008 B CN101713008 B CN 101713008B CN 2008100135520 A CN2008100135520 A CN 2008100135520A CN 200810013552 A CN200810013552 A CN 200810013552A CN 101713008 B CN101713008 B CN 101713008B
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Abstract
The invention relates to the technical field of resource utilization and waste heat recovery thereof, in particular to a method and a device for extracting iron from waste slag, which are applied in the industry of iron-steel, nonferrous metallurgy and the like. The method simultaneously completes two processes of melting and reducing nickel slag on one electric furnace, and comprises: putting hot-state nickel slag and a small amount of cold-state nickel slag into the electric furnace; feeding material gradually; heating the material to between 1,500 and 1,550 DEG C in the electric furnace to melt the material to a melted state and form a certain molten pool; and gradually spraying pulverized coal to reduce iron in the nickel slag and adding lime and other auxiliary material slagging at the same time so as to realize the process of reducing the iron in the nickel slag. The method fully utilizes sensible heat during the discharge of hot slag and realizes two processes of melting and reducing in one device through re-heating temperature rise, thereby having the advantages of simple process, low cost and capability of effectively utilizing waste resources to recycle iron.
Description
Technical field
The present invention relates to a kind of utilization of resources and heat recovery technology field thereof, is a kind of all relating to that is applied in the industries such as iron and steel, Non-ferrous Metallurgy to discard the method and apparatus that slag is carried iron.
Background technology
The nickel slag is to be engaged in the waste that produces in the process of nickel smelting, and the annual quantity discharged of China's the sector reaches several ten thousand tons.Iron-holder is about 40% in the slag, about 1200 ℃ of exhaust temperature, and attach a spot of alloying element (Ni, Cu, Co etc.).Country advocated " energy-saving and emission-reduction " energetically in recent years, and optimizing resources is used the direction that exactly meets this great development, explored and study resource how to use this type of slag.Under the high temperature melt, carrying out ferriferous oxide reduction, is iron-smelting raw material with the nickel slag of molten state, and slag iron can separate fully, obtains the carbon containing molten iron of similar blast furnace.Can turn waste into wealth reaches the purpose of comprehensive utilization of resources, can fully effectively utilize the high temperature heat of melting slag, the purpose that reach energy-saving and cost-reducing, reduces production costs again.
Smelting reduction process put forward in the twenties in 20th century, and domestic Baosteel, Shoudu Iron and Steel Co, Laigang and the steel capital, Huaihe River are introduced and studied the melting and reducing technology, but the nickel slag is used for industrial a kind of reliable method that also do not have.The iron overwhelming majority in the nickel slag is that the form with pyroxene and peridotites exists, and molecular formula is FeOSiO
2(pyroxene): 2FeOSiO
2(peridotites), other main slag ingredient is CaOSiO
2(Calucium Silicate powder), its fusing point are respectively 1204 ℃ and 1440 ℃.
According to SiO2 saturation ratio Q=SiO
2/ (MgO+FeO) definition:
Should there be FeO (wustite) and 2FeOSiO in Q＜0.5 o'clock in the slag
2(peridotites)
During Q=0.5, be mainly 2FeOSiO
2(peridotites)
During Q=1, being saturated mode, mainly is FeOSiO
2(pyroxene), quartz can dissociate; (measured result calculates Q=0.79).The slag of this molecular structure, its iron can't use the method for magnetic separation to separate, and can only adopt the reduction way under the high temperature.
Summary of the invention
The method and the device that the purpose of this invention is to provide a kind of extracting iron from melted reduced nickel slag; Sensible heat when this method makes full use of the warm sludge discharging; Through heat supply intensification again; Two processes of melting reduction are realized that in a device technology is simple, cost is low, also can effectively utilize waste resource, carries out the recycling of iron.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
A kind of method of extracting iron from melted reduced nickel slag, this method are accomplished two processes of fusion of nickel slag and reduction simultaneously on an electric furnace, hot nickel slag and a small amount of cold conditions nickel slag are inserted in the electric furnace; Reinforced gradually, to 1500-1550 ℃, be melted to molten state at the electric furnace internal heating; Form certain molten bath; Spray into coal dust more gradually the iron in the nickel slag is reduced, add lime simultaneously and carry out slag making, promptly realize the process that the iron in the nickel slag is reduced with other auxiliary material.
In the described nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.055-0.3t, lime powder 0.44-0.7t, bauxitic clay 0-0.24t, iron sheet 0-0.005t, steel scrap 0-0.085t, fluorite 0-0.88t.
The device that the method for described a kind of extracting iron from melted reduced nickel slag adopts, this device is carried ferroelectric stove by one and is constituted, and comprises melt zone and reduction section; Melt zone adopts rectangular structure; The bottom is the ramp type structure, and reduction section is the open hearth bottom structure, and the bottom is the plain base structure; Melt zone and reduction section bottom communicate, and top is provided with partition wall; Melt zone top is provided with heating electrode, and the bottom is provided with the nickel slag and adds inlet; The reduction section side is provided with the pulverized coal gun inlet, and top is provided with slag former and adds inlet and smoke outlet, and the bottom is provided with molten iron outlet and slag notch.Described heating electrode is that linear pattern is arranged.
Compared with prior art, the invention has the beneficial effects as follows:
1) rationally utilizes waste resource, turn waste into wealth.
2) make full use of the sensible heat that warm sludge discharges, heat up effective use of energy sources again.
3) the device layout is easy, on a device, realizes fusion, reduction process, and less equipment investment is simple in structure.
4) reduction is carried the coal gas that produces in the iron process after the smoke outlet discharging, can carry out partially recycledly, realizes energy saving purposes.
5) hot waste can be used to produce cement or ultrafine powder, helps realizing the zero release of waste.
Description of drawings
Fig. 1 is the structure vertical view of apparatus of the present invention.
Fig. 2 is the structural front view of apparatus of the present invention.
Among the figure: 1, melt zone 2, heating electrode 3, reduction section 4, smoke outlet 5, molten iron outlet 6, spray gun inlet 7, slag notch 8, slag former add inlet 9, the nickel slag adds inlet 10, partition wall
Embodiment
Be described in detail method of the present invention and device below.
Embodiment 1
A kind of method of extracting iron from melted reduced nickel slag; After hot nickel slag and a small amount of cold conditions slag are inserted the intensification of switching in the electric furnace; When temperature reaches 1500-1550 ℃, add slag former, spray into reductive agent and other auxiliary material; Utilize the stirring action of spray gun, make the FeO reaction in reductive agent and the slag, generate metallic iron and carbon monoxide.This method is accomplished two processes of fusion of nickel slag and reduction simultaneously on an electric furnace; At the electric furnace internal heating, be melted to molten state, flow into reduction section from melt zone; Form certain molten bath at reduction section; Spray into coal dust gradually the iron in the nickel slag is reduced, add lime simultaneously and carry out slag making, promptly realize the process that the iron in the nickel slag is reduced with other auxiliary material.
After a section of reduction reaction, waste residue claws at slag notch 7, and molten iron is emitted in molten iron outlet 5.The flue gas part that whole fusion reacting by heating and reduction reaction produce should be used up at reduction section, and the residue flue gas is discharged at smoke outlet 4 and carried out the flue gas recovery.
In the nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.055t, lime powder 0.44t, iron sheet 0.001t, steel scrap 0.005t, fluorite 0.01t.
See Fig. 1, the device that the inventive method adopts is carried ferroelectric stove by one and is constituted; Comprise melt zone 1 and reduction section 3, melt zone 1 adopts rectangular structure, and the bottom is the ramp type structure; Reduction section 3 is the open hearth bottom structure; The bottom is the plain base structure, and melt zone 1 communicates with reduction section 3 bottoms, and top is provided with partition wall 10.Melt zone 1 top is provided with heating electrode 2, and the bottom is provided with the nickel slag and adds inlet 9; The reduction section side is provided with pulverized coal gun inlet 6, and top is provided with slag former and adds inlet 8 and smoke outlet 4, and the bottom is provided with molten iron outlet 5 and slag notch 7.
The three-phase electrode that the electric furnace that the present invention adopts distributes 120 common in ore-smelting furnace degree changes linear pattern into and arranges.Its concrete decoration form is seen shown in Figure 1.Be guaranteed power, capacity in the industrial production, lay two groups of X-formers in this stove, supply two cover electrodes and heat.
Through relevant experimental study, pilot-plant test has carried out 1t level 23 stoves, 2t level 47 stoves; 104 tons of co-processing wastes propose to contain Ni, and 23.5 tons of the Cu pig iron, iron yield are 84.4%; Contain Ni0.7% in the iron, Cu0.4%, output reduced iron 23.5t does raw material with this iron; Produce 32 of atmospheric corrosion resistance steel ingots 17.28t altogether, steel grade is 08CuPNi, 12MnCuCrNi and 15MnCuNi, rolls into the complete National standard of corrosion resistance nature behind the section bar; The broken secondary slag of water 50t, sampling 5t has carried out the preparation cement testing, the secondary slag amount of allocating into 75%, Al
2O
3>=12% o'clock, cement mark was greater than 425#.Meet the performance index requirement of national regulation fully.
Embodiment 2
In the nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.3t, lime powder 0.7t, bauxitic clay 0.24t, iron sheet 0.005t, steel scrap 0.085t, fluorite 0.88t.All the other technologies and content are with embodiment 1.
In the nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.15t, lime powder 0.56t, bauxitic clay 0.1t, iron sheet 0.002t, steel scrap 0.06t, fluorite 0.6t.All the other technologies and content are with embodiment 1.
Embodiment 4
In the nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.15t, lime powder 0.56t, iron sheet 0.002t, steel scrap 0.06t, fluorite 0.2t.All the other technologies and content are with embodiment 1.
In the described nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.2t, lime powder 0.6t, bauxitic clay 0.01t, steel scrap 0.085t.All the other technologies and content are with embodiment 1.
Technology of the present invention is applicable to that also other discarded slag carries iron, uses technology of the present invention and carries out other discarded slag and carry iron, also within rights protection scope of the present invention.
Claims (1)
1. the method for an extracting iron from melted reduced nickel slag is characterized in that, this method is accomplished two processes of fusion of nickel slag and reduction simultaneously on an electric furnace; Hot nickel slag and a small amount of cold conditions nickel slag are inserted in the electric furnace, and be reinforced gradually, at the electric furnace internal heating to 1500-1550 ℃; Be melted to molten state, form certain molten bath, spray into coal dust more gradually the iron in the nickel slag is reduced; Add lime simultaneously and carry out slag making, promptly realize the process that the iron in the nickel slag is reduced with other auxiliary material; In the described nickel slag raw material per ton, add coal dust, lime powder, and the weight part ratio of other auxiliary material for example down: coal dust 0.055-0.3t, lime powder 0.44-0.7t, bauxitic clay 0-0.24t, iron sheet 0-0.005t, steel scrap 0-0.085t, fluorite 0-0.88t; Described electric furnace comprises melt zone and reduction section, and melt zone adopts rectangular structure, and the bottom is the ramp type structure, and reduction section is the open hearth bottom structure, and the bottom is the plain base structure, and melt zone and reduction section bottom communicate, and top is provided with partition wall; Melt zone top is provided with heating electrode, and the bottom is provided with the nickel slag and adds inlet; The reduction section side is provided with the pulverized coal gun inlet, and top is provided with slag former and adds inlet and smoke outlet, and the bottom is provided with molten iron outlet and slag notch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100135520A CN101713008B (en) | 2008-10-08 | 2008-10-08 | Method and device for extracting iron from melted reduced nickel slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100135520A CN101713008B (en) | 2008-10-08 | 2008-10-08 | Method and device for extracting iron from melted reduced nickel slag |
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| Publication Number | Publication Date |
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| CN101713008A CN101713008A (en) | 2010-05-26 |
| CN101713008B true CN101713008B (en) | 2012-07-18 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589819A (en) * | 2013-10-12 | 2014-02-19 | 酒泉钢铁(集团)有限责任公司 | Method for directly reducing nonferrous smelting slag through oxygenation |
| CN103757170A (en) * | 2013-12-13 | 2014-04-30 | 金川集团股份有限公司 | Method for injection reduction extraction of iron from nickel smelting furnace slag |
| CN103834752B (en) * | 2014-03-04 | 2015-04-08 | 北京科技大学 | Thermal-state slag online modification device |
| CN104120209B (en) * | 2014-07-29 | 2016-08-24 | 钢铁研究总院 | A kind of liquid nickel slag melting and reducing produces the method for nickel-containing molten iron |
| CN104451018B (en) * | 2014-12-03 | 2016-10-05 | 金川集团股份有限公司 | A kind of non-ferrous metal metallurgy slag reduced iron produces the method for steel |
| CN106048122A (en) * | 2016-08-19 | 2016-10-26 | 东北大学 | Method for reduced treatment of nickel residue through slag bath |
| CN112195299B (en) * | 2020-08-18 | 2022-06-03 | 北京中冶设备研究设计总院有限公司 | Device and method for smelting ferro-silico-aluminum based on ferronickel slag of electric arc furnace |
| CN112143889B (en) * | 2020-08-18 | 2023-01-31 | 北京中冶设备研究设计总院有限公司 | Device and method for smelting ferro-silico-aluminum based on submerged arc furnace solid-state nickel-iron slag |
| CN112195300B (en) * | 2020-08-18 | 2022-06-03 | 北京中冶设备研究设计总院有限公司 | Device and method for smelting ferro-silico-aluminum from ferro-nickel slag |
| CN114804671A (en) * | 2022-04-28 | 2022-07-29 | 中国恩菲工程技术有限公司 | Method for preparing nodular cast iron grinding ball from iron-rich nickel slag and preparing cementing material in cooperation with nodular cast iron grinding ball |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4737186A (en) * | 1985-05-31 | 1988-04-12 | Outokumpu Oy | Method for continuous reduction of molten metallurical slag in an electric furnace |
| CN1791685A (en) * | 2003-05-16 | 2006-06-21 | 奥地利钢铁联合企业阿尔帕工业设备制造有限及两合公司 | Method for utilizing slag |
| CN101220438A (en) * | 2008-01-25 | 2008-07-16 | 四川川投峨眉铁合金（集团）有限责任公司 | Production method for directly smelting high-nickel ferronickel by using low-grade nickel material |
-
2008
- 2008-10-08 CN CN2008100135520A patent/CN101713008B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4737186A (en) * | 1985-05-31 | 1988-04-12 | Outokumpu Oy | Method for continuous reduction of molten metallurical slag in an electric furnace |
| CN1791685A (en) * | 2003-05-16 | 2006-06-21 | 奥地利钢铁联合企业阿尔帕工业设备制造有限及两合公司 | Method for utilizing slag |
| CN101220438A (en) * | 2008-01-25 | 2008-07-16 | 四川川投峨眉铁合金（集团）有限责任公司 | Production method for directly smelting high-nickel ferronickel by using low-grade nickel material |
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