CN102586534B - Method for extracting iron by utilizing nickel slag and preparing fibers - Google Patents
Method for extracting iron by utilizing nickel slag and preparing fibers Download PDFInfo
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- CN102586534B CN102586534B CN 201210050302 CN201210050302A CN102586534B CN 102586534 B CN102586534 B CN 102586534B CN 201210050302 CN201210050302 CN 201210050302 CN 201210050302 A CN201210050302 A CN 201210050302A CN 102586534 B CN102586534 B CN 102586534B
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- nickel slag
- iron
- nickel
- slag
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Abstract
The invention provides a method for extracting iron by utilizing nickel slag and preparing fibers. The method comprises the following steps of: adding a reducing agent and auxiliary materials to nickel slag discharged in a nickel smelting process to reduce oxides of iron in the nickel slag into iron; after the iron is separated, adding an additive to the remaining molten nickel slag; and blowing or throwing the molten mixture with the additive through high-speed air or a centrifugation throwing machine to prepare inorganic fibers. According to the method, on the basis of melting and reducing the thermal nickel slag for refining the iron, the remaining slag is used as a main raw material to prepare the inorganic slag fibers, and the waste nickel slag is changed into valuable materials and recycled, so that the sensible heat of the thermal nickel slag is sufficiently utilized, and the energy consumption in the processes of refining the iron from the nickel slag and producing the fibers is reduced. The main components of the prepared inorganic nickel slag fibers are SiO2, Al2O3 and the like, and the prepared inorganic nickel slag fibers belong to high-temperature inorganic fibers and can be widely applied to the fields of pipe warm preservation, industrial fire resistance and warm preservation and the like.
Description
Technical field
The invention belongs to industrial residue and fully utilize the field, be specially a kind of nickel slag that utilizes and put forward iron and the method for preparing fiber.
Background technology
The nickel slag is a kind of industrial residue that discharges in the process of metal smelting nickel.The nickel slag is with Fe
2O
3, SiO
2Being main component, is the granulated slag that melts forms after shrend, also has Some Enterprises directly to efflux without shrend.The temperature of hot nickel slag is 1100～1300 ℃, contains a large amount of sensible heats.
Along with China's expanding economy, the nickel output of China increased comparatively rapid in recent years, and 1997 to be only be 40,000 tons, was 6.7 ten thousand tons in 2004,2010 nearly 90,000 tons.Adopt the Flash Smelting Furnace smelting process to produce 1 ton of nickel and need discharge 6～16 tons of nickel slags.China approximately produces 900,000 tons of nickel slags every year at present.Chemical composition and the blast-furnace slag of nickel slag are similar, but on content difference to some extent, and difference mainly contains SiO along with the difference in nickel slag melting method and ore source
2, Fe
2O
3, CaO, Al
2O
3, a small amount of Cu, Ni, S etc.
Both at home and abroad for the research of nickel slag, concentrate on wherein extraction and the recovery of Fe at present, the ferric oxide in the nickel slag is mainly with FeOSiO
2Form exist, be difficult to realize the enrichment of ferriferous oxide by the beneficiation method of routine.Technique and way that some high temperature reductions have been arranged at present, can high efficiency extraction wherein useful iron, nickel etc., but propose the utilization of the high temperature silicon hydrochlorate slag after iron, study at present lessly, way is few, still not with the technique of nickel slag inorganic fibre processed.
Summary of the invention
The technical problem that solves:
The present invention seeks to for prior art the weak point that the nickel slag utilizes, take full advantage of hot nickel slag with and the sensible heat that comprises, on the basis of fusing and reducing iron, then take recrement as main material production inorganic nickel slag fiber.
For realizing that the object of the invention technical scheme is:
A kind ofly utilizing the nickel slag to carry iron and prepare the method for fiber, at 1400～1550 ℃ of temperature, adding reductive agent and auxiliary material in the nickel slag, is iron with the Reduction of Oxide of iron in the nickel slag; After separating ferrum, add additive in remaining melting nickel slag; Add molten mixture after additive through the high-speed air winding-up or get rid of silk, making inorganic fibre (inorganic nickel slag fiber).
Wherein, described nickel slag is the waste that discharges in the nickel smelting process, and the temperature of discharging is 1100～1300 ℃; The massfraction of its main component is SiO
230～50%, Fe
2O
310～50%, Al
2O
32～10%, MgO 1～15%, and CaO 1～15%.
Wherein, the Reduction of Oxide of described iron is that the reduction reaction of iron is carried out in electric furnace; The described reductive agent that adds is a kind of in coal dust, coke or carbon dust, the iron in reducible nickel slag more than 80%.
Wherein, described auxiliary material is CaO, and the quality that adds accounts for nickel slag amount 5～30%.
Wherein, the described additive that adds is to contain Al
2O
3Or contain simultaneously SiO
2, Al
2O
3Material.
Wherein, described additive is Al
2O
3Weight content is 40～88% bauxitic clay; The part by weight that adds is that bauxitic clay accounts for nickel slag 1～30%.
Wherein, described additive is SiO
2Weight content is 20～60%, Al
2O
3Weight content is 30～50% kaolinite, and the part by weight that adds is that kaolinite accounts for nickel slag 1～30%.
Wherein, described to add the molten mixture temperature after additive be 900～1700 ℃, and its temperature is to regulate in conditioning oven.Conditioning oven is the container that utilizes electricity to heat and keep certain temperature.
Wherein, described winding-up is under pressurization 0.5～1.5MPa, by spinning jet, mixed melting liquid is emitted into silk, and the silk that obtains is cooling, makes inorganic fibre; The described silk that gets rid of is that the melt liquid that will obtain flows into tumbling machine, becomes inorganic fibre under the effect of wire swaying roller centrifugal force, and the wire swaying roller rotating speed is 2000r/min～10000r/min; Or the liquid that melting obtains is flowed into the throwing disk type wire feed mechanism gets inorganic fibre, and in the disc type tumbling machine, the rotating speed of centrifugal pan is 5000r/min～9000r/min.
Wherein, the diameter of described inorganic fibre is at 0.001mm～10mm, and length-to-diameter ratio is 10～2000.
Beneficial effect of the present invention is:
The invention provides the complete technological line that takes full advantage of the nickel slag, take full advantage of the sensible heat of hot nickel slag, when iron is carried in efficient reduction, the high temperature recrement is carried out fibrosis.Mode and method for the utilization of developing solid waste are significant.The present invention is the concrete practice of natural resources and energy resources recycling field, can take full advantage of discarded natural resources and energy resources.
The present invention proposes on the basis of hot nickel slag fusing and reducing iron, the inorganic slag fibre of preparation take its recrement as main raw material, turn waste into wealth the nickel slag again, recycles, take full advantage of simultaneously the sensible heat of hot nickel slag, significantly reduce the nickel slag and propose energy consumption in iron and fiber production process.The inorganic nickel slag fiber major ingredient that makes is SiO
2, Al
2O
3Deng, belong to high-temperature-resistant inorganic fibre, can be widely used in piping insulation, the fields such as industrial fire resistant heat preserving.
Description of drawings
Fig. 1 is the photo of the microscopically of the inorganic nickel slag fiber for preparing of the embodiment of the present invention 1.
Fig. 2 is the photo in kind of the inorganic nickel slag fiber for preparing of the embodiment of the present invention 1.
Embodiment
The raw material that embodiment adopts is the hot nickel slag that the nickel smelting process produces, wherein SiO
2Content is 30%～50%, Fe
2O
3Content is that 20%～50%, MgO content is that 1%～15%, CaO is 1%～5%, Al
2O
3Be 2%～10%, and contain a small amount of Cu, Ni, S etc., the temperature of the nickel slag that has just given off is between 1100～1300 degree.
Embodiment 1
The hot nickel slag that the nickel smelting process produces is analyzed its composition, wherein SiO with XRF (X-ray fluorescence spectra analysis) method
2Content is 45.3%, Fe
2O
339.1%, MgO content is that 2.0%, CaO is 4.5%, Al
2O
3Be 6.4%, all the other are a small amount of Cu, Ni, S etc.
The nickel slag of just having discharged is placed in cinder ladle to be incubated, cinder ladle is transported to production plant with hot nickel slag and enters electric furnace, 1500～1550 ℃ of furnace temperatures add the oxide compound of iron in the coal reduction nickel slag of nickel slag amount 5% in electric furnace, add simultaneously the CaO of massfraction 10% etc.The molten iron that separating reducing goes out is cast into ingot casting.Add the bauxitic clay of massfraction 8% (to contain Al in hot silicate recrement
2O
341%), mixture is joined in conditioning oven, control temperature to 1300 ℃.Adopt the high-speed air blowing process, jet under the pressure of 1.5MPa, obtain inorganic nickel slag fiber, this average fibre diameter is 5.0 μ m, and length-to-diameter ratio is 1000～2000, and the microphotograph of fiber is seen Fig. 1, and the photo in kind of fiber is seen Fig. 2.The inorganic nickel slag of gained fiber can be high temperature resistant 700 ℃～800 ℃, is good flame-proof thermal insulation material.
Embodiment 2
The hot nickel slag that the nickel smelting process produces is analyzed its composition, wherein SiO with XRF (X-ray fluorescence spectra analysis) method
2Content is 44.3%, Fe
2O
329.7%, MgO content is that 9.7%, CaO is 5.0%, Al
2O
3Be 5.8%, all the other are a small amount of Cu, Ni, S etc.
The hot nickel slag that the nickel smelting process is discharged is placed in the slag car and is incubated, the slag car is transported to production plant with hot nickel slag and enters electric furnace, 1400～1500 ℃ of furnace temperatures, add the oxide compound of iron in the coke reduced nickel slag of nickel slag amount 5% in electric furnace, add simultaneously the CaO of massfraction 30% etc.The molten iron that separating reducing goes out is cast into ingot casting.Add the aluminium vanadine of massfraction 8% (to contain Al in hot silicate recrement
2O
350%), mixture is joined in conditioning oven, control temperature to 1500 ℃.Adopt the high-speed air blowing process, jet under the pressure of 1.25MPa, obtain inorganic nickel slag fiber, this average fibre diameter is 5.4 μ m, and length-to-diameter ratio is 10～2000.
Embodiment 3
The hot nickel slag that the nickel smelting process produces is analyzed its composition, wherein SiO with XRF (X-ray fluorescence spectra analysis) method
2Content is 48.3%, Fe
2O
339.7%, MgO content is that 3.7%, CaO is 3.5%, Al
2O
3Be 2.8%, all the other are a small amount of Cu, Ni, S.
The hot nickel slag that the nickel smelting process is discharged is placed in cinder ladle and is incubated, cinder ladle is transported to production plant with hot nickel slag and enters electric furnace, 1500～1550 ℃ of furnace temperatures, add the oxide compound of iron in the coal reduction nickel slag of nickel slag amount 5% in electric furnace, add simultaneously the CaO of massfraction 20% etc.The molten iron that separating reducing goes out is cast into ingot casting.Add the kaolinite of massfraction 30% (to contain Al in hot silicate recrement
2O
330%, SiO
250%), mixture is joined in conditioning oven, control temperature to 1300 ℃.Use centrifugal drying silk method to obtain fiber, the wire swaying roller rotating speed is 2000r/min.Obtaining average fibre diameter is 5.9 μ m, and length-to-diameter ratio is 500～2000.
Embodiment 4
The hot nickel slag that the nickel smelting process produces is analyzed its composition, wherein SiO with XRF (X-ray fluorescence spectra analysis) method
2Content is 38.3%, Fe
2O
329.7%, MgO content is that 12.7%, CaO is 3.5%, Al
2O
3Be 8.8%, all the other are a small amount of Cu, Ni, S etc.
The hot nickel slag that the nickel smelting process is discharged is placed in cinder ladle and is incubated, cinder ladle is transported to production plant with hot nickel slag and enters electric furnace, 1500～1550 ℃ of furnace temperatures, add the oxide compound of iron in the coal reduction nickel slag of nickel slag amount 5% in electric furnace, add simultaneously the CaO of massfraction 8% etc.The molten iron that separating reducing goes out is cast into ingot casting.Add the kaolinite of massfraction 30% (to contain Al in hot silicate recrement
2O
330%, SiO
250%), mixture is joined in conditioning oven, control temperature to 1700 ℃.Use is got rid of a method and is obtained fiber, wire swaying roller rotating speed 10000r/min.The inorganic fibre mean diameter that obtains is 7.0 μ m, and length-to-diameter ratio is 10～2000.
Embodiment 5
The hot nickel slag that the nickel smelting process is produced is placed in cinder ladle and is incubated, cinder ladle is transported to production plant with hot nickel slag and enters electric furnace, add the oxide compound of iron in the carbon reducing agent nickel slag of nickel slag amount 5% in electric furnace, add simultaneously the CaO of massfraction 5% etc.The molten iron that separating reducing goes out is cast into ingot casting.Add the bauxitic clay of massfraction 30% (to contain Al in hot silicate recrement
2O
370%), mixture is joined in conditioning oven, control temperature to 900 ℃.Use the centrifugal tumbling machine of disc type to obtain fiber, centrifugal pan rotating speed 9000r/min.Obtaining average fibre diameter is 4.0 μ m, length-to-diameter ratio 10～2000.
Claims (5)
1. one kind is utilized the nickel slag to carry iron and prepares the method for fiber, it is characterized in that, adds reductive agent and auxiliary material in the nickel slag, at 1400～1550 ℃ of temperature with the nickel slag in the Reduction of Oxide of iron be iron; After separating ferrum, add additive in remaining melting nickel slag; Add molten mixture after additive through the high-speed air winding-up or get rid of silk, making inorganic fibre;
Wherein, described nickel slag is the waste that discharges in the nickel smelting process, and exhaust temperature is 1100～1300 ℃, and the massfraction of its main component is SiO
230～50%, Fe
2O
310～50%, Al
2O
32～10%, MgO1～15%, CaO1～15%;
Wherein, described additive is Al
2O
3Weight content is 40～88% bauxitic clay; The part by weight that adds is that bauxitic clay accounts for nickel slag 1～30%;
Or described additive is SiO
2Weight content is 20～60%, Al
2O
3Weight content is 30～50% kaolinite, and the part by weight that adds is that kaolinite accounts for nickel slag 1～30%;
Wherein, described to add the molten mixture temperature after additive be 900～1700 ℃, and its temperature is to regulate in conditioning oven.
2. the method for claim 1, is characterized in that, the described reductive agent that adds is a kind of in coal dust, coke or carbon dust.
3. the method for claim 1, is characterized in that, described auxiliary material is CaO, and the quality that adds accounts for nickel slag amount 5～30%.
4. described method as arbitrary in claim 1～3, is characterized in that, described winding-up is under pressurization 0.5～1.5MPa, by spinning jet, mixed melting liquid is emitted into silk, and is cooling, makes inorganic fibre; The described silk that gets rid of is that the melt liquid that will obtain flows into the roll-type tumbling machine, becomes inorganic fibre under the effect of wire swaying roller centrifugal force, and the wire swaying roller rotating speed is 2000r/min～10000r/min; Or the liquid that melting obtains is flowed into the throwing disk type wire feed mechanism gets inorganic fibre, and in the disc type tumbling machine, the rotating speed of centrifugal pan is 5000r/min～9000r/min.
5. method as claimed in claim 4, is characterized in that, the diameter of described inorganic fibre is at 0.001mm～10mm, and length-to-diameter ratio is 10～2000.
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|---|---|---|---|
| CN 201210050302 CN102586534B (en) | 2012-02-29 | 2012-02-29 | Method for extracting iron by utilizing nickel slag and preparing fibers |
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|---|---|---|---|
| CN 201210050302 CN102586534B (en) | 2012-02-29 | 2012-02-29 | Method for extracting iron by utilizing nickel slag and preparing fibers |
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| CN104451136A (en) * | 2014-11-24 | 2015-03-25 | 北京神雾环境能源科技集团股份有限公司 | Method for separating metal iron from nickel slag |
| CN108975717A (en) * | 2018-07-27 | 2018-12-11 | 湖南金业环保科技有限公司 | Nickel fibers clinker reuse method |
| CN110937876A (en) * | 2019-12-18 | 2020-03-31 | 黄河水利职业技术学院 | Polymer fiber concrete water permeable brick based on solid waste and preparation method thereof |
| CN111732990B (en) * | 2020-06-22 | 2023-04-07 | 青岛理工大学 | Preparation process and method of oxygen carrier for chemical chain gasification of carbon-containing solid waste |
| CN115259840B (en) * | 2022-08-31 | 2023-05-23 | 广东广青金属科技有限公司 | Refractory material and preparation method thereof |
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