CN103602846A - Method for producing ferrosilicon alloy by use of silica fume - Google Patents
Method for producing ferrosilicon alloy by use of silica fume Download PDFInfo
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- CN103602846A CN103602846A CN201310545060.7A CN201310545060A CN103602846A CN 103602846 A CN103602846 A CN 103602846A CN 201310545060 A CN201310545060 A CN 201310545060A CN 103602846 A CN103602846 A CN 103602846A
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- silica fume
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- pelletizing
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- 229910000519 Ferrosilicon Inorganic materials 0.000 title claims abstract description 117
- 229910021487 silica fume Inorganic materials 0.000 title claims abstract description 79
- 238000004519 manufacturing process Methods 0.000 title abstract description 15
- 229910045601 alloy Inorganic materials 0.000 title abstract description 8
- 239000000956 alloy Substances 0.000 title abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 108
- 238000000034 method Methods 0.000 claims abstract description 72
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052742 iron Inorganic materials 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 29
- 239000008188 pellet Substances 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims abstract description 18
- 238000007670 refining Methods 0.000 claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 51
- 238000005453 pelletization Methods 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 15
- 241001062472 Stokellia anisodon Species 0.000 claims description 10
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 8
- 239000011280 coal tar Substances 0.000 claims description 7
- 239000002028 Biomass Substances 0.000 claims description 6
- 239000003610 charcoal Substances 0.000 claims description 6
- 239000000571 coke Substances 0.000 claims description 6
- 229920002522 Wood fibre Polymers 0.000 claims description 4
- 239000011294 coal tar pitch Substances 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 25
- 229910052710 silicon Inorganic materials 0.000 abstract description 24
- 239000010703 silicon Substances 0.000 abstract description 24
- 239000002994 raw material Substances 0.000 abstract description 6
- 229910001021 Ferroalloy Inorganic materials 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 239000012141 concentrate Substances 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 19
- 229910052804 chromium Inorganic materials 0.000 description 18
- 229910052748 manganese Inorganic materials 0.000 description 18
- 238000007664 blowing Methods 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 12
- 229910052802 copper Inorganic materials 0.000 description 12
- 229910052749 magnesium Inorganic materials 0.000 description 12
- 229910052759 nickel Inorganic materials 0.000 description 12
- 229910052698 phosphorus Inorganic materials 0.000 description 12
- 229910052717 sulfur Inorganic materials 0.000 description 12
- 229910052719 titanium Inorganic materials 0.000 description 12
- 229910052720 vanadium Inorganic materials 0.000 description 12
- 235000010755 mineral Nutrition 0.000 description 9
- 239000007789 gas Substances 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for producing a ferrosilicon alloy by use of silica fume, belonging to the technical field of ferrosilicon alloy and industrial silicon. The method comprises the steps of firstly adding a binder and water into silica fume and granular silica, mixing uniformly and pressing into pellets; in a reducing atmosphere, drying the pellets obtained by the previous step; putting the dried pellets and a carbonaceous reducing agent into a metallurgical furnace; pre-roasting the pellets and carbonaceous reducing agent in a descending process from the furnace mouth of the metallurgical furnace to a high-temperature area; smelting the pellets and carbonaceous reducing agent in the high-temperature area of the metallurgical furnace while adding steel cuttings, steel rolling iron sheet and iron ore concentrate iron-containing raw material in the smelting process to obtain a ferrosilicon alloy melt; performing external refining of the ferrosilicon alloy melt obtained by the previous step to obtain the ferrosilicon alloy. According to the method provided by the invention, the silica fume and granular silica are pelletized to serve as a silicon source to produce the ferrosilicon alloy, so that an effective means of utilizing the waste silica fume and granular silica in the production process of the ferroalloy industry is provided.
Description
Technical field
The present invention relates to a kind of method of utilizing SILICA FUME to produce ferro-silicon, belong to ferro-silicon and industrial silicon technical field.
Background technology
Ferro-silicon and industrial silicon belong to the Si system alloy in the ferroalloy industry, in steel-making, casting, non-ferrous metal and other industrial production, are widely used.The production of ferro-silicon and industrial silicon is all to take silica as raw material, after washing, mixes and adds mineral hot furnace with carbonaceous reducing agent, and under hot conditions, carbothermic reduction obtains ferro-silicon and Pure Silicon Metal.
In ferro-silicon and industrial silicon production, in order to guarantee the ventilation property of furnace charge, require furnace charge in certain size range.In silicon ore cleaning process, the silicon ore of particle diameter <20mm will be sized, in order to avoid enter in mineral hot furnace, affect the ventilation property of furnace charge.Owing to lacking, effectively utilize approach, the silicon ore of this part particle diameter <20mm conventionally goes out of use and stores up, and causes the waste of silicon ore resources, has increased the production cost of ferro-silicon and industrial silicon simultaneously.
The flue gas producing in ferro-silicon and industrial silicon production process is rich in a large amount of fine silica powders, obtains dioxide-containing silica and be 80 ~ 95% SILICA FUME after dust removal installation is collected.China ferroalloy works every production 5t ferrosilicon will produce 1t SILICA FUME; Every production 3t industrial silicon will produce 1t SILICA FUME.According to statistics, China's ferrosilicon output in 2012 is that 4,780,000 t, industrial silicon output are 1,130,000 t.Correspondingly, only 2012 Nian Yinian， China will produce SILICA FUME 1,330,000 t.At present, SILICA FUME is mainly used in the fields such as concrete, refractory materials as additive, and usage quantity is little, and economic worth is low.Cause SILICA FUME slack market, there is on-site in a large amount of heaps, had both taken producing region area, brings pollution to again environment around.
At present, for the small particle size silicon ore producing in ferro-silicon and industrial silicon production process (particle diameter <20mm) and SILICA FUME, still do not utilize preferably approach.There is on-site in a large amount of small particle size silicon ores and SILICA FUME heap, has not only caused the waste of silicon ore resource, reduced the economic benefit of factory, also taken large stretch of producing region area ，Gei plant area surrounding enviroment simultaneously and brought pollution, threatens Enterprise Healthy Development.How effectively to utilize small particle size silicon ore and SILICA FUME to become the ferroalloy industry problem demanding prompt solution.
Summary of the invention
The problem and the deficiency that for above-mentioned prior art, exist, the invention provides a kind of method of utilizing SILICA FUME to produce ferro-silicon.Present method utilizes SILICA FUME and small-particle silica pelletizing to produce ferro-silicon as silicon source, for SILICA FUME discarded in the ferroalloy industry production process and small-particle silica provide the approach that effectively utilizes.
Utilize SILICA FUME to produce a method for ferro-silicon, its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 2～12% and the water of SILICA FUME quality 3～15% to mix in SILICA FUME and small-particle silica, under the pressure of 5～30t, be pressed into pelletizing;
(2) under reducing atmosphere, the pelletizing that step (1) obtains in temperature, be dry under the condition of 100～300 ℃ after, by mass ratio, be (2.4～3.0): it is in the metallurgical furnace of 800～1200 ℃ that the dried pelletizing of (1.0～2.0) and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 0.5～2h under 1800～2500 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
SiO in described SILICA FUME
2content is greater than 80wt.%, Al
2o
3content is less than 2wt.%.
Described small-particle silica particle diameter is below 5mm, and add-on is below 50% of SILICA FUME quality.
Described binding agent is one or more the arbitrary proportion mixtures in coal tar, coal-tar pitch, wood fibre.
The pelletizing particle diameter that described step (1) obtains is 25～150mm.
Described carbonaceous reducing agent is coke, charcoal, coal, refinery coke, biomass or biomass charcoal.
Described metallurgical furnace is mineral hot furnace.
The addition of described steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009.
In above-mentioned steps (2), be 0.5～6h the time of drying of pelletizing.
Above-mentioned external refining process is for removing impurity element to obtain the ferro-silicon product that meets standard GB/T/T2272-2009 by technique means such as air blowing, slag making.
Air blowing process is: toward the mixed gas that is blown into one or more arbitrary proportions in a certain amount of oxygen-rich air, oxygen, chlorine in ferro-silicon melt, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, blow gas pressure is 2～8atm, and flow is 0.1～1hm
3/ min, the time is 0.5～5h.
Slagging process is: in ferro-silicon melt, add a certain amount of synthetic slag, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, the composition of synthetic slag comprises one or more in unslaked lime, quartz sand, fluorite, iron phosphorus, alkalimetal oxide, addition is 5～25% of ferro-silicon melt amount, and the time is 0.5～5h.
Above-mentioned blowing refining process and slag refining process can be carried out separately respectively, also can carry out simultaneously.
For the small particle size silicon ore producing in ferro-silicon and industrial silicon production process (particle diameter <20mm), first by granularity, carry out classification, small particle size silicon ore particle diameter is 5mm when following, can directly as raw material, smelt in the method; When small particle size silicon ore particle diameter is between 5～20mm, must be below 5mm through being crushed to particle diameter, could as raw material, smelt in the method.
The invention has the beneficial effects as follows: (1) the present invention has proposed a kind of method of utilizing SILICA FUME and small-particle silica to produce ferro-silicon on the basis that does not change existing ferro-silicon production smelting equipment and operating duty; (2) take SILICA FUME and small-particle silica is raw material, usings coal tar, coal-tar pitch and composition thereof etc. as binding agent production SILICA FUME pelletizing, meets ferro-silicon to produce into stove requirement; (3) take SILICA FUME and small-particle silica as raw material production ferro-silicon, reduced the silica consumption of ferro-silicon in producing, improved Business Economic Benefit, solved iron alloy produce in SILICA FUME and small-particle silica store up in a large number the environmental problem of bringing.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1
As shown in Figure 1, this utilizes SILICA FUME to produce the method for ferro-silicon, and its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 2% and the water of SILICA FUME quality 3% to mix in SILICA FUME and small-particle silica, under the pressure of 5t, be pressed into pelletizing, wherein SiO in SILICA FUME
2content 90.4wt.%, Al
2o
3content 1.2wt.%, small-particle silica particle diameter is below 5mm, and add-on is 40% of SILICA FUME quality, and binding agent is coal tar, and pelletizing particle diameter is 25mm;
(2) under reducing atmosphere, the pelletizing that step (1) obtains is under the condition of 100 ℃ after dry 6h in temperature, it is in the metallurgical furnace of 800 ℃ that the dried pelletizing that is 2.4:1.0 by mass ratio and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 0.5h under 1800 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt, wherein carbonaceous reducing agent is coke, metallurgical furnace is mineral hot furnace, steel cuttings, the addition of steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
Above-mentioned external refining process is for removing impurity element by air blowing technique means, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009.
Air blowing process is: in ferro-silicon melt, be blown into a certain amount of oxygen-rich air, and metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, blow gas pressure is 2atm, flow is 0.1hm
3/ min, the time is 0.5h.
This ferro-silicon product composition is Si content 77.4wt.%, Al content 0.4wt.%, and Ca content 0.4wt.%, Mn content 0.6wt.%, Cr content 0.4wt.%, surplus is Fe.
Embodiment 2
As shown in Figure 1, this utilizes SILICA FUME to produce the method for ferro-silicon, and its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 12% and the water of SILICA FUME quality 15% to mix in SILICA FUME and small-particle silica, under the pressure of 30t, be pressed into pelletizing, wherein SiO in SILICA FUME
2content 88.5wt.%, Al
2o
3content is less than 1.4wt.%, and small-particle silica particle diameter is below 5mm, and add-on is below 50% of SILICA FUME quality, and binding agent is that mass ratio is coal-tar pitch and the wood fibre of 1:1, and pelletizing particle diameter is 150mm;
(2) under reducing atmosphere, the pelletizing that step (1) obtains is under the condition of 300 ℃ after dry 0.5h in temperature, it is in the metallurgical furnace of 1200 ℃ that the dried pelletizing that is 3.0:2.0 by mass ratio and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 2h under 2500 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt, wherein carbonaceous reducing agent is charcoal, metallurgical furnace is mineral hot furnace, steel cuttings, the addition of steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
Above-mentioned external refining process is for removing impurity element to obtain the ferro-silicon product that meets standard GB/T/T2272-2009 by technique means such as air blowing, slag making.
Air blowing process is: toward being blown into a certain amount of volume ratio in ferro-silicon melt, be the oxygen of 1:1 and the mixed gas of oxygen-rich air, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, blow gas pressure is 8atm, and flow is 1hm
3/ min, the time is 5h.
Slagging process is: in ferro-silicon melt, add a certain amount of synthetic slag, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, the composition of synthetic slag comprises unslaked lime, addition is 5% of ferro-silicon melt amount, and the time is 0.5h.
This ferro-silicon product composition is Si content 73.5wt.%, Al content 0.6wt.%, and Ca content 0.7wt.%, Mn content 0.4wt.%, Cr content 0.2wt.%, surplus is Fe.
Embodiment 3
As shown in Figure 1, this utilizes SILICA FUME to produce the method for ferro-silicon, and its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 8% and the water of SILICA FUME quality 10% to mix in SILICA FUME and small-particle silica, under the pressure of 15t, be pressed into pelletizing, wherein SiO in SILICA FUME
2content 86.3wt.%, Al
2o
3content 1.2wt.%, small-particle silica particle diameter is below 5mm, and add-on is 48% of SILICA FUME quality, and binding agent is coal tar, and pelletizing particle diameter is 100mm;
(2) under reducing atmosphere, the pelletizing that step (1) obtains is under the condition of 150 ℃ after dry 4h in temperature, it is in the metallurgical furnace of 900 ℃ that the dried pelletizing that is 2.5:1.5 by mass ratio and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 1.2h under 2000 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt, wherein carbonaceous reducing agent is coal, metallurgical furnace is mineral hot furnace, steel cuttings, the addition of steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
Above-mentioned external refining process is for removing impurity element to obtain the ferro-silicon product that meets standard GB/T/T2272-2009 by technique means such as air blowing, slag making.
Air blowing process is: in ferro-silicon melt, be blown into a certain amount of chlorine, and metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, blow gas pressure is 6atm, flow is 0.8hm
3/ min, the time is 3h.
Slagging process is: in ferro-silicon melt, add a certain amount of synthetic slag, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, the composition of synthetic slag comprises quartz sand and fluorite, addition is 25% of ferro-silicon melt amount, and the time is 5h.
This ferro-silicon product composition is Si content 91.2wt.%, Al content 0.3wt.%, and Ca content 0.7wt.%, Mn content 0.2wt.%, Cr content 0.1wt.%, surplus is Fe.
Embodiment 4
As shown in Figure 1, this utilizes SILICA FUME to produce the method for ferro-silicon, and its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 9% and the water of SILICA FUME quality 8% to mix in SILICA FUME and small-particle silica, under the pressure of 18t, be pressed into pelletizing, wherein SiO in SILICA FUME
2content 94.6wt.%, Al
2o
3content 0.8wt.%, small-particle silica particle diameter is below 5mm, and add-on is 48% of SILICA FUME quality, and binding agent is coal tar, and pelletizing particle diameter is 115mm;
(2) under reducing atmosphere, the pelletizing that step (1) obtains is under the condition of 180 ℃ after dry 4h in temperature, it is in the metallurgical furnace of 900 ℃ that the dried pelletizing that is 2.8:1.2 by mass ratio and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 1.5h under 2200 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt, wherein carbonaceous reducing agent is refinery coke, metallurgical furnace is mineral hot furnace, steel cuttings, the addition of steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
Above-mentioned external refining process is for removing impurity element to obtain the ferro-silicon product that meets standard GB/T/T2272-2009 by technique means such as air blowing, slag making.
Air blowing process is: in ferro-silicon melt, be blown into a certain amount of chlorine, and metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, blow gas pressure is 6atm, flow is 0.8hm
3/ min, the time is 2.5h.
Slagging process is: in ferro-silicon melt, add a certain amount of synthetic slag, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, the composition of synthetic slag comprises iron phosphorus and alkalimetal oxide, addition is 15% of ferro-silicon melt amount, and the time is 2.5h.
This ferro-silicon product composition is Si content 92.2wt.%, Al content 0.7wt.%, and Ca content 0.3wt.%, Mn content 0.2wt.%, Cr content 0.1wt.%, surplus is Fe.
Embodiment 5
As shown in Figure 1, this utilizes SILICA FUME to produce the method for ferro-silicon, and its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 7% and the water of SILICA FUME quality 13% to mix in SILICA FUME and small-particle silica, under the pressure of 28t, be pressed into pelletizing, wherein SiO in SILICA FUME
2content 82.6wt.%, Al
2o
3content 1.8wt.%, small-particle silica particle diameter is below 5mm, and add-on is 30% of SILICA FUME quality, and binding agent is wood fibre, and pelletizing particle diameter is 85mm;
(2) under reducing atmosphere, the pelletizing that step (1) obtains is under the condition of 160 ℃ after dry 5.5h in temperature, it is in the metallurgical furnace of 1100 ℃ that the dried pelletizing that is 2.7:1.0 by mass ratio and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 1.8h under 1900 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt, wherein carbonaceous reducing agent is biomass, metallurgical furnace is mineral hot furnace, steel cuttings, the addition of steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
Above-mentioned external refining process is for removing impurity element to obtain the ferro-silicon product that meets standard GB/T/T2272-2009 by slag making technique means.
Slagging process is: in ferro-silicon melt, add a certain amount of synthetic slag, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, the composition of synthetic slag is unslaked lime, quartz sand and alkalimetal oxide, addition is 22% of ferro-silicon melt amount, and the time is 3h.
This ferro-silicon product composition is Si content 78.5wt.%, Al content 0.4wt.%, and Ca content 0.7wt.%, Mn content 0.3wt.%, Cr content 0.2wt.%, surplus is Fe.
Embodiment 6
As shown in Figure 1, this utilizes SILICA FUME to produce the method for ferro-silicon, and its concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 8% and the water of SILICA FUME quality 15% to mix in SILICA FUME and small-particle silica, under the pressure of 28t, be pressed into pelletizing, wherein SiO in SILICA FUME
2content 83.6wt.%, Al
2o
3content 1.7wt.%, small-particle silica particle diameter is below 5mm, and add-on is 20% of SILICA FUME quality, and binding agent is coal tar, and pelletizing particle diameter is 55mm;
(2) under reducing atmosphere, the pelletizing that step (1) obtains is under the condition of 280 ℃ after dry 0.5h in temperature, it is in the metallurgical furnace of 1000 ℃ that the dried pelletizing that is 2.4:1.0 by mass ratio and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 1.6h under 1900 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt, wherein carbonaceous reducing agent is biomass charcoal, metallurgical furnace is mineral hot furnace, steel cuttings, the addition of steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
Above-mentioned external refining process is for removing impurity element to obtain the ferro-silicon product that meets standard GB/T/T2272-2009 by technique means such as air blowing, slag making.
Air blowing process is: in ferro-silicon melt, be blown into a certain amount of oxygen, and metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, blow gas pressure is 8atm, flow is 1hm
3/ min, the time is 5h.
Slagging process is: in ferro-silicon melt, add a certain amount of synthetic slag, metal or the nonmetallic impuritys such as Al, the Ca in removal ferro-silicon, C, S, Ti, P, Mn, Cr, Mg, Cu, V, Ni, the composition of synthetic slag comprises alkalimetal oxide, addition is 10% of ferro-silicon melt amount, and the time is 3h.
This ferro-silicon product composition is Si content 78.2wt.%, Al content 0.3wt.%, and Ca content 0.4wt.%, Mn content 0.4wt.%, Cr content 0.2wt.%, surplus is Fe.
Claims (8)
1. utilize SILICA FUME to produce a method for ferro-silicon, it is characterized in that concrete steps are as follows:
(1) first to after adding the binding agent of SILICA FUME quality 2～12% and the water of SILICA FUME quality 3～15% to mix in SILICA FUME and small-particle silica, under the pressure of 5～30t, be pressed into pelletizing;
(2) under reducing atmosphere, the pelletizing that step (1) obtains in temperature, be dry under the condition of 100～300 ℃ after, by mass ratio, be (2.4～3.0): it is in the metallurgical furnace of 800～1200 ℃ that the dried pelletizing of (1.0～2.0) and carbonaceous reducing agent pack surface temperature into, pelletizing and carbonaceous reducing agent complete preroasting the decline process that arrives high-temperature area from metallurgical furnace fire door, then pelletizing and carbonaceous reducing agent are to smelt 0.5～2h under 1800～2500 ℃ of conditions at metallurgical furnace high temperature regional temperature, in smelting process, add steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material obtain ferro-silicon melt,
(3) the ferro-silicon melt that step (2) obtains can be produced and obtain ferro-silicon after external refining.
2. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1, is characterized in that: SiO in described SILICA FUME
2content is greater than 80wt.%, Al
2o
3content is less than 2wt.%.
3. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1 and 2, is characterized in that: described small-particle silica particle diameter is below 5mm, and add-on is below 50% of SILICA FUME quality.
4. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1 and 2, is characterized in that: described binding agent is one or more the arbitrary proportion mixtures in coal tar, coal-tar pitch, wood fibre.
5. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1 and 2, is characterized in that: the pelletizing particle diameter that described step (1) obtains is 25～150mm.
6. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1 and 2, is characterized in that: described carbonaceous reducing agent is coke, charcoal, coal, refinery coke, biomass or biomass charcoal.
7. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1 and 2, is characterized in that: described metallurgical furnace is mineral hot furnace.
8. the method for utilizing SILICA FUME to produce ferro-silicon according to claim 1 and 2, it is characterized in that: the addition of described steel cuttings, steel rolling iron sheet and iron ore pellets iron-bearing material is according to product requirement adjustment, to obtain the ferro-silicon product that meets standard GB/T/T2272-2009.
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