CN101921883A - Composite fluorine-free slag modifier - Google Patents
Composite fluorine-free slag modifier Download PDFInfo
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- CN101921883A CN101921883A CN2010102783012A CN201010278301A CN101921883A CN 101921883 A CN101921883 A CN 101921883A CN 2010102783012 A CN2010102783012 A CN 2010102783012A CN 201010278301 A CN201010278301 A CN 201010278301A CN 101921883 A CN101921883 A CN 101921883A
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- fluorine
- slag
- parts
- slag modifier
- free slag
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Abstract
The invention relates to a composite fluorine-free slag modifier, which comprises the following chemical components in parts by weight: 8 to 24 parts of SiO2, 4 to 14 parts of CaO, 20 to 28 parts of Al2O3, 20 to 30 parts of Fe2O3, 3 to 6 parts of MgO, and 3 to 8 parts of MnO. The composite fluorine-free slag modifier can effectively improve the viscosity of slag, ensure excellent permeability of a stock column and activate a hearth to ensure good slag-iron separation, can reinforce the melting process without corroding lining and equipment, ensures performance of various reducing reactions, avoids occurrence of various unexceptional situations, provides guarantee for normal operation of a blast furnace, and provides a new way for fluorine pollution.
Description
Technical field
The invention belongs to the metallurgical material technical field, relate to a kind of composite fluorine-free slag modifier that blast furnace uses that is adapted to.
Background technology
Make a general survey of human course of passing by with social environment; make people understand the care of human needs's environment; environment needs the mankind to go protection; only in this way; human and environment just can be got along amiably and peacefully; natural disaster and chemical pollution just can alleviate, the human health that could live, happy, peaceful, the sustainable development steadily of economic ability.
The performance of fluorochemical: fluorine belongs to haloid element in the periodic table of elements, fluorine is again the strongest element of nonmetal character in the haloid element, and it belongs to the diatomic non-polar molecule, belongs to molecular crystal when solid-state, with more weak London force combination, so fusing point, boiling point are not high.It is very strong to get electronic capability, belongs to strong oxidizer.Fluorine also is the strongest oxygenant in the aqueous solution.Fluorine is the atomic radius minimum in halogen, the element of electronegativity maximum.Compare with other halogen, fluorine and oxygen reaction are the fiercest, and the hydrogen fluoride of generation is the most stable, when halogen participates in reaction, can relate to the disassociation of molecule, and the bond energy of fluorine molecule is less, help reaction and carry out.Fluorine almost can with the direct chemical combination of all metals.Fluorine mainly exists with mineral forms such as fluorite and sodium aluminum fluorides at nature.At the catalyzer of special industry halogenation fluorine as manufacturing enriched uranium (EU), the ignition dope of rocket fuel.Fluorite is made antiscales at blast furnace ironmaking, makes fusing assistant in Steel industry.The compound of fluorine is high toxicity and strong reactivity element, and all biologies are had fatal toxicity.Can cause coagulation necrosis with skin contact, even light concentration gas also can cause pathology, maximum permissible concentration is at 0.15-0.2mg/m in the air
3The World Health Organization requires to use the environment of fluorochemical that the specific safety measure must be arranged.Reduce discharging energy-conservationly, environment purification improves level of human health, and is imperative for this reason.
The effect of fluorochemical and harm: fluorochemical mainly plays the effect of regulating its high-temperature physical property in steelmaking ingredient.This element in use.Except causing the pollution of topsoil and water, also can etching apparatus.Along with the strict demand of environmental protection, metallurgy industry is sought floride-free fusing assistant, and it is extremely urgent to solve fluoride pollution.
Show metallurgical on-the-spot the actual measurement according to national environmental protection department,, volatilize a large amount of toxic gases, i.e. HF, NaF, SiF around the steelworks, continuous caster at iron work with mass spectrograph
4, ALF
3Deng.Bring the serious environmental pollution to the operator.The HF solution energy heavy corrosion mechanical means that fluorine forms in water coolant, acceleration equipment is aging, and the fluorine content through measuring in continuous casting two cold waste water reaches 80mg/L unexpectedly.Other water coolant also all seriously surpasses discharging standards.
The performance of fluorite and effect: fluorite is a kind of natural halogen compounds of calcium.It is ferrous metallurgy neutral flux commonly used.The main fluxing action that rises.The chemical ingredients of fluorite is CaF
2, Chang Xianzi, green, white and faint yellow.Belong to cubic system, have vitreous luster, be clear to translucent.Hardness 4, density 3.1-3.2.Property is crisp.Fusing point is greatly about 930 ℃.It can make the fusing point of CaO and obstruction lime dissolved Dicalcium Phosphate (Feed Grade) shell significantly reduce, thereby quickens the lime fusion, improves the flowability of slag rapidly, and its advantage is that effect is fast, the time weak point.Its shortcoming is a contaminate environment, corrodes facility, and the reaction equation in slag is:
4CaF
2+2SiO
2==4CaO+2SiF
4↑
3CaF
2+ S ==?3Ca?+?SF
6?↑
The fluorine of fluorite behind pyrolytic decomposition can generate sulfur fluoride with the sulphur effect, with SiO
2Effect generates SiF
4, these two kinds of elements scatter and disappear with coal gas.It is not only to the refractory corrosion severity of blast furnace hearth top and belly.And it is also very serious to the corrosion of blast furnace, factory building.As follows with the reaction of ceramic refractory:
4CaF
2+2SiO
2==4CaO+2SiF
4↑
3CaF
2+Al
2O
3==3?CaO+2AlF
3
SiF
4With the water effect in the coal gas, generate the HF of vigorous erosion, its chemical equation is:
SiF
4+2H
2O==4HF+SiO
2
HF produces erosion action to quartz, mullite, corundum, thereby shortens the work-ing life of refractory materials and mechanical means, simultaneously the operator is also had bigger harm.
The performance of fluorine-containing slag: the advantage of fluorine-containing slag is good fluidity.Shortcoming is that refractory materialss such as the iron mouth mud cover and the stemming of blocking up are had the very strong agent of erosion and scouring force.This slag not only corrodes and washes away iron mouth passage in the process of tapping a blast furnace, and can not form after blocking up and stablize firm clay gun.Thereby make the work of iron mouth be in the vicious cycle state.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides and a kind ofly can effectively improve slag viscosity, guarantee the stock column air permeability and good, enliven cupola well, make slag iron separator well, both strengthening smelting technology, do not corrode furnace lining and equipment again, both guaranteed the carrying out of various reduction reactions, avoided the generation of various abnormal conditions again, the composite fluorine-free slag modifier of guarantee was provided for the normal operation of blast furnace.
The present invention solves the technological method that its technical problem adopts: a kind of composite fluorine-free slag modifier, its chemical composition and weight proportion are respectively: SiO
28-24, CaO4-14, Al
2O
320-28, Fe
2O
320-30, MgO3-6, MnO3-8.
The granularity of described composite fluorine-free slag modifier is 34x24x12 mm
3
The fusing point of described composite fluorine-free slag modifier≤1300 ℃.
A kind of manufacture method of composite fluorine-free slag modifier is with Fe
2O
3〉=30%, Al
2O
3〉=35% red bauxite is processed into 40-100 purpose particle, adds the optical calcite of CaO＞99% and the manganese ore of MnO 〉=20% again, and the back dry-pressing that stirs becomes the particle mm of 34x24x12
3Finished product.
The invention has the beneficial effects as follows: the present invention can effectively improve slag viscosity, guarantees the stock column air permeability and good, enlivens cupola well, makes slag iron separator well; It is strengthening smelting technology both, does not corrode furnace lining and equipment again; It had both guaranteed the carrying out of various reduction reactions, avoided the generation of various abnormal conditions again; For the normal operation of blast furnace provides guarantee, find a new way for solving fluoride pollution.
Description of drawings
Fig. 1 is a process block synoptic diagram of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples:
A kind of composite fluorine-free slag modifier, its chemical composition and weight proportion are respectively: SiO
28-24, CaO4-14, Al
2O
320-28, Fe
2O
320-30, MgO3-6, MnO3-8, the granularity of this composite fluorine-free slag modifier is 34x24x12 mm
3The fusing point of this composite fluorine-free slag modifier≤1300 ℃.
Referring to Fig. 1, a kind of manufacture method of composite fluorine-free slag modifier is through fragmentation and grinding, with Fe
2O
3〉=30%, Al
2O
3〉=35% red bauxite is processed into 40-100 purpose particle, adds the optical calcite of CaO＞99% and the manganese ore of MnO 〉=20% again and prepares burden, and the back dry-pressing that stirs becomes the particle mm of 34x24x12
3Moulding product through packing, detection and warehouse-in, dispatches from the factory then at last.
Composite fluorine-free slag modifier is a kind of neutral material, and its granularity is that the main component of this product of 34x24x12mm. is a ferro-aluminate, and it is the ideal product that replaces fluorite, both there be not environmental pollution, can increase output again, neither change the slag performance, have dilution again, change slag and fluxing action.Its principle of work is as follows:
1., when composite fluorine-free slag modifier runs into acid slag, can form silicate; When running into basic slag, can form aluminate; Do not change the performance of slag.
2., composite fluorine-free slag modifier contains Fe
2O
3Higher, in blast furnace, generated FeO by the reduction of the CO in coal gas back; FeO can reduce slag temperature of fusion and viscosity greatly, improves the flowability of slag, does not change the performance of slag, after the charcoal reduction can increase furnace processor.And the CaO that fluorite generates behind pyrolytic decomposition can change the performance of slag, increases slag viscosity, makes furnace temperature raise the slag retrogradation.The heavy-gravity slag can stop up the intergranular space of solid coke, worsen the ventilation property of stock column, hinder smooth operation of furnace, can cause the not smooth or hanging of the working of a furnace operation when serious, even cause dross, thicken furnace wall, burn out air port and cinder notch, it is bad to cause slag iron to separate, and band iron is serious, directly influences the output of blast furnace.
3. composite fluorine-free slag modifier contains micro-high reactivity element, and it can effectively alleviate because of calcium oxide in the slag too high, causes the excessive liquid phase that causes slag can not be fused into homogeneous fully of dual alkalinity.Thereby the raising slag fluidity is avoided having some setbacks because of the slag thickness causes blast furnace production.
Composite fluorine-free slag modifier of the present invention can effectively improve slag viscosity, guarantees the stock column air permeability and good, enlivens cupola well, makes slag iron separator well.Both strengthening smelting technology did not corrode furnace lining and equipment again.Both guaranteed the carrying out of various reduction reactions, avoided the generation of various abnormal conditions again,, found a new way for solving fluoride pollution for the normal operation of blast furnace provides guarantee.
Claims (4)
1. a composite fluorine-free slag modifier is characterized in that chemical composition and weight proportion are respectively: SiO
28-24, CaO4-14, Al
2O
320-28, Fe
2O
320-30, MgO3-6, MnO3-8.
2. a kind of composite fluorine-free slag modifier as claimed in claim 1 is characterized in that: the granularity of described composite fluorine-free slag modifier is 34x24x12 mm
3
3. a kind of composite fluorine-free slag modifier as claimed in claim 1 or 2 is characterized in that: the fusing point of described composite fluorine-free slag modifier≤1300 ℃.
4. prepare the method for a kind of composite fluorine-free slag modifier as claimed in claim 1, it is characterized in that: Fe
2O
3〉=30%, Al
2O
3〉=35% red bauxite is processed into 40-100 purpose particle, adds the optical calcite of CaO＞99% and the manganese ore of MnO 〉=20% again, and the back dry-pressing that stirs becomes the particle mm of 34x24x12
3Finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102783012A CN101921883A (en) | 2010-09-10 | 2010-09-10 | Composite fluorine-free slag modifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102783012A CN101921883A (en) | 2010-09-10 | 2010-09-10 | Composite fluorine-free slag modifier |
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| Publication Number | Publication Date |
|---|---|
| CN101921883A true CN101921883A (en) | 2010-12-22 |
Family
ID=43337096
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639401A (en) * | 2013-12-16 | 2014-03-19 | 江苏大学 | Ladle slag removal agent, preparation method and use method |
| CN106755648A (en) * | 2016-11-17 | 2017-05-31 | 孙榕远 | A kind of fluorite frit and its production method and application method |
| CN113234887A (en) * | 2021-05-19 | 2021-08-10 | 攀钢集团研究院有限公司 | Slag regulating agent for washing furnace bottom and use method thereof |
-
2010
- 2010-09-10 CN CN2010102783012A patent/CN101921883A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639401A (en) * | 2013-12-16 | 2014-03-19 | 江苏大学 | Ladle slag removal agent, preparation method and use method |
| CN103639401B (en) * | 2013-12-16 | 2015-09-02 | 江苏大学 | A kind of ladle slag removal agent and preparation method and using method |
| CN106755648A (en) * | 2016-11-17 | 2017-05-31 | 孙榕远 | A kind of fluorite frit and its production method and application method |
| CN113234887A (en) * | 2021-05-19 | 2021-08-10 | 攀钢集团研究院有限公司 | Slag regulating agent for washing furnace bottom and use method thereof |
| CN113234887B (en) * | 2021-05-19 | 2022-03-22 | 攀钢集团研究院有限公司 | Slag regulating agent for washing furnace bottom and use method thereof |
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Open date: 20101222 |