CN1485448A - Steelmaking process utilizing electric arc furnace to reclaim and recycle powdery industrial waste - Google Patents
Steelmaking process utilizing electric arc furnace to reclaim and recycle powdery industrial waste Download PDFInfo
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- CN1485448A CN1485448A CNA021442169A CN02144216A CN1485448A CN 1485448 A CN1485448 A CN 1485448A CN A021442169 A CNA021442169 A CN A021442169A CN 02144216 A CN02144216 A CN 02144216A CN 1485448 A CN1485448 A CN 1485448A
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Abstract
A steel-making method of recycling powdery industrial wastes by arc furnaces. It comprises: powdery industrial wastes containing components necessary for steel-making are added into arc furnaces, melt and mixed with molten steel, which will be the source for a part of the raw material for steel-making. By melting at high temperature, pollutants in the powdery industrial wastes would be removed. Slag could be recycled.
Description
Technical field
The present invention relates to a kind of method for making steel that utilizes electric arc furnace, particularly a kind of method for making steel that utilizes electric arc furnace with the recycling of powdery trade waste.
Background technology
So-called powdery trade waste is made a general reference in industrial production, and the dust waste that is produced can be divided into the dust-collector that floats and get via the dust-collecting equipment collection, and the bottom ash that sinks etc.And the dust-collector source mainly is to come from iron and steel industry, non-ferrous metal smelting industry, refuse incinerator, Cement industry, Pulp industry etc. at present.Bottom ash then mainly comes from refuse incinerator, boiler etc.And detect via the toxicity dissolution test for these powdery trade wastes, can be divided into general industry waste and noxious industry waste two classes.Wherein, for general industry waste person, for example, coal ash, bagasse cigarette ashes etc. can be sent outside and directly bury or directly recycling.And for noxious industry waste person, garbage incineration fly ash etc. for example, for meeting innoxious treatment principle, major part all is that the mode of burying disposal after taking to entrust the cleaning industry via suitable solidification treatment is again handled at present.
Yet, owing to bury land used and obtain difficult, and general garbage incineration fly ash (containing the reaction ash) is to belong to contain the harmful heavy metal composition, and the noxious industry waste of organic pollution materials, therefore, heavy metal in the garbage incineration fly ash cured article and organic pollutant still have the possibility of stripping, if buried land used to stop that shielding device is provided with bad, then cause the secondary public hazards easily.
Therefore, emphasizing that land use and waste material turn to today of target, for handling the huge powdery noxious industry wastes such as garbage incineration fly ash of output, must seek the exploitation that diversification utilizes treatment technology again, reaching innoxious, to reduce volume, and the treatment principle of resource recycling.
Summary of the invention
The object of the present invention is to provide a kind of energy will contain the powdery trade waste of the composition of steelmaking feed, under the high-temperature fusion environment of electric arc furnace, part source as steelmaking feed, and the pollutent in this powdery trade waste can be destroyed removal, and under the condition that does not influence electric-arc furnace steelmaking quality and output, can this powdery trade waste of efficient recovery and give resource utilization and utilize again, and can reduce steel-making cost utilize the method for making steel of electric arc furnace with the recycling of powdery trade waste.
The invention provides a kind of method for making steel that utilizes electric arc furnace with the recycling of powdery trade waste, it is characterized in that it includes an addition step, an electric arc furnace fusion step, waste interpolation step, an electric arc furnace oxidation step, an electric arc furnace reduction step and a tapping step.This addition step is that the furnace roof of steelmaking feed from this electric arc furnace is added in this electric arc furnace.This electric arc furnace fusion step is by a High Voltage Power Supply system, produces high-temperature electric arc in stove, makes steelmaking feed be melt into liquid molten steel.It is make steel the powdery trade waste of required composition and be added in this electric arc furnace containing that this waste adds step, melts with above-mentioned liquid steel aqueous fusion simultaneously and mixes, and originates in order to the part that is made for the steel-making desired raw material.This electric arc furnace oxidation step is under the continuous high temperature effect, and impurity contained in the described liquid molten steel can be oxidized to the solid oxide slag, the then destroyed removal of the pollution substance in the described powdery trade waste.This electric arc furnace reduction step is to relend the composition that is contained by in the described powdery trade waste, with the residual oxide reaction in the described liquid molten steel, so that described liquid molten steel reaches clean state.This tapping step is that the liquid molten steel that is clean state is poured in the steel teeming ladle.
Description of drawings
Fig. 1 is a schema, illustrates that the present invention utilizes the preferred embodiment of electric arc furnace with the method for making steel of powdery trade waste recycling.
Fig. 2 is a flow process explanatory view of this preferred embodiment.
Embodiment
Other features and advantages of the present invention in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly be understood.
As shown in Figure 1, 2, for the present invention utilizes the preferred embodiment of electric arc furnace with the method for making steel of powdery trade waste recycling, general electric arc furnace mainly is by a resistant to elevated temperatures body of heater, a portable bell, and is inserted on this bell more than one and feeds the intravital artificial graphite electrode of this stove and form.And this preferred embodiment includes an addition step 1, an electric arc furnace fusion step 2, waste interpolation step 3, an electric arc furnace oxidation step 4, an electric arc furnace reduction step 5, a tapping step 6, a refinement step 7 and a continuous casting forming step 8 in regular turn.
In this addition step 1, earlier steelmaking feed is added in this body of heater with the furnace roof of top filling mode from this electric arc furnace.And this steelmaking feed is with general scrap iron among the people, automobile scrap iron, scrap iron briquetting, and the scrapping scrap iron is main.
In this electric arc furnace fusion step 2, by a High Voltage Power Supply system, high-tension current is fed this artificial graphite electrode and produces electric arc, and arc temperature is up to about 3000 ℃, whereby high temperature and scrap iron material fusion the becoming liquid steel water in the stove.Then, add in step 3, will contain again and make steel the powdery trade waste of required composition and be added in this electric arc furnace, melt with above-mentioned this liquid steel aqueous fusion simultaneously and mix, originate in order to the part that is made for the steel-making desired raw material at this waste.And the powdery trade waste in the present embodiment is to be garbage incineration fly ash (containing the reaction ash), and this garbage incineration fly ash contains the lime material of the 40～60wt% that has an appointment in (containing the reaction ash), and heavy metal composition (for example: iron, manganese etc.).Because, in electric-arc furnace steelmaking is produced, can add the coke and the lime material (for example: Wingdale, unslaked lime etc.) of suitable proportion scale usually.So, utilize the large quantities of lime material that is contained in this powdery trade waste, just can be used as the source that replaces the unslaked lime/lime in the steelmaking feed, and effectively reduce the required batching cost of steel-making.
In the present embodiment, the part by weight of this steelmaking feed and this powdery trade waste is to be 90: 3～4.This steelmaking feed is divided into three to four interpolations, that is to say, when feeding in raw material operation for the first time, earlier steelmaking feed is partly added in the stove of this electric arc furnace, and after this steelmaking feed is melt into liquid molten steel, carry out this waste again and add step 2, and this powdery trade waste partly is added in the stove to scale, and the powdery trade waste is merged in this liquid state molten steel fully.Afterwards, the rest may be inferred adds actions such as the steelmaking feed of part and corresponding powdery trade waste enter in the stove more in regular turn and heavily covers three to four inferiorly, makes it be melt into liquid molten steel fully.In order to guarantee that this powdery trade waste can be blended in the liquid molten steel of pyritous equably.
Then, in this electric arc furnace oxidation step 4, under the continuous high temperature effect, contained impurity (for example: ferric oxide, manganese oxide, zinc oxide, silicon can be oxidized to gaseous oxidation thing (for example: carbon monoxide, carbonic acid gas etc.), saccharoid in this liquid state molten steel, and other heavy metals become to grade), and solid oxide slag (main component is calcium oxide, magnesium oxide, ferric oxide, silicon-dioxide etc.).And gaseous oxidation thing that is produced and saccharoid can give collection and treatment via dust-collecting equipment (for example, bag filter formula particle collector).And under high temperature fused state, the organic pollution materials in this powdery trade waste (for example: dioxin and furans) then can be destroyed effectively and be removed, and reaches good pollutant removal effect.
And in this electric arc furnace reduction step 5, because in the general STEELMAKING PRODUCTION, behind this electric arc furnace oxidation step 4, can be added into some coke, lime material or sweetening agent etc. again, carry out reduction reaction with the oxide compound in this liquid state molten steel, produce scum silica frost and deoxidation desulfurization, to purify this liquid state molten steel.So the lime material of a large amount that is contained in this powdery trade waste just can be used as the source that replaces the lime material of general required interpolation in this electric arc furnace reduction step 5, and saves the cost of steel-making batching.
Then, in this tapping step 6, should pour in the steel teeming ladle by the liquid state molten steel, at this moment, the temperature of this liquid state molten steel reaches between 1580 ℃～1630 ℃ approximately.So, the a large amount lime material that this powdery trade waste in this liquid state molten steel is contained, just can replace source, make in this electric arc furnace oxidation step 4 and the electric arc furnace reduction step 5, not need additionally to be added into again the lime material as the lime material in this steel-making material.And, by extracting metal ingredients such as manganese in this powdery trade waste, iron, and help to reduce the consumption of the alloy iron in this steel-making material.Therefore, making lime material in this powdery trade waste and metal ingredient can give efficient recovery utilizes again.
So after tapping step 6 was finished, basic enforcement aspect of the present invention just declared to be finished.Later then be the present invention to be finished the liquid molten steel of tapping after the step 6 remake follow-up refinery process.
Then, continue again and carry out refinement step 7, the molten steel of inside that is loaded with the steel teeming ladle of this liquid state molten steel is poured in the refining furnace, carry out refining.Simultaneously, and be added into the refining material, adapting to the specification demand of different steel product, and improve the purity of liquid molten steel.This refining material is for being selected from the following group that constitutes: ferrosilicon, ferromanganese, ferro-silico-manganese, sweetening agent, and the combination of above-mentioned materials.Because in the general refining process, can be added into coke and lime material again, in order to remove objectionable impurities and the nonmetal intermediate product that exists in this liquid state molten steel, and formation solid state reduction slag, make liquid molten steel can reach more clean state, and be smelt high-quality killed steel, make the steel billet that is smelt can bring into play the best function of its materialization and mechanical properties.
At last, in this continuous casting forming step 8, the liquid molten steel of the high cleaning that these refinement step 7 backs are obtained carries out the casting program again, or inserts and carry out the continuous casting program in the continuous casting machine, just can finish the making of a steel billet.
And utilize the method for making steel of electric arc furnace with the recycling of powdery trade waste by the present invention, and made respectively SD420, the steel billet of SD280 steel grade and the reinforcing bar of making, its chemical ingredients and physical properties all meet the reinforcing bar national standard of Steel Concrete.Therefore, proved by the interpolation of this powdery trade waste (garbage incineration fly ash), the output that does not influence electric-arc furnace steelmaking with and the billet quality made.
On the other hand, in whole steel-making course of the electric arc furnace and refining process, the main ash composition of other of this powdery trade waste then can be discharged along with the slag that is produced (comprising solid oxide slag and solid state reduction slag).And the toxicity stripping concentration test (TCLP toxicity dissolution test) that the slag that is produced carries out heavy metals such as lead, chromium, cadmium, mercury is detected, found that, each heavy metal concentration of this slag does not all exceed existing stripping toxicity criterion, so, to belong to the general industry waste, and can give directly utilizing again, and can not produce the secondary public hazards.
In sum, the present invention utilizes the method for making steel of electric arc furnace with the recycling of powdery trade waste, to contain and make steel the powdery trade waste of required composition and add in the electric arc furnace,, and reduce the steel-making material cost as the part material source of steel-making desired raw material.And borrow the high-temperature fusion environment, and be able to the pollutent in the powdery trade waste is destroyed removal, and effectively reduce the extra process cost and the risk of powdery trade waste.Therefore, guaranteeing the steel billet quality and the output of electric-arc furnace steelmaking, and do not produce under the situation of secondary public hazards, the powdery trade waste can be utilized by efficient recovery again, waste subtracts appearance, nothing poisons and the purpose of resource utilization and reach, and reduce multiple environmental benefit such as steel-making material cost, so can reach the purpose of invention really.
Claims (5)
1. method for making steel that utilizes electric arc furnace with the recycling of powdery trade waste is characterized in that it comprises:
One addition step is added into the furnace roof of steelmaking feed from this electric arc furnace in this electric arc furnace;
One electric arc furnace fusion step by a High Voltage Power Supply system, produces high-temperature electric arc in stove, make steelmaking feed be melt into liquid molten steel;
One waste adds step, will contain make steel the powdery trade waste of required composition and be added in the electric arc furnace, melts with above-mentioned liquid steel aqueous fusion simultaneously and mixes, and originates in order to the part that is made for the steel-making desired raw material;
One electric arc furnace oxidation step, under the continuous high temperature effect, impurity contained in the described liquid molten steel can be oxidized to the solid oxide slag, the then destroyed removal of the pollution substance in the described powdery trade waste;
One electric arc furnace reduction step relends the composition that is contained by in the described powdery trade waste, with the residual oxide reaction in the described liquid molten steel, so that described liquid molten steel reaches clean state; And
One tapping step is poured the liquid molten steel that is clean state in one steel teeming ladle into.
2. utilize the method for making steel of electric arc furnace according to claim 1, it is characterized in that the recycling of powdery trade waste:
Also comprise a refinement step, in the step of should tapping, the liquid molten steel of inside that is loaded with the steel teeming ladle of liquid molten steel is poured into and is carried out refining in the refining furnace, and be added into the refining material and reacted and form the solid state reduction slag, to improve the purity of described liquid molten steel, also comprise a continuous casting forming step, above-mentioned liquid molten steel is carried out the continuous casting program, just can finish the making of a steel billet.
3. as described in claim 2, utilize the method for making steel of electric arc furnace, it is characterized in that the recycling of powdery trade waste:
Refining material in the described refinement step, for being selected from the following group that constitutes: ferrosilicon, ferromanganese, ferro-silico-manganese, sweetening agent, and the combination of above-mentioned materials, in order to adapting to the product specification requirement, and improve the purity of liquid molten steel.
4. utilize the method for making steel of electric arc furnace according to claim 1, it is characterized in that the recycling of powdery trade waste:
Described waste adds in the step, and described powdery trade waste contains the large quantities of lime material, in order to the batching source of carrying out oxidation or reduction reaction in described electric arc furnace oxidation step and the described electric arc furnace reduction step to be provided.
5. as described in claim 2, utilize the method for making steel of electric arc furnace, it is characterized in that the recycling of powdery trade waste:
Described waste adds in the step, and described powdery trade waste contains metal ingredient, can add the part of refining material in order to the institute that requires as the adaptation product specification in this refinement step and originate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021442169A CN1485448A (en) | 2002-09-29 | 2002-09-29 | Steelmaking process utilizing electric arc furnace to reclaim and recycle powdery industrial waste |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA021442169A CN1485448A (en) | 2002-09-29 | 2002-09-29 | Steelmaking process utilizing electric arc furnace to reclaim and recycle powdery industrial waste |
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| CN1485448A true CN1485448A (en) | 2004-03-31 |
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| CNA021442169A Pending CN1485448A (en) | 2002-09-29 | 2002-09-29 | Steelmaking process utilizing electric arc furnace to reclaim and recycle powdery industrial waste |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138887A (en) * | 2014-07-24 | 2014-11-12 | 北方民族大学 | Method for curing chrome in fouling acid slag |
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2002
- 2002-09-29 CN CNA021442169A patent/CN1485448A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104138887A (en) * | 2014-07-24 | 2014-11-12 | 北方民族大学 | Method for curing chrome in fouling acid slag |
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