CN108396110B - It is a kind of that mud is sunk as the converter slagging agent and preparation method of raw material using whirling well - Google Patents
It is a kind of that mud is sunk as the converter slagging agent and preparation method of raw material using whirling well Download PDFInfo
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- CN108396110B CN108396110B CN201710064763.6A CN201710064763A CN108396110B CN 108396110 B CN108396110 B CN 108396110B CN 201710064763 A CN201710064763 A CN 201710064763A CN 108396110 B CN108396110 B CN 108396110B
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- mud
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- whirling well
- binder
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
It is a kind of that mud is sunk as the converter slagging agent and preparation method of raw material, component using whirling well are as follows: whirling well magnetic separation object 70~80%, binder 8~15%, bentonite 10~20%；Whirling well magnetic separation object is irony oxide and fe, and binder is scrapped plastic products.Using magnetic plant by heavy mud irony oxide and fe select；The material magneticly elected is dried using slab waste heat；Blocking scrapped plastic products will be condensed after material drying and fusing to be crushed；In the ratio ingredient of 70~80wt% of material drying, 10~20wt% of bentonite, 8~15wt% of binder, and it is put into blender and adds water and stirs mixing；The material ball that diameter is 30~50mm is pressed by ball press；Point three phases carry out low-temperature bake to material ball, are down to room temperature after baking.The present invention utilizes steel mill's waste resource and slab waste heat, can accelerate converter slugging early period speed, increases molten steel recovery rate, reduces smelting cost, and realize the reasonable utilization of plastic living rubbish.
Description
Technical field
The invention belongs to steelmaking feed field, in particular to it is a kind of using whirling well sink mud as the converter slagging agent of raw material and its
Preparation method.
Background technique
With the high-efficiency reform of converter, it is desirable that the slag charges such as lime and dolomite that converter is added in Primary period can be
The clinker with certain fluidity and basicity is generated in short time.To reach this purpose, needs to add certain slagging agent and promote
Slag input material melts slagging.Past, the burn-off rate of clinker improved by the way that fluorite is added in each steel mill, but since fluorite is not only right
Environment has very big pollution, while can also have very strong corrosion function to the furnace lining of converter, and the cost for repairing resistance to material is caused to occupy height not
Under.With the enhancing of people's environmental consciousness and in order to utmostly reduce production cost, fluorite as slagging agent gradually by
It eliminates.Some producers begin to use red bauxite or bauxite as slagging agent, but in clinker alumina content increase to molten iron
The removal of middle phosphorus is unfavorable, is easy to cause oxygen rifle to glue rifle and petticoat pipe dross after a large amount of aluminium oxide is furthermore accumulated in clinker, increases
Subsequent operation intensity.From the point of view of slugging mechanism, it is the key that Fast Slag Melting that the iron oxide in slag, which can accelerate the dissolution of lime,
The iron oxide in initial stage slag can also be conducive to quickly remove the phosphorus in molten iron simultaneously, therefore with iron oxide iron as main component
Matter slagging agent is more satisfactory slagging agent.It is analyzed from the angle of resource reutilization, although there are a large amount of iron oxide in steel mill
Raw material such as bof sludge and steel rolling iron sheet are all fully used, but still have raw material of the part containing iron oxide such as continuous casting to revolve
Sufficient utilization is not yet received in the heavy mud of stream well deposition.
The patent of invention of Publication No. CN 1176311A discloses " a kind of ferric scale fluxing and dissolving agent and its manufacturer
Method " is made using the iron scale, converter mud and sodium silicate binder of steel rolling, although the slagging agent can rise well
It is acted on to slugging, but since granularity is very thin after the drying for converter mud, mouldability is bad in process, use process
Middle pulverization rate is higher, is lost seriously after converter is added with furnace gas.104232841 A of CN disclose " a kind of dephosphorization slagging agent and its
Preparation method " will lead to the acid in slagging agent since the iron oxide ingredient wherein contained derives from the crushed material of iron ore
Property substance, which increases, brings difficulty to the raising of converter slag-making basicity.CN 200610084905.7 provides " a kind of copper smelter slag
Novel slagging agent " is that slagging agent is made using the method for electric smelting in mixture that lime and Iron Ore Powder form, made of this method
Although uniformly, higher cost, application value is lower in the industrial production for slagging agent ingredient.
Continuous casting whirling well settled sludge is the iron scale generated in two cold cooling procedures by slab and covering slag solidification
The mixture of the slag crust composition formed afterwards, the compound containing a large amount of iron oxide and reduction slag fusing point, but iron oxide contains
Measure the more of no steel rolling iron sheet, along with contain sodium, fluorine plasma, therefore utilization the difficulty of continuous casting iron sheet than bof sludge with
Steel rolling iron sheet is big, is not effectively used, most of to be abandoned as industrial waste.In order to make this part waste resource
It is fully used, a kind of mud is sunk as the converter slagging agent and production method of raw material using whirling well to propose.
Summary of the invention
It is an object of the invention to make full use of the waste resource of steel mill and slab waste heat, accelerate the slugging speed of converter early period
Degree is conducive to dephosphorization of molten iron early period, increases molten steel recovery rate, reduces smelting cost, and realize the reasonable of the day refuses such as polybag
It utilizes.
For this purpose, technical solution adopted by the present invention is:
It is a kind of that mud is sunk as the converter slagging agent of raw material using whirling well, the converter slagging agent component wt% are as follows: whirling well magnetic
Select object 70~80%, binder 8~15%, bentonite 10~20%；Wherein, whirling well magnetic separation object is irony oxide and simple substance
Iron, two kinds of substance total contents of irony oxide and fe account for the 95% of magnetic separation object, remaining is impurity；Binder is used through broken
Scrapped plastic products.
It is a kind of that mud is sunk as the preparation method of the converter slagging agent of raw material, specific method and step using whirling well are as follows:
(1) mud that sinks is collected: being collected using grab bucket to the heavy mud for being deposited on whirling well bottom.
(2) sink mud magnetic separation: the heavy mud collected under whirling well contains a certain amount of containing alkali metal oxide and fluoride
Crystallizer protecting residue, this moieties can corrode converter lining after entering converter, therefore must removal.It is aoxidized according to containing alkali metal
The covering slag of object and fluoride does not have magnetism, and the iron scale and fe in heavy mud have very strong ferromagnetic spy
Point, using magnetic plant to heavy mud carry out magnetic separation, by heavy mud irony oxide and fe select.
(3) dry: the ferriferous oxide and fe material magneticly elected contains a large amount of water, needs to carry out at drying it
Reason.In order to reduce drying energy cost, continuous casting billet waste heat is recycled indirectly, therefore carry out to the material magneticly elected using slab waste heat
The material magneticly elected is placed on baking pallet by drying, the pallet equipped with material is then placed in temperature greater than 200 DEG C
High-temperature continuous casting blank above dried, its moisture content of the material requirement dried be lower than 1%.
(4) be crushed: material is broken: the material of drying being carried out break process, it is desirable that ratio of the material particular diameter in 2~10mm
It is 80%, the ratio less than 2mm is less than 5%, and the ratio greater than 10mm is less than 15%.
Waste plastic processing: scrapped plastic products are melted at a high temperature of 200~300 DEG C using the waste heat of slab, so
After be condensed into bulk, then be broken into the particle that partial size is 2~10mm for block is condensed.
(5) ingredient: in 70~80wt% of material drying, 10~20wt% of bentonite, 8~15wt% of binder ratio into
Row ingredient.
(6) it mixes: the material prepared being put into blender and is stirred mixing, add water during puddling into material,
Amount of water is the 5~10% of volume of material.
(7) material of mixing pressure ball: is pressed into the material ball that diameter is 30~50mm by ball press.
(8) low-temperature bake: in order to prevent during low-temperature bake, rupture dusting occurs for material ball, influences using quality, low
Temperature baking is divided into three phases progress: at a temperature of baking 5~8h of the first stage by material ball at 80~100 DEG C, by internal water
Divide slowly removal；Temperature is increased to 200~300 DEG C by second stage, toasts 1~3h；Temperature is increased to 400 by the phase III~
600 DEG C, toast 2~4h, the intensity of fortifier pellet.
(9) finished product is collected: good material ball temperature to be baked is cooled to room temperature, and slagging agent preparation is completed.
The converter slugging that the present invention is not yet received the reality made full use of and applies at present for the heavy mud of continuous casting whirling well
Deficiency existing for agent, propose it is a kind of mud is sunk as the converter slagging agent and production method of base-material using whirling well, therefore can obtain such as
It is lower the utility model has the advantages that
1, accelerate the slugging speed of converter early period, be conducive to dephosphorization of molten iron early period；
2, the irony fluxing agent being added is conducive to increase the recovery rate of molten steel, reduces steel-making cost；
3, the waste resource of steel mill and slab waste heat can be made full use of, deeply taping the latent power reduces the latent of production cost
Power；
4, the day refuses such as partly plastic rubbish especially polybag in life can rationally be utilized, reduces environment
Pollution and processing workload.
Detailed description of the invention
Fig. 1 is converter slagging agent preparation process flow block diagram.
Specific embodiment
Embodiment 1:
Sink mud as the converter slagging agent component wt% of base-material using whirling well are as follows: whirling well magnetic separation object 70%, binder 10%,
Bentonite 20%, irony oxide and fe total content account for the 95% of magnetic separation object, and binder is used through broken waste plastic
Product.Slagging agent preparation process flow is as shown in Figure 1, specific preparation method and step are as follows:
First the grab bucket of the heavy mud in whirling well is collected, is selected irony oxide and fe by the method for magnetic separation,
It will select after material is put into pallet, and pallet is placed on two cold houses export to primary fire and cut this some fragment position temperature and be
The top of 250 DEG C of high-temperature continuous casting blank conveying section is to its drying and processing.The material of drying is broken into 2~10mm's of partial size later
Ratio is 80%, and the ratio less than 2mm is 4%, the particle that the ratio greater than 10mm is 16%.It will be used simultaneously as binder
Scrapped plastic products at a high temperature of 250 DEG C melt processed, heat needed for fusion process uses the waste heat of slab, then cold
Bulk is congealed into, block will be condensed later and be broken into the particle that partial size is 4mm.80% is accounted for material drying again, bentonite accounts for 12%, glues
The mass percent that knot agent accounts for 8% prepare and carries out mixing processing to it, and material is added into material during puddling
The water of volume 6%, the material ball that material is pressed into diameter using ball press after mixing as 35mm by material.By three, material ball point
Stage is toasted, the first stage by material ball 90 DEG C at a temperature of toast 7h, its internal moisture is slowly removed；Second
Stage carries out baking 2h at 250 DEG C, the transition stage as the phase III；Phase III in 500 DEG C of baking 2h, as material ball
The strength reinforcing stage.When the good material ball temperature of low-temperature bake is down to room temperature, it is collected.
Embodiment 2: mud is sunk as the converter slagging agent component wt% of base-material using whirling well are as follows: whirling well magnetic separation object 80% glues
Agent 8%, bentonite 12% are tied, irony oxide and fe total content account for the 95% of magnetic separation object, and binder uses warp to be crushed
Scrapped plastic products.Slagging agent preparation process flow is as shown in Figure 1, specific preparation method and step are as follows:
First the grab bucket of the heavy mud in whirling well is collected, is selected irony oxide and fe by the method for magnetic separation.
To select after material is put into pallet, by pallet be placed on secondary fire cut terminal to slab it is offline between this section of continuous casting billet transmit
The top of section, to its drying and processing.The ratio that the material of drying is broken into 2~10mm of partial size is accounted for 80% later, less than 2mm's
Ratio 3%, the particle that the ratio greater than 10mm is 17%.Simultaneously by the scrapped plastic products used as binder at 280 DEG C
At a high temperature of melt processed, heat needed for fusion process uses the waste heat of slab, is then condensed into bulk, will condense block later
It is broken into the particle that partial size is 8mm.It is prepared with material drying 75%, bentonite 15%, binder 10% again, and is mixed
Even processing, is added the water of volume of material 8% during puddling into material, and material is suppressed material using ball press after mixing
The material ball for being 45mm at diameter.Material ball point three phases are toasted, temperature of the first stage by material ball at 95 DEG C
Lower baking 8h, slowly by its internal moisture removal；Second stage carries out baking 3h at 220 DEG C, excessive as the phase III
Stage；Phase III carries out baking 4h at 470 DEG C, as the material ball strength reinforcing stage.The material ball temperature good to low-temperature bake
When degree is down to room temperature, it is collected.
Claims (2)
1. a kind of sink mud as the converter slagging agent of raw material using whirling well, which is characterized in that the converter slagging agent component wt% are as follows:
Whirling well magnetic separation object 70~80%, binder 8~15%, bentonite 10~20%；Wherein, whirling well magnetic separation object is irony oxidation
Object and fe, two kinds of substance total contents of irony oxide and fe account for the 95% of magnetic separation object, remaining is impurity；Binder is adopted
With through broken scrapped plastic products.
2. one kind sinks mud as the preparation method of the converter slagging agent of raw material using whirling well as described in claim 1, it is characterised in that:
(1) mud that sinks is collected: being collected using grab bucket to the heavy mud for being deposited on whirling well bottom；
(2) sink mud magnetic separation: using magnetic plant to heavy mud carry out magnetic separation, by heavy mud irony oxide and fe select；
(3) it dries: the material magneticly elected being dried using slab waste heat, i.e., the material magneticly elected is placed on baking pallet
On, then the pallet equipped with material is placed in above high-temperature continuous casting blank of the temperature greater than 200 DEG C and is dried, has been dried
Its moisture content of material requirement is lower than 1%；
(4) be crushed: material is broken: the material of drying is carried out break process, it is desirable that ratio of the material particular diameter in 2~10mm be
80%, the ratio less than 2mm is less than 5%, and the ratio greater than 10mm is less than 15%；
Waste plastic processing: being melted scrapped plastic products using the waste heat of slab at a high temperature of 200~300 DEG C, then cold
Bulk is congealed into, then is broken into the particle that partial size is 2~10mm for block is condensed；
(5) ingredient: matched in the ratio of 70~80wt% of material drying, 10~20wt% of bentonite, 8~15wt% of binder
Material；
(6) it mixes: the material prepared being put into blender and is stirred mixing, add water during puddling into material, add water
Amount is the 5~10% of volume of material；
(7) material of mixing pressure ball: is pressed into the material ball that diameter is 30~50mm by ball press；
(8) low-temperature bake: low-temperature bake be divided into three phases progress: the first stage by material ball 80~100 DEG C at a temperature of
5~8h is toasted, internal moisture is slowly removed；Temperature is increased to 200~300 DEG C by second stage, toasts 1~3h；Third rank
Temperature is increased to 400~600 DEG C by section, toasts 2~4h, the intensity of fortifier pellet；
(9) finished product is collected: good material ball temperature to be baked is cooled to room temperature, and slagging agent preparation is completed.
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| CN110157860B (en) * | 2019-05-14 | 2021-01-08 | 鞍钢股份有限公司 | Refining slag for purification and dealumination of ferrosilicon and preparation method thereof |
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| CN1298028A (en) * | 1999-11-24 | 2001-06-06 | 侯德成 | Cooling and fluxing agent for steel smelting in converter |
| CN101519722A (en) * | 2009-03-25 | 2009-09-02 | 韶关市曲江盛大工业物资有限公司 | Method for utilizing iron containing metallurgical dust |
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| CN103725877A (en) * | 2013-12-26 | 2014-04-16 | 南阳汉冶特钢有限公司 | Method for recycling converter steelmaking dust |
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| JP3774427B2 (en) * | 2002-10-23 | 2006-05-17 | 株式会社アステック入江 | Recycling method of steelmaking dust |
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| CN1298028A (en) * | 1999-11-24 | 2001-06-06 | 侯德成 | Cooling and fluxing agent for steel smelting in converter |
| CN101519722A (en) * | 2009-03-25 | 2009-09-02 | 韶关市曲江盛大工业物资有限公司 | Method for utilizing iron containing metallurgical dust |
| CN101560581A (en) * | 2009-05-16 | 2009-10-21 | 鞍钢股份有限公司 | Rotary furnace cooling agent and manufacturing method thereof |
| CN102808081A (en) * | 2012-08-22 | 2012-12-05 | 首钢总公司 | Steelmaking slag former and preparation method thereof |
| CN103725877A (en) * | 2013-12-26 | 2014-04-16 | 南阳汉冶特钢有限公司 | Method for recycling converter steelmaking dust |
| CN106148686A (en) * | 2015-04-19 | 2016-11-23 | 王虎 | A kind of carbon containing presses down slag cooled agglomerated pellet and Application way thereof |
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