CN106591575B - Low energy consumption coal-pressing ball and preparation method thereof - Google Patents
Low energy consumption coal-pressing ball and preparation method thereof Download PDFInfo
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- CN106591575B CN106591575B CN201710143442.5A CN201710143442A CN106591575B CN 106591575 B CN106591575 B CN 106591575B CN 201710143442 A CN201710143442 A CN 201710143442A CN 106591575 B CN106591575 B CN 106591575B
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- 238000003825 pressing Methods 0.000 title claims abstract description 65
- 238000005265 energy consumption Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000009628 steelmaking Methods 0.000 claims abstract description 29
- 229910052742 iron Inorganic materials 0.000 claims abstract description 27
- 238000005453 pelletization Methods 0.000 claims abstract description 18
- 239000002893 slag Substances 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 13
- 239000008188 pellet Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 48
- 238000002156 mixing Methods 0.000 claims description 28
- 239000000428 dust Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 150000001875 compounds Chemical class 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 9
- 239000000292 calcium oxide Substances 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 8
- 239000003566 sealing material Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 6
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 2
- 229920005596 polymer binder Polymers 0.000 claims description 2
- 239000002491 polymer binding agent Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 230000002269 spontaneous effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 29
- 239000010959 steel Substances 0.000 description 29
- 239000002956 ash Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000036284 oxygen consumption Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009491 slugging Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 230000010148 water-pollination Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention discloses a kind of low energy consumption coal-pressing ball and preparation method thereof, and the coal-pressing ball is mixed by steel-making dedusting waste material, iron slag and binder.Compared with prior art, low energy consumption coal-pressing ball provided by the invention and preparation method thereof, using the by-product of steel-making as raw material, moisture content is low, and hot tearing exponent data is good, under furnace high-temperature state, is not easy to burst, form holding capacity is strong；With suitable granularity and biggish bulk density, pellet size is uniform, is conducive to the gas permeability for improving stock column, improves gas flow distribution and blast furnace gas is promoted to utilize.Using dry ash briquetting technique, addition water is not had to, forming, chip index is low, and the compression strength of pelletizing is high, and the requirement of metallurgical cold-pressed pellets intensity is fully achieved；Coal-pressing ball category low-temperature concretion does not have to baking, and the inside exothermic reaction under spontaneous combustion state controls free surface moisture in pelletizing more evenly, and remains the good feature of ore reduction；Technique is relatively easy, runs smoothly, at low cost, environmental-friendly.
Description
Technical field
The present invention relates to the comprehensive utilization and environmental protection technical field of steel plant's solid waste resource, in particular to a kind of low energy
Consume coal-pressing ball and preparation method thereof.
Background technique
China Steel yield keeps rapid growth for years, becomes world steel big country.Incident environmental protection is asked
Topic also becomes increasingly conspicuous, and the pollution of trade waste produced by Iron and Steel Enterprises in China influences location periphery increasingly severely
Environment, and start restrict enterprise itself development.Therefore, eliminate trade waste pollution, realize clean manufacturing, particularly place
The trade wastes such as the various dust that reason production each process generates are the weights that China's steel and iron industry keeps sustainable and healthy development from now on
Want index.
Steel production is made of multiple working procedures such as feedstock processing (sintering, pelletizing, coking), ironmaking, steel-making, steel rolling.Often
Ton steel about generates 5%~10% various dust, wherein it is main include be sintered dust, coking dust, blast furnace dust and dirt mud,
Converter dust, electric furnace dust, mill scale and dirt mud etc..It is counted according to related data, the dust effective rate of utilization in China is insufficient
80%.The characteristics of these dust is iron content and carbon containing, is valuable secondary resource.However since complicated component, granularity change model
It encloses big and moisture and fluctuates the reasons such as big so that the utilization of dust is more difficult.
Especially the most complicated to make steel dry method dust ash composition in many dust of steel plant, its inside is containing about
After meeting water following aquation resolution reaction can occur for 10%~30% CaO, 10% or so the pole MgO, CaO and MgO unstability,
A large amount of heat can be released in reaction process, volume can also expand after reaction.And dedusting ash fine size, specific surface area
Greatly, hydrophily is poor, difficult molding, utilizes degree-of-difficulty factor maximum.
To steel-making dust resource recycling, both reduce environmental pollution, reduces energy consumption, effectively recycled and removed
Iron in dust and slag, while slugging and cooling can also be played the role of.Reach volume increase, consumption reduction, the mesh for reducing steel mill cost
, while meeting the requirement of country's reduction energy consumption, environmental protection and energy saving again.
The defect of the prior art: the most common process program use will directly make steel dedusting ash etc. and match into sintering at present
Material, the technique of slagging agent is added in midway, but energy consumption is high, and the iron conversion ratio in dedusting ash and slag is low；Or use wet type pelletizing
Technique, entered back into after being prepared into raw material ball with nodulizer it is rotary kiln sintered, but due to being added to water in pelletizing, in sintering process
In increase sintering energy consumption, meanwhile, this kind of pelletizing intensity difference is also easy to produce pelletizing fragmentation during the sintering process.
Summary of the invention
In order to solve the above technical problems, the present invention provides low energy consumption coal-pressing ball and preparation method thereof, to solve maximum journey
The beneficial elements such as the metallic iron inside degree ground recycled dust removing ashes reduce production cost, economize on resources, reduce pollution problem.
The technical solution adopted by the invention is as follows: a kind of low energy consumption coal-pressing ball, key is by following mass fraction
Raw material composition: 45-60 parts of dedusting waste material, 30-54 parts of iron slag, 1-10 parts of binder of steel-making.
Preferably, the moisture content of the coal-pressing ball is a, 0 < a≤5.0%wt；Full weight of iron point in the coal-pressing ball
Shuo≤55.0%wt, quality Fen Shuo≤3.0%wt of calcium oxide in the coal-pressing ball, silica in the coal-pressing ball
Mass fraction is c, 0 < c≤5.0%wt.
Preferably, the steel-making dedusting waste material is 48 parts, and iron slag is 44 parts, and binder is 8 parts.
Preferably, the steel-making dedusting waste material is one or both of steel-making dedusting ash, Sludge from Dust Removal of Steelmaking.
Preferably, the iron slag is one or both of iron scale, steel-making slag powder.
Preferably, the bonding agent is mixture, waterglass or the polymer binder of bentonite and spent pulp liquors.
A kind of preparation method of low energy consumption coal-pressing ball, key are to sequentially include the following steps:
Step 1: being mixed after steel-making dedusting waste material and iron slag are tentatively uniformly mixed by once sealing material
Expect I, then mixture I is stirred, mixture II is obtained by secondary material of sealing after mixing well it again, is subsequently added into
Dedusting waste material is made steel, so as to adjust mixture III is obtained by sealing material three times after the water content of mixture II；
Step 2: mixture III obtained in step 1 is added in batch mixer, and binder is added simultaneously, into one
Step is uniformly mixing to obtain compound mixing；
Step 3: compound mixing obtained in step 2 is delivered to ball press, it is pressed under mechanical force compound
Pelletizing；
Step 4: composite pellet obtained in step 3 is obtained finished product coal-pressing ball by naturally dry.
Preferably, material is once sealed in the step 1 specifically: it is more than hour to be placed 2 for mixed just mixing；
Secondary in the step 1 seals material specifically: will stir rear mixture I again and place 1 hour or more；In the step 1
Material is sealed three times specifically: places the mixture II for mixing up moisture again 10 minutes or more.
Preferably, the whipping temp of the batch mixer in the step 2 is greater than 30 DEG C.
Preferably, the ball press revolving speed in the step 3 is 5-20 revs/min.
The coal-pressing ball obtained by above-mentioned steps, good sphericity, full weight of iron Fen Shuo≤55.0% in coal-pressing ball
Wt, moisture content≤5.0%wt of coal-pressing ball, quality Fen Shuo≤3.0%wt of calcium oxide, silica in the coal-pressing ball
Mass fraction≤5.0%wt；Dry bulb compression strength is up to 1500-4000N, and 1 meter of high free fall test is up to 5 times, hot tearing
Index (DI) is 0.15%-2.2%, and 90% or more the granularity of coal-pressing ball is distributed within the scope of 10mm-50mm.
The utility model has the advantages that compared with prior art, low energy consumption coal-pressing ball provided by the invention and preparation method thereof, using refining
The by-product of steel -- steel-making dedusting ash (or sludge), ironmaking dedusting ash, ball milling steel slag or iron scale etc. are used as raw material, moisture content
Low, hot tearing exponent data is good, under furnace high-temperature state, is not easy to burst, form holding capacity is strong；With suitable granularity and larger
Bulk density, make coal-pressing ball be added converter after can rapidly enter slag blanket, quick slag；Coal-pressing ball epigranular, is conducive to
The gas permeability of stock column is improved, gas flow distribution is improved and blast furnace gas is promoted to utilize.Using dry ash briquetting technique, do not have to addition water,
Forming, chip index is low, and the compression strength of pelletizing is high, and the requirement of metallurgical cold-pressed pellets intensity is fully achieved；Coal-pressing ball belongs to low
Warm consolidation, does not have to baking, and internal exothermic reaction controls free surface moisture in pelletizing more evenly under spontaneous combustion state, and remains mine
The Well-recovered feature of stone；Technique is relatively easy, runs smoothly, at low cost, and is conducive to protection environment.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below with reference to subordinate list and specific embodiment party
Formula elaborates to the present invention.
One, a kind of low energy consumption coal-pressing ball
Embodiment 1: the configuration proportion of each raw material in low energy consumption coal-pressing ball
Raw material each in low energy consumption coal-pressing ball is mixed by mass fraction described in table 1 respectively, obtains 3 groups of difference mixing
Low energy consumption coal-pressing ball I~III of ratio.
The low energy consumption coal-pressing ball of 1 different mixing proportion of table (mass fraction)
Embodiment 2: the preparation method of low energy consumption coal-pressing ball
Step 1: by once sealing material after 54 parts of 42 parts of steel-making dedusting ash and iron scale are tentatively uniformly mixed,
Just mixture I will be obtained after 2 hours placed by mixing；Then mixture I is stirred, is passed through after mixing well it again
Cross it is secondary seal material, i.e., obtain mixture II after placing mixture I again 1 hour；It is subsequently added into 3 parts of dry steel-making dedusting ash,
After water content so as to adjust mixture II, make the moisture content of mixture II in 10%wt, by sealing material three times, i.e., will mix up water
The mixture II divided is placed again obtains mixture III after ten minutes；
Step 2: mixture III obtained in step 1 is added in batch mixer, the whipping temp of batch mixer is 30
DEG C, and 1 part of mixture of bentonite and spent pulp liquors is added simultaneously, it futher stirs and uniformly obtains compound mixing；
Step 3: compound mixing obtained in step 2 is delivered to ball press, ball press revolving speed is 5 revs/min, in machinery
Composite pellet is pressed under power effect；
Step 4: composite pellet obtained in step 3 is obtained finished product coal-pressing ball I by naturally dry.
Full weight of iron score in the coal-pressing ball that the embodiment obtains is 45.0%wt, and the moisture content of coal-pressing ball is
5.0%wt, the mass fraction of calcium oxide are 3.0%wt, and the mass fraction of silica is 5.0%wt in the coal-pressing ball；
Dry bulb compression strength is up to 1500N, and 1 meter of high free fall test is up to 5 times or more, and hot tearing index (DI) is 2.2%, cold-pressing balls
The granularity 90% of group is distributed within the scope of 10mm-50mm.
Embodiment 3: the preparation method of low energy consumption coal-pressing ball
Step 1: will 5 parts of 56 parts of dedusting mud of steel-making, 25 parts of iron scale and steel-making slag powder be tentatively uniformly mixed after by
Material once is sealed, i.e., obtains mixture I after first mixing being placed 5 hours；Then mixture I is stirred, fills it again
Divide after mixing and seal material by secondary, i.e., obtains mixture II after placing mixture I again 2 hours；It is subsequently added into dry steel-making
4 parts of dedusting ash, after the water content so as to adjust mixture II, make the moisture content of mixture II in 6%wt, by sealing material three times,
The mixture II that moisture will be mixed up is placed again obtains mixture III after forty minutes；
Step 2: mixture III obtained in step 1 is added in batch mixer, the whipping temp of batch mixer is 45
DEG C, and 10 parts of waterglass are added simultaneously, it futher stirs and uniformly obtains compound mixing；
Step 3: compound mixing obtained in step 2 is delivered to ball press, ball press revolving speed is 20 revs/min in machinery
Composite pellet is pressed under power effect；
Step 4: composite pellet obtained in step 3 is obtained finished product coal-pressing ball II by naturally dry.
Full weight of iron score in the coal-pressing ball that the embodiment obtains is 55.0%wt, and the moisture content of coal-pressing ball is
3%wt, the mass fraction of calcium oxide are 6.0%wt, and the mass fraction of silica is 3.2%wt in the coal-pressing ball；It is dry
Ball compression strength is up to 3800N, and 1 meter of high free fall test is up to 12 times, and hot tearing index (DI) is 0.8%, coal-pressing ball
Granularity 95% is distributed within the scope of 20mm-45mm.
Embodiment 4: the preparation method of low energy consumption coal-pressing ball
Step 1: 9 parts of 30 parts of dedusting ash of steel-making, 15 parts of dedusting mud of steel-making, 35 parts of iron scale and steel-making slag powder are tentatively stirred
It mixes after mixing by once sealing material, i.e., obtains mixture I after first mixing being placed 7 hours；Then mixture I is carried out
It stirs, seals material by secondary after mixing well it again, i.e., obtain mixture II after placing mixture I again 3 hours；Then
It is added dry 3 parts of steel-making dedusting ash, after the water content so as to adjust mixture II, makes the moisture content of mixture II in 8%wt,
By sealing material three times, i.e., mixture III is obtained after placing the mixture II for mixing up moisture again 1 hour；
Step 2: mixture III obtained in step 1 is added in batch mixer, the whipping temp of batch mixer is 55
DEG C, and 8 parts of waterglass are added simultaneously, it futher stirs and uniformly obtains compound mixing；
Step 3: compound mixing obtained in step 2 is delivered to ball press, ball press revolving speed is 10 revs/min, in machine
Composite pellet is pressed under the effect of tool power；
Step 4: composite pellet obtained in step 3 is obtained finished product coal-pressing ball III by naturally dry.
Full weight of iron score in the coal-pressing ball that the embodiment obtains is 59.8%wt, and the moisture content of coal-pressing ball is
1.16%wt, the mass fraction of calcium oxide are 5.5%wt, and the mass fraction of silica is 2.8%wt in the coal-pressing ball；
Dry bulb compression strength is up to 4000N, and 1 meter of high free fall test is up to 15 times, and hot tearing index (DI) is 0.12%, coal-pressing ball
Granularity 96.5% be distributed within the scope of 25mm-50mm.
Two, converter will be carried out using coal-pressing ball prepared by the present invention and using general pelletizing made from wet processing respectively
STEELMAKING PRODUCTION Experimental comparison research, by taking coal-pressing ball III as an example:
Steel-smelting electric furnace is added with steel scrap respectively in general pelletizing and coal-pressing ball III, every furnace ton steel uses pelletizing 44kg/t,
Every group of test heat is 10 times, is then averaged, Comparative result result is as shown in the table:
Steel scrap per ton known to above data comparison is little using influence of the general pelletizing to every energy-saving index, and uses cold
Pressure ball group II I44kg can reduce by 20.86 degree of electric power consumption per ton steel, and ton steel steel technology reduces 6.45kg, and molten steel recovery rate improves
0.43%, ton steel oxygen consumption reduces by 5.66 cubes.(1) steel technology reduce the main reason for: lime in slagging course easily with
SiO2 generates 2CaOSiO2 high-melting-point substances.FeO can change 2CaOSiO2 form in pelletizing, reach the mesh of Fast Slag Melting
's.The oxidized metal iron that FeO is blown into electric furnace instead of a part in pelletizing forms FeO and carrys out slugging effect, to reduce iron
Oxidation, improves molten steel recovery rate, reduces steel technology；(2) the main reason for oxygen consumption reduces: since electric furnace is in oxygen
The change phase needs to be blown into the elements such as carbon silicomanganese phosphorus in dioxygen oxidation molten metal, and containing FeO in pelletizing can be these elements of oxidation
Certain oxygen is provided, achievees the purpose that reduce certain oxygen consumption with this；(3) the main reason for power consumption reduces: coal-pressing ball is being added
It can make lime rapid slagging after electric furnace, the effect of quick submerged arc reduces the loss of electric arc radiant heat during heating, reaches
Reduce the purpose of power consumption.By the way that multiple coal-pressing ball is added in steel scrap, steel technology is reduced in pneumatic steelmaking, oxygen disappears
The effect of consumption is also embodied on electric furnace.Meanwhile coal-pressing ball can Fast Slag Melting, form foamed slag and play the effect of submerged arc
Fruit reduces the loss of arc radiation heat, reduces electric power consumption per ton steel.
Finally it is to be appreciated that foregoing description is merely a preferred embodiment of the present invention, those skilled in the art is in the present invention
Enlightenment under, without prejudice to the purpose of the present invention and the claims, multiple similar expressions, such change can be made
It changes and falls within the scope of protection of the present invention.
Claims (7)
1. a kind of preparation method of low energy consumption coal-pressing ball, it is characterised in that sequentially include the following steps:
Step 1: by once sealing after 45-60 parts and iron slag 30-54 parts of steel-making dedusting waste material are tentatively uniformly mixed
Material obtains mixture I, then stirs mixture I, obtains mixture by secondary material of sealing after mixing well it again
II is subsequently added into steel-making dedusting waste material, so as to adjust mixture III is obtained by sealing material three times after the water content of mixture II；
Step 2: mixture III obtained in step 1 is added in batch mixer, and 1-10 parts of binder are added simultaneously, into
One step is uniformly mixing to obtain compound mixing；
Step 3: compound mixing obtained in step 2 is delivered to ball press, composite pellet is pressed under mechanical force；
Step 4: composite pellet obtained in step 3 is obtained finished product coal-pressing ball by naturally dry；
Wherein, material is once sealed in the step 1 specifically: it is more than hour to be placed 2 for mixed just mixing；The step
Secondary in rapid one seals material specifically: will stir rear mixture I again and place 1 hour or more；Sealing in the step 1 three times
Material specifically: place the mixture II for mixing up moisture again 10 minutes or more.
2. the preparation method of low energy consumption coal-pressing ball according to claim 1, it is characterised in that: mixed in the step 2
The whipping temp of material machine is greater than 30 DEG C.
3. the preparation method of low energy consumption coal-pressing ball according to claim 1, it is characterised in that: the pressure in the step 3
Ball machine revolving speed is 5-20 revs/min.
4. the preparation method of low energy consumption coal-pressing ball according to claim 1-3, it is characterised in that: the steel-making
Dedusting waste material is one or both of steel-making dedusting ash, Sludge from Dust Removal of Steelmaking.
5. the preparation method of low energy consumption coal-pressing ball according to claim 1-3, it is characterised in that: the iron content
Waste residue is one or both of iron scale, steel-making slag powder.
6. the preparation method of low energy consumption coal-pressing ball according to claim 1-3, it is characterised in that: the bonding
Agent is one of bentonite and mixture, waterglass or the polymer binder of spent pulp liquors.
7. the preparation method of low energy consumption coal-pressing ball according to claim 1-3, it is characterised in that: the cold pressing
The moisture content of pelletizing is a, 0 < a≤5.0%wt；Full weight of iron Fen Shuo≤55.0%wt, the cold-pressing balls in the coal-pressing ball
Quality Fen Shuo≤3.0%wt of calcium oxide in group, the mass fraction of silica is c, 0 < c≤5.0% in the coal-pressing ball
wt。
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| CN108642231B (en) * | 2018-05-15 | 2020-06-23 | 鞍钢股份有限公司 | Converter slag modifier and method for preparing low-alkalinity slag system by using same |
| CN110894576A (en) * | 2018-09-13 | 2020-03-20 | 中冶宝钢技术服务有限公司 | Metallurgical auxiliary material and preparation method thereof |
| CN110016551A (en) * | 2019-05-06 | 2019-07-16 | 中冶华天工程技术有限公司 | Cold rolling sludge converter resource utilization method |
| CN110747345A (en) * | 2019-11-05 | 2020-02-04 | 邯郸钢铁集团有限责任公司 | Converter fly ash pressed brick and preparation and utilization methods thereof |
| CN111235386A (en) * | 2020-01-19 | 2020-06-05 | 中冶宝钢技术服务有限公司 | Method for forming dedusting ash |
| CN111154972B (en) * | 2020-01-21 | 2021-08-20 | 鞍钢股份有限公司 | Preparation method of spherical granular iron for steelmaking |
| CN111893297B (en) * | 2020-08-06 | 2021-05-11 | 河北蓝海智投环保科技有限公司 | Preparation method of cold-pressed block of converter fly ash |
| CN112174470B (en) * | 2020-09-30 | 2023-05-23 | 宝钢湛江钢铁有限公司 | Treatment method of cold rolling oily sludge |
| CN112981095B (en) * | 2021-02-08 | 2023-01-31 | 山西太钢不锈钢股份有限公司 | Iron scale ball pressing process |
| CN113278755A (en) * | 2021-06-02 | 2021-08-20 | 维泰(南通)金属材料有限公司 | Method for improving metallization rate in steel solid waste smelting reduction process |
| CN114875236A (en) * | 2022-05-17 | 2022-08-09 | 新源县渣宝环保技术有限公司 | Method for producing high-strength pellets by using steel slag fine powder |
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