CN104451137B - Production method of cold-solidified rusted pellet - Google Patents
Production method of cold-solidified rusted pellet Download PDFInfo
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- CN104451137B CN104451137B CN201410764010.2A CN201410764010A CN104451137B CN 104451137 B CN104451137 B CN 104451137B CN 201410764010 A CN201410764010 A CN 201410764010A CN 104451137 B CN104451137 B CN 104451137B
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Abstract
The invention discloses a production method of a cold-solidified rusted pellet. The production method comprises the following steps: step a, manufacturing a pellet; step b, pre-maintaining the pellet, namely sending the manufactured raw pellet to a belt maintainer in a condition that the thickness of a pellet material layer is 100mm to 300mm, supplying hot air or hot smoke to the belt maintainer, ensuring that the temperature of the pellet material layer is 30 to 50 DEG C, maintaining for 8-24 hours, controlling the flow rate of the hot air or the hot smoke, and ensuring that the water content of the maintained pellet is 5wt% to 7wt% and the strength of each pellet is larger than or equal to 150N; step c, performing steam maintenance; step d, supplying water and supplying air for maintenance; step e, after 4 to 5 days of pellet pre-maintenance, steam maintenance and water-supplied and air-supplied maintenance, screening to obtain the cold-solidified rusted pellet. The cold-solidified rusted pellet produced by the method disclosed by the invention is remarkably improved in compression strength after the raw pellet is pre-maintained and is convenient for subsequent large-scale production.
Description
Technical field
The invention belongs to metallurgical raw material preparing technical field, be specifically related to a kind of production freezing off knot rust pellet
Method.
Background technology
For a long time, people's powder agglomeration method outside exploratory development sintering, oxidizing roasting always, special
Not being to seek a kind of iron-smelting furnace charge manufactured without the method for work in hot environment consolidation, cooled agglomerated pellet is exactly so
Background under occur and grow up.
The advantage that cooled agglomerated pellet method produces is that process equipment is simple, less energy consumption, low cost, pollution-free.Freeze off
The development of pelletizing technology makes iron and steel enterprise recycle all kinds of metallurgical dust completely, realize the warp of circulation factory
Ji growth pattern is possibly realized.But, there is the biggest deficiency, subject matter in producing of current this pelletizing
It is that the natural curing time is longer, needs large area curing field.Or product high-temperature behavior is poor, it is impossible to meet big high
Stove manufacturing requirements (intensity >=2000N/P) so that the extensive iron-containing waste that processes is restricted.
Such as, use cement concretion method, under conditions of adding 10% cement, need natural curing 4--6 week
The comprcssive strength of pelletizing just can be made to reach 800--2000N/P, pass through for bonding agent with waterglass
200-300 DEG C of heat treatment can accelerate pelletizing consolidation rate, but production cost is high.The most above-mentioned with inorganic adhesive
The product produced for the two kinds of cooled agglomerated pellet methods represented gradually loses strong in arriving stove after the temperature section of 600 DEG C
Degree, therefore, pelletizing may be only available for medium and small blast furnace.
And apply the cooled agglomerated pellet that organic adhesive makes in various ways, although there is higher machinery under room temperature
Intensity, but owing to, in pyroprocess, organic adhesive was wholly absent before metallic iron joins brilliant bonding appearance,
So, the cooled agglomerated pellet made with organic adhesive at present is used for pneumatic steelmaking needs.
Freezing off knot rust pellet (agglomerate) is to be added suitably by the powdery mixing raw material containing a certain amount of metallic iron
Rust bonding agent, through mixing, pelletizing or briquetting, the bead made under rational curing condition or group
Block.
The advantage freezing off knot rust pellet method maximum is product room temperature pellet strength >=2000N/P, meanwhile, high temperature
Smelting performance is preferable, can be used for big blast furnace ironmaking and produces.This is a kind of cold bound pellet having very much development potentiality
Production method.But current this pelletizing method remains the biggest deficiency, its shortcoming is cannot to solve green-ball in production
Intensity is low, product recovery rate is low, and consolidation time is long simultaneously, the problem needing bigger place.With existing skill
Art still difficulty is accomplished scale production.
The maintenance process of a kind of rust bonded pellet that the patent No. 200810304508.5 relates to, utilizes pelletizing
The heat energy self produced accelerates the speed of pelletizing consolidation reaction, shortens the week of pelletizing production to a certain extent
Phase, reduce maintenance place, but, owing to the green pellets made is directly placed into maintenance in maintenance container, because
Early stage green pellets initial strength in curing pool is low, moisture big, if the pelletizing bed of material is blocked up, reacts in rustization
Under exothermic effect, though by patent document is given control pelletizing layer temperature method, still without
Method solve middle and upper part pelletizing layer soften because of moisture supersaturation, swelling, cracking and the phenomenon of efflorescence,
Therefore yield rate is low cannot realize large-scale production；Meanwhile, at the pelletizing maintenance initial stage, rustization response speed is very
Slowly, self heat energy is few, causes the production cycle long.
A kind of cooled agglomerated pellet that the patent No. 200610031958.2 relates to is quickly with bonding agent, although pelletizing warp
>=the intensity level of 2000N/P can be obtained after crossing maintenance in 24 hours, but technique employs metal iron powder and trichlorine
Changing ferrum, production cost is high.Simultaneously in patent document, do not provide the pelletizing bed of material in maintenance processes thick
Degree, by traditional handicraft, pelletizing is the thickness ＜ 100mm of the bed of material in maintenance processes, and therefore large-scale production needs
The maintenance place wanted is the biggest.
Summary of the invention
It is an object of the invention to: there is production cycle length, life for prior art freezes off knot rust pellet
Produce inefficient problem, it is provided that a kind of production method freezing off knot rust pellet, the production efficiency of pelletizing is high,
Production cycle shortens further, can accomplish scale production.
To achieve these goals, the technical solution used in the present invention is:
A kind of production method freezing off knot rust pellet, comprises the following steps:
A. pelletizing makes, and the raw material making pelletizing includes steel scoria magnetic separation iron powder or the scum magnetic separation of 40-60wt%
Iron powder, the ground hematite of 39-59wt% and the magnesium chloride of 0.5-1wt%, and steel scoria magnetic separation iron powder or scum magnetic separation
Content≤the 6wt% of CaO in iron powder, and the raw material of pelletizing will be made or only by steel scoria magnetic separation iron powder or scum
Magnetic separation iron powder to 120-160 mesh, then utilizes dribbling balling machine or to roller ball press work through ball-milling technology grinding
Skill is fabricated to green pellets, and the water content controlling green pellets is 9-11wt%, and acid-base value pH value is 7-9.8；
B, pelletizing precuring, send into the green pellets made in belt maintaining machine, and pelletizing feed layer thickness is
100-300mm, sends into hot-air or heat smoke, it is ensured that the temperature of the pelletizing bed of material exists in belt maintaining machine
30-50 DEG C, maintenance 8-24h, and control the flow of hot-air or heat smoke, it is ensured that after maintenance, pelletizing is aqueous
Amount is 5-7wt%, the intensity >=150N of single pelletizing；
C, steam curing, send into the pelletizing through precuring in curing pool, and pelletizing feed layer thickness is
800-3000mm, arranges steaming device bottom curing pool and pelletizing carries out steam curing, control the temperature of steam
Degree, it is ensured that temperature >=60 DEG C of the pelletizing bed of material, closes curing pool with tarpaulin above curing pool, steam curing
6-10h；
D, water supply and air feed maintenance, open the tarpaulin above curing pool after steam curing, by being arranged on maintenance
The Sprinkler on top, pond supplies water to the pelletizing bed of material；For while water curing, by being arranged on bottom curing pool
Air-supply arrangement is to pelletizing bed of material air feed, and the water content controlling the pelletizing bed of material is 2-7wt%, temperature >=40 DEG C；
E, through pelletizing precuring, steam curing, water supply and air feed maintenance, altogether after maintenance in 4-5 days, warp
Screening obtains freezing off knot rust pellet.
Preferably, in step a, make TFe >=54wt%, MFe >=20wt% in the raw material of pelletizing.
Preferably, TFe >=65wt%, the MFe of the steel scoria magnetic separation iron powder in raw material or scum magnetic separation iron powder >=
45wt%.
Preferably, during steam curing, steam is to carry out friendship wet, hot by convection with pelletizing layer
Changing, steam pressure >=0.04Mpa, vapor (steam) temperature is 90-100 DEG C.
Preferably, whole steam curing process is divided into 2-3 time and completing, and wherein, often completes primary steam maintenance,
Open tarpaulin, after the steam got rid of in curing pool, then cover tarpaulin, continue steam curing.
Preferably, the whole process for water curing is divided into first half and latter half, controls the water supply of Sprinkler
Amount, in first half, it is ensured that the water content of pelletizing is in 5-7wt%, temperature >=60 DEG C of the pelletizing bed of material；Later half
Phase, it is ensured that the water content of pelletizing is in 2-4wt%, temperature >=40 DEG C of the pelletizing bed of material.
Preferably, during whole steam curing and confession water curing, filled by curing pool air supply at the bottom simultaneously
Put to pelletizing bed of material air feed.
Preferably, during pelletizing precuring, described belt maintaining machine be preferably net belt type maintaining machine or
Drying grate.
Owing to have employed technique scheme, the invention has the beneficial effects as follows:
(1) to make pelletizing mixing raw material or one of steel slag ball milling magnetic separation iron powder by ball milling
Reason, controls specific surface area and the acid-base value of pelletizing of pelletizing production raw steel scum ball milling magnetic separation iron powder；And
Use steam curing, for the process means such as water curing, air feed maintenance, it is ensured that it is anti-that pelletizing completes quickly rust
In requisition for raw material specific surface area, system basicity, and the condition such as oxygen medium, it is achieved that pelletizing high intensity
(>=2000N), and the quickly rust of pelletizing, consolidation, the production cycle is the fastest up to 4-5 days, overcomes
Tradition rustization cold consolidation technique production cycle length, place take big shortcoming, and the realization for large-scale production is created
Make condition.
(2) by the precuring of green pellets is processed, it is ensured that pelletizing has certain initial strength and aqueous
Rate design load, pelletizing layer thickness of feed layer in curing pool can reach 800mm 3000mm, produces finished product
Rate >=98%.
(3) while steam curing and supplying water curing, air feed operation is the most persistently carried out, it is ensured that around pelletizing
Having enough oxidizing atmosphere, meanwhile, persistently air-supply can also balance pelletizing layer rustization reaction liberated heat,
Complete hydrated ferric oxide. to be dehydrated to ferrum oxide crystal transition, can quickly form pellet strength.
(4) at the initial stage of rustization reaction, in pelletizing, metal Ferrum content is high, and pelletizing water requirement is relatively big, later stage ball
Group's metal Ferrum content is low, and pelletizing water requirement is less, by controlling respectively for the water supply of Sprinkler in water curing
Amount, it is ensured that what rustization was reacted continues, is rapidly performed by, and reasonably arranges output simultaneously, is conducive to saving
Water resource.
(5) rustization consolidation process substantially a kind of newborn hydration ferrate flocculent thing (goethitum or lepidocrocite) knot
Brilliant cementing process.The fiber in rust pellet with reticulated structure can be substantially observed under the phase eyeglass of ore deposit
Shape structure, nascent crystals mineral-filled is in bloodstone, magnetite ore particles gap, so that rustization ball has one
Determine intensity.This by Fe2O3 crystallization formed intensity be similar to sintering deposit and acidic pellet ore.Therefore rust
Pelletizing has preferable high temperature metallurgical properties, the enforcement of this technology, and energy scale turns to big blast furnace and substitutes the most deficient
Weary block iron mine improves the furnace charge of high-quality.
(6) present invention be applicable to steel plant scales recycling iron-containing waste and, low-grade powder iron mine,
Steel and iron industry can be developed into and set up the preferred significant technological process of circular type factory, before there is good development
Scape and important social meaning.
Detailed description of the invention
Addressed technological ball group quickly rustization consolidation strength mechanism is achieved in that
(1) process of rustization consolidation is exactly that metallic iron aoxidizes under the effect of certain basicity Water Under and oxygen
Generate the process of Fe (OH) 3, along with the Fe (OH) 3 that carries out of reaction can automatic dehydration generation Fe2O3 knot
Crystal, its chemical equation is as follows:
2Fe+O2+2H2O=2Fe2++4(OH)-+ heat
4Fe(OH)2+02+2H20=4Fe (OH)3+ heat
6Fe(0H)2+02=2Fe3O4+6H2O+ heat
4Fe3O4+O2+18H2O=12Fe (OH)3+ heat
2Fe(0H)3+ heat=Fe203+3H2O
Because Fe2O3Easily aquation, then:
Fe2O3+H2O=2FeOOH
Or Fe2O3+nH2O=Fe2O3nH2O
Fe2O3nH2O (or FeOOH), is commonly called as lepidocrocite, is also hydrous ferric oxide.Hydrous ferric oxide is strong
Spend relatively low, it is necessary to rustization intensity could be formed by dehydration.
By aforesaid equation it can be seen that the process that pelletizing completes intensity is divided into rustization and two stages of consolidation
Realize.Rustization reaction is highly exothermic oxidation reaction, along with the rising (ball of pelletizing layer epidemic disaster
Group layer in temperature up to more than 60 DEG C), rust agent promotion, rustization response speed improves therewith, great Liang Gao
Metallic iron microgranule and the ferrous ion of fineness are oxidized to rapidly under the oxidizing condition of neutral meta-alkalescence
Fe(OH)3.Under rustization reacts exothermic assosting effect, Fe (OH)3Carry out dehydration and form hydration
Ferrate flocculent thing [FeO (OH) nH2O] crystalline solid.Along with the further development of dehydration, ultimately form
Fe2O3Interconnecting of crystalline solid, it is achieved consolidation process.
Therefore, the essential condition of rustization consolidation is oxidizing atmosphere, moisture, heat and drying and dehydrating, as long as being
Pelletizing provides enough oxidizing atmosphere, moisture and enough heats to complete drying and dehydrating, and (dewatering speed should be with
Rustization response speed balances each other), it is possible to accelerate rustization reaction process, it is achieved pelletizing is rapidly solidified.
(2) rustization and consolidation process should complement each other, intersect synchronizations, balance and carry out, and whole through pelletizing
Individual maintenance processes, completing rustization reaction in traditional handicraft is speed limit link.Preferred as above-mentioned technology theory,
In pelletizing, the control process of rustization consolidation reaction, should have a pelletizing optimum moisture content in the different stages of reaction
Design load.In initial reaction stage, the reaction of pelletizing rustization is more fierce, and moisture content needs larger, preferably controls
System is at 5-7%.Phase after the reaction, in pelletizing, metal Ferrum content is relatively low, and the total amount of rustization reaction is less, rustization
The moisture that reaction needs can be lower.It is preferably controlled in 2-4%.
(3) rustization reaction is an electrochemical process, and the generation of this process and development, with residing media environment
Acid-base value (P H) value be correlated with.Research shows, when pH value≤9.8 in pelletizing, rustization reaction can be entered faster
OK.The activity of metal iron powder rustization is higher.As pH value ＞ 11.5 in pelletizing system, rustization reaction is only at rust
Carry out under the catalytic action of agent chloride ion.And response speed is slower.
(4) rustization reaction is solid-liquid two phase reaction, and its reaction rate is just amassed into metal iron powder specific grain surface
Ratio.Therefore, the specific surface area of iron powder is the biggest, and powder microfine metallic iron excites in natural or rust agent
Under the conditions of, there is the highest chemism, and its granularity is thinner, better, its activity is the highest for dispersed,
The utilization rate of metallic iron is the highest, and the speed of various correlated response is the highest, and therefore rustization is reacted at faster speed
Realize.
This is the theoretical basis that pelletizing quickly rust forms consolidation strength, enters pelletizing rustization consolidation reaction speed
The control of journey, the substantially foundation of aggregate balancing system and control in a pelletizing.Temperature in system, wet
The design of the factors such as degree, Oxidant oxygen and the specific surface area of composition pelletizing granule, system basicity,
It is to realize pelletizing quickly rust and the basis of consolidation and prerequisite.
The chemical composition of the primary raw material of the rust pellet employed in embodiments of the invention is as shown in table 1,
Can certainly use the raw material of chemical composition of other ratios to realize the present invention, such as ground hematite 1 He
Ground hematite 2 is exactly the raw material that the ratio of two kinds of chemical compositions is different.Below, explain in conjunction with specific embodiments
State technical scheme.
Table 1: rust pellet primary raw material chemical composition analysis (%)
| Title | TFe | MFe | CaO | SiO2 | C | TiO2 | S | P |
| Scum magnetic separation iron powder | 75.00 | 58.00 | 4.52 | 1.27 | 2.27 | 0.38 | 0.36 | 0.076 |
| Steel scoria magnetic separation iron powder | 70.00 | 45.00 | 3.85 | 1.32 | 0.50 | 0.22 | 0.10 | 0.26 |
| Ground hematite 1 | 42.19 | / | 0.61 | 22.57 | / | / | 0.07 | 0.10 |
| Ground hematite 2 | 45.50 | / | 0.38 | 19.58 | / | / | 0.09 | 0.142 |
Embodiment 1:
A kind of production method freezing off knot rust pellet, comprises the following steps:
A. pelletizing makes, and the raw material making pelletizing includes the scum magnetic separation iron powder of 40wt%, the red ferrum of 59wt%
The magnesium chloride of breeze 1 and 1wt%, in scum magnetic separation iron powder, the content of CaO is 4.52wt%, uses this former
Material and match ratio, TFe=54.89%, MFe=23.20% in compound.Through all mixing, drying, ball
After being milled to 120 mesh, the pre-add that compound fine powder forms via spiral weighing balance and atomized water Control System of Microcomputer
Form the pre-wet stock of aqueous 7% in water balling-up biaxial rneader, and enter formation Ф in disk balling machine
The green pellets of 10-25mm.Described green pellets moisture content 9.6%.Acid-base value PH=9.4 in green pellets.
B, pelletizing precuring, the green pellets above-mentioned technique produced is sent in net belt type maintaining machine, the pelletizing bed of material
Thickness 300mm, sends into 40 DEG C of hot-airs, curing time 8h in belt maintaining machine.Pelletizing is after precuring
Moisture 6.5%, initial strength is 180N.Belt maintaining machine uses net belt type maintaining machine.
C, steam curing, be transported to above-mentioned precuring pelletizing in the square curing pool of 9.0 meters of x6.0 rice, pelletizing
Layer thickness 1500mm.Curing pool top seals with tarpaulin.By being arranged on the conveying steam bottom curing pool
Device is forced pelletizing is carried out steam curing by convection, and steam pressure is 0.04Mpa, vapor (steam) temperature
It is 90 DEG C, steam-cured time 8h.Now pelletizing layer temperature is 65 DEG C.
Whole steam curing process is divided into 2 times and completing, and wherein, after completing primary steam maintenance, opens tarpaulin,
After the steam got rid of in curing pool, then cover tarpaulin, continue steam curing.
D, water supply and air feed maintenance, opened the sealing tarpaulin on curing pool top, arranged by curing pool top
Sprinkler provides the rustization WATER AS FLOW MEDIUM that reaction needs, and each portion temperature in balancing pelletizing layer with this in pelletizing layer
Degree.Force to pelletizing layer internal each to air feed by being arranged on the air-supply arrangement bottom curing pool, it is provided that rustization
The medium oxygen of reaction.Air feed operation is persistently carried out, thus ensures the existence of pelletizing surrounding oxidic atmosphere.Supply
Water operant score completes, in early days can be more to pelletizing layer water supply number of times, it is ensured that the temperature in pelletizing layer is
60 DEG C, pelletizing moisture control is 7wt%.Later stage is lacked some to pelletizing layer water supply number of times or does not supplies water, and protects
Temperature in card pelletizing layer is 40 DEG C.Pelletizing moisture control is 4wt%.
E, pelletizing complete dry run through maintenance in 4 days to pelletizing, can reach the requirement of strength of setting.Screened
After process obtain can be used for big blast furnace freeze off knot rust pellet product.
Table 2: pelletizing molten drop testing inspection result
Table 3: pellet strength testing result
Product checking result is as shown in table 2 and table 3, and the pelletizing melt-dropping property produced is good, beneficially blast furnace
Strengthening smelting, pelletizing comprcssive strength under room temperature state is up to 2110N, and drum strength is 87.87%, pelletizing
Consolidation can be formed within the time of 4 days, with short production cycle.
Embodiment 2:
A kind of production method freezing off knot rust pellet, comprises the following steps:
A. pelletizing make, make pelletizing raw material include the scum magnetic separation iron powder of 50wt%, 49.5wt% red
The magnesium chloride of Iron Ore Powder 2 and 0.5wt%, in scum magnetic separation iron powder, the content of CaO is 5wt%, uses this former
Material and match ratio, TFe=56.07%, MFe=20.25% in compound.Scum magnetic separation iron powder is through being milled to
After 140 mesh, all mix with other raw materials, formed in edge runner mill profit mill mixes and enters roller ball press
The green pellets of 40mmx30mmx20mm (long x width x is high).Described green pellets moisture content 10.5%.Raw
Acid-base value PH=8.2 in pelletizing.
B, pelletizing precuring, the green pellets above-mentioned technique produced is sent in net belt type maintaining machine, the pelletizing bed of material
Thickness 200mm, sends into 40 DEG C of hot-airs, curing time 8h in belt maintaining machine.Pelletizing is after precuring
Moisture 5.8%, initial strength is 160N.Belt maintaining machine uses net belt type maintaining machine.
C, steam curing, be transported to above-mentioned precuring pelletizing in the square curing pool of 10.0 meters of x6.0 rice, ball
Group layer thickness 2500mm.Curing pool top seals with tarpaulin.Steam by being arranged on the conveying bottom curing pool
Vapour device is forced pelletizing is carried out steam curing by convection, and steam pressure is 0.055Mpa, steam temperature
Degree is 95 DEG C, steam-cured time 10h.Now pelletizing layer temperature is 60 DEG C.
Whole steam curing process is divided into 2 times and completing, and wherein, after completing primary steam maintenance, opens tarpaulin,
After the steam got rid of in curing pool, then cover tarpaulin, continue steam curing.
D, water supply and air feed maintenance, opened the sealing tarpaulin on curing pool top, arranged by curing pool top
Sprinkler provides the rustization WATER AS FLOW MEDIUM that reaction needs, and each portion temperature in balancing pelletizing layer with this in pelletizing layer
Degree.Force to pelletizing layer internal each to air feed by being arranged on the air-supply arrangement bottom curing pool, it is provided that rustization
The medium oxygen of reaction.Air feed operation is persistently carried out, thus ensures the existence of pelletizing surrounding oxidic atmosphere.Supply
Water operant score completes, in early days can be more to pelletizing layer water supply number of times, it is ensured that the temperature in pelletizing layer is
65 DEG C, pelletizing moisture control is 6wt%.Later stage is lacked some to pelletizing layer water supply number of times or does not supplies water, and protects
Temperature in card pelletizing layer is 42 DEG C.Pelletizing moisture control is 3.5wt%.
E, pelletizing complete dry run through maintenance in 5 days to pelletizing, can reach the requirement of strength of setting.Screened
After process obtain can be used for big blast furnace freeze off knot rust pellet product.
Table 4: pelletizing molten drop testing inspection result
Table 5: pellet strength testing result
Product checking result is as shown in table 4 and table 5, and the pelletizing melt-dropping property produced is good, beneficially blast furnace
Strengthening smelting, pelletizing comprcssive strength under room temperature state is up to 3369N, and drum strength is 82.56%, pelletizing
Consolidation can be formed within the time of 5 days, with short production cycle.
Embodiment 3:
A kind of production method freezing off knot rust pellet, comprises the following steps:
A. pelletizing make, make pelletizing raw material include the steel scoria magnetic separation iron powder of 60wt%, 39.3wt% red
The magnesium chloride of Iron Ore Powder 1 and 0.7wt%, in steel scoria magnetic separation iron powder, the content of CaO is 6wt%, uses this former
Material and match ratio, TFe=58.58%, MFe=26.00% in compound.Steel scoria magnetic separation iron powder is through being milled to
After 160 mesh, all mix with other raw materials, formed in edge runner mill profit mill mixes and enters roller ball press
The green pellets of 40mmx30mmx20mm (long x width x is high).Described green pellets moisture content 10.8%.Raw
Acid-base value PH=9.8 in pelletizing.
B, pelletizing precuring, the green pellets above-mentioned technique produced is sent in drying grate, pelletizing feed layer thickness
100mm, sends into 30 DEG C of hot-airs, curing time 12h in belt maintaining machine.Pelletizing is moisture after precuring
7%, initial strength is 150N.Belt maintaining machine uses net belt type maintaining machine.
C, steam curing, be transported to above-mentioned precuring pelletizing in the square curing pool of 9.0 meters of x7.0 rice, pelletizing
Layer thickness 800mm.Curing pool top seals with tarpaulin.Fill by being arranged on the conveying steam bottom curing pool
Putting and force by convection pelletizing is carried out steam curing, steam pressure is 0.05Mpa, and vapor (steam) temperature is
100 DEG C, steam-cured time 6h.Now pelletizing layer temperature is 66 DEG C.
Whole steam curing process is divided into 2 times and completing, and wherein, after completing primary steam maintenance, opens tarpaulin,
After the steam got rid of in curing pool, then cover tarpaulin, continue steam curing.
D, water supply and air feed maintenance, opened the sealing tarpaulin on curing pool top, arranged by curing pool top
Sprinkler provides the rustization WATER AS FLOW MEDIUM that reaction needs, and each portion temperature in balancing pelletizing layer with this in pelletizing layer
Degree.Force to pelletizing layer internal each to air feed by being arranged on the air-supply arrangement bottom curing pool, it is provided that rustization
The medium oxygen of reaction.Air feed operation is persistently carried out, thus ensures the existence of pelletizing surrounding oxidic atmosphere.Supply
Water operant score completes, in early days can be more to pelletizing layer water supply number of times, it is ensured that the temperature in pelletizing layer is
65 DEG C, pelletizing moisture control is 5.2wt%.Later stage is lacked some to pelletizing layer water supply number of times or does not supplies water,
Ensure that the temperature in pelletizing layer is 43.5 DEG C.Pelletizing moisture control is 2wt%.
E, pelletizing complete dry run through maintenance in 4 days to pelletizing, can reach the requirement of strength of setting.Screened
After process obtain can be used for big blast furnace freeze off knot rust pellet product.
Table 6: pelletizing molten drop testing inspection result
Table 7: pellet strength testing result
As shown in table 6 and table 7, the pelletizing melt-dropping property produced is good, beneficially blast furnace for Product checking result
Strengthening smelting, pelletizing comprcssive strength under room temperature state is up to 3306N, and drum strength is 81.93%, pelletizing
Consolidation can be formed within the time of 4 days, with short production cycle.
Embodiment 4:
A kind of production method freezing off knot rust pellet, comprises the following steps:
A. pelletizing makes, and the raw material making pelletizing includes the red ferrum of the steel scoria magnetic separation iron powder of 60wt%, 39wt%
The magnesium chloride of breeze 2 and 1wt%, in steel scoria magnetic separation iron powder, the content of CaO is 5.5wt%, uses this raw material
And match ratio, TFe=59.75%, MFe=26.00% in compound.Through all mixing, drying, ball milling
To 150 mesh, compound fine powder is via spiral weighing balance and pre-the adding water of atomized water Control System of Microcomputer composition
Form the pre-wet stock of aqueous 7.5% in balling-up biaxial rneader, and enter formation Ф in disk balling machine
The green pellets of 10-25mm.Described green pellets moisture content 11.0%.Acid-base value PH=7.0 in green pellets.
B, pelletizing precuring, the green pellets above-mentioned technique produced is sent in net belt type maintaining machine, the pelletizing bed of material
Thickness 150mm, sends into 50 DEG C of hot-airs, curing time 24h in belt maintaining machine.Pelletizing is after precuring
Moisture 5%, initial strength is 150N.Belt maintaining machine uses net belt type maintaining machine.
C, steam curing, be transported to above-mentioned precuring pelletizing in the square curing pool of 10.0 meters of x7.0 rice, ball
Group layer thickness 3000mm.Curing pool top seals with tarpaulin.Steam by being arranged on the conveying bottom curing pool
Vapour device is forced pelletizing is carried out steam curing by convection, and steam pressure is 0.04Mpa, steam temperature
Degree is 99 DEG C, steam-cured time 6h.Now pelletizing layer temperature is more than 60 DEG C.
Whole steam curing process is divided into 2 times and completing, and wherein, after completing primary steam maintenance, opens tarpaulin,
After the steam got rid of in curing pool, then cover tarpaulin, continue steam curing.While steam curing,
Force to pelletizing layer internal each to air feed by being arranged on the air-supply arrangement bottom curing pool, it is provided that rustization is reacted
Medium oxygen.
D, water supply and air feed maintenance, opened the sealing tarpaulin on curing pool top, arranged by curing pool top
Sprinkler provides the rustization WATER AS FLOW MEDIUM that reaction needs, and each portion temperature in balancing pelletizing layer with this in pelletizing layer
Degree.Force to pelletizing layer internal each to air feed by being arranged on the air-supply arrangement bottom curing pool, it is provided that rustization
The medium oxygen of reaction.Air feed operation is persistently carried out, thus ensures the existence of pelletizing surrounding oxidic atmosphere.Supply
Water operant score completes, in early days can be more to pelletizing layer water supply number of times, it is ensured that the temperature in pelletizing layer is
62 DEG C, pelletizing moisture control is 5wt%.Later stage is lacked some to pelletizing layer water supply number of times or does not supplies water, and protects
Temperature in card pelletizing layer is 40 DEG C.Pelletizing moisture control is 2.5wt%.
E, pelletizing complete dry run through maintenance in 5 days to pelletizing, can reach the requirement of strength of setting.Screened
After process obtain can be used for big blast furnace freeze off knot rust pellet product.
Table 8: pelletizing molten drop testing inspection result
Table 9: pellet strength testing result
Product checking result is as shown in table 8 and table 9, and the pelletizing melt-dropping property produced is good, beneficially blast furnace
Strengthening smelting, pelletizing comprcssive strength under room temperature state is up to 2280N, and drum strength is 89.15%, pelletizing
Consolidation can be formed within the time of 5 days, with short production cycle.
Claims (8)
1. the production method freezing off knot rust pellet, it is characterised in that comprise the following steps:
A. pelletizing makes, and the raw material making pelletizing includes steel scoria magnetic separation iron powder or the scum magnetic separation of 40-60wt%
Iron powder, the ground hematite of 39-59wt% and the magnesium chloride of 0.5-1wt%, and steel scoria magnetic separation iron powder or scum magnetic separation
Content≤the 6wt% of CaO in iron powder, and the raw material of pelletizing will be made or only by steel scoria magnetic separation iron powder or scum
Magnetic separation iron powder to 120-160 mesh, then utilizes dribbling balling machine or to roller ball press work through ball-milling technology grinding
Skill is fabricated to green pellets, and the water content controlling green pellets is 9-11wt%, and acid-base value pH value is 7-9.8；
B, pelletizing precuring, send into the green pellets made in belt maintaining machine, and pelletizing feed layer thickness is
100-300mm, sends into hot-air or heat smoke, it is ensured that the temperature of the pelletizing bed of material exists in belt maintaining machine
30-50 DEG C, maintenance 8-24h, and control the flow of hot-air or heat smoke, it is ensured that after maintenance, pelletizing is aqueous
Amount is 5-7wt%, the intensity >=150N of single pelletizing；
C, steam curing, send into the pelletizing through precuring in curing pool, and pelletizing feed layer thickness is
800-3000mm, arranges steaming device bottom curing pool and pelletizing carries out steam curing, control the temperature of steam
Degree, it is ensured that temperature >=60 DEG C of the pelletizing bed of material, closes curing pool with tarpaulin above curing pool, steam curing
6-10h；
D, water supply and air feed maintenance, open the tarpaulin above curing pool after steam curing, by being arranged on maintenance
The Sprinkler on top, pond supplies water to the pelletizing bed of material；For while water curing, by being arranged on bottom curing pool
Air-supply arrangement is to pelletizing bed of material air feed, and the water content controlling the pelletizing bed of material is 2-7wt%, temperature >=40 DEG C；
E, through pelletizing precuring, steam curing, water supply and air feed maintenance, altogether after maintenance in 4-5 days, warp
Screening obtains freezing off knot rust pellet.
The production method freezing off knot rust pellet the most according to claim 1, it is characterised in that step a
In, make TFe >=54wt%, MFe >=20wt% in the raw material of pelletizing.
The production method freezing off knot rust pellet the most according to claim 1 and 2, it is characterised in that
Steel scoria magnetic separation iron powder in raw material or TFe >=65wt%, the MFe >=45wt% of scum magnetic separation iron powder.
The production method freezing off knot rust pellet the most according to claim 1, it is characterised in that steam is supported
During protecting, steam is to carry out wet, heat exchange by convection with pelletizing layer, steam pressure >=
0.04Mpa, vapor (steam) temperature is 90-100 DEG C.
The production method freezing off knot rust pellet the most according to claim 1, it is characterised in that whole steaming
Vapour maintenance processes is divided into 2-3 time and completing, and wherein, often completes primary steam maintenance, opens tarpaulin, waits to get rid of
After steam in complete curing pool, then cover tarpaulin, continue steam curing.
The production method freezing off knot rust pellet the most according to claim 1, it is characterised in that whole confession
The process of water curing is divided into first half and latter half, controls the output of Sprinkler, in first half, it is ensured that
The water content of pelletizing is in 5-7wt%, temperature >=60 DEG C of the pelletizing bed of material；In latter half, it is ensured that pelletizing aqueous
Amount is in 2-4wt%, temperature >=40 DEG C of the pelletizing bed of material.
The production method freezing off knot rust pellet the most according to claim 1, it is characterised in that whole steaming
During vapour maintenance and confession water curing, simultaneously by curing pool air supply at the bottom device to pelletizing bed of material air feed.
The production method freezing off knot rust pellet the most according to claim 1, it is characterised in that at pelletizing
During precuring, described belt maintaining machine is preferably net belt type maintaining machine or drying grate.
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| CN106834664B (en) * | 2017-01-10 | 2018-07-17 | 太原钢铁(集团)有限公司 | A method of improving hematite flotation powder ballability |
| CN107988485B (en) * | 2017-12-04 | 2019-12-17 | 钢城集团凉山瑞海实业有限公司 | Quick-drying binder suitable for iron oxide scale cold-pressed pellets and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000256760A (en) * | 1999-03-10 | 2000-09-19 | Kobe Steel Ltd | Production of cold-bond pellet for steelmaking utilizing oil-and iron-containing sludge |
| CN1316531A (en) * | 2001-02-26 | 2001-10-10 | 莱钢集团矿山建设有限公司 | Cold-consolidated rusted cake containing iron dust |
| CN101348861A (en) * | 2008-09-16 | 2009-01-21 | 刘孟 | Curing method of rust bonded pellet |
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2014
- 2014-12-11 CN CN201410764010.2A patent/CN104451137B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000256760A (en) * | 1999-03-10 | 2000-09-19 | Kobe Steel Ltd | Production of cold-bond pellet for steelmaking utilizing oil-and iron-containing sludge |
| CN1316531A (en) * | 2001-02-26 | 2001-10-10 | 莱钢集团矿山建设有限公司 | Cold-consolidated rusted cake containing iron dust |
| CN101348861A (en) * | 2008-09-16 | 2009-01-21 | 刘孟 | Curing method of rust bonded pellet |
Non-Patent Citations (1)
| Title |
|---|
| 冷固结球团直接还原技术及应用;黄柱成;《中国优秀博硕士学位论文全文数据库 (博士) 工程科技Ⅰ辑 》;20041215;第30-31页，第50-55页 * |
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