CN104911288B - Reduce the blast furnace process lateritic nickel ore method of slag oxidation content of magnesium - Google Patents
Reduce the blast furnace process lateritic nickel ore method of slag oxidation content of magnesium Download PDFInfo
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Abstract
The blast furnace process lateritic nickel ore method of slag oxidation content of magnesium is reduced the invention discloses a kind of.This method is first to be sieved raw material lateritic nickel ore with 25mm, and oversize is carried out broken and sieved with 25mm again, and the lateritic nickel ore that two parts screenings, i.e. granularity are less than 25mm enters the feeding blast furnace process of the sintering deposit after sintering circuit, sintering；In blast furnace process tapping process, steelmaking converter refining reduction slag is sprayed into blast furnace slag and carries out secondary slagging, the straying quatity of steelmaking converter refining reduction slag is less than the 1/12 of blast furnace slag quality.Blast-furnace slag MgO content is effectively down to less than 10% by the present invention by original 16~20%, and can reduce Cr2O3With FeO contents, blast furnace desulfurized effect is improved, is that STEELMAKING PRODUCTION saves lime, reduces the production cost of metallurgical process, it is ensured that steel quality, while the blast furnace slag can be largely used to cement industry, economic benefit and social benefit are notable.
Description
Technical field
The invention belongs to smelting laterite-nickel ores stainless steel field, and in particular to a kind of blast furnace of reduction slag oxidation content of magnesium
Smelting red clay nickel ore method.
Background technology
With China's rapid economic development, the stainless steel demand sustainable growth of nickel purposes 65% is accounted for.Due to China's nickel resources
It is poor, domestic iron and steel enterprises largely from the low-grade smelting ferronickel from red soil nickel ore of external import for stainless steel produce.Laterite
The blast furnace process of nickel minerals is made up of several parts that crush, sinter and smelt of raw material, due to laterite composition and physical features not
General iron ore is same as, the characteristics of sintered material and blast furnace process dispensing of laterite have itself is mainly manifested in sintering deposit
Basicity, blast-furnace coke are when in terms of auxiliary material；For smelting molten iron, knowhow shows nickel-containing molten iron fusing point at 1200 DEG C or so,
It is suitable with regular pig.
Because raw material is limited, the content of MgO in low-grade laterite nickel ore is higher, directly results in blast-furnace slag content of MgO mistake
Height, can cause blast-furnace slag melt temperature and viscosity to rise, and cause conditions of blast furnace fluctuation larger, have when hanging, lubricating substance and pipeline
Occur, had a strong impact on smooth operation of furnace, at the same time, high content of MgO clinker can cause Cr in blast furnace slag2O3And FeO contents compared with
Height, not only reduces slag value, also creates the loss of metal, influence the recovery rate of alloy, while FeO is high in slag, can be right
Desulfurized effect is impacted so that rear process processing cost rise.
Lateritic nickel ore blast furnace process produces a large amount of blast furnace slags, typically prepares Water Quenching Slag by Water Quenching.Water Quenching Slag has
Potential hydraulic gelling property, under clinker, lime, gypsum equal excitation agent effect, can as high-quality cement raw material,
Portland slag cement, gypsum slag cement, latarge cement etc. is made.So, the nuisanceless disposal of Water Quenching Slag mainly leads to
Cross is used to produce slag cements after micro mist processing.
Because content of MgO is higher in Water Quenching Slag, the digestion for seriously constraining Water Quenching Slag in cement industry is used, slag utilization
Value is had a greatly reduced quality, or even because content of MgO is too high, addition is extremely limited, and it is excellent that micro mist producer does not possess cost using slag
Gesture and abandon using, while economic loss is brought to enterprise, surrounding enviroment can also be caused with serious pollution.
To ensure smooth operation of furnace, production cost is reduced, recovery rate of iron is improved, mitigates environmental protection pressure, optimizes blast furnace slag type,
Content of MgO in clinker is reduced, use ratio of the increase clinker in cement manufacture is urgent need to resolve technical problem.
The content of the invention
The technical problems to be solved by the invention are to reduce the content of magnesia of clinker in blast furnace process lateritic nickel ore, so that
The problems such as working of a furnace caused due to content of magnesia height is unstable, metal loss is serious, production cost is high is avoided, blast furnace slag is improved
In the consumption of cement industry, mitigate the environmental protection pressure that blast furnace slag is produced.
The present invention is by analyzing CaO-MgO-SiO2-Al2O3Quarternary phase diagram, considers cinder viscosity, fusing point, Sulfur capacity, stream
Dynamic property and stability, low-grade laterite nickel ore blast furnace smelting slag should possess following condition：Clinker dual alkalinity is in 0.8-0.9
Between, Al in clinker2O3Content is controlled within 20%, and the chemical stability of clinker will get well, while requiring MgO controls in 8-
Between 10%, clinker ore deposit is set mutually to maintain melilite, in manganolite region, to ensure that slag melting is fluctuated with composition transfer
Minimum, and flux is incorporated less as far as possible, reach the requirement of few quantity of slag.
Operationally, reasonable screening is taken to lateritic nickel ore raw material, specially treated is carried out to low-grade lump ore, by changing
Having become raw material spice, sintered material and shaft furnace charging system ensures content of MgO control in 8%-10% or so.Go out simultaneously in blast furnace
The outer slagging reaction of secondary stove is carried out during slag, low MgO, high CaO, the steelmaking converter refining reduction of natural degradation fine size is added
Slag, refining reduction slag is not more than 1 with blast furnace slag mixed proportion:12, secondary slagging is swift in response, and works well.
Through aforesaid operations, blast-furnace slag MgO content is effectively down to less than 10%, clinker by original 16-20%
Middle Cr2O31%-1.5% is reduced to by original 2%-3%, FeO contents in clinker are significantly reduced, blast furnace desulfurization is improved
Effect, is that STEELMAKING PRODUCTION saves lime, reduces the production cost of metallurgical process, it is ensured that steel quality, be each of subsequent production
Item index, consumption, which improve, provides raw material basis, remarkable in economical benefits.Clinker MgO content reduction, dramatically increases blast-furnace slag
Usage amount in cement manufacturing industry, the raising of lifting, blast furnace target improvement and yield of alloy to clinker value rises
To important function.
The technical solution adopted for the present invention to solve the technical problems is：The blast furnace process for reducing slag oxidation content of magnesium is red
Native nickel minerals method, including raw material lateritic nickel ore is broken, the process of sintering and blast furnace process, is sieved after raw material lateritic nickel ore is broken
Point, the lateritic nickel ore that granularity is less than 25mm enters sintering circuit.
Lateritic nickel ore wherein of the present invention is primarily referred to as low-grade lateritic nickel ore, and grade is 0.8~1.5%.
Wherein the present invention no longer admixes light dolomite in the lateritic nickel ore of sintering circuit.
Wherein, in the above method, first raw material lateritic nickel ore is sieved with 25mm, oversize is crushed and used again
25mm is sieved, and the lateritic nickel ore that two parts screenings, i.e. granularity are less than 25mm enters sintering circuit.
Wherein, in the above method, in the sintering deposit that sintering circuit is obtained, content of MgO 2~3%.
Wherein, in above method blast furnace process tapping process, steelmaking converter refining reduction slag is sprayed into (i.e. not into blast furnace slag
Steel smelting AOD furnace of becoming rusty slag) secondary slagging is carried out, the straying quatity of steelmaking converter refining reduction slag is less than the 1/12 of blast furnace slag quality.
Wherein, in the above method, in the blast furnace slag obtained after blast furnace process, content of MgO 8~10%.
Wherein, in the above method, the blast furnace slag dual alkalinity 0.8~0.9 obtained after blast furnace process, Al in clinker2O3Content
Within 20%.
Wherein, in the above method, the steelmaking converter refining reduction slag content of MgO be less than 8%, CaO mass contents 45~
55%.
The wherein present invention signified MgO, Al2O3, CaO content be mass content.
The beneficial effects of the invention are as follows：Inventor has found that low-grade lateritic nickel ore exists in screening and shattering process
Part lump ore, these lump ores are difficult to crush, and major part MgO is concentrated in these lump ores in lateritic nickel ore, MgO in lump ore,
SiO2、Al2O3Content is 20%~30%, or even up to more than 30%, and these lump ores in the former technique of applicant are obtained through broken
Admixed after obtaining certain particle size in raw materials for sintering, larger thus is influenceed on blast furnace slag composition, is unfavorable for the direct motion of blast furnace, thus applies
People will be difficult to broken lump ore and sieve removing, reduce the content of MgO of blast furnace slag.In addition, secondary slagging outside the stove that the present invention is carried out
Reaction, can make full use of the heat of blast furnace slag, add a certain proportion of low MgO, high CaO, natural degradation fine size, with good
The steelmaking converter refining reduction slag of good slagging reaction interface, can reduce blast furnace slag melting point, improve its mobility, and slugging is good,
Melt rapid, and further reduce content of magnesia in blast furnace slag.By above-mentioned measure, the present invention is effectively by blast furnace
Clinker MgO content is down to Cr in less than 10%, clinker by original 16~20%2O31 is reduced to by original 2~3%~
1.5%, FeO contents in clinker are significantly reduced, blast furnace desulfurized effect is improved, is that STEELMAKING PRODUCTION saves lime, reduces
The production cost of metallurgical process, it is ensured that steel quality, improves for the indices of subsequent production, consumption and provides raw material basis,
Remarkable in economical benefits.Clinker MgO content reduction, dramatically increases usage amount of the blast-furnace slag in cement manufacturing industry, to clinker
The raising of the lifting of value, blast furnace target improvement and yield of alloy plays an important role, and also solves part refining also
Former slag muck puts the serious environmental issue of difficult, airborne dust.
Brief description of the drawings
Fig. 1 is MgO and Cr in embodiment blast furnace slag2O3Changes of contents curve；
Fig. 2 is Al2O3The CaO-MgO-SiO of content 20%2-Al2O3Quarternary phase diagram；
Fig. 3 is the CaO-MgO-SiO of content of MgO 5%, 10% and 15%2-Al2O3Phasor.
Embodiment
Technical principle：
CaO-MgO-SiO as shown in Figure 22-Al2O3In quaternary system, Al2O3When content is 20%, with dual alkalinity liter
Height, liquidus temperature rise；Content of MgO is interval 5%~20%, as MgO is raised, after the interval first increase of 1400 DEG C of liquidus curves
Reduce, after content of MgO is more than 13%, slag melting is more than 1500 DEG C, influence will be brought on smelting direct motion.
CaO-MgO-SiO as shown in Figure 32-Al2O3In quaternary system, MgO increases to 10%, 1500 DEG C by 5% in clinker
Liquid phase region increases, and shows that slag melting has risen, but MgO is reduced liquid phase region when continuing to increase to 15%, 1600 DEG C of liquid phase regions
Increase, slag melting rises substantially, therefore MgO plays the interval of good action about between 5%~15% in blast furnace finishing slag.
MgO addition mainly produces influence to the viscosity of clinker, with Al2O3When reaching certain content, MgO presence
Energy and Al2O3, SiO2, silicate reaction generates a series of low-melting compounds, has viscosity and ensure certain in certain decline, slag
Metallurgical performance liftings of the MgO of amount to clinker provides dynamic conditions.But in clinker content of MgO increase so that containing aerobic
Change the mineral facies of magnesium：Such as monticellite, magnesium scapolite and manganolite increase.In melilite domain, the melting of clinker, stream
Dynamic property and stability are all relatively better, from CaO-MgO-SiO2-Al2O3Seen in quaternary system phasor, blast furnace slag composition should be selected as far as possible
In melilite region, i.e., MgO should try one's best control 10% or so in clinker, no more than 12%.
Clinker Sulfur capacity CSWith basicity R2Improve and increase, laboratory data analyze learn, MgO in the range of 5%~18%,
Clinker sulfur capacity first increases to be reduced afterwards, and sulfur capacity reaches maximum when MgO is 8%, the problem of where there is a contradiction, i.e. R2
Rise, slag liquidus temperature rises, and the result brought is that flux consumption rises, energy consumption rises, but Sulfur capacity is accordingly raised, in order to
The Sulfur capacity for maintaining clinker good, and ensure the mobility of clinker, consider from MgO directions, should try one's best and MgO controls in clinker exist
8~10% scopes, this slag type has reasonable viscosity, slag temperature stabilization, operates easy advantage, once and composition transfer, stove
Temperature fluctuation, this slag can maintain stable cupola well thermal system, be the smelting low-sulfur pig iron still in melilite, manganolite region
Create good condition.
Therefore, the present invention is by analyzing CaO-MgO-SiO2-Al2O3Quarternary phase diagram, considers cinder viscosity, fusing point, sulphur
Appearance, mobility and stability, it is optimal that low-grade laterite nickel ore blast furnace smelting slag should possess following condition：Clinker dual alkalinity is
Between 0.8~0.9, Al in clinker2O3Content is controlled within 20% in principle, and the chemical stability of clinker will get well, and simultaneously
Ask MgO controls between 8~10%, clinker ore deposit is mutually maintained melilite, in manganolite region, to ensure slag melting
Minimum is fluctuated with composition transfer, and is incorporated flux less as far as possible, the requirement of few quantity of slag is reached.Among these, blast furnace slag content of MgO is controlled
It is that difficult point is also crucial between 8~10%.
Blast furnace process lateritic nickel ore reduces clinker content of MgO, can increase the consumption of the required blast furnace slag of production cement.Carrying
Advocate the modern society of recycling economy, the efficient utilization of resource, recycle with hamlessizing technology be Future Development inexorable trend.
To high energy consumption, the steel industry of high pollution, efficiently, economical, to recycle discarded object imperative.Ground granulated blast furnace slag has
The potential hydraulicity, is the high-quality mixing material of cement and concrete, and with low cost, solves the advantages such as environmental issue.
Nearly ten years, the super granulated ground blast-furnace slag of China as cement, concrete and mortar admixture, for improving and improving
The application of cement concrete performance is more and more extensive, in practice it has proved that using effect is good.
Provided according in standard GB/T 12958-1999 composite Portland cements, MgO≤5.0% is required in clinker.It is logical
Cross process optimization reduction blast furnace process lateritic nickel ore slag in content of MgO so that blast-furnace slag content of MgO by original more than 20%,
It is reduced within 10%, greatly increases the consumption of the required blast furnace slag of production cement, realize recycling for discarded object.For
Cement producer, can both make mixing material production composite Portland cement with ferronickel slag, and ferronickel slag introducing MgO can also be used and makees mineralizer
Carry out calcination of cement clinker in incorporation raw material.
In summary, realize that blast furnace slag type optimizes, content of MgO in reduction clinker, to ensureing smooth operation of furnace, reduction is produced into
This, improves recovery rate of iron, mitigates environmental protection pressure, improves blast-furnace cinder application percentage in cement industry, it will play very
Good effect.
In order to achieve the above object, the present invention takes following measures：
Reduce the blast furnace process lateritic nickel ore method of slag oxidation content of magnesium, including raw material lateritic nickel ore is broken, sintering and
The process of blast furnace process, is sieved, the lateritic nickel ore that granularity is less than 25mm just enters agglomerant after raw material lateritic nickel ore is broken
Sequence.
In addition, the present invention no longer admixes light dolomite in the lateritic nickel ore of sintering circuit.
Furthermore, the present invention sprays into steelmaking converter refining reduction slag (i.e. not in blast furnace process tapping process into blast furnace slag
Steel smelting AOD furnace of becoming rusty slag) secondary slagging is carried out, the straying quatity of steelmaking converter refining reduction slag is less than the 1/12 of blast furnace slag quality.
It is preferred that, in order to reduce comminution energy conssumption, the present invention first sieves raw material lateritic nickel ore with 25mm that (aperture is 25mm's
Sieve) sieved, oversize is carried out broken and sieved with 25mm again, and two parts screenings, i.e. granularity are less than 25mm's
Lateritic nickel ore enters sintering circuit.
Wherein, the present invention is in the sintering deposit that sintering circuit is obtained, content of MgO 2~3%.
Wherein, in the blast furnace slag that the present invention is obtained after blast furnace process, content of MgO 8~10%.
Wherein, Al in the blast furnace slag dual alkalinity 0.8~0.9 obtained after blast furnace process of the present invention, clinker2O3Content exists
Within 20%.
It is preferred that, steelmaking converter refining reduction slag content of MgO of the present invention be less than 8%, CaO mass contents 45~
55%.
The embodiment of the present invention is described further below by embodiment, but not therefore by the present invention
Protection domain limitation in one embodiment.
Embodiment
Applicant is progressively improved, first under the thinking described in embodiment to production blast furnace smelting process
Since material process, specially treated is carried out to low-grade ore.We are by raw ore screening process, and granularity is more than more than 25mm
And the raw ore that can not further crush is referred to as lump ore.In view of content of MgO is high in the chemical composition of lump ore and granularity fluctuation range is big,
In actual screening process, it is 150mm, 50mm and 25mm sieve that aperture is chosen respectively, and lump ore is screened out to come.Screen out and come not
One-size lump ore obtains the available broken powder of sintering respectively through coarse broken, the broken, thin broken and granularity is more than 25mm lump ore, by institute
The lateritic nickel ore for having granularity to be less than 25mm is sent to sintering circuit.In sintered material, applicant abandons using light dolomite,
Reason be it is found by the applicant that light dolomite digestion process heat production itself is few, it is very limited to raw material drying effect, to smelting
Journey also results in certain passive.Carried out in the sintering deposit feeding blast furnace process produced after sintering, blast furnace ironmaking process secondary outside stove
Into Slag treatment, i.e., steelmaking converter refining reduction slag is sprayed into blast furnace slag, the straying quatity of steelmaking converter refining reduction slag is less than height
The 1/12 of clinker quality.Add after the reducing slag, the fusing point reduction of clinker, slugging is good, and slagging is swift in response, good fluidity,
Further reduce content of magnesia in blast furnace slag.
After applicant progressively improves according to the inventive method, content of magnesia is also reduced month by month in blast furnace slag, such as table 1 and figure
Shown in 1.
The blast furnace slag composition situation of change table (%) of table 1
| Month | Cr2O3 | SiO2 | FeO | Al2O3 | CaO | MgO | MnO | Remarks |
| 2 months | 2.98 | 27.27 | 3.15 | 21.35 | 23.65 | 16.69 | 0.97 | |
| March | 2.07 | 32.12 | 2.22 | 15.56 | 26.77 | 16.68 | 1.03 | |
| April | 2.30 | 30.87 | 2.78 | 18.81 | 25.94 | 14.16 | 1.49 |
| May | 1.79 | 29.40 | 2.1 | 19.90 | 29.03 | 12.25 | 1.47 | |
| June | 1.54 | 29.31 | 1.88 | 20.73 | 30.93 | 9.29 | 1.71 | |
| July | 1.27 | 30.70 | 1.54 | 19.47 | 31.54 | 9.90 | 1.50 | |
| August | 1.29 | 29.43 | 1.70 | 19.99 | 30.91 | 9.10 | 1.47 | |
| September | 1.77 | 29.72 | 2.14 | 19.73 | 29.34 | 9.22 | 1.76 | Enter stove Cr grades high |
Claims (4)
1. the blast furnace process lateritic nickel ore method of slag oxidation content of magnesium is reduced, including raw material lateritic nickel ore is crushed, sintered and high
The process that stove is smelted, it is characterised in that：Sieved after raw material lateritic nickel ore is broken, the lateritic nickel ore that granularity is less than 25mm enters
Sintering circuit；Lateritic nickel ore grade 0.8~1.5%；In the sintering deposit that sintering circuit is obtained, content of MgO 2~3%；Blast furnace process
In tapping process, the secondary slagging of steelmaking converter refining reduction slag progress is sprayed into blast furnace slag, steelmaking converter refining reduction slag
Straying quatity is less than the 1/12 of blast furnace slag quality；In the blast furnace slag obtained after blast furnace process, content of MgO 8~10%.
2. the blast furnace process lateritic nickel ore method of reduction slag oxidation content of magnesium according to claim 1, it is characterised in that：
First raw material lateritic nickel ore is sieved with 25mm, oversize is carried out broken and sieved with 25mm again, two parts sieve
The lateritic nickel ore that lower thing, i.e. granularity are less than 25mm enters sintering circuit.
3. the blast furnace process lateritic nickel ore method of reduction slag oxidation content of magnesium according to claim 1, it is characterised in that：
Al in the blast furnace slag dual alkalinity 0.8~0.9 obtained after blast furnace process, clinker2O3Content is within 20%.
4. the blast furnace process lateritic nickel ore method of reduction slag oxidation content of magnesium according to claim 1, it is characterised in that：
The steelmaking converter refining reduction slag content of MgO is less than 8%, CaO mass contents 45~55%.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733950A (en) * | 2005-09-16 | 2006-02-15 | 刘沈杰 | Ferronickel smelting process of nickel oxide ore free of crystal water in blast furnace |
| CN102108438A (en) * | 2011-02-12 | 2011-06-29 | 西安建筑科技大学 | Method for producing pellets from laterite-nickel ore |
| CN103556068A (en) * | 2013-11-14 | 2014-02-05 | 德龙钢铁有限公司 | Method for producing weather-resisting steel by using low-grade nickel ores |
-
2015
- 2015-04-14 CN CN201510174993.9A patent/CN104911288B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733950A (en) * | 2005-09-16 | 2006-02-15 | 刘沈杰 | Ferronickel smelting process of nickel oxide ore free of crystal water in blast furnace |
| CN102108438A (en) * | 2011-02-12 | 2011-06-29 | 西安建筑科技大学 | Method for producing pellets from laterite-nickel ore |
| CN103556068A (en) * | 2013-11-14 | 2014-02-05 | 德龙钢铁有限公司 | Method for producing weather-resisting steel by using low-grade nickel ores |
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