CN104152611B - A kind of method reducing the enrichment of alkali metal in blast furnace - Google Patents
A kind of method reducing the enrichment of alkali metal in blast furnace Download PDFInfo
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- CN104152611B CN104152611B CN201410400689.7A CN201410400689A CN104152611B CN 104152611 B CN104152611 B CN 104152611B CN 201410400689 A CN201410400689 A CN 201410400689A CN 104152611 B CN104152611 B CN 104152611B
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Abstract
The present invention relates to a kind of method reducing the enrichment of alkali metal in blast furnace, blast furnace is when entering stove alkali metal oxide load in 2.8～3.0kg/t, and quarterly row's alkali is once, is 15～20 days during row's alkali；During row's alkali, controlling content of MgO in blast-furnace slag is 7%～8%, and slag dual alkalinity is not more than 1.15；Blast furnace molten iron temperature during row's alkali controls 1490 DEG C～1500 DEG C of scopes；Molten iron si content controls 0.3%～0.35%；The blast-melted amount containing Ti controls 0.1%～0.15%.The present invention, by controlling blast-furnace slag basicity and coordinating the blast-melted composition of adjustment and temperature, improves alkali-metal output, reduces alkali metal enrichment.
Description
Technical field
The present invention relates to blast furnace ironmaking field, be specifically related to a kind of side reducing the enrichment of alkali metal in blast furnace
Method.
Background technology
During blast furnace ironmaking, alkali metal mineral mainly exist with aluminosilicate and silicate form,
These alkali metal mineral fusing points are the lowest, just can melt between 800～1000 DEG C, when entering high-temperature region,
Being partly into slag, a part is then reduced into K, Na element by C.Due to metal K, Na
Boiling point only has 799 DEG C and 822 DEG C, thus gasifies immediately after restoring and rise with coal gas, different
It is converted into cyanide, fluoride and silicate etc. with other substance reaction again under temperature conditions, but most of
By CO2It is oxidized into carbonate.At the middle low-temperature space of upper blast furnace, K, Na are with metal and carbonate
Form is circulated and is enriched with, and the cyanide of K, Na is then to follow in the range of 600～1600 DEG C
Ring and enrichment.
Alkali metal can reduce the softening temperature of Ore, makes Ore the most fully reduce and has the most melted drippage,
Add the direct-reduction heat consumption of bottom house；The abnormal expansion of pellet can be caused and serious powder
Change；It can strengthen the gasification reaction ability of coke, makes post reaction strength drastically reduce and efflorescence；Cause
Permeability of stock column severe exacerbation, jeopardizes production smelting process and carries out；Liquid or solid base metal adhesion in
On furnace lining, the serious dross of furnace wall can be made, can directly destroy bricking again, therefore blast furnace ironmaking be caused very
Big harm.
Although prior art alleviates alkali gold usually through minimizing feed stock for blast furnace, the alkali metal content of fuel
Belong to enrichment, but blast furnace still results in after using for a long time than more serious alkali metal enrichment.
Summary of the invention
In order to solve above technical problem, the present invention provides a kind of and reduces the side of alkali metal enrichment in blast furnace
Method, by controlling blast-furnace slag basicity and coordinating the blast-melted composition of adjustment and temperature, improves alkali gold
The output belonged to, reduce alkali metal enrichment.
The present invention is achieved through the following technical solutions:
A kind of method reducing the enrichment of alkali metal in blast furnace, blast furnace exists entering stove alkali metal oxide load
When 2.8～3.0kg/t, quarterly row's alkali is once, is 15～20 days during row's alkali；During row's alkali, control
In blast-furnace slag processed, content of MgO is 7%～8%, and slag dual alkalinity is not more than 1.15；Blast furnace is row
During alkali, molten iron temperature controls 1490 DEG C～1500 DEG C of scopes；Molten iron si content controls
0.3%～0.35%；The blast-melted amount containing Ti controls 0.1%～0.15%.
In technique scheme, weekly to entering stove crude fuel, slag, gravitational dust collection ash, secondary removes
Dirt ash and stokehold dedusting ash are sampled chemical examination, and carry out alkali metal EQUILIBRIUM CALCULATION FOR PROCESS.
The present invention adjusts high fire grate alkali cycle and row according to the measured value entering stove alkali metal oxide load
The alkali time, control content of MgO in blast-furnace slag, it is possible to decrease K in slag simultaneously2O、Na2O activity,
Therefore MgO increases in slag, row's alkali content improves；During row's alkali, by the adjustment to blast furnace thermal system,
Suitably reduce blast-melted temperature, reduce Si content, but will not make during can ensure that high fire grate alkali
Become the negative effect of the rising of blast furnace crucibe activity variation fuel consumption；Due to basicity of slag and molten iron
Si content reduction can cause molten iron viscosity to reduce, and mobility is improved, and circulation aggravation in cupola well, to furnace lining
Cause mechanical erosion to aggravate, suitably increase the use of titaniferous furnace charge, form high-melting-point TiC and TiCN,
It is attached on furnace lining, plays the effect of protection furnace lining.
Accompanying drawing explanation
The blast furnace of use the inventive method that Fig. 1 provides for the embodiment of the present invention row alkali before, row the alkali phase,
The basicity of slag of three phases and total row's alkali content variation diagram after row's alkali；
The blast furnace of use the inventive method that Fig. 2 provides for the embodiment of the present invention is at December and 1 in this year
The variation diagram of alkali metal residual quantity in month stove.
Detailed description of the invention
With embodiment, technical scheme is described in detail below in conjunction with the accompanying drawings.
Within 2014,1 monthly income stove alkali metal oxide load is when 2.75kg/t, high fire grate alkali 18 days.
During row's alkali, controlling content of MgO in blast-furnace slag is between 7.45～8.35%, slag two
Unit's basicity is not more than 1.15；Blast furnace molten iron temperature during row's alkali controls 1490 DEG C～1500 DEG C of scopes；
Molten iron si content controls 0.31～0.58%；The blast-melted amount containing Ti controls 0.1%～0.15%.
According to before row's alkali, during row's alkali and the division of three phases after row's alkali, successively to entering the former combustion of stove
Material stove, slag and stove dirt are sampled, and slag composition and soda balance result of calculation are as shown in table 1, table
In alkali load and row alkali content refer both to K2O and Na2The summation of O.
Table 1: slag composition and soda balance
Blast furnace before row's alkali, row's alkali phase, the basicity of slag of three phases and total row's alkali content change after row's alkali
As shown in Figure 1.
From figure 1 it appears that blast furnace is before row's alkali, December average furnace basicity of slag is 1.2；And
During row's alkali, i.e. during January 1～18 days, basicity of slag controls relatively low, average out to 1.15；Row
After alkali, i.e. 19 days～basicity raising on the 31st, average out to 1.24.
And the Changing Pattern that alkali content always arranged by blast furnace is contrary with basicity of slag, before blast furnace carries out arranging alkali operation,
It is 95.79% that 12 monthly average always arrange alkali content, less than 100%, illustrates at December, and average every day is all
The alkali metal having 0.115kg/t is circulated enrichment in remaining in stove；During row's alkali, along with blast furnace alkali
The downward of degree, total row's alkali content improves the most rapidly, and average row's alkali content of 1 day～18 days is 117.7%, greatly
In 100%, illustrate during January arranges alkali, the alkali be equivalent to into stove alkali load amount can not only be discharged
Metal, can also discharge the residual alkali metal of 0.49kg/t average every day more；And after row's alkali, always arrange
Alkali content is gradually reduced along with the readjustment of basicity of slag, come back to after 25 days 100% with
Under.
As in figure 2 it is shown, the change of alkali metal residual quantity in December and January stove that is blast furnace, by
Not having in December and feed stock for blast furnace and ejection are tracked sampling, the soda balance of every day cannot be counted
Calculate, then the residual quantity of every day then replaces with when monthly average.
From figure 2 it can be seen that before the row's of taking alkali operation, every day all can remain a certain amount of alkali
Metal is circulated enrichment in blast furnace, and along with accumulating over a long period, residual alkali metal gets more and more.And make
After carrying out the operation of high fire grate alkali by the method for the present invention, alkali metal is not only had every day to remain, also can be by
The alkali metal being enriched in blast furnace is discharged, and reaches the row's alkali effect being satisfied with very much.
Additionally by calculating it is known that alkali-metal output in whole January is 9.254kg/t, and
The alkali metal of December enrichment is 3.23kg/t, so for the smelting condition of blast furnace in the present embodiment,
In order to make the alkali metal in blast furnace no longer be enriched with increase, reduce alkali-metal harm, need 2～enter for 3 months
Row once arranges alkali.
It should be noted last that, above example only in order to the technology implementation scheme of this material to be described and
Unrestricted, although the present invention being described in detail with reference to preferred embodiment, the common skill of this area
Art personnel should be appreciated that and can modify technical scheme or equivalent, and not
Departing from the spirit and scope of technical solution of the present invention, it all should be contained in scope of the presently claimed invention
In the middle of.
Claims (1)
1. one kind is reduced the method for alkali metal enrichment in blast furnace, it is characterised in that: blast furnace is entering stove alkali gold
Genus oxide load is when 2.8～3.0kg/t, and quarterly row's alkali is once, is 15～20 days during row's alkali；
During row's alkali, controlling content of MgO in blast-furnace slag is 7%～8%, and slag dual alkalinity is little
In 1.15；Blast furnace molten iron temperature during row's alkali controls 1490 DEG C～1500 DEG C of scopes；Molten iron contains
Si amount controls 0.35%；The blast-melted amount containing Ti controls 0.15%；Weekly to enter stove crude fuel,
Slag, gravitational dust collection ash, final dusting ash and stokehold dedusting ash are sampled chemical examination, and carry out alkali gold
Belong to EQUILIBRIUM CALCULATION FOR PROCESS.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561410A (en) * | 2015-01-21 | 2015-04-29 | 首钢总公司 | Method for preventing high-alkali ore powder for blast furnaces from causing alkali metal circulating enrichment |
| CN110724778A (en) * | 2019-10-18 | 2020-01-24 | 酒泉钢铁(集团)有限责任公司 | Smelting method for efficiently discharging alkali metal in blast furnace |
| CN112280915A (en) * | 2020-10-09 | 2021-01-29 | 新疆八一钢铁股份有限公司 | Iron-making method by using high-zinc magnetite ore blending |
| CN113025768B (en) * | 2021-02-07 | 2022-10-21 | 首钢集团有限公司 | Blast furnace alkali-discharging method |
| CN114774600A (en) * | 2022-04-27 | 2022-07-22 | 日照钢铁控股集团有限公司 | Process method for centralized alkali discharge of blast furnace |
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| CN101597659A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | Simulation basic metal is at the test method and the device thereof of blast furnace circulating enrichment discipline |
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| CN101597659A (en) * | 2009-07-03 | 2009-12-09 | 首钢总公司 | Simulation basic metal is at the test method and the device thereof of blast furnace circulating enrichment discipline |
| CN102183477A (en) * | 2010-12-13 | 2011-09-14 | 河北省首钢迁安钢铁有限责任公司 | Method for simulation test of influence of alkali metal on coke degradation |
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