CN104152611A - Method for reducing alkali metal enrichment in blast furnace - Google Patents
Method for reducing alkali metal enrichment in blast furnace Download PDFInfo
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- CN104152611A CN104152611A CN201410400689.7A CN201410400689A CN104152611A CN 104152611 A CN104152611 A CN 104152611A CN 201410400689 A CN201410400689 A CN 201410400689A CN 104152611 A CN104152611 A CN 104152611A
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Abstract
The invention relates to a method for reducing alkali metal enrichment in a blast furnace. When loads of in-furnace alkali metal oxides are 2.8 to 3.0 kg/t, the blast furnace carries out alkali removing once in each quarter, and the alkali removing period ranges from 15 days to 20 days; in the alkali removing period, the MgO content in slag of the blast furnace is controlled to be 7% to 8%, and the binary basicity of the slag of the blast furnace is controlled not to be larger than 1.15; in the alkali removing period, the temperature of molten iron in the blast furnace is controlled to be 1490 DEG C to 1500 DEG C; the Si content in the molten iron is controlled to be 0.3 percent to 0.35 percent; the Ti content in the molten iron of the blast furnace is controlled to be 0.1 percent to 0.15 percent. The basicity of the slag of the blast furnace is controlled, components and the temperature of the molten iron of the blast furnace are adjusted cooperatively, the discharge rate of the alkali metal is improved, and the alkali metal enrichment is reduced.
Description
Technical field
The present invention relates to blast furnace ironmaking field, be specifically related to a kind of method that reduces basic metal enrichment in blast furnace.
Background technology
In blast furnace ironmaking process, basic metal mineral mainly exist with silico-aluminate and silicate form, and these basic metal mineral fusing points are very low, between 800～1000 ℃, just can melt, while entering high-temperature zone, a part enters slag, and a part is reduced into K, Na element by C.Because the boiling point of metal K, Na only has 799 ℃ and 822 ℃, thereby after restoring, gasify immediately and rise with coal gas, under different temperature condition, be converted into prussiate, fluorochemical and silicate etc. with other substance reaction again, but most of by CO
2be oxidized into carbonate.In the middle cold zone of upper blast furnace, K, Na circulate and enrichment with metal and carbonate form, and the prussiate of K, Na is to circulate and enrichment within the scope of 600～1600 ℃.
Basic metal can reduce the softening temperature of ore, ore is not yet fully reduced and just melt drippage, has increased the direct-reduction heat exhaustion of bottom house; Can cause the abnormal expansion of pellet and serious efflorescence; It can strengthen the gasification reaction ability of coke, and post-reaction strength is sharply reduced and efflorescence; Cause permeability of stock column severe exacerbation, jeopardize production smelting process and carry out; Liquid state or solid base metal adhesion, on furnace lining, can make the serious dross of furnace wall, can directly destroy bricking again, therefore blast furnace ironmaking are caused to very large harm.
Although often alleviate basic metal enrichment by reducing the alkali metal content of feed stock for blast furnace, fuel in prior art, still can cause more serious basic metal enrichment after the long-time use of blast furnace.
Summary of the invention
In order to solve above technical problem, the invention provides a kind of method that reduces basic metal enrichment in blast furnace, by controlling blast-furnace slag basicity and coordinating, adjust blast-melted composition and temperature, improve alkali-metal output, reduce basic metal enrichment.
The present invention is achieved through the following technical solutions:
Reduce a method for basic metal enrichment in blast furnace, blast furnace is when entering stove alkalimetal oxide load at 2.8～3.0kg/t, and per season is arranged alkali once, during row's alkali, is 15～20 days; During row's alkali, controlling MgO content 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 is controlled at 1490 ℃～1500 ℃ scopes; Molten iron si content controls 0.3%～0.35%; Blast-melted is controlled at 0.1%～0.15% containing Ti amount.
In technique scheme, weekly to entering stove crude fuel, slag, gravitational dust collection ash, final dusting is grey and stokehold dedusting ash is carried out sample examination, and carries out basic metal EQUILIBRIUM CALCULATION FOR PROCESS.
The present invention, according to adjusting high fire grate alkali cycle and row's alkali time to entering the observed value of stove alkalimetal oxide load, controls MgO content in blast-furnace slag simultaneously, can reduce K in slag
2o, Na
2o 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 can guarantee can not cause during high fire grate alkali the negative impact of the rising of blast furnace hearth activity variation fuel consumption; Because basicity of slag and the reduction of molten iron si content can cause molten iron reduced viscosity, mobility is improved, circulation aggravation in cupola well; furnace lining is caused to mechanical erosion aggravation, suitably increase the use of titaniferous furnace charge, form high-melting-point TiC and TiCN; be attached on furnace lining, play the effect of protection furnace lining.
Accompanying drawing explanation
The basicity of slag of the blast furnace of use the inventive method that Fig. 1 provides for embodiment of the present invention three phases before row's alkali, after row's alkali phase, row's alkali and always arrange alkali content variation diagram;
The variation diagram of the blast furnace of use the inventive method that Fig. 2 provides for embodiment of the present invention basic metal residual quantity in December in this year and January stove.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.
Within 2014,1 monthly income stove alkalimetal oxide is loaded when 2.75kg/t, high fire grate alkali 18 days.
During row's alkali, controlling MgO content in blast-furnace slag is between 7.45～8.35%, and slag dual alkalinity is not more than 1.15; Blast furnace molten iron temperature during row's alkali is controlled at 1490 ℃～1500 ℃ scopes; Molten iron si content is controlled at 0.31～0.58%; Blast-melted is controlled at 0.1%～0.15% containing Ti amount.
According to before row's alkali, during row's alkali and the division of three phases after row's alkali, successively to entering stove crude fuel stove, slag and stove dirt, sample, slag composition and soda balance calculation result are as shown in table 1, and the alkali load in table and row's alkali content all refer to K
2o and Na
2the summation of O.
Table 1: slag composition and soda balance
The basicity of slag of blast furnace three phases before row's alkali, after row's alkali phase, row's alkali and always arrange alkali content and change as shown in Figure 1.
As can be seen from Figure 1, blast furnace is before row's alkali, and December, average furnace basicity of slag was 1.2; And during row's alkali, i.e. during 1～18 January basicity of slag control lower, average out to 1.15; After row's alkali, within 19 days～31, basicity improves, average out to 1.24.
And that blast furnace is always arranged the Changing Pattern of alkali content is contrary with basicity of slag, before blast furnace is arranged alkali operation, it is 95.79% that 12 monthly average are always arranged alkali content, is less than 100%, explanation is in December, has the basic metal of 0.115kg/t to remain in to circulate in stove enrichment average every day; During row's alkali, downward along with blast furnace basicity, total row's alkali content also improves rapidly, average row's alkali content of 1～18 is 117.7%, be greater than 100%, explanation, during arrange alkali January, can not only be discharged the basic metal being equivalent to into stove alkali load amount, on average can also discharge the residual alkali metal of 0.49kg/t every day more; And after row's alkali, always arrange alkali content to decline gradually along with the readjustment of basicity of slag, after 25 days, come back to below 100%.
As shown in Figure 2, be the variation of blast furnace basic metal residual quantity in December and January stove, because do not carry out tracking sampling to feed stock for blast furnace and ejecta December, the soda balance of every day cannot calculate, and the residual quantity of every day is with replacing when monthly average.
As can be seen from Figure 2, before the operation of the row of taking alkali, the enrichment that all can residual a certain amount of basic metal circulates in blast furnace every day, along with accumulating over a long period, residual alkali metal is more and more.And use method of the present invention to carry out, after high fire grate alkali operation, not only not having every day basic metal residual, and also the basic metal being enriched in blast furnace can be discharged, reach very satisfied row's alkali effect.
By calculating, can learn in addition, whole January, alkali-metal output was 9.254kg/t, and the basic metal of enrichment in December is 3.23kg/t, so with regard to the smelting condition of blast furnace in the present embodiment, for make basic metal in blast furnace no longer enrichment increase, reduce alkali-metal harm, need once arrange for 2～3 months alkali.
It should be noted last that, above embodiment only in order to illustrate this material technology implementation scheme but not restriction, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (2)
1. a method that reduces basic metal enrichment in blast furnace, is characterized in that: blast furnace is when entering stove alkalimetal oxide load at 2.8～3.0kg/t, and per season is arranged alkali once, during row's alkali, is 15～20 days; During row's alkali, controlling MgO content 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 is controlled at 1490 ℃～1500 ℃ scopes; Molten iron si content controls 0.3%～0.35%; Blast-melted is controlled at 0.1%～0.15% containing Ti amount.
2. the method for basic metal enrichment in minimizing blast furnace as claimed in claim 1, is characterized in that: weekly to entering stove crude fuel, slag, gravitational dust collection ash, final dusting is grey and stokehold dedusting ash is carried out sample examination, and carries out basic metal EQUILIBRIUM CALCULATION FOR PROCESS.
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| CN201410400689.7A CN104152611B (en) | 2014-08-14 | 2014-08-14 | A kind of method reducing the enrichment of alkali metal in blast furnace |
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Cited By (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 |
| CN113025768A (en) * | 2021-02-07 | 2021-06-25 | 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2014
- 2014-08-14 CN CN201410400689.7A patent/CN104152611B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (5)
| Title |
|---|
| 彭凤翔等: "攀钢高炉碱金属状态的调查研究", 《钢铁钒钛》 * |
| 欧阳坤等: "高炉中碱金属的研究进展", 《河北理工大学学报（自然科学版）》 * |
| 沈继尧: "《高炉冶炼中的碱金属》", 31 December 1992, 冶金工业出版社 * |
| 王永斌等: "关于低硅生铁冶炼技术的探讨", 《第十七届（2013年）全国冶金反应工程学学术会议论文集》 * |
| 陈艳波等: "高炉碱金属危害分析及其控制方法探讨", 《第十四届全国大高炉炼铁学术年会论文集》 * |
Cited By (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 |
| CN113025768A (en) * | 2021-02-07 | 2021-06-25 | 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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| CN104152611B (en) | 2016-09-14 |
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