CN104342530A - A method for producing stainless molten iron by taking fly ash as raw material - Google Patents
A method for producing stainless molten iron by taking fly ash as raw material Download PDFInfo
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- CN104342530A CN104342530A CN201410166053.0A CN201410166053A CN104342530A CN 104342530 A CN104342530 A CN 104342530A CN 201410166053 A CN201410166053 A CN 201410166053A CN 104342530 A CN104342530 A CN 104342530A
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- dedusting ash
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Abstract
The invention relates to a method for producing stainless molten iron by taking fly ash as raw material. The method comprises the following steps in order: material mixing, ball pressing or agglomeration, burdening, smelting, molten iron discharging, molten iron ingoting and slag granulating. The method is characterized in that, while smelting, the furnace is charged in the following order: slag, foundry coke, pelletizing block or prismatic block, pestling coke and coke flux. The method for producing stainless molten iron by taking fly ash as raw material partially replaces the foundry coke with the pestling coke, realizing utilization of the pestling coke in an oxygen-enriched shaft furnace. Normally, 50 % of the pestling coke is used to replace the foundry coke, so that the cost of a ton of iron is reduced by 86.3 yuan RMB, yielding good economic benefit. The method improves the atmosphere within the furnace, reduces the coke ratio and improves the m etal recovery in the oxygen-enriched shaft furnace by 1.15 %.
Description
Technical field
The present invention relates to a kind of method that dedusting ash is the stainless molten iron of raw material production.
Background technology
Foundry coke is the coke being specifically designed to casting smelting, is the main fuel of cupola furnace molten iron.Its effect is melting batch and makes molten iron overheated, supports the ventilation property that stock column keeps it good.Therefore, foundry coke should possess that lumpiness is large, reactivity is low, void content is little, have the features such as enough shock resistance crushing strength, ash content and sulphur content are low.
With oxygen enrichment shaft furnace Scrap Smelting, the cast iron that production added value is high, coke ratio is far below blast furnace, and shared by coke, production cost ratio is lower.
And comparatively breeze is low to utilize the metal content of iron content dedusting ash, about being about the half of breeze iron-holder, this just causes feed grade low, the quantity of slag is large, is about the twice of ordinary blast, causes oxygen enrichment shaft furnace iron coke per ton ratio high, the molten iron inferior quality simultaneously produced, sulfur-bearing, phosphorus are higher, and added value is low, and therefore coke cost accounts for proportion comparatively large (about 40%) left and right of oxygen enrichment shaft furnace production cost.
Therefore utilizing dedusting ash as iron-smelting raw material, with foundry coke be reductive agent oxygen enrichment shaft furnace in, the consumption of foundry coke must be reduced or use other substitute.
Summary of the invention
In order to overcome the above-mentioned deficiency that existing dedusting ash is the method for the stainless molten iron of raw material production, the invention provides a kind of cost low take dedusting ash as the method for the stainless molten iron of raw material production.
Design of the present invention is
Oxygen enrichment shaft furnace is mainly for the production of cast iron, and require higher to final cast iron composition, metallographic, be mingled with etc., therefore the specification of quality of coke is high; With oxygen enrichment shaft furnace with chromium, nickel dedusting ash smelt in the process of stainless molten iron for raw material, the stainless molten iron produced is mainly in alloy mode as steelmaking feed, pre-treatment can be carried out before steel-making is smelted, therefore suitably can reduce the requirement of the raw material (molten iron or cast iron) of steel-making, thus reduce production cost.
Domestic stamp-charging coke void content is 40 ~ 45%, and foundry coke void content requires 35 ~ 40%, and exports foundry coke requirement about 30%.The height of coke crackle degree and void content, has direct relation with coking coal used, as with bottle coal for the main coke refined, crackle is many, and void content is high, and intensity is low; And the coke crackle that coal refines based on coking coal is few, void content is low, intensity is high, the height of void content, depends on coal used to a great extent.
Therefore optional is that Jiao that fiddles with of the production of raw material can Some substitute foundry coke (substitution rate 40 ~ 50%) in order to coking coal, smelts chromium, ferronickel water.
1, use in the molten burnt process before blow-on and fiddle with Jiao, for toasting resistance to material:
Preparation before blow-on mainly improves in-furnace temperature, toasts resistance to material, therefore uses stamp-charging coke to substitute the operation that foundry coke does not affect smelting.
2, fill bed coke and use 100% foundry coke
Bed coke burning is the basic source of oxygen enrichment shaft furnace heat, is the key factor controlling furnace temperature, decides furnace gas temperature, therefore use 100% foundry coke.
3, loading sequence is changed
The loading sequence of 100% foundry coke is used to be: slag steel+carbon brick+foundry coke+flux
Use part fiddles with burnt loading sequence: slag steel+foundry coke+carbon brick+fiddle with Jiao+flux
Loading sequence after improving, layer part is more even, gives full play to the carrying out utilizing reduction reaction of coke, " burnt window " effect of more outstanding coke, be beneficial to the utilization ratio improving coke, achieve the target fiddling with burnt Some substitute foundry coke, reduce production cost.
This dedusting ash is that the method that raw materials for metallurgy produces stainless molten iron comprises following step successively: batch mixing, pressure ball or agglomeration, batching, smelting, molten iron discharging and molten iron ingot bar and slag particle, it is characterized in that the order of shove charge is when smelting; First slag steel, the second foundry coke, the 3rd pelletizing block or prism block, the 4th stamp-charging coke, the 5th flux.
Say in detail, above-mentioned dedusting ash is the method for the stainless molten iron of raw material production, and its steps characteristic is:
ibatch mixing
Adopt three assembly of following raw material than any one in mode, prepare dedusting ash of stainless steel compound:
(1) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15 water 7 ~ 13;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
(2) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 70 ~ 75 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 coal dust 5
~10;
Dedusting ash of stainless steel, wilkinite, cement, coal dust are mixed with water;
(3) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 iron scale or iron filings 5 ~ 18;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
All solid materials in above-mentioned three groups of raw materials are all needed to be milled down to the grade that 0-200 object ratio accounts for more than 60%;
iIpressure ball or agglomeration
Pressure ball, inserts ball press and is pressed into pelletizing block by compound, then by pelletizing block dry or maintenance to specify intensity; Requirement >=the 700N/ of intensity is individual; Pelletizing block diameter or each length of side are within 4 ~ 10cm;
iIIbatching
By the pelletizing block of drying or maintenance is good, add in shaft furnace according to the mode of a collection of cold-consolidated ball agglomerate of a collection of coke; The mass distribution ratio of raw material is:
Pelletizing block 60 ~ 70 foundry coke 10 ~ 15 stamp-charging coke 10 ~ 15
Flux 3 ~ 6.
iVsmelt
Be added in shaft furnace by the above-mentioned raw material prepared, the order of shove charge is a slag steel, two foundry cokes, three pelletizing blocks, four stamp-charging cokes, and five flux, hot blast temperature during smelting is not less than 730 DEG C, oxygen enrichment percentage 10 ~ 18%, utilization coefficient 2.0 ~ 3.2.
Above-mentioned dedusting ash is the method for the stainless molten iron of raw material production, and its steps characteristic is:
ibatch mixing
Adopt three assembly of following raw material than any one in mode, prepare dedusting ash of stainless steel compound:
(1) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15 water 7 ~ 13;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
(2) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 70 ~ 75 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 coal dust 5
~10;
Dedusting ash of stainless steel, wilkinite, cement, coal dust are mixed with water;
(3) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 iron scale or iron filings 5 ~ 18;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
All solid materials in above-mentioned three groups of raw materials are all needed to be milled down to the grade that 0-200 object ratio accounts for more than 60%;
iIpressure ball or agglomeration
Compound is put into after mixing machine adds water by agglomeration, and stir, discharging, to brick pressing machine, after vibrating forming, becomes square or prism block, requirement of strength >=5Mpa, and size at 5cm ~ 15 cm, and ensures to smelt at stove have certain intensity, intensity >=3.5Mpa;
iIIbatching
By the prism block of drying or maintenance is good, add in shaft furnace according to the mode of a collection of cold solid prism agglomerate of a collection of coke; The mass distribution ratio of raw material is:
Prism block 60 ~ 70 foundry coke 10 ~ 15 stamp-charging coke 10 ~ 15
Flux 3 ~ 6
iVsmelt
Be added in shaft furnace by the above-mentioned raw material prepared, the order of shove charge is a slag steel, two foundry cokes, triangular prism block, four stamp-charging cokes, and five flux, hot blast temperature during smelting is not less than 730 DEG C, oxygen enrichment percentage 10 ~ 18%, utilization coefficient 2.0 ~ 3.2.
The percent mass proportioning of the dedusting ash of stainless steel main component of the present invention is:
TFe：20%～35% Ni：0.8%～7.0% SiO2：4.8%～10%
MgO：2%～5% Al2O3：4%～8% Cr：4%～12%
P：≤0.030%% MnO：0.5%～1.5%。
42.5 silicate cements that cement selection is common.
beneficial effect of the present invention
1, use stamp-charging coke Some substitute foundry coke, realize the utilization of stamp-charging coke at oxygen enrichment shaft furnace.After oxygen enrichment shaft furnace uses aforesaid method, normal circumstances substitutes foundry coke with Jiao that fiddles with of 50%, and ton iron cost reduces by 86.3 yuan, achieves good economic benefit.
2, by changing loading sequence, improving furnace atmosphere, reducing coke ratio, improve the metal recovery rate 1.15% of oxygen enrichment shaft furnace.
Embodiment
Clearly demonstrate the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Three embodiments are all at volume 86.5m
3oxygen enrichment shaft furnace implement.
embodiment one
The present embodiment comprises following step successively.
ibatch mixing
Following raw material is adopted to prepare dedusting ash of stainless steel compound:
(1) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 75 wilkinite 2 cement 13 water 10.
Dedusting ash of stainless steel, wilkinite, cement are mixed with water.
Solid materials all in above-mentioned raw materials is all needed be milled down to the grade that 0-200 object ratio accounts for more than 60%.
iIpressure ball or agglomeration
The present embodiment is pressure ball, compound is inserted ball press and is pressed into pelletizing block, then by pelletizing block dry or maintenance to specify intensity.Requirement >=the 700N/ of intensity is individual; Within pelletizing block diameter 4 ~ 10cm, to shape no requirement (NR).
iIIbatching
By the pelletizing block of drying, add in oxygen enrichment shaft furnace according to a collection of.
The mass distribution ratio of raw material is:
Pelletizing block 65 foundry coke 13 stamp-charging coke 13 silica 3 fluorite 1 slag steel 5;
Above-mentioned raw materials every part 40kg.
iVsmelt
The above-mentioned raw material prepared is added in oxygen enrichment shaft furnace and smelts, the order of shove charge is a slag steel, two foundry cokes, three pelletizing blocks, four stamp-charging cokes, five flux, change charging kind and order, play two kinds of coke advantage separately, hot blast temperature during smelting is not less than 730 DEG C ~ 750 DEG C, oxygen enrichment percentage 10 ~ 17%, utilization coefficient 2.0 ~ 3.2.
vmolten iron discharging
After raw material is added by fire door, through whole shaft, temperature constantly raises, when temperature is elevated to after more than 800 DEG C, fixed carbon generation reduction reaction in ferric oxide in the agglomerate of cold consolidation, nickel oxide and coal dust, generate fe and nickel, when temperature continues to raise, reach more than 1250 DEG C, chromic oxide generation reduction reaction in the agglomerate of cold consolidation, generate simple substance chromium, finally form metal pool at cupola well, tap a blast furnace when liquid metal reaches a certain amount of.
vImolten iron ingot bar and slag particle
Molten iron overflow, on pig-casting machine, becomes the pig iron through water-cooled, for the production of making steel; Slag is granulated by high pressure water, forms grain slag.
embodiment two
The present embodiment and embodiment one are unlike in step I
in batch mixing, the proportion by weight of composition dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 70 wilkinite 2 cement 13 water 9 coal dust 6;
Other is identical with embodiment one.
embodiment three
The present embodiment and embodiment one are unlike in step I
in batch mixing, the proportion by weight of composition dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 70 wilkinite 2 cement 12 water 10 iron filings 6
;
Other is identical with embodiment one.
embodiment four
the present embodiment and embodiment one are unlike in step
iIin pressure ball or agglomeration, be agglomeration: put into by compound after mixing machine adds water, stir, discharging, to brick pressing machine, after vibrating forming, becomes square or prism block, reaches certain intensity.Intensity 5Mpa, size at 5cm ~ 15 cm, and ensures to smelt at stove have certain intensity (>=3.5Mpa).Other is identical with embodiment one.
embodiment five
the present embodiment and embodiment two are unlike in step
iIin pressure ball or agglomeration, be agglomeration: put into by compound after mixing machine adds water, stir, discharging, to brick pressing machine, after vibrating forming, becomes square or prism block, reaches certain intensity.Intensity 5Mpa, size at 5cm ~ 15 cm, and ensures to smelt at stove have certain intensity (>=3.5Mpa).Other is identical with embodiment two.
embodiment six
the present embodiment and embodiment three are unlike in step
iIin pressure ball or agglomeration, be agglomeration: put into by compound after mixing machine adds water, stir, discharging, to brick pressing machine, after vibrating forming, becomes square, reaches certain intensity.Intensity 5Mpa, size at 5cm ~ 15 cm, and ensures to smelt at stove have certain intensity (>=3.5Mpa).Other is identical with embodiment three.
Claims (3)
1. dedusting ash is a method for the stainless molten iron of raw material production, and it comprises following step successively, batch mixing, pressure ball or agglomeration, batching, smelting, molten iron discharging and molten iron ingot bar and slag particle, it is characterized in that the order of shove charge is when smelting; One slag steel, two foundry cokes, three pelletizing block or prism block, four stamp-charging cokes, five flux.
2. dedusting ash according to claim 1 is the method for the stainless molten iron of raw material production, and its steps characteristic is:
ibatch mixing
Adopt three assembly of following raw material than any one in mode, prepare dedusting ash of stainless steel compound:
(1) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15 water 7 ~ 13;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
(2) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 70 ~ 75 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 coal dust 5
~10;
Dedusting ash of stainless steel, wilkinite, cement, coal dust are mixed with water;
(3) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 iron scale or iron filings 5 ~ 18;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
All solid materials in above-mentioned three groups of raw materials are all needed to be milled down to the grade that 0-200 object ratio accounts for more than 60%;
iIpressure ball or agglomeration
Pressure ball, inserts ball press and is pressed into pelletizing block by compound, then by pelletizing block dry or maintenance to specify intensity; Requirement >=the 700N/ of intensity is individual; Pelletizing block diameter or each length of side are within 4 ~ 10cm;
iIIbatching
By the pelletizing block of drying or maintenance is good, add in shaft furnace according to the mode of a collection of cold-consolidated ball agglomerate of a collection of coke; The mass distribution ratio of raw material is:
Pelletizing block 60 ~ 70 foundry coke 10 ~ 15 stamp-charging coke 10 ~ 15
Flux 3 ~ 6;
iVsmelt
Be added in shaft furnace by the above-mentioned raw material prepared, hot blast temperature during smelting is not less than 730 DEG C, oxygen enrichment percentage 10 ~ 18%, utilization coefficient 2.0 ~ 3.2.
3. dedusting ash according to claim 1 is the method for the stainless molten iron of raw material production, and its steps characteristic is:
ibatch mixing
Adopt three assembly of following raw material than any one in mode, prepare dedusting ash of stainless steel compound:
(1) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15 water 7 ~ 13;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
(2) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 70 ~ 75 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 coal dust 5
~10;
Dedusting ash of stainless steel, wilkinite, cement, coal dust are mixed with water;
(3) proportion by weight forming dedusting ash of stainless steel compound is:
Dedusting ash of stainless steel 68 ~ 80 wilkinite 1 ~ 3 cement 12 ~ 15
Water 7 ~ 13 iron scale or iron filings 5 ~ 18;
Dedusting ash of stainless steel, wilkinite, cement are mixed with water;
All solid materials in above-mentioned three groups of raw materials are all needed to be milled down to the grade that 0-200 object ratio accounts for more than 60%;
iIpressure ball or agglomeration
Compound is put into after mixing machine adds water by agglomeration, and stir, discharging, to brick pressing machine, after vibrating forming, becomes square or prism block, requirement of strength >=5Mpa, and size at 5cm ~ 15 cm, and ensures to smelt at stove have certain intensity, intensity >=3.5Mpa;
iIIbatching
By the prism agglomerate of drying or maintenance is good, add in shaft furnace according to the mode of a collection of cold solid prism agglomerate of a collection of coke; The mass distribution ratio of raw material is:
Prism block 60 ~ 70 foundry coke 10 ~ 15 stamp-charging coke 10 ~ 15
Flux 3 ~ 6
iVsmelt
Be added in shaft furnace by the above-mentioned raw material prepared, hot blast temperature during smelting is not less than 730 DEG C, oxygen enrichment percentage 10 ~ 18%, utilization coefficient 2.0 ~ 3.2.
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| CN201410166053.0A CN104342530A (en) | 2014-04-24 | 2014-04-24 | A method for producing stainless molten iron by taking fly ash as raw material |
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| CN101654738A (en) * | 2009-09-15 | 2010-02-24 | 山西太钢不锈钢股份有限公司 | Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material |
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| CN103343221A (en) * | 2013-07-12 | 2013-10-09 | 山西太钢不锈钢股份有限公司 | Method for using fly ash as molten iron smelting material |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1435500A (en) * | 2002-01-31 | 2003-08-13 | 宝山钢铁股份有限公司 | Method for smelting chromium-contg. melted iron with powder ore cooled agglomerated pellet |
| CN101603140A (en) * | 2009-07-25 | 2009-12-16 | 山西太钢不锈钢股份有限公司 | Method with the laterite ore smelting nickel-containing molten iron |
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| CN101654738A (en) * | 2009-09-15 | 2010-02-24 | 山西太钢不锈钢股份有限公司 | Method for smelting chromated-nickel-containing molten iron by stainless steel dedusting ash and iron scale companion material |
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Application publication date: 20150211 |