CN103334004B - Method for producing sinter from Yuanjia village concentrate powder by using large sintering machine - Google Patents

Abstract

The invention relates to a method for producing sinter from Yuanjia village concentrate powder by using a large sintering machine. The method comprises the following steps of: (I) portioning raw materials: 20-50 parts of Yuanjia village concentrate powder, 35-50 parts of Jianshan ore powder, less than or equal to 25 parts of Yangdi ore powder, 3-5 parts of steel slag, 3-5 parts of mill scale and less than or equal to 3 parts of serpentine; mixing the raw materials into a uniformly-mixed support material; and mixing the uniformly-mixed support material, blast furnace return ore, lime, dolomite and coke powder to obtain sinter; (II) adding water into the sinter and mixing; (III) pelletizing, wherein the content of the pellets larger than or equal to 3mm is greater than or equal to 70%; (IV) performing solvent and fuel wrapping operation on the added coke powder and dolomite in the materials from the pelletizer in a three-times mixing machine; (V) distributing and pressing materials, wherein the thickness of the material layer is 720-740mm after the distribution; (VI) igniting, wherein the ignition air temperature is 800-900 DEG C, and the ignition temperature is 1,040-1,050 DEG C; (VII) sintering to obtain sinter; and (VIII) screening. The method for producing sinter provided by the invention has the advantages of reasonable ore blending and enhanced uniform mixing, and realizes high sinter quality.

Description

The method of agglomerate produced by large-type sinterer adapted Yuan Jia village fine ore

Technical field

The present invention relates to the method that agglomerate produced by a kind of large-type sinterer adapted Yuan Jia village fine ore.

Background technology

The 660m that applicant has a whole world maximum ²sinter machine, general large-type sinterer (>=400m ²) providing agglomerate for large blast furnace, raw material is entirely for rich fine ore or based on rich fine ore (granularity is greater than 1mm and accounts for more than 50%), rich fine ore ratio is more than 90%.If Japan, domestic Baosteel 495m2 sinter machine, Shoudu Iron and Steel Co capital Tang 550m2 sinter machine are full rich ore powder sintering substantially, fine powder ratio is less than 10% once in a while.And applicant invests construction Liao Yuanjia village iron ore, produce 7500000 tons of ultra-fine fine iron breezes per year, except 2,500,000 tons for the production of except pelletizing, about have 5,000,000 tons for sintering, make 660m ²sinter machine must based on supper fine refined breeze.Supper fine refined breeze can worsen mixing bed permeability, affects the quality of agglomerate.

Yuan Jia village fine ore is based on rhombohedral iron ore and contains the complicated fine iron breeze of a small amount of magnetite and limonite, and in its size composition ,-0.043mm has exceeded 95%, is a kind of supper fine refined breeze.The fine ore of adapted fineness like this, is very disadvantageous for large-type sinterer mixture ventilation and sintering process, sintering process can be made slack-off, and quality is deteriorated, and sintering more seriously can be caused flame-out, can not burn.But as much as possible utilizing Self producing resources, is reduce blast-melted smelting cost, the effective means of related company survival and development.

Summary of the invention

The above-mentioned deficiency of the method for agglomerate is produced in order to overcome existing large-type sinterer adapted Yuan Jia village fine ore,

The invention provides one join ore deposit rationally, strengthening mixing, the method for agglomerate produced by the large-type sinterer adapted Yuan Jia village fine ore that sinter quality is high.

Applicant self-produced Yuan Jia village its crystal grain of fine ore is superfine, and very responsive to moisture, adequate moisture interval is narrower; Ore particle surface is more smooth, and grain class distribution is narrower, although fine size pellet performance is not fine.Therefore the breeze that a kind of mineral composition is complicated, basic property is unique is belonged to.It is carried out rational ore matching with magnet fine mineral powder, YD powder, slag, iron scale and flux and forms a kind of blending ore, set up powerful mixer with after strengthening mixing, then prepare burden with other flux and fuel, conservative control parameter, defines large-scale 660m ²sinter machine is the thin fine ore of adapted at high proportion, produces the sintering method of agglomerate.

Wherein principle:

One is be suitable for joining ore deposit to determine reasonable raw material mix, is beneficial to granulate and intensified-sintered process reaction, impels agglomerate formation to take calcium ferrite as the mineral structure of main binding phase; On the other hand, carry out supporting advantageous measures enforcement, guarantee the improvement of permeability of sintering material bed, obtain the rational method that high quality agglomerate produced by ultra-large type sinter machine.

Join ore deposit principle:

Sintering process reaction comprises:

C+O ₂=CO

Fe ₂o ₃+ CO=Fe ₃o ₄+ CO ₂+ 37136.92J/gmol needs heat absorption

And 2Fe ₃o ₄+ 1/2O ₂=3Fe ₂o ₃thermopositive reaction

The good magnet fine mineral powder of pellet performance is utilized to join ore deposit with it, one, Intensified support effect, two, with augmenting response face, guarantee the reasonable balance of sintering process heat, to reduce solid fuel consumption.The comparatively thick and assimilation good YD ore deposit of performance of adapted granularity adds joins ore deposit, intensified response, and improves the ventilation property of compound.

Adapted iron scale (a kind of iron scale for Steel Plant's recycling), one, improve Iron grade, two, utilize oxidation institute liberated heat.

Yuan Jia village fine ore mineral composition complexity (see table 1), granularity very thin (see table 2) ,-325 order content reach more than 95%, it is to moisture-sensitive, and adequate moisture interval is narrow, sintering parameter bad control when ratio is higher, sintering process is slack-off, and sintered material even can be caused to stop working.Therefore, in order to Appropriate application Yuan Jia village fine ore on large-type sinterer, need to find out Reasonable and be when suitable for joining ore deposit kind.In the condition utilizing existing processing unit, most important to the adjustment of sintering process parameter.

Table 1 Yuan Jia village fine ore thing phase composite table %

Table 2 Yuan Jia village fine ore granularity (contrasting with sharp mountain powdered iron ore) detected result %

Grade/order	+200	200~325	-325
				Yuan Jia village fine ore	1～1.3	3～3.3	94～96.5
Point mountain powdered iron ore	1～2	13.5～14.5	83～85

The composition of the breeze that the present invention adopts is in table 3

Table 3 breeze Chemical Composition table

Title	ＴFe	FeO	SiO 2	Al 2O 3	CaO	MgO	P	S	Ig
										Brown ocher	57.73	0.59	5.59	1.77	0.073	0.080	0.037	0.010	10.38
Magnet fine mineral powder	68.9	27.42	3.92	0.19	0.27	0.35	0.01	0.026	0.45
										Yuan Jia village fine powder	65.4	3.3	3.78	0.21	0.26	0.27	0.015	0.012	0.32
Slag	45.42	26.01	6.55	0.87	8.55	1.76	0.04	0.24	12.23
										Iron scale	72.67	62.94	0.18	0.09	0.2	0.048

The method that agglomerate produced by this large-type sinterer adapted Yuan Jia village fine ore comprises following step successively:

ithe proportioning of raw material

The proportion by weight that a mixes admixtion is

Yuan Jia village fine ore 20 ~ 50 parts; Point mountain breeze 35 ~ 50 parts;

Raise enlightening breeze≤25 part;

3 ~ 5 parts, slag; Iron scale 3 ~ 5 parts; Serpentine≤3 part;

By above-mentioned admixtion, be placed on blending yard, then fetch water and carry out pre-wet, guarantee that pre-wet (quality of water reaches 6.5-7.4% of total amount) biodiversity part reaches 7-8 parts;

Mix with intensive mixer again, become mixing admixtion;

The proportion by weight of b sintered material

If when mixing admixtion is 100 parts

BF return fines 11 ~ 15 parts; Lime 4 ~ 8part; Rhombspar 4 ~ 6 parts;

Coke powder 4 ~ 5.5part;

Wherein, BF return fines adds water pipe in material distribution disk blanking place, carries out pre-wet, and after pre-wet, moisture content is 6 ~ 7%.

iIsintered material mixes

Above-mentioned sintered material is transported in a mixing machine and carries out mixture operation, and mixture moisture is 6 ~ 7%;

iIIgranulate

Out enter nodulizer from mixer, carry out granulation operation, content >=70% of granulation ball requirement >=3mm; Set up atomizer in nodulizer, the moisture content in granulation ball is 6 ~ 7.5%;

iVwrap up in fuel and flux outward

Add outer coke powder of joining and rhombspar from nodulizer material out at travelling belt, the amount of allocating into of coke powder accounts for total material 2 ~ 3%, the amount of allocating into of rhombspar accounts for total material 2.5 ~ 4.5%, then enter in No. three mixing machines and carry out wrapping up in operation outside flux, fuel, coke coated and rhombspar; Particle diameter is not less than content>=68% of 3mm;

The granularity of joining coke powder is outward not more than 1mm, and the granularity of joining rhombspar is outward not more than 3mm;

vcloth and binder

To wrap up in outward the mixture cloth of fuel on sinter machine, after cloth, bed depth is 720-740mm, and the binder degree of depth is 15-250mm;

vIigniting

Hot gas sintering parameter: igniting wind-warm syndrome controls at 800-900 DEG C, and ignition temperature controls at 1040-1050 DEG C; Holding temperature is 590---610 DEG C;

vIIsintering

Sintering machine speed 2 ~ 2.8m/min; Sintering negative pressure: 11 ~ 16Kpa, sinters agglomerate into;

vIIIscreening

Agglomerate, after whole grain screening process, will be not less than 5mm agglomerate and deliver to blast furnace, the agglomerate being less than 5mm will be returned internal recycle as returning mine.

The method of agglomerate produced by above-mentioned large-type sinterer adapted Yuan Jia village fine ore, it is characterized in that:

ithe proportioning of raw material

The proportion by weight that a mixes admixtion is

Yuan Jia village fine ore 35 parts; High mouth breeze 35 parts; Raise enlightening breeze 22 parts;

3 parts, slag; Iron scale 3 parts; 2 parts, serpentine;

The proportion by weight of b sintered material is

Mixing admixtion 100 parts; BF return fines 14.8 parts;

Lime 8 parts; Rhombspar 5.8 parts; Coke powder 5.5 parts.

Beneficial effect of the present invention

At applicant 660m ²yuan Jia village fine ore and magnet fine mineral powder, iron scale, steel grit, YD, serpentine is adopted to join ore deposit under sinter machine 730mm bed depth condition, by implementing effective supplementary measures, at agglomerate SiO ₂content is 4.7 ~ 5.5%, sintering basicity (CaO/SiO ₂) when being 1.8 ~ 2.1, will sintered ore rotary drum strength>=79.5% be obtained, reduction degree>=80%, the good index of cryogenic reducting powder index (+3.15mm)>=68%.

660m2 sinter machine adapted ultra-fine Yuan Jia village fine ore sintering technology, Iron Ore Matching in Sintering cost is low, the self-produced low-cost resource of Appropriate application, and guarantees that sinter quality does not glide, and can meet blast furnace high target operating requirement completely.

embodiment

Below in conjunction with embodiment, clear, complete description is carried out to technical scheme of the present invention.Described embodiment is several embodiments of the present invention, instead of limitation of the present invention.The technical scheme of agglomerate produced by the large-type sinterer adapted Yuan Jia village fine ore that those of ordinary skill in the art obtain under not having creative work prerequisite, all belongs to protection scope of the present invention.

embodiment 1

This 660m2 sinter machine adapted Yuan Jia village fine ore sintering method comprises following step successively:

ithe proportioning of raw material

The proportion by weight that a mixes admixtion is

Yuan Jia village fine ore 40 parts; Point mountain breeze 40 parts; Raise enlightening breeze 10 parts; 5 parts, slag; Iron scale 3 parts; 2 parts, serpentine;

Wherein sharp mountain breeze is magnetite; Raising enlightening breeze is limonite;

Prepare burden into admixtion in advance for totally 100 parts; Be placed on blending yard, then fetch water and carry out pre-wet, guarantee that pre-wet moisture (quality of water reaches 6.5-7.4% of total amount) mass parts reaches 7-8 parts;

Permitted the vertical strengthened mixing machine of DW40 by love power again to mix through 4 minutes, become mixing admixtion;

The proportion by weight of b sintered material is

Mixing admixtion 100 parts; BF return fines 15 parts;

Lime 7.5 parts; Rhombspar 5.5 parts; Coke powder 5.5 parts;

Totally 133.5 parts;

Wherein, BF return fines adds water pipe in material distribution disk blanking place, carries out pre-wet.After pre-wet, moisture content is 6 ~ 7%.

iIsintered material mixes

Above-mentioned sintered material is transported in a mixing machine and carries out mixture operation, and mixture moisture is 6 ~ 7%.The present embodiment amount of water per hour 20 tons.Wetting compound of spraying water is started, to extend mixing time apart from discharging point 4 meters of.

iIIgranulate

Out enter nodulizer from mixer, carry out granulation operation, granulation ball requires: content >=70% of >=3mm.Set up atomizer in nodulizer, the heating water yield per hour is 5 tons.Moisture content in grain ball is 7.5%.

Nodulizer state modulator: 1.5 °, inclination angle, rotating speed: 7r/min.

iVwrap up in fuel and flux outward

Outer coke powder of joining and rhombspar is added at travelling belt from nodulizer material (grain ball) out; the amount of allocating into (weight) of coke powder accounts for 2.5% of total material; the amount of allocating into (weight) of rhombspar accounts for 4.0% of total material; then enter in No. three mixing machines and carry out wrapping up in operation outside flux, fuel, coke coated and rhombspar.Particle diameter is not less than content >=68% of 3mm.

The granularity of joining coke powder is outward not more than 1mm, and the granularity of joining rhombspar is outward not more than 3mm.

vcloth and binder

By wrap up in fuel outward mixture (grain ball) by round roller+the nine roller feeder cloth on sinter machine, after cloth, bed depth is 730mm, the binder degree of depth is (cloth is 730mm to the material distance sinter machine bottom level on sinter machine, and after binder is taked on surface, bed thickness is to 710mm) 20mm.

vIigniting

Hot gas sintering parameter: igniting wind-warm syndrome controls at 800-900 DEG C, and ignition temperature controls at 1050 DEG C.Holding temperature is 600 DEG C.

vIIsintering

Sintering machine speed 2 ~ 2.8m/min.Sintering negative pressure: 11 ~ 16Kpa, sinters agglomerate into.

vIIIscreening

Agglomerate, after whole grain screening process, will be not less than 5mm agglomerate and deliver to blast furnace, the agglomerate being less than 5mm will be returned internal recycle as returning mine.

embodiment 2

This 660m2 sinter machine adapted Yuan Jia village fine ore sintering method comprises following step successively:

ithe proportioning of raw material

The proportion by weight that a mixes admixtion is

Yuan Jia village fine ore 35 parts; High mouth breeze 35 parts; Raise enlightening breeze 22 parts;

3 parts, slag; Iron scale 3 parts; 2 parts, serpentine;

Prepare burden into admixtion in advance for totally 100 parts; Be placed on blending yard, then fetch water and carry out pre-wet, guarantee that pre-wet biodiversity part reaches 7-8 parts;

Permitted the vertical strengthened mixing machine of DW40 by love power again to mix through 4 minutes, become mixing admixtion;

The proportion by weight of b sintered material is

Mixing admixtion 100 parts; BF return fines 14.8 parts;

Lime 8. part; Rhombspar 5.8part; Coke powder 5.5part;

Wherein, BF return fines adds water pipe in material distribution disk blanking place, carries out pre-wet.After pre-wet, moisture content is 6 ~ 7%.

Step iIsintered material mixing, step iIIgranulation, step iVwrap up in fuel and flux, step outward

vcloth and binder, step vIigniting, step vIIsintering and step vIIIscreening, identical with embodiment one.

Agglomerate, after whole grain screening process, will be not less than 5mm agglomerate and deliver to blast furnace, the agglomerate being less than 5mm will be returned internal recycle as returning mine.

Claims (1)

1. a method for agglomerate produced by large-type sinterer adapted Yuan Jia village fine ore, and it comprises following step successively:

ithe proportioning of raw material

The proportion by weight that a mixes admixtion is

Yuan Jia village fine ore 20 ~ 50 parts; Point mountain breeze 35 ~ 50 parts;

Raise enlightening breeze≤25 part;

3 ~ 5 parts, slag; Iron scale 3 ~ 5 parts; Serpentine≤3 part;

By above-mentioned admixtion, be placed on blending yard, then fetch water and carry out pre-wet, guarantee that pre-wet biodiversity part reaches 7-8 parts;

Mix with intensive mixer again, become mixing admixtion;

The proportion by weight of b sintered material

If when mixing admixtion is 100 parts

BF return fines 11 ~ 15 parts; Lime 4 ~ 8part; Rhombspar 4 ~ 6 parts;

Coke powder 4 ~ 5.5part;

Wherein, BF return fines adds water pipe in material distribution disk blanking place, carries out pre-wet;

iIsintered material mixes

Above-mentioned sintered material is transported in a mixing machine and carries out mixture operation, and mixture moisture is 6 ~ 7%;

iIIgranulate

Out enter nodulizer from mixer, carry out granulation operation, content >=70% of granulation ball requirement >=3mm; Set up atomizer in nodulizer, the moisture content in granulation ball is 6 ~ 7.5%;

iVwrap up in fuel and flux outward

Add outer coke powder of joining and rhombspar from nodulizer material out at travelling belt, the amount of allocating into of coke powder accounts for total material 2 ~ 3%, the amount of allocating into of rhombspar accounts for total material 2.5 ~ 4.5%, then enter in No. three mixing machines and carry out wrapping up in operation outside flux, fuel, coke coated and rhombspar; Particle diameter is not less than content>=68% of 3mm;

The granularity of joining coke powder is outward not more than 1mm, and the granularity of joining rhombspar is outward not more than 3mm;

vcloth and binder

To wrap up in outward the mixture cloth of fuel on sinter machine, after cloth, bed depth is 720-740mm, and the binder degree of depth is 15-250mm;

vIigniting

Hot gas sintering parameter: igniting wind-warm syndrome controls at 800-900 DEG C, and ignition temperature controls at 1040-1050 DEG C; Holding temperature is 590---610 DEG C;

vIIsintering

Sintering machine speed 2 ~ 2.8m/min; Sintering negative pressure: 11 ~ 16Kpa, sinters agglomerate into;

vIIIscreening

Agglomerate, after whole grain screening process, will be not less than 5mm agglomerate and deliver to blast furnace, the agglomerate being less than 5mm will be returned internal recycle as returning mine.