CN1851011A

CN1851011A - Production method for improving sintered ore rotary drum strength

Info

Publication number: CN1851011A
Application number: CN 200610040568
Authority: CN
Inventors: 尹明东; 顾云松
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-25
Filing date: 2006-05-25
Publication date: 2006-10-25
Anticipated expiration: 2026-05-25
Also published as: CN100374588C

Abstract

The invention discloses the method of improving the intension of the high sinter mine turning drum, it belongs to the producing process of the mostly charging-sinter mine of the blast furnace puddling characterized in that adding the technics of exalting the turning drum after the sinter mine cooling technics, the crust design of the turning drum hoisting machine are the form of the cylinder, the disk, the taper, the sinter mine is performed the attrition handling in the lumen of the turning drum hoisting machine, the filling rate of the sinter mine in the turning drum hoisting machine is 3%-20%, the sinter circumrotates and grits 0.5-8 minutes in the turning drum hoisting machine; using the reciprocate of advance-slide-beat-friction, the pointedness edge part of the sinter mine is grits to round, the material with surface brittleness separates, the crack disjoints, the exterior of the sinter mine is round, the granularity is even, the intension of the turning drug of the sinter mine improves highly, the blowing quantity of the returning powder and the blast furnace of the puddling factory lessens greatly, the ventilate ability of the material pole of the blast furnace improves, the producing cost is low and the producing efficiency of the puddling of the blast furnace.

Description

Improve the production method of sintered ore rotary drum strength

Technical field

The invention belongs to the production technique of the main furnace charge of blast furnace ironmaking, especially relate to a kind of production technique of agglomerate.

Background technology

The main furnace charge of blast furnace ironmaking is an agglomerate, pellet, rawore and coke, wherein the tumbler index of agglomerate is an important indicator estimating agglomerate shock resistance and wear resisting property, especially to greatly, it is even more important that medium blast furnace seems, it is one of basic guaranteed conditions of blast furnace " high yield; high-quality; low consumption ", if sintered ore rotary drum strength is poor, after entering blast furnace, powder will increase, the ventilation property variation of blast furnace, the final direct motion that influences blast furnace, at present the measuring method of China's agglomerate tumbler index is: 20kg rotary drum sample is packed in the drum unit, rotating speed rotation 8min with 25r/min, agglomerate is poured into carried out reciprocally swinging screening 10 times on the 5mm square hole sieve of suspending, be the tumbler index of agglomerate on the sieve greater than the per-cent of the weight of 5mm part and 20kg rotary drum sample, the tumbler index of agglomerate is to control by the reasonably combined and sintering process of raw materials for sintering, because the raw materials for sintering otherness of each factory, therefore the index of each Steel Plant differs greatly, it is main because the characteristics of agglomerate are vesicular (porosity are generally 20～50%), corner angle are sharp-pointed, bonding phasor and intensity heterogeneity, the surface in monolithic sintered ore deposit is that cooling air is concentrated the place of passing, also being crumbly mass---glassy phase is the place of easy generation, so determined the tumbler index of agglomerate that certain Limiting Level is arranged, the tumbler index of the agglomerate that traditional sintering process is produced, advanced level also can only maintain about 80%, and greatly, still there is a certain distance in the actual requirement of medium blast furnace; Agglomerate all is that sinter cake by bulk is through fragmentation before entering blast furnace, beat, fall and form, the intensity of agglomerate is not uniformity from the inside to surface, before entering blast furnace, agglomerate splits into the fritter agglomerate from the monoblock large flat bread, the surface is the weakest place of intensity, also there are some relatively weaker places simultaneously in inside, present transportation, sieving technology is not enough to the crumbly mass on surface is cleaned out, the agglomerate of barrate strength difference enters blast furnace, to make the agglomerate powder increase, influence blast furnace permeability, increase the back powder amount of iron work, reduce production efficiency, finally influenced the production economic benefit of blast furnace.

Summary of the invention

The objective of the invention is to propose a kind of production method that improves sintered ore rotary drum strength, the corner angle that solve agglomerate effectively are sharp-pointed, the factors such as otherness of crackle and bonding phase cause the low problem of tumbler index, significantly improve the barrate strength of agglomerate, simultaneously also make the grade of agglomerate be tending towards homogenizing, can satisfy the needs of large and medium-sized blast furnace " high yield, high-quality, low consumption ", reduce the back powder amount of iron work, reduce trucking costs, enhance productivity.

The object of the present invention is achieved like this: a kind of production method that improves sintered ore rotary drum strength, its technological process of production is by (the iron charge of getting the raw materials ready, flux, fuel) → batching → mixing → granulation → cloth → igniting → sintering → fragmentation → cooling → whole grain → finished product composition, it is characterized in that behind the agglomerate process for cooling, setting up rotary drum and promote technology, it is to be transported in the rotary drum lift after the agglomerate cooling that rotary drum promotes technology, the agglomerate processing that in rotary drum lift inner chamber, rubs, the filling ratio of agglomerate in the rotary drum lift is 3%～20%, make agglomerate at rotary drum lift internal rotation friction 0.5～8min, to-and-fro movement by lifting → landing → beat → rub, make the sharp-pointed position of the corner angle rounding of agglomerate, the surface brittleness separating substances, crackle disintegrates, agglomerate external form slyness, epigranular, reach the purpose of the tumbler index that promotes agglomerate, the shell of rotary drum lift is designed to cylinder, disk, cone shape, be provided with in the rotary drum lift agglomerate is promoted, landing, the material delivering plate of beating, in the rotary drum lift high-abrasive material is set, in addition, also can or set up rotary drum after the finished product technology after whole grain technology and promote technology.

The present invention proposes a kind of production method that improves sintered ore rotary drum strength, has significantly improved the barrate strength of agglomerate, improves agglomerate size composition, has increased the ventilation property of blast furnace stock column.

Now in conjunction with the accompanying drawings and embodiments the production method of the raising sintered ore rotary drum strength that the present invention carried is further described.

Description of drawings

Fig. 1 is the process flow diagram synoptic diagram of the production method of raising sintered ore rotary drum strength proposed by the invention.

Among Fig. 1: 1 get the raw materials ready (iron charge, flux, fuel) 2, batching 3, mix 4, granulate 5, cloth 6, igniting 7, sintering 8, broken 9, cooling 10, rotary drum promote 11, whole grain 12, finished product

Embodiment

As can be seen from Figure 1: a kind of technical process of the production method that improves sintered ore rotary drum strength is by the 1 (iron charge of getting the raw materials ready, flux, fuel), batching 2, mix 3, granulate 4, cloth 5, igniting 6, sintering 7, broken 8, cooling 9, whole grain 11, finished product 12 is formed, it is characterized in that after agglomerate cools off 9 technologies, setting up rotary drum and promote 10 technologies, it is after agglomerate cools off that rotary drum promotes 10 technologies, be directly transferred in the rotary drum lift, the agglomerate processing that in rotary drum lift inner chamber, rubs, after the wherethrough reason, enter again in whole grain 11 technologies, the filling ratio of agglomerate in the rotary drum lift is 3%～20%, make agglomerate at rotary drum lift internal rotation friction 0.5～8min, to-and-fro movement by lifting → landing → beat → rub, make the sharp-pointed position of the corner angle rounding of agglomerate, the surface brittleness separating substances, crackle disintegrates, agglomerate external form slyness, epigranular, reach the purpose of the barrate strength that promotes agglomerate, the shell of rotary drum lift is designed to cylinder, disk, cone shape, be provided with in the rotary drum lift agglomerate is promoted, landing, the material delivering plate of beating, in the rotary drum lift high-abrasive material is set, also can or sets up rotary drum after finished product 12 technologies after whole grain 11 technologies in addition and promote 10 technologies.

Embodiment

One, agglomerate of the present invention has carried out 40 times industrial experiment on the Automatic drum machines, and effect sees Table 1

Table 1: the rotary drum industry experiment data of agglomerate

Group number	1	2	3	4	5	6	7	8
Group number	1	2	3	4	5	6	7	8	Rotation friction time min	8	8	2	1	0.4	8	2	0.8
Filling ratio %	3	6	6	6	6	9	12	12	Rotation friction time min	8	8	2	1	0.4	8	2	0.8
Filling ratio %	3	6	6	6	6	9	12	12	Handle back tumbler index %	90.67	90.45	87.57	86.78	88.04	87.63	86.93	84.60
Tumbler index % before handling	81.59	81.37	81.0	81.0	81.0	81.0	82.82	80.60	Handle back tumbler index %	90.67	90.45	87.57	86.78	88.04	87.63	86.93	84.60
Tumbler index % before handling	81.59	81.37	81.0	81.0	81.0	81.0	82.82	80.60	Comparative figure %	+9.08	+9.08	+6.57	+5.78	+7.04	+6.63	+4.11	+4.00

Table 2, after the rotary drum lift is handled, the agglomerate change of granularity

	Normally go into the stove agglomerate	Agglomerate behind the processing 8min	Agglomerate behind the processing 2min
	Normally go into the stove agglomerate	Agglomerate behind the processing 8min	Agglomerate behind the processing 2min	≤5mm％	0.0	0.0	0.0
5-10mm％	25.7	31.6	27.1	≤5mm％	0.0	0.0	0.0
5-10mm％	25.7	31.6	27.1	10-25mm％	47.6	56.8	56.5
25-40mm％	21.2	11.6	15.8	10-25mm％	47.6	56.8	56.5
25-40mm％	21.2	11.6	15.8	≥40mm％	5.5	0.0	0.6
Mean particle size mm	19.4	16.1	17.1	≥40mm％	5.5	0.0	0.6

Annotate: normally go into stove agglomerate≤5mm and partly suppose to be sieved entirely to the greatest extent.

Treatment time can be taken all factors into consideration the demand of rotary drum and granularity and decide, if actual treatment selection of time 2min.Tumbler index average out to 81.19% before agglomerate is handled, tumbler index average out to 87.25% after the rotary drum lift is handled has increased by 6.06 percentage points; The agglomerate optimum size is 10-25mm, has increased by 8.9 percentage points after the rotary drum lift is handled, and this shows that the agglomerate tumbler index obviously improves, and reaches size composition and obviously is tending towards rationally, and this has played active effect for blast furnace volume increase, consumption reduction.

Claims

1, a kind of technical process that improves the production method of sintered ore rotary drum strength is made up of get the raw materials ready (1) (iron charge, flux, fuel), batching (2), mixing (3), granulate (4), cloth (5), igniting (6), sintering (7), broken (8), cooling (9), whole (11), finished product (12), it is characterized in that:

A, after agglomerate cooling (9) technology, set up rotary drum and promote (10) technology;

It is that the agglomerate cooling is after be transported in the rotary drum lift that b, rotary drum promote (10) technology, the agglomerate processing that rubs in the chamber within it, to-and-fro movement by lifting → landing → beat → rub, make the sharp-pointed position of the corner angle rounding of agglomerate, the surface brittleness separating substances, crackle disintegrates, agglomerate external form slyness, epigranular, the barrate strength of lifting agglomerate;

C, the filling ratio of agglomerate in the rotary drum lift are 3%～20%;

D, agglomerate are at rotary drum lift internal rotation friction 0.5～8min;

The shell of e, rotary drum lift is designed to cylinder, disk, cone shape;

Be provided with the material delivering plate that makes agglomerate lifting, landing, beats in f, the rotary drum lift;

In g, the rotary drum lift high-abrasive material is set.

2, the production method of raising sintered ore rotary drum strength according to claim 1 is characterized in that setting up rotary drum after whole grain (11) technology promotes (10) technology.

3, the production method of raising sintered ore rotary drum strength according to claim 1 is characterized in that setting up rotary drum and promotes (10) technology after finished product (12) technology.