CN111378833A - Sintering, mixing and homogenizing direct feeding process - Google Patents

Abstract

The sintering, mixing and homogenizing direct feeding process comprises the following process steps: 1) a plurality of ferrous raw material varieties are sequentially stacked to a primary stock ground after entering a factory; 2) conveying a plurality of iron-containing raw material varieties in a primary stock ground to corresponding pre-proportioning bins through small belt conveyors respectively by using a material taking machine; 3) the multiple disc feeders respectively convey the corresponding raw materials in the pre-distribution trough to the metering dragging belt, and directly convey and meter feed in the conveying process; 4) the proportioned materials are sent to a sintering machine by a metering dragging type belt, and the raw materials are uniformly mixed in the process of transportation. The invention cancels a secondary stock ground, and raw materials directly enter a pre-proportioning trough; after the direct production, part of short raw materials such as gas ash, recycled powder, fine iron powder, cleaning material and the like change the production management mode of the traditional periodic centralized blending into the production mode of dividing each sintering pre-blending process for reasonable matching and whole-process blending.

Description

Sintering, mixing and homogenizing direct feeding process

Technical Field

The invention belongs to the technical field of metallurgy, and relates to a sintering, mixing and direct feeding process.

Background

In the production of steel, the iron-containing raw material sintering and mixing stock ground generally adopts a secondary mixing process, and the secondary mixing process of the secondary stock ground ingredients in the prior art comprises the following steps: 1) stacking each iron-containing raw material entering a factory to a primary stock ground; 2) conveying each iron-containing raw material to a pre-proportioning trough through a small belt for standby; 3) the stacker/reclaimer lays and stacks each iron-containing raw material from the pre-proportioning tank to a set height layer by layer in a secondary stock yard; 4) and the stacker/reclaimer conveys the uniformly mixed mixture to the sintering furnace for use in a cutting mode.

The secondary stock ground process in the prior art has the following defects: (1) the material pile of the secondary stock ground is more than ten meters high, the material collapse phenomenon often occurs in rainy season due to open-air operation, and the blending stacker and the blending reclaimer belong to large-scale stock ground equipment, so that the daily maintenance and overhaul cost is high, the environment is severe, and the overhaul difficulty is high; (2) in the 'tiling interception' process, a secondary stock ground has a uniformly mixed stock pile of nearly 10 ten thousand tons, and the production cycle is seven to eight days long; (3) the production cycle is long, the chemical composition traceability of the mixture is poor, and the silicon operation difficulty in the cycle is large.

Disclosure of Invention

The invention aims to provide a sintering, mixing and refining direct feeding process, which can save a secondary stock ground and a secondary stock ground batching process step and implement a short-process direct feeding process flow of real-time and equal-time silicon.

The technical scheme of the invention is as follows:

the sintering, mixing and homogenizing direct feeding process flow comprises the following steps:

1) a plurality of ferrous raw material varieties are sequentially stacked to a primary stock ground after entering a factory;

2) conveying a plurality of iron-containing raw material varieties in a primary stock ground to corresponding pre-proportioning bins through small belt conveyors respectively by using a material taking machine;

3) the multiple disc feeders respectively convey the corresponding raw materials in the pre-distribution trough to the metering dragging belt, and directly convey and meter feed in the conveying process;

4) the proportioned materials are sent to a sintering machine by a metering dragging type belt, and the raw materials are uniformly mixed in the process of transportation.

In the step 3), the dragging type belt consists of a belt and a belt scale, and the discharge amount can be controlled by inputting the determined unit time conveying amount to the dragging type belt.

The invention combines the sintering theory and the demonstration research of relevant sintering experts, cancels a secondary stock ground, and leads the raw materials to directly enter a pre-proportioning trough. After the process is directly carried out, part of short raw materials such as gas ash, recycled powder, fine iron powder, cleaning material and the like change the production management mode of the traditional periodic centralized blending into the production mode of dividing each sintering pre-blending process for reasonable matching and whole-process blending.

The invention can cancel a secondary stock ground and has the advantages that a plurality of disk feeders are adopted to directly convey and measure and feed materials in the conveying process, and the mixture ratio of various raw materials is realized by different conveying and feeding amounts of the plurality of disk feeders. And save the secondary stock ground and brought huge benefit for the steel plant, the advantage specifically embodies:

a. the sintering and blending process is optimized, the problems of high operation and maintenance cost, high production difficulty in rainy season, low post efficiency, large land occupation area and the like of large-scale stock ground equipment such as a blending stocker, a blending reclaimer and the like are effectively solved, and a stock ground environment pollution source is thoroughly eliminated after a secondary stock ground is cancelled;

b. the production process operations such as ore blending and the like are simplified, ore blending varieties are correspondingly reduced, the labor intensity is reduced, the production mode realizes rigid connection, and the process indexes are in one-to-one correspondence and can be traced;

c. the situations of material waiting, material breaking and the like can not occur, the production quality guarantee capacity is improved, and the inventory is reduced;

d. the sintering raw materials are directly conveyed by a pre-proportioning process according to a preset proportion, the proportion can be changed at any time, and the requirements of the raw materials on the production of silicon in real time and the like are met;

the method has the beneficial effects that in the step d, the silicon is constantly kept, in order to measure the stability of the components of the raw materials conveyed to the sintering machine, the silicon content of the raw materials is taken as the basis, after the mixed materials are fed directly, the silicon content of iron-containing raw materials in a factory is different, and the pre-batching process is carried out by taking a dragging type belt as the basis and taking the set proportion to constantly meet the batching requirement of the stable silicon components.

Drawings

FIG. 1 is a flow chart of a blending process in the prior art.

FIG. 2 is a flow chart of the blending process of the present invention.

Fig. 3 is a schematic structural view of the drag belt device of the blending process of the invention.

In the figure: 1-a pre-batching groove, 2-a small belt, 3-a secondary stock ground, 4-a primary stock ground, 5-a stacker/reclaimer, 6-a sintering batching groove, 7-a pre-batching process, 8-a metering dragging belt, 9-a belt conveyor, 10-a belt scale and 11-a disc feeder.

Detailed Description

The following further description is made in conjunction with the accompanying drawings and embodiments.

Fig. 1 shows a process flow of a secondary stock ground batching in the prior art, which comprises the following steps:

1) piling iron-containing raw materials entering a factory to a primary stock dump (4);

2) conveying each iron-containing raw material to a pre-distribution trough (1) through a small belt (2) for standby;

3) the stacker/reclaimer (5) lays and stacks each iron-containing raw material from the pre-proportioning tank (1) to a set height in the secondary stock yard (3) layer by layer;

4) and the stacker/reclaimer (5) conveys the uniformly mixed mixture to the sintering machine for use in a cutting mode.

Fig. 2 and 3 show an embodiment of a sintering and homogenizing straight-feeding process flow of the present invention, which comprises the following steps:

1) a plurality of ferrous raw material varieties are sequentially stacked to a primary stock ground (4) after entering the factory;

2) a plurality of iron-containing raw material varieties in the primary stock ground (4) are respectively conveyed to corresponding pre-proportioning bins (1) through small belt conveyors (2) by a stacker/reclaimer (5);

3) the multiple disc feeders (11) respectively convey the corresponding raw materials in the pre-prepared material groove (1) to the metering dragging type belt (8), and the multiple disc feeders (11) directly convey and meter feed in the conveying process;

4) the proportioned materials are mixed into a sintering machine by the metering dragging belts (8), and the raw materials are uniformly mixed in the process of transportation.

As shown in fig. 3, in step 3), the metering dragging type belt (8) is composed of a belt conveyor (9) and a belt scale (10), and the discharge amount can be controlled by inputting the determined conveying amount per unit time. The beneficial effects are that: firstly, the equipment is relatively simple, the maintenance cost is low, and a large amount of maintenance cost and overhaul load can be reduced; secondly, each pre-batching system is transformed into 2-3 belt weighers (the original design range is 20-200 tons) with the range of 0-60 t/t, so that normal distribution of partial small-flow varieties and externally-matched short-variety raw materials is ensured.

Example 1

Table 1 is a table comparing indexes of 1# sintering machine before and after process modification.

TABLE 1 comparison table of sintering indexes before and after process modification

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Example 2

Table 2 is a table comparing indexes of 2# sintering machine before and after process modification.

TABLE 2 comparison table of sintering indexes before and after process modification

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Claims (1)

1. The sintering, mixing and homogenizing direct feeding process is characterized by comprising the following steps of:

a plurality of ferrous raw material varieties are sequentially stacked to a primary stock ground after entering a factory;

conveying a plurality of iron-containing raw material varieties in a primary stock ground to corresponding pre-proportioning bins through small belt conveyors respectively by using a material taking machine;

3) the multiple disc feeders respectively convey the corresponding raw materials in the pre-distribution trough to the metering dragging belt, and directly convey and meter feed in the conveying process;

4) the proportioned materials are sent to a sintering machine by a metering dragging type belt, and the raw materials are uniformly mixed in the process of transportation.

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