CN109504852B

CN109504852B - Method for reducing rolling segregation of end tailings

Info

Publication number: CN109504852B
Application number: CN201811550751.5A
Authority: CN
Inventors: 赵彬; 季文东; 渠世平; 卢宇栋; 李志强; 张源东
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd
Priority date: 2018-12-18
Filing date: 2018-12-18
Publication date: 2020-06-02
Anticipated expiration: 2038-12-18
Also published as: CN109504852A

Abstract

The invention provides a method for reducing rolling segregation of end tailings, which comprises the following steps: 1) the material strips are shortened by 1m, after the delay is adjusted, the height of a tail material pile is normal, and the formed material strips are a first reserved material pile; 2) through the accumulation of a plurality of material strips, the uniformly mixed ore is pushed and extruded towards the outer side of the first retained material pile, so that the retained end tailing moves outwards to form a new permanent material wall. The invention reduces the mechanical cleaning amount of the end tailings by establishing the permanent material wall, changes the segregation angle of the end tailings of the stock pile, reduces the granularity segregation in the stock pile process, further shortens the pile building time and improves the quality of the end tailings.

Description

Method for reducing rolling segregation of end tailings

Technical Field

The invention belongs to the technical field of sintering in the ferrous metallurgy industry, and particularly relates to a method for reducing rolling segregation of end tailings by forming a permanent material wall.

Background

In the process of stacking and taking bars in a domestic comprehensive sintering and mixing material yard, considering the great influence of the segregation of end tailings at the end of an end on the granularity and the components, the amount of the end tailings is reduced by adopting a herringbone stacking mode of changing a starting point and a fixed end point, but the amount of the end tailings cannot be reduced; the method of uniformly mixing and stacking the end tailings at the end head to the batching ore tank to participate in the next material pile is adopted, so that the influence of the fluctuation of the components of the end material is reduced as much as possible, but the investment cost is higher.

Disclosure of Invention

To address one or more of the problems with the prior art, the present invention provides a method of reducing rolling segregation of an end tailing, the method comprising the steps of:

1) the material strips are shortened by 1m, after the delay is adjusted, the height of a tail material pile is normal, and the formed material strips are a first reserved material pile;

2) through the accumulation of a plurality of material strips, the uniformly mixed ore is pushed and extruded towards the outer side of the first retained material pile, so that the retained end tailing moves outwards to form a new permanent material wall.

the invention discloses a method for stacking materials, which comprises the steps of stacking materials by changing a starting point and a finishing point in a stacking process, wherein different delays are arranged at the starting point and the finishing point according to different stacking layer numbers, if the first time of material retention is about 1200t, the tail material delays in the stacking process, and when the stacking materials are 240 layers, the tail part of a material stack is higher than other parts of material strips, and touches a material hammer, and a large arm automatically lifts to influence automatic stacking.

Based on the technical scheme, the invention gradually expands the end tail material wall of the end tail to the permanent material wall with the inclination angle of the maximum material taking rake angle through repeated material stacking and material taking pushing, and can reduce the rolling segregation of the end tail material due to the blocking of the permanent material wall, thereby realizing the reduction of the end tail segregation material amount in the traditional sense and reducing the material taking time and the material taking cost of the end tail material.

In the method provided by the invention, the theoretical calculation basis of the 'permanent material wall' formed by taking materials and pushing stockpiles for multiple times is as follows:

the original end tailing is similar to a vertebral body, and the calculation formula is as follows:

total end tailing amount pi R²H σ 1/3-3.3.14 × 15.5 × 15.5 × 15.5 × 2 × 1/3-7795 tons.

The tail retained pile is similar to a cuboid:

the first stockpile amount is: a, b, h, σ, 26 × 3 × 3.2 × 2, 499.2 tons

In the formula, a: width of material strip, b: length of material strip, h: height of remaining bar, σ: bulk specific gravity

The material pile is pushed outwards according to the distance of 1 m:

the stacking quantity of the bar stock of the second-time reserved material is as follows: 26.5X 4X 3.6X 2-763.2 ton

And the analogy is that:

the fifth stockpile amount of the reserved material strips is as follows: 28X 4.5X 7.2X 2-1814.4 ton

the invention reduces the mechanical cleaning amount of the end tailings by establishing the permanent material wall, changes the segregation angle of the end tailings of the stock pile (the segregation angle of the end stock pile is increased from α to β), reduces the granularity segregation in the stock piling process, further shortens the pile building time and improves the quality of the end tailings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a flow diagram of a stacker reclaimer process;

FIG. 2 is a schematic view of a variable start point and fixed end point chevron type pack;

FIG. 3 is a schematic diagram of the formation of the "permanent wall" of the present invention;

wherein the labels in the figures are represented as:

1-reclaimer roller, 2-reclaimer rake, 3-end material, 4-end tailing, 5-retained material pile in the prior art, β -first retained material pile, 7-material pile formed by multiple pushing, 8-loader operation material pile, 9-secondary extrusion retained material pile, 10-finally formed 'permanent material wall', α -stacking angle of material pile in the prior art, beta-stacking angle of material pile behind 'permanent material wall', and gamma-reclaimer rake angle.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

As shown in fig. 1, a flow chart of a stacking and reclaiming process is shown, and a stacking and reclaiming operation mode is adopted.

FIG. 2 is a schematic diagram showing a "herringbone" stacking mode with variable start points and fixed end points, which is adopted by the invention.

fig. 3 shows the forming process of the "permanent wall" of the present invention, wherein a in fig. 3 shows the effect of the retained material pile obtained by using the two-pile two-taking stacker-reclaimer method in the prior art, wherein 1 represents the reclaimer roller, 2 represents the reclaimer rake, 3 represents the head material, 4 represents the end tail material, 5 represents the retained material pile in the prior art, and 8 represents the loader operating material pile, B in fig. 3 shows the effect of the variable start-end-point "herringbone" stacker method using the method provided by the present invention, wherein 6 represents the first retained material pile, 9 represents the secondary extrusion retained material pile, wherein the first retained material pile 6 is obtained by extremely reducing the strip by 1m, adjusting the delay time (from the beginning 50s to 45s), the obtained first retained material pile is obtained by a plurality of extrusions, C in fig. 3 shows the effect of the pile formed by a plurality of extrusions, wherein 7 represents the pile formed by a plurality of extrusions, 10 represents the finally formed "permanent wall", 3 provides the permanent wall which can be treated by the mechanical method of reducing the segregation angle of the end tail material pile after the mechanical process, and the segregation angle of the existing mechanical method can be increased, and the segregation angle of the tail material pile can be increased by the present invention, and the angle of the method provided by the invention, the method of the invention can be increased after the reduction of the increase of the angle of the tail material pile after the tail material pile.

The method is applied to uniformly mixing the material strips, and the effect is shown as follows: after the method is adopted, the average qualification rate of the SiO2 +/-0.2 of the uniformly mixed ore is 79.36 percent, which is improved by 2.6 percent compared with the former 76.76 percent, the index improvement effect is obvious, and the material taking time of a loader is reduced by 2.5 hours.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for reducing rolling segregation of end tailings, which is characterized by comprising the following steps:

2. The method of claim 1, wherein the adjusting the delay is adjusting a starting 50s to 45 s.

3. The method according to claim 1 or 2, wherein the "permanent material wall" means that the amount of the end material left in the tail stacking process is not increased and is not moved outwards.

4. The method of claim 3, wherein the stacking is performed in a variable start-to-end manner.

5. A method according to claim 1 or claim 2, wherein the end-to-end heap angle of the finally formed retentate heap is increased.