Application of single beam double net self-cleaning vibrating screen

Abstract : Single-beam double-network self-cleaning vibrating screen is applied in Jinan Iron and Steel Co., Ltd., so that the less than 5mm fine ore in the sinter ore is reduced from 14.4% to 5.1%, and the particles larger than 5mm in the returning mine are reduced from 18.1% to 7. 1%, the annual economic benefit was 8.448 million yuan.

Key words : cantilever screen; screening; sinter

CLC number : TF351.1 ⁺ 1 Document code : B Article number : 1004-4620 (2000) 02-0069-02

Application of Self-Cleaning Vibration Screen with Single Beam
And Double Screen

LIU Zong zhu,LIU Qing he,GAO Xin yun

(No.1 Ironmaking Plant of Jinan Iron and Steel Group, Jinan 250101, China)

Abstract :Since using of self cleaning vibration screen with single beam and double screen in No.1 ironmaking plant of Jinan iron and steel group the powdered sintered ore which is small than 5mm in sintered ore feeded blast furnace is decreased from 14.4% to 5.1% And the sintered ore which is bigger than 5mm in the returned sintered ore is decreased from 18.1% to 7.1% , a nd the profit of 8.448 millions yuan/a can be got.

Keywords :cantilever screen;screening;sintered ore

1 Introduction

With the continuous development and advancement of ironmaking technology, the raw materials used in the blast furnace are basically clinker that has been calcined. There are two kinds of commonly used clinker, namely sinter and pellets. The proportion of sinter is large, generally 70% to 80%, and some manufacturers use 100%. Jinan Iron and Steel Group Corporation * Ironmaking Plant (referred to as Jigang * Ironmaking Plant) in recent years, the amount of sinter has been around 78%.

The use of sinter in the blast furnace is an important symbol of the modernization of blast furnace ironmaking. Due to the high content of the sinter itself, it must be sieved before entering the blast furnace. In the sieving process, since the proportion of small particle size is large and concentrated (see Table 1), it is difficult to completely remove the powder of less than 5 mm. Therefore, the problem of sinter screening has been the subject of research in the ironmaking industry.

Table 1 Sintering particle size composition

2 sifting problems

In order to solve the problem of sinter screening, the Jinan Iron and Steel Co., Ltd. first concentrated the sieve by large-scale vibrating screen, but the powder was not well removed. Then, the vibrating screen was placed under the tank to perform dispersion screening, and the screening effect was not greatly improved. At this time, it was recognized that the screen was the key to improving the screening effect.

I have used woven screens, steel plate drilling screens, cast steel plate long hole screens and steel plate stamping comb screens, but the problem of "critical" particles blocking the mesh has not been fundamentally solved. When cleaning the screen, it was found that most of the mesh was blocked and quite strong, and it was necessary to use a chisel with one hole and one hole for chiseling. Only a few minutes after the vibrating screen was put back into operation, the mesh was re-blocked, seriously affecting the screening efficiency.

3 single beam double net self-cleaning vibrating screen and its application

"Cantilever Screen Vibrating Screen" used to be called "elastic resonance screen", which uses a single-layer cantilever screen, which can solve the problem of mesh plugging. Its screening efficiency can reach 89.39%, which is 3.5 times that of the original vibrating screen (25.4%). The main principle is that the screen mesh can generate secondary vibration, which causes the size of the mesh to change, preventing the critical particles from blocking the mesh holes, so that the vibrating screen always maintains a high screening efficiency.

Although the screening efficiency of the early cantilever screen vibrating screen has been quite high, when the sinter contains a large amount of powder and the particle size is small and concentrated, the powder of less than 5 mm is difficult to be sieved. Due to the limited bearing capacity of the single-layer screen, the excessive load may easily cause the deformation of the sieve hole, and the particles larger than 5 mm in the returned ore powder are greatly increased (see Table 2).

Table 2 Actual production data of single-layer sieve vibrating screen

Therefore, it is necessary to develop a vibrating screen having a higher screening efficiency and capable of reducing particles larger than 5 mm in the ore powder. The cantilever screens are organically combined by a preferred analysis to form a "single beam double net self-cleaning" structure. The main structure (see picture) is that the two-layer screen is fixed on the same beam, and a steel pipe is arranged between the upper and lower screens. When the vibrating screen motor stops working, the other vibrating steel tubes jump up and down, and the screen is meshed. An impact is formed to remove the critical particles remaining in the screen. The use of the above screen not only maintains a high screening efficiency, but also reduces the ratio of particles larger than 5 mm in the undersize, and also increases the life of the screen from 60 days to 180 days. 

Single beam double net self-cleaning vibrating screen structure

After the single-beam double-grid self-cleaning vibrating screen was put into use, the powder of less than 5 mm in the sintered ore and the particles larger than 5 mm in the returning ore were greatly reduced. The results are shown in Table 3.

Table 3 % of production results after self-cleaning vibrating screen with single beam and double net

It can be seen from the comparison between Table 2 and Table 3 that after single-beam double-mesh self-cleaning vibrating screen, the powder of less than 5 mm in the sintered ore is reduced by 93%, and the particles of more than 5mm in the returned ore powder are reduced by 11%. According to the annual return powder amount of 480,000 tons, the qualified sinter and the return powder price difference of 160 yuan / t, the annual profit can be 8.448 million yuan.

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