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Reinforced sintering method for upper material layer

A technology of strengthening sintering and material layer, which is applied in the field of iron ore sintering in the metallurgical industry, can solve the problem of uneven heat distribution, achieve balanced heat distribution, prolong retention time, improve sintering capacity and sinter quality

Pending Publication Date: 2022-04-12
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem of serious uneven heat distribution in the height direction of the material layer caused by the automatic heat storage effect of the belt-type sintering machine in the prior art, and to provide a method for strengthening the sintering of the upper material layer, which can effectively balance the sintered material layer Heat distribution in the middle height direction, improving the performance of the upper layer of particles, increasing the yield of the upper material layer of the sinter mixture, and thus increasing the yield of the overall sintered ore

Method used

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  • Reinforced sintering method for upper material layer
  • Reinforced sintering method for upper material layer
  • Reinforced sintering method for upper material layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for strengthening the sintering of the upper material layer in this embodiment includes the following steps:

[0031] S1. Mixing of main ingredients: mix ore, flux and fuel, miscellaneous materials, blast furnace return ore, and internal return ore for batching, and the prepared materials are uniformly mixed once and granulated twice to obtain the secondary mixture for sintering; The main ingredient mixing process can be specifically determined according to practical requirements, and is a well-known conventional technology in the industry, and will not be described in detail;

[0032] S2. Mixing of auxiliary ingredients: batching of magnetic concentrate, flux and fuel, and mixing the prepared materials to obtain the primary mixture of sintering upper layer; the mixing process of auxiliary ingredients is determined according to actual needs, and is a well-known conventional technology in the industry ,No longer;

[0033] S3. Tertiary mixing: add the sintered u...

Embodiment 2

[0044] A kind of upper material layer strengthened sintering method of this embodiment is basically the same as embodiment 1, the difference is that in this embodiment, the height of the sintered secondary mixture layer is 75% of the total sintered layer thickness, and the sintered tertiary mixture layer height is 25% of the total layer thickness is sintered. More specifically, in this embodiment, only within the first third of the length of the sintering machine, the opening of the damper is gradually increased along the forward direction of the trolley, and the negative pressure of the draft is adjusted to gradually decrease to the negative pressure of sintering. Two-stage pressure regulation, the negative pressure adjustment scheme is shown in Table 1 below, and the sintering effect after implementation is shown in Table 2 below:

[0045] Table 1 Sintering ventilation negative pressure adjustment scheme

[0046]

[0047] Table 2 Sintering technology and quality indicato...

Embodiment 3

[0051] A kind of upper material layer strengthening sintering method of this embodiment is basically the same as embodiment 1, the difference is that in this embodiment, the height of the sintered secondary mixture layer is 50% of the sintered total layer thickness, and the sintered tertiary mixture layer height is Sinter 50% of the total layer thickness. More specifically, in this embodiment, the fuel content in the sintered secondary mixture is controlled to be 0.6% lower than the fuel content in the sintered monolithic mixture; the fuel content in the sintered tertiary mixture is 0.6% higher than the fuel content in the sintered monolithic mixture; Or: the alkalinity of the sintered secondary mixture is 0.3 lower than that of the sintered overall mixture; the alkalinity of the sintered tertiary mixture is 0.3 higher than that of the sintered overall mixture; or: the ratio of the magnetic concentrate in the sintered secondary mixture is sintered The overall magnetic concentr...

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Abstract

The invention discloses an upper material layer reinforced sintering method, and belongs to the field of iron ore sintering in the metallurgical industry. Different burdening ratios are adopted for the sintering secondary mixture and the sintering tertiary mixture respectively, mixtures suitable for sintering production of the middle lower layer and the upper layer can be obtained, and then air draft negative pressure adjustment suitable for sintering of the upper material layer is supplemented, so that the high-temperature area retention time of the sintering upper layer is prolonged, the middle lower layer level is achieved, and the sintering quality is improved. And the sintering temperature difference of the upper, middle and lower layers is greatly reduced, and heat distribution in each layer is balanced, so that the sintering capacity and the sinter quality are improved. The problem that heat distribution in the height direction of a material layer is seriously uneven due to the air draft sintering automatic heat storage effect of a belt type sintering machine in the prior art is solved, heat distribution in the height direction of the sintered material layer can be effectively balanced, the performance of upper-layer particles is improved, the yield of the upper material layer of the sintered mixture is increased, and the production cost is reduced. And the yield of the whole sintered ore is further improved.

Description

technical field [0001] The invention relates to the technical field of iron ore sintering in the metallurgical industry, and more specifically relates to a method for strengthening sintering of an upper material layer. Background technique [0002] The iron ore sintering process mixes powdered iron ore, solid fuel (such as coke powder or coal powder) with flux, adds water and granulates them, and loads them into the sintering machine trolley through the distributor. After ignition, under the action of draft Sintering is carried out from top to bottom, and sintered into massive sinter under the condition of incomplete melting. With the development of sintering technology, the height of the material layer of the sintering machine is continuously increasing, and the automatic heat storage effect of the draft sintering is more obvious, resulting in a large difference in the heat distribution in the direction of the material layer height, with less heat in the upper layer and mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 武轶李帮平张晓萍袁鹏
Owner MAANSHAN IRON & STEEL CO LTD
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