Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer

Abstract

The invention provides a novel sintering technology for an acidic pellet and alkaline material mixed ultra-thick material layer. The sintering technology contains the following components: 3%-8% of an acidic pellet ore (green ball) with the particle size of 5-8 mm, 10%-15% of an acidic pellet ore (green ball) with the particle size of 8-10 mm, 15%-25% of an acidic pellet ore (green ball) with the particle size of 10-12.5 mm, 2%-5% of an acidic pellet ore (green ball) with the particle size of greater than 12.5 mm, and 50%-70% of an alkaline material (according to the weight percentage). On one hand, the air permeability of a sintered material layer can be improved, the oxidizing atmosphere is strengthened, the thickness of the sintered material layer is increased, and the purposes of improving production and quality and saving energy are achieved; and on the other hand, heat in the sintering process can be fully utilized, a sintered ore with suitable basicity is produced, the production process is shortened, and the production economic benefit is increased. Therefore, the novel acid and alkali mixed ultra-thick material layer sintering technology can be speculated to be capable of improving the air permeability of the material layer, thickening the sintered material layer, strengthening the oxidizing atmosphere and effectively improving the utilization coefficient of a sintering machine, so as to allow sintering production to achieve the purposes of saving energy consumption and improving the sintering quality.

Description

technical field [0001] The patent of the invention relates to a new technology for sintering a 1000mm ultra-thick material layer by mixing acidic pellets and high-alkalinity materials, and is especially suitable for the sintering field of iron and steel enterprises. Background technique [0002] In 2012, China's iron output reached more than 700 million tons, which will inevitably consume a large amount of iron-containing raw materials. At present, most of the blast furnaces in my country's iron and steel plants are mainly based on high-alkalinity sintered ore, and acid pellets and natural rich ore are added. Furnace charge structure. Therefore, improving the quality of the charge, saving energy and reducing consumption, and saving costs are the top priorities. [0003] With the continuous increase of my country's steel production and the subsequent shortage of raw materials, some problems have also appeared in the existing raw material production processes and technologies:...

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Problems solved by technology

[0003] With the continuous increase of my country's steel production and the subsequent shortage of raw materials, some problems have also appeared in the existing raw material production processes and technologies: 1) With the increase of sinter grade and SiO 2 2) The amount of lump ore that meets the requirements of blast furnace smelting in acidic ore cannot meet the requirements, and the acidic material of blast furnace is mainly pelletized ore

Pellets have strict requirements on raw materials and high processing costs, which increase the cost of blast furnace smelting; 3) Acid ore and high-basic sintered ore are loaded into the blast furnace separately, which makes the assimilation process of the charge in the blast furnace slow, which is not conducive to the enhanced smelting and cost of the blast furnace 4) The output of the sintering machine is high, the requirements for raw materials are relatively broad, and the cost is low, but the energy consumption is high and the pollution is serious; 5) Sintering and pelletizing have their own advantages, but the mineralization mechanism and roasting process are different. Large enterprises generally have sintering 1. Two sets of technological processes for pelletizing, resulting in high investment, large land occupation, difficulties in production organization, and high production costs; 6) Thick material layer sintering is an effective means to increase the output of sintering machines, reduce costs and reduce pollution

However, sintered materials of the same nature have the same melting properties. As the thickness of the material layer increases, the heat storage is strengthened. The heat in the lower part of the material layer is excessive. decline

Therefore, the current sintering process is difficult to achieve ultra-thick material layer (≥1000mm) sintering

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