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A method for producing pellets with low dust emission based on a high proportion of fine-grained materials

A technology of dust particles and fine particles is applied in the field of granulation of high-proportion fine-grained materials, which can solve the problem of high concentration of difficult-to-remove particles

Active Publication Date: 2021-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the existence of PM in the flue gas during the sintering of the pellet structure prepared by using a high proportion of fine-grained materials (fine-grained iron ore, iron-containing dust) in the prior art 10 , PM 2.5 Due to the high concentration of difficult-to-remove particles, the main purpose of the present invention is to provide a method to reduce PM in the sintering process by optimizing the granulation process. 10 , PM 2.5 This method optimizes the mixing and granulation performance of fine-grained materials, and couples and regulates the volatilization of heavy metals and alkali metals in iron-containing dust and sludge to suppress PM 10 , PM 2.5 generation, so as to achieve emission reduction in the sintering process

Method used

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  • A method for producing pellets with low dust emission based on a high proportion of fine-grained materials

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Experimental program
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Effect test

Embodiment 1

[0042] Weigh fine-grained iron ore, coarse-grained iron ore, gas ash, flux, coke powder, and returned ore by mass percentage, as shown in Table 1, wherein fine-grained iron ore, coarse-grained iron ore, gas ash The relative proportions are shown in Table 2. The fine-grained iron ore, flux, coke powder, and sodium carboxymethyl cellulose were mixed with a powerful mixer for 2 minutes, and the amount of sodium carboxymethyl cellulose added accounted for the amount of fine-grained iron ore, flux, and 0.05% of the total mass of coke powder; add an additive made of sodium carboxymethyl cellulose and slaked lime to the gas ash, and after mixing, use a compactor to press into 3-5mm particles, of which sodium carboxymethyl cellulose The proportions of slaked lime and slaked lime accounted for 0.5% and 0.5% of gas ash respectively; the coarse iron ore and flux were mixed with a cylinder mixer for a mixing time of 3 minutes; The granules mixed or compressed by the mixer are sent to the...

Embodiment 2

[0044] Weigh fine-grained iron ore, coarse-grained iron ore, gas ash, flux, coke powder, and returned ore by mass percentage, as shown in Table 1, wherein fine-grained iron ore, coarse-grained iron ore, gas ash The relative proportions are shown in Table 2. The fine-grained iron ore, flux, coke powder, and sodium carboxymethyl cellulose were mixed with a powerful mixer for 2.5 minutes, and the amount of sodium carboxymethyl cellulose added accounted for half of the fine-grained iron ore and flux. , 0.05% of the total mass of coke powder; add an additive made of sodium carboxymethyl cellulose and slaked lime to the gas ash, and after mixing, use a compactor to press it into 3-5mm particles, of which carboxymethyl cellulose The addition ratio of sodium and slaked lime accounted for 0.5% and 0.5% of gas ash respectively; the coarse iron ore and flux were mixed with a cylinder mixer for 3.5 minutes; The granules mixed or compressed by the cylinder mixer are sent to the cylinder m...

Embodiment 3

[0046] Weigh fine-grained iron ore, coarse-grained iron ore, gas ash, flux, coke powder, and returned ore by mass percentage, as shown in Table 1, wherein fine-grained iron ore, coarse-grained iron ore, gas ash The relative proportions are shown in Table 2. The fine-grained iron ore, flux, coke powder, and sodium carboxymethyl cellulose were mixed with a powerful mixer for 2.5 minutes, and the amount of sodium carboxymethyl cellulose added accounted for half of the fine-grained iron ore and flux. , 0.10% of the total mass of coke powder; add an additive made of sodium carboxymethyl cellulose and slaked lime to the gas ash, and after mixing, use a compactor to press into 3-5mm particles, of which carboxymethyl cellulose The addition ratio of sodium and slaked lime accounted for 0.8% and 1.0% of gas ash respectively; the coarse iron ore and flux were mixed with a cylinder mixer for 3.5 minutes; The granules mixed or compressed by the cylinder mixer are sent to the cylinder mixe...

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Abstract

The invention discloses a method for producing pellets with low dust emission based on a high proportion of microfine materials. Mixing to obtain mixed material I; mixing raw materials including coarse-grained iron ore and returned ore to obtain mixed material II; 2) pressing raw materials including iron-containing dust, binder A and slaked lime into granular materials ; 3) Mixing the mixed material I, the granular material and the mixed material II to granulate, and adding the binder B solution by spraying during the granulation process to obtain granules. This method optimizes the mixing and granulation performance of fine-grained materials, and couples and regulates the volatilization of heavy metals and alkali metals in iron-containing dust and sludge to suppress PM. 10 , PM 2.5 The generated amount, so as to realize the efficient emission reduction of its process.

Description

technical field [0001] The invention relates to a method for granulating high-proportion fine-grained materials, in particular to a method for preparing low PM from high-proportion fine-grained materials 10 , PM 2.5 A method for discharging pellets belongs to the sintering industry in the iron and steel metallurgy field. Background technique [0002] The steel industry is a major PM 10 , PM 2.5 Fixed emission sources, and in the entire iron and steel smelting process, sintering is the first high-temperature process, and the waste emissions account for more than 40% of the total waste in the smelting process, and the PM discharged with the flue gas 10 , PM 2.5 It also accounts for more than 40% of the emissions of the entire steel industry. Due to PM 10 , PM 2.5 Small particle size, large specific surface area, easy to discharge in sintering flue gas, easy to load heavy metals, alkali metal elements and persistent organic pollutants dioxins removed during sintering, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/244C22B1/243
CPCC22B1/2406C22B1/243C22B1/244
Inventor 季志云范晓慧甘敏李强吴明陈许玲黄晓贤孙增清武钰丰袁礼顺黄斌斌
Owner CENT SOUTH UNIV