Continuous injection electric furnace dedusting ash into-furnace comprehensive recovery system and recovery method thereof

A recovery system and recovery method technology, applied in the field of comprehensive utilization of solid waste resources, can solve the problems of slow reduction of pellets, long process flow, low metallization rate and dezincification rate, etc., to reduce slag input and metal recovery The effect of high efficiency and shortened smelting cycle

Pending Publication Date: 2021-12-14
马钢集团设计研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that: in order to ensure the reaction between the heavy metal-containing dust and the reducing agent, it is necessary to build an arc reactor to generate a high temperature of 1800 ° C, which consumes a lot of energy and is not conducive to low-energy production; more importantly, the smelting process produces The lead and zinc oxide powder formed by the oxidation of lead and zinc vapor in air needs to be collected by gravity dust removal, cooling, secondary cyclone dust removal and bag dust removal. The whole process is long and the maintenance is complicated in the later stage. good use
The disadvantage of this patent is that the reduction of the atmosphere in the rotary hearth furnace is not high, and the density of the pellets after adding the binder is high, and the reduction of the pellets is slow and insufficient, which will lead to metallization and dezincification The efficiency is not high, and the separation effect of iron and zinc is poor; the process of this method is long and the investment cost is high

Method used

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  • Continuous injection electric furnace dedusting ash into-furnace comprehensive recovery system and recovery method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Such as figure 1 As shown, the continuous blowing electric furnace dust removal ash entering furnace comprehensive recovery system in this embodiment includes the electric furnace system dust removal station 1, dust removal ash bin 2, conveyor 3, dryer 4, conveyor Machine two 5, powder material mixer 6, injection device 8 and electric arc furnace 9, said powder material mixer 6 is also communicated with reducing agent silo 7, and the upper part of said electric arc furnace 9 is connected with electric furnace dust collection cover 10, and said electric furnace The dust collection hood 10 is connected with the dust removal station 1 of the electric furnace system to form a circulation system for the entire dust removal ash; the dryer 4 is also connected with the high-temperature industrial waste gas station or the biomass fuel hot blast stove 12 through pipelines, so as to achieve the purpose of fully utilizing heat and energy . The dust-removing ash bin 2 is also conne...

Embodiment 2

[0053] The continuous blowing electric furnace dedusting comprehensive recovery system of this embodiment, the basic structure is the same as that of Embodiment 1, and it is applied to a 140t electric furnace production line. The electric furnace production line is equipped with an ultra-high-power electric arc furnace with an engineering capacity of 140t. Continuous feeding, electric arc furnace is characterized by flat molten pool smelting, especially refers to the horizontal continuous feeding electric furnace with scrap steel preheating, its smelting cycle is 40-45min, and the volume of 2 sets is 50m 3 Carbon powder injection tank, each carbon powder injection tank is connected to a set of furnace wall oxygen lance modules, which can work independently. The dedusting ash is collected by the dedusting station 1 of the electric furnace system. After sampling and testing, the mass percentages of the main components in the dedusting ash are as follows: TFe: 45.55%, CaO: 7.57%, ...

Embodiment 3

[0076] The basic structure of the continuous blowing electric furnace dust removal ash into the furnace comprehensive recovery system of this embodiment is the same as that of embodiment 2. Taking a 140t electric furnace production line as an example, the dust removal dust is collected by the dust removal station 1 of the electric furnace system, and the quality of the main components in the dust removal dust is 100%. The content is as follows: TFe: 43.2%, CaO: 8.5%, SiO 2 : 4.5%, Al 2 o 3 : 2.1%, MgO: 6.3%, Zn: 8.2%, Pb: 0.8%, K: 2.2%, etc., water content 5.5%.

[0077] The above-mentioned dedusting ash is continuously added to the ultra-fine powder drum dryer through a screw conveyor. According to the addition of 10kg of dedusting ash per ton of steel, the production capacity of the dryer is not less than 2.2t / h, and 150-200℃ industrial Exhaust gas is dried for 40 minutes, and the final moisture content is controlled below 3.0%.

[0078] The dried dedusting ash and carbon p...

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Abstract

The invention discloses a continuous injection electric furnace dedusting ash into-furnace comprehensive recovery system and a recovery method thereof, and belongs to the field of solid waste resource comprehensive utilization. The continuous injection electric furnace dedusting ash into-furnace comprehensive recovery system comprises an electric furnace system dedusting station, a dedusting ash bin, a first conveyor, a drying machine, a second conveyor, a powder stirring machine, a blowing device and an electric arc furnace which are sequentially arranged and communicated in the dedusting ash flow direction, the powder stirring machine is further communicated with a reducing agent bin, the upper portion of the electric arc furnace is communicated with an electric furnace smoke collecting cover, and the electric furnace smoke collecting cover is communicated with the electric furnace system dedusting station. A circulating system of the whole dedusting ash flow direction is formed; the dedusting ash in the whole circulating system can be circularly treated until volatile metal elements such as lead and zinc are reduced and oxidized, then enter the electric furnace system dedusting station again and are gathered to a preset percentage; and other oxides in the dedusting ash are also fused into slag, so that valuable metals are effectively separated and recycled, the yield of the metals in the dedusting ash of the electric furnace is improved, and meanwhile, the influence of heavy metal elements on the environment is reduced.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste resources, and more specifically relates to a comprehensive recovery system and a recovery method for continuously injecting dust removal ash into an electric furnace. Background technique [0002] Electric furnace dust is the product obtained when the flue gas is collected by the fourth hole and the dust cover during electric arc furnace smelting, and then introduced into the bag filter through the dust removal flue. The output of ash per ton of steel is about 10-20kg. As a by-product in the production process of electric furnace steelmaking, electric furnace dust is mainly composed of Fe oxides and non-ferrous metal oxides such as Zn, Pb, Ca, Mg, K, Na, etc. The content of TFe reaches 30% to 50%, and the content of lead, zinc The equivalent content is about 5% to 15%, which has a high recycling value. The heavy metal content in the dust removal ash of electric furnace is...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C21B13/00C21C5/52C21C5/54C22B7/02C22B13/02C22B19/20C22B19/30
CPCC21B13/0006C22B7/02C21C5/527C21B13/0066C21C5/54C22B7/001C22B13/025C22B19/20C22B19/30Y02P10/20
Inventor周庆子刘高朱兴华江新军侯玉伟王海鹏佘文文
Owner马钢集团设计研究院有限责任公司