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Method for preparing carbonaceous autoreduction cold pressing block and application thereof

A technology for cold briquetting and raw materials, applied in the field of iron and steel smelting, can solve the problems of increasing the amount of slag and power consumption, and being difficult to popularize and apply.

Inactive Publication Date: 2009-09-09
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN101270410 discloses cold-consolidated pellets and a preparation method thereof. The main component of the produced cold-consolidated pellets is iron oxide. Since they do not contain carbon, they are mainly suitable for use as blast furnace ironmaking raw materials, and then as converter coolants or slag adjustment If it is used as electric furnace steelmaking, the recovery rate of metallic iron is only 20-40%, and it will increase the amount of slag and power consumption, so it is difficult to popularize and apply

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0011] The preparation method of the carbon-containing self-reducing cold briquette of the present invention comprises the following steps:

[0012] (1) The electric furnace dedusting ash, iron oxide scale and coke powder are mixed according to the mass ratio, wherein the iron oxide scale is 40-50%, the electric furnace dedusting ash is 20-30%, and the coke powder is 20-25%. Put the mixed material into the mixer, stir evenly, then add 5% to 8% of the mass ratio of the binder and mix thoroughly, then transfer it to the hopper, and slowly send the evenly stirred mixed material to the double-roller briquetting machine through the hopper for extrusion Press into blocks to form carbon-containing self-reducing cold briquettes with high strength.

[0013] (2) Place the carbon-containing self-reducing cold briquette prepared in the above steps in a dry environment at 50°C-100°C for 30-36 hours. During the curing and drying process of this step, a series of physical and chemical chang...

specific Embodiment approach

[0022] The present invention will be further described below in conjunction with the examples, but not limited thereto. The raw material technical index used in the embodiment is as follows:

[0023] Iron oxide scale: total iron content ≥ 70%, particle size ≤ 5mm.

[0024] Electric furnace dust: total iron content ≥ 50%, particle size 0.005 ~ 0.5mm ≥ 90%.

[0025] Coke powder: fixed carbon 75-85%, ash content ≤ 15%, particle size below 2mm.

[0026] Binder: lightly burned magnesia powder, in which MgO≥85%, SiO 2 ≤6%, particle size ≤0.12mm.

Embodiment 1

[0027] Embodiment 1, carbon-containing self-reducing cold briquette and its preparation

[0028] A carbon-containing self-reducing cold briquette, the mass ratio of raw materials is as follows: 47% of iron oxide scale, 22% of electric furnace dust, 25% of coke powder, and 6% of binder lightly burned magnesium oxide powder.

[0029] The preparation method is as follows:

[0030] Mix the electric furnace dust, iron oxide powder and coke powder according to the mass ratio of 47% iron oxide scale, 22% electric furnace dust and 25% carbon powder. Enter a 190-ton double-roller briquetting machine to extrude into a round flat briquette with a diameter of 30mm and a thickness of 10mm. After the briquette is made, it is placed in a dry environment at 50°C-100°C for 36 hours through a steam drying system for curing and drying to achieve high mechanical strength. The reduction test was carried out on the prepared cold briquette. In the high-temperature experimental furnace above 1100 ℃...

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Abstract

The invention relates to a method for preparing a carbonaceous autoreduction cold pressing block by using electric stove dust-removing ash and iron scales and the application thereof. The carbonaceous autoreduction cold pressing block comprises the following raw materials by the weight percent: 40 to 50 of iron scale, 20 to 30 of electric stove dust-removing ash, 20 to 25 of carbon powder and 5 to 8 of bonding agent. The method for preparing the carbonaceous autoreduction cold pressing block comprises the following steps: the raw materials are evenly stirred in proportion and are pressed and molded by a double-roll block-press machine of 190 tons, and a mold is placed in dry environment of above 50 DEG C for 30 to 36 hours to form the high-strength carbonaceous cold pressing block which is directly used for electric stove steelmaking smelting. The method has simple technology, low energy consumption, high strength and no environmental pollution. When the carbonaceous autoreduction cold pressing block is used in an electric stove, the recovery rate of metallic iron reaches 27 percent, and the method is beneficial to increase foam residues and dephophorization effect.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and relates to a method for recycling dust from electric furnaces, in particular to preparing carbon-containing self-reducing cold briquettes by using dust from electric furnaces and iron oxide scales. Background technique [0002] When the electric furnace is mixed with 40-60% hot molten iron, the total iron content in the dust removal dust of the electric furnace is about 50-60%, which is a valuable secondary resource containing iron. Recycling the dust removal dust of the electric furnace can minimize the iron resources in the smelting process of the electric furnace Loss and clean production are of great significance for enterprises to reduce emissions and increase efficiency. At present, there are few studies on the recycling of electric furnace dust in electric furnaces at home and abroad, and there is no literature report on the use of electric furnace dust and iron oxide scales to m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C22B1/243C21C5/52
CPCY02P10/20
Inventor 王广连申景霞李猛亓庆录孙树林倪友来叶黎华周艳丽韩政
Owner SHANDONG IRON & STEEL CO LTD
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