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Smoke circulation type pre-reduction sintering technique and device

A technology of flue gas circulation and sintering machine, which can be used in the improvement of process efficiency, lighting and heating equipment, waste heat treatment and other directions, and can solve the problems of difficulty in utilization of high-phosphorus iron ore resources and so on.

Active Publication Date: 2017-01-04
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, phosphorus, as one of the main harmful elements in the iron and steel smelting process, must be removed, but the current iron and steel production process can only dephosphorize in the process of beneficiation and steelmaking, which is the main reason for the difficulty in utilizing the abundant high-phosphorus iron ore resources The reason is that if it is possible to directly dephosphorize during the sintering process and reduce the impact of phosphorus on subsequent process equipment and product quality, it will help the development and utilization of high-phosphorus iron ore resources

Method used

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  • Smoke circulation type pre-reduction sintering technique and device
  • Smoke circulation type pre-reduction sintering technique and device
  • Smoke circulation type pre-reduction sintering technique and device

Examples

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Embodiment 1

[0060] An iron ore flue gas circulation type pre-reduction sintering method comprises the following steps:

[0061] 1) Mix iron ore powder (i.e., vanadium-titanium magnetite concentrate) and coke powder (or coal powder) and then pelletize by briquetting or disc pelletizing to obtain pellets with internal carbon, wherein the coal ore ratio is 0.18:1(wt), the average pellet diameter is 6mm;

[0062] 2) Use iron ore powder (i.e. common iron ore powder, which can be powder ore or a mixture of powder ore and concentrate), flux (it includes a mixture of three raw materials, limestone, limestone and serpentine; this The dosage ratio of the three raw materials makes it possible to control CaO and SiO in the process of sinter preparation 2 The weight ratio is about 1.2:1) and coke powder for batching (obtaining dry material), wherein the ratio of iron ore powder, flux and coke fuel is 83:12:5; then, add in a mixer based on dry 7wt% water of the total weight of the base material is mi...

Embodiment 2

[0076] Repeat Example 1, just adopt high-phosphorus iron ore powder instead of iron ore powder to make inner carbon pellets. Add a phosphorus collector 13 on the large flue pipe L2. By analyzing the phosphorus content of the high-phosphorus iron ore powder and the phosphorus content of the pellets in the pre-reduced sinter, the dephosphorization rate of the pellets was measured to be 75wt%.

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Abstract

The invention provides a smoke circulation type pre-reduction sintering device and method. The pre-reduction sintering method comprises the steps that (1) pelletizing is conducted after iron fine powder and coal fuel are evenly mixed, so that carbon-burdened pellets are obtained; (2) iron ore powder, a solvent and coal fuel powder are proportioned, and then water is added into a primary mixing machine for mixing, so that a sintering mixture is obtained; (3) the carbon-burdened pellets, the sintering mixture and additional coal fuel fine powder are mixed in a secondary mixing machine, so that a pre-reduction sintering mixture is obtained, wherein the use amount ratio, by weight, of the sintering mixture to the carbon-burdened pellets to the additional coal fuel fine powder is (50-70):(28-48):(1-5); (4) the pre-reduction sintering mixture is arranged on a sintering trolley for conducting smoke circulation type pre-reduction sintering; and (5) pre-reduction sintered ore obtained after sintering is cooled under an anaerobic condition.

Description

technical field [0001] The invention relates to a flue gas circulation pre-reduction sintering process and device for iron ore. Background technique [0002] At present, blast furnace ironmaking is the main technology in my country, sintering ore accounts for 70% to 90% of the raw materials into the furnace, and the energy consumption of sintering process accounts for 10% to 15% of ironmaking energy consumption. Inferior question. Traditional sintering process such as figure 1 As shown, the traditional iron ore sintering process mainly uses coke powder and anthracite as fuel to provide heat for the sintering process, and adopts the method of draft sintering to produce high-alkalinity sinter with calcium ferrite as the binder phase. [0003] Chinese patents CN101343689B, CN101608256B, CN101921909B, CN102127636B, CN102676797B and Chinese patent publication CN103911507A disclose the preparation method of sintered ore. [0004] In addition, CN1940092A and CN100532579C disclose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16F27D17/00
CPCY02P10/25
Inventor 胡兵王兆才叶恒棣贺新华孙英周志安
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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