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Treatment method of oolitic hematite containing phosphorus

A technology of oolitic hematite and its treatment method, which is applied in the field of processing phosphorus-containing oolitic hematite, can solve the problems of high S content in iron powder, achieve high iron recovery rate, save grinding and pelletizing costs, and remove The effect of high removal rate

Active Publication Date: 2013-02-06
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of a large amount of sodium bicarbonate in this method causes the iron powder to contain too much S

Method used

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  • Treatment method of oolitic hematite containing phosphorus

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 10000g oolitic hematite (TFe ~43%, P~0.9%, Al 2 o 3 ~7%, SiO 2 ~22%), add 500g of additives (including 150g of NaCl, 50g of NaF, 300g of CaO) and 3000g of lignite, mix well and crush to less than 5mm, accounting for 96%, metallization and reduction roasting of scrap, control temperature 950℃, flue gas in the furnace Medium CO / CO 2 =3.8, residence time 1h, the output calcined sand is cooled to 500°C by the heat exchange cooling cylinder and then water-quenched. The water-quenched calcined sand is ball milled to less than 0.074mm, accounting for 94%. Magnetic separation under sterling to obtain concentrate iron powder (TFe~90%, P~0.13%, Al 2 o 3 ~1.7%, SiO 2 ~3.6%), in which the iron selection rate is ~89%, and the phosphorus removal rate is ~93%. The obtained iron powder is subjected to high-temperature melting, the temperature is controlled at 1550°C, and the constant temperature time is 2 hours to obtain high-quality molten iron (P~0.004%).

Embodiment 2

[0035] 20000g oolitic hematite (TFe ~43%, P~0.9%, Al 2 o 3 ~7%, SiO 2 ~22%), add 1200g of additives (of which KCl and MgCl 2 Total 400g, Fluorite 100g, CaCO 3 700g) and 4,500g of bituminous coal, mixed and crushed to less than 5mm, accounting for 97%, metallized reduction roasting of the scrap, controlled temperature 1000°C, CO / CO in the flue gas in the furnace 2 =4.0, residence time 2h, the output calcine is cooled to 520°C by heat exchange cooling cylinder and then water quenched. Magnetic separation under sterling to obtain concentrate iron powder (TFe~91%, P~0.12%, Al 2 o 3 ~1.6%, SiO 2 ~3.4%), in which the iron selection rate is ~90%, and the phosphorus removal rate is ~92%. The obtained iron powder is subjected to high-temperature melting, the temperature is controlled at 1580°C, and the constant temperature time is 1.5h to obtain high-quality molten iron (P~0.006%).

Embodiment 3

[0037] 10000g oolitic hematite (TFe ~43%, P~0.9%, Al 2 o 3 ~7%, SiO 2 ~22%), add 700g of additives (including NaCl and CaCl 2 A total of 210g, fluorite + borax 80g, CaO and Na 2 CO 3 A total of 410g) and 2500g of anthracite, mixed and crushed to less than 5mm accounted for 99%, metallized reduction roasting of the scrap, controlled temperature 1030°C, CO / CO in the flue gas in the furnace 2 =4.2, residence time 3h, the output calcine is cooled to 520°C by heat exchange cooling cylinder and then water quenched. Magnetic separation under sterling to obtain concentrated iron powder (TFe~90%, P~0.14%, Al 2 o 3 ~1.8%, SiO 2 ~3.9%), in which the iron selection rate is ~91%, and the phosphorus removal rate is ~92%. The obtained iron powder is subjected to high-temperature melting, the temperature is controlled at 1600°C, and the constant temperature time is 1h to obtain high-quality molten iron (P~0.004%).

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Abstract

The invention discloses a treatment method of oolitic hematite containing phosphorus and is characterized in that the treatment method sequentially comprising the steps of: (1) evenly mixing raw ore of oolitic hematite, an annexing agent and coal in proportion and then crushing; (2) conducting metallization reducing roasting on crushed ore in the step (1); (3) slowly cooling high temperature roasted products to 400-750 DEG C, then quickly cooling through water quenching, and conducting water quenching roasted product ball milling; (4) conducting magnetic selection after the ball milling to obtain iron powder and tailings; and (5) melting the iron powder obtained in the step (4) to obtain high-quality molten iron with phosphorus less than 0.01%. The raw ore in the treatment method does no need fine grinding, and thickness of the raw ore can be directly crushed to be -5mm, and the raw ore does no need pelletizing, only needs even mixing with the annexing agent and the coal, greatly saves ore grinding and pelletizing cost, special-grade high-quality molten iron with the phosphorus less than 0.01% is produced by melting, the molten iron can serve as a raw material for producing high-quality steel, and a product production value is high.

Description

technical field [0001] A method for processing phosphorus-containing oolitic hematite, which involves metallization reduction roasting-magnetic separation-melting of a phosphorus-containing oolitic hematite raw ore, simultaneous dephosphorization, aluminum, and silicon, and preparation of phosphorus-containing less than 0.01% The method of high-quality molten iron. Background technique [0002] Oolitic hematite is extremely finely distributed, and often coexists or wraps with siderite, oolitic chlorite and phosphorus-containing minerals. It is currently recognized as one of the most difficult types of iron ore at home and abroad. Domestic oolitic hematite and limonite resource reserves are very large, the two resources add up to 6 billion tons, of which 1 / 9 of the iron ore resource reserves is oolitic hematite. Oolitic hematite often forms large-scale mines, such as the Lorraine iron mine in France, the Clinton iron mine in the United States, the Xuanlong iron mine in north...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/02B03C1/015
Inventor 王成彦尹飞揭晓武陈永强阮书锋王振文杨永强居中军李强王军张永禄邢鹏
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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