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A method for preparing chemical iron powder from desulfurization slag iron

A technology for desulfurization slag and iron powder, applied in chemical instruments and methods, solid separation, grain processing, etc., can solve the problems of low metallic iron content, complex technological process, and high production cost, and achieve high metallic iron content and simple technological process , high-grade effect

Active Publication Date: 2019-03-15
MAANSHAN IRON & STEEL CO LTD
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  • Claims
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Problems solved by technology

[0007] Due to the low content of metallic iron in the existing iron powder production technology, it needs to go through a reduction process, and some even reduce twice to improve the grade of iron powder, resulting in complicated process and high production cost

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  • A method for preparing chemical iron powder from desulfurization slag iron

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Embodiment 1

[0028] A method for preparing chemical iron powder from desulfurized slag iron, comprising the following steps:

[0029] 1) Vacuum dry the desulfurized slag and iron at 90-120°C for 2-4 hours, and then perform ball milling pretreatment to peel off the rust layer and non-metallic impurities on the surface. The pretreatment time is 15-30 minutes.

[0030] 2) The pretreated slag and iron pass through 2.36mm and 0.425mm (40 mesh) square hole sieves, the ball milling time for the part above the 2.36mm sieve is 30 to 60 minutes, and the slag iron between 0.425 and 2.36mm is ball milled for 15 to 30 minutes. Separately ball mill finely into iron powder;

[0031] 3) The iron powder below 0.425mm is mixed with the finely crushed iron powder in step 2) and divided into three grades of 40-80 mesh, 80-120 mesh and 120-200 mesh; the 40-80 mesh iron powder is air-selected , the wind speed is 4.1-5.4m / s; the iron powder after winnowing is subjected to magnetic separation, the magnetic field...

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Abstract

The invention provides a method for preparing chemical engineering iron powder from desulfuration residue iron. Compared with the prior art, the method is advantageous in that the chemical engineeringiron powder is prepared by using the desulfuration residue iron as raw materials, the technological process is simple, and the obtained chemical engineering iron powder is high in grade, small in harmful impurity element content and wide in application. Through the preparation method, the grade of the iron is improved continually, and the content of the metal iron reaches 87.3% finally. The ironpowder prepared through the method provided by the invention is high in metal iron content, low in heavy metal content and content of nonmetallic impurities such as sulfur, small in granularity, and capable of completely meeting standard requirements of the chemical engineering iron powder industry and being widely applied to the chemical industries of titanium dioxides, wastewater treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of iron powder production, and in particular relates to a method for preparing chemical iron powder from desulfurized iron slag. Background technique [0002] There is generally a molten iron desulfurization process before the steelmaking process. There are many ways to treat the desulfurization slag produced by the desulfurization of molten iron. Maanshan Iron and Steel currently adopts the drip irrigation method, and the desulfurization slag after treatment is recovered by dry or wet ball mill magnetic separation. iron), and desulfurized slag iron is returned to steelmaking for use. Due to the high sulfur content, it not only affects the quality of molten steel, but also increases the cost of steelmaking. [0003] At present, the reducing agent in the titanium dioxide industry and the sewage treatment in electroplating, tanning, papermaking and other industries need to use chemical iron powder, and the an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C17/18B02C23/16B02C23/20B02C23/14B03C1/30
CPCB02C17/18B02C17/185B02C17/1855B02C17/1865B03C1/30
Inventor 桂满城饶磊刘自民张耀辉马孟臣
Owner MAANSHAN IRON & STEEL CO LTD
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