Method for purifying powdered iron from steel-smelting sewage sludge coarse grain

A technology of steelmaking sludge and coarse particles, which is applied in the improvement of process efficiency, recycling technology and other directions, can solve the problems that metal iron cannot be effectively used and wasted, and achieves improved utilization value, short process and good effect. Effect

Inactive Publication Date: 2008-06-11
武汉钢铁有限公司
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Problems solved by technology

[0002] The coarse particles of sludge from converter steelmaking in steel plants contain

Method used

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Embodiment Construction

[0024] This embodiment is a method for purifying iron powder from steelmaking sludge coarse particles, which includes the following steps in turn:

[0025] a. Magnetic separation;

[0026] The coarse particles of steelmaking sludge are magnetically separated in a magnetic separator with a magnetic field strength of 280-320mT;

[0027] Coarse particles of converter steelmaking sludge contain about 30% metallic iron (MFe). Due to the particularity of its production, the particle surface is severely oxidized and contains a lot of impurities. The coarse particles of converter steelmaking sludge are mixed with water in the mixing drum, and then pumped to the wet magnetic separator with mortar, and magnetic separation is performed under the condition of a magnetic field strength of 280-320mT to remove non-metallic impurities, and the metal of the raw material can be separated. Iron MFe increased from 30% to about 50%.

[0028] b. Ball milling;

[0029] Then the magnetically separ...

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Abstract

The invention discloses a method for purifying iron powder from coarse-particles of steel-smelting sludge, and relates to the method for effectively reclaiming and re-using the coarse-particles of the steel-smelting sludge in iron and steel industry. Aiming at a problem at present that metallic iron in the coarse-particles of the steel-smelting sludge isn't utilized effectively, the invention provides the method for purifying the iron powder from the coarse-particles of the steel-smelting sludge, which comprises steps of selecting magnetically, ball-grinding, sorting through gravity, drying, screen-classifying, reducing finely, bruising, combining and the like. The iron powder with MFe>=90% and TFe>=96% is separated successfully from the steel-smelting sludge through the invention, the iron power with TFe>=98% which can be used for welding rods and the like can be obtained, the utilizing value of the coarse-particles of steel-smelting sludge of rotary stoves can be increased greatly, the utilizing fields of the coarse-particles of steel-smelting sludge of rotary stoves can be developed, and according to industrial experiments and productions, the method is certified to be the method for producing the iron powder with little investment, short technological process, low cost and good benefits, and thereby the invention is beneficial to be extended and applied.

Description

technical field [0001] The invention relates to a method for effectively recycling steelmaking sludge coarse particles in the iron and steel industry. Background technique [0002] The coarse particles of sludge from converter steelmaking in steel plants contain about 30% metallic iron (MFe). Iron cannot be used efficiently and there is a huge waste. [0003] Chemical composition of steelmaking sludge coarse particles (wt%) [0004] TF MFe C SiO 2 MnO CaO MgO P S 50～65 15～35 1～1.6 1～2 0.5～1.2 8～12 3～8 0.07 0.08 Contents of the invention [0005] Aiming at the problem that the metal iron in the steelmaking sludge coarse particles has not been effectively utilized, the present invention provides a method for purifying iron powder from the steelmaking sludge coarse particles, which can purify the iron powder contained therein to obtain ...

Claims

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Application Information

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IPC IPC(8): B22F8/00B22F9/04C22B7/04
CPCY02P10/20Y02W30/50
Inventor 王爱华李信平陈秀丽张怀泉龙光辉
Owner 武汉钢铁有限公司
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