Method for recycling metal iron from slag magnetic separation powder

A technology for magnetic separation of steel slag and metal iron, which is applied in the field of recovering metal iron from magnetic separation powder of steel slag, can solve the problems of waste of iron resources, inappropriate magnetic separation process, low recovery rate of iron resources, etc., and achieves high iron oxide content. Effect

Active Publication Date: 2017-01-11
PANZHIHUA GANGCHENG GROUP
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Problems solved by technology

[0004] However, the magnetic separation process used in the existing steel slag magnetic separation production line is not appropriate, and the recovery rate of iron resources is low, resulting in a waste of iron resources

Method used

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Embodiment

[0028] The steel slag magnetic separation powder with a particle size less than 10mm and MFe of 15% is the main raw material, and the main raw material is crushed by a fine crusher for 5mm; Dry-type weak magnetic separation is used for sorting to obtain magnetic separation powder with 25% MFe; the magnetic separation powder with 25% MFe is fed into a wet ball mill for grinding; after grinding, it is sieved through a 20-mesh sieve and screened out The part above 20 mesh and the part below 20 mesh; the part above 20 mesh is magnetically separated by a 2800Gs semi-permanent magnetic roller to obtain iron particles with a TFe greater than or equal to 94%, and the part below 20 mesh passes through twice a 1200Gs semi-permanent magnetic roller. The permanent magnetic roller is used for roughing and refining to obtain fine iron powder with a TFe of 58%. The steel slag powder obtained after fine crushing and weak magnetic separation is used as cement iron correction material.

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Abstract

The invention belongs to the technical field of metal iron recycling and particularly relates to a method for recycling metal iron from slag magnetic separation powder. The method for recycling metal iron from slag magnetic separation powder provided by the invention comprises the following steps: taking the slag magnetic separation powder with grain size less than 15mm and MFe less than 25% as the main raw material and crushing; performing low intensity magnetic separation after crushing, thereby acquiring the magnetic separation powder with MFe more than or equal to 25%; grinding the magnetic separation powder and then grinding, thereby screening the part above 20 mesh and the part below 20 mesh; performing high intensity magnetic separation on the part above 20 mesh, thereby acquiring the iron grain with TFe more than or equal to 90%; performing twice low intensity magnetic separation on the part below 20 mesh, thereby acquiring the iron fine powder with TFe more than or equal to 55%. The reasonable crushing technique, screening technique, grinding technique and magnetic separation technique are adopted, so that the metal iron in the slag magnetic separation powder can be more effectively recycled; the ferric oxide content of the tailings is higher; the method can be more effectively applied to the cement irony correcting material.

Description

technical field [0001] The invention belongs to the technical field of metallic iron recovery, and in particular relates to a method for recovering metallic iron from steel slag magnetic separation powder. Background technique [0002] Converter steel slag is the liquid slag produced by the slagging process in the converter. The temperature is as high as 1600°C. It is mainly the gradual dissolution process of lime in the slag, and finally obtains a solid substance containing a large amount of solid solution phase SS, that is, one or more solutes. silicate slag. [0003] The pre-treatment process of steel slag is mainly based on hot stuffiness, which is a method of separating steel slag through temperature difference, that is, through the effect of "thermal expansion and contraction", that is, the surface of the slag lump shrinks rapidly when cooled by water, while the internal temperature is still high and the volume remains unchanged. , the shrinking surface produces "brok...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 范泽宇李贤书钱强
Owner PANZHIHUA GANGCHENG GROUP
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