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Method and hydraulic mineral binder for treating steel slag

A mineral binder, hydraulic technology, applied in the field of hydraulic mineral binder, can solve the problem that iron cannot be recycled

Active Publication Date: 2017-09-12
LOESCHE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A disadvantage of this method is that the iron present in the slag cannot be recovered and extensive cooling is necessary to stabilize the C produced. 3 S

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  • Method and hydraulic mineral binder for treating steel slag
  • Method and hydraulic mineral binder for treating steel slag
  • Method and hydraulic mineral binder for treating steel slag

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Embodiment Construction

[0059] The invention will be described in more detail below with the aid of exemplary embodiments with reference to the drawings.

[0060] exist figure 1 The feed is provided in step I of the flow diagram shown. The feed consists essentially of LD slag. The feed has a MnO content in the range between 1% and 5% by weight. Many LD slags, also known as SWS, already have a MnO content in the desired range. If not, add MnO to the slag. Other corrective substances can be added at this time or at other times, such as SiO 2 material to obtain the necessary lime saturation coefficient thereafter. During this step, a reducing agent may have been added to the feed. For example petroleum coke is suitable for this purpose.

[0061] In the subsequent step II, a process of processing the feed material into a melt can be carried out if desired. The slag can be obtained from upstream processes already in the liquid state of the melt, or it can also be present in cold solid form. The m...

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Abstract

The invention relates to a method for treating steel slag to produce a hydraulic mineral binder with high hardening properties and to recover iron. For this purpose it is provided that a feed material comprising steel slag and MnO is provided. The feed is further processed into a melt to which a reducing agent is subsequently added. A lime saturation factor of between 90 and 110 is thus achieved in the mineral melt fraction. Subsequently, the melt is cooled in a defined manner and the uncombined iron is mechanically separated from the solidified melt. The solidified melt is subsequently supplied as a hydraulic mineral binder.

Description

technical field [0001] The invention relates to a method for treating steel slag to produce a hydraulic mineral binder with high hardening properties and to recover iron. Background technique [0002] Steel slag, also known as LD slag, LSD (converter slag) or, electric furnace slag (EFS) or SWS (steel mill slag), may still contain very large amounts of iron, depending on the particular process. This iron is partly present in metallic form, but mainly in the form of oxides minerally bound in the steel slag. These iron oxides present in the slag cannot be recovered in a purely mechanical manner, since they are stably bound in the slag matrix and must first be converted into non-combined metal forms by thermochemical reduction. The steel slag matrix is ​​mainly composed of typical oxides such as calcium oxide, silicon dioxide and aluminum oxide. However, unlike other forms of slag, such as blast furnace slag, it does not generate a hydraulically active phase and is therefore ...

Claims

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Application Information

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IPC IPC(8): C22B7/04
CPCC22B7/04C04B5/06C04B7/147Y02P40/10C21B3/08Y02P10/20
Inventor 霍尔格·乌尔费特霍斯特迈克尔·路德维格
Owner LOESCHE GMBH