Method and system for recovering products from steel slag

A technology for recycling products and slag, applied in chemical instruments and methods, wet separation, chlorine production, etc., to achieve improved utilization, enhanced conversion kinetics and conversion rate

Active Publication Date: 2019-09-03
THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] While current slag utilization in developed countries is often close to 100%, as recently as 2012, it was estimated that current slag utilization was only 22% in China and lower in many other countries

Method used

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  • Method and system for recovering products from steel slag
  • Method and system for recovering products from steel slag
  • Method and system for recovering products from steel slag

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Embodiment Construction

[0035] now refer to figure 1 , in some embodiments, the present disclosure relates to a system 1 for producing various products from steel slag. In some embodiments, a first source 100 of steel or iron slag is collected. In some embodiments, first source 100 is fed to grinding module 102 . In some embodiments, the first source 100 is fed to a magnetic separator 104 . In some embodiments, the separated fraction from the magnetic separator is fed to the slag processing module 108 . The slag processing module 108 produces a slurry 110 .

[0036] In some embodiments, the first precipitation module 112 communicates with the slag handling module 108 via at least a first recycle stream 114 .

[0037] In some embodiments, the slurry 110 is fed to an acid leach module 116, which produces dissolved leachate and slag residue. In some embodiments, separator 118 separates dissolved leachate and slag residue to produce at least one dissolved leachate stream 120 and slag residue product...

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Abstract

The present invention discloses a system and method for processing slag produced by the iron and steel manufacturing process. The slag is processed to produce a range of valuable industrial products such as metal oxides, metal carbonates, rare earth elements and water glass. The system and method also combine slag processing with CO 2 Storage and flue gas desulfurization integration. Processing slag minimizes the land used to store or bury waste generated by the steel manufacturing process and protects groundwater. In general, solid and gas emissions from industrial processes with high energy consumption and high pollution are greatly reduced, recycled and resourced, thus achieving the goal of nearly zero emissions.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 62 / 220,690, filed September 18, 2015, the entire disclosure of which is incorporated herein by reference. Background technique [0003] Steel slag is a by-product / waste in the steel manufacturing process which, if not fully utilized, can lead to pollution and other environmental problems. Typical slags include significant amounts of calcium, magnesium, silicon, iron and aluminum in various chemical compositions. The slag can also include various types of rare earth elements. [0004] Unused slag is often dumped or landfilled and can be a source of pollution and other environmental problems. In addition, depending on the source of iron ore, steel scrap, and coal, high iron content (in the form of iron oxides, up to 30-40% by weight) and various types of rare earth elements are often present in the slag. The improved utilization of the waste slag not onl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B02C23/14B03B7/00C22B7/04
CPCC22B7/04C21B3/08C22B59/00Y02P10/122Y02P10/20Y02P20/20B03C1/02B03C2201/20C22B1/248C25B1/16C25B1/26
Inventor A-H·A·帕克X·周
Owner THE TRUSTEES OF COLUMBIA UNIV IN THE CITY OF NEW YORK
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