# US 10,478,826 B2 · System and method for recovery of valuable constituents from steel-making slag fines

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- Number: US 10,478,826 B2
- Document ID: US10478826B2
- Status: Granted
- Kind: B2
- Application number: 14/997,769
- Filed: 2016-01-18
- Published: 2016-05-12
- Granted: 2019-11-19
- Earliest claimed: 2013-03-15
- Assignees: Fritz Enterprises, Inc.
- Applicants: Fritz Enterprises, Inc.
- Inventors: Raymond C. Fritz; Raymond J. Fritz
- Web page: https://patentgrep.com/patent/US10478826B2

## CPC

- B03B 9/04: specially adapted for furnace residues, smeltings, or foundry slags
- B02C 23/14: with more than one separator
- B03B 7/00: Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
- B03C 1/20: in the form of belts, e.g. cross-belt type
- B03C 1/30: Combinations with other devices, not otherwise provided for
- C22B 1/00: Preliminary treatment of ores or scrap
- C22B 7/04: Working-up slag
- Y02P 10/20: Recycling
- B03B: SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02})
- B03C: MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS (separating isotopes B01D59/00; combinations of magnetic or electrostatic separation with separation of solids by other means B03B, B07B)
- C22B: PRODUCTION AND REFINING OF METALS (electrolytic C25); PRETREATMENT OF RAW MATERIALS
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A system and method directed to the economical recovery of valuable iron constituents from iron blast furnace and steel-making slag fines wherein the slag is obtained and subjected to a series of classification steps which progressively sort the slag fines by various physical characteristics, including magnetism, size, and density, into relatively iron-rich and relatively iron-poor classifications, resulting in the isolation of iron-rich commercial byproduct at one or more of the classification steps.

## Claims

### Claim 1

A system for recovering relatively iron-rich material from slag fines, the system including:
a magnetic classifying station for receiving a first batch of material and separating the particles in the first batch into magnetic and non-magnetic groups;
a first size classifying station for receiving a second batch including the nonmagnetic group, and separating the particles in the second batch into a group of particles of size greater than or equal to about 10 mm and a group of particles of size less than about 10 mm;
a milling station for receiving a third batch including the group of particles of size less than about 10 mm and milling the particles in the third batch;
a second size classifying station for receiving the third batch and separating the particles in the third batch into a group of particles of size greater than or equal to about 1 mm and a group of particles of size less than about 1 mm; and
a hydraulic fluidized bed density separator for receiving a fourth batch including the group of particles of size less than about 1 mm and separating the particles in the fourth batch into a group of particles having a density in the range of about 5.0-6.0 g/cm3 and a group of particles having a density in the range of about 2.3-2.7 g/cm3.

### Claim 2

A system for recovering relatively iron-rich material from slag fines, the system including:
a magnetic classifying station for receiving a first batch of material having iron content and separating the particles in the first batch into magnetic and non-magnetic groups;
a first size classifying station for receiving a second batch including the nonmagnetic group, and separating the particles in the second batch into a group of particles of size greater than or equal to about 10 mm and a group of particles of size less than about 10 mm;
a crushing station for receiving a third batch including the group of particles of size less than about 10 mm and crushing the particles in the third batch;
a second size classifying station for receiving the third batch and separating the particles in the third batch into a group of particles of size greater than or equal to about 1 mm and a group of particles of size less than about 1 mm; and
a hydraulic fluidized bed density separator for receiving a fourth batch including the group of particles of size less than about 1 mm and separating the particles in the fourth batch into a group of particles having a density in the range of about 5.0-6.0 g/cm3 and a group of particles having a density in the range of about 2.3-2.7 g/cm3.

### Claim 3 (depends on 2)

The system of claim 2 wherein the crushing station includes a vertical shaft mill.