# US 2019/0169705 A1 · Cast iron inoculant and method for production of cast iron inoculant

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- Number: US 2019/0169705 A1
- Document ID: US20190169705A1
- Status: Published application
- Kind: A1
- Application number: 16/314,116
- Filed: 2017-06-29
- Published: 2019-06-06
- Earliest claimed: 2016-06-30
- Assignees: Elkem ASA
- Applicants: Elkem Asa
- Inventors: Oddvar KNUSTAD
- Web page: https://patentgrep.com/patent/US20190169705A1

## CPC

- C21C 1/105: {Nodularising additive agents}
- C22C 28/00: Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
- C22C 33/04: by melting
- C22C 33/08: Making cast-iron alloys
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/005: {containing rare earths, i.e. Sc, Y, Lanthanides}
- C22C 38/02: containing silicon
- C22C 38/06: containing aluminium
- Y02P 10/20: Recycling
- C21C: PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

An inoculant for the manufacture of cast iron with lamellar, compacted or spheroidal graphite is disclosed. The inoculant has a particulate ferrosilicon alloy having about 40 to 80 wt % silicon, about 0.1 to 10 wt % calcium, 0 and 10% by weight of rare earths, for example cerium and/or lanthanum, and up to 5 wt % aluminium the balance being iron and incidental impurities in the ordinary amount, wherein the inoculant additionally has 0.1 to 10 wt %, based on the total weight of inoculant, antimony oxide where said antimony oxide is in particulate form and is mixed or blended with the ferrosilicon alloy particles, or is simultaneously added to cast iron together with the particulate ferrosilicon alloy particles.

## Claims

### Claim 1

An inoculant for the manufacture of cast iron with lamellar, compacted or spheroidal graphite wherein said inoculant comprises a particulate ferrosilicon alloy comprising between about 40 to 80 wt % silicon, between about 0.1 to 10 wt % calcium, between 0 and 10% by weight of rare earths, for example cerium and/or lanthanum, and up to 5 wt % aluminium the balance being iron and incidental impurities in the ordinary amount, wherein said inoculant additionally comprises 0.1 to 10 wt % Sb2O3, based on the total weight of inoculant, where said Sb2O3 is in particulate form.

### Claim 2 (depends on 1)

Inoculant according to claim 1, wherein the ferrosilicon alloy comprises between 45 and 60% by weight of silicon.

### Claim 3 (depends on 1)

Inoculant according to claim 1, wherein the ferrosilicon alloy comprises between 60 and 80% by weight of silicon.

### Claim 4 (depends on 1)

Inoculant according to claim 1, wherein the ferrosilicon alloy comprises between 0.5 and 5% by weight of calcium.

### Claim 5 (depends on 1)

Inoculant according to claim 1, wherein the ferrosilicon alloy comprises between 0.5 and 5% by weight aluminum.

### Claim 6 (depends on 1)

Inoculant according to claim 1, wherein the ferrosilicon alloy comprises up to 6% by weight of rare earths.

### Claim 7 (depends on 1)

Inoculant according to claim 1, wherein the inoculant comprises 0.2 to 5% by weight of particulate Sb2O3.

### Claim 8 (depends on 1)

Inoculant according to claim 1, wherein the rare earths are cerium and/or lanthanum.

### Claim 9 (depends on 1)

Inoculant according to claim 1, wherein the inoculant is in the form of a mixture or blend of the ferrosilicon alloy particles and the Sb2O3 particles.

### Claim 10 (depends on 1)

Inoculant according to claim 1, wherein the inoculant is in the form of agglomerates made from a mixture of the particulate ferrosilicon alloy particles and the Sb2O3 particles.

### Claim 11 (depends on 1)

Inoculant according to claim 1, wherein the inoculant is in the form of briquettes made from a mixture of the particulate ferrosilicon alloy particles and the Sb2O3 particles.

### Claim 12

A method for producing an inoculant for the manufacture of cast iron with lamellar, compacted or spheroidal graphite, comprising: providing a particulate ferrosilicon alloy comprising 40 to 80 wt % silicon, between about 0.1 to 10 wt % calcium, between 0 and 10% by weight of rare earths, for example cerium and/or lanthanum, and up to 5 wt % aluminium the balance being iron and incidental impurities in the ordinary amount, mixing with said particulate base alloy 0.1 to 10 wt %, based on the total weight of inoculant, Sb2O3 particles to produce said inoculant.