	US 12,291,764 B2
	Silicon based alloy, method for the production thereof and use of such alloy
Amelie Dieudonne, Ste Colombe (FR); and Ole Svein Klevan, Stjordal (NO)
Assigned to ELKEM ASA, Oslo (NO)
Filed by ELKEM ASA, Oslo (NO)
Filed on Apr. 25, 2023, as Appl. No. 18/306,647.
Application 18/306,647 is a division of application No. 17/044,950, abandoned, previously published as PCT/NO2019/050067, filed on Apr. 2, 2019.
Claims priority of application No. 20180441 (NO), filed on Apr. 3, 2018.
Prior Publication US 2023/0257858 A1, Aug. 17, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C22C 38/02 (2006.01); C22C 28/00 (2006.01); C22C 33/04 (2006.01); C22C 33/06 (2006.01); C22C 35/00 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01)

CPC C22C 38/02 (2013.01) [C22C 28/00 (2013.01); C22C 33/04 (2013.01); C22C 33/06 (2013.01); C22C 35/00 (2013.01); C22C 38/002 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01)]

8 Claims

1. A method for producing a silicon based alloy comprising

between 45 and 95% by weight of Si;

max 0.05% by weight of C;

0.01-10% by weight of Al;

0.01-0.3% by weight of Ca;

max 0.10% by weight of Ti;

1-25% by weight of Mn;

0.005-0.07% by weight of P;

0.001-0.005% by weight of S;

the balance being Fe and incidental impurities in the ordinary amount, wherein said method comprises:

providing a liquid base ferrosilicon alloy comprising

Si: 45-95 wt %;

C: up to 0.5 wt %;

Al: up to 2 wt %;

Ca: up to 1.5 wt %;

Ti: 0.01-0.1 wt %;

Mn: up to 0.5 wt %;

P: up to 0.02 wt %;

S: up to 0.005 wt %;

the balance being Fe and incidental impurities in the ordinary amount,

adding a Mn source in the form of high carbon ferromanganese alloy having a carbon content of from 6 to 9 wt %, medium carbon ferromanganese alloy having a carbon content of from 1 to 2 wt %, low carbon ferromanganese alloy having a carbon content of about 0.5 wt %, Mn metal, or a mixture thereof, into said liquid ferrosilicon thereby obtaining a melt, and

refining said obtained melt, the refining comprising removing formed silicon carbide particles before and/or during casting of said melt.