US 12,110,232 B2Granted

Method for producing technical silicon

AssigneeWacker Chemie AG

InventorsKarl-Heinz Rimboeck, Konrad Mautner

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Abstract

Technical silicon is produced by heating a raw material mixture comprising particulate silicon metal-containing material and a particulate mediator containing at least one of C, O, Al, Ca and Si, to at least 1490° C., forming a liquid silicon phase, and solidifying this phase, wherein the raw material mixture a characteristic number K of from 0.000 to 60, calculated as follows: K = m ⁡ ( SiM ) · d ⁢ ⁢ 50 ⁢ ( SiM ) + m ⁡ ( Med ) · d ⁢ ⁢ 50 ⁢ ( Med ) m ⁡ ( SiM ) + m ⁡ ( Med ) · φ ( equation ⁢ ⁢ 1 ) where m (SiM) is the mass of the silicon metal-containing material in the batch m(Med) is the mass of the mediator d50,SiM is the mean particle size of the silicon metal-containing material, d50,Med is the mean particle size of the mediator, and φ is the mean porosity of the silicon metal-containing material.+

Claims17

Dependent claims

A method for producing technical silicon, comprising:

heating a particulate raw material mixture comprising particulate silicon metal-containing material and a particulate mediator which comprises at least one of the elements C, O, Al, Ca and Si,
to at least 1490° C., forming a liquid silicon metal phase, and
solidifying the liquid silicon metal phase,
wherein the particulate raw material mixture is characterized by a characteristic number K,
K having a value of 0.000 to 60 mm and being calculated as follows:
K
=
m
⁡
(
SiM
)
·
d
⁢
50
⁢
(
SiM
)
+
m
⁡
(
Med
)
·
d
⁢
50
⁢
(
Med
)
m
⁡
(
SiM
)
+
m
⁡
(
Med
)
·
φ
(
equation
⁢
1
)
where
m(SiM) is the mass of the silicon metal-containing material
m(Med) is the mass of the mediator in the raw material
mixture
d50,SiM is the particle size (diameter) in mm at 50% of the mass undersize of the grading curve of the silicon metal-containing material,
d50,Med is the particle size (diameter) in mm at 50% of the mass undersize of the grading curve of the mediator, and
φ is the mean porosity of the silicon metal-containing material,
where the silicon-containing material is not subjected to further purification steps.

57 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/598,412Filed 27 Mar 2019
Published: US 2022/0162078 A126 May 2022
Granted: 8 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

C01B 33/037
Silicon: purification
C01P 2006/80
Physical properties of inorganic compounds: compositional purity
C01B
Non-metallic elements
C01P
Indexing scheme relating to structural and physical aspects of solid inorganic compounds

Family

US 2022/0162078 A1Pre-grant publication · published 26 May 2022
US 12,110,232 B2This patent

From the US filing history. Foreign family members aren’t listed.

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