Back to results
US 2026/0274693 A1Published application
Method of producing alkali metal silicate with reduced metal levels
AssigneeEvonik Operations GmbH
InventorsEric G. Lundquist, Duenwu Hua
Life of this patent
Estimating the term…
Abstract
The present invention relates to method of producing alkali metal silicates with reduced heavy metals in a high temperature furnace fusion process by use of sustainable waste or recycled sand sources. The invention also relates to use of waste, used or recycled (e.g; waste foundry sand) either alone or blended with virgin sand for producing the alkali metal silicate.
Claims13
A method of producing an alkali metal silicate material,
- comprising:
- a) providing a silicon dioxide source or mixtures thereof,
- b) mixing said silicon dioxide source with an alkali base, selected from the group consisting of sodium carbonate, potassium carbonate, er lithium carbonate, and metal hydroxide,
- c) heating the mixture at a temperature above 1000° C. for 1-5 hours,
- d) dissolving resulting solid alkali metal silicate waterglass in water, and
- e) removing any resultant insoluble heavy metal complexes and/or salts from said alkali metal silicate mixture, wherein the silicon dioxide source comprises a waste sand, mixtures thereof, or a mixture of waste sand with virgin sand.
3 more elements
A method of producing alkali metal silicate, comprising:
- mixing waste sand as a sustainable source of silicon dioxide with an alkali base, and
- heating the mixture.
Dependencies are inferred from the claim text.