Method of increasing the stability of a slag

Patent metadata

Field	Value
Publication number	US-12122718-B2
Application number	US-202017611617-A
Country	US
Kind code	B2
Filing date	Apr 22, 2020
Priority date	May 17, 2019
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

Methods for increasing the stability of a slag using a source of silica and a source of boron ions, and compositions for use in said methods.

First claim

The invention claimed is:

1. A method of making a slag, the method comprising adding a composition to the slag and subsequently cooling the slag, wherein the composition comprises from about 6 wt % to about 25 wt % of a source of boron ions and from about 75 wt % to about 94 wt % of a source of silica; and a total amount of silica in the composition is about 35 wt % or more.

2. The method of claim 1 , wherein the composition has a melting point equal to or less than about 1200° C.

3. The method of claim 1 , wherein the slag is a steel slag.

4. The method of claim 1 , wherein the source of boron ions is borax, boric oxide (B 2 O 3 ), boron glass, colemanite, or a combination thereof.

5. The method of claim 1 , wherein the composition comprises at least about 50 wt % silica.

6. The method of claim 1 , wherein the composition comprises equal to or less than about 80 wt % silica.

7. The method of claim 1 , wherein the composition comprises equal to or greater than about 6 wt % and equal to or less than about 20 wt % boric oxide (B 2 O 3 ).

8. The method of claim 1 , wherein the composition is used in an amount equal to or greater than about 0.5 wt % and equal to or less than about 20 wt % based on the total weight of the slag.

9. The method of claim 1 , wherein source of boron ions and/or source of silica is used in an amount to produce a slag having a boron content equal to or greater than about 0.01 wt %, a calico-olivine content of equal to or less than about 55 wt %, or a larnite content equal to or greater than about 20 wt %.

10. The method of claim 1 , wherein the slag is a stainless steel slag.

11. The method of claim 1 , wherein source of silica is a glass, a mineral, or a combination thereof.

12. The method of claim 1 , wherein the composition has a melting point equal or less than about 900° C.

13. The method of claim 12 , wherein the source of boron ions is borax and the source of silica is a glass powder.

14. The method of claim 1 , wherein the composition has a melting point equal to or less than about 1200° C.

15. The method of claim 14 , wherein the source of boron ions is borax and the source of silica is a glass powder.

Assignees

• Imertech Sas
• Calderys France

Inventors

• Schulz Klaus
• Tavernier Hervé

Classifications

• C04B2111/00767

  for waste stabilisation purposes · CPC title

• C04B18/142

  Steelmaking slags, converter slags · CPC title

• C03C3/064

  containing boron · CPC title

• C03C10/0063

  containing waste materials, e.g. slags · CPC title

• C03C10/0054

  containing PbO, SnO2, B2O3 · CPC title