Methods of protecting furnace electrodes with cooling liquid that contains an additive

Patent metadata

Field	Value
Publication number	US-2023254953-A1
Application number	US-202318135433-A
Country	US
Kind code	A1
Filing date	Apr 17, 2023
Priority date	Oct 15, 2018
Publication date	Aug 10, 2023
Grant date	—

Abstract

A method for forming a protective antioxidative barrier on the furnace electrodes using a chemically altered cooling liquid containing an antioxidant additive. This method can be applied to electrodes used in electric arc furnaces and ladle metallurgy furnaces. The method can involve spraying the cooling liquid onto the electrode, thereby forming the protective antioxidative barrier and reducing the oxidation of the electrode.

First claim

What is claimed is:

1 . A method for protecting a furnace electrode comprising:
(i) combining at least one antioxidant additive with water to form a chemically modified liquid; (ii) spraying a hot surface of the furnace electrode with the chemically modified liquid, wherein the hot surface of the furnace electrode has a temperature of at least 700° C.; and (iii) while the hot surface of the furnace electrode is being sprayed with the chemically modified liquid, forming a coating on the hot surface of the furnace electrode by evaporating water from the chemically modified liquid that has been sprayed on the hot surface of the furnace electrode.

2 . The method of claim 1 , wherein the at least one antioxidant additive includes a polyphosphate.

3 . The method of claim 1 , wherein the at least one antioxidant additive includes one or more component selected from phosphates, phosphonates, calcium salts, magnesium salts, molybdates, boron salts, and silicates.

4 . The method of claim 1 , wherein the at least one antioxidant additive includes one or more component with a melting point of at least 2400° C.

5 . The method of claim 1 , wherein the hot surface of the furnace electrode has a temperature of at least 1000° C.

6 . The method of claim 1 , wherein the hot surface of the furnace electrode has a temperature of at least 1200° C.

7 . The method of claim 1 , wherein the chemically modified liquid is sprayed onto the hot electrode while a portion of the furnace electrode is positioned inside a furnace and another portion of the furnace electrode is positioned above the furnace.

8 . The method of claim 7 , wherein the chemically modified liquid is sprayed on the surface of the furnace electrode disposed above the furnace at a flow rate in the range of from 0.25 m 3 /h to 10 m 3 /h.

9 . The method of claim 1 , wherein the chemically modified liquid includes the at least one antioxidant in an amount in the range of from 10 mg/l to 5,000 mg/l.

10 . The method of claim 1 , wherein the chemically modified liquid includes the at least one antioxidant additive in an amount in the range of from 10 mg/l to 1,000 mg/l.

11 . The method of claim 1 , wherein the furnace electrode is an electric arc furnace electrode or a ladle metallurgy furnace electrode.

12 . The method of claim 1 , wherein the at least one antioxidant additive includes a calcium based salt.

13 . The method of claim 1 , wherein the coating has a thickness in a range of from 0.005 to 5 mm.

14 . The method of claim 1 , wherein the chemically modified liquid includes at least 95 wt. % water.

15 . The method of claim 1 , wherein the at least one antioxidant additive includes a transition metal salt.

16 . The method of claim 1 , wherein the chemically modified liquid is more than 99 wt. % water.

Assignees

• Chemtreat Inc

Inventors

• Strasser Joseph S
• Hamnik Joseph M
• Lawson James R
• Feller Alan J

Classifications

• H05B7/12 Primary

  Arrangements for cooling, sealing or protecting electrodes · CPC title

• C09K15/02

  containing inorganic compounds · CPC title

• F27D11/10

  Disposition of electrodes · CPC title

• H05B7/06

  Electrodes · CPC title

• B05D1/02

  performed by spraying · CPC title