High durability refractory composition

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Quick Facts

Patent No.: US 7,078,360
App. No.: 10/783,514
Granted: Jul 18, 2006
Kind: B2

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Abstract

A high temperature hot strength magnesia-based refractory composition having high durability at elevated temperatures wherein a sulfamic acid in combination with an independent calcia source is added to a magnesia-based refractory material. The invention also provides for a refractory gunning composition for use in the production or repair of metallurgical furnace linings.

Claims (39)

1. A refractory composition comprising:

(a) a magnesia based refractory material;

(b) sulfamic acid; and

(c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of total refractory composition.

2. The refractory composition of claim 1 wherein the calcium hydroxide concentration is between greater than 5.0 percent to about 7.0 percent by weight of the total refractory composition.

3. The refractory composition of claim 1 wherein the calcium hydroxide concentration is between 5.5 percent to about 6.5 percent by weight of the total refractory composition.

4. The refractory composition of claim 1 , further comprising calcium oxide in concentration between about 0.5 percent to about 1.0 percent by weight of the total refractory composition.

5. The refractory composition of claim 2 , further comprising calcium oxide in concentration between about 0.5 percent to about 1.0 percent by weight of the total refractory composition.

6. The refractory composition of claim 2 , wherein the sulfamic acid is from about 1.0 percent by weight to about 5.0 percent by weight of the total refractory composition.

7. The refractory composition of claim 6 , wherein the sulfamic acid is from about 2.0 percent by weight to about 4.0 percent by weight of the total refractory composition.

8. The refractory composition of claim 7 , wherein the sulfamic acid is from about 2.5 percent by weight to about 3.5 percent by weight of the total refractory composition.

9. The refractory composition of claim 1 wherein the sulfamic acid is from about 1.0 percent by weight to about 5.0 percent by weight of the total refractory composition.

10. The refractory composition of claim 9 wherein the sulfamic acid is from about 2.0 percent by weight to about 4.0 percent by weight of the total refractory composition.

11. The refractory composition of claim 10 wherein the sulfamic acid is from about 2.5 percent by weight to about 3.5 percent by weight of the total refractory composition.

12. A refractory gunning composition consisting essentially of:

a) a magnesia-based refractory;

b) sulfamic acid;

c) calcium hydroxide in concentration between greater than 5.0 percent to 8.0 percent by weight of total refractory composition; and

d) a wetting agent.

13. The gunning composition according to claim 12 , wherein the sulfamic acid concentration is from about 1.0 percent to about 5.0 percent by weight of the gunning composition;