Settable Compositions Comprising Cement Kiln Dust and Rice Husk Ash and Methods of Use

A method of cementing comprising:

• placing a settable composition into a subterranean formation, the settable composition comprising:
• cement kiln dust,
• rice husk ash, and
• water,
• wherein the cement kiln dust is present in an amount in a range of from about 50% to about 80% by weight of the cement kiln dust and the rice husk ash,
• wherein the rice husk ash is present in an amount in a range of from about 20% to about 50% by weight of the cement kiln dust and the rice husk ash,
• wherein the water is present in an amount in a range of from about 40% to about 200% by weight of the cement kiln dust and the rice husk ash,
• wherein the settable composition is essentially free of Portland cement;
• and
• allowing the settable composition to set.

A settable composition comprising:

• cement kiln dust;
• rice husk ash;
• and
• water.