Method of processing waste materials
AssigneeBlue Circle Industries Limited
InventorsGerald C. Bye, Kenneth B. Matthews
Life of this patent
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Abstract
A method of processing waste material comprises treating the material with flue dust and bonding it to form a solid mass with cement powder, e.g. Portland cement. Acidic liquors containing heavy metals can be processed. Suitable flue dust is obtained from cement manufacture.
Claims9
A method of processing a waste material that is an aqueous acidic liquor containing one or more heavy metals, which method comprises the steps of (1) adding to the waste material an amount of flue dust, obtained from the manufacture of cement, that is sufficient to bring the waste material to a pH of from 6 to 8, said flue dust comprising calcium carbonate and having a CaO analysis value of at least 17.7% by weight, (2) thereafter mixing the waste material with an amount of cement powder effective to bond the waste material and (3) allowing the resultant mixture to harden to a solid material.
Dependencies are inferred from the claim text.